JP4719526B2 - Feed water heater drain tank system - Google Patents

Feed water heater drain tank system Download PDF

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JP4719526B2
JP4719526B2 JP2005225128A JP2005225128A JP4719526B2 JP 4719526 B2 JP4719526 B2 JP 4719526B2 JP 2005225128 A JP2005225128 A JP 2005225128A JP 2005225128 A JP2005225128 A JP 2005225128A JP 4719526 B2 JP4719526 B2 JP 4719526B2
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water
heaters
water supply
steam
drain tank
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JP2007040603A (en
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晴彦 池田
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Hitachi Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin

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Description

本発明は、ボイラあるいは発電用原子炉の給水加熱器ドレンタンクシステムに係り、特に、蒸気を加熱源とする複数の給水加熱器が共通のドレンタンクに接続された給水加熱器ドレンタンクシステムに関する。   The present invention relates to a feed water heater drain tank system for a boiler or a power generation reactor, and more particularly to a feed water heater drain tank system in which a plurality of feed water heaters using steam as a heating source are connected to a common drain tank.

非特許文献１では、タービンへのウォーターインダクションを防ぐための対策を冗長的に講じるよう推奨しており、その具体的な推奨案の一つとして、給水加熱器にタービンの抽気を加熱源として供給する抽気蒸気管に自動止め弁を設置することが記載されている。但し、当該止め弁の設置目的は、給水加熱器からタービンへ水が流入するのを防止することであり、給水加熱器への給水をカットした際に不要となる、タービンから給水加熱器への蒸気の遮断を目的としたものではない。   In Non-Patent Document 1, it is recommended to take redundant measures to prevent water induction into the turbine. As one of the specific recommendations, supply of the extracted water from the turbine to the feed water heater as a heating source is recommended. It is described that an automatic stop valve is installed in the extraction steam pipe. However, the purpose of installing the stop valve is to prevent water from flowing into the turbine from the feed water heater, and is unnecessary when the feed water to the feed water heater is cut. It is not intended to block steam.

ＡＳＭＥ ＴＷＤＰＳ−１（１９７３年度版）第３頁 Recommended Practices for the Prevention of Water damage to Steam Turbines Used for Electric Power GenerationASME TWDPS-1 (1973 version) 3rd page Recommended Practices for the Prevention of Water damage to Steam Turbines Used for Electric Power Generation

蒸気を加熱源とする給水加熱器が複数基設けられている場合、各給水加熱器で蒸気の凝縮により生成される凝縮水（ドレン）は、通常、共通のドレンタンクに集められる。つまり、各給水加熱器の加熱蒸気流路は、ドレンタンクを介してつながっている。したがって、複数の給水加熱器のうちの一つ（例えば給水加熱器Ａ）への給水が停止された場合、その給水加熱器Ａに不要な加熱蒸気が流れ込み、この蒸気がドレンタンクを介して給水が継続されている給水加熱器Ｂへ逆流する恐れがある。   When a plurality of feed water heaters using steam as a heating source are provided, condensed water (drain) generated by condensation of steam in each feed water heater is usually collected in a common drain tank. That is, the heating steam flow path of each feed water heater is connected via the drain tank. Therefore, when the water supply to one of the plurality of water heaters (for example, the water heater A) is stopped, unnecessary heating steam flows into the water heater A, and this steam is supplied through the drain tank. May flow back to the feed water heater B.

このような事象が生じると、給水加熱器Ｂからドレンタンクへのドレン流れが阻害され、ドレンタンク内の水位が不安定となる恐れがある。   When such an event occurs, the drain flow from the feed water heater B to the drain tank is hindered, and the water level in the drain tank may become unstable.

本発明の課題は、複数設けられている給水加熱器のうちの一つへの給水が停止された場合に、給水が停止された給水加熱器に流れ込む蒸気が、ドレンタンクを介して給水が継続されている給水加熱器へ逆流するのを防止することである。 The problem of the present invention is that when water supply to one of a plurality of water heaters is stopped, the steam flowing into the water heater whose water supply has been stopped continues to be supplied via the drain tank. It is to prevent backflow to the feed water heater .

上記課題は、個別に接続された蒸気管で供給される蒸気を熱源とする複数の給水加熱器と、この複数の給水加熱器に、重力流下方式のドレン配管で共通に接続されたドレンタンクと、前記複数の給水加熱器それぞれに接続された給水管と、前記給水管に介装された給水弁と、いいずれかの給水加熱器への給水が停止された場合に、該給水が停止した給水加熱器につながる前記蒸気管に流入した蒸気が前記ドレンタンクを経て、給水が継続されている他の給水加熱器に流入するのを防ぐ遮断手段とを備えてなる給水加熱器ドレンタンクシステムにより、解決される。 The above-mentioned problems include a plurality of feed water heaters that use steam supplied through individually connected steam pipes as a heat source, and a drain tank commonly connected to the plurality of feed water heaters through a gravity flow drain pipe. The water supply is stopped when the water supply pipe connected to each of the plurality of water supply heaters, the water supply valve interposed in the water supply pipe, or any one of the water supply heaters is stopped. By means of a feed water heater drain tank system comprising a shut-off means for preventing steam flowing into the steam pipe connected to the feed water heater from flowing into the other feed water heater where the feed water is continued through the drain tank. Solved.

このような遮断手段を設けることにより、給水が停止された給水加熱器につながる蒸気管に流入した蒸気が前記ドレンタンクを経て他の給水が継続されている給水加熱器に流入するのが防止され、給水が継続されている給水加熱器からドレンタンクへのドレン流れが阻害されたり、ドレンタンク内の水位が不安定になったりするのが避けられる。   By providing such a blocking means, it is possible to prevent the steam that has flowed into the steam pipe connected to the feed water heater from which feed water has been stopped from flowing into the feed water heater through which the other feed water continues through the drain tank. The drain flow from the water heater to which the water supply is continued to the drain tank is obstructed and the water level in the drain tank is prevented from becoming unstable.

前記遮断手段は、前記蒸気管それぞれに介装された止め弁で形成し、この止め弁を前記給水弁の閉動作に連動して閉じられるものとしてもよいし、前記蒸気管それぞれに介装された逆止弁で形成し、この逆止弁を、前記給水弁の閉動作に連動して強制的に閉じられるものとしてもよい。   The shut-off means may be formed by a stop valve interposed in each of the steam pipes, and the stop valve may be closed in conjunction with the closing operation of the water supply valve, or may be interposed in each of the steam pipes. Alternatively, the check valve may be forcibly closed in conjunction with the closing operation of the water supply valve.

前記遮断手段はまた、前記ドレン配管それぞれにＵシールを形成して構成してもよいし、前記ドレン配管それぞれに介装された逆止弁で構成してもよい。前記ドレン配管の下流端をドレンタンクの水面下になる位置に接続し、前記ドレン配管のドレンタンクの水面下になる部分で前記遮断手段を構成してもよい。   The shut-off means may also be configured by forming a U seal on each drain pipe or a check valve interposed in each drain pipe. The downstream end of the drain pipe may be connected to a position below the water surface of the drain tank, and the blocking means may be configured at a portion of the drain pipe below the water surface of the drain tank.

以上説明したように、本発明によれば、給水が継続されている給水加熱器へ蒸気が逆流するのを防止することができ、ドレンタンクへのドレン流れが阻害されてドレンタンク内の水位が不安定となるのを防ぐことができる。   As described above, according to the present invention, it is possible to prevent the steam from flowing back to the feed water heater in which the water supply is continued, the drain flow to the drain tank is inhibited, and the water level in the drain tank is reduced. It can be prevented from becoming unstable.

＜実施の形態１＞
以下、本発明の実施の形態１を、図面を参照して説明する。図１は、本発明の実施の形態１に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。図示の給水加熱器ドレンタンクシステムは、蒸気管１，２にそれぞれ分岐して接続された蒸気管３，４と、蒸気管３，４の下流端にそれぞれ加熱蒸気入口を接続して設けられた給水加熱器５，６と、給水加熱器５，６のドレン出側にそれぞれ上流端を接続されたドレン配管７，８と、ドレン配管７，８の下流端が気相部に接続されて設けられたドレンタンク９と、ドレンタンク９の底部外面に接続されたドレンタンクドレン管１０と、蒸気管３に上流側から順に介装された逆止弁１３、止め弁１５と、蒸気管４に上流側から順に介装された逆止弁１４、止め弁１６と、給水加熱器５，６それぞれの給水入口に接続された給水管２５，２６と、給水管２５，２６にそれぞれ介装された給水弁１９，２０と、給水加熱器５，６それぞれの加熱蒸気流路最高部とドレンタンク９の気相部を接続するベント管１１，１２と、を含んで構成されている。 <Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing a schematic configuration of a feed water heater drain tank system according to Embodiment 1 of the present invention. The illustrated feed water heater drain tank system is provided with steam pipes 3 and 4 branched and connected to the steam pipes 1 and 2, respectively, and a heating steam inlet connected to the downstream ends of the steam pipes 3 and 4, respectively. Provided with feed water heaters 5 and 6, drain pipes 7 and 8 having their upstream ends connected to the drain outlet side of feed water heaters 5 and 6, and downstream ends of drain pipes 7 and 8 connected to the gas phase section The drain tank 9, the drain tank drain pipe 10 connected to the bottom outer surface of the drain tank 9, the check valve 13, the stop valve 15, and the steam pipe 4, which are interposed in order from the upstream side of the steam pipe 3. The check valve 14 and the stop valve 16 that are interposed in order from the upstream side, the water supply pipes 25 and 26 connected to the water supply inlets of the water heaters 5 and 6, and the water supply pipes 25 and 26, respectively. Heating steam of water supply valves 19 and 20 and water heaters 5 and 6 respectively A vent tube 11 which connects the gas phase portion of the road-up portion and the drain tank 9 is configured to include a.

給水管２５，２６から給水加熱器５，６それぞれに給水が供給され、蒸気管１、２から給水加熱器５、６へ、蒸気管３、４を介して蒸気が供給されて、各給水加熱器にて給水が加熱される。蒸気管１，２は図示されていない蒸気タービンに接続されており、蒸気管３，４には、蒸気管１，２の圧力が急激に減少した場合にタービンへの蒸気逆流を防止するため、逆止弁１３、１４が設置されている。また、ドレン配管７，８及びドレンタンクドレン管１０は、いずれも水平あるいは下流側が低くなる傾斜で配管されている。   Feed water is supplied to the feed water heaters 5 and 6 from the feed water pipes 25 and 26, and steam is supplied from the steam pipes 1 and 2 to the feed water heaters 5 and 6 through the steam pipes 3 and 4, respectively. The water supply is heated in the vessel. The steam pipes 1 and 2 are connected to a steam turbine (not shown), and the steam pipes 3 and 4 prevent the steam from flowing back to the turbine when the pressure of the steam pipes 1 and 2 decreases rapidly. Check valves 13 and 14 are installed. Further, the drain pipes 7 and 8 and the drain tank drain pipe 10 are all piped with an inclination that becomes lower in the horizontal or downstream side.

給水加熱器５，６の加熱蒸気流路内で生成されたドレンは、グラビティー流れでドレン配管７，８を通り、ドレンタンク９へ流れる。ドレンタンク９に集められたドレンは、ドレンタンクドレン管１０を通って排出される。給水加熱器５，６への給水は、給水弁１９、２０を閉止することにより供給停止することができる。   The drain generated in the heating steam flow path of the feed water heaters 5 and 6 flows into the drain tank 9 through the drain pipes 7 and 8 in a gravity flow. The drain collected in the drain tank 9 is discharged through the drain tank drain pipe 10. Water supply to the water heaters 5 and 6 can be stopped by closing the water supply valves 19 and 20.

上記構成において、給水弁２０を閉止することで給水加熱器６への給水が停止された場合、止め弁１６が閉止されて不要となる蒸気管２からの蒸気が遮断される。給水弁１９、２０は、閉止されたとき、それぞれ閉信号を図示されていない制御装置に出力するように構成され、止め弁１５、１６は、前記図示されていない制御装置からの閉信号で遠隔操作されて閉止される。制御装置は、給水弁１９あるいは給水弁２０からの閉信号を受信したとき、止め弁１５あるいは止め弁１６に対して閉信号を出力する。   In the above configuration, when water supply to the feed water heater 6 is stopped by closing the water supply valve 20, the stop valve 16 is closed and unnecessary steam from the steam pipe 2 is shut off. When the water supply valves 19 and 20 are closed, they are each configured to output a close signal to a control device (not shown), and the stop valves 15 and 16 are remotely controlled by a close signal from the control device (not shown). Operated and closed. When receiving the close signal from the water supply valve 19 or the water supply valve 20, the control device outputs a close signal to the stop valve 15 or the stop valve 16.

本実施の形態によれば、給水弁２０の閉止により給水加熱器６への給水が停止されても、止め弁１６が閉止されるので蒸気管２からの蒸気が遮断され、給水加熱器６を通過した蒸気がドレン配管８、ドレンタンク９の気相部を経てドレン配管７に流入することがなくなり、給水加熱器５からドレンタンク９へのドレンの流入を阻害する恐れがなく、ドレンタンク９の水位が不安定になる恐れもなくなる。   According to the present embodiment, even if water supply to the feed water heater 6 is stopped by closing the feed water valve 20, the stop valve 16 is closed, so that the steam from the steam pipe 2 is shut off, and the feed water heater 6 is turned off. The passed steam does not flow into the drain pipe 7 via the drain pipe 8 and the gas phase part of the drain tank 9, and there is no possibility of inhibiting the inflow of drain from the feed water heater 5 to the drain tank 9. There is no risk of the water level becoming unstable.

＜実施の形態２＞
本発明の実施の形態２に係る給水加熱器ドレンタンクシステムを、図２を参照して説明する。図２は、本発明の実施の形態２に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。本実施の形態が前記実施の形態１と異なるのは、蒸気管３，４には止め弁が介装されておらず、逆止弁１３、１４に代えて強制閉機能付逆止弁２３、２４が設けられている点である。他の構成は同じなので、同一の符号を付して説明を省略する。強制閉機能付逆止弁２３、２４は、制御装置から出力される閉信号により、強制閉止されるようになっている。 <Embodiment 2>
A feed water heater drain tank system according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 is a system diagram showing a schematic configuration of a feed water heater drain tank system according to Embodiment 2 of the present invention. The present embodiment is different from the first embodiment in that no stop valve is interposed in the steam pipes 3 and 4, and the check valve 23 with a forced closing function is used instead of the check valves 13 and 14. 24 is provided. Since other configurations are the same, the same reference numerals are given and description thereof is omitted. The check valves 23 and 24 with a forced closing function are forcibly closed by a close signal output from the control device.

本実施の形態において、給水加熱器６へ供給される給水が給水弁２０の閉止により停止された場合、強制閉機能付逆止弁２４が強制閉止され、不要となる蒸気管２からの蒸気が遮断される。 本実施の形態においても、実施の形態１と同様に、給水加熱器６を通過した蒸気がドレン配管８、ドレンタンク９の気相部を経てドレン配管７に流入することがなくなり、給水加熱器５からドレンタンク９へのドレンの流入を阻害する恐れがなく、ドレンタンク９の水位が不安定になる恐れもなくなる。   In the present embodiment, when the feed water supplied to the feed water heater 6 is stopped by closing the feed water valve 20, the check valve 24 with the forced close function is forcibly closed, and unnecessary steam from the steam pipe 2 is generated. Blocked. Also in the present embodiment, similarly to the first embodiment, the steam that has passed through the feed water heater 6 does not flow into the drain pipe 7 via the drain pipe 8 and the gas phase part of the drain tank 9, and the feed water heater Therefore, there is no possibility that the inflow of the drain from 5 to the drain tank 9 is obstructed, and there is no possibility that the water level of the drain tank 9 becomes unstable.

＜実施の形態３＞
本発明の実施の形態３に係る給水加熱器ドレンタンクシステムを、図３を参照して説明する。図３は、本発明の実施の形態３に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。本実施の形態が前記実施の形態１と異なるのは、蒸気管３，４には止め弁が介装されておらず、給水加熱器５、６とドレンタンク９を接続するドレン配管７，８にＵシール１７、１８が形成されている点である。他の構成は同じなので、同一の符号を付して説明を省略する。 <Embodiment 3>
A feed water heater drain tank system according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 3 is a system diagram showing a schematic configuration of a feed water heater drain tank system according to Embodiment 3 of the present invention. The present embodiment is different from the first embodiment in that no stop valve is interposed in the steam pipes 3 and 4, and the drain pipes 7 and 8 that connect the feed water heaters 5 and 6 and the drain tank 9. The U seals 17 and 18 are formed on the surface. Since other configurations are the same, the same reference numerals are given and description thereof is omitted.

本実施の形態ではＵシール１７、１８の高さは５ｍとしてある。この場合、Ｕシール１７、１８に要求される高さは、流入する蒸気の圧力で決まるのではなく、蒸気源から給水加熱器までの圧力損失の大きさで決まるが、蒸気源から給水加熱器までの設計圧力損失は、発電用蒸気タービンプラントの場合、火力、原子力ともに大きな差はない。   In the present embodiment, the height of the U seals 17 and 18 is 5 m. In this case, the height required for the U seals 17 and 18 is not determined by the pressure of the incoming steam, but is determined by the magnitude of the pressure loss from the steam source to the feed water heater. In the case of a steam turbine plant for power generation, there is no significant difference in the design pressure loss for both thermal power and nuclear power.

本実施の形態においても、給水加熱器６へ供給される給水が給水弁２０の閉止により停止された場合、Ｕシール１７、１８によりドレンタンク９から給水加熱器５への蒸気逆流を防止することができ、給水加熱器５からドレンタンク９へのドレンの流入を阻害する恐れがなく、ドレンタンク９の水位が不安定になる恐れもなくなる。   Also in the present embodiment, when the feed water supplied to the feed water heater 6 is stopped by closing the feed water valve 20, the U seals 17 and 18 prevent back flow of steam from the drain tank 9 to the feed water heater 5. Therefore, there is no possibility of hindering the inflow of drain from the feed water heater 5 to the drain tank 9, and there is no possibility that the water level of the drain tank 9 becomes unstable.

＜実施の形態４＞
本発明の実施の形態４に係る給水加熱器ドレンタンクシステムを、図４を参照して説明する。図４は、本発明の実施の形態４に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。本実施の形態が前記実施の形態１と異なるのは、蒸気管３，４には止め弁が介装されておらず、給水加熱器５、６とドレンタンク９を接続するドレン配管７，８の下流端が、ドレンタンクの水面下になる位置に接続されている点である。他の構成は同じなので、同一の符号を付して説明を省略する。 <Embodiment 4>
A feed water heater drain tank system according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 4 is a system diagram showing a schematic configuration of a feed water heater drain tank system according to Embodiment 4 of the present invention. The present embodiment is different from the first embodiment in that no stop valve is interposed in the steam pipes 3 and 4, and the drain pipes 7 and 8 that connect the feed water heaters 5 and 6 and the drain tank 9. The downstream end is connected to a position below the water surface of the drain tank. Since other configurations are the same, the same reference numerals are given and description thereof is omitted.

本実施の形態においても、給水加熱器６へ供給される給水が給水弁２０の閉止により停止された場合、ドレンタンク９から給水加熱器５への蒸気逆流を防止することができ、給水加熱器５からドレンタンク９へのドレンの流入を阻害する恐れがなく、ドレンタンク９の水位が不安定になる恐れもなくなる。   Also in the present embodiment, when the feed water supplied to the feed water heater 6 is stopped by closing the feed water valve 20, the backflow of steam from the drain tank 9 to the feed water heater 5 can be prevented, and the feed water heater Therefore, there is no possibility that the inflow of the drain from 5 to the drain tank 9 is obstructed, and there is no possibility that the water level of the drain tank 9 becomes unstable.

＜実施の形態５＞
本発明の実施の形態５に係る給水加熱器ドレンタンクシステムを、図５を参照して説明する。図５は、本発明の実施の形態５に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。本実施の形態が前記実施の形態１と異なるのは、蒸気管３，４には止め弁が介装されておらず、ドレン配管７，８に、ドレン逆止弁２１、２２が介装されている点である。他の構成は同じなので、同一の符号を付して説明を省略する。なお、ドレン逆止弁の代わりに止め弁を採用することも可能である。 <Embodiment 5>
A feed water heater drain tank system according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 5 is a system diagram showing a schematic configuration of a feed water heater drain tank system according to Embodiment 5 of the present invention. This embodiment is different from the first embodiment in that no stop valve is interposed in the steam pipes 3 and 4, and drain check valves 21 and 22 are interposed in the drain pipes 7 and 8. It is a point. Since other configurations are the same, the same reference numerals are given and description thereof is omitted. It is also possible to employ a stop valve instead of the drain check valve.

本実施の形態においても、給水加熱器６へ供給される給水が給水弁２０の閉止により停止された場合、ドレンタンク９から給水加熱器５への蒸気逆流を防止することができ、給水加熱器５からドレンタンク９へのドレンの流入を阻害する恐れがなく、ドレンタンク９の水位が不安定になる恐れもなくなる。   Also in the present embodiment, when the feed water supplied to the feed water heater 6 is stopped by closing the feed water valve 20, the backflow of steam from the drain tank 9 to the feed water heater 5 can be prevented, and the feed water heater Therefore, there is no possibility that the inflow of the drain from 5 to the drain tank 9 is obstructed, and there is no possibility that the water level of the drain tank 9 becomes unstable.

本発明の実施の形態１に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。It is a systematic diagram which shows schematic structure of the feed water heater drain tank system which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。It is a systematic diagram which shows schematic structure of the feed water heater drain tank system which concerns on Embodiment 2 of this invention. 本発明の実施の形態３に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。It is a systematic diagram which shows schematic structure of the feed water heater drain tank system which concerns on Embodiment 3 of this invention. 本発明の実施の形態４に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。It is a systematic diagram which shows schematic structure of the feed water heater drain tank system which concerns on Embodiment 4 of this invention. 本発明の実施の形態５に係る給水加熱器ドレンタンクシステムの概略構成を示す系統図である。It is a systematic diagram which shows schematic structure of the feed water heater drain tank system which concerns on Embodiment 5 of this invention.

符号の説明Explanation of symbols

１，２，３，４ 蒸気管
５，６ 給水加熱器
７，８ ドレン配管
９ ドレンタンク
１０ ドレンタンクドレン管
１１，１２ ベント管
１３，１４ 逆止弁
１５，１６ 止め弁
１７，１８ Ｕシール
１９，２０ 給水弁
２１，２２ ドレン逆止弁
２３，２４ 強制閉機能付逆止弁 1, 2, 3, 4 Steam pipes 5, 6 Feed water heater 7, 8 Drain pipe 9 Drain tank 10 Drain tank drain pipe 11, 12 Vent pipe 13, 14 Check valve 15, 16 Stop valve 17, 18 U seal 19 , 20 Water supply valve 21, 22 Drain check valve 23, 24 Check valve with forced close function

Claims (5)

個別に接続された蒸気管で供給される蒸気を熱源とする複数の給水加熱器と、この複数の給水加熱器に、重力流下方式のドレン配管で共通に接続されたドレンタンクと、前記複数の給水加熱器それぞれに接続された給水管と、前記給水管に介装された給水弁とを備え、
いずれかの給水加熱器への給水が停止された場合に、該給水が停止した給水加熱器につながる前記蒸気管に流入した蒸気が前記ドレンタンクを経て、給水が継続されている他の給水加熱器に流入するのを防ぐ手段として、前記蒸気管それぞれに止め弁を介装し、該止め弁を前記給水弁の閉動作に連動して閉じるように構成してなる給水加熱器ドレンタンクシステム。 A plurality of feed water heaters using steam supplied through individually connected steam pipes as a heat source, a drain tank commonly connected to the plurality of feed water heaters by a drain pipe of a gravity flow method, and the plurality of feed water heaters comprising a water supply pipe connected to the respective feed water heater, and a water supply valve interposed in the water supply pipe,
When the water supply to any of the water heaters is stopped, the steam that has flowed into the steam pipe connected to the water heater heated to stop the water supply passes through the drain tank, and the other water supply heaters that continue to supply water A feed water heater drain tank system comprising a stop valve in each of the steam pipes as means for preventing the water from flowing into the heater, and the stop valve is closed in conjunction with the closing operation of the feed water valve . 個別に接続された蒸気管で供給される蒸気を熱源とする複数の給水加熱器と、この複数の給水加熱器に、重力流下方式のドレン配管で共通に接続されたドレンタンクと、前記複数の給水加熱器それぞれに接続された給水管と、前記給水管に介装された給水弁とを備え、
いずれかの給水加熱器への給水が停止された場合に、該給水が停止した給水加熱器につながる前記蒸気管に流入した蒸気が前記ドレンタンクを経て、給水が継続されている他の給水加熱器に流入するのを防ぐ手段として、前記蒸気管それぞれに逆止弁を介装し、該逆止弁を前記給水弁の閉動作に連動して強制的に閉じられる強制閉止機能付きもので構成してなる給水加熱器ドレンタンクシステム。 A plurality of feed water heaters using steam supplied through individually connected steam pipes as a heat source, a drain tank commonly connected to the plurality of feed water heaters by a drain pipe of a gravity flow method, and the plurality of feed water heaters A water supply pipe connected to each of the water supply heaters, and a water supply valve interposed in the water supply pipe,
When the water supply to any of the water heaters is stopped, the steam that has flowed into the steam pipe connected to the water heater heated to stop the water supply passes through the drain tank, and the other water supply heaters that continue to supply water as means for preventing the flow into the vessel, a check valve is interposed to each of the steam pipe, constituted by a forced closing function inherent to force closed in conjunction with check valve to closing of the water supply valve A feed water heater drain tank system. 個別に接続された蒸気管で供給される蒸気を熱源とする複数の給水加熱器と、この複数の給水加熱器に、重力流下方式のドレン配管で共通に接続されたドレンタンクと、前記複数の給水加熱器それぞれに接続された給水管と、前記給水管に介装された給水弁とを備え、
いずれかの給水加熱器への給水が停止された場合に、該給水が停止した給水加熱器につながる前記蒸気管に流入した蒸気が前記ドレンタンクを経て、給水が継続されている他の給水加熱器に流入するのを防ぐ手段として、前記ドレン配管それぞれにＵシールを形成し、該Ｕシールの高さは、前記給水加熱器の熱源である蒸気源から当該給水加熱器までの圧力損失の大きさに応じて決められてなる給水加熱器ドレンタンクシステム。 A plurality of feed water heaters using steam supplied through individually connected steam pipes as a heat source, a drain tank commonly connected to the plurality of feed water heaters by a drain pipe of a gravity flow method, and the plurality of feed water heaters A water supply pipe connected to each of the water supply heaters, and a water supply valve interposed in the water supply pipe,
When the water supply to any of the water heaters is stopped, the steam that has flowed into the steam pipe connected to the water heater heated to stop the water supply passes through the drain tank, and the other water supply heaters that continue to supply water As a means for preventing inflow into the water heater, a U- seal is formed in each drain pipe , and the height of the U-seal is large in pressure loss from the steam source that is a heat source of the water heater to the water heater. A feed water heater drain tank system determined according to the size. 個別に接続された蒸気管で供給される蒸気を熱源とする複数の給水加熱器と、この複数の給水加熱器に、重力流下方式のドレン配管で共通に接続されたドレンタンクと、前記複数の給水加熱器それぞれに接続された給水管と、前記給水管に介装された給水弁とを備え、
いずれかの給水加熱器への給水が停止された場合に、該給水が停止した給水加熱器につながる前記蒸気管に流入した蒸気が前記ドレンタンクを経て、給水が継続されている他の給水加熱器に流入するのを防ぐ手段として、前記ドレン配管それぞれに逆止弁を介装してなる給水加熱器ドレンタンクシステム。 A plurality of feed water heaters using steam supplied through individually connected steam pipes as a heat source, a drain tank commonly connected to the plurality of feed water heaters by a drain pipe of a gravity flow method, and the plurality of feed water heaters A water supply pipe connected to each of the water supply heaters, and a water supply valve interposed in the water supply pipe,
When the water supply to any of the water heaters is stopped, the steam that has flowed into the steam pipe connected to the water heater heated to stop the water supply passes through the drain tank, and the other water supply heaters that continue to supply water A feed water heater drain tank system in which a check valve is interposed in each of the drain pipes as means for preventing inflow into the heater. 個別に接続された蒸気管で供給される蒸気を熱源とする複数の給水加熱器と、この複数の給水加熱器に、重力流下方式のドレン配管で共通に接続されたドレンタンクと、前記複数の給水加熱器それぞれに接続された給水管と、前記給水管に介装された給水弁とを備え、
いずれかの給水加熱器への給水が停止された場合に、該給水が停止した給水加熱器につながる前記蒸気管に流入した蒸気が前記ドレンタンクを経て、給水が継続されている他の給水加熱器に流入するのを防ぐ手段として、前記ドレン配管の下流端を前記ドレンタンクの水面下に接続してなる給水加熱器ドレンタンクシステム。 A plurality of feed water heaters using steam supplied through individually connected steam pipes as a heat source, a drain tank commonly connected to the plurality of feed water heaters by a drain pipe of a gravity flow method, and the plurality of feed water heaters A water supply pipe connected to each of the water supply heaters, and a water supply valve interposed in the water supply pipe,
When the water supply to any of the water heaters is stopped, the steam that has flowed into the steam pipe connected to the water heater heated to stop the water supply passes through the drain tank, and the other water supply heaters that continue to supply water A feed water heater drain tank system in which the downstream end of the drain pipe is connected below the water surface of the drain tank as a means for preventing inflow into the water tank.
JP2005225128A 2005-08-03 2005-08-03 Feed water heater drain tank system Expired - Fee Related JP4719526B2 (en)

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JPS56149205U (en) * 1980-04-10 1981-11-10
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JPS61140704A (en) * 1984-12-12 1986-06-27 株式会社東芝 Feedwater heater for turbine
JPH01185493A (en) * 1988-01-20 1989-07-25 Hitachi Ltd Boiling water type nuclear power plant
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JPS56149205A (en) * 1980-04-22 1981-11-19 Nissan Motor Co Ltd Regenerative heating device

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JPS56149205U (en) * 1980-04-10 1981-11-10
JPS5977204A (en) * 1982-10-27 1984-05-02 株式会社日立製作所 High-pressure feedwater heater device
JPS61140704A (en) * 1984-12-12 1986-06-27 株式会社東芝 Feedwater heater for turbine
JPH01185493A (en) * 1988-01-20 1989-07-25 Hitachi Ltd Boiling water type nuclear power plant
JP2001324594A (en) * 2000-05-12 2001-11-22 Toshiba Corp Nuclear turbine system

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