JP4926441B2 - Method and system for isolating a steam driven feed pump - Google Patents

Method and system for isolating a steam driven feed pump Download PDF

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JP4926441B2
JP4926441B2 JP2005291854A JP2005291854A JP4926441B2 JP 4926441 B2 JP4926441 B2 JP 4926441B2 JP 2005291854 A JP2005291854 A JP 2005291854A JP 2005291854 A JP2005291854 A JP 2005291854A JP 4926441 B2 JP4926441 B2 JP 4926441B2
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steam
feed water
water pump
steam turbine
driven feed
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JP2007100597A (en
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賢治 得利
俊宏 清水
省吾 柴田
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Chugoku Electric Power Co Inc
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Description

本発明は、蒸気駆動給水ポンプを給水系統から遮断する蒸気駆動給水ポンプのアイソレート方法及びそのシステムに関する。   The present invention relates to a method for isolating a steam-driven water supply pump that shuts off the steam-driven water pump from a water supply system, and a system thereof.

蒸気タービンプラントにおいて、主蒸気タービンから抽気した蒸気を用いてタービンを駆動しボイラーに給水する蒸気駆動給水ポンプが用いられている。この蒸気駆動給水ポンプは、定期点検やメンテナンス時に給水ポンプ内の水を抜き取る必要がある。従来、蒸気駆動給水ポンプの水抜き作業は、給水ポンプ駆動用の蒸気タービンを停止した後、直ちに給水ポンプを給水系統から遮断して内部の水を排出していた。   In a steam turbine plant, a steam-driven feed water pump that drives a turbine using steam extracted from a main steam turbine and supplies water to a boiler is used. This steam-driven feed water pump needs to drain water from the feed water pump during periodic inspection and maintenance. Conventionally, the operation of draining the steam-driven feed water pump has been to immediately shut off the feed water pump from the feed water system after the steam turbine for driving the feed water pump is stopped and discharge the water inside.

しかし、蒸気駆動給水ポンプは、蒸気タービンの熱により高温になっているため、蒸気タービンの停止後、直ちに給水ポンプを給水系統から遮断して内部の水を排出すると、高温・高圧の水が噴出して作業員に火傷等の危険が及ぶ恐れがあるのみならず、蒸気タービンの熱により変形し給水ポンプの動翼を損傷する恐れがあるという課題があった。   However, since the steam-driven feed water pump is hot due to the heat of the steam turbine, immediately after shutting down the steam turbine, if the feed water pump is shut off from the feed water system and the internal water is discharged, the high-temperature and high-pressure water spouts out. As a result, there is a problem that not only there may be a risk of burns or the like to workers, but there is also a risk that the blades of the feed water pump may be damaged due to deformation due to the heat of the steam turbine.

本発明は、上記課題を解決するために、蒸気駆動給水ポンプを給水系統から遮断する蒸気駆動給水ポンプのアイソレート方法であって、前記蒸気駆動給水ポンプを駆動する蒸気タービンを停止させてターニング運転に移行し、前記蒸気タービンの真空破壊を行って、前記蒸気タービン及び蒸気駆動給水ポンプを冷却した後、前記蒸気タービンのターニング運転を停止し、前記蒸気駆動給水ポンプを給水系統から遮断して内部の水を排出するようにした蒸気駆動給水ポンプのアイソレート方法を提供するものである。   In order to solve the above-mentioned problem, the present invention provides a method for isolating a steam-driven feed water pump that shuts off the steam-driven feed water pump from a feed water system, wherein the steam turbine that drives the steam-driven feed water pump is stopped to perform a turning operation. The steam turbine is subjected to vacuum breakage, the steam turbine and the steam-driven feedwater pump are cooled, the turning operation of the steam turbine is stopped, and the steam-driven feedwater pump is shut off from the water supply system to It is intended to provide an isolation method for a steam-driven feed water pump that discharges water.

また、本発明は、前記蒸気タービン及び蒸気駆動給水ポンプが所定温度以下まで冷却されたことを確認する冷却確認手段を備えた請求項1に記載の蒸気駆動給水ポンプのアイソレート方法を提供するものである。   Further, the present invention provides a method for isolating a steam-driven water pump according to claim 1, further comprising a cooling confirmation means for confirming that the steam turbine and the steam-driven water pump are cooled to a predetermined temperature or lower. It is.

また、本発明は、蒸気駆動給水ポンプを給水系統から遮断する蒸気駆動給水ポンプのアイソレートシステムであって、前記蒸気駆動給水ポンプを駆動する蒸気タービンを停止させてターニング運転に移行するターニング運転移行手段と、前記蒸気タービンの真空破壊を行う真空破壊手段と、前記蒸気タービン及び蒸気駆動給水ポンプを冷却する冷却手段と、前記蒸気タービンのターニング運転を停止するターニング運転停止手段と、前記蒸気駆動給水ポンプを給水系統から遮断して内部の水を排出するアイソレート手段とからなる蒸気駆動給水ポンプのアイソレートシステムを提供するものである。   Further, the present invention is an isolation system for a steam-driven feed water pump that shuts off the steam-driven feed water pump from the feed water system, and stops the steam turbine that drives the steam-driven feed water pump and shifts to a turning operation. Means, vacuum breaking means for breaking the vacuum of the steam turbine, cooling means for cooling the steam turbine and the steam driven feed water pump, turning operation stopping means for stopping the turning operation of the steam turbine, and the steam driven feed water An isolating system for a steam-driven feed water pump comprising an isolating means for shutting off the pump from a feed water system and discharging internal water.

また、本発明は、前記冷却手段が、前記蒸気タービン及び蒸気駆動給水ポンプの温度が所定温度以下になるまで冷却するようにした請求項3に記載の蒸気駆動給水ポンプのアイソレートシステムを提供するものである。   Further, the present invention provides the steam-driven feed water pump isolation system according to claim 3, wherein the cooling means cools the steam turbine and the steam-driven feed pump until the temperatures of the steam turbine and the steam-driven feed pump become equal to or lower than a predetermined temperature. Is.

本発明に係る蒸気駆動給水ポンプのアイソレート方法によれば、蒸気駆動給水ポンプを給水系統から遮断する蒸気駆動給水ポンプのアイソレート方法であって、前記蒸気駆動給水ポンプを駆動する蒸気タービンを停止させてターニング運転に移行し、前記蒸気タービンの真空破壊を行って、前記蒸気タービン及び蒸気駆動給水ポンプを冷却した後、前記蒸気タービンのターニング運転を停止し、前記蒸気駆動給水ポンプを給水系統から遮断して内部の水を排出するようにした構成を有することにより、蒸気タービンの熱による変形を低減して動翼の損傷を防止することができると共に、給水ポンプの排水時に高温・高圧の水が噴出することなく、安全に蒸気駆動給水ポンプのアイソレートを行うことができる効果がある。   According to the method for isolating a steam-driven water pump according to the present invention, the method for isolating a steam-driven water pump that shuts off the steam-driven water pump from the water supply system, the steam turbine that drives the steam-driven water pump is stopped. The steam turbine and the steam-driven feedwater pump are cooled, and then the steam turbine is turned off and the steam-driven feedwater pump is removed from the water supply system. By having a configuration that shuts off and discharges the internal water, it is possible to prevent deformation of the steam turbine by preventing deformation of the steam turbine, and to prevent damage to the rotor blades. There is an effect that it is possible to safely isolate the steam-driven feed water pump without spraying.

また、本発明は、前記蒸気タービン及び蒸気駆動給水ポンプが所定温度以下まで冷却されたことを確認する冷却確認手段を備えた請求項1に記載の構成を有することにより、蒸気タービン及び蒸気駆動給水ポンプを確実に冷却することができる効果がある。   Moreover, this invention has the structure of Claim 1 provided with the cooling confirmation means which confirms that the said steam turbine and the steam drive feed water pump were cooled to below predetermined temperature, A steam turbine and a steam drive feed water There is an effect that the pump can be reliably cooled.

また、本発明に係る蒸気駆動給水ポンプのアイソレートシステムによれば、蒸気駆動給水ポンプを給水系統から遮断する蒸気駆動給水ポンプのアイソレートシステムであって、前記蒸気駆動給水ポンプを駆動する蒸気タービンを停止させてターニング運転に移行するターニング運転移行手段と、前記蒸気タービンの真空破壊を行う真空破壊手段と、前記蒸気タービン及び蒸気駆動給水ポンプを冷却する冷却手段と、前記蒸気タービンのターニング運転を停止するターニング運転停止手段と、前記蒸気駆動給水ポンプを給水系統から遮断して内部の水を排出するアイソレート手段とからなる構成を有することにより、蒸気タービンの熱による変形を低減して動翼の損傷を防止することができると共に、給水ポンプの排水時に高温・高圧の水が噴出することなく、安全に蒸気駆動給水ポンプのアイソレートを行うことができる効果がある。   The steam-driven feed water pump isolation system according to the present invention is a steam-driven feed water pump isolation system that shuts off the steam-driven feed water pump from the feed water system, the steam turbine driving the steam-driven feed water pump A turning operation shifting means for stopping the operation of the steam turbine, a vacuum breaking means for breaking the vacuum of the steam turbine, a cooling means for cooling the steam turbine and the steam-driven feed water pump, and a turning operation of the steam turbine. By having a configuration comprising a turning operation stopping means for stopping and an isolating means for shutting off the steam-driven water supply pump from the water supply system and discharging the internal water, the deformation of the steam turbine due to heat is reduced and the moving blade Can be prevented, and high-temperature and high-pressure water is sprayed when draining the water supply pump. Without safely embodiment offers the advantage of being able to perform an isolation of the steam-driven feedwater pump.

また、本発明は、前記冷却手段が、前記蒸気タービン及び蒸気駆動給水ポンプの温度が所定温度以下になるまで冷却するようにした請求項3に記載の構成を有することにより、蒸気タービン及び蒸気駆動給水ポンプを確実に冷却することができる効果がある。   Further, the present invention provides the steam turbine and the steam drive by having the configuration according to claim 3, wherein the cooling means cools until the temperature of the steam turbine and the steam drive feed water pump becomes a predetermined temperature or less. There exists an effect which can cool a feed water pump reliably.

本発明の実施の形態を図示する実施例に基づいて説明する。
本発明に係る蒸気駆動給水ポンプのアイソレートシステムは、蒸気駆動給水ポンプ11を駆動する蒸気タービン12を停止させてターニング運転に移行するターニング運転移行手段1と、前記蒸気タービン12の真空破壊を行う真空破壊手段2と、前記蒸気タービン12及び蒸気駆動給水ポンプ11を冷却する冷却手段3と、前記蒸気タービン12のターニング運転を停止するターニング運転停止手段4と、前記蒸気駆動給水ポンプ11を給水系統から遮断して内部の水を排出するアイソレート手段5とから構成してある。
Embodiments of the present invention will be described based on examples shown in the drawings.
The isolation system for a steam-driven feed water pump according to the present invention stops the steam turbine 12 that drives the steam-driven feed water pump 11 to shift to a turning operation, and performs a vacuum break of the steam turbine 12. A vacuum breaker 2, a cooling unit 3 for cooling the steam turbine 12 and the steam driven feed water pump 11, a turning operation stop unit 4 for stopping the turning operation of the steam turbine 12, and the steam driven feed pump 11 are connected to the water supply system. It is comprised from the isolation means 5 which interrupts | blocks from and discharges internal water.

実施例において、蒸気タービンプラントの給水ポンプ装置は、図2に示すように構成している。蒸気駆動給水ポンプ11は、主蒸気タービンから低圧主蒸気管13を通って抽気した蒸気によって蒸気タービン12を回転させて、該蒸気タービン12に接続された給水ポンプを駆動するようにしてある。蒸気タービン12を回転させた蒸気は、排気管14を通って復水器15に排出される。
また、22はモーター21により駆動される給水ブースターポンプであり、復水を昇圧して蒸気駆動給水ポンプ11に導入するようにしている。蒸気駆動給水ポンプ11は、腹水を更に昇圧してボイラーへ給水するようにしている。
In the embodiment, the feed water pump device of the steam turbine plant is configured as shown in FIG. The steam-driven feed water pump 11 rotates the steam turbine 12 with steam extracted from the main steam turbine through the low-pressure main steam pipe 13 to drive the feed water pump connected to the steam turbine 12. The steam that has rotated the steam turbine 12 is discharged to the condenser 15 through the exhaust pipe 14.
Reference numeral 22 denotes a feed water booster pump driven by a motor 21, which boosts the condensate and introduces it into the steam driven feed water pump 11. The steam driven water supply pump 11 further increases the pressure of ascites to supply water to the boiler.

図1に示す実施例において、ターニング運転移行手段1は、蒸気駆動給水ポンプ11を駆動する蒸気タービン12を停止させ、ターニング装置により蒸気タービン12のローターを低速で回転させるようにしてある。この蒸気タービン12の回転に伴って、蒸気駆動給水ポンプ11の動翼も低速で回転するようにしている。
また、真空破壊手段2は、真空破壊弁16を開いて、蒸気タービン12と復水器15の真空破壊を行うようにしてある。
In the embodiment shown in FIG. 1, the turning operation transition means 1 stops the steam turbine 12 that drives the steam-driven feed water pump 11 and rotates the rotor of the steam turbine 12 at a low speed by the turning device. As the steam turbine 12 rotates, the moving blades of the steam-driven feed water pump 11 also rotate at a low speed.
Further, the vacuum breaker 2 opens the vacuum breaker valve 16 so as to break the vacuum of the steam turbine 12 and the condenser 15.

図1に示す実施例において、冷却手段3は、ウォーミング元弁19を閉じ、ターニング運転により蒸気タービン12のローター及び蒸気駆動給水ポンプ11の動翼を低速で回転させて、蒸気タービン12及び蒸気駆動給水ポンプ11を冷却することができるように構成してある。また、封水温度調節弁17をバイパスするバイパス弁18を開き、低温の封水を蒸気駆動給水ポンプ11に供給して、冷却効率を高めるようにしてある。   In the embodiment shown in FIG. 1, the cooling means 3 closes the warming main valve 19 and rotates the rotor of the steam turbine 12 and the moving blades of the steam-driven feed water pump 11 at a low speed by turning operation. The drive water pump 11 is configured to be cooled. Further, the bypass valve 18 that bypasses the sealed water temperature control valve 17 is opened, and low-temperature sealed water is supplied to the steam-driven feed water pump 11 so as to increase the cooling efficiency.

また、冷却手段3は、蒸気タービン12及び蒸気駆動給水ポンプ11の周囲に温度センサーを設けて、蒸気タービン12及び蒸気駆動給水ポンプ11の温度が所定温度以下になるまで冷却することができるように構成してある。実施例の場合、蒸気タービン12のケーシング温度が200℃以下で、且つ、給水ポンプ11の下部バレルの温度が50℃以下になるまで冷却するようにしてある。
なお、冷却手段3の冷却期間は上記温度に限定されるものではないが、蒸気駆動給水ポンプ11の下部バレルの温度が60℃位で冷却を終了すると、給水ポンプ11内の水を排水した後に予熱でバレルの温度が約30℃上昇して連絡管がハンマを起こすことから、給水ポンプ11の下部バレルの温度が50℃以下になるまで冷却することが好ましい。
Further, the cooling means 3 is provided with a temperature sensor around the steam turbine 12 and the steam driven feed water pump 11 so that the temperature of the steam turbine 12 and the steam driven feed water pump 11 can be cooled to a predetermined temperature or less. It is configured. In the embodiment, cooling is performed until the casing temperature of the steam turbine 12 is 200 ° C. or lower and the temperature of the lower barrel of the feed water pump 11 is 50 ° C. or lower.
In addition, although the cooling period of the cooling means 3 is not limited to the said temperature, after the temperature of the lower barrel of the steam drive feed water pump 11 is about 60 ° C. and the cooling is finished, the water in the feed water pump 11 is drained. Since the temperature of the barrel rises by about 30 ° C. due to preheating and the connecting pipe is hammered, it is preferable to cool until the temperature of the lower barrel of the feed water pump 11 becomes 50 ° C. or less.

図1に示す実施例において、ターニング運転停止手段4は、温度センサーにより蒸気タービン及び蒸気駆動給水ポンプの温度が所定温度以下になったことを検知すると、蒸気タービン12のターニング運転を停止するようにしてある。
アイソレート手段5は、蒸気タービン12のターニング運転を停止すると、蒸気駆動給水ポンプ11を給水系統20から遮断し、給水ポンプ11の内部の水を排出するようにしてある。
In the embodiment shown in FIG. 1, the turning operation stopping means 4 stops the turning operation of the steam turbine 12 when the temperature sensor detects that the temperature of the steam turbine and the steam driven feed water pump is equal to or lower than a predetermined temperature. It is.
When the turning operation of the steam turbine 12 is stopped, the isolation means 5 shuts off the steam-driven water supply pump 11 from the water supply system 20 and discharges the water inside the water supply pump 11.

本発明蒸気駆動給水ポンプのアイソレートシステムの一実施例を示すフローチャート。The flowchart which shows one Example of the isolation system of this invention steam drive feed water pump. その一実施例の給水ポンプ装置を示す系統図。The systematic diagram which shows the feed water pump apparatus of the one Example.

符号の説明Explanation of symbols

1 ターニング運転移行手段
2 真空破壊手段
3 冷却手段
4 ターニング運転停止手段
5 アイソレート手段
11 蒸気駆動給水ポンプ
12 蒸気タービン
13 低圧主蒸気管
14 排気管
15 腹水器
16 真空破壊弁
17 封水温度調節弁
18 バイパス弁
19 ウォーミング元弁
20 給水系統
21 モーター
22 給水ブースターポンプ
DESCRIPTION OF SYMBOLS 1 Turning operation transfer means 2 Vacuum breaking means 3 Cooling means 4 Turning operation stop means 5 Isolation means 11 Steam drive feed pump 12 Steam turbine 13 Low pressure main steam pipe 14 Exhaust pipe 15 Ascites device 16 Vacuum break valve 17 Seal water temperature control valve 18 Bypass valve 19 Warming source valve 20 Water supply system 21 Motor 22 Water supply booster pump

Claims (2)

蒸気駆動給水ポンプを給水系統から遮断する蒸気駆動給水ポンプのアイソレートシステムであって、前記蒸気駆動給水ポンプを駆動する蒸気タービンを停止させてターニング運転に移行するターニング運転移行手段と、前記蒸気タービンの真空破壊を行う真空破壊手段と、前記蒸気タービン及び蒸気駆動給水ポンプを冷却する冷却手段と、前記蒸気タービンのターニング運転を停止するターニング運転停止手段と、前記蒸気駆動給水ポンプを給水系統から遮断して内部の水を排出するアイソレート手段とからなる蒸気駆動給水ポンプのアイソレートシステム。   An isolation system for a steam-driven feed water pump that shuts off the steam-driven feed water pump from the feed water system, the turning operation transition means for stopping the steam turbine that drives the steam-driven feed water pump and shifting to a turning operation, and the steam turbine A vacuum breaking means for performing a vacuum break, a cooling means for cooling the steam turbine and the steam-driven feed water pump, a turning operation stop means for stopping the turning operation of the steam turbine, and the steam-driven feed pump being shut off from the water supply system An isolation system for a steam-driven feed water pump comprising an isolation means for discharging the internal water. 前記冷却手段が、前記蒸気タービン及び蒸気駆動給水ポンプの温度が所定温度以下になるまで冷却するようにした請求項に記載の蒸気駆動給水ポンプのアイソレートシステム。 2. The steam-driven feed water pump isolation system according to claim 1 , wherein the cooling means cools the steam turbine and the steam-driven feed water pump until a temperature of the steam turbine and the steam-driven feed pump becomes equal to or lower than a predetermined temperature.
JP2005291854A 2005-10-05 2005-10-05 Method and system for isolating a steam driven feed pump Expired - Fee Related JP4926441B2 (en)

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JP5361079B2 (en) * 2010-12-29 2013-12-04 中国電力株式会社 Method for cooling hydrogen cooling device
JP5766504B2 (en) * 2011-05-16 2015-08-19 三菱日立パワーシステムズ株式会社 Rotor deformation prevention method and rotor deformation prevention device
JP5188607B2 (en) * 2011-06-29 2013-04-24 中国電力株式会社 Isolation method for maintenance in power generation facilities
JP5461507B2 (en) * 2011-11-21 2014-04-02 中国電力株式会社 How to stop power generation equipment
CN102563612A (en) * 2012-01-30 2012-07-11 浙江省电力设计院 Method for directly starting steam-driven feed water pump of large-sized thermal power plant
JP5450850B1 (en) * 2013-01-31 2014-03-26 中国電力株式会社 BFP turbine isolation method
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5759007A (en) * 1980-09-26 1982-04-09 Hitachi Ltd Turning apparatus
JPS5828907A (en) * 1981-08-17 1983-02-21 株式会社東芝 Controller for turning of turbine for driving boiler feed pump
JPS6267203A (en) * 1985-09-20 1987-03-26 Hitachi Ltd Turbine for driving boiler feed pump

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