JPS6284205A - Boiler feedwater-pump antiflashing controller - Google Patents
Boiler feedwater-pump antiflashing controllerInfo
- Publication number
- JPS6284205A JPS6284205A JP22362385A JP22362385A JPS6284205A JP S6284205 A JPS6284205 A JP S6284205A JP 22362385 A JP22362385 A JP 22362385A JP 22362385 A JP22362385 A JP 22362385A JP S6284205 A JPS6284205 A JP S6284205A
- Authority
- JP
- Japan
- Prior art keywords
- feed water
- pump
- boiler feed
- deaerator
- water
- 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.)
- Pending
Links
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の利用分野〕
火力プラントにおいて脱気器出口からボイラ給水ポンプ
入口までの降水管を有するプラントにおいて、プラント
トリップ時の再起動には欠くことの出来ない制御装置で
ある。[Detailed Description of the Invention] [Field of Application of the Invention] This invention is an indispensable control device for restarting the plant in the event of a plant trip in a thermal power plant having a downcomer pipe from the deaerator outlet to the boiler feed water pump inlet. be.
公知例として実開昭６０−６９０６号による方法は、ボ
イラ給水ポンプ入口に入れる封水でポンプ内の熱水を置
換する方法を提案しているが封水量には制限があり、置
換するまでにかなりの時間を有する。したがって迅速な
プラント再起動を行う場合フラッシュ現象を防止するこ
とは困難である。As a known example, the method disclosed in Japanese Utility Model Application Publication No. 60-6906 proposes a method of replacing hot water in the pump with sealed water introduced into the inlet of the boiler feed water pump, but there is a limit to the amount of sealed water, and it takes a long time to replace the hot water. have a considerable amount of time. Therefore, it is difficult to prevent the flash phenomenon when restarting the plant quickly.
本発明の目的は、プラントトリップ時に停止したボイラ
給水ポンプあるいは待機中のボイラ給水ポンプに停滞す
る給水を置換することにより、プラント再起動時に発生
する滞溜水の蒸発を防止し、プラントの急速再起動を可
能とする。The purpose of the present invention is to prevent the evaporation of stagnant water that occurs when the plant is restarted by replacing the stagnant water supply in the boiler feed pump that has stopped or is on standby during a plant trip, and to rapidly restart the plant. Enables startup.
プラントリップ時には、ボイラ給水ポンプが全台停止す
るため、ボイラ給水ポンプ内には熱水が滞溜水として残
る。プラント再起動にはボイラ給水ポンプには低圧、低
温の給水が入るため滞溜水とまじり合い蒸発する。した
がって解決策としてプラントトリップ時に脱気内の給水
温度、圧力を徐々に低下させると同時にボイラ給水ポン
プ内の滞溜水を脱器内の給水と置換しプラント再起動時
の蒸発を防止する。During a plant trip, all boiler feed pumps stop, so hot water remains in the boiler feed pump as stagnant water. When the plant is restarted, low-pressure, low-temperature water enters the boiler feed pump, which mixes with the accumulated water and evaporates. Therefore, as a solution, when the plant is tripped, the temperature and pressure of the feed water in the deaerator are gradually lowered, and at the same time, the accumulated water in the boiler feed water pump is replaced with the feed water in the degasser to prevent evaporation when the plant is restarted.
本発明になるボイラ給水ポンプ置換制御装置の実施例を
説明する。An embodiment of the boiler feed water pump replacement control device according to the present invention will be described.
第１図に火力プラントの代表系統を示す。復水ｉｌｌか
らの復水は復水ポンプ２．低圧給水加熱器３．４を通り
復水昇圧ポンプ５により昇圧され、低圧給水加熱器６，
７を通り脱気器８へ送水される。Figure 1 shows a typical system of a thermal power plant. Condensate from the condensate ill is supplied to a condensate pump 2. The pressure is increased by the condensate boost pump 5 through the low pressure feed water heater 3.4, and the pressure is increased by the low pressure feed water heater 6,
7 and is sent to the deaerator 8.
脱気器より降水管９を通り、ボイラ給水ポンプ入口弁１
０，１１，１２、ボイラ給水昇圧ポンプ１６゜１７．１
８、ボイラ給水ポンプ１９，２０．２１およびボイラ給
水ポンプ出口弁２２，２３．２４をへてボイラへと送水
される。又クリーンアップを目的とし脱気器より復水器
に戻るラインに循環弁２５が設置される０、プラントト
リップ時にはボイラ給水ポンプは全台停止し、ボイラ給
水ポンプ入口からボイラ給水ポンプ出口弁までの配管に
はプラントリップ時の運転状態における脱気器内給水温
度に相当する給水が停滞する。一方プラントトリップに
より低圧給水加熱器への蒸気はしゃ断される。したがっ
て、プラント再起動時においては、復水ポンプ、復水昇
圧ポンプ、低圧給水加熱器を通して脱気器に入る給水は
プラント運転時に比較し低温となるためボイラ給水ポン
プを起動し、ボイラ側へ送水開始時に停止中のボイラ給
水昇圧ポンプ１６に停滞している給水と降水管を通して
入る給水がまじり合いフラッシュ現象が発生し運転中の
給水ポンプ入口に吸込まれポンプキャビテーションを起
こす原因となる。Pass through the downcomer pipe 9 from the deaerator to the boiler feed water pump inlet valve 1
0,11,12, Boiler feed water boost pump 16°17.1
8. Water is sent to the boiler through the boiler feed pump 19, 20.21 and the boiler feed water pump outlet valve 22, 23.24. In addition, a circulation valve 25 is installed in the line returning from the deaerator to the condenser for the purpose of cleanup.In the event of a plant trip, all boiler feed pumps are stopped, and the line from the boiler feed pump inlet to the boiler feed water pump outlet valve is In the piping, water stagnates at a temperature corresponding to the water supply temperature in the deaerator in the operating state during a plant trip. On the other hand, a plant trip cuts off the steam to the low pressure feed water heater. Therefore, when restarting the plant, the water that enters the deaerator through the condensate pump, condensate boost pump, and low-pressure feed water heater will be at a lower temperature than when the plant is operating, so the boiler feed water pump is started and water is sent to the boiler. At the start, the water stagnant in the stopped boiler feed water boost pump 16 and the water entering through the downcomer pipe mix, causing a flash phenomenon, which is sucked into the inlet of the running water pump, causing pump cavitation.
第２図において考え方を説明する。ボイラ給水ポンプ２
１の出口よりボイラ給水昇圧ポンプ１６゜１７の入口に
接続する配管を設は電動弁２７を設置する。一方ボイラ
給水ポンプ１９，２０の出口から復水管に接続する配管
を設は電動弁２６を設置する。プラントトリップ時に電
動弁２５を中間開度に関し、復水ポンプ復水昇圧ポンプ
、低圧給水加熱器、脱気器、復水器の系統に水の流れを
作り脱気器内の温度を徐々に低下させる。一方電動弁２
７を開、ボイラ給水ポンプ人口弁１０．１１を開し、ボ
イラ給水昇圧ポンプを起動し、°復水管に戻るラインの
電動弁２６を開とする。脱気器内の給水温度を電動弁２
５を開することにより徐々に低下させ、ボイラ給水ポン
プ内に停滞する熱水は電動給水昇圧ポンプ１６，１７、
ボイラ給水ポンプ１９，２０および電動弁２６を通り徐
々に冷却される脱気器給水と置換し、配管内に停滞する
給水を一定時間内に置換する。以上述べたような操作に
より脱気器内の給水温度を徐々に低下させボイラ給水ポ
ンプ内の熱水を置換することによりプラント再起動時に
おけるフラッシュ現象を防止することが可能である。The concept will be explained in Figure 2. Boiler feed pump 2
1, and a motor-operated valve 27 is installed. On the other hand, piping connecting the outlet of the boiler feed pumps 19 and 20 to the condensate pipe is installed, and an electric valve 26 is installed. At the time of plant trip, the electric valve 25 is set to an intermediate opening degree to create water flow in the condensate pump, condensate boost pump, low-pressure feed water heater, deaerator, and condenser system, and gradually lower the temperature inside the deaerator. let One side electric valve 2
7, open the boiler feed water pump population valve 10.11, start the boiler feed water boost pump, and open the electric valve 26 on the line returning to the condensate pipe. Electric valve 2 controls the temperature of the water supply inside the deaerator.
The hot water stagnant in the boiler feed water pump is gradually lowered by opening the electric water feed water boost pumps 16, 17,
It is replaced with deaerator feed water that passes through the boiler feed water pumps 19, 20 and the electric valve 26 and is gradually cooled, and the feed water stagnant in the piping is replaced within a certain period of time. By gradually lowering the temperature of the feed water in the deaerator and replacing the hot water in the boiler feed water pump through the operations described above, it is possible to prevent the flash phenomenon at the time of restarting the plant.
第３図に制御装置の内容を示す。タービントリップ信号
２８により、循環弁２５を規則開度まで開し、ボイラ給
水ポンプ人口弁１０．１１を閉し、タービントリップ信
号２８と循環弁閉ボイラ給水ポンプ人口弁閉を確認し、
ボイラ給水昇圧ポンプ１５を起動し、電動弁２６．２７
を開とする。電動弁２６．２７を開した後にボイラ給水
ボン・プ内給水が置換される時間をタイマ２９で確認し
た後電動弁２６．２７を閉し、ボイラ給水ポンプを停止
し、ボイラ給水ポンプ入口弁１０．１１を閉、循環弁２
５を閉とし、再起動可能に状態に系統を復帰させる。Figure 3 shows the contents of the control device. In response to the turbine trip signal 28, the circulation valve 25 is opened to the regular opening degree, the boiler feed water pump population valve 10.11 is closed, and the turbine trip signal 28 and the circulation valve closed are confirmed.
Start the boiler feed water boost pump 15, and operate the electric valve 26.27.
Let's open. After opening the electric valves 26 and 27, the timer 29 confirms the time for the water supply in the boiler feed water pump to be replaced, and then the electric valves 26 and 27 are closed, the boiler water pump is stopped, and the boiler feed water pump inlet valve 10 is closed. .11 closed, circulation valve 2
5 is closed and the system is returned to a state where it can be restarted.
〔発明の効果〕
プラントトリップ時に、ボイラ給水ポンプ内の滞溜水を
早く置換することにより、プラント再起動時の蒸発を防
止しプラント急速再起動が可能となる。[Effects of the Invention] By rapidly replacing the accumulated water in the boiler feed pump during a plant trip, evaporation at the time of restarting the plant is prevented and rapid restart of the plant becomes possible.
第１Ｗｉは火力プラントの給復水系統を示す。第２図は
本発明の給復水系統を示す。第３図は本発明における制
御回路を示す。
１・・・復水器、２・・・復水ポンプ、３，４・・・低
圧給水加熱器、５・・・復水昇圧ポンプ、６，７・・・
低圧給水加熱器、８・・・脱気器、９・・・降水管、１
０．１１゜１２・・・ボイラ給水ポンプ人口弁、１６，
１７゜１８ボイラ給水昇圧ポンプ、１９，２０．２１・
・・ボイラ給水ポンプ、２２，２３．２４・・・ボイラ
給水ポンプ出口弁、２５・・・循環弁、２６・・・電動
弁、２７・・・電動弁、２８・・・プラントトリップ信
号、２９・・・タイマー。1st Wi shows the water supply and condensation system of the thermal power plant. FIG. 2 shows the water supply and condensation system of the present invention. FIG. 3 shows a control circuit in the present invention. 1... Condenser, 2... Condensate pump, 3, 4... Low pressure feed water heater, 5... Condensate boost pump, 6, 7...
Low-pressure feed water heater, 8... Deaerator, 9... Downpipe, 1
0.11゜12...Boiler feed water pump population valve, 16,
17゜18 Boiler feed water boost pump, 19,20.21・
...Boiler feed water pump, 22, 23. 24... Boiler feed water pump outlet valve, 25... Circulation valve, 26... Electric valve, 27... Electric valve, 28... Plant trip signal, 29 ···timer.
Claims (1)
ポンプ出口弁における配管内に停滞する給水をボイラ給
水昇圧ポンプ、ボイラ給水ポンプ出口から他ボイラ給水
ポンプ入口と出口に接続する配管と、これに設置する電
動弁および復水器に戻す系統に設置される電動弁におい
て、プラントトリップ信号を検出し、ボイラ給水昇圧ポ
ンプを起動し復水器に戻す系統に設置される電動弁およ
びボイラ給水ポンプ出口から他ボイラ給水ポンプ入口と
出口に接続される配管に設置する電動弁を開することに
より、脱気器貯水タンク内の給水圧力温度を低下させ、
脱気器出口からボイラ給水ポンプ出口までに停滞する給
水を脱気器の低圧低温の給水に置換しプラント再起動に
ボイラ給水ポンプ入口で発生するフラッシュ現象を防止
することを特徴とするボイラ給水ポンプフラッシュ防止
制御装置。1. In a thermal power plant, the supply water stagnant in the piping from the deaerator outlet to the boiler feed water pump outlet valve is connected to the boiler feed water boost pump, the piping that connects the boiler feed water pump outlet to the other boiler feed water pump inlets and outlets, and installation thereof. The motorized valve installed in the system returning to the condenser and the motorized valve installed in the system returning to the condenser detects a plant trip signal and starts the boiler feedwater boost pump. By opening the electric valve installed in the piping connected to the inlet and outlet of the other boiler feed water pumps, the pressure and temperature of the water supply in the deaerator water storage tank is reduced.
A boiler feed pump characterized in that the feed water stagnant between the deaerator outlet and the boiler feed water pump outlet is replaced with low-pressure, low-temperature feed water from the deaerator to prevent a flash phenomenon that occurs at the boiler feed water pump inlet when restarting the plant. Anti-flash control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22362385A JPS6284205A (en) | 1985-10-09 | 1985-10-09 | Boiler feedwater-pump antiflashing controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22362385A JPS6284205A (en) | 1985-10-09 | 1985-10-09 | Boiler feedwater-pump antiflashing controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6284205A true JPS6284205A (en) | 1987-04-17 |
Family
ID=16801107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22362385A Pending JPS6284205A (en) | 1985-10-09 | 1985-10-09 | Boiler feedwater-pump antiflashing controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6284205A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014196891A (en) * | 2013-03-29 | 2014-10-16 | 株式会社東芝 | Water recirculating operation equipment and water recirculating operation method |
-
1985
- 1985-10-09 JP JP22362385A patent/JPS6284205A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014196891A (en) * | 2013-03-29 | 2014-10-16 | 株式会社東芝 | Water recirculating operation equipment and water recirculating operation method |
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