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JP3758465B2 - Condenser, power plant equipment, and operation method thereof - Google Patents
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JP3758465B2 - Condenser, power plant equipment, and operation method thereof - Google Patents

Condenser, power plant equipment, and operation method thereof Download PDF

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JP3758465B2
JP3758465B2 JP2000144576A JP2000144576A JP3758465B2 JP 3758465 B2 JP3758465 B2 JP 3758465B2 JP 2000144576 A JP2000144576 A JP 2000144576A JP 2000144576 A JP2000144576 A JP 2000144576A JP 3758465 B2 JP3758465 B2 JP 3758465B2
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condensate
water
condenser
steam
supply system
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JP2001032701A (en
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直樹 甲谷
寿洋 大友
充 数藤
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Hitachi Ltd
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Hitachi Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、復水器，発電プラント設備、及びその運転方法に関する。
【０００２】
【従来の技術】
火力発電プラント或いは原子力発電プラント等では、蒸気タービンから排出される蒸気は、海水を冷却水に用いた復水器によって冷却されている。しかし、前述したように復水器では冷却水として海水を用いているため、復水器内に海水が流入した場合には発電プラントの構成機器や配管等の腐食等の原因になってしまうので、復水器内に海水が漏洩していないかどうか系統内の水質を常に監視する必要がある。もし、海水が復水器内に漏洩することによって系統内の水質が定められた設定値を超えた場合には検出部から信号が発信され、モニターや操作盤等に警報が発生される。運転員は、この警報を受けて漏洩箇所及び漏洩の程度の特定を行い、その結果によりプラント運転を継続、又は停止するかどうか判断して手動にて操作を行っていた。
【０００３】
なお、従来の水質監視装置の一例としては、特開平3−248030 号公報，特開平6−11406号公報，特開平5−264393 号公報に記載のものが提案されている。
【０００４】
例えば、特開平3−248030 号公報には、復水器ホットウェルを隔壁により第１水室と第２水室とに分け、各水室ごとに電気伝導率測定装置を設け、２つの電気伝導率の差の絶対値が上限値内にあるかどうか監視するものについて記載されている。また、特開平6−11406号公報には、復水器から抜き出されガス透過性膜で脱気された試料液の伝導率と、復水ポンプより送出された循環水から採取され同じく脱気された試料液の伝導率とを比較して海水の混入を判別するものについて記載されている。また、特開平5−264393 号公報には、復水系配管の複数箇所の水質を検出し、夫々から漏洩を判定し、これから漏洩状態の総合診断を段階に別け表示するものについて記載されている。
【０００５】
【発明が解決しようとする課題】
しかし、特開平3−248030 号公報，特開平6−11406号公報、及び特開平5−264393号公報に記載のものは、全ての復水が通過する復水器出口、または復水器の復水を送水する復水ポンプの後流側、或いは復水器から蒸気発生器へ接続する配管に検出水を取り出す検出点を設けている。このように、検出点を復水器出口、または復水器の復水を送水する復水ポンプの後流側、或いは復水器から蒸気発生器へ接続する配管に設けたものでは海水漏洩の検出までに時間を要し、さらには漏洩検出後にプラントの停止や給水系統の閉止を行ったとしても、海水が混入した海水混入水は復水器から流出し、さらには復水ポンプによって送水されているので、海水混入水が蒸気発生器や蒸気タービンなどに流入してしまう可能性があった。
【０００６】
本発明の目的は、冷却水の漏洩を早期検出して海水漏洩等による海水混入水が蒸気発生器や蒸気タービンへ流入することを抑制する復水器，発電プラント設備およびその運転方法を提供することにある。
【０００７】
【課題を解決するための手段】
本発明は、以下の復水器を提供する。
【０００８】
すなわち、本発明の復水器は、タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、前記複数個の検出器及び／又は検出口から検出された水質検出値に基づいて、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記給水系統に設置し、前記制御弁より下流側の該給水系統に補給水を供給する補給水系統を備えたものである。
【０００９】
また、本発明の復水器は、タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、前記複数個の検出器及び／又は検出口から検出された水質の検出値に基づいて、前記給水系統に薬品希釈水を供給する薬注系統を備えたものである。
【００１０】
好ましくは、前記復水器は、前記検出器及び／又は検出口が、該復水凝縮部から復水が流入する復水滞留部の上流側から、該給水系統に復水を流出する復水滞留部の下流側に至る経路に離間して設置され、これら検出器及び／又は検出口から検出される夫々の水質の検出値を比較して、上流側の検出器及び／又は検出口で検出した水質の検出値が下流側の検出器及び／又は検出口で検出した水質の検出値より水質が低下した場合に海水漏洩を判断する判定手段を備えたものである。
【００１１】
本発明は、以下の発電プラント設備を提供する。
【００１２】
すなわち、本発明の発電プラント設備は、蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を凝縮して復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを備えた発電プラント設備において、前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、前記複数個の検出器及び／又は検出口から検出された検出値に基づいて、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記復水系統に設置し、前記制御弁より下流側の該給水系統に連通し補給水を供給する補給水系統を備えたものである。
【００１３】
また、本発明の発電プラント設備は、蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を凝縮して復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを備えた発電プラント設備において、前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、前記複数個の検出器及び／又は検出口から検出された水質の検出値に基づいて、前記給水系統に連通し薬品希釈水を供給する薬注系統を備えたものである。
【００１４】
好ましくは、前記発電プラント設備は、補給水が貯水された補給水タンクと、前記補給水タンクに貯水された補給水を前記復水器、或いは前記給水系統に供給する補給水供給装置とを備えたものである。
【００１５】
また、好ましくは、海水が混入した復水を中和する薬品希釈水を貯蔵する薬品貯蔵タンクと、前記薬品貯蔵タンクに貯蔵された薬品希釈水を前記復水器、或いは前記給水系統に供給する薬品希釈水供給装置とを備えたものである。
【００１６】
また、好ましくは、前記蒸気発生器へ供給される復水の流量を制御する制御弁より上流側に復水を給水系統外に排出する排出系統を備えたものである。
【００１７】
本発明は、以下の発電プラント設備の運転方法を提供する。
【００１８】
すなわち、本発明の発電プラント設備の運転方法は、蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを有する発電プラント設備の運転方法において、前記復水器内で凝縮した復水を滞留する復水滞留部の複数箇所で復水の水質を検出し、この複数の検出点で検出される水質の検出値に基づいて海水漏洩を判定し、海水漏洩と判定された場合に、前記給水系統に設置された制御弁を操作して前記復水器から前記給水系統に供給される復水の供給を調節し、更に、前記制御弁より下流側の該給水系統に連通した補給水系統から補給水を該給水系統に供給するものである。
【００１９】
また、本発明の発電プラント設備の運転方法は、蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを有する発電プラント設備の運転方法において、前記復水器内で凝縮した復水を滞留する復水滞留部の複数箇所で復水の水質を検出し、この複数の検出点で検出される水質の検出値に基づいて海水漏洩を判定し、海水漏洩が判定された場合に、前記給水系統に薬品希釈水を供給するものである。
【００２０】
好ましくは、前記発電プラント設備の運転方法は、海水漏洩と判定された場合、海水が混入した復水を復水器から蒸気発生器へ導く流路の途中で前記給水系統外に排出するものである。
【００２１】
また、好ましくは、前記復水器内で凝縮した復水が滞留する復水滞留部の上流側から、該給水系統に復水を流出する復水滞留部の下流側に至る経路の離間する位置にて復水の水質を夫々検出し、これら検出点から検出される夫々の水質の検出値を比較して、上流側の検出点で検出した水質の検出値が下流側の検出手段で検出した水質の検出値より水質が低下した場合に海水漏洩を判断するものである。
【００２２】
【発明の実施の形態】
図２は本発明の一実施例を示した発電プラントの系統構成図である。
【００２３】
本実施例の発電プラントは、大別してガスタービン系統，蒸気タービン系統，復水・給水系統及び、蒸気発生器系統で構成されている。
【００２４】
ガスタービン系統は、空気を圧縮する圧縮機１ａ，圧縮機１ａで圧縮された空気に燃料を混合させ燃焼させる燃焼器１ｂ，燃焼器１ｂで燃焼された燃焼ガスで駆動されるガスタービン１ｃで構成されている。
【００２５】
また、蒸気タービン系統は、高圧蒸気タービン２，中圧蒸気タービン３及び、低圧蒸気タービン４で構成されている。これら蒸気タービン系統には、後述する蒸気発生器系統によって加熱された蒸気が供給される。また、本実施例では、ガスタービン１，高圧蒸気タービン２，中圧蒸気タービン３及び低圧蒸気タービン４は一軸に駆動軸が形成されており、この駆動軸に接続された発電機５を駆動して電力を発生させている。
【００２６】
復水・給水系統は、低圧蒸気タービン４で仕事を終えた蒸気を冷却水、例えば海水との熱交換によって凝縮して復水する復水器６，復水器６によって凝縮された復水を排熱回収ボイラ系統へ供給する給水配管６ａで構成されている。ここで、復水器６で凝縮された復水は、復水器内の図示しないホットウェル部に溜まり、復水器下部から復水ポンプ１３へ送水され昇圧される。復水ポンプ１３で昇圧された復水は、復水止め弁２３，グランド蒸気復水器１４，給水止め弁１７を経由して、ボイラ給水ポンプ１５及び排熱回収ボイラ１６へ夫々供給される。また、系統の水が余った場合には、給水配管６ａに設けられた排出流量調節弁２０を制御して排出配管１９から系外に排出される。
【００２７】
さらに復水器６には、復水器６内に補助的に蒸気を供給して脱気を促進する補助蒸気供給配管２７と、復水器６に補給水を供給する補給水配管２２ａが接続されている。この補給水配管２２ａには、補給水供給弁２１ａ及び、補給水ポンプ２６を介して補給水タンク２８が接続されている。また補給水配管２２ａには、補給水ポンプ２６で送水される補給水を給水配管６ａに設置された給水止め弁１７の後流側に供給する補給水配管２２ｂが接続され、この補給水配管２２ｂには補給水供給弁２１ａが設置されている。
【００２８】
なお、図２に示す本実施例では給水配管６ａに供給する補給水は補給水タンク２８から導いているが、図２に示す発電プラントが複数設置されたものであれば、図示しない別の復水器６から給水配管６ａに復水を供給することが可能である。また、復水器６に復水室が複数形成されたものであれば、別の復水室の復水に切替えて復水を供給することも可能である。
【００２９】
また、給水配管６ａには薬品供給配管７３を介して薬品又は薬品希釈水が貯蔵された薬品貯蔵タンク７０が接続されている。この薬品供給配管７３には薬品希釈水を送水する薬品移送ポンプ７１と、薬品希釈水の流量を調節する流量調節弁７２が設置されている。なお、図２に示す本実施例においては、薬品希釈水の注入点を給水止め弁１７の後流側に設置しているが、給水止め弁１７より上流側の給水配管６ａ、或いは排熱回収ボイラ１６のボイラドラムに注入することも可能である。
【００３０】
蒸気発生器系統である排熱回収ボイラ１６では、ガスタービン１から排出される高温の排熱を利用して蒸気が発生される。ボイラ給水ポンプ１５によって供給される復水は、排熱回収ボイラ１６で加熱されて蒸気となり、ここで発生した蒸気は主蒸気配管９を流れて高圧蒸気タービン２に流入する。また、高圧蒸気タービン２から排出される蒸気は、高圧タービン排気配管１８を流れて中圧蒸気と混合され、排熱回収ボイラ１６の再熱器１８ａで再び加熱される。再熱器１８ａで再加熱された蒸気は、再熱蒸気配管７を流れて中圧蒸気タービン３に供給される。また一方で、中圧蒸気タービン３には排熱回収ボイラ１６で加熱された低圧蒸気が低圧蒸気配管８によって供給される。再熱蒸気配管７及び低圧蒸気配管８によって中圧蒸気タービン３に供給された蒸気は混合されて低圧蒸気となり、さらに低圧蒸気タービン４へと供給される。また、再熱蒸気配管７，低圧蒸気配管８及び、主蒸気配管９には、高圧タービンバイパス配管１１，中圧タービンバイパス配管１０及び、低圧タービンバイパス配管１２が各々接続されており、これらのバイパス配管によって排熱回収ボイラ１６で発生した蒸気は復水器６に供給される。
【００３１】
次に、図２に示す復水器６の具体的な一実施例について図１を用いて説明する。蒸気タービンから排気される蒸気３５は、復水器６の上方から復水器胴体３１の内部に流入する。復水器胴体３１に流入した蒸気３５は冷却水、例えば海水が内部を流れる伝熱管の管巣２９の間を通過することにより熱交換が行われる。熱交換された蒸気３５は、凝縮されて復水４４となり復水滞留部(ホットウェル部)４１に滴下する。滴下した復水４４は復水滞留部４１に滞留し、復水器出口３６に向かって傾斜した底面を流れ復水器６の外部へ導かれる。
【００３２】
また、本実施例に示す復水器は、復水４４が滴下する復水滞留部４１に、検出水取出口３３，３９，４５が複数設けられた構造となっている。検出水取出口３３は、管巣２９の直下の位置、または滴下して最初に滞留する箇所、或いはその近傍に設置される。すなわち、蒸気の熱交換を行う管巣２９の真下部、或いはその近傍に設置することが好ましい。また、検出水取出口３９は復水滞留部４１に滞留した復水４４が排出される復水器出口３６、或いはその近傍に設置される。また、検出水取出口４５は管巣２９の直下の位置に設置される検出水取出口３３と、復水４４が排出される復水器出口３６、或いはその近傍に設置される検出水取出口３９との略中間位置、或いは復水滞留部４１に滞留した復水４４が復水器出口３６へ向かって流れる途中位置に設置される。検出水取出口３３，３９，４５で検出された検出水は図示しない検査装置にて水質検査が行われる。なお、図１に示すものにおいては、復水滞留部４１のコーナー部にも検出水取出口４５を配置している。
【００３３】
このように本実施例では、復水滞留部４１の上流位置と下流位置、さらには復水滞留部４１の上流側から下流側に向かって流れる流路の略中間位置、或いは流路の途中位置にて復水４４の水質検査を行っている。すなわち、管巣２９で凝縮された復水が流入する復水滞留部４１の上流側から、給水系統に復水を流出する復水滞留部４１の下流側に至る経路に離間して検出水取出口を設置している。尚、図１に示す検出水取出口３３，３９，４５で取水された検出水（復水）は、夫々の検出水取水口に接続された配管を介して図示しない水質測定器に導かれ、そこで前述した複数の検出水取水口で採取された夫々の検出水の水質検査が行われる。なお、復水器（復水滞留部４１）内に検出器を設置して水質の監視を直接行うこともできるが、復水滞留部４１に滞留する復水の温度や流量の状態が一定ではないため、水質検出の際にこれらの状態変化の影響を受けてしまう虞がある。そこで、本実施例では検出水取出口から検出水を採取することにより、復水の測定条件を一定に近づけるようにして、より正確に、安定した海水漏洩の検出を行うことを可能としている。なお、海水漏洩の検出方法の詳細については後述する。
【００３４】
以上のように本実施例によれば、検出水取出口３３は管巣２９の直下の位置に設置しているので、海水が漏洩した場合には復水が滴下した直後に海水混入水が検出される。従って、海水が混入した復水が蒸気発生器や蒸気タービン等の他のプラント構成機器へ供給されるまでに復水の供給を停止させる等の防止策をとるための時間的余裕を長く取ることができる。また、復水器出口３６近傍に設置される検出水取出口３９で検出される検出値は、管巣２９の真下部で検出される検出値に比べて時間遅れをもって検知される。
【００３５】
尚、図１では復水の水質を検出する手段として検出水取出口３３，３９，４５を復水滞留部４１に設置した例を図示しているが、海水漏洩を検出することが可能な検出器を設置することも可能である。その際には、図１に図示する検出水取出口３３，３９，４５と同じ、或いはその近傍箇所に検出器を設置することが望ましい。また、検出水取水口と検出器を組み合わせて設置することも可能である。
【００３６】
次に、本実施例における海水漏洩の検出方法について図３を用いて説明する。図３は、導電率及び導電率差の特性例を示した図である。図中Ａはプラント起動運転時、Ｂは通常運転時、Ｃは海水漏洩時の導電率特性を示している。なお、本実施例では水質検査に導電率検出器を用い、また、検出水取出口を復水滞留部の上流側である管巣２９の直下の位置と、下流側である復水器出口３６の位置に各々設置した例である。
【００３７】
蒸気タービンを有する発電プラントにおいては、起動時等に溶存炭酸ガスや不純物の影響により系統全体の導電率が大きく変化する場合がある。即ち、起動時等にはＡに示すように、起動時等には溶存炭酸ガスを多く含んでいるため導電率が高くなる一方、通常運転中にはＢに示すように導電率が低くなる。そのため導電率の絶対値だけを監視していた場合、導電率の上昇の原因が、起動などによるものか、冷却水例えば海水の漏洩によるものかを特定できないため、運転の状況に応じて警報を発生させる制限値を切り替える操作が必要であった。また、海水漏洩の検出までに時間を要するために、漏洩検出後にプラントの停止や給水系統の閉止を行ったとしても、海水が混入した海水混入水は復水器から流出しているので、海水混入水が蒸気発生器や蒸気タービンなどに流入してしまう可能性があった。
【００３８】
これに対して、本実施例では前述したように、検出水取出口を復水滞留部の上流側と復水下流側に各々設置し、２箇所の検出器の導電率の差を監視している。以上のように構成することにより、例えばＡのプラント起動運転時、またはＢの通常運転時に示す２箇所の導電率の差の特性に着目すると、変化の特性は、元々の導電率の大きさに関係なく同じとなる。
【００３９】
ここで、Ｃに図示するように海水の漏洩が発生した場合には、海水が混入した海水混入水は上流の検出器で検知された後、時間遅れをもって下流の検出器で検知される。そのため、海水混入水が下流側の検出器に到達するまでは、上流側の検出器の指示値と下流側の指示値が大きく異なり、導電率の差は大きくなる。よって、２箇所の検出点の導電率差を監視することにより、海水漏洩を早期検出することが可能となり、また運転状態によって警報の制限値を設定し直すことなく冷却水例えば海水の漏洩のみを精度良く検出することが可能となる。
【００４０】
また、２箇所の検出点の導電率差の変化の程度によって漏洩が大規模であるか小規模であるか判定することができる。即ち、導電率差が時間経過に対して急速に増加した場合、或いは伝導率差があらかじめ設定された制限値を超えた場合には大規模な漏洩が発生したと判定する。また、導電率差が緩やかに増加した場合、或いは伝導率差があらかじめ設定された制限値よりも小さいが、一定時間経過しても検出される伝導率の値が低下しない場合には小規模の漏洩と判定する。
【００４１】
ここで、漏洩が大規模と判定された場合にはプラント運転を停止または安全と判断される負荷まで負荷降下させ、冷却水例えば海水が混入した復水がタービン等に流入しないよう系統を隔離する。また、漏洩が小規模と判定された場合には、海水混入水を中和するための薬品または薬品希釈水を注入させる。
【００４２】
以下、海水漏洩時のプラントの運転方法について図４を用いて説明する。図４は、海水漏洩時のプラントの運転方法の詳細を示したフロー図である。
【００４３】
通常、復水器滞留部の上流側と下流側にて復水器内部の水質検査を行う(101)。そして、上流側或いは下流側の検出点から検出される検出値が、予め設定された設定値より高くないかどうかの判定を行い（１０２）、上流側及び下流側の検出点で検出した何れの検出値も設定値より低い場合は、海水の漏洩はないものと判定される（１０３）。ここで、復水器内部に設置された上流側検出器のうち、少なくとも１箇所以上で検出された検出値が予め設定された設定値よりも高い値を示した場合には、下流側の検出点で検出された検出値と比較される（１０４）。そして、下流側の検出器で検出された検出値との差が予め設定された設定値よりも大きい場合には、復水器内部で大規模な海水漏洩が発生したと判定する（１０５）。この場合、海水を含んだ復水が蒸気発生器や蒸気タービン等に流入することを抑制するために、早急に海水を含んだ復水の蒸気発生器等への供給を停止する必要がある。そのため、図４に示すように、海水漏洩の信号を受けて自動的に海水混入水の蒸気発生器等への流入防止策（１０６）を行う。
【００４４】
その一例として、蒸気発生器の上流に設置された給水止め弁１７を閉止し、復水器から流れてくる海水混入水が下流に流れるのを防止する。また、給水が停止することによって蒸気発生器が空焚きとなるのを防止するため、補給水タンクに貯水された補給水を補給水ポンプにより給水配管に供給する。ここで、補給水の供給により水が余剰となった場合には、制御装置にてスピルオーバー系統の排出配管に設置された排出流量調節弁を開方向に制御して余剰水を排出する(１０７)。また、別の一例として、蒸気発生器の上流に設置された復水止め弁を閉止し、復水器から流れてくる海水混入水が下流に流れるのを抑制する。また、復水が停止することによって蒸気発生器が空焚きとなるのを防止するため、補給水タンクに貯水された補給水を補給水ポンプにより給水配管に供給する。ここで、補給水の供給により水が余剰となった場合には、制御装置にてスピルオーバー系統の排出配管に設置された流量調節弁を開方向に制御して余剰水を排出する（１０８）。これらの動作によりプラント機器を保護しつつ、漏洩の影響が及ばない安全な負荷までの負荷降下、またはプラント停止を行うことができる（１０９）。
【００４５】
また、図４において、復水器内部に設置された上流側検出器のうち少なくとも１箇所以上で予め設定された設定値よりも高い値を示しているときであっても、下流側検出器との差が予め設定された設定値よりも小さい場合（１１０）には、起動時の一時的な導電率の上昇か、または導電率が急激に上昇しない程度の小規模な海水漏洩が発生していることが考えられる。この場合、検出される値が運転を続けても減少しない場合には、復水器内部で冷却水例えば海水が小規模で漏洩していると判定される（１１１）。小規模漏洩の場合には、早急に漏洩箇所の隔離やプラント負荷降下またはプラント停止を行う必要はないため、海水混入水が蒸気発生器等へ流入する際の影響を緩和する為の対策がとられる（１１２）。この影響緩和策としては、例えば海水混入水を中和するための薬品または薬品希釈水を注入することで、応急的な処置が行われる（１１３）。また、この影響緩和策を実施した後も、プラントの停止または負荷を降下させることが必要かどうか、継続した水質の監視が行われる（１１４）。すなわち、薬品や薬品希釈水の注入だけでは十分ではないと判断された場合には、プラント負荷降下やプラント停止の操作が行われ（１０９）、プラント停止や負荷降下の必要はないと判断された場合には、プラントの運転は継続されることになる（１１６）。なお、注入する薬品または薬品希釈水の一例としては、リン酸ソーダ等が一般に使用される。
【００４６】
また、復水器内部に設置された上流側検出器のうち少なくとも１箇所以上で予め設定された設定値よりも高い値を示していて、下流側検出器との差が予め設定された設定値よりも小さく、導電率の検出値が運転時間とともに減少する場合には、起動時等の一時的な導電率上昇と判断し（１１５）、プラントの運転は継続される（１１６）。
【００４７】
次に、本実施例の発電プラントの制御方法について、図５を用いて説明する。図５は、図２に示した系統構成図を簡略化したものであり、図２と同一のものについては説明を省略する。
【００４８】
復水器６の図示しないホットウェル入口及び出口には、前述したように検出水取出口が設けられ、配管を介して取り出された水は検出部６５，５５にて水質が監視される。また、復水器６には水位計６６が設けられ、復水滞留部に滞留する復水の水位が検出される。検出部６５，５５および水位計６６で検出された情報は制御装置６４に伝達される。制御装置６４は、この伝達された情報を基に、給水止め弁１７，補給水供給弁２１ｂ及び、排出流量調節弁２０の開閉制御を行う。
【００４９】
本実施例では、復水の検出を検出部６５，５５で行っており、検出値の変化を制御装置６４で検知して漏洩の程度を判断している。もしここで復水器６の内部で海水の漏洩が発生した場合には、海水混入水が蒸気タービン等のプラント機器に流入することを抑制して、速やかに漏洩箇所を隔離する必要がある。もし、検出結果より漏洩の程度が大規模であると判定された場合には、蒸気発生器６０の上流に設置された給水止め弁１７が閉止され、復水器６から流れてくる海水混入水が下流に流れるのを抑制する。また、給水が停止することによって蒸気発生器６０が空焚きとなるのを防止するため、補給水タンク２８に貯水された補給水を補給水ポンプ２６により給水配管６ａに供給される。ここで、補給水の供給により水が余剰となった場合には、制御装置６４にてスピルオーバー系統の排出配管１９に設置された排出流量調節弁２０を開方向に制御して、余剰水が排出される。
【００５０】
以上述べたように、本実施例によれば、海水漏洩が大規模な場合に海水が蒸気タービン等に流入することを抑制するため、漏洩の検知信号を受けると、制御装置６４は、給水止め弁１７を閉止し、給水止め弁１７の下流側に補給水を補給し、補給水の供給により余剰となる水を系外に排出させることにより、冷却水が混入した復水が復水器下流に流出して蒸気発生器６０を経由し蒸気タービン５１に流入することを運転員の判断に依らず、早期に且つ高い信頼性で抑制することができる。さらに、本実施例によれば、プラントを緊急停止させることなく、プラント機器に漏洩の影響が及ばない安全な負荷までの負荷降下を行うことができる。
【００５１】
図６は、本発明の他の実施例を示す発電プラントの系統構成図である。図６は、図２に示した系統構成図を簡略化したものであり、図２と同一の構成については説明を省略する。
【００５２】
本実施例では、薬品又は薬品希釈水が貯蔵された薬品貯蔵タンク７０，薬品又は薬品希釈水を蒸気発生器６０に導く薬品供給配管７３，薬品供給配管７３に設置され薬品又は薬品希釈水を蒸気発生器６０に送水する薬品移送ポンプ７１，蒸気発生器６０に供給する薬品又は薬品希釈水の流量を調節する流量調節弁７２が設けられている。
【００５３】
また、復水器６の図示しない復水滞留部の管巣の真下部及び復水器出口には、前述したように検出水取出口が設けられ、配管を介して取り出された水は検出部６５，５５にて水質が監視される。検出部６５，５５で検出された情報は制御装置６４に伝達される。制御装置６４は、この伝達された情報を基に、薬品移送ポンプ７１及び流量調節弁７２の制御を行う。
【００５４】
本実施例では、復水の水質監視を検出部６５，５５で行っており、検出値の変化を制御装置６４で検知して漏洩の程度を判断している。もしここで復水器６の内部で冷却水、例えば海水の漏洩が発生して、検出結果より漏洩の程度が小規模であると判定された場合には、プラント運転を継続しつつ、薬品貯蔵タンク７０内の薬品又は薬品希釈水を薬品移送ポンプ７１で給水配管６ａに供給を行い、その後プラントを手動にて停止させる。
【００５５】
本実施例では、冷却水漏洩が小規模で、直ちに復水器６からの復水の流出を停止させる必要はないが漏洩への対応が必要な場合に、海水が混入した復水による蒸気タービンへの影響を緩和する薬品又は薬品希釈水を制御装置６４からの信号により注入量を制御しながら注入を行うものである。以上のように制御することで、プラントを緊急停止させることなく、プラント機器に漏洩の影響が及ばない安全な負荷までの負荷降下を行うことができる。
【００５６】
図７は、図１に示す復水器の変形例を示す図である。本実施例では、復水器内を構造体３０、例えば天板によって蒸気凝縮部４０と復水滞留部４１に区画した構造としている。
【００５７】
蒸気タービンから排気される蒸気３５は、復水器６の上方から復水器胴体３１内部の蒸気凝縮部４０に流入される。流入した蒸気３５は冷却水、例えば海水が内部を流れる管巣２９の間を通過することにより熱交換が行われる。熱交換された蒸気３５は、凝縮されて復水となり管巣２９から構造体３０へ滴下する。構造体３０上に滴下した復水は構造体３０上を流れて、構造体３０の一角に設けられた連絡部３４によって復水滞留部４１へと導入される。復水滞留部４１に導入された復水は復水滞留部４１内を流れて、復水器出口３６から外部へ排出される。なお、蒸気凝縮部４０と復水滞留部４１を連絡する連絡部３４は、復水滞留部４１内部での水の流れに対して復水器出口３６から最も遠い箇所に復水が流入するように形成している。
【００５８】
また、復水滞留部４１には復水の水質を監視するための検出水取出口３３を連絡部３４の真下部、或いはその近傍に、すなわち復水滞留部４１の最上流部に配置している。また、検出水取出口３９は復水滞留部４１に滞留した復水４４が排出される復水器出口３６、或いはその近傍に、すなわち復水滞留部４１の最下流部に設置している。また、検出水取出口４５は復水４４が復水滞留部４１に流入する箇所、またはその近傍に設置される検出水取出口３３と、復水滞留部４１に滞留した復水４４が排出される復水器出口３６、或いはその近傍に設置される検出水取出口３９との略中間位置、または復水滞留部４１に流入した復水４４が復水器出口３６へ向かって流れる流路の途中位置に設置している。
【００５９】
本実施例によれば、冷却水例えば海水の漏洩が発生しても、検出水取出口３３によって復水滞留部４１に海水混入水が流入した直後に漏洩を検知することができる。従って、海水が混入した復水が蒸気発生器や蒸気タービン等の他のプラント構成機器へ供給されるまでに、復水の供給を停止させる等の防止策をとるための時間的余裕を長く取ることができる。このように、２箇所の検出点の導電率差を監視することにより、海水漏洩を早期検出することが可能となり、また運転状態によって警報の制限値を設定し直すことなく海水の漏洩が大規模であるか小規模であるか確実に判定することができる。なお、海水漏洩と判定された場合には、前述した図４に示すフロー図と同様に海水漏洩の規模によってその防止策が選択される。
【００６０】
図８は、図１に示す復水器の変形例を示す図である。本実施例に示す復水器６は、蒸気凝縮部４０と復水滞留部４１とがそれぞれ独立した筐体で構成されたものである。
【００６１】
蒸気タービンから排気される蒸気３５は、復水器６の上方から復水器胴体３１内部の蒸気凝縮部４０に流入される。流入した蒸気３５は冷却水、例えば海水が内部を流れる管巣２９の間を通過することにより熱交換が行われる。熱交換された蒸気３５は、凝縮されて復水となり管巣２９から筐体の蒸気凝縮部４０の底部へ滴下する。蒸気凝縮部４０の底部へ滴下した復水は、その一角に形成された連絡部４２から筐体の復水滞留部４１へと導入される。復水滞留部４１に導入された復水は復水器出口３６から外部へ排出される。なお、蒸気凝縮部４０と復水滞留部４１を連絡する連絡部４２は、復水滞留部４１内部での水の流れに対して復水器出口３６から最も遠い箇所に復水が流入するように形成している。
【００６２】
また、復水滞留部４１には復水の水質を監視するための検出水取出口３３を連絡部４２の真下部、或いはその近傍に、すなわち復水滞留部４１の最上流部に配置している。また、検出水取出口３９は復水滞留部４１に滞留した復水４４が排出される復水器出口３６、或いはその近傍に、すなわち復水滞留部４１の最下流部に設置している。また、検出水取出口４５は復水４４が復水滞留部４１に流入する箇所、またはその近傍に設置される検出水取出口３３と、復水滞留部４１に滞留した復水４４が排出される復水器出口３６、或いはその近傍に設置される検出水取出口３９との略中間位置、または復水滞留部４１に流入した復水４４が復水器出口３６へ向かって流れる流路の途中位置に設置している。
【００６３】
以上のように本実施例によれば、冷却水例えば海水の漏洩が発生しても、検出水取出口３３によって復水滞留部４１に海水混入水が流入した直後に漏洩を検知することができる。また、復水滞留部４１例えばホットウェル内の復水の最上流部に検出水取出口３３を設置することにより、従って、海水が混入した復水が蒸気発生器や蒸気タービン等の他のプラント構成機器へ供給されるまでに復水の供給を停止させる等の防止策をとるための時間的余裕を長く取ることができる。
【００６４】
さらに本実施例では、復水滞留部４１の最上流部と最下流部、さらにその中間部の複数箇所に検出点を設けており、その各々の導電率差の変化の程度を見ることによって漏洩が大規模であるか小規模であるか確実に判定することができる。よって、２箇所の検出点の導電率差を監視することにより、海水漏洩を早期検出することが可能となり、また運転状態によって警報の制限値を設定し直すことなく海水の漏洩のみを精度よく検出することが可能となる。なお、海水漏洩と判定された場合には、前述した図４に示すフロー図と同様に海水漏洩の規模によってその防止策が選択される。
【００６５】
図９は、図１に示す復水器の変形例を示す図である。本実施例に示す復水器６は、それぞれ独立した筐体である蒸気凝縮部４０と復水滞留部４１が隣り合わせの位置に配置した構成としたものである。
【００６６】
先に述べたものと同様に、復水器６に流入した蒸気３５は熱交換によって凝縮され復水し、筐体の蒸気凝縮部４０の底部へ滴下する。蒸気凝縮部４０の底部へ滴下した復水は、その一角に形成された連絡部４２から筐体の復水滞留部４１へと導入される。復水滞留部４１に導入された復水は復水器出口３６から外部へ排出される。なお、蒸気凝縮部４０から復水滞留部４１へ連絡する連絡部４２の出口は、復水滞留部４１内部での水の流れに対して復水器出口３６から最も遠い箇所に復水が流入するように形成している。
【００６７】
また、復水滞留部４１には復水の水質を監視するための検出水取出口３３を連絡部４２の近傍に、すなわち復水滞留部４１の最上流部に配置している。また、検出水取出口３９は復水滞留部４１に滞留した復水４４が排出される復水器出口３６、或いはその近傍に、すなわち復水滞留部４１の最下流部に設置している。
【００６８】
また、特に図示していないが、検出水取出口３３と検出水取出口３９との略中間位置、または復水滞留部４１に流入した復水４４が復水器出口３６へ向かって流れる流路の途中位置に検出水取出口４５を設置することも可能である。
【００６９】
以上のように本実施例によれば、冷却水例えば海水の漏洩が発生しても、検出水取出口３３によって復水滞留部４１に海水混入水が流入した直後に漏洩を検知することができる。また、復水滞留部４１例えば復水滞留部４１の最上流部に検出水取出口３３を設置することにより、海水が混入した復水が蒸気発生器や蒸気タービン等の他のプラント構成機器へ供給されるまでに復水の供給を停止させる等の防止策をとるための時間的余裕を長く取ることができる。
【００７０】
さらに本実施例では、復水滞留部４１の最上流部と最下流部、さらにその中間部といった複数箇所に検出点を設けており、その各々の導電率差の変化の程度を見ることによって漏洩が大規模であるか小規模であるか確実に判定することができる。よって、２箇所の検出点の導電率差を監視することにより、海水漏洩を早期検出することが可能となり、また運転状態によって警報の制限値を設定し直すことなく海水の漏洩のみを精度よく検出することが可能となる。なお、海水漏洩と判定された場合には、前述した図４に示すフロー図と同様に海水漏洩の規模によってその防止策が選択される。
【００７１】
図１０は、図１に示す復水器の変形例を示す図である。
【００７２】
本実施例では、復水器６内を天板４３にて蒸気凝縮部４０と復水滞留部４１に区画し、さらに復水滞留部４１内を仕切り板３７で区切り隘路を形成した構造としている。また、復水器６内には復水滞留部４１の復水に蒸気を噴射する脱気蒸気噴射管３２が設けられ、噴射する蒸気は脱気蒸気噴射管３２と接続された脱気蒸気管３８から復水器の内部に導かれる。
【００７３】
蒸気タービンから排気される蒸気３５は、復水器６の上方から復水器胴体３１内部の蒸気凝縮部４０に流入される。流入した蒸気３５は冷却水、例えば海水が内部を流れる管巣２９の間を通過することにより熱交換が行われる。熱交換された蒸気３５は、凝縮されて復水となり管巣２９から天板４３へ滴下する。天板４３上に滴下した復水は天板４３上を流れて、天板４３の一角に設けられた連絡部３４によって復水滞留部４１へと導入される。復水滞留部４１に導入された復水は、仕切り板３７によって形成された隘路に沿って流れて、復水器出口３６から外部へ排出される。なお、蒸気凝縮部４０と復水滞留部４１を連絡する連絡部３４は、復水滞留部４１内部での水の流れに対して復水器出口３６から最も遠い箇所に復水が流入するように形成している。
【００７４】
また、復水滞留部４１には復水の水質を監視するための検出水取出口３３を連絡部３４の真下部、或いはその近傍に、すなわち復水滞留部４１の最上流部に配置している。また、検出水取出口３９は復水滞留部４１に滞留した復水４４が排出される復水器出口３６、或いはその近傍に、すなわち復水滞留部４１の最下流部に設置している。
【００７５】
また、特に図示していないが、検出水取出口３３と検出水取出口３９との略中間位置、または復水滞留部４１に流入した復水４４が復水器出口３６へ向かって流れる流路の途中位置に検出水取出口４５を設置することも可能である。
【００７６】
また、本実施例では、起動時などで復水の脱気が必要な場合には、脱気蒸気管３８で蒸気を復水器の内部に導き、ホットウェル内部の復水に水没している脱気蒸気噴射管３２より蒸気を復水内に噴射し脱気を促している。
【００７７】
以上のように本実施例によれば、ホットウェルの上部、すなわち復水滞留部４１を広く天板４３で覆って、復水滞留部４１を仕切り板３７で区切って隘路を形成し、復水が隘路に沿って流れるようにしているので、海水の漏洩が発生したとしても、復水器ホットウェルから系統内へ海水が混入した復水が出ていくまで、即ち、海水が混入した復水が蒸気発生器や蒸気タービン等の他のプラント構成機器へ供給されるまでに復水の供給を停止させる等の防止策をとるための時間的余裕を長く取ることができる。また、海水の漏洩が発生した場合でも、復水滞留部４１例えばホットウェル内の復水の最上流部に検出水取出口３３を設置しているので、復水滞留部４１に海水混入水が流入した直後に漏洩を検出することができる。
【００７８】
よって、２箇所の検出点の導電率差を監視することにより、海水漏洩を早期検出することが可能となり、また運転状態によって警報の制限値を設定し直すことなく冷却水例えば海水の漏洩のみを精度よく検出することが可能となる。なお、海水漏洩と判定された場合には、前述した図４に示すフロー図と同様に海水漏洩の規模によってその防止策が選択される。
【００７９】
図１０は、本発明の他の実施例を示した発電プラントの系統構成図である。なお、図２と同一の構成については説明を省略する。
【００８０】
本実施例では、補給水を導く補給水配管２２ｂを給水止め弁２３の下流側、すなわちグランド蒸気復水器１４の上流側へ接続した構成となっている。また、復水ポンプ１３の後流には、排水流量調節弁２４を介して排水配管２５が設置されている。
【００８１】
以上のように構成されたものにおいて、復水器６内部で冷却水である海水が漏洩した場合、排熱回収ボイラ１６や高圧蒸気タービン２，中圧蒸気タービン３及び低圧蒸気タービン４などに流入することを抑制するために、まず始めに復水ポンプ１３出口に設置された復水止め弁２３を閉止して、復水器６から流れてくる海水が混入した復水が下流に流れるのを抑制して漏洩箇所を隔離する。次に、排熱回収ボイラ１６に必要な給水量を確保するため、補給水配管２２ｂに設置された補給水供給弁２１ｂを制御し、補給水を復水止め弁２３の下流側に供給する。また、補給水の補給によって余剰となった内部保有水は、復水ポンプ１３下流側に接続された排水配管２５を介し、排水流量調節弁２４を調節して系外に排出される。
【００８２】
図１２は、図１１に示した系統構成図を簡略化したものである。
【００８３】
復水器６の図示しない復水滞留部の管巣の直下の位置、及び復水器出口の位置には、前述したように検出水取出口が設けられ、配管を介して取り出された水は検出部６５，５５にて水質が監視される。また、復水器６には水位計６６が設けられ、ホットウェルに滞留する復水の水位が検出される。検出部６５，５５および水位計６６で検出された情報は制御装置６４に伝達される。制御装置６４は、この伝達された情報を基に、復水止め弁２３，補給水供給弁２１ｂ及び、排水流量調節弁２４の開閉制御を行う。
【００８４】
本実施例では、復水の水質監視を検出部６５，５５で行っており、検出値の変化を制御装置６４で検知して漏洩の程度を判断している。もしここで復水器６の内部で冷却水、例えば海水の漏洩が発生した場合には、海水混入水が蒸気タービン等のプラント機器に流入することを抑制して、速やかに漏洩箇所を隔離する必要がある。もし検出結果より漏洩の程度が大規模であると判定された場合には、復水ポンプ１３の下流に設置された復水止め弁２３が閉止され、復水器６から流れてくる海水混入水が下流に流れるのを抑制する。また、給水が停止することによって蒸気発生器６０が空焚きとなるのを防止するため、補給水タンク２８に貯水された補給水を補給水ポンプ２６により給水配管６ａに供給される。ここで、補給水の供給により水が余剰となった場合には、制御装置６４にて排水配管２５に設置された排水流量調節弁２４を開方向に制御して、余剰水が排出される。
【００８５】
以上述べたように、本実施例によれば、海水漏洩が大規模な場合に海水がプラント機器に流入することを抑制するため、漏洩の検知信号を受けると制御装置６４は、復水止め弁２３を閉止し、復水止め弁２３の下流側に補給水を補給し、補給水の供給により余剰となる水を復水ポンプ１３の下流側から系外に排出させることにより、冷却水が混入した復水が復水器下流に流出して蒸気発生器６０を経由し蒸気タービン５１などに流入することを運転員の判断に依らず早期に且つ高い信頼性で抑制することができる。さらに、本実施例によれば、プラントを緊急停止させることなく、プラント機器に漏洩の影響が及ばない安全な負荷までの負荷降下を行うことができる。
【００８６】
なお、海水漏洩が小規模と判断された場合は、プラント運転を継続しつつ、図示しない薬品貯蔵タンク内の薬品又は薬品希釈水を給水配管６ａに供給を行いその後プラントを手動にて停止させる。以上のように制御することで、プラントを緊急停止させることなく、プラント機器に漏洩の影響が及ばない安全な負荷までの負荷降下を行うことができる。
【００８７】
【発明の効果】
本発明によれば、冷却水の漏洩を早期検出して海水漏洩等による海水混入水が蒸気発生器や蒸気タービンへ流入することを抑制できるという効果を奏する。
【図面の簡単な説明】
【図１】本発明の一実施例の復水器の構造図である。
【図２】本発明の一実施例を示した発電プラントの系統構成図である。
【図３】導電率及び導電率差の特性例を示した図である。
【図４】本発明の一実施例である発電プラントの運転方法のフロー図である。
【図５】図２に示す発電プラントの系統構成図である。
【図６】図２に示す発電プラントの系統構成図である。
【図７】図１に示す復水器の変形例を示す図である。
【図８】図１に示す復水器の変形例を示す図である。
【図９】図１に示す復水器の変形例を示す図である。
【図１０】図１に示す復水器の変形例を示す図である。
【図１１】本発明の他の実施例を示した発電プラントの系統構成図である。
【図１２】図１１に示す発電プラントの系統構成図である。
【符号の説明】
１…ガスタービン、２…高圧蒸気タービン、３…中圧蒸気タービン、４…低圧蒸気タービン、５…発電機、６…復水器、６ａ…給水配管、７…再熱蒸気配管、８…低圧蒸気配管、９…主蒸気配管、１０…中圧タービンバイパス配管、１１…高圧タービンバイパス配管、１２…低圧タービンバイパス配管、１３…復水ポンプ、１４…グランド蒸気復水器、１５…ボイラ給水ポンプ、１６…排熱回収ボイラ、１７…給水止め弁、１８…高圧タービン排気配管、１８ａ…再熱器、１９…排出配管、２０…排出流量調節弁、２１ａ，２１ｂ…補給水供給弁、２２ａ，２２ｂ…補給水配管、２３…復水止め弁、２４…排水流量調節弁、２５…排水配管、２６…補給水ポンプ、２７…補助蒸気供給配管、２８…補給水タンク、２９…管巣、３０…構造体、３１…復水器胴体、３２…脱気蒸気噴射管、３３…検出水取出口、３４…連絡部、３５…蒸気、３６…復水器出口、３７…仕切り板、３８…脱気蒸気管、３９…検出水取出口、４０…蒸気凝縮部、４１…復水滞留部、４２…連絡部、４３…天板、４４…復水、４５…検出水取出口、５１…蒸気タービン、５５，６５…検出部、５９…給水ポンプ、６０…蒸気発生器、６４…制御装置、６６…水位計、６８…排出配管、６９，７２…流量調節弁、７０…薬品貯蔵タンク、７１…薬品移送ポンプ、７３…薬品供給配管。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a condenser, a power plant facility, and an operation method thereof.
[0002]
[Prior art]
In a thermal power plant or a nuclear power plant, steam discharged from a steam turbine is cooled by a condenser using seawater as cooling water. However, as mentioned above, since the condenser uses seawater as the cooling water, if seawater flows into the condenser, it may cause corrosion of the components and piping of the power plant. It is necessary to constantly monitor the water quality in the system for seawater leaking into the condenser. If seawater leaks into the condenser and the water quality in the system exceeds a predetermined set value, a signal is transmitted from the detection unit, and an alarm is generated on the monitor, operation panel, and the like. Upon receiving this warning, the operator specified the leak location and the extent of the leak, and based on the result, judged whether to continue or stop the plant operation and manually operated it.
[0003]
As examples of conventional water quality monitoring devices, those described in JP-A-3-248030, JP-A-6-11406, and JP-A-5-264393 have been proposed.
[0004]
For example, in Japanese Patent Laid-Open No. 3-248030, a condenser hot well is divided into a first water chamber and a second water chamber by a partition, and an electric conductivity measuring device is provided for each water chamber to provide two electric conductions. It describes what monitors whether the absolute value of the rate difference is within the upper limit. Japanese Patent Laid-Open No. 6-11406 discloses the conductivity of the sample liquid extracted from the condenser and degassed by the gas permeable membrane, and the same degassing sampled from the circulating water sent from the condensate pump. It describes what determines the mixing of seawater by comparing the conductivity of the sample solution. Japanese Patent Application Laid-Open No. 5-264393 discloses a technique for detecting water quality at a plurality of locations in a condensate system pipe, determining leakage from each of them, and displaying a comprehensive diagnosis of leakage status in stages.
[0005]
[Problems to be solved by the invention]
However, those described in JP-A-3-248030, JP-A-6-11406, and JP-A-5-264393 are not limited to the condenser outlet through which all the condensate passes or the condenser condensate. A detection point for taking out the detection water is provided on the downstream side of the condensate pump for feeding water or on a pipe connected from the condenser to the steam generator. In this way, if the detection point is provided at the outlet of the condenser, the downstream side of the condensate pump that feeds the condensate of the condenser, or the pipe connected from the condenser to the steam generator, seawater leakage will occur. Even if it takes time until detection, and even if the plant is shut down or the water supply system is shut down after leakage is detected, the seawater mixed with seawater flows out of the condenser and is further fed by the condensate pump. As a result, seawater mixed water may flow into a steam generator or a steam turbine.
[0006]
An object of the present invention is to provide a condenser, a power plant facility, and a method of operating the same, which detects leakage of cooling water at an early stage and suppresses seawater mixed water caused by seawater leakage or the like from flowing into a steam generator or a steam turbine. There is.
[0007]
[Means for Solving the Problems]
The present invention provides the following condenser.
[0008]
That is, the condenser of the present invention condenses the steam flowing in from the turbine, and supplies the condensed condensate to the water supply system leading to the steam generator. The condenser is a heat transfer tube. A condensate condensing part having a pipe nest and condensing steam; and a condensate retaining part retaining the condensate condensed in the condensate condensing part, and detecting the quality of the condensate in the condensate retaining part. A plurality of detectors and / or detection ports for taking the condensate are installed, and based on the water quality detection values detected from the plurality of detectors and / or the detection ports, the condenser is connected to the water supply system. A control valve for adjusting the supply of the condensate to be supplied is provided in the water supply system, and a makeup water system for supplying makeup water to the water supply system downstream from the control valve is provided.
[0009]
The condenser of the present invention condenses steam flowing in from the turbine, and supplies the condensed condensate to a water supply system leading to the steam generator, wherein the condenser is a heat transfer tube. A condensate condensing part having a pipe nest and condensing steam; and a condensate retaining part retaining the condensate condensed in the condensate condensing part, and detecting the quality of the condensate in the condensate retaining part. A plurality of detectors and / or detection ports for taking the condensate are installed, and chemical-diluted water is supplied to the water supply system based on detection values of water quality detected from the plurality of detectors and / or detection ports. It has a chemical injection system to supply.
[0010]
Preferably, in the condenser, the condensate in which the detector and / or the detection port flows out condensate into the water supply system from the upstream side of the condensate accumulating portion where condensate flows from the condensate condensing portion. It is installed apart from the path to the downstream side of the staying part, and the detection value of each water quality detected from these detectors and / or detection ports is compared and detected by the upstream detector and / or detection port. When the detected water quality value is lower than the detected water quality value detected by the downstream detector and / or the detection port, there is provided a determination means for determining seawater leakage.
[0011]
The present invention provides the following power plant equipment.
[0012]
That is, the power plant equipment of the present invention condenses the steam generated by the steam, the steam turbine driven by the steam generated by the steam generator, and the steam discharged from the steam turbine. In a power plant facility comprising a condenser and a water supply system that supplies the condensate to the steam generator, the condenser includes a condensate condensing unit that has a nest of heat transfer tubes and condenses steam. A condensate retention part that retains the condensate condensed in the condensate condensing part, and a detector for detecting water quality of the condensate and / or a detection port for taking up the condensate in the condensate retention part. A plurality of control valves are installed, and a control valve that adjusts the supply of condensate supplied from the condenser to the water supply system based on the detection values detected from the plurality of detectors and / or detection ports. Installed in the water system and communicated with the water supply system downstream of the control valve The makeup water is obtained with the makeup water system for supplying.
[0013]
Further, the power plant equipment of the present invention condenses the steam generated by the steam, the steam turbine driven by the steam generated by the steam generator, and the steam discharged from the steam turbine. In a power plant facility comprising a condenser and a water supply system that supplies the condensate to the steam generator, the condenser includes a condensate condensing unit that has a nest of heat transfer tubes and condenses steam. A condensate retention part that retains the condensate condensed in the condensate condensing part, and a detector for detecting water quality of the condensate and / or a detection port for taking up the condensate in the condensate retention part. A plurality of chemical injection systems are provided that supply chemical dilution water in communication with the water supply system based on detection values of water quality detected from the plurality of detectors and / or detection ports.
[0014]
Preferably, the power plant equipment includes a makeup water tank in which makeup water is stored, and a makeup water supply device that supplies the makeup water stored in the makeup water tank to the condenser or the water supply system. It is a thing.
[0015]
Preferably, a chemical storage tank that stores chemical dilution water that neutralizes condensate mixed with seawater, and chemical dilution water stored in the chemical storage tank is supplied to the condenser or the water supply system. And a chemical dilution water supply device.
[0016]
Preferably, a discharge system for discharging the condensate out of the water supply system is provided upstream of a control valve that controls the flow rate of the condensate supplied to the steam generator.
[0017]
The present invention provides the following operation method of power plant equipment.
[0018]
That is, the operation method of the power plant equipment according to the present invention includes a steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, and condensing the steam discharged from the steam turbine. In a method for operating a power plant having a condenser and a water supply system for supplying the condensate to the steam generator, at a plurality of locations of the condensate retention part for retaining condensate condensed in the condenser. Condensate water quality is detected, seawater leakage is determined based on the water quality detection values detected at the multiple detection points, and when the seawater leakage is determined, the control valve installed in the water supply system is operated. Then, the supply of the condensate supplied from the condenser to the water supply system is adjusted, and the makeup water is supplied to the water supply system from the makeup water system communicating with the water supply system downstream from the control valve. Is.
[0019]
Moreover, the operating method of the power plant equipment of the present invention includes a steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, and condensing steam discharged from the steam turbine. In a method for operating a power plant having a condenser and a water supply system for supplying the condensate to the steam generator, at a plurality of locations of the condensate retention part for retaining condensate condensed in the condenser. Detecting the water quality of the condensate, determining seawater leakage based on the water quality detection values detected at the plurality of detection points, and supplying chemical dilution water to the water supply system when seawater leakage is determined It is.
[0020]
Preferably, the operation method of the power plant equipment is to discharge the condensate mixed with seawater out of the water supply system in the middle of the flow path leading from the condenser to the steam generator when it is determined that the seawater leaks. is there.
[0021]
Further, preferably, the position where the path from the upstream side of the condensate retention part where condensate condensed in the condenser stays to the downstream side of the condensate retention part that flows out condensate into the water supply system is separated. The water quality of the condensate was detected at each of the detection points, and the detection values of the water quality detected at the upstream detection point were detected by the downstream detection means. Seawater leakage is judged when the water quality is lower than the detected water quality.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 is a system configuration diagram of a power plant showing an embodiment of the present invention.
[0023]
The power plant of the present embodiment is roughly composed of a gas turbine system, a steam turbine system, a condensate / feed water system, and a steam generator system.
[0024]
The gas turbine system includes a compressor 1a that compresses air, a combustor 1b that mixes fuel with the air compressed by the compressor 1a and burns, and a gas turbine 1c that is driven by the combustion gas burned in the combustor 1b. Has been.
[0025]
The steam turbine system includes a high pressure steam turbine 2, an intermediate pressure steam turbine 3, and a low pressure steam turbine 4. These steam turbine systems are supplied with steam heated by a steam generator system to be described later. In the present embodiment, the gas turbine 1, the high-pressure steam turbine 2, the medium-pressure steam turbine 3 and the low-pressure steam turbine 4 have a drive shaft formed on one shaft, and drive a generator 5 connected to the drive shaft. Power is generated.
[0026]
The condensate / water supply system condenses the condensate condensed by the condenser 6 and the condenser 6 which condenses the steam that has finished work in the low-pressure steam turbine 4 by cooling the water, for example, by heat exchange with seawater. It is comprised by the feed water piping 6a supplied to a waste heat recovery boiler system. Here, the condensate condensed in the condenser 6 is accumulated in a hot well portion (not shown) in the condenser, and is fed from the lower portion of the condenser to the condensate pump 13 to be pressurized. The condensate whose pressure has been increased by the condensate pump 13 is supplied to the boiler feed water pump 15 and the exhaust heat recovery boiler 16 via the condensate stop valve 23, the ground steam condenser 14, and the feed water stop valve 17, respectively. Further, when there is excess water in the system, it is discharged out of the system from the discharge pipe 19 by controlling the discharge flow rate control valve 20 provided in the water supply pipe 6a.
[0027]
Further, the condenser 6 is connected with an auxiliary steam supply pipe 27 that supplies steam to the condenser 6 to promote deaeration, and a makeup water pipe 22 a that supplies makeup water to the condenser 6. Has been. A makeup water tank 28 is connected to the makeup water pipe 22 a via a makeup water supply valve 21 a and a makeup water pump 26. The makeup water pipe 22a is connected to a makeup water pipe 22b for supplying makeup water supplied by the makeup water pump 26 to the downstream side of the feed water stop valve 17 installed in the feed water pipe 6a. Is provided with a makeup water supply valve 21a.
[0028]
In the present embodiment shown in FIG. 2, the makeup water supplied to the feed water pipe 6a is led from the makeup water tank 28. However, if a plurality of power plants shown in FIG. It is possible to supply condensate from the water device 6 to the water supply pipe 6a. Further, if a plurality of condensing chambers are formed in the condenser 6, it is possible to supply the condensate by switching to the condensate in another condensing chamber.
[0029]
Further, a chemical storage tank 70 in which chemicals or chemical dilution water is stored is connected to the water supply pipe 6a through a chemical supply pipe 73. The chemical supply pipe 73 is provided with a chemical transfer pump 71 for supplying chemical dilution water and a flow rate adjusting valve 72 for adjusting the flow rate of the chemical dilution water. In the present embodiment shown in FIG. 2, the injection point of the chemical dilution water is installed on the downstream side of the water supply stop valve 17, but the water supply pipe 6 a upstream of the water supply stop valve 17 or the exhaust heat recovery is provided. It is also possible to inject into the boiler drum of the boiler 16.
[0030]
In the exhaust heat recovery boiler 16 that is a steam generator system, steam is generated using high-temperature exhaust heat exhausted from the gas turbine 1. The condensate supplied by the boiler feed pump 15 is heated by the exhaust heat recovery boiler 16 to become steam, and the steam generated here flows into the high-pressure steam turbine 2 through the main steam pipe 9. The steam discharged from the high-pressure steam turbine 2 flows through the high-pressure turbine exhaust pipe 18 and is mixed with the medium-pressure steam, and is heated again by the reheater 18 a of the exhaust heat recovery boiler 16. The steam reheated by the reheater 18 a flows through the reheat steam pipe 7 and is supplied to the intermediate pressure steam turbine 3. On the other hand, the low pressure steam heated by the exhaust heat recovery boiler 16 is supplied to the intermediate pressure steam turbine 3 through the low pressure steam pipe 8. The steam supplied to the intermediate-pressure steam turbine 3 by the reheat steam pipe 7 and the low-pressure steam pipe 8 is mixed to become low-pressure steam, and further supplied to the low-pressure steam turbine 4. The reheat steam pipe 7, the low pressure steam pipe 8, and the main steam pipe 9 are connected to a high pressure turbine bypass pipe 11, an intermediate pressure turbine bypass pipe 10, and a low pressure turbine bypass pipe 12, respectively. Steam generated in the exhaust heat recovery boiler 16 by the piping is supplied to the condenser 6.
[0031]
Next, a specific embodiment of the condenser 6 shown in FIG. 2 will be described with reference to FIG. The steam 35 exhausted from the steam turbine flows into the condenser body 31 from above the condenser 6. The steam 35 flowing into the condenser body 31 exchanges heat by passing between the nests 29 of the heat transfer tubes through which cooling water, for example, seawater flows. The heat-exchanged steam 35 is condensed and becomes condensate 44 and drops into a condensate retention part (hot well part) 41. The dripped condensate 44 stays in the condensate retention part 41, flows through the bottom surface inclined toward the condenser outlet 36, and is guided to the outside of the condenser 6.
[0032]
Further, the condenser shown in this embodiment has a structure in which a plurality of detected water outlets 33, 39, 45 are provided in the condensate retention part 41 where the condensate 44 drops. The detection water outlet 33 is installed at a position directly below the tube nest 29, or at a location where the detection water is first retained after dropping. In other words, it is preferable to install the tube nest 29 directly below or near the tube nest 29 that performs heat exchange of steam. The detected water outlet 39 is installed at or near the condenser outlet 36 where the condensate 44 retained in the condensate retaining part 41 is discharged. The detection water outlet 45 is a detection water outlet 33 installed at a position directly below the tube nest 29, a condenser outlet 36 from which the condensate 44 is discharged, or a detection water outlet installed in the vicinity thereof. The condensate 44 retained in the condensate retention part 41 is disposed at a middle position with respect to the condensate retention part 41 or in the middle of the flow toward the condenser outlet 36. The detected water detected at the detected water outlets 33, 39, 45 is subjected to water quality inspection by an inspection device (not shown). In addition, in the thing shown in FIG. 1, the detection water intake 45 is also arrange | positioned at the corner part of the condensate retention part 41. FIG.
[0033]
As described above, in this embodiment, the upstream position and the downstream position of the condensate staying portion 41, the substantially intermediate position of the flow path flowing from the upstream side to the downstream side of the condensate staying section 41, or the midway position of the flow path. The water quality of the condensate 44 is inspected. That is, the detected water intake is separated from the upstream side of the condensate staying part 41 into which the condensate condensed in the tube nest 29 flows, to the downstream side of the condensate staying part 41 that flows out the condensate into the water supply system. There is an exit. The detection water (condensate) taken at the detection water outlets 33, 39, and 45 shown in FIG. 1 is led to a water quality measuring instrument (not shown) via a pipe connected to each detection water intake. Therefore, water quality inspection of each detected water collected at the plurality of detected water intakes described above is performed. Although it is possible to directly monitor the water quality by installing a detector in the condenser (condensate staying part 41), the temperature and flow rate of the condensate staying in the condensate staying part 41 are not constant. Therefore, there is a risk of being affected by these state changes during water quality detection. Therefore, in the present embodiment, by detecting the detection water from the detection water outlet, the measurement condition of the condensate can be made close to a constant value, and it is possible to detect seawater leakage more accurately and stably. Details of the seawater leakage detection method will be described later.
[0034]
As described above, according to the present embodiment, since the detection water outlet 33 is installed at a position directly below the tube nest 29, when seawater leaks, seawater mixed water is detected immediately after the condensate drops. Is done. Therefore, take a long time to take preventive measures such as stopping the supply of condensate before the condensate mixed with seawater is supplied to other plant components such as steam generators and steam turbines. Can do. Further, the detection value detected at the detection water outlet 39 installed in the vicinity of the condenser outlet 36 is detected with a time delay compared to the detection value detected immediately below the tube nest 29.
[0035]
Although FIG. 1 shows an example in which the detection water outlets 33, 39, and 45 are installed in the condensate retention part 41 as means for detecting the water quality of the condensate, detection that can detect seawater leakage is shown. It is also possible to install a vessel. In that case, it is desirable to install a detector at the same location as or near the detection water outlets 33, 39, 45 shown in FIG. It is also possible to install the detection water intake and the detector in combination.
[0036]
Next, a seawater leakage detection method in this embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating a characteristic example of conductivity and conductivity difference. In the figure, A indicates the electrical conductivity characteristics during plant start-up operation, B indicates normal operation, and C indicates seawater leakage characteristics. In this embodiment, a conductivity detector is used for water quality inspection, and the detection water outlet is located immediately below the tube nest 29 on the upstream side of the condensate accumulating portion and the condenser outlet 36 on the downstream side. It is an example installed at each position.
[0037]
In a power plant having a steam turbine, the electrical conductivity of the entire system may greatly change due to the influence of dissolved carbon dioxide gas or impurities at the time of startup or the like. That is, as shown by A at the time of start-up or the like, the conductivity increases because it contains a lot of dissolved carbon dioxide gas at the time of start-up or the like, while the conductivity becomes low as shown by B during normal operation. Therefore, if only the absolute value of conductivity is monitored, it cannot be determined whether the cause of the increase in conductivity is due to startup or due to leakage of cooling water such as seawater. It was necessary to switch the limit value to be generated. In addition, since it takes time to detect seawater leakage, even if the plant is shut down or the water supply system is closed after the leakage is detected, the seawater-mixed water that is mixed with seawater flows out of the condenser. There was a possibility that the mixed water would flow into a steam generator or a steam turbine.
[0038]
In contrast, in this embodiment, as described above, the detection water intakes are installed on the upstream side and the downstream side of the condensate retention part, respectively, and the difference in conductivity between the two detectors is monitored. Yes. With the configuration as described above, for example, when paying attention to the characteristic of the difference in conductivity between two locations shown during the plant start-up operation of A or the normal operation of B, the characteristic of change is the magnitude of the original conductivity. It will be the same regardless.
[0039]
Here, when seawater leaks as shown in C, the seawater mixed water mixed with seawater is detected by the upstream detector and then detected by the downstream detector with a time delay. Therefore, until the seawater mixed water reaches the downstream detector, the instruction value of the upstream detector and the instruction value of the downstream side are greatly different, and the difference in conductivity is large. Therefore, by monitoring the difference in conductivity between the two detection points, it is possible to detect seawater leakage early, and it is possible to detect only the leakage of cooling water, such as seawater, without resetting the alarm limit value according to the operating state. It becomes possible to detect with high accuracy.
[0040]
Further, it is possible to determine whether the leakage is large or small depending on the degree of change in the conductivity difference between the two detection points. That is, when the conductivity difference increases rapidly with time, or when the conductivity difference exceeds a preset limit value, it is determined that a large-scale leakage has occurred. In addition, if the conductivity difference increases slowly, or if the conductivity difference is smaller than a preset limit value, but the detected conductivity value does not decrease even after a certain period of time, it is small. Judge as a leak.
[0041]
Here, if the leakage is determined to be large-scale, the plant operation is stopped or the load is lowered to a load determined to be safe, and the system is isolated so that condensate mixed with cooling water, for example, seawater does not flow into the turbine or the like. . In addition, when it is determined that the leakage is small, a chemical or chemical dilution water for neutralizing seawater mixed water is injected.
[0042]
Hereinafter, the operation method of the plant at the time of seawater leakage is demonstrated using FIG. FIG. 4 is a flowchart showing details of the operation method of the plant when seawater leaks.
[0043]
Usually, water quality inspection inside the condenser is performed on the upstream side and the downstream side of the condenser accumulating section (101). Then, it is determined whether or not the detection value detected from the upstream or downstream detection point is higher than a preset set value (102), and any of the detection points detected at the upstream or downstream detection point is determined. If the detected value is also lower than the set value, it is determined that there is no leakage of seawater (103). Here, when the detection value detected in at least one of the upstream detectors installed in the condenser shows a value higher than a preset value, the downstream detection is performed. The detected value detected at the point is compared (104). When the difference from the detection value detected by the downstream detector is larger than a preset value, it is determined that a large-scale seawater leak has occurred inside the condenser (105). In this case, in order to suppress the condensate containing seawater from flowing into the steam generator, the steam turbine, etc., it is necessary to urgently stop the supply of the condensate containing seawater to the steam generator. Therefore, as shown in FIG. 4, in response to the signal of seawater leakage, an inflow prevention measure (106) for seawater mixed water into a steam generator or the like is automatically performed.
[0044]
As an example, the water supply stop valve 17 installed upstream of the steam generator is closed to prevent the seawater mixed water flowing from the condenser from flowing downstream. Further, in order to prevent the steam generator from becoming empty due to the stoppage of the water supply, make-up water stored in the make-up water tank is supplied to the water supply pipe by the make-up water pump. Here, when the surplus water is supplied due to the supply of makeup water, the control device controls the discharge flow rate control valve installed in the discharge pipe of the spillover system in the opening direction to discharge the excess water (107). . Moreover, as another example, the condensate stop valve installed upstream of the steam generator is closed to suppress the seawater mixed water flowing from the condenser from flowing downstream. Further, in order to prevent the steam generator from emptying due to the stop of the condensate, the makeup water stored in the makeup water tank is supplied to the water supply pipe by the makeup water pump. Here, when the water becomes surplus due to the supply of makeup water, the control device controls the flow rate control valve installed in the discharge pipe of the spillover system in the opening direction to discharge the surplus water (108). By these operations, the plant equipment can be protected, and the load can be lowered to a safe load that is not affected by the leakage, or the plant can be stopped (109).
[0045]
Moreover, in FIG. 4, even when it is a value higher than a preset value set in advance in at least one of the upstream detectors installed in the condenser, If the difference between the two is smaller than a preset value (110), there is a temporary increase in electrical conductivity at start-up or small-scale seawater leakage that does not increase the electrical conductivity rapidly. It is possible that In this case, when the detected value does not decrease even if the operation is continued, it is determined that cooling water, for example, seawater is leaking in a small scale inside the condenser (111). In the case of small-scale leaks, it is not necessary to immediately isolate the leak location, drop the plant load, or shut down the plant, so measures should be taken to mitigate the effects of seawater mixed water flowing into the steam generator, etc. (112). As an effect mitigation measure, emergency treatment is performed by, for example, injecting chemicals or chemical dilution water for neutralizing seawater mixed water (113). Even after implementing this mitigation measure, the water quality is continuously monitored to determine whether it is necessary to shut down the plant or reduce the load (114). That is, when it is determined that injection of chemicals or chemical dilution water alone is not sufficient, a plant load drop or plant shutdown operation is performed (109), and it is determined that there is no need for plant shutdown or load drop. If so, plant operation will continue (116). In addition, sodium phosphate etc. are generally used as an example of the chemical | medical agent or chemical | medical agent dilution water to inject | pour.
[0046]
Moreover, the value which is higher than the preset value set in advance in at least one of the upstream detectors installed in the condenser, and the difference between the downstream detector and the preset value is preset. If the detected value of the conductivity decreases with the operation time, it is determined that the conductivity is temporarily increased at the time of startup (115), and the operation of the plant is continued (116).
[0047]
Next, the control method of the power plant of a present Example is demonstrated using FIG. FIG. 5 is a simplified diagram of the system configuration shown in FIG. 2, and the description of the same components as those in FIG. 2 is omitted.
[0048]
As described above, a detection water intake is provided at the hot well inlet and outlet (not shown) of the condenser 6, and the quality of the water taken out through the piping is monitored by the detectors 65 and 55. Further, the condenser 6 is provided with a water level meter 66 to detect the water level of the condensate remaining in the condensate retention part. Information detected by the detection units 65 and 55 and the water level meter 66 is transmitted to the control device 64. The control device 64 performs opening / closing control of the water supply stop valve 17, the makeup water supply valve 21 b, and the discharge flow rate adjustment valve 20 based on the transmitted information.
[0049]
In the present embodiment, the condensate is detected by the detection units 65 and 55, and the change in the detection value is detected by the control device 64 to determine the degree of leakage. If seawater leaks inside the condenser 6, it is necessary to quickly isolate the leaked portion by suppressing the seawater mixed water from flowing into the plant equipment such as a steam turbine. If it is determined from the detection result that the degree of leakage is large, the water supply stop valve 17 installed upstream of the steam generator 60 is closed, and the seawater mixed water flowing from the condenser 6 is closed. Is suppressed from flowing downstream. Further, in order to prevent the steam generator 60 from becoming empty due to the stoppage of the water supply, make-up water stored in the make-up water tank 28 is supplied to the water supply pipe 6 a by the make-up water pump 26. Here, when the surplus water is supplied due to the supply of the makeup water, the control device 64 controls the discharge flow rate control valve 20 installed in the discharge pipe 19 of the spillover system in the opening direction to discharge the surplus water. Is done.
[0050]
As described above, according to the present embodiment, in order to prevent the seawater from flowing into the steam turbine or the like when the seawater leakage is large, when the leakage detection signal is received, the control device 64 stops the water supply. By closing the valve 17 and supplying makeup water to the downstream side of the water supply stop valve 17 and discharging excess water outside the system by supplying makeup water, the condensate mixed with cooling water is downstream of the condenser. It is possible to suppress the flow into the steam turbine 51 via the steam generator 60 early and with high reliability without depending on the judgment of the operator. Furthermore, according to the present embodiment, it is possible to perform a load drop to a safe load that does not affect the plant equipment without causing an emergency stop of the plant.
[0051]
FIG. 6 is a system configuration diagram of a power plant showing another embodiment of the present invention. FIG. 6 is a simplified system configuration diagram shown in FIG. 2, and the description of the same configuration as that in FIG. 2 is omitted.
[0052]
In this embodiment, a chemical storage tank 70 in which chemicals or chemical dilution water is stored, a chemical supply pipe 73 that guides the chemicals or chemical dilution water to the steam generator 60, and a chemical supply pipe 73 installed in the chemical supply pipe 73 are steamed. A chemical transfer pump 71 for supplying water to the generator 60 and a flow rate adjusting valve 72 for adjusting the flow rate of the chemical or chemical dilution water supplied to the steam generator 60 are provided.
[0053]
Further, as described above, a detection water outlet is provided at a portion directly below the tube nest of the condensate accumulating portion (not shown) of the condenser 6 and at the outlet of the condenser, and the water taken out through the pipe is detected by the detection portion. Water quality is monitored at 65,55. Information detected by the detection units 65 and 55 is transmitted to the control device 64. The control device 64 controls the chemical transfer pump 71 and the flow rate adjustment valve 72 based on the transmitted information.
[0054]
In the present embodiment, the water quality of the condensate is monitored by the detection units 65 and 55, and a change in the detected value is detected by the control device 64 to determine the degree of leakage. If a leak of cooling water, for example, seawater occurs inside the condenser 6 and it is determined from the detection result that the degree of leakage is small, the chemical storage is continued while the plant operation is continued. The chemical or chemical dilution water in the tank 70 is supplied to the water supply pipe 6a by the chemical transfer pump 71, and then the plant is manually stopped.
[0055]
In this embodiment, when the cooling water leakage is small and it is not necessary to immediately stop the outflow of the condensate from the condenser 6, it is necessary to cope with the leakage. The injection is performed while controlling the injection amount by the signal from the control device 64 with chemicals or chemical dilution water that alleviates the influence on the water. By controlling as described above, it is possible to reduce the load to a safe load that does not affect the plant equipment without causing an emergency stop of the plant.
[0056]
FIG. 7 is a view showing a modification of the condenser shown in FIG. In the present embodiment, the condenser is divided into a structure 30, for example, a steam condensing part 40 and a condensate retention part 41 by a top plate.
[0057]
The steam 35 exhausted from the steam turbine flows into the steam condensing part 40 inside the condenser body 31 from above the condenser 6. The inflowing steam 35 exchanges heat by passing between the nests 29 through which cooling water, for example, seawater flows. The heat-exchanged steam 35 is condensed to condensate and drops from the tube nest 29 to the structure 30. Condensate dripped onto the structure 30 flows over the structure 30 and is introduced into the condensate retention part 41 by a connecting part 34 provided at one corner of the structure 30. The condensate introduced into the condensate retention part 41 flows through the condensate retention part 41 and is discharged from the condenser outlet 36 to the outside. In addition, the connection part 34 which connects the steam condensing part 40 and the condensate retention part 41 seems that condensate flows into the location farthest from the condenser outlet 36 with respect to the flow of water inside the condensate retention part 41. Is formed.
[0058]
Further, the condensate staying part 41 is provided with a detection water outlet 33 for monitoring the water quality of the condensate, directly below or in the vicinity of the connecting part 34, that is, at the most upstream part of the condensate staying part 41. Yes. Further, the detected water outlet 39 is installed at or near the condenser outlet 36 where the condensate 44 retained in the condensate retention part 41 is discharged, that is, at the most downstream part of the condensate retention part 41. In addition, the detection water outlet 45 discharges the condensate 44 retained in the condensate retention part 41 and the detection water intake 33 installed in or near the location where the condensate 44 flows into the condensate retention part 41. The condenser outlet 36, or a substantially intermediate position with the detection water outlet 39 installed in the vicinity of the condenser outlet 36, or a flow path in which the condensate 44 flowing into the condensate retention part 41 flows toward the condenser outlet 36. It is installed in the middle.
[0059]
According to the present embodiment, even if leakage of cooling water such as seawater occurs, the leakage can be detected immediately after the seawater-mixed water flows into the condensate staying portion 41 by the detection water outlet 33. Therefore, it takes a long time to take preventive measures such as stopping the supply of condensate before the condensate mixed with seawater is supplied to other plant components such as steam generators and steam turbines. be able to. In this way, by monitoring the conductivity difference between the two detection points, it becomes possible to detect seawater leakage at an early stage, and there is a large amount of seawater leakage without resetting the alarm limit value depending on the operating state. It is possible to reliably determine whether it is small or small. When it is determined that the seawater leaks, the preventive measure is selected according to the scale of the seawater leak as in the flowchart shown in FIG. 4 described above.
[0060]
FIG. 8 is a view showing a modification of the condenser shown in FIG. In the condenser 6 shown in the present embodiment, the steam condensing unit 40 and the condensate retention unit 41 are configured by independent housings.
[0061]
The steam 35 exhausted from the steam turbine flows into the steam condensing part 40 inside the condenser body 31 from above the condenser 6. The inflowing steam 35 exchanges heat by passing between the nests 29 through which cooling water, for example, seawater flows. The heat-exchanged steam 35 is condensed to condensate and drops from the tube nest 29 to the bottom of the steam condensing part 40 of the housing. Condensate dripped onto the bottom of the steam condensing unit 40 is introduced from a connecting part 42 formed at one corner thereof into a condensate retention part 41 of the casing. The condensate introduced into the condensate retention part 41 is discharged from the condenser outlet 36 to the outside. In addition, the connection part 42 which connects the steam condensing part 40 and the condensate retention part 41 seems that condensate flows in into the location farthest from the condenser exit 36 with respect to the flow of water in the condensate retention part 41. Is formed.
[0062]
Further, the condensate staying part 41 is provided with a detection water outlet 33 for monitoring the water quality of the condensate, directly below or near the connecting part 42, that is, at the most upstream part of the condensate staying part 41. Yes. Further, the detected water outlet 39 is installed at or near the condenser outlet 36 where the condensate 44 retained in the condensate retention part 41 is discharged, that is, at the most downstream part of the condensate retention part 41. In addition, the detection water outlet 45 discharges the condensate 44 retained in the condensate retention part 41 and the detection water intake 33 installed in or near the location where the condensate 44 flows into the condensate retention part 41. The condenser outlet 36, or a substantially intermediate position with the detection water outlet 39 installed in the vicinity of the condenser outlet 36, or a flow path in which the condensate 44 flowing into the condensate retention part 41 flows toward the condenser outlet 36. It is installed in the middle.
[0063]
As described above, according to the present embodiment, even when cooling water, for example, seawater leaks, leakage can be detected immediately after the seawater mixed water flows into the condensate retention portion 41 by the detection water outlet 33. . Further, by installing the detection water outlet 33 in the condensate retention part 41, for example, the most upstream part of the condensate in the hot well, therefore, the condensate mixed with seawater can be converted into another plant such as a steam generator or a steam turbine. A time margin for taking a preventive measure such as stopping the supply of condensate before being supplied to the component equipment can be taken long.
[0064]
Furthermore, in this embodiment, detection points are provided at a plurality of locations in the most upstream portion and the most downstream portion of the condensate retention portion 41, and further in the middle portion, and leakage is observed by observing the degree of change in the respective conductivity differences. Can be reliably determined whether the scale is large or small. Therefore, by monitoring the conductivity difference between the two detection points, it is possible to detect seawater leaks at an early stage, and accurately detect only seawater leaks without resetting the alarm limit values according to the operating conditions. It becomes possible to do. When it is determined that the seawater leaks, the preventive measure is selected according to the scale of the seawater leak as in the flowchart shown in FIG. 4 described above.
[0065]
FIG. 9 is a view showing a modification of the condenser shown in FIG. The condenser 6 shown in the present embodiment has a configuration in which a steam condensing unit 40 and a condensate retention unit 41, which are independent casings, are arranged at adjacent positions.
[0066]
Similarly to what was mentioned previously, the vapor | steam 35 which flowed into the condenser 6 is condensed by heat exchange, is condensed, and is dripped at the bottom part of the vapor | steam condensation part 40 of a housing | casing. Condensate dripped onto the bottom of the steam condensing unit 40 is introduced from a connecting part 42 formed at one corner thereof into a condensate retention part 41 of the casing. The condensate introduced into the condensate retention part 41 is discharged from the condenser outlet 36 to the outside. It should be noted that the outlet of the connecting part 42 that communicates from the steam condensing part 40 to the condensate staying part 41 flows into the part farthest from the condenser outlet 36 with respect to the flow of water inside the condensate staying part 41. It is formed to do.
[0067]
Further, the condensate retention part 41 is provided with a detection water outlet 33 for monitoring the water quality of the condensate in the vicinity of the communication part 42, that is, at the most upstream part of the condensate retention part 41. Further, the detected water outlet 39 is installed at or near the condenser outlet 36 where the condensate 44 retained in the condensate retention part 41 is discharged, that is, at the most downstream part of the condensate retention part 41.
[0068]
Although not particularly illustrated, a flow path in which the condensate 44 that has flowed into the condensate retention part 41 flows toward the condenser outlet 36 at a substantially intermediate position between the detection water outlet 33 and the detected water outlet 39. It is also possible to install the detected water outlet 45 at a midway position.
[0069]
As described above, according to the present embodiment, even when cooling water, for example, seawater leaks, leakage can be detected immediately after the seawater mixed water flows into the condensate retention portion 41 by the detection water outlet 33. . Further, by installing the detection water outlet 33 at the most upstream part of the condensate retention part 41, for example, the condensate retention part 41, the condensate mixed with seawater is transferred to other plant components such as a steam generator and a steam turbine. It is possible to take a long time margin for taking preventive measures such as stopping the supply of condensate until it is supplied.
[0070]
Furthermore, in this embodiment, detection points are provided at a plurality of locations such as the most upstream portion and the most downstream portion of the condensate staying portion 41, and further the intermediate portion thereof, and leakage is observed by observing the degree of change in each conductivity difference. Can be reliably determined whether the scale is large or small. Therefore, by monitoring the conductivity difference between the two detection points, it is possible to detect seawater leaks at an early stage, and accurately detect only seawater leaks without resetting the alarm limit values according to the operating conditions. It becomes possible to do. When it is determined that the seawater leaks, the preventive measure is selected according to the scale of the seawater leak as in the flowchart shown in FIG. 4 described above.
[0071]
FIG. 10 is a view showing a modification of the condenser shown in FIG.
[0072]
In the present embodiment, the condenser 6 is partitioned into a steam condensing part 40 and a condensate retention part 41 by a top plate 43, and the condensate retention part 41 is partitioned by a partition plate 37 to form a separating bottleneck. . The condenser 6 is provided with a deaeration steam injection pipe 32 for injecting steam into the condensate in the condensate retention part 41, and the injected steam is connected to the deaeration steam injection pipe 32. It is led from 38 to the inside of the condenser.
[0073]
The steam 35 exhausted from the steam turbine flows into the steam condensing part 40 inside the condenser body 31 from above the condenser 6. The inflowing steam 35 exchanges heat by passing between the nests 29 through which cooling water, for example, seawater flows. The heat-exchanged steam 35 is condensed and becomes condensate and drops from the tube nest 29 to the top plate 43. The condensate dropped on the top plate 43 flows on the top plate 43 and is introduced into the condensate retention portion 41 by the connecting portion 34 provided at one corner of the top plate 43. The condensate introduced into the condensate retention part 41 flows along the bottleneck formed by the partition plate 37 and is discharged from the condenser outlet 36 to the outside. In addition, the connection part 34 which connects the steam condensing part 40 and the condensate retention part 41 seems that condensate flows into the location farthest from the condenser outlet 36 with respect to the flow of water inside the condensate retention part 41. Is formed.
[0074]
Further, the condensate staying part 41 is provided with a detection water outlet 33 for monitoring the water quality of the condensate, directly below or in the vicinity of the connecting part 34, that is, at the most upstream part of the condensate staying part 41. Yes. Further, the detected water outlet 39 is installed at or near the condenser outlet 36 where the condensate 44 retained in the condensate retention part 41 is discharged, that is, at the most downstream part of the condensate retention part 41.
[0075]
Although not particularly illustrated, a flow path in which the condensate 44 that has flowed into the condensate retention part 41 flows toward the condenser outlet 36 at a substantially intermediate position between the detection water outlet 33 and the detected water outlet 39. It is also possible to install the detected water outlet 45 at a midway position.
[0076]
Further, in this embodiment, when degassing of the condensate is necessary at the time of start-up or the like, the steam is led into the condenser by the degassing steam pipe 38 and submerged in the condensate inside the hot well. Steam is injected into the condensate from the degassing steam injection pipe 32 to promote degassing.
[0077]
As described above, according to the present embodiment, the upper portion of the hot well, that is, the condensate retention portion 41 is widely covered with the top plate 43, and the condensate retention portion 41 is partitioned by the partition plate 37 to form a bottleneck. Even if a seawater leak occurs, until the condensate mixed with seawater comes into the system from the condenser hot well, that is, the condensate mixed with seawater. Can take a long time to take preventive measures such as stopping the supply of condensate until it is supplied to other plant components such as a steam generator and a steam turbine. Further, even when seawater leaks, the detection water outlet 33 is installed at the most upstream part of the condensate retention part 41, for example, the condensate in the hot well. Leakage can be detected immediately after inflow.
[0078]
Therefore, by monitoring the difference in conductivity between the two detection points, it is possible to detect seawater leakage early, and it is possible to detect only the leakage of cooling water, such as seawater, without resetting the alarm limit value according to the operating state. It becomes possible to detect with high accuracy. When it is determined that the seawater leaks, the preventive measure is selected according to the scale of the seawater leak as in the flowchart shown in FIG. 4 described above.
[0079]
FIG. 10 is a system configuration diagram of a power plant showing another embodiment of the present invention. The description of the same configuration as that in FIG. 2 is omitted.
[0080]
In the present embodiment, the makeup water pipe 22 b for guiding makeup water is connected to the downstream side of the water supply stop valve 23, that is, the upstream side of the ground steam condenser 14. Further, a drain pipe 25 is installed in the downstream of the condensate pump 13 via a drain flow rate adjusting valve 24.
[0081]
In the above configuration, when seawater as cooling water leaks inside the condenser 6, it flows into the exhaust heat recovery boiler 16, the high pressure steam turbine 2, the intermediate pressure steam turbine 3, the low pressure steam turbine 4, and the like. In order to suppress this, first, the condensate stop valve 23 installed at the outlet of the condensate pump 13 is closed so that the condensate mixed with seawater flowing from the condenser 6 flows downstream. Suppress and isolate the leak. Next, in order to ensure the amount of water supply required for the exhaust heat recovery boiler 16, the makeup water supply valve 21b installed in the makeup water piping 22b is controlled to supply the makeup water downstream of the condensate stop valve 23. Further, the internal retained water that becomes surplus by replenishing the replenishing water is discharged outside the system through the drainage pipe 25 connected to the downstream side of the condensate pump 13 by adjusting the drainage flow rate adjustment valve 24.
[0082]
FIG. 12 is a simplified diagram of the system configuration shown in FIG.
[0083]
A detection water outlet is provided at the position immediately below the tube nest of the condensate retention portion (not shown) of the condenser 6 and at the outlet of the condenser as described above, and the water taken out via the pipe is The water quality is monitored by the detectors 65 and 55. Further, the condenser 6 is provided with a water level meter 66 to detect the water level of the condensate remaining in the hot well. Information detected by the detection units 65 and 55 and the water level meter 66 is transmitted to the control device 64. The control device 64 performs opening / closing control of the condensate stop valve 23, the makeup water supply valve 21b, and the drainage flow rate adjustment valve 24 based on the transmitted information.
[0084]
In the present embodiment, the water quality of the condensate is monitored by the detection units 65 and 55, and a change in the detected value is detected by the control device 64 to determine the degree of leakage. If a leak of cooling water, for example seawater, occurs in the condenser 6, the seawater mixed water is prevented from flowing into plant equipment such as a steam turbine, and the leaked portion is quickly isolated. There is a need. If it is determined from the detection result that the degree of leakage is large, the condensate stop valve 23 installed downstream of the condensate pump 13 is closed, and seawater mixed water flowing from the condenser 6 is closed. Is suppressed from flowing downstream. Further, in order to prevent the steam generator 60 from becoming empty due to the stoppage of the water supply, make-up water stored in the make-up water tank 28 is supplied to the water supply pipe 6 a by the make-up water pump 26. Here, when water becomes surplus by supply of makeup water, the control device 64 controls the drainage flow rate adjustment valve 24 installed in the drainage pipe 25 in the opening direction, and the surplus water is discharged.
[0085]
As described above, according to the present embodiment, in order to prevent seawater from flowing into the plant equipment when seawater leakage is large, when the leakage detection signal is received, the control device 64 sets the condensate stop valve. 23 is closed, replenishment water is replenished to the downstream side of the condensate stop valve 23, and excess water is discharged from the downstream side of the condensate pump 13 by supplying replenishment water, thereby mixing cooling water. The condensate that has flowed out downstream of the condenser and flows into the steam turbine 51 and the like via the steam generator 60 can be suppressed early and with high reliability without depending on the judgment of the operator. Furthermore, according to the present embodiment, it is possible to perform a load drop to a safe load that does not affect the plant equipment without causing an emergency stop of the plant.
[0086]
If it is determined that seawater leakage is small, the chemical or chemical dilution water in a chemical storage tank (not shown) is supplied to the water supply pipe 6a while continuing the plant operation, and then the plant is manually stopped. By controlling as described above, it is possible to reduce the load to a safe load that does not affect the plant equipment without causing an emergency stop of the plant.
[0087]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the leakage of cooling water can be detected at an early stage, and it can suppress that the seawater mixed water by seawater leakage etc. flows into a steam generator or a steam turbine.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a condenser according to an embodiment of the present invention.
FIG. 2 is a system configuration diagram of a power plant showing an embodiment of the present invention.
FIG. 3 is a diagram showing a characteristic example of conductivity and conductivity difference.
FIG. 4 is a flowchart of a method for operating a power plant that is an embodiment of the present invention.
FIG. 5 is a system configuration diagram of the power plant shown in FIG. 2;
6 is a system configuration diagram of the power plant shown in FIG. 2. FIG.
7 is a view showing a modification of the condenser shown in FIG. 1. FIG.
FIG. 8 is a view showing a modification of the condenser shown in FIG.
FIG. 9 is a view showing a modification of the condenser shown in FIG.
10 is a view showing a modification of the condenser shown in FIG. 1. FIG.
FIG. 11 is a system configuration diagram of a power plant showing another embodiment of the present invention.
12 is a system configuration diagram of the power plant shown in FIG. 11. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Gas turbine, 2 ... High pressure steam turbine, 3 ... Medium pressure steam turbine, 4 ... Low pressure steam turbine, 5 ... Generator, 6 ... Condenser, 6a ... Feed water piping, 7 ... Reheat steam piping, 8 ... Low pressure Steam piping, 9 ... Main steam piping, 10 ... Medium pressure turbine bypass piping, 11 ... High pressure turbine bypass piping, 12 ... Low pressure turbine bypass piping, 13 ... Condensate pump, 14 ... Grand steam condenser, 15 ... Boiler feed pump 16 ... Waste heat recovery boiler, 17 ... Water supply stop valve, 18 ... High-pressure turbine exhaust pipe, 18a ... Reheater, 19 ... Discharge pipe, 20 ... Discharge flow rate adjustment valve, 21a, 21b ... Supply water supply valve, 22a, 22b ... Supply water piping, 23 ... Condensation stop valve, 24 ... Drainage flow control valve, 25 ... Drainage piping, 26 ... Supply water pump, 27 ... Auxiliary steam supply piping, 28 ... Supply water tank, 29 ... Nest, 30 …Structure, DESCRIPTION OF SYMBOLS 1 ... Condenser fuselage, 32 ... Deaeration steam injection pipe, 33 ... Detection water outlet, 34 ... Communication part, 35 ... Steam, 36 ... Condenser exit, 37 ... Partition plate, 38 ... Deaeration steam pipe, DESCRIPTION OF SYMBOLS 39 ... Detection water outlet, 40 ... Steam condensing part, 41 ... Condensate retention part, 42 ... Communication part, 43 ... Top plate, 44 ... Condensate, 45 ... Detection water outlet, 51 ... Steam turbine, 55, 65 DESCRIPTION OF SYMBOLS ... Detection part, 59 ... Feed water pump, 60 ... Steam generator, 64 ... Control device, 66 ... Water level meter, 68 ... Discharge piping, 69, 72 ... Flow control valve, 70 ... Chemical storage tank, 71 ... Chemical transfer pump, 73: Chemical supply piping.

Claims (24)

タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、
前記複数個の検出器及び／又は検出口から検出された水質検出値に基づいて、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記給水系統に設置し、前記制御弁より下流側の該給水系統に補給水を供給する補給水系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser includes a condensate condensing unit that has a heat transfer tube nest and condenses steam, and a condensate retaining unit that retains the condensate condensed in the condensate condensing unit, and the condensate retaining unit A plurality of detectors for detecting the water quality of the condensate and / or a plurality of detection ports for taking the condensate,
A control valve for adjusting the supply of condensate supplied from the condenser to the water supply system is installed in the water supply system based on the water quality detection values detected from the plurality of detectors and / or detection ports. A condenser comprising a makeup water system for supplying makeup water to the water system downstream from the control valve. タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、
前記複数個の検出器及び／又は検出口から検出された水質の検出値に基づいて、前記給水系統に薬品希釈水を供給する薬注系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser includes a condensate condensing unit that has a heat transfer tube nest and condenses steam, and a condensate retaining unit that retains the condensate condensed in the condensate condensing unit, and the condensate retaining unit A plurality of detectors for detecting the water quality of the condensate and / or a plurality of detection ports for taking the condensate,
A condenser having a chemical injection system for supplying chemical dilution water to the water supply system based on a plurality of detectors and / or detection values of water quality detected from the detection ports. 前記検出器及び／又は検出口は、該復水凝縮部から復水が流入する復水滞留部の上流側から、該給水系統に復水を流出する復水滞留部の下流側に至る経路に離間して設置され、これら検出器及び／又は検出口から検出される夫々の水質の検出値を比較して、上流側の検出器及び／又は検出口で検出した水質の検出値が下流側の検出器及び／又は検出口で検出した水質の検出値より水質が低下した場合に海水漏洩を判断する判定装置を備えたことを特徴とする請求項１または２に記載の復水器。The detector and / or the detection port is on a path from the upstream side of the condensate retention part where condensate flows from the condensate condensing part to the downstream side of the condensate retention part that flows out condensate into the water supply system. The detection values of the water quality detected by the upstream detector and / or the detection port are compared with each other by comparing the detection values of the water quality detected from the detectors and / or the detection ports. The condenser according to claim 1 or 2, further comprising a determination device that determines seawater leakage when the water quality is lower than a detected value of the water quality detected by the detector and / or the detection port. タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部と、該復水滞留部に滞留した復水を復水器から該給水系統へ導く復水出口部とを備え、前記復水凝縮部を構成する伝熱管の管巣の直下の復水滞留部に該復水の水質を検出する第１の検出手段を設置し、前記復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された復水の水質の検出値の差に基づいて、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記給水系統に設置し、前記制御弁より下流側の該給水系統に補給水を供給する補給水系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser has a heat transfer tube nest and condensate condensing part for condensing steam, condensate retaining part for retaining condensate condensed in the condensate condensing part, and retaining in the condensate retaining part. And a condensate outlet for guiding the condensate from the condenser to the water supply system, and detecting the quality of the condensate in the condensate retention part immediately below the nest of the heat transfer tube constituting the condensate condensing part Installing a first detection means, installing a second detection means for detecting the quality of the condensate water at or near the condensate outlet,
A control valve that adjusts the supply of condensate supplied from the condenser to the water supply system based on a difference between detected values of the water quality of the condensate detected from the first and second detection means; A condenser having a makeup water system installed in the system and configured to supply makeup water to the water supply system downstream from the control valve. タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部と、該復水滞留部に滞留した復水を復水器から該給水系統へ導く復水出口部とを備え、前記復水凝縮部を構成する伝熱管の管巣の直下の復水滞留部に該復水の水質を検出する第１の検出手段を設置し、前記復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された水質の検出値の差に基づいて、前記給水系統に薬品希釈水を供給する薬注系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser has a heat transfer tube nest and condensate condensing part for condensing steam, condensate retaining part for retaining condensate condensed in the condensate condensing part, and retaining in the condensate retaining part. And a condensate outlet for guiding the condensate from the condenser to the water supply system, and detecting the quality of the condensate in the condensate retention part immediately below the nest of the heat transfer tube constituting the condensate condensing part Installing a first detection means, installing a second detection means for detecting the quality of the condensate water at or near the condensate outlet,
A condenser having a chemical injection system for supplying chemical dilution water to the water supply system based on a difference between detection values of water quality detected from the first and second detection means. タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部と区画された復水滞留部と、前記復水凝縮部にて凝縮された復水を前記復水滞留部に導く復水連絡部と、前記復水滞留部に滞留した復水を復水器から給水系統へ導く復水出口部とを有し、
前記復水滞留部に、前記復水凝縮部から凝縮された復水を導く復水連絡部、或いはその近傍に復水の水質を検出する第１の検出手段を設置し、前記復水凝縮部に滞留した復水を復水器から給水系統に導く復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された復水の水質の検出値の差に基づいて、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記給水系統に設置し、前記制御弁より下流側の該給水系統に補給水を供給する補給水系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser includes a condensate condensing part having a heat transfer tube nest and condensing steam, a condensate condensing part partitioned from the condensate condensing part, and a condensate condensed in the condensate condensing part. A condensate communication part for guiding water to the condensate retention part, and a condensate outlet part for guiding the condensate retained in the condensate retention part from the condenser to the water supply system,
The condensate condensing unit is provided with a condensate communication unit for guiding the condensate condensed from the condensate condensing unit, or a first detection means for detecting the water quality of the condensate in the vicinity thereof. The second detection means for detecting the water quality of the condensate is installed at or near the condensate outlet for guiding the condensate accumulated in the condenser to the water supply system,
A control valve that adjusts the supply of condensate supplied from the condenser to the water supply system based on a difference between detected values of the water quality of the condensate detected from the first and second detection means; A condenser having a makeup water system installed in the system and configured to supply makeup water to the water supply system downstream from the control valve. タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部と区画された復水滞留部と、前記復水凝縮部にて凝縮された復水を前記復水滞留部に導く復水連絡部と、前記復水滞留部に滞留した復水を復水器から給水系統へ導く復水出口部とを有し、
前記復水滞留部に、前記復水凝縮部から凝縮された復水を導く復水連絡部、或いはその近傍に復水の水質を検出する第１の検出手段を設置し、前記復水凝縮部に滞留した復水を復水器から給水系統に導く復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された水質の検出値の差に基づいて、前記給水系統に薬品希釈水を供給する薬注系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser includes a condensate condensing part having a heat transfer tube nest and condensing steam, a condensate condensing part partitioned from the condensate condensing part, and a condensate condensed in the condensate condensing part. A condensate communication part for guiding water to the condensate retention part, and a condensate outlet part for guiding the condensate retained in the condensate retention part from the condenser to the water supply system,
The condensate condensing unit is provided with a condensate communication unit for guiding the condensate condensed from the condensate condensing unit, or a first detection means for detecting the water quality of the condensate in the vicinity thereof. The second detection means for detecting the water quality of the condensate is installed at or near the condensate outlet for guiding the condensate accumulated in the condenser to the water supply system,
A condenser having a chemical injection system for supplying chemical dilution water to the water supply system based on a difference between detection values of water quality detected from the first and second detection means. タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮室と、該復水凝縮室と区画された復水滞留室と、前記復水凝縮室で凝縮された復水を前記復水滞留室に導く復水連絡部と、前記復水滞留室に滞留した復水を復水器から給水系統へ導く復水出口部とを有し、
前記復水滞留室に、前記復水凝縮部から凝縮された復水を導く復水連絡部、或いはその近傍に復水の水質を検出する第１の検出手段を設置し、前記復水凝縮室に滞留した復水を復水器から給水系統に導く復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された復水の水質の検出値の差に基づいて、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記給水系統に設置し、前記制御弁より下流側の該給水系統に補給水を供給する補給水系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser includes a condensate condensing chamber having a nest of heat transfer tubes and condensing steam, a condensate retention chamber partitioned from the condensate condensing chamber, and condensate condensed in the condensate condensing chamber. A condensate communication section for guiding the condensate retention chamber to the condensate retention chamber, and a condensate outlet section for guiding the condensate retained in the condensate retention chamber from the condenser to the water supply system,
In the condensate condensing chamber, a condensate communication unit for guiding the condensate condensed from the condensate condensing unit, or a first detection means for detecting the water quality of the condensate in the vicinity thereof is installed, and the condensate condensing chamber The second detection means for detecting the water quality of the condensate is installed at or near the condensate outlet for guiding the condensate accumulated in the condenser to the water supply system,
A control valve that adjusts the supply of condensate supplied from the condenser to the water supply system based on a difference between detected values of the water quality of the condensate detected from the first and second detection means; A condenser having a makeup water system installed in the system and configured to supply makeup water to the water supply system downstream from the control valve. タービンより流入する蒸気を凝縮し、この凝縮された復水を蒸気発生器に至る給水系統に供給する復水器において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮室と、該復水凝縮室と区画された復水滞留室と、前記復水凝縮室で凝縮された復水を前記復水滞留室に導く復水連絡部と、前記復水滞留室に滞留した復水を復水器から給水系統へ導く復水出口部とを有し、
前記復水滞留室に、前記復水凝縮部から凝縮された復水を導く復水連絡部、或いはその近傍に復水の水質を検出する第１の検出手段を設置し、前記復水凝縮室に滞留した復水を復水器から給水系統に導く復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された復水の水質の検出値の差に基づいて、前記給水系統に薬品希釈水を供給する薬注系統を備えたことを特徴とする復水器。In the condenser that condenses the steam flowing in from the turbine and supplies this condensed condensate to the water supply system leading to the steam generator,
The condenser includes a condensate condensing chamber having a nest of heat transfer tubes and condensing steam, a condensate retention chamber partitioned from the condensate condensing chamber, and condensate condensed in the condensate condensing chamber. A condensate communication section for guiding the condensate retention chamber to the condensate retention chamber, and a condensate outlet section for guiding the condensate retained in the condensate retention chamber from the condenser to the water supply system,
In the condensate condensing chamber, a condensate communication unit for guiding the condensate condensed from the condensate condensing unit, or a first detection means for detecting the water quality of the condensate in the vicinity thereof is installed, and the condensate condensing chamber The second detection means for detecting the water quality of the condensate is installed at or near the condensate outlet for guiding the condensate accumulated in the condenser to the water supply system,
A condenser comprising a chemical injection system for supplying chemical dilution water to the water supply system based on a difference between detected values of water quality of the condensate detected from the first and second detection means. . 前記復水器は、前記第１および第２の検出手段から検出される夫々の復水の水質の検出値の差を比較して、前記第１の検出手段で検出した水質の検出値が前記第２の検出手段で検出した水質の検出値より水質が低下した場合に海水漏洩を判断する判定装置を備えたことを特徴とする請求項４，５，６，７，８または９のいずれかに記載の復水器。The condenser compares the difference between the water quality detection values detected by the first and second detection means, and the water quality detection value detected by the first detection means The determination device for determining seawater leakage when the water quality is lower than the detected value of the water quality detected by the second detection means. The condenser as described in. 蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を凝縮して復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを備えた発電プラント設備において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、
前記複数個の検出器及び／又は検出口から検出された検出値に基づいて、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記復水系統に設置し、前記制御弁より下流側の該給水系統に連通し補給水を供給する補給水系統を備えたことを特徴とする発電プラント設備。A steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, a condenser for condensing the steam discharged from the steam turbine, and condensing the condensate In a power plant facility equipped with a water supply system that supplies steam generators,
The condenser includes a condensate condensing unit that has a heat transfer tube nest and condenses steam, and a condensate retaining unit that retains the condensate condensed in the condensate condensing unit, and the condensate retaining unit A plurality of detectors for detecting the water quality of the condensate and / or a plurality of detection ports for taking the condensate,
A control valve for adjusting the supply of condensate supplied from the condenser to the water supply system is installed in the condensate system based on detection values detected from the plurality of detectors and / or detection ports. A power plant facility comprising a makeup water system that communicates with the water system downstream from the control valve and supplies makeup water. 蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を凝縮して復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを備えた発電プラント設備において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部とを備え、前記復水滞留部に該復水の水質を検出する検出器及び／又は前記復水を取水する検出口を複数個設置し、
前記複数個の検出器及び／又は検出口から検出された水質の検出値に基づいて、前記給水系統に連通し薬品希釈水を供給する薬注系統を備えたことを特徴とする発電プラント設備。A steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, a condenser for condensing the steam discharged from the steam turbine, and condensing the condensate In a power plant facility equipped with a water supply system that supplies steam generators,
The condenser includes a condensate condensing unit that has a heat transfer tube nest and condenses steam, and a condensate retaining unit that retains the condensate condensed in the condensate condensing unit, and the condensate retaining unit A plurality of detectors for detecting the water quality of the condensate and / or a plurality of detection ports for taking the condensate,
A power plant facility, comprising: a chemical injection system that supplies chemical dilution water to the water supply system based on water quality detection values detected from the plurality of detectors and / or detection ports. 蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を凝縮して復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを備えた発電プラント設備において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部と、該復水滞留部に滞留した復水を復水器から該給水系統へ導く復水出口部とを備え、前記復水凝縮部を構成する伝熱管の管巣の直下の復水滞留部に該復水の水質を検出する第１の検出手段を設置し、前記復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された復水の水質の検出値の差に基づいて、復水の水質低下が生じた際に、前記復水器から前記給水系統に供給される復水の供給を調節する制御弁を前記給水系統に設置し、前記制御弁より下流側の該給水系統に連通し補給水を供給する補給水系統を備えたことを特徴とする発電プラント設備。A steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, a condenser for condensing the steam discharged from the steam turbine, and condensing the condensate In a power plant facility equipped with a water supply system that supplies steam generators,
The condenser has a heat transfer tube nest and condensate condensing part for condensing steam, condensate retaining part for retaining condensate condensed in the condensate condensing part, and retaining in the condensate retaining part. And a condensate outlet for guiding the condensate from the condenser to the water supply system, and detecting the quality of the condensate in the condensate retention part immediately below the nest of the heat transfer tube constituting the condensate condensing part Installing a first detection means, installing a second detection means for detecting the quality of the condensate water at or near the condensate outlet,
Based on the difference between the detected water quality values of the condensate detected from the first and second detection means, when the water quality of the condensate deteriorates, the condensate supplied from the condenser to the water supply system. A power plant facility, comprising a control valve for adjusting supply of water in the water supply system, and a supply water system that communicates with the water supply system downstream of the control valve and supplies supply water. 蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を凝縮して復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを備えた発電プラント設備において、
前記復水器は、伝熱管の管巣を有し蒸気を凝縮する復水凝縮部と、該復水凝縮部で凝縮した復水を滞留する復水滞留部と、該復水滞留部に滞留した復水を復水器から該給水系統へ導く復水出口部とを備え、前記復水凝縮部を構成する伝熱管の管巣の直下の復水滞留部に該復水の水質を検出する第１の検出手段を設置し、前記復水出口部、或いはその近傍に復水の水質を検出する第２の検出手段を設置し、
前記第１および第２の検出手段から検出された復水の水質の検出値の差に基づいて、復水の水質低下が生じた際に、前記給水系統に連通し薬品希釈水を供給する薬注系統を備えたことを特徴とする発電プラント設備。A steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, a condenser for condensing the steam discharged from the steam turbine, and condensing the condensate In a power plant facility equipped with a water supply system that supplies steam generators,
The condenser has a heat transfer tube nest and condensate condensing part for condensing steam, condensate retaining part for retaining condensate condensed in the condensate condensing part, and retaining in the condensate retaining part. And a condensate outlet for guiding the condensate from the condenser to the water supply system, and detecting the quality of the condensate in the condensate retention part immediately below the nest of the heat transfer tube constituting the condensate condensing part Installing a first detection means, installing a second detection means for detecting the quality of the condensate water at or near the condensate outlet,
A medicine that supplies chemical dilution water in communication with the water supply system when the water quality of the condensate deteriorates based on the difference between the detected values of the water quality of the condensate detected from the first and second detection means. A power plant facility characterized by an injection system. 前記発電プラント設備は、補給水が貯水された補給水タンクと、前記補給水タンクに貯水された補給水を前記復水器、或いは前記給水系統に供給する補給水供給装置とを備えたことを特徴とする請求項１１または１３に記載の発電プラント設備。The power plant facility includes a makeup water tank in which makeup water is stored, and a makeup water supply device that supplies makeup water stored in the makeup water tank to the condenser or the water supply system. The power plant equipment according to claim 11 or 13, characterized by the above. 前記発電プラント設備は、海水が混入した復水を中和する薬品希釈水を貯蔵する薬品貯蔵タンクと、前記薬品貯蔵タンクに貯蔵された薬品希釈水を前記復水器、或いは前記給水系統に供給する薬品希釈水供給装置とを備えたことを特徴とする請求項１２または１４に記載の発電プラント設備。The power plant equipment supplies a chemical storage tank that stores chemical dilution water that neutralizes the condensate mixed with seawater, and supplies the chemical dilution water stored in the chemical storage tank to the condenser or the water supply system. The power plant equipment according to claim 12 or 14, further comprising a chemical dilution water supply device. 前記発電プラント設備は、前記蒸気発生器へ供給される復水の流量を制御する制御弁より上流側に復水を給水系統外に排出する排出系統を備えたことを特徴とする請求項１１または１３に記載の発電プラント設備。The said power plant equipment is equipped with the discharge system which discharges condensate outside a feed water system in the upstream from the control valve which controls the flow volume of the condensate supplied to the said steam generator. 13. The power plant equipment according to 13. 蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを有する発電プラント設備の運転方法において、
前記復水器内で凝縮した復水を滞留する復水滞留部の複数箇所で復水の水質を検出し、この複数の検出点で検出される水質の検出値に基づいて海水漏洩を判定し、
海水漏洩と判定された場合に、前記給水系統に設置された制御弁を操作して前記復水器から前記給水系統に供給される復水の供給を調節し、更に、前記制御弁より下流側の該給水系統に連通した補給水系統から補給水を該給水系統に供給することを特徴とする発電プラント設備の運転方法。A steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, a condenser for condensing steam discharged from the steam turbine, and the condensate for the steam generator In the operation method of power plant equipment having a water supply system to supply
Condensate water quality is detected at multiple locations of the condensate reservoir where the condensate condensed in the condenser is retained, and seawater leakage is determined based on the water quality detection values detected at the multiple detection points. ,
When it is determined that the seawater leaks, the control valve installed in the water supply system is operated to adjust the supply of condensate supplied from the condenser to the water supply system, and further downstream from the control valve. A method for operating a power plant facility, wherein makeup water is supplied to a water supply system from a makeup water system communicating with the water supply system. 蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを有する発電プラント設備の運転方法において、
前記復水器内で凝縮した復水を滞留する復水滞留部の複数箇所で復水の水質を検出し、この複数の検出点で検出される水質の検出値に基づいて海水漏洩を判定し、
海水漏洩が判定された場合に、前記給水系統に薬品希釈水を供給することを特徴とする発電プラント設備の運転方法。A steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, a condenser for condensing steam discharged from the steam turbine, and the condensate for the steam generator In the operation method of power plant equipment having a water supply system to supply
Condensate water quality is detected at multiple locations of the condensate reservoir where the condensate condensed in the condenser is retained, and seawater leakage is determined based on the water quality detection values detected at the multiple detection points. ,
A method of operating a power plant facility, wherein chemical dilution water is supplied to the water supply system when seawater leakage is determined. 蒸気を発生させる蒸気発生器と、該蒸気発生器で発生した蒸気により駆動される蒸気タービンと、該蒸気タービンから排出される蒸気を復水する復水器と、前記復水を前記蒸気発生器に供給する給水系統とを有する発電プラント設備の運転方法において、
前記復水器内で凝縮した復水を滞留する復水滞留部の複数箇所で復水の水質を検出し、この複数の検出点で検出される水質の検出値に基づいて海水漏洩を判定し、
海水漏洩と判定された場合に、前記給水系統に設置された制御弁を操作して前記復水器から前記給水系統に供給される復水の供給を調節し、前記制御弁より下流側の該給水系統に連通した補給水系統から補給水を該給水系統に供給し、更に、前記給水系統に薬品希釈水を供給することを特徴とする発電プラント設備の運転方法。A steam generator for generating steam, a steam turbine driven by the steam generated by the steam generator, a condenser for condensing steam discharged from the steam turbine, and the condensate for the steam generator In the operation method of power plant equipment having a water supply system to supply
Condensate water quality is detected at multiple locations of the condensate reservoir where the condensate condensed in the condenser is retained, and seawater leakage is determined based on the water quality detection values detected at the multiple detection points. ,
When it is determined that there is seawater leakage, the control valve installed in the water supply system is operated to adjust the supply of condensate supplied from the condenser to the water supply system, and the downstream side of the control valve A method of operating a power plant facility, wherein makeup water is supplied from a makeup water system communicating with the water supply system to the water supply system, and further, chemical dilution water is supplied to the water supply system. 前記発電プラント設備の運転方法は、海水漏洩と判定された場合、海水が混入した復水を復水器から蒸気発生器へ導く流路の途中で前記給水系統外に排出することを特徴とする請求項１８，１９または２０のいずれかに記載の発電プラント設備の運転方法。The operation method of the power plant equipment is characterized in that when it is determined that the seawater leaks, the condensate mixed with seawater is discharged out of the water supply system in the middle of the flow path leading from the condenser to the steam generator. The operation method of the power plant equipment in any one of Claim 18, 19 or 20. 前記発電プラント設備の運転方法は、前記復水器内で凝縮した復水が滞留する復水滞留部の上流側から、該給水系統に復水を流出する復水滞留部の下流側に至る経路の離間する位置にて復水の水質を夫々検出し、これら検出点から検出される夫々の水質の検出値を比較して、上流側の検出点で検出した水質の検出値が下流側の検出点で検出した水質の検出値より水質が低下した場合に海水漏洩を判断することを特徴とする請求項１８，１９または２０のいずれかに記載の発電プラント設備の運転方法。The operation method of the power plant equipment is a path from the upstream side of the condensate retention part where condensate condensed in the condenser stays to the downstream side of the condensate retention part that flows out condensate into the water supply system. The water quality of the condensate is detected at the positions separated from each other, and the water quality detection values detected from these detection points are compared, and the detection value of the water quality detected at the upstream detection point is detected downstream. 21. The operating method of power plant equipment according to claim 18, wherein seawater leakage is determined when the water quality is lower than a detected water quality value at a point. 前記発電プラント設備の運転方法は、前記復水器内で凝縮した復水が滞留する復水滞留部の上流側から、該給水系統に復水を流出する復水滞留部の下流側に至る経路の離間する位置にて復水の水質を夫々検出し、これら検出点から検出される夫々の水質の検出値を比較して、上流側の検出点で検出した水質の検出値が下流側の検出点で検出した水質の検出値より大きい場合に海水漏洩を判断することを特徴とする請求項２２，２３または２４のいずれかに記載の発電プラント設備の運転方法。The operation method of the power plant equipment is a path from the upstream side of the condensate retention part where condensate condensed in the condenser stays to the downstream side of the condensate retention part that flows out condensate into the water supply system. The water quality of the condensate is detected at the positions separated from each other, and the water quality detection values detected from these detection points are compared, and the detection value of the water quality detected at the upstream detection point is detected downstream. 25. A method for operating a power plant according to any one of claims 22, 23 and 24, wherein seawater leakage is determined when the detected water quality value is larger than a point. 前記発電プラント設備の運転方法は、前記復水器内で凝縮した復水が滞留する復水滞留部の上流側から、該給水系統に復水を流出する復水滞留部の下流側に至る経路の離間する位置にて復水の水質を夫々検出し、これら検出点から検出される夫々の水質の検出値の差が所定値を超えた場合に海水漏洩を判断することを特徴とする請求項２２，２３または２４のいずれかに記載の発電プラント設備の運転方法。The operation method of the power plant equipment is a path from the upstream side of the condensate retention part where condensate condensed in the condenser stays to the downstream side of the condensate retention part that flows out condensate into the water supply system. The water quality of the condensate is respectively detected at positions separated from each other, and seawater leakage is determined when the difference between the detected values of the water quality detected from these detection points exceeds a predetermined value. The operation method of the power plant equipment in any one of 22, 23, or 24.
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