JPH08144708A - Water supplying device in steam turbine plant - Google Patents
Water supplying device in steam turbine plantInfo
- Publication number
- JPH08144708A JPH08144708A JP28193394A JP28193394A JPH08144708A JP H08144708 A JPH08144708 A JP H08144708A JP 28193394 A JP28193394 A JP 28193394A JP 28193394 A JP28193394 A JP 28193394A JP H08144708 A JPH08144708 A JP H08144708A
- Authority
- JP
- Japan
- Prior art keywords
- water supply
- water
- deaerator
- pump
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蒸気タービンプラント
における給水装置に係り、特にプラントの起動、停止、
負荷しゃ断時及び負荷降下時に発生するウォーターハン
マーを防止し、プラントの安定した運転を可能とした給
水装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply system for a steam turbine plant, and more particularly to starting and stopping the plant.
The present invention relates to a water supply device that prevents a water hammer that occurs when a load is cut off or drops and that enables stable operation of a plant.
【０００２】[0002]
【従来の技術】図４は、従来の蒸気タービンプラントに
おける給水装置の概略系統を示す図であって、図示しな
い復水器から復水ポンプにより復水管１を介して脱気器
２に導入された復水は、そこで蒸気タービンの抽気或は
補助蒸気により加温、脱気される。上記脱気器２の貯水
タンク３内に貯えられた脱気後の給水は脱気器降水管４
を通り、タービン駆動給水ブースタポンプ或は電動機駆
動給水ブースタポンプ６によって昇圧され、さらにそれ
ぞれタービン駆動給水ポンプ７或は電動機駆動給水ポン
プ８により昇圧されて給水管９を経て給水加熱器１０に
送給される。そして、上記給水加熱器１０で加温された
給水は図示しない蒸気発生装置に供給される。なお、符
号１１は蒸気タービンである。2. Description of the Related Art FIG. 4 is a diagram showing a schematic system of a water supply device in a conventional steam turbine plant, which is introduced from a condenser (not shown) into a deaerator 2 through a condenser pipe 1 by a condenser pump. The condensate is heated and deaerated by steam turbine extraction or auxiliary steam. The dewatered water stored in the water storage tank 3 of the deaerator 2 is the deaerator downcomer pipe 4.
Through the turbine driven feed water booster pump or the electric motor driven feed water booster pump 6, and further boosted by the turbine driven feed water pump 7 or the electric motor driven feed water pump 8 and fed to the feed water heater 10 via the feed pipe 9. To be done. The feed water heated by the feed water heater 10 is supplied to a steam generator (not shown). Reference numeral 11 is a steam turbine.
【０００３】上記タービン駆動給水ポンプ７及び電動機
駆動給水ポンプ８の吐出側には、それぞれミニマムフロ
ー管１２，１３が分岐導出されており、その先端がそれ
ぞれ給水ポンプ再循環弁１４，１５を介して脱気器貯水
タンク３に接続され、タービン駆動給水ポンプ７及び電
動機駆動給水ポンプ８の最低通過流量を確保するように
してある。Minimum flow pipes 12 and 13 are branched and led out to the discharge sides of the turbine driven water feed pump 7 and the electric motor driven water feed pump 8, respectively, and the tips thereof are respectively fed through water feed pump recirculation valves 14 and 15. It is connected to the deaerator water storage tank 3 so as to ensure the minimum flow rate of the turbine driven water supply pump 7 and the electric motor driven water supply pump 8.
【０００４】ちなみに、この給水装置のプラントあたり
の設置台数は、プラントにより様々であるが、蒸気ター
ビン駆動給水ポンプ２台（常用）、電動機駆動の給水ポ
ンプ１台（予備用）の合計３台の給水ポンプを設けるの
が一般的である。By the way, although the number of installed water supply devices per plant varies depending on the plant, a total of three water supply pumps driven by a steam turbine (normal use) and one water supply pump driven by an electric motor (reserve) are provided. It is common to install a water supply pump.
【０００５】[0005]
【発明が解決しようとする課題】ところで、この給水装
置において、プラント負荷降下或は負荷遮断（プラント
通常停止を含む）に伴ない給水装置が停止した場合、停
止した給水装置の系内には停止時の脱気器器内圧力に相
当する飽和温度の飽和水（脱気器貯水タンク内の水は飽
和水であるが給水装置系内にはレベル差に相当する水頭
圧が作用しているために加圧水となる）が充満し、平衡
が保たれるが、その後脱気器器内圧の低下が脱気器器内
温度低下より早いため、給水装置系内の飽和圧力と飽和
温度のバランスがくずれ、やがて飽和圧力を下回り飽和
水がフラッシュし、系内が飽和水−飽和蒸気の二相状態
となることが知られている。これを詳しく説明すると、
負荷遮断が発生し、蒸気タービンに入る主蒸気が遮断さ
れると、運転中の給水装置も停止される。このとき、脱
気器は流入する復水、抽気、並びに流出する給水量が零
となり、脱気器器内圧力は維持されるが、その後蒸気発
生装置の起動系のドレインの流入に伴う脱気器ブローや
ボイラーの残燃料のパージ運転に伴う給水再開があるた
め、冷たい復水が脱気器１に流入してくる。しかし、復
水を加熱する蒸気が確保できないために脱気器貯水温度
が低下し、同時に脱気器器内圧力が低下してしまう。By the way, in this water supply system, when the water supply system stops due to plant load drop or load cutoff (including normal plant stop), the system of the stopped water supply system stops. Saturated water at a saturation temperature equivalent to the internal pressure of the deaerator (the water in the deaerator storage tank is saturated water, but the head pressure equivalent to the level difference acts in the water supply system. The pressure inside the deaerator falls faster than the temperature inside the deaerator, so the balance between the saturation pressure and the saturation temperature in the water supply system collapses. It is known that the saturated pressure will eventually drop below the saturated pressure and the saturated water will flash, and the system will be in a two-phase state of saturated water-saturated steam. To explain this in detail,
When the load is cut off and the main steam entering the steam turbine is cut off, the water supply system in operation is also stopped. At this time, the deaerator has zero inflow of condensate, bleed air, and outflow of feed water, and the deaerator pressure is maintained, but then deaerator accompanying the inflow of the drain of the starting system of the steam generator. Cold condensate flows into the deaerator 1 because the water supply is restarted due to the blower operation and the purge operation of the residual fuel of the boiler. However, since the steam for heating the condensate cannot be secured, the deaerator water storage temperature decreases, and at the same time, the deaerator internal pressure decreases.
【０００６】また、脱気器は多量の温水を保有してお
り、給水ポンプへの接続配管は脱気器底部より抽出され
ているため、脱気器と給水ポンプ間の配管にはプラント
停止時と同じく高温の給水が入っており、飽和圧力も高
い。この時脱気器内圧力のみが低下すると、この配管中
の飽和圧力と温度のバランスがくずれ、給水装置系内の
飽和水がフラッシュし、飽和水−飽和蒸気の二相状態と
なる。Since the deaerator holds a large amount of hot water and the connection pipe to the water supply pump is extracted from the bottom of the deaerator, the pipe between the deaerator and the water supply pump is used when the plant is stopped. Like the above, it contains hot water and has a high saturation pressure. At this time, if only the pressure in the deaerator is lowered, the balance between the saturation pressure and the temperature in the pipe is lost, the saturated water in the water supply system is flushed, and the saturated water-saturated steam becomes a two-phase state.
【０００７】また、以上述べた負荷降下、負荷遮断以外
にも給水装置が停止することがある。これは発電所所内
単独負荷運転に移行させる場合である。この場合も蒸気
タービンの負荷の急減により脱気器に流入する復水を加
熱する抽気の圧力が急激に低下し、脱気器器内圧力が低
下することになる。一般に、発電所所内単独負荷運転発
生と同時に給水量も急減することから、給水装置も１台
は残し、他は停止する。これにより前述のように、停止
した給水装置系内で飽和水がフラッシュし、飽和水、飽
和蒸気の二相状態となる。In addition to the load drop and load shedding described above, the water supply device may stop. This is the case when shifting to single load operation inside the power plant. Also in this case, the pressure of the bleed air that heats the condensate flowing into the deaerator sharply decreases due to the sudden decrease in the load of the steam turbine, and the pressure inside the deaerator decreases. In general, the water supply amount is rapidly reduced at the same time when the single load operation occurs in the power plant, so that one water supply device is left and the others are stopped. As a result, as described above, the saturated water is flushed in the stopped water supply system, and a two-phase state of saturated water and saturated steam is obtained.
【０００８】しかして、負荷降下、負荷遮断或は発電所
所内単独負荷運転により飽和水がフラッシュし、飽和水
−飽和蒸気の二相状態となった後に、時間を経ないで給
水装置を再起動すると、タービン駆動給水ブースタポン
プ５、電動機駆動給水ブースタポンプ６、タービン駆動
給水ポンプ７、電動機駆動給水ポンプ８、及び給水ブー
スタポンプと給水ポンプ間の給水連絡管１６，１７及び
給水管９内に滞留している飽和蒸気が加圧され、急激な
凝縮が起り、その結果ウォーターハンマーが発生し、機
器に損傷が生じる可能性がある。However, after the saturated water is flushed due to load drop, load shedding, or single load operation in the power station, and the saturated water-saturated steam two-phase state is reached, the water supply device is restarted without time. Then, the turbine driven water feed booster pump 5, the electric motor driven water feed booster pump 6, the turbine driven water feed pump 7, the electric motor driven water feed pump 8, and the water feed connecting pipes 16 and 17 between the water feed booster pump and the water feed pump and the water feed pipe 9 stay. The saturated steam that is being generated is pressurized, causing rapid condensation, which can result in water hammer and equipment damage.
【０００９】そこで、通常脱気器及び降水管中の給水を
常に循環置換させウォーターハンマーを抑制するため
に、脱気器降水管４と復水管１間を脱気器循環ポンプ１
８及び脱気器循環ポンプ出口弁１９を有する脱気器循環
管２０によって接続し、上記脱気器循環ポンプ１８を運
転して脱気器降水管４内の温水を脱気器循環管２０を介
して復水管１へ送り流体の置換を行うことも行われてい
る。Therefore, in order to constantly circulate and replace the water supply in the deaerator and the downcomer pipe to suppress the water hammer, the deaerator circulation pump 1 is provided between the deaerator downcomer pipe 4 and the condensate pipe 1.
8 and a deaerator circulation pipe 20 having a deaerator circulation pump outlet valve 19, and the deaerator circulation pump 18 is operated to transfer hot water in the deaerator downcomer pipe 4 to the deaerator circulation pipe 20. It is also practiced to replace the fluid sent to the condensate pipe 1 via the fluid.
【００１０】しかしながら、上記装置によっては脱気器
降水管４内のみしか温水の置換ができず、完全にウォー
ターハンマーを抑制することはできない等の問題があ
る。However, some of the above devices have a problem that the hot water can be replaced only in the deaerator downcomer 4, and the water hammer cannot be completely suppressed.
【００１１】上記脱気器循環ポンプ１８を設けない場合
は、電動機駆動給水ポンプ側は、給水ポンプとブースタ
ポンプが直結されていなくてもブースタポンプ６を運転
することにより、ミニマムフロー管１３を介して温水を
循環させ、温水を置換させることができる。また、ター
ビン駆動給水ポンプ側もブースタポンプと給水ポンプが
独立している場合は、ブースタポンプを運転し、ミニマ
ムフロー管１２を介して温水を循環させ温水を置換する
ことができる。When the deaerator circulation pump 18 is not provided, the electric motor drive feed water pump side operates the booster pump 6 by operating the booster pump 6 even if the feed water pump and the booster pump are not directly connected. Hot water can be circulated to replace the hot water. Further, when the booster pump and the water feed pump are also independent on the turbine-driven water feed pump side, the booster pump can be operated to circulate the hot water through the minimum flow pipe 12 to replace the hot water.
【００１２】しかし、ブースタポンプと給水ポンプが直
結されているタイプでは、負荷遮断によってタービンが
トリップした場合は、蒸気源がなくタービン駆動給水ブ
ースタポンプ５及びタービン駆動給水ポンプ７を運転す
ることはできず、タービン駆動給水ブースタポンプ５、
タービン駆動給水ポンプ７及び給水連結管１６内には温
水が残ってしまい、その結果ウォーターハンマーが発生
し、機器に損傷が生じる可能性が残る等の問題がある。However, in the type in which the booster pump and the feed water pump are directly connected, if the turbine trips due to load shedding, it is not possible to operate the turbine driven feed water booster pump 5 and the turbine driven feed water pump 7 without a steam source. No, turbine drive water supply booster pump 5,
There is a problem that hot water remains in the turbine-driven water supply pump 7 and the water supply connection pipe 16, resulting in a water hammer, which may cause damage to the equipment.
【００１３】本発明はこのような点に鑑み、脱気器降水
管、給水ブースタポンプ、給水ポンプ及び給水連結管内
の給水（温水）を早期に全量置換させ、ウォーターハン
マーの発生を効果的に抑制し得る給水装置を得ることを
目的とする。In view of the above point, the present invention replaces all of the water supply (hot water) in the deaerator downcomer pipe, the water supply booster pump, the water supply pump and the water supply connection pipe at an early stage to effectively suppress the occurrence of water hammer. The purpose is to obtain a possible water supply device.
【００１４】[0014]
【課題を解決するための手段】第１の発明は、脱気器貯
水タンクから脱気器降水管を通して送水される給水を給
水ブースタポンプ及び給水ポンプによって順次昇圧して
蒸気発生装置に供給するようにした蒸気タービンプラン
トにおける給水装置において、給水ブースタポンプと給
水ポンプの給水連絡管から脱気器入口復水管へ給水を送
水する脱気器循環ポンプを設けたことを特徴とする。The first aspect of the present invention is to supply the water supplied from the deaerator water storage tank through the deaerator downcomer pipe to the steam generator by successively increasing the pressure of the water supplied by the water supply booster pump and the water supply pump. In the water supply device of the steam turbine plant described above, a water supply booster pump and a deaerator circulation pump for supplying water from the water supply connection pipe of the water supply pump to the deaerator inlet condensate pipe are provided.
【００１５】第２の発明は、脱気器器内、及び給水ブー
スタポンプと給水ポンプとの連絡管内の温度、並びに上
記給水ブースタポンプと給水ポンプの停止条件により、
脱気器循環ポンプの起動、及び連絡管給水取水弁、給水
ポンプの再循環弁の開閉を操作する制御装置を設けたこ
とを特徴とする。According to a second aspect of the invention, the temperature inside the deaerator and the inside of the connecting pipe between the water supply booster pump and the water supply pump, and the stop condition of the water supply booster pump and the water supply pump,
A control device for operating the deaerator circulation pump and opening / closing the connecting pipe feed water intake valve and the recirculation valve of the feed pump is provided.
【００１６】また、第３の発明は、給水ブースタポンプ
と給水ポンプの連絡管に接続している脱気器循環ポンプ
の吸込管と、脱気器降水管とを、降水管給水取水弁を介
して接続したことを特徴とする。The third invention is that the suction pipe of the deaerator circulation pump, which is connected to the water supply booster pump and the connecting pipe of the water supply pump, and the deaerator downcomer pipe are connected via a downcomer water intake valve. It is characterized by being connected by.
【００１７】第４の発明は、脱気器降水管内の温度が給
水ブースタポンプと給水ポンプの連絡管内の温度より高
い場合に降水管給水取水弁が開かれ、上記連絡管内の温
度の方が高い場合に連絡管給水取出弁が開とされること
を特徴とする。In a fourth aspect of the invention, when the temperature in the deaerator downcomer pipe is higher than the temperature in the connecting pipe between the water supply booster pump and the water supply pump, the downcomer water intake valve is opened, and the temperature in the connecting pipe is higher. In this case, the connection pipe feed water extraction valve is opened.
【００１８】[0018]
【作用】負荷遮断等が発生し、脱気器循環ポンプが起動
すると、給水ブースタポンプと給水ポンプとの連結管内
の温水が脱気器入口復水管に還流される。したがって、
脱気器降水管ばかりではなく、給水ブースタポンプ、給
水ポンプ及び上記連絡管内の全ての温水が順次脱気器内
の水と置換される。したがって、脱気器器内圧力が降下
する過程において給水装置の系内でフラッシュが発生す
ることが防止され、給水装置の再起動時おけるウォータ
ーハンマーを防止することができる。When the deaerator circulation pump is activated due to load interruption or the like, the hot water in the connecting pipe between the water supply booster pump and the water supply pump is returned to the deaerator inlet condensate pipe. Therefore,
Not only the deaerator downcomer pipe, but all the hot water in the water supply booster pump, the water supply pump and the connecting pipe are sequentially replaced with the water in the deaerator. Therefore, it is possible to prevent a flush from occurring in the system of the water supply device during the process of lowering the pressure in the deaerator, and it is possible to prevent a water hammer when the water supply device is restarted.
【００１９】また、脱気器器内、及び給水ブースタポン
プと給水ポンプとの連絡管内の温度、並びに給水ブース
タポンプと給水ポンプの停止条件により、脱気器循環ポ
ンプの起動、及び連絡管給水取水弁、給水ポンプの再循
環弁の開閉を操作する制御装置を設けることにより、自
動的に上記連絡管内等の温水を置換することができる。Further, depending on the temperature inside the deaerator and the inside of the connecting pipe between the water supply booster pump and the water supply pump, and the stop condition of the water supply booster pump and the water supply pump, the deaerator circulation pump is started and the connecting pipe supply water intake By providing a control device for opening / closing the valve and the recirculation valve of the water supply pump, the hot water in the communication pipe can be automatically replaced.
【００２０】さらに、脱気器循環ポンプの吸込管を脱気
器降水管にも接続することにより、降水管及び連絡管の
両系統から温水の置換を効率的に行うことができる。し
かも降水管と連絡管との温度が高い側の給水取水弁を先
に開とすることにより、温度が高い側の温水を早く置換
することができ、温水の置換を効率的に行ない、給水装
置の再起動時におけるウォーターハンマーの発生を防止
することができる。Further, by connecting the suction pipe of the deaerator circulation pump to the deaerator downcomer pipe, the hot water can be efficiently replaced from both the downcomer pipe and the communication pipe system. In addition, by opening the water supply intake valve on the high temperature side of the downcomer pipe and the connecting pipe first, the hot water on the high temperature side can be replaced quickly, and the replacement of the hot water can be performed efficiently. It is possible to prevent the occurrence of a water hammer at the time of restart.
【００２１】[0021]
【実施例】以下、図１乃至図３を参照して本発明の実施
例について説明する。なお、図中図４と同一部分には同
一符号を付しその詳細な説明は省略する。Embodiments of the present invention will be described below with reference to FIGS. In the figure, the same parts as those in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.
【００２２】図１において、符号２１は脱気器循環ポン
プであって、その脱気器循環ポンプ２１の吸込管２２
は、タービン駆動給水ブースタポンプ５とタービン駆動
給水ポンプ７とを接続する連結管１６、及び電動機駆動
給水ブースタポンプ６と電動機駆動給水ポンプ８とを接
続する連結管１７にそれぞれ接続された給水ポンプウォ
ーミング管２３に接続されており、そのウォーミング管
２３を介して各連結管１６及び１７に接続されている。
そして、上記脱気器循環ポンプ２１の吸込管２２には連
結管給水取水弁２４が設けられている。In FIG. 1, reference numeral 21 is a deaerator circulation pump, and a suction pipe 22 of the deaerator circulation pump 21.
Is a connection pipe 16 that connects the turbine-driven water supply booster pump 5 and the turbine-driven water supply pump 7, and a connection pipe 17 that is connected to a connection pipe 17 that connects the motor-driven water supply booster pump 6 and the motor-driven water supply pump 8. The worming pipe 23 is connected to the connecting pipes 16 and 17 through the worming pipe 23.
The suction pipe 22 of the deaerator circulation pump 21 is provided with a connecting pipe feed water intake valve 24.
【００２３】一方、上記脱気器循環ポンプ２１の吐出管
２５には逆止弁２６及び脱気器循環ポンプ出口弁１９が
設けられ、その先端が脱気器２の入口側の復水管１に接
続されている。On the other hand, the discharge pipe 25 of the deaerator circulation pump 21 is provided with a check valve 26 and a deaerator circulation pump outlet valve 19, the tip of which is connected to the condenser pipe 1 on the inlet side of the deaerator 2. It is connected.
【００２４】また、脱気器２にはその器内温度を検出す
る脱気器器内温度計２７が設けられ、前記各連結管１
６，１７には各管内温度を検出する連絡管温度計２８，
２９がそれぞれ設けられている。上記各温度計２７，２
８，２９で検出された温度信号は、演算器３０に入力さ
れ、その演算器３０から連絡管給水取水弁２４、及び給
水ポンプ再循環弁１４，１５の開閉信号及び脱気器循環
ポンプ２１の起動停止信号を出力するようにしてある。Further, the deaerator 2 is provided with a deaerator thermometer 27 for detecting the temperature inside the deaerator 2, and each of the connecting pipes 1
6 and 17 are connecting pipe thermometers 28 for detecting the temperature inside each pipe,
29 are provided respectively. Each of the above thermometers 27, 2
The temperature signals detected at 8 and 29 are input to the calculator 30, and from the calculator 30 the opening / closing signals of the connecting pipe feed water intake valve 24 and the feed pump recirculation valves 14 and 15 and the deaerator circulation pump 21. A start / stop signal is output.
【００２５】しかして、今負荷遮断が発生すると、脱気
器２ではタービンからの抽気蒸気が遮断されるため、急
激な温度降下が起る。したがって、脱気器器内温度計２
７からその温度信号が演算器３０に送られる。そこで、
給水ブースタポンプ５，６、及び給水ポンプ７，８の停
止条件と、上記脱気器器内温度計２７からの温度信号が
連絡管温度計２８，２９からの連絡管１６，１７内の温
度信号より低いことが上記演算器３０で検知されると、
給水ポンプ再循環弁１４，１５に閉信号が出されるとと
もに、連絡管給水取水弁２４に開信号が出され、脱気器
循環ポンプ２１に起動信号が出力される。However, when the load is cut off now, the extracted steam from the turbine is cut off in the deaerator 2, so that a rapid temperature drop occurs. Therefore, the deaerator thermometer 2
The temperature signal from 7 is sent to the calculator 30. Therefore,
The stop conditions of the water supply booster pumps 5, 6 and the water supply pumps 7, 8 and the temperature signal from the deaerator thermometer 27 are the temperature signals in the communication pipes 16 and 17 from the communication pipe thermometers 28 and 29. When the lower value is detected by the arithmetic unit 30,
A close signal is output to the water supply pump recirculation valves 14 and 15, an open signal is output to the communication pipe feed water intake valve 24, and a start signal is output to the deaerator circulation pump 21.
【００２６】したがって、給水ポンプ再循環弁１４，１
５が閉じられるとともに連絡管給水取水弁２４が開とな
り、さらに脱気器循環ポンプ２１が起動する。これによ
り、連絡管１６，１７、タービン駆動給水ブースタポン
プ５、電動機駆動給水ブースタポンプ６、及び脱気器降
水管４内の温水が、順次脱気器再循環ポンプ２１によっ
て脱気器２側に還流され、温水の置換が行われてその温
度が低減される。したがって給水装置系内の飽和水のフ
ラッシュが抑制され、給水装置の再起動時におけるウォ
ーターハンマーの発生が防止される。Therefore, the water supply pump recirculation valves 14, 1
5 is closed, the connecting pipe feed water intake valve 24 is opened, and the deaerator circulation pump 21 is further activated. As a result, the hot water in the connecting pipes 16 and 17, the turbine-driven feed water booster pump 5, the electric motor-driven feed water booster pump 6, and the deaerator downcomer pipe 4 are sequentially transferred to the deaerator 2 side by the deaerator recirculation pump 21. It is refluxed and replaced with hot water to reduce its temperature. Therefore, flushing of saturated water in the water supply system is suppressed, and the occurrence of a water hammer when the water supply system is restarted is prevented.
【００２７】図２は本発明の他の実施例を示す図であ
り、脱気器循環ポンプ２１の吸込管２２がさらに、連絡
管給水取水弁２４の下流側において、脱気器降水管４と
降水管側吸込管３１によって接続され、その降水管側吸
込管３１には降水管給水取水弁３２が設けられている。FIG. 2 is a view showing another embodiment of the present invention, in which the suction pipe 22 of the deaerator circulation pump 21 is further connected to the deaerator downcomer pipe 4 on the downstream side of the connecting pipe feed water intake valve 24. The downcomer pipe side suction pipe 31 is connected, and the downcomer pipe side suction pipe 31 is provided with a downcomer pipe water intake valve 32.
【００２８】また、脱気器降水管４にはその降水管内の
温度を検出する降水管温度計３３が設けられており、そ
の降水管温度計３３によって検出された温度信号も前記
演算器３０に入力され、さらに前記降水管給水取水弁３
２は上記演算器３０からの制御信号により開閉制御され
るようにしてある。なお、その他の構成は図１に示すも
のと同一である。Further, the deaerator downcomer 4 is provided with a downcomer thermometer 33 for detecting the temperature in the downcomer, and the temperature signal detected by the downcomer thermometer 33 is also sent to the computing unit 30. Input, and the downcomer water intake valve 3
2 is controlled to be opened and closed by a control signal from the arithmetic unit 30. The other structure is the same as that shown in FIG.
【００２９】しかして、例えばプラントの負荷遮断が発
生し、給水ブースタポンプ５，６、及び給水ポンプ７，
８が停止すると、演算器３０で、降水管温度計３３によ
って検出された脱気器降水管４内の温度と、連絡管温度
計２８，２９で検出された連絡管１６，１７内の温度が
比較され、脱気器給水管４内の温度が連絡管２８，２９
内の温度より高い場合には、降水管給水取水弁３２がま
ず開かれ、脱気器循環ポンプ２１によって降水管４内の
温水が脱気器２側に循環され、温水の置換が行われる。Thus, for example, load shedding of the plant occurs, and the water supply booster pumps 5 and 6 and the water supply pump 7,
When 8 stops, the temperature inside the deaerator downcomer 4 detected by the downcomer thermometer 33 and the temperature inside the communication pipes 16 and 17 detected by the communication pipe thermometers 28 and 29 are calculated by the calculator 30. The temperature in the deaerator water supply pipe 4 is compared and the temperature of the connection pipes 28, 29 is compared.
When the temperature is higher than the internal temperature, the downcomer water intake valve 32 is first opened, and the hot water in the downcomer pipe 4 is circulated to the deaerator 2 side by the deaerator circulation pump 21 to replace the hot water.
【００３０】すなわち、図３は上記動作のブロック図で
あって、給水ポンプ及び給水ブースタポンプ全台停止す
るとともに、脱気器器内温度が連絡管内の温度より低く
かつ連絡管内の温度が脱気器降水管内温度以上である場
合には、給水ポンプ再循環弁１４，１５が全閉されると
ともに脱気器循環ポンプ２１が起動され、さらに連絡管
給水取水弁２４が全開され、降水管給水取水弁３２が全
閉される。したがって、この場合には連絡管１６，１７
内の温水が積極的に脱気器２に還流され、温水の置換が
行なわれる。That is, FIG. 3 is a block diagram of the above operation, in which all the water supply pumps and water supply booster pumps are stopped, the temperature inside the deaerator is lower than the temperature inside the communication pipe, and the temperature inside the communication pipe is degassed. When the temperature in the downcomer pipe is equal to or higher than the temperature inside the downcomer pipe, the water supply pump recirculation valves 14 and 15 are fully closed, the deaerator circulation pump 21 is activated, and further the communication pipe water intake valve 24 is fully opened, and the downfall pipe water intake The valve 32 is fully closed. Therefore, in this case, the connecting pipes 16, 17
The hot water therein is positively returned to the deaerator 2 to replace the hot water.
【００３１】一方、給水ポンプ及び給水ブースタポンプ
全台停止で、脱気器器内温度が脱気器降水管内温度より
低く、かつ脱気器降水管内温度が連絡管内温度より高い
場合には、前述のように給水ポンプ再循環弁１４，１５
が全閉され脱気器循環ポンプ２１が起動されるととも
に、降水管給水取水弁３２が全開され、連絡管給水取水
弁３２が全閉される。したがって、この場合には前述の
ように脱気器降水管４内の温水が脱気器２に還流され
る。On the other hand, when all the water supply pumps and the water supply booster pumps are stopped and the temperature inside the deaerator is lower than the temperature inside the deaerator downcomer and the temperature inside the deaerator down is higher than the temperature inside the connecting pipe, Water pump recirculation valves 14, 15 like
Is fully closed, the deaerator circulation pump 21 is activated, the downcomer pipe water intake valve 32 is fully opened, and the communication pipe water intake valve 32 is fully closed. Therefore, in this case, the warm water in the deaerator downcomer pipe 4 is returned to the deaerator 2 as described above.
【００３２】このように、脱気器降水管或は連絡管内の
温水が還流されると、その後は、常に温度が高い側の給
水取水弁が開き、温度が低い側の給水取水弁が閉じ、脱
気器降水管４、給水ブースタポンプ５，６、及び給水ポ
ンプ連絡管１６，１７の全ての温水の置換を効率的に行
うことができ、給水装置の再起動時におけるウォーター
ハンマーの発生を防止することができる。As described above, when the hot water in the deaerator downcomer pipe or the communication pipe is recirculated, thereafter, the water intake valve on the high temperature side always opens and the water intake valve on the low temperature side closes, All the hot water in the deaerator downcomer pipe 4, the water supply booster pumps 5 and 6, and the water supply pump connecting pipes 16 and 17 can be efficiently replaced, and a water hammer is prevented from occurring when the water supply device is restarted. can do.
【００３３】[0033]
【発明の効果】本発明は上述のように構成したので、停
止した給水装置で、脱気器器内圧力が低下し、器内温度
が低下する過程において、給水ブースタポンプ、給水ポ
ンプの連絡管及び脱気器降水管内の温水を脱気器循環ポ
ンプによって常に脱気器貯水タンク内の飽和水と置換す
ることができ、脱気器器内圧力が低下し、脱気器器内温
度が低下する過程における給水装置内のフラッシュを防
止することができる。したがって、給水装置の再起動時
のウォーターハンマーの発生を防止することができ、機
器の安全性を高めることができる。EFFECTS OF THE INVENTION Since the present invention is configured as described above, in a stopped water supply apparatus, in the process of lowering the internal pressure of the deaerator and the internal temperature of the deaerator, a connecting pipe for the water supply booster pump and the water supply pump. Also, the hot water in the deaerator downcomer can always be replaced with the saturated water in the deaerator water storage tank by the deaerator circulation pump, the pressure in the deaerator decreases and the temperature in the deaerator decreases. It is possible to prevent a flush in the water supply device in the process of doing. Therefore, it is possible to prevent the occurrence of a water hammer when the water supply device is restarted, and it is possible to enhance the safety of the device.
【図１】本発明の給水装置の一実施例を示す系統図。FIG. 1 is a system diagram showing an embodiment of a water supply device of the present invention.
【図２】本発明の他の実施例を示す系統図。FIG. 2 is a system diagram showing another embodiment of the present invention.
【図３】本発明の給水装置の制御動作を示すブロック
図。FIG. 3 is a block diagram showing a control operation of the water supply device of the present invention.
【図４】従来の給水装置の一例を示す系統図。FIG. 4 is a system diagram showing an example of a conventional water supply device.
１ 復水管 ２ 脱気器 ３ 貯水タンク ４ 脱気器降水管 ５ タービン駆動給水ブースタポンプ ６ 電動機駆動給水ブースタポンプ ７ タービン駆動給水ポンプ ８ 電動機駆動給水ポンプ １６，１７ 給水連絡管 ２１ 脱気器循環ポンプ ２２ 吸込管 ２４ 連絡管給水取水弁 ３０ 演算器 ３２ 降水管給水取水弁 1 Condensate Pipe 2 Deaerator 3 Water Storage Tank 4 Deaerator Precipitation Pipe 5 Turbine Drive Water Supply Booster Pump 6 Electric Motor Drive Water Supply Booster Pump 7 Turbine Drive Water Supply Pump 8 Electric Motor Drive Water Supply Pump 16, 17 Water Supply Connection Pipe 21 Deaerator Circulation Pump 22 Suction pipe 24 Communication pipe Water intake valve 30 Computing unit 32 Downcomer water intake valve
Claims (4)
て送水される給水を給水ブースタポンプ及び給水ポンプ
によって順次昇圧して蒸気発生装置に供給するようにし
た蒸気タービンプラントにおける給水装置において、給
水ブースタポンプと給水ポンプの給水連絡管から脱気器
入口復水管へ給水を送水する脱気器循環ポンプを設けた
ことを特徴とする蒸気タービンプラントにおける給水装
置。1. A water supply device in a steam turbine plant, wherein the supply water supplied from a deaerator water storage tank through a deaerator downcomer pipe is sequentially pressurized by a water supply booster pump and a water supply pump to be supplied to a steam generator. A water supply system in a steam turbine plant, comprising a water supply booster pump and a deaerator circulation pump for supplying water from a water supply connection pipe of the water supply pump to a deaerator inlet condensate pipe.
水ポンプとの連絡管内の温度、並びに上記給水ブースタ
ポンプと給水ポンプの停止条件により、脱気器循環ポン
プの起動、及び連絡管給水取水弁、給水ポンプの再循環
弁の開閉を操作する制御装置を設けたことを特徴とす
る、請求項１記載の蒸気タービンプラントにおける給水
装置。2. The deaerator circulation pump is started and the connecting pipe is supplied with water depending on the temperature in the deaerator and the connecting pipe between the water supply booster pump and the water supply pump and the stop condition of the water supply booster pump and the water supply pump. The water supply device in a steam turbine plant according to claim 1, further comprising a control device that operates opening and closing of a water intake valve and a recirculation valve of a water supply pump.
に接続している脱気器循環ポンプの吸込管と、脱気器降
水管とを、降水管給水取水弁を介して接続したことを特
徴とする、請求項１記載の蒸気タービンプラントにおけ
る給水装置。3. A suction pipe of a deaerator circulation pump connected to a water supply booster pump and a connecting pipe of the water supply pump, and a deaerator downcomer pipe are connected via a downcomer water intake valve. The water supply device in the steam turbine plant according to claim 1.
プと給水ポンプの連絡管内の温度より高い場合に降水管
給水取水弁が開かれ、上記連絡管内の温度の方が高い場
合に連絡管給水取出弁が開とされることを特徴とする、
請求項３記載の蒸気タービンプラントにおける給水装
置。4. The downcomer water intake valve is opened when the temperature in the deaerator downcomer pipe is higher than the temperature in the connecting pipe between the water booster pump and the water supply pump, and the connecting pipe is opened when the temperature in the connecting pipe is higher. The water supply valve is opened,
The water supply device in the steam turbine plant according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28193394A JP3619551B2 (en) | 1994-11-16 | 1994-11-16 | Water supply equipment in a steam turbine plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28193394A JP3619551B2 (en) | 1994-11-16 | 1994-11-16 | Water supply equipment in a steam turbine plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08144708A true JPH08144708A (en) | 1996-06-04 |
| JP3619551B2 JP3619551B2 (en) | 2005-02-09 |
Family
ID=17645963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28193394A Expired - Fee Related JP3619551B2 (en) | 1994-11-16 | 1994-11-16 | Water supply equipment in a steam turbine plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3619551B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482731A (en) * | 2021-07-19 | 2021-10-08 | 内蒙古京泰发电有限责任公司 | Synchronous adjustable water supply system based on turbo generator unit |
-
1994
- 1994-11-16 JP JP28193394A patent/JP3619551B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482731A (en) * | 2021-07-19 | 2021-10-08 | 内蒙古京泰发电有限责任公司 | Synchronous adjustable water supply system based on turbo generator unit |
| CN113482731B (en) * | 2021-07-19 | 2022-10-14 | 内蒙古京泰发电有限责任公司 | Synchronous adjustable water supply system based on turbo generator unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3619551B2 (en) | 2005-02-09 |
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