JP4166540B2

JP4166540B2 - Steam control valve controller

Info

Publication number: JP4166540B2
Application number: JP2002272649A
Authority: JP
Inventors: 健小林
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2002-09-19
Filing date: 2002-09-19
Publication date: 2008-10-15
Anticipated expiration: 2022-09-19
Also published as: JP2004108965A

Description

【０００１】
【発明の属する技術分野】
本発明は、原子炉への給水が停止するなどの緊急時に冷却水を供給するための給水ポンプを駆動する蒸気タービンの蒸気入口側に設けられた蒸気加減弁を駆動制御する蒸気加減弁制御装置に関する。
【０００２】
【従来の技術】
原子炉への給水が停止するなどの緊急時に冷却水を供給するための給水ポンプを駆動するための蒸気タービンは通常時停止している。しかし、原子炉冷却水の水位が下がった場合には、このような蒸気タービンで駆動される給水ポンプは急速に起動されて冷却水を原子炉に供給するようになっている。
【０００３】
図６は従来の蒸気加減弁制御装置の概略構成を示す系統図である。すなわち、給水ポンプ駆動用蒸気タービン３の蒸気入口には蒸気止め弁４と蒸気加減弁５が設置されている。蒸気止め弁４は通常時は閉止しているが、原子炉１の水位が下がったことを検出して電動で弁が開く構成となっている。蒸気加減弁５は、弁棒に設置された蒸気加減弁全開用ばね１５で通常時は全開しているが、蒸気止め弁４が開くことによって給水ポンプ駆動用蒸気タービン３に原子炉１からの蒸気が流入して蒸気タービン３の回転速度が上昇すると、給水及びタービン速度を制御するために蒸気加減弁５が全開から閉止する方向に徐々に制御される。
【０００４】
蒸気タービン３が回転すると、その軸を動力として駆動される潤滑油ポンプ７が作動して蒸気タービン軸受１９に潤滑油を供給する。その潤滑油の一部は、蒸気タービン３の軸を動力として駆動される制御油ポンプ８で昇圧されて制御油となり、電油変換器１２により後述する制御信号に基づいて油圧シリンダー１３を駆動する。そしてこの油圧シリンダー１３のピストンとリンク機構により接続された蒸気加減弁５の弁棒が駆動されることにより、その開度が制御される。
【０００５】
給水及びタービン速度制御装置１０は、図７の制御ブロック図に示すように、給水速度指令信号で要求される蒸気タービン回転速度と、タービン軸に設置された速度検出器１１の出力信号とを比較演算して、その偏差信号を電油変換器１２に送出する。
【０００６】
給水ポンプ駆動用蒸気タービン３は電気動力を使用せず、流入する蒸気のエネルギーのみを使用して潤滑と制御を行うようにタービン駆動のポンプを組み合わせた系統構成となっている。また、これらの駆動装置は機器の制約上、タービンの基礎ベース内に設置された油タンク６の上部に設置されているため、油圧系統の途中に空気が入った場合、蒸気タービン３が起動して油圧が確立されるまで空気が抜けにくい。
【０００７】
【発明が解決しようとする課題】
従来の蒸気加減弁制御装置においては、油系統内に空気が流入した場合に空気の圧縮により動作の遅れが生じるため、給水ポンプ駆動用蒸気タービンは、起動時の過渡的回転速度が高くなりやすい。過渡的回転速度が高いと、安定するまでに時間がかかり、給水ポンプ２が定格状態に達するまでの時間が長くなり、急速に起動して冷却水を原子炉に給水することができない。
【０００８】
このように、従来の蒸気加減弁制御装置は、油圧系統内に空気が入った場合に給水ポンプ駆動用蒸気タービンの起動特性が悪くなり、緊急時に駆動する蒸気タービンとしての安定的な運用を行うことができない。
【０００９】
そこで本発明は、蒸気加減弁を駆動制御する油圧系統内に空気が入ることを防ぎ、万一空気が入ってしまった場合でも、給水ポンプ駆動用蒸気タービンの起動特性を悪化させることのない蒸気加減弁制御装置を提供することを目的とする。
【００１０】
【課題を解決するための手段】
請求項１の発明は、原子炉に緊急に冷却水を供給する給水ポンプを駆動する給水ポンプ駆動用蒸気タービンと、油タンクの出口側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動される潤滑油ポンプと、この潤滑油ポンプの下流側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動されるとともに前記潤滑油ポンプからの吐出油の圧力を昇圧する制御油ポンプと、この制御油ポンプの下流側に設けられ前記制御油の吐出油の流量を、前記給水ポンプ駆動用蒸気タービンの実速度信号と給水速度指令信号とを入力信号とする給水及びタービン速度制御装置からの出力である電油変換器入力信号に基づいて制御する電油変換器と、この電油変換器と前記油タンクを結ぶ排油ラインと、前記電油変換器の下流側に設けられた油圧シリンダーと、この油圧シリンダーに接続され前記給水ポンプ駆動用蒸気タービンの蒸気入口側に設置された蒸気加減弁とを備えた蒸気加減弁制御装置において、前記制御油ポンプ上流側にこの油系統内に混入した空気を除去する給油ドレンポットを設けるとともに、このドレンポットからオリフィスを介して前記油タンクに接続されるバイパス系統を設けたことを特徴とする。
【００１１】
本発明によれば、油系統に空気が混入した場合においても、油系統を起動した際に給油ドレンポットにて空気が系外に放出され空気を油系統から抜くことができ、空気混入による蒸気タービン起動時の過渡的回転速度上昇を防止することができる。
【００１２】
請求項２の発明は、原子炉に緊急に冷却水を供給する給水ポンプを駆動する給水ポンプ駆動用蒸気タービンと、油タンクの出口側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動される潤滑油ポンプと、この潤滑油ポンプの下流側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動されるとともに前記潤滑油ポンプからの吐出油の圧力を昇圧する制御油ポンプと、この制御油ポンプの下流側に設けられ前記制御油の吐出油の流量を、前記給水ポンプ駆動用蒸気タービンの実速度信号と給水速度指令信号とを入力信号とする給水及びタービン速度制御装置からの出力である前記電油変換器入力信号に基づいて制御する電油変換器と、この電油変換器と前記油タンクを結ぶ排油ラインと、電油変換器の下流側に設けられた油圧シリンダーと、この油圧シリンダーに接続され前記給水ポンプ駆動用蒸気タービンの蒸気入口側に設置された蒸気加減弁とを備えた蒸気加減弁制御装置において、前記排油ラインにこの油系統内に混入した空気を除去する排油ドレンポットを設けたことを特徴とする。
【００１３】
本発明によれば、油系統に空気が混入した場合においても、油系統を起動した際に排油ドレンポットにて空気が系外に放出され空気を油系統から抜くことができ、空気混入による蒸気タービン起動時の過渡的回転速度上昇を防止することができる。
【００１４】
請求項３の発明は、原子炉に緊急に冷却水を供給する給水ポンプを駆動する給水ポンプ駆動用蒸気タービンと、油タンクの出口側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動される潤滑油ポンプと、この潤滑油ポンプの下流側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動されるとともに前記潤滑油ポンプからの吐出油の圧力を昇圧する制御油ポンプと、この制御油ポンプの下流側に設けられ前記制御油の吐出油の流量を、前記給水ポンプ駆動用蒸気タービンの実速度信号と給水速度指令信号とを入力信号とする給水及びタービン速度制御装置からの出力である電油変換器入力信号に基づいて制御する電油変換器と、この電油変換器と前記油タンクを結ぶ排油ラインと、前記電油変換器の下流側に設けられた油圧シリンダーと、この油圧シリンダーに接続され前記給水ポンプ駆動用蒸気タービンの蒸気入口側に設置された蒸気加減弁とを備えた蒸気加減弁制御装置において、前記油圧シリンダーのピストンにこの油系統内に混入した空気を除去するオリフィスを設けたことを特徴とする。
【００１５】
本発明によれば、油圧シリンダーのピストン下部に溜まった空気をオリフィスからピストン上部を経由して抜くことができるため、油系統への空気混入による蒸気タービン起動時の過渡的回転速度上昇を防止することができる。
【００１８】
請求項４の発明は、原子炉に緊急に冷却水を供給する給水ポンプを駆動する給水ポンプ駆動用蒸気タービンと、油タンクの出口側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動される潤滑油ポンプと、この潤滑油ポンプの下流側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動されるとともに前記潤滑油ポンプからの吐出油の圧力を昇圧する制御油ポンプと、この制御油ポンプの下流側に設けられ前記制御油の吐出油の流量を、前記給水ポンプ駆動用蒸気タービンの実速度信号と給水速度指令信号とを入力信号とする給水及びタービン速度制御装置からの出力である電油変換器入力信号に基づいて制御する電油変換器と、この電油変換器と前記油タンクを結ぶ排油ラインと、前記電油変換器の下流側に設けられた油圧シリンダーと、この油圧シリンダーに接続され前記給水ポンプ駆動用蒸気タービンの蒸気入口側に設置された蒸気加減弁とを備えた蒸気加減弁制御装置において、前記給水及びタービン速度制御装置は、給水ポンプ駆動用蒸気タービン起動信号が入った直後の数秒間に亘り、前記給水ポンプ駆動用蒸気タービンの実速度信号と給水速度指令信号に代わり、蒸気加減弁急閉信号を入力信号とすることを特徴とする。
【００１９】
本発明によれば、給水ポンプ駆動用蒸気タービン駆動信号が入っても、その直後に蒸気加減弁を閉じるので、急速に蒸気タービンが速度上昇することが無くなり、蒸気タービンを短時間に定回転数に制御することが可能となる。
【００２０】
請求項５の発明は、原子炉に緊急に冷却水を供給する給水ポンプを駆動する給水ポンプ駆動用蒸気タービンと、油タンクの出口側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動される潤滑油ポンプと、この潤滑油ポンプの下流側に設けられ前記給水ポンプ駆動用蒸気タービンにより駆動されるとともに前記潤滑油ポンプからの吐出油の圧力を昇圧する制御油ポンプと、この制御油ポンプの下流側に設けられ前記制御油の吐出油の流量を、前記給水ポンプ駆動用蒸気タービンの実速度信号と給水速度指令信号とを入力信号とする給水及びタービン速度制御装置からの出力である電油変換器入力信号に基づいて制御する電油変換器と、この電油変換器と前記油タンクを結ぶ排油ラインと、前記電油変換器の下流側に設けられた油圧シリンダーと、この油圧シリンダーに接続され前記給水ポンプ駆動用蒸気タービンの蒸気入口側に設置された蒸気加減弁とを備えた蒸気加減弁制御装置において、前記給水及びタービン速度制御装置は、入力されたタービン実速度信号に進み信号を加えて先行実速度信号として出力させる進み／遅れ回路を備えたことを特徴とする。
【００２１】
本発明によれば、蒸気タービンの実回転数より予め先行させた信号で蒸気加減弁の制御を行うため、蒸気タービンを短時間に定回転数に制御することが可能となる。
【００２２】
【発明の実施の形態】
図１は本発明の第１の実施の形態の蒸気加減弁制御装置の系統図である。すなわち、制御油ポンプ８の上流側にオリフィス１４を備えた給油ドレンポット９を設置し、制御油ポンプ８、電油変換器１２及び油圧シリンダー１３よりも高い位置に設置した構成である。
【００２３】
給油ドレンポット９は蒸気加減弁５の緊急時の閉止に油圧シリンダー１３が動作するに必要な容量以上の油が溜められており、蒸気タービン３が急速に起動して回転速度が上昇した時に給油ドレンポット９の中の油を制御油ポンプ８に給油することができる。また、潤滑油ポンプ７の容量は制御油ポンプ８及び蒸気タービン３の軸受で使用される容量よりも大きいため、油系統内に空気が入っている場合であっても起動時に給油ドレンポット９のオリフィス１４を経由して空気が自動的に押し出されて抜くことができる。
【００２４】
この構成であると、制御油ポンプ８の上流側に入った空気は給油ドレンポット９に溜まる。そして給油ドレンポット９の最下部の油が制御油ポンプ８に給油されるため制御油ポンプ８側には空気が混入しない。また、油系統内に混入した空気は蒸気タービン３の停止時に給油ドレンポット９の上部に溜まる。この空気はタービンの起動時にドレンポットの空気抜きオリフィス１４を経由して抜かれる。
【００２５】
本実施の形態の蒸気加減弁制御装置における蒸気加減弁５のストロークＳ、および蒸気タービン３の回転速度Ｎの経時変化は図２のようになる。蒸気加減弁５のストロークＳは従来の技術におけるよりも早く閉動作し、蒸気タービン３の回転速度Ｎは従来の技術よりも過上昇が少ないことが分かる。
【００２６】
このように本実施の形態の蒸気加減弁制御装置においては、制御油ポンプ８の上流側に空気抜き用の給油ドレンポット９を設置して、油系統内に混入した空気は電油変換器１２及び油圧シリンダー１３側に入らないように除去し、空気混入による蒸気弁の動作遅れを防止することができる。すなわち、油系統内の空気が抜かれるため、蒸気加減弁５の動作遅れがなくなり、給水ポンプ駆動用蒸気タービン３の起動時の回転数の過渡的上昇が少なくなる。
【００２７】
図３は本発明の第２の実施の形態の要部を示し、電油変換器１２と油タンク７６を結ぶ排油系統２０に排油ドレンポット１６を設置した構成である。他の構成は従来技術（図６）と同じである。この実施の形態では、排油系統にドレンポット１６を設置し、制御油ポンプ８、電油変換器１２及び油圧シリンダー１３よりも高い位置に置くことによって、空気が排油系統に溜まらないようにすることができる。
【００２８】
図４は本発明の第３の実施の形態の要部を示し、油圧シリンダー１３に空気が溜まらないようにしたものである。
図４（ａ）は、油圧シリンダー１３のピストン部分に空気抜きオリフィス１７を設け、シリンダーの下部に溜まった空気はシリンダーの上部を経由して排出される。図４（ｂ）では油圧シリンダー１３のピストンをラビリンス構造１８としてラビリンス構造とシリンダー内壁との間から下に溜まった空気を排出するようにしている。
【００２９】
この実施の形態においては、オリフィス１７やラビリンス構造１８から洩れる油量は油圧シリンダー１３への給油量に比較して十分に少なくし、これらの構造による動作遅れがないような構成にする。
【００３０】
図５は本発明の第４の実施の形態の要部を示す。
図５（ａ）は、給水及びタービン速度制御装置１０に蒸気タービン３起動時の数秒のみ蒸気加減弁全閉信号が入力信号となるようにした構成のブロック図である。蒸気タービン３が回転上昇する前に蒸気タービン３の起動信号が入力された時点で蒸気加減弁急閉信号を与えて蒸気加減弁５を強制的に閉止させる。このようにすることによって、蒸気タービン３の回転速度が上がってきてから蒸気加減弁５を制御する場合に比べ早い段階で閉止信号が入るため、蒸気タービン３の過渡的回転速度をより低く抑えることができ、短時間で定回転数に制御することができる。
【００３１】
図５（ｂ）は、給水及びタービン速度制御装置１０の速度検出器１１からのタービン実速度信号１１ａの入力部に進み遅れ回路を設置して進み定数を大きく設定したものである。この構成によっても、図５（ａ）と同様に蒸気タービン３の実回転速度に先行して速度制御を行うことができるので短時間で定回転数に制御することができる。なお、図５（ａ），（ｂ）を組み合わせた制御回路でも同様な効果を得ることができる。
【００３２】
【発明の効果】
本発明の蒸気加減弁制御装置によれば、油系統内への空気の混入を防ぎ、万一空気が混入した場合でも、原子炉に緊急時に冷却水を供給する給水ポンプを駆動する蒸気タービンの動作遅れを少なくして安定に起動することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の蒸気加減弁制御装置を示す系統図。
【図２】上記第１の実施の形態の蒸気加減弁制御装置の動作を説明する図。
【図３】本発明の第２の実施の形態の蒸気加減弁制御装置の要部を示す系統図。
【図４】本発明の第３の実施の形態の蒸気加減弁制御装置の要部を示す図。
【図５】本発明の第４の実施の形態の蒸気加減弁制御装置を示し、（ａ），（ｂ）はそれぞれ異なる給水及びタービン速度制御装置の実施例を示すブロック図。
【図６】従来の蒸気加減弁制御装置を示す系統図。
【図７】従来の蒸気加減弁制御装置における給水及びタービン速度制御装置のブロック図。
【符号の説明】
１…原子炉、２…給水ポンプ、３…給水ポンプ駆動用蒸気タービン、４…蒸気止め弁、５…蒸気加減弁、６…油タンク、７…潤滑油ポンプ、８…制御油ポンプ、９…給油ドレンポット、１０…給水及びタービン速度制御装置、１１…速度検出器、１１ａ…タービン実速度信号、１２…電油変換器、１３…油圧シリンダー、１４…空気抜きオリフィス、１５…蒸気加減弁全開用ばね、１６…排油ドレンポット、１７…空気抜きオリフィス、１８…ラビリンス構造、１９…軸受、２０…排油系統、２１…バイパス系統。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam control valve control device that drives and controls a steam control valve provided on a steam inlet side of a steam turbine that drives a water supply pump for supplying cooling water in an emergency such as when water supply to a nuclear reactor stops. About.
[0002]
[Prior art]
A steam turbine for driving a water supply pump for supplying cooling water in an emergency such as when water supply to a nuclear reactor stops is normally stopped. However, when the water level of the reactor cooling water falls, the feed water pump driven by such a steam turbine is rapidly activated to supply cooling water to the reactor.
[0003]
FIG. 6 is a system diagram showing a schematic configuration of a conventional steam control valve control device. That is, the steam stop valve 4 and the steam control valve 5 are installed at the steam inlet of the steam turbine 3 for driving the feed water pump. The steam stop valve 4 is normally closed, but is configured to open the valve electrically by detecting that the water level of the reactor 1 has dropped. The steam control valve 5 is normally fully opened by a steam control valve full-opening spring 15 installed on the valve rod. However, when the steam stop valve 4 is opened, the steam turbine 3 for driving the feed water pump is supplied from the reactor 1. When the steam flows in and the rotational speed of the steam turbine 3 increases, the steam control valve 5 is gradually controlled from the fully open position to the closed position in order to control the feed water and the turbine speed.
[0004]
When the steam turbine 3 rotates, the lubricating oil pump 7 driven with its shaft as power operates to supply the lubricating oil to the steam turbine bearing 19. A part of the lubricating oil is boosted by a control oil pump 8 driven by the shaft of the steam turbine 3 as power and becomes control oil, and the electric oil converter 12 drives the hydraulic cylinder 13 based on a control signal described later. . And the opening degree is controlled by driving the valve rod of the steam control valve 5 connected to the piston of the hydraulic cylinder 13 by the link mechanism.
[0005]
As shown in the control block diagram of FIG. 7, the feed water and turbine speed control device 10 compares the steam turbine rotation speed required by the feed water speed command signal with the output signal of the speed detector 11 installed on the turbine shaft. It calculates and sends the deviation signal to the electro-oil converter 12.
[0006]
The feed water pump drive steam turbine 3 has a system configuration in which a turbine drive pump is combined so as to perform lubrication and control using only the energy of the incoming steam without using electric power. In addition, these drive units are installed on the upper part of the oil tank 6 installed in the foundation base of the turbine due to equipment limitations, so that when the air enters the hydraulic system, the steam turbine 3 starts. Air is difficult to escape until hydraulic pressure is established.
[0007]
[Problems to be solved by the invention]
In the conventional steam control valve control device, when air flows into the oil system, the operation is delayed due to the compression of the air. Therefore, the steam turbine for driving the feedwater pump tends to have a high transient rotational speed at startup. . If the transient rotational speed is high, it takes time to stabilize, the time until the feed water pump 2 reaches the rated state becomes long, and it is not possible to start up rapidly and supply cooling water to the reactor.
[0008]
As described above, the conventional steam control valve control device performs stable operation as a steam turbine that is driven in an emergency because the startup characteristics of the steam turbine for driving the feedwater pump deteriorate when air enters the hydraulic system. I can't.
[0009]
Therefore, the present invention prevents the entry of air into the hydraulic system that drives and controls the steam control valve, and the steam that does not deteriorate the start-up characteristics of the steam turbine for driving the feed water pump even if the air enters. An object of the present invention is to provide a control valve control device.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a feed water pump driving steam turbine for driving a feed water pump for urgently supplying cooling water to a nuclear reactor, and lubrication provided on the outlet side of an oil tank and driven by the feed water pump driving steam turbine. An oil pump, a control oil pump provided on the downstream side of the lubricating oil pump, driven by the steam turbine for driving the feed water pump and boosting the pressure of the discharge oil from the lubricating oil pump, and downstream of the control oil pump The oil-oil conversion is the output from the feed water and turbine speed control device with the flow rate of the discharge oil of the control oil provided on the side as input signals of the actual speed signal and the feed water speed command signal of the steam turbine for driving the feed water pump An electro-hydraulic converter that is controlled on the basis of an input signal from the converter, an oil discharge line that connects the electro-oil converter and the oil tank, and a hydraulic sill provided downstream of the electro-oil converter. And a steam control valve controller connected to the hydraulic cylinder and installed on the steam inlet side of the steam turbine for driving the feed water pump, in the oil system upstream of the control oil pump. An oil supply drain pot for removing the mixed air is provided, and a bypass system connected from the drain pot to the oil tank via an orifice is provided.
[0011]
According to the present invention, even when air is mixed into the oil system, when the oil system is started, the air is discharged out of the system by the oil supply drain pot, and the air can be extracted from the oil system. It is possible to prevent a transient increase in rotational speed when the turbine is started.
[0012]
According to a second aspect of the present invention, there is provided a feed water pump driving steam turbine for driving a feed water pump for urgently supplying cooling water to a nuclear reactor, and lubrication provided on the outlet side of an oil tank and driven by the feed water pump driving steam turbine. An oil pump, a control oil pump provided on the downstream side of the lubricating oil pump, driven by the steam turbine for driving the feed water pump and boosting the pressure of the discharge oil from the lubricating oil pump, and downstream of the control oil pump The electric oil which is an output from the feed water and turbine speed control device having the flow rate of the discharge oil of the control oil provided on the side and the actual speed signal of the steam turbine for driving the feed water pump and the feed water speed command signal as input signals An electro-oil converter that is controlled based on the converter input signal, an oil discharge line that connects the electro-oil converter and the oil tank, and a hydraulic sill provided downstream of the electro-oil converter. And a steam control valve control device provided with a steam control valve connected to the hydraulic cylinder and installed on the steam inlet side of the steam turbine for driving the feed water pump. A drain oil drain pot for removing air is provided.
[0013]
According to the present invention, even when air is mixed into the oil system, when the oil system is started, the air is discharged out of the system by the drain oil drain pot, and the air can be extracted from the oil system. It is possible to prevent a transient increase in rotational speed when starting up the steam turbine.
[0014]
According to a third aspect of the present invention, there is provided a feed water pump driving steam turbine for driving a feed water pump for urgently supplying cooling water to a nuclear reactor, and lubrication provided on the outlet side of an oil tank and driven by the feed water pump driving steam turbine. An oil pump, a control oil pump provided on the downstream side of the lubricating oil pump, driven by the steam turbine for driving the feed water pump and boosting the pressure of the discharge oil from the lubricating oil pump, and downstream of the control oil pump The oil-oil conversion is the output from the feed water and turbine speed control device with the flow rate of the discharge oil of the control oil provided on the side as input signals of the actual speed signal and the feed water speed command signal of the steam turbine for driving the feed water pump An electro-hydraulic converter that is controlled on the basis of an input signal from the converter, an oil discharge line that connects the electro-oil converter and the oil tank, and a hydraulic sill provided downstream of the electro-oil converter. And a steam control valve control device provided with a steam control valve connected to the hydraulic cylinder and installed on the steam inlet side of the steam turbine for driving the feed water pump. It is characterized in that an orifice for removing the air is provided.
[0015]
According to the present invention, since air accumulated in the lower part of the piston of the hydraulic cylinder can be extracted from the orifice via the upper part of the piston, a transient rotational speed increase at the start of the steam turbine due to air mixing into the oil system is prevented. be able to.
[0018]
According to a fourth aspect of the present invention, there is provided a feed water pump driving steam turbine for driving a feed water pump for urgently supplying cooling water to a nuclear reactor, and lubrication provided on the outlet side of the oil tank and driven by the feed water pump driving steam turbine. An oil pump, a control oil pump provided on the downstream side of the lubricating oil pump, driven by the steam turbine for driving the feed water pump and boosting the pressure of the discharge oil from the lubricating oil pump, and downstream of the control oil pump The oil-oil conversion is the output from the feed water and turbine speed control device with the flow rate of the discharge oil of the control oil provided on the side as input signals of the actual speed signal and the feed water speed command signal of the steam turbine for driving the feed water pump An electro-hydraulic converter that is controlled on the basis of an input signal from the converter, an oil discharge line that connects the electro-oil converter and the oil tank, and a hydraulic sill provided downstream of the electro-oil converter. And a steam control valve control device comprising a steam control valve connected to the hydraulic cylinder and installed on the steam inlet side of the steam turbine for driving the feed water pump, wherein the feed water and the turbine speed control device are driven by the feed water pump. A steam control valve rapid closing signal is used as an input signal instead of the actual speed signal and the feed water speed command signal of the steam turbine for driving the feed water pump for a few seconds immediately after the start of the steam turbine start signal. .
[0019]
According to the present invention, even if a steam turbine drive signal for driving the feed water pump is input, the steam control valve is closed immediately after that, so that the steam turbine does not rapidly increase in speed, and the steam turbine is kept at a constant rotational speed in a short time. It becomes possible to control to.
[0020]
The invention according to claim 5 is a feed water pump driving steam turbine for driving a feed water pump for urgently supplying cooling water to a nuclear reactor, and lubrication provided on the outlet side of the oil tank and driven by the feed water pump driving steam turbine. An oil pump, a control oil pump provided on the downstream side of the lubricating oil pump, driven by the steam turbine for driving the feed water pump and boosting the pressure of the discharge oil from the lubricating oil pump, and downstream of the control oil pump The oil-oil conversion is the output from the feed water and turbine speed control device with the flow rate of the discharge oil of the control oil provided on the side as input signals of the actual speed signal and the feed water speed command signal of the steam turbine for driving the feed water pump An electro-hydraulic converter that is controlled on the basis of an input signal from the converter, an oil discharge line that connects the electro-oil converter and the oil tank, and a hydraulic sill provided downstream of the electro-oil converter. And a steam control valve control device comprising a steam control valve connected to the hydraulic cylinder and installed on the steam inlet side of the steam turbine for driving the feed water pump, wherein the feed water and turbine speed control device are input A lead / delay circuit is provided which adds a lead signal to the turbine actual speed signal and outputs the result as a preceding actual speed signal.
[0021]
According to the present invention, since the steam control valve is controlled with a signal that precedes the actual rotational speed of the steam turbine, the steam turbine can be controlled to a constant rotational speed in a short time.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a system diagram of a steam control valve control apparatus according to a first embodiment of the present invention. In other words, an oil supply drain pot 9 having an orifice 14 is installed on the upstream side of the control oil pump 8, and is installed at a position higher than the control oil pump 8, the electric oil converter 12 and the hydraulic cylinder 13.
[0023]
The oil supply drain pot 9 stores oil more than the capacity necessary for the hydraulic cylinder 13 to operate when the steam control valve 5 is closed in an emergency, and oil supply occurs when the steam turbine 3 starts up rapidly and the rotational speed increases. The oil in the drain pot 9 can be supplied to the control oil pump 8. In addition, since the capacity of the lubricating oil pump 7 is larger than the capacity used by the bearings of the control oil pump 8 and the steam turbine 3, the oil supply drain pot 9 is activated at the start-up even when air is contained in the oil system. Air can be automatically pushed out through the orifice 14 and extracted.
[0024]
With this configuration, the air that has entered the upstream side of the control oil pump 8 accumulates in the oil supply drain pot 9. And since the oil of the lowest part of the oil supply drain pot 9 is supplied to the control oil pump 8, air does not mix in the control oil pump 8 side. Further, the air mixed in the oil system is accumulated in the upper portion of the oil supply drain pot 9 when the steam turbine 3 is stopped. This air is extracted through the air vent orifice 14 of the drain pot when the turbine is started.
[0025]
Changes over time in the stroke S of the steam control valve 5 and the rotational speed N of the steam turbine 3 in the steam control valve control apparatus of the present embodiment are as shown in FIG. It can be seen that the stroke S of the steam control valve 5 is closed earlier than in the prior art, and the rotational speed N of the steam turbine 3 is less excessive than in the prior art.
[0026]
As described above, in the steam control valve control apparatus of the present embodiment, the oil drain pot 9 for venting air is installed on the upstream side of the control oil pump 8, and the air mixed in the oil system is supplied to the electric oil converter 12 and It can be removed so as not to enter the hydraulic cylinder 13 side, and the operation delay of the steam valve due to air mixing can be prevented. That is, since the air in the oil system is extracted, the operation delay of the steam control valve 5 is eliminated, and a transient increase in the rotational speed at the start of the feed water pump driving steam turbine 3 is reduced.
[0027]
FIG. 3 shows a main part of the second embodiment of the present invention, in which an oil drain pot 16 is installed in an oil drain system 20 that connects the electro-oil converter 12 and the oil tank 76. Other configurations are the same as those of the prior art (FIG. 6). In this embodiment, the drain pot 16 is installed in the drainage system and is placed at a position higher than the control oil pump 8, the electro-oil converter 12, and the hydraulic cylinder 13, so that air does not collect in the drainage system. can do.
[0028]
FIG. 4 shows a main part of the third embodiment of the present invention, in which air does not accumulate in the hydraulic cylinder 13.
4A, an air vent orifice 17 is provided in the piston portion of the hydraulic cylinder 13, and the air accumulated in the lower portion of the cylinder is discharged through the upper portion of the cylinder. In FIG. 4 (b), the piston of the hydraulic cylinder 13 is a labyrinth structure 18, and the air accumulated below is discharged from between the labyrinth structure and the inner wall of the cylinder.
[0029]
In this embodiment, the amount of oil leaking from the orifice 17 and the labyrinth structure 18 is sufficiently smaller than the amount of oil supplied to the hydraulic cylinder 13 so that there is no operation delay due to these structures.
[0030]
FIG. 5 shows a main part of the fourth embodiment of the present invention.
FIG. 5A is a block diagram of a configuration in which the steam control valve full-close signal becomes an input signal only for a few seconds when the steam turbine 3 is started in the water supply and turbine speed control device 10. When the start signal of the steam turbine 3 is inputted before the rotation of the steam turbine 3, the steam control valve abrupt closing signal is given to forcibly close the steam control valve 5. By doing in this way, since a closing signal is inputted at an early stage compared with the case where the steam control valve 5 is controlled after the rotational speed of the steam turbine 3 is increased, the transient rotational speed of the steam turbine 3 is suppressed to a lower level. And can be controlled to a constant rotational speed in a short time.
[0031]
FIG. 5B shows a case where a lead delay circuit is installed at the input portion of the turbine actual speed signal 11 a from the speed detector 11 of the water supply and turbine speed control device 10 to set a large lead constant. Also with this configuration, speed control can be performed in advance of the actual rotational speed of the steam turbine 3 as in FIG. 5A, so that the constant rotational speed can be controlled in a short time. A similar effect can be obtained with a control circuit combining FIGS. 5 (a) and 5 (b).
[0032]
【The invention's effect】
According to the steam control valve control device of the present invention, the mixing of air into the oil system is prevented, and even if air is mixed, the steam turbine that drives the feed water pump that supplies cooling water to the nuclear reactor in an emergency. The operation can be started stably with less delay.
[Brief description of the drawings]
FIG. 1 is a system diagram showing a steam control valve control apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram for explaining the operation of the steam control valve control apparatus according to the first embodiment.
FIG. 3 is a system diagram showing a main part of a steam control valve control apparatus according to a second embodiment of the present invention.
FIG. 4 is a diagram showing a main part of a steam control valve control apparatus according to a third embodiment of the present invention.
FIGS. 5A and 5B show a steam control valve control apparatus according to a fourth embodiment of the present invention, and FIGS. 5A and 5B are block diagrams showing examples of different water supply and turbine speed control apparatuses, respectively. FIGS.
FIG. 6 is a system diagram showing a conventional steam control valve control device.
FIG. 7 is a block diagram of a water supply and turbine speed control device in a conventional steam control valve control device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Reactor, 2 ... Feed water pump, 3 ... Steam turbine for feed water pump drive, 4 ... Steam stop valve, 5 ... Steam control valve, 6 ... Oil tank, 7 ... Lubricating oil pump, 8 ... Control oil pump, 9 ... Oil supply drain pot, 10 ... Water supply and turbine speed control device, 11 ... Speed detector, 11a ... Turbine actual speed signal, 12 ... Electric oil converter, 13 ... Hydraulic cylinder, 14 ... Air vent orifice, 15 ... Steam control valve fully open Spring, 16 ... drainage drain pot, 17 ... air vent orifice, 18 ... labyrinth structure, 19 ... bearing, 20 ... drainage system, 21 ... bypass system.

Claims

A steam turbine for driving a feed water pump for urgently supplying cooling water to the nuclear reactor, a lubricant pump provided on the outlet side of the oil tank and driven by the steam turbine for driving the feed water pump, and the lubricant A control oil pump provided on the downstream side of the pump and driven by the steam turbine for driving the feed water pump and increasing the pressure of the discharge oil from the lubricating oil pump; and the control oil provided on the downstream side of the control oil pump The flow rate of the discharged oil is controlled based on the feed water and the electric oil converter input signal which is the output from the turbine speed control device using the actual speed signal of the steam turbine for driving the feed water pump and the feed water speed command signal as input signals. An electro-oil converter, an oil discharge line connecting the electro-oil converter and the oil tank, a hydraulic cylinder provided on the downstream side of the electro-oil converter, and the hydraulic pressure In steam control valve controller having connected the installed steam governing valve to the steam inlet side of the feedwater pump driving steam turbine Linder,
An oil supply drain pot for removing air mixed in the oil system is provided upstream of the control oil pump, and a bypass system connected from the oil supply drain pot to the oil tank through an orifice is provided. Steam control valve control device.

A steam turbine for driving a feed water pump for urgently supplying cooling water to the nuclear reactor, a lubricant pump provided on the outlet side of the oil tank and driven by the steam turbine for driving the feed water pump, and the lubricant A control oil pump provided on the downstream side of the pump and driven by the steam turbine for driving the feed water pump and increasing the pressure of the discharge oil from the lubricating oil pump; and the control oil provided on the downstream side of the control oil pump The flow rate of the discharged oil is controlled based on the feed water and the electric oil converter input signal which is the output from the turbine speed control device using the actual speed signal of the steam turbine for driving the feed water pump and the feed water speed command signal as input signals. An electro-oil converter, an oil discharge line connecting the electro-oil converter and the oil tank, a hydraulic cylinder provided on the downstream side of the electro-oil converter, and the hydraulic pressure In steam control valve controller having connected the installed steam governing valve to the steam inlet side of the feedwater pump driving steam turbine Linder,
A steam control valve control apparatus comprising a drain oil drain pot for removing air mixed in the oil system in the drain line.

A steam turbine for driving a feed water pump for urgently supplying cooling water to the nuclear reactor, a lubricant pump provided on the outlet side of the oil tank and driven by the steam turbine for driving the feed water pump, and the lubricant A control oil pump provided on the downstream side of the pump and driven by the steam turbine for driving the feed water pump and increasing the pressure of the discharge oil from the lubricating oil pump; and the control oil provided on the downstream side of the control oil pump The flow rate of the discharged oil is controlled based on the feed water and the electric oil converter input signal which is the output from the turbine speed control device using the actual speed signal of the steam turbine for driving the feed water pump and the feed water speed command signal as input signals. An electro-oil converter, an oil discharge line connecting the electro-oil converter and the oil tank, a hydraulic cylinder provided on the downstream side of the electro-oil converter, and the hydraulic pressure In steam control valve controller having connected the installed steam governing valve to the steam inlet side of the feedwater pump driving steam turbine Linder,
A steam control valve control apparatus, wherein an orifice for removing air mixed in the oil system is provided in a piston of the hydraulic cylinder.
A steam control valve control apparatus characterized in that a piston of the hydraulic cylinder has a labyrinth structure.

A steam turbine for driving a feed water pump for urgently supplying cooling water to the nuclear reactor, a lubricant pump provided on the outlet side of the oil tank and driven by the steam turbine for driving the feed water pump, and the lubricant A control oil pump provided on the downstream side of the pump and driven by the steam turbine for driving the feed water pump and increasing the pressure of the discharge oil from the lubricating oil pump; and the control oil provided on the downstream side of the control oil pump The flow rate of the discharged oil is controlled based on the feed water and the electric oil converter input signal which is the output from the turbine speed control device using the actual speed signal of the steam turbine for driving the feed water pump and the feed water speed command signal as input signals. An electro-oil converter, an oil discharge line connecting the electro-oil converter and the oil tank, a hydraulic cylinder provided on the downstream side of the electro-oil converter, and the hydraulic pressure In steam control valve controller having connected the installed steam governing valve to the steam inlet side of the feedwater pump driving steam turbine Linder,
The water supply and turbine speed control device performs a steam control valve sudden change in place of the actual speed signal and the feed water speed command signal of the feed water pump drive steam turbine for a few seconds immediately after the feed water pump drive steam turbine start signal is received. A steam control valve control apparatus characterized in that a closing signal is used as an input signal.

A steam turbine for driving a feed water pump for urgently supplying cooling water to the nuclear reactor, a lubricant pump provided on the outlet side of the oil tank and driven by the steam turbine for driving the feed water pump, and the lubricant A control oil pump provided on the downstream side of the pump and driven by the steam turbine for driving the feed water pump and increasing the pressure of the discharge oil from the lubricating oil pump; and the control oil provided on the downstream side of the control oil pump The flow rate of the discharged oil is controlled based on the feed water and the electric oil converter input signal which is the output from the turbine speed control device using the actual speed signal of the steam turbine for driving the feed water pump and the feed water speed command signal as input signals. An electro-oil converter, an oil discharge line connecting the electro-oil converter and the oil tank, a hydraulic cylinder provided on the downstream side of the electro-oil converter, and the hydraulic pressure In steam control valve controller having connected the installed steam governing valve to the steam inlet side of the feedwater pump driving steam turbine Linder,
The steam supply / turbine speed control apparatus includes a progress / delay circuit that adds a progress signal to an input turbine actual speed signal and outputs the result as a preceding actual speed signal.