JP3855826B2

JP3855826B2 - Deaerated water supply device

Info

Publication number: JP3855826B2
Application number: JP2002102725A
Authority: JP
Inventors: 信二阿野; 真明種子野
Original assignee: Kurita Water Industries Ltd
Current assignee: Kurita Water Industries Ltd
Priority date: 2002-04-04
Filing date: 2002-04-04
Publication date: 2006-12-13
Anticipated expiration: 2022-04-04
Also published as: JP2003300062A

Description

【０００１】
【発明の属する技術分野】
本発明は、脱気（脱酸素、脱炭酸）処理された水をボイラ等の需要箇所へ送水するための脱気水供給装置に関するものであり、特に窒素ガス置換方式の脱気装置により給水を脱気処理するようにした脱気水供給装置に関する。
【０００２】
【従来の技術】
図６を参照して従来脱気水供給装置について説明する。
【０００３】
給水配管１から給水タンク２に導入された給水は、ポンプ４が介設された送水配管３，５を介して窒素ガス置換式脱気装置（Ｎ_２式脱気装置）６へ送水され、脱気処理される。この窒素ガス置換式脱気装置６は、バブリング方式、充填材接触方式、自給式などのものがあるが、いずれも内部に水槽を有しており、水が一定時間滞留するように構成されている。
【０００４】
この脱気装置６で脱気処理された脱気水は、途中にポンプ１７が介設された送水配管１０を介して送り出される。
【０００５】
第２送水配管１０からの脱気水は送水配管１２、給水ポンプ１３及び配管１４を介してボイラ１５等の需要箇所へ送水される。
【０００６】
【発明が解決しようとする課題】
上記従来例では、このように構成された脱気水供給装置にあっては、需要個所の水需要が急激に増加した場合、脱気装置６内の水槽が空になり、水が需要個所へ送水されないおそれがある。
【０００７】
本発明は、需要箇所の水需要が急激に増加しても、確実に水が需要箇所へ送水される脱気水供給装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
請求項１の脱気水供給装置は、
給水が供給される給水タンクと、
該給水タンクから第１のポンプを有する第１送水配管を介して給水が供給される窒素ガス置換式脱気装置と、
該脱気装置から脱気水を送り出す第２送水配管と、
該第２送水配管と該第１のポンプよりも上流側の第１送水配管とを連結する第３送水配管と、
該第２送水配管と需要箇所とを連結する第４送水配管と、
を有し、該第２送水配管に第２のポンプが設けられ、これにより該第３送水配管を介して第２送水配管の水の一部が第１送水配管に返送可能となっていることを特徴とするものである。
【０００９】
請求項２の脱気水供給装置は、請求項１において、前記第２送水配管又は第４送水配管内から窒素ガスを分離するガス分離手段を有することを特徴とするものである。
【００１０】
請求項３の脱気水供給装置は、
給水が供給される給水タンクと、
該給水タンクから第１送水配管を介して給水が供給される窒素ガス置換式脱気装置と、
該脱気装置から脱気水を送り出す第２送水配管と、
該第２送水配管と該給水タンクとを連結する第３送水配管と、
該第２送水配管と需要箇所とを連結する第４送水配管と、
前記第２送水配管又は第４送水配管内から窒素ガスを分離するガス分離手段と、
を有するものである。
【００１１】
請求項４の脱気水供給装置は、請求項２又は３において、前記ガス分離手段は、該配管から分岐したガス放出配管であることを特徴とするものである。
【００１２】
請求項５の脱気水供給装置は、請求項１又は２において、前記第４送水配管に給水ポンプが設けられており、前記第１ポンプおよび第２ポンプの容量は該給水ポンプの容量の１．１〜１．５倍であることを特徴とするものである。
【００１３】
請求項６の脱気水供給装置は、
給水が供給される給水タンクと、
該給水タンクから重力により第１送水配管を介して給水が供給される窒素ガス置換式脱気装置と、
該脱気装置から脱気水を送り出す第２送水配管と、
該第２送水配管と該第１送水配管とを連結する第３送水配管と、
該第２送水配管と需要箇所とを連結する第４送水配管と、
該第２送水配管又は第４送水配管内から窒素ガスを分離するガス分離手段と、を有することを特徴とするものである。
【００１４】
請求項７の脱気水供給装置は、
給水が供給される給水タンクと、
該給水タンクから重力により第１送水配管を介して給水が供給される窒素ガス置換式脱気装置と、
該脱気装置から脱気水を送り出す第２送水配管と、
該第２送水配管と第１送水配管とを連結する第３送水配管と、
該第２送水配管と需要箇所とを連結する第４送水配管と、
を有し、該第２送水配管にポンプが設けられ、これにより該第３送水配管を介して第２送水配管の水の一部が第１送水配管に返送可能となっていることを特徴とするものである。
【００１５】
請求項８の脱気水供給装置は、請求項７において、前記第２送水配管又は第４送水配管内から窒素ガスを分離するガス分離手段を有することを特徴とするものである。
【００１６】
請求項９の脱気水供給装置は、請求項７又は８において、前記第４送水配管に給水ポンプが設けられており、前記ポンプの容量は該給水ポンプの容量の１．１〜１．５倍であることを特徴とするものである。
【００１７】
本発明の脱気水供給装置が、給水が供給される給水タンクと、該給水タンクからポンプを有する第１送水配管を介して給水が供給される窒素ガス置換式脱気装置と、該脱気装置から脱気水を送り出す第２送水配管と、該第２送水配管と該ポンプよりも上流側の第１送水配管とを連結する第３送水配管と、該第２送水配管と需要箇所とを連結する第４送水配管と、を有するものである場合にあっては、需要箇所の水需要が通常量の場合、脱気装置で十分に脱気された水のみが需要箇所へ送水される。需要箇所の水需要が脱気装置の処理能力を超えた場合には、第３送水配管を介して給水タンク内の給水が窒素ガス置換式脱気装置を経ることなく脱気処理水に添加されて需要箇所へ送水される。なお、このように未脱気水が添加されたとしても、需要箇所の要求脱気レベルには合致した脱気水を需要箇所へ送水することができる。
【００１８】
この脱気水供給装置にあっては、第２送水配管又は第４送水配管内から窒素ガスを分離するガス分離手段を設けてもよい（請求項２）。このガス分離手段を設けることにより、該ガス分離手段よりも下流側に設けられた送水ポンプのエアー噛み（エアーロック）が防止される。
【００１９】
本発明の脱気水供給装置が、給水が供給される給水タンクと、該給水タンクから第１送水配管を介して給水が供給される窒素ガス置換式脱気装置と、該脱気装置から脱気水を送り出す第２送水配管と、該第２送水配管と該給水タンクとを連結する第３送水配管と、該第２送水配管と需要箇所とを連結する第４送水配管と、前記第２送水配管又は第４送水配管内から窒素ガスを分離するガス分離手段と、を有するものである場合にあっては、需要箇所の水需要量が通常量の場合、給水タンク内の水が窒素ガス置換式脱気装置に送られて脱気処理される。この窒素ガス置換式脱気装置からの脱気水の所要部分が需要箇所に供給され、残部が給水タンクに返送される。このように脱気処理した脱気水を給水タンクに返送することにより、給水タンク内の給水は次第に脱気されたものとなる。
【００２０】
この状態から、需要箇所の水需要量が窒素ガス置換式脱気装置の処理能力を超えるようになったときには、給水タンクの水が第３送水配管を介して窒素ガス置換式脱気装置を経ることなく脱気処理水に添加されて需要箇所へ送水されることになる。この給水タンク中の水は相当程度脱気処理されたものであるため、この給水タンク内の水が窒素ガス置換式脱気装置からの水に添加されても、添加後の水の脱気レベルは十分に需要箇所の要求脱気レベルを満たすものとなる。
【００２１】
なお、この窒素ガス置換式脱気装置から送り出される脱気水からガス分離手段により窒素ガスを分離することにより、該ガス分離手段よりも下流側に配置された給水ポンプのエアーロック現象が防止され、脱気水が需要箇所へ常に安定して供給される。
【００２２】
【発明の実施の形態】
以下、図面を参照して実施の形態について説明する。
【００２３】
図１は、実施の形態に係る脱気水供給装置を示す系統図である。
【００２４】
給水配管１から給水タンク２に導入された給水は、ポンプ４が介設された第１送水配管３，５を介して窒素ガス置換式脱気装置（Ｎ_２式脱気装置）６へ送水され、脱気処理される。この窒素ガス置換式脱気装置６は、バブリング方式、充填材接触方式、自給式などのいずれの方式のものであってもよいが、通常内部に水槽を有しており、一定時間滞留するように構成されている。
【００２５】
この脱気装置６で脱気処理された脱気水は、途中にポンプ１７及びガス分離手段８が介設された第２送水配管７，１０を介して送り出される。このガス分離手段８としては、棚段塔式の流下式気液分離装置や、十分な容量を有し、上部に排気手段を具備するタンクなどのいずれのものであってもよい。符号９は、ガス分離手段８で分離された窒素ガスを大気放出させるための配管を示す。
【００２６】
第２送水配管１０からの脱気水の大部分は、第３送水配管１１を介してポンプ４よりも上流側の第１送水配管３に返送され、残部の脱気水は第４送水配管１２、給水ポンプ１３及び配管１４を介してボイラ１５等の需要箇所へ送水される。
【００２７】
なお、ポンプ４，１７の容量は給水ポンプ１３の容量の１．１〜１．５倍程度であることが好ましい。
【００２８】
このように構成された脱気水供給装置にあっては、需要個所の水需要が通常量の場合、脱気装置６で十分に脱気された水のみが送水配管７，１０，１４を介してボイラ１５へ送水される。ボイラ１５の水需要が脱気装置６の処理能力を超えた場合には、第３送水配管１１を介して給水タンク２内の給水が脱気装置６を経ることなく配管１０からの脱気処理水に添加されて配管１２，１４を介してボイラ１５へ送水されることになる。これにより、窒素ガス置換式脱気装置６内の水槽が空になることはなく、窒素ガス置換式脱気装置６から脱気水が送水され続ける。
【００２９】
なお、第４送水配管１２の送水に未脱気水が添加されたとしても、この給水タンク２から第３送水配管１１を介して添加される未脱気処理水の水量が所定割合以下である限り、ボイラ１５の要求脱気レベルに合致した脱気水を需要箇所へ送水することができる。また、仮にボイラ１５の要求脱気レベルを超えた脱気不十分な水がボイラ１５に供給されたとしても、短時間であるならば問題にはならない。
【００３０】
図２は別の実施の形態に係る脱気水供給装置の系統図である。
【００３１】
この実施の形態では、第２送水配管１０から分岐した第３送水配管１１は、第１送水配管３ではなく給水タンク２に接続されている。その他の構成は図１と同一であり、同一符号は同一部分を示している。
【００３２】
この実施の形態においても、給水タンク２内の水は第１送水配管３，５を介して窒素ガス置換式脱気装置６へ送水され、脱気処理され、脱気水がポンプ１７、第２送水配管７、ガス分離手段８、第２送水配管１０を介して送り出される。需要箇所（この場合はボイラ１５）の水需要量が通常量の場合、送水配管１０からの水の多くは第３送水配管１１を介して給水タンク２へ送水され、残部がボイラ１５へ送水される。
【００３３】
このように脱気処理した脱気水を給水タンク２に返送することにより、給水タンク２内の給水は次第に脱気されたものとなる。
【００３４】
この状態から、水需要量が窒素ガス置換式脱気装置６の処理能力を超えるようになったときには、給水タンク２の水が窒素ガス置換式脱気装置６を経ることなく第３送水配管１１を介して送水され、第２送水配管１０からの脱気処理水に添加されてボイラ１５へ送水されることになる。このため、窒素ガス置換式脱気装置６の水槽が空になることが防止される。
【００３５】
なお、この実施の形態では、この給水タンク２中の水は相当程度脱気処理されたものであるため、この給水タンク２内の水が第２送水配管１０からの脱気処理水に添加されても、添加後の水の脱気レベルは十分にボイラ１５の要求脱気レベルを満たすものとなる。
【００３６】
上記図１、図２の実施の形態にあっては、ガス分離手段８によって脱気水からガスを分離しているので、給水ポンプ１３でエアーロック現象が防止され、該給水ポンプ１３から水が安定してボイラ等の需要箇所へ送水される。
【００３７】
なお、図１，２ではガス分離手段８が第２送水配管に設けられているが、これに代えて図３のようにしてもよい。
【００３８】
図３の実施の形態にあっては、窒素ガス置換式脱気装置６からポンプ１７を介して第２送水配管１８へ脱気水を送り出す。この第２送水配管１８に高位部１８ａを設け、この高位部１８ａの最高位箇所にガス分散手段としてのガス放出配管１９を接続し、第２送水配管１８中で水から分離したガスを大気へ放出する。この第２送水配管１８は、前記第３送水配管１１及び第４送水配管１２に分岐している。図３のその他の構成は図２と同一である。なお、第３送水配管１１は、図１の通り、第１送水配管３に接続されてもよい。この図３の脱気水供給装置によっても、図１，２と同様の作用効果が奏される。加えて脱気水中の窒素ガスが図１，２の方式より分離しやすいので好ましい。
【００３９】
図４はさらに別の実施の形態を示すものであり、図３の第２送水配管１８に設置する大気へのガス放出配管１９の代りに、分離した窒素ガスと共に脱気水の一部を給水タンク２へ戻す窒素ガス返送配管２０を分岐して設けている。この実施の形態によれば、分離した窒素ガスと一部の脱気水が給水タンク２内へ返送されるので、給水タンク内の雰囲気をより窒素ガス雰囲気とすることができ、該タンク２内の給水中への酸素の溶け込みがより確実に防止されるようになる。
【００４０】
図５はさらに別の実施の形態を示すものであり、図３の配管１９の代りに、分離した窒素ガスと共に脱気水を窒素ガス返送配管２１を介して第１送水配管３に送るものである。この場合、返送配管２１で返送される脱気水量は第１送水配管３で送られる給水に比べてごく僅かであるためポンプ４に悪影響を与えることはない。
【００４１】
なお、図示はしないが、図１〜５において、脱気装置６からの脱気水がガス分離される前に、該脱気水の一部が給水タンク２又は第１送水配管３に返送されるように、窒素ガス返送配管を図１〜５における分岐箇所よりも上流側から分岐させてもよい。
【００４２】
上記実施の形態はいずれも本発明の一例であり、本発明は図示以外の形態をもとりうる。例えば、給水タンク２内の水面に、水と空気との接触を断つための遮蔽材を浮かべるとさらに脱気効率が上がって好ましい。
【００４３】
上記実施の形態では、ポンプ４によって給水を窒素ガス置換式脱気装置（Ｎ_２式脱気装置）６に送水しているが、給水タンク２を高所に配置し、重力（水頭差）によって給水を脱気装置６へ送水してもよい。
【００４４】
また、脱気装置６を高所に配置し、脱気装置６から水頭差によって脱気水を送水するようにしてもよい。本発明では、ポンプ４やポンプ１７はポンプ１３と連動して駆動されてもよく、連続して駆動されてもよい。前述の緊急避難的給水のために、給水タンク内の給水をできるだけ脱気状態に保つにはポンプ４やポンプ１７を連続して駆動するのが望ましい。
【００４５】
本発明は、ボイラ以外の種々の脱気水需要箇所に脱気水を供給することができる。
【００４６】
【発明の効果】
以上の通り、本発明によると、脱気水需要箇所の水需要が一時的に窒素ガス置換式脱気装置の処理能力を超えても、所要程度に脱気された水を需要箇所に安定して供給することができる。又、脱気水中の窒素ガスは需要箇所に送水する給水ポンプの前までに分離することにより、給水ポンプのエア噛みが防止でき、安定運転することができる。
【図面の簡単な説明】
【図１】第１の実施の形態に係る脱気水供給装置を示す系統図である。
【図２】第２の実施の形態に係る脱気水供給装置を示す系統図である。
【図３】第３の実施の形態に係る脱気水供給装置を示す系統図である。
【図４】第４の実施の形態に係る脱気水供給装置を示す系統図である。
【図５】第５の実施の形態に係る脱気水供給装置を示す系統図である。
【図６】従来例に係る脱気水供給装置を示す系統図である。
【符号の説明】
２給水タンク
６Ｎ_２式脱気装置
８ガス分離手段
１５ボイラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a degassing water supply device for supplying degassed (deoxygenated, decarboxylated) water to a demand point such as a boiler, and in particular, water is supplied by a nitrogen gas replacement type degassing device. The present invention relates to a deaerated water supply device that performs a deaeration process.
[0002]
[Prior art]
A conventional deaerated water supply apparatus will be described with reference to FIG.
[0003]
The water supplied from the water supply pipe 1 to the water supply tank 2 is supplied to the nitrogen gas substitution type deaeration device (N ₂ type deaeration device) 6 through the water supply pipes 3 and 5 in which the pump 4 is interposed. Qi is treated. The nitrogen gas substitution type deaeration device 6 includes a bubbling method, a filler contact method, a self-sufficiency method, etc., all of which have a water tank inside and are configured to retain water for a certain period of time. Yes.
[0004]
The deaerated water deaerated by the deaerator 6 is sent out through a water supply pipe 10 in which a pump 17 is interposed.
[0005]
The deaerated water from the second water supply pipe 10 is supplied to a demand point such as the boiler 15 through the water supply pipe 12, the water supply pump 13 and the pipe 14.
[0006]
[Problems to be solved by the invention]
In the above-described conventional example, in the deaerated water supply device configured as described above, when the water demand at the demand site increases rapidly, the water tank in the deaeration device 6 is emptied, and the water goes to the demand site. There is a risk that water will not be delivered.
[0007]
An object of this invention is to provide the deaeration water supply apparatus by which water is reliably sent to a demand location even if the water demand of a demand location increases rapidly.
[0008]
[Means for Solving the Problems]
The deaerated water supply device according to claim 1 comprises:
A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device to which water is supplied from the water supply tank via a first water supply pipe having a first pump;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the first water supply pipe upstream of the first pump;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
And a second pump is provided in the second water supply pipe, whereby a part of the water in the second water supply pipe can be returned to the first water supply pipe via the third water supply pipe. It is characterized by.
[0009]
A deaerated water supply device according to a second aspect of the present invention is characterized in that, in the first aspect, the deaerated water supply device has a gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe.
[0010]
The deaerated water supply device according to claim 3 is:
A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device to which water is supplied from the water supply tank via the first water supply pipe;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the water supply tank;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
Gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe;
It is what has.
[0011]
According to a fourth aspect of the present invention, there is provided the deaerated water supply device according to the second or third aspect, wherein the gas separation means is a gas discharge pipe branched from the pipe.
[0012]
The deaerated water supply device according to claim 5 is the degassing water supply device according to claim 1 or 2, wherein a water supply pump is provided in the fourth water supply pipe, and the capacity of the first pump and the second pump is one of the capacity of the water supply pump. 0.1 to 1.5 times.
[0013]
The deaerated water supply device of claim 6 comprises:
A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device in which water is supplied from the water supply tank by gravity through the first water supply pipe;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the first water supply pipe;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
Gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe.
[0014]
The deaerated water supply device of claim 7 comprises:
A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device in which water is supplied from the water supply tank by gravity through the first water supply pipe;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the first water supply pipe;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
And a pump is provided in the second water supply pipe, whereby a part of the water in the second water supply pipe can be returned to the first water supply pipe via the third water supply pipe. To do.
[0015]
The deaerated water supply device according to an eighth aspect of the present invention is characterized in that in the seventh aspect, the deaerated water supply device has a gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe.
[0016]
The deaerated water supply device of claim 9 is the dewatering water supply device according to claim 7 or 8, wherein a water supply pump is provided in the fourth water supply pipe, and the capacity of the pump is 1.1 to 1.5 of the capacity of the water supply pump. It is characterized by being doubled.
[0017]
Deaerated water supply device of the present invention, a water supply tank water is supplied, and a nitrogen gas replacement type deaerator feed water is supplied via the first water supply pipe having a pump from the water supply tank, dehydration gas A second water supply pipe for sending deaerated water from the apparatus, a third water supply pipe for connecting the second water supply pipe and the first water supply pipe upstream of the pump, the second water supply pipe and the demand point. In the case of having the fourth water supply pipe to be connected, when the water demand at the demand point is a normal amount, only the water sufficiently deaerated by the deaeration device is supplied to the demand point. When the water demand at the demand point exceeds the processing capacity of the deaerator, the water in the water tank is added to the degassed water through the third water supply pipe without passing through the nitrogen gas replacement deaerator. The water is sent to the demand point. In addition, even if undeaerated water is added in this way, deaerated water that matches the required deaeration level of the demand point can be sent to the demand point.
[0018]
In the degassed water supply device of this may be provided a gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply in the pipe (claim 2). By providing this gas separation means, air biting (air lock) of a water pump provided downstream of the gas separation means is prevented.
[0019]
Deaerated water supply device of the present invention, a water supply tank water is supplied, and a nitrogen gas replacement type deaerator feed water through the first water supply pipe from the water supply tank is supplied, de from dehydration degasifier A second water supply pipe for sending out the air, a third water supply pipe connecting the second water supply pipe and the water supply tank, a fourth water supply pipe connecting the second water supply pipe and the demand point, and the second Gas separation means for separating nitrogen gas from the water supply pipe or the fourth water supply pipe, when the water demand at the demand point is a normal amount, the water in the water supply tank is nitrogen gas. It is sent to a displacement type deaerator to be deaerated. The required part of the deaerated water from this nitrogen gas substitution type deaerator is supplied to the demand point, and the remaining part is returned to the water supply tank. By returning the deaerated water thus deaerated to the water supply tank, the water supply in the water supply tank is gradually degassed.
[0020]
From this state, when the water demand at the demand point exceeds the processing capacity of the nitrogen gas replacement deaerator, the water in the water supply tank passes through the nitrogen gas replacement deaerator through the third water supply pipe. Without being added to the degassed treated water, the water is sent to the demand point. Since the water in this water supply tank has been degassed to a considerable extent, even if the water in this water supply tank is added to the water from the nitrogen gas replacement degassing device, the deaeration level of the water after the addition Will sufficiently meet the required degassing level of the demand point.
[0021]
In addition, by separating the nitrogen gas from the deaerated water sent out from the nitrogen gas substitution type deaeration device by the gas separation means, the air lock phenomenon of the water supply pump disposed downstream of the gas separation means is prevented. The deaerated water is always supplied stably to the demand point.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings.
[0023]
Figure 1 is a system diagram showing a deaerated water supply unit according to the implementation.
[0024]
Water introduced from the water supply pipe 1 to the water tank 2, a pump 4 is the water through the first water supply pipe 3, 5 are interposed nitrogen gas type deaerator (N ₂ Formula degasser) to 6 Degassed. The nitrogen gas substitution type deaeration device 6 may be of any method such as a bubbling method, a filler contact method, or a self-sufficing method, but usually has a water tank inside so as to stay for a certain period of time. It is configured.
[0025]
The deaerated water deaerated by the deaerator 6 is sent out through the second water supply pipes 7 and 10 in which the pump 17 and the gas separating means 8 are provided on the way. The gas separation means 8 may be any one of a down-flow type gas-liquid separation device of a tower column type or a tank having a sufficient capacity and having an exhaust means at the top. Reference numeral 9 denotes a pipe for releasing the nitrogen gas separated by the gas separation means 8 into the atmosphere.
[0026]
Most of the deaerated water from the second water supply pipe 10 is returned to the first water supply pipe 3 upstream of the pump 4 through the third water supply pipe 11, and the remaining deaerated water is the fourth water supply pipe 12. Then, water is supplied to a demand point such as the boiler 15 through the water supply pump 13 and the pipe 14.
[0027]
In addition, it is preferable that the capacity | capacitance of the pumps 4 and 17 is about 1.1 to 1.5 times the capacity | capacitance of the feed water pump 13. FIG.
[0028]
In the deaerated water supply device configured as described above, when the water demand at the demand point is a normal amount, only water sufficiently deaerated by the deaeration device 6 passes through the water supply pipes 7, 10, 14. The water is fed to the boiler 15. When the water demand of the boiler 15 exceeds the processing capacity of the deaeration device 6, the water supply in the water supply tank 2 is degassed from the pipe 10 via the third water supply pipe 11 without passing through the deaeration device 6. The water is added to the water and sent to the boiler 15 through the pipes 12 and 14. Thereby, the water tank in the nitrogen gas replacement degassing device 6 is not emptied, and degassed water is continuously fed from the nitrogen gas replacement degassing device 6.
[0029]
In addition, even if undeaerated water is added to the water supply of the fourth water supply pipe 12, the amount of non-deaerated treated water added from the water supply tank 2 via the third water supply pipe 11 is equal to or less than a predetermined ratio. As long as it is possible, deaerated water that matches the required deaeration level of the boiler 15 can be sent to the demand point. Even if insufficiently deaerated water exceeding the required deaeration level of the boiler 15 is supplied to the boiler 15, there is no problem as long as it is a short time.
[0030]
FIG. 2 is a system diagram of a deaerated water supply apparatus according to another embodiment.
[0031]
In this embodiment, the third water supply pipe 11 branched from the second water supply pipe 10 is connected not to the first water supply pipe 3 but to the water supply tank 2. Other configurations are the same as those in FIG. 1, and the same reference numerals indicate the same parts.
[0032]
Also in this embodiment, the water in the water supply tank 2 is supplied to the nitrogen gas substitution type deaeration device 6 through the first water supply pipes 3 and 5 and deaerated, and the deaerated water is supplied to the pump 17 and the second gas. It is sent out through the water supply pipe 7, the gas separation means 8, and the second water supply pipe 10. When the amount of water demand at the demand point (in this case, the boiler 15) is a normal amount, most of the water from the water supply pipe 10 is supplied to the water supply tank 2 through the third water supply pipe 11, and the remainder is supplied to the boiler 15. The
[0033]
By returning the deaerated water thus deaerated to the water supply tank 2, the water supply in the water supply tank 2 is gradually degassed.
[0034]
From this state, when the water demand exceeds the processing capacity of the nitrogen gas replacement deaeration device 6, the water in the water supply tank 2 does not pass through the nitrogen gas replacement deaeration device 6 and the third water supply pipe 11. Is added to the degassed treated water from the second water supply pipe 10 and supplied to the boiler 15. For this reason, it is prevented that the water tank of nitrogen gas substitution type deaeration device 6 becomes empty.
[0035]
In this embodiment, since the water in the water supply tank 2 has been degassed to a considerable extent, the water in the water supply tank 2 is added to the degassed water from the second water supply pipe 10. Even so, the deaeration level of the water after the addition sufficiently satisfies the required deaeration level of the boiler 15.
[0036]
In the embodiment shown in FIGS. 1 and 2, since the gas is separated from the deaerated water by the gas separating means 8, the air lock phenomenon is prevented by the water supply pump 13, and water is supplied from the water supply pump 13. Water is stably sent to demand areas such as boilers.
[0037]
1 and 2, the gas separation means 8 is provided in the second water supply pipe, but instead of this, it may be as shown in FIG. 3.
[0038]
In the embodiment of FIG. 3, degassed water is sent out from the nitrogen gas replacement deaerator 6 to the second water supply pipe 18 via the pump 17. The second water supply pipe 18 is provided with a high portion 18a, and a gas discharge pipe 19 as a gas dispersing means is connected to the highest position of the high portion 18a, so that the gas separated from water in the second water supply pipe 18 is released to the atmosphere. discharge. The second water supply pipe 18 branches into the third water supply pipe 11 and the fourth water supply pipe 12. The other configuration of FIG. 3 is the same as that of FIG. In addition, the 3rd water supply piping 11 may be connected to the 1st water supply piping 3 as FIG. Also with the deaerated water supply device of FIG. 3, the same effects as those of FIGS. In addition, nitrogen gas in the deaerated water is preferable because it is easier to separate than the methods of FIGS.
[0039]
FIG. 4 shows still another embodiment. Instead of the gas discharge pipe 19 to the atmosphere installed in the second water supply pipe 18 of FIG. 3, a part of the deaerated water is supplied together with the separated nitrogen gas. A nitrogen gas return pipe 20 that returns to the tank 2 is branched. According to this embodiment, the separated nitrogen gas and a part of the degassed water are returned into the water supply tank 2, so that the atmosphere in the water supply tank can be made more nitrogen atmosphere, It is possible to more reliably prevent oxygen from being dissolved in the water supply.
[0040]
Figure 5 Hasa et al and shows a another embodiment, instead of the pipe 19 in FIG. 3, and sends the degassed water with separated nitrogen gas to the first water supply pipe 3 via the nitrogen gas return pipe 21 Is. In this case, since the amount of deaerated water returned by the return pipe 21 is very small compared to the water supplied by the first water supply pipe 3, the pump 4 is not adversely affected.
[0041]
Although not shown, in FIGS. 1 to 5, before the deaerated water from the deaerator 6 is gas-separated, a part of the deaerated water is returned to the water supply tank 2 or the first water supply pipe 3. As described above, the nitrogen gas return pipe may be branched from the upstream side of the branch point in FIGS.
[0042]
Each of the above embodiments is an example of the present invention, and the present invention can take forms other than those shown in the drawings. For example, it is preferable that a shielding material for cutting off the contact between water and air is floated on the water surface in the water supply tank 2 because the deaeration efficiency is further increased.
[0043]
In the above embodiment, the feed water is fed to the nitrogen gas substitution type deaeration device (N ₂ type deaeration device) 6 by the pump 4, but the feed water tank 2 is arranged at a high place, and due to gravity (water head difference). The water supply may be sent to the deaeration device 6.
[0044]
Further, the deaeration device 6 may be arranged at a high place, and the deaeration water may be sent from the deaeration device 6 by a water head difference. In the present invention, the pump 4 and the pump 17 may be driven in conjunction with the pump 13 or may be driven continuously. For the emergency evacuation water supply described above, it is desirable to continuously drive the pump 4 and the pump 17 in order to keep the water supply in the water supply tank as deaerated as possible.
[0045]
The present invention can supply deaerated water to various deaerated water demand points other than the boiler.
[0046]
【The invention's effect】
As described above, according to the present invention, even if the water demand at the deaerated water demand point temporarily exceeds the treatment capacity of the nitrogen gas replacement deaerator, the deaerated water is stabilized to the demand point to the required degree. Can be supplied. Further, the nitrogen gas in the deaerated water is separated before the water supply pump that supplies water to the demand point, so that the air biting of the water supply pump can be prevented and stable operation can be achieved.
[Brief description of the drawings]
FIG. 1 is a system diagram showing a deaerated water supply device according to a first embodiment.
FIG. 2 is a system diagram showing a deaerated water supply device according to a second embodiment.
FIG. 3 is a system diagram showing a deaerated water supply apparatus according to a third embodiment.
FIG. 4 is a system diagram showing a deaerated water supply apparatus according to a fourth embodiment.
FIG. 5 is a system diagram showing a deaerated water supply device according to a fifth embodiment.
FIG. 6 is a system diagram showing a deaerated water supply device according to a conventional example.
[Explanation of symbols]
2 Water supply tank 6 N ₂ type deaeration device 8 Gas separation means 15 Boiler

Claims

A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device to which water is supplied from the water supply tank via a first water supply pipe having a first pump;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the first water supply pipe upstream of the first pump;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
It has a second pump is provided in the second water supply pipe, thereby a part of the water in the second water supply pipe via the third water supply pipe has become possible back to the first water supply pipe A deaerated water supply device characterized by the above .

The deaerated water supply device according to claim 1, further comprising a gas separation unit that separates nitrogen gas from the second water supply pipe or the fourth water supply pipe.

A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device to which water is supplied from the water supply tank via the first water supply pipe;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the water supply tank;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
Gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe;
A deaerated water supply device.

4. The deaerated water supply device according to claim 2, wherein the gas separation means is a gas discharge pipe branched from the pipe.

In Claim 1 or 2, a feed water pump is provided in the 4th water supply piping, and the capacity of the 1st pump and the 2nd pump is 1.1 to 1.5 times the capacity of the feed water pump. A deaerated water supply device.

A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device in which water is supplied from the water supply tank by gravity through the first water supply pipe;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the first water supply pipe;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
A degassing water supply device comprising: a gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe.

A water supply tank to which water is supplied;
A nitrogen gas substitution type deaeration device in which water is supplied from the water supply tank by gravity through the first water supply pipe;
A second water supply pipe for sending out the deaerated water from the deaerator;
A third water supply pipe connecting the second water supply pipe and the first water supply pipe;
A fourth water supply pipe connecting the second water supply pipe and the demand point;
And a pump is provided in the second water supply pipe, whereby a part of the water in the second water supply pipe can be returned to the first water supply pipe via the third water supply pipe. Deaerated water supply device.

8. The deaerated water supply device according to claim 7, further comprising gas separation means for separating nitrogen gas from the second water supply pipe or the fourth water supply pipe.

The deaerated water according to claim 7 or 8, wherein a water supply pump is provided in the fourth water supply pipe, and the capacity of the pump is 1.1 to 1.5 times the capacity of the water supply pump. Feeding device.