JP2009127952A - Drain control device of low pressure water supply heater and steam turbine plant - Google Patents

Drain control device of low pressure water supply heater and steam turbine plant Download PDF

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Publication number
JP2009127952A
JP2009127952A JP2007304512A JP2007304512A JP2009127952A JP 2009127952 A JP2009127952 A JP 2009127952A JP 2007304512 A JP2007304512 A JP 2007304512A JP 2007304512 A JP2007304512 A JP 2007304512A JP 2009127952 A JP2009127952 A JP 2009127952A
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drain
water heater
feed water
water level
low
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Naoki Yasuda
直樹 安田
Hideki Fujishima
英樹 藤島
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Toshiba Corp
Toshiba Plant Systems and Services Corp
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Toshiba Corp
Toshiba Plant Systems and Services Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain control device of a low pressure water supply heater, recovering drain in simple constitution by utilizing an internal pressure difference between a water supply heater and a condenser without a flow control valve and a drain cooler in a drain discharge pipe communicating the water supply heater with the condenser. <P>SOLUTION: In a drain water level control device configured to discharge drain of the low pressure water supply heater 1 to the condenser 3 by the drain discharge pipe 2, the low pressure water supply heater 1 and the bottom of the condenser 3 are communicated with each other by the drain discharge pipe 2 having a head difference above the differential pressure between the internal pressure of the low pressure water supply heater 1 and the internal pressure of the condenser 3 and a U-sealing function. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、火力または原子力発電プラント設備における低圧給水加熱器のドレン水位制御装置および蒸気タービンプラントに関するものである。   The present invention relates to a drain water level control device for a low-pressure feed water heater and a steam turbine plant in thermal power or nuclear power plant equipment.

通常、火力または原子力発電プラントにおいては、給水ポンプよりも復水器側の給水系に低圧給水加熱器を、給水ポンプよりもボイラ側の給水系に高圧給水加熱器をそれぞれ設置することによって、タービンプラントの熱効率向上を図っている（例えば、非特許文献１参照）。   Normally, in a thermal power or nuclear power plant, a low-pressure feed water heater is installed in the feed water system on the condenser side of the feed water pump, and a high-pressure feed water heater is installed in the feed water system on the boiler side of the feed water pump. Improvement of the thermal efficiency of a plant is aimed at (for example, refer nonpatent literature 1).

低圧給水加熱器では、低圧タービン抽気で復水を加熱した際に発生したドレンを一旦ドレンタンクに貯蔵し、このドレンタンクに貯蔵内したドレンをドレン排出管により復水器内に回収するように構成している。このため、給水加熱器と復水器との差圧を大きくとることができない。   In the low pressure feed water heater, the drain generated when the condensate is heated by the low pressure turbine bleed is temporarily stored in the drain tank, and the drain stored in the drain tank is collected in the condenser by the drain discharge pipe. It is composed. For this reason, the differential pressure | voltage of a feed water heater and a condenser cannot be taken large.

特に、低圧給水加熱器のうち、復水器に最も近い位置に設置されている低圧第１給水加熱器においては、復水器との差圧が微差圧となることから、ドレンタンク内のドレン水位を一定に調節するために設ける水位調節弁のサイズは非常に大口径となり、配管ルートの確保を困難にしている。   In particular, among the low-pressure feed water heaters, in the low-pressure first feed water heater installed at the position closest to the condenser, the pressure difference between the condenser and the condenser becomes a slight differential pressure. The size of the water level control valve provided for adjusting the drain water level is very large, making it difficult to secure the piping route.

図５は、火力または原子力発電プラント設備に設置された一般的な低圧給水加熱器のドレン水位制御に係わるプロセス系統図である。
図５において、図示しない低圧タービンからの抽気は、低圧第１給水加熱器１内に導入されて復水と熱交換した際にドレンとなる。このドレンは低圧第１給水加熱器１内の図示しないドレンタンクに一旦貯蔵され、ドレン排出管２内を流れて復水器３で回収されるようになっている。 FIG. 5 is a process system diagram relating to drain water level control of a general low-pressure feed water heater installed in thermal power or nuclear power plant equipment.
In FIG. 5, bleed air from a low-pressure turbine (not shown) becomes drain when it is introduced into the low-pressure first feed water heater 1 and exchanges heat with condensate. This drain is temporarily stored in a drain tank (not shown) in the low-pressure first feed water heater 1, flows in the drain discharge pipe 2, and is collected in the condenser 3.

ドレン排出管２には途中に水位調節弁４が設けられている。この水位調節弁４はドレンタンクの水位を一定に調節するために設けられた弁であり、低圧第１給水加熱器１内のドレンタンクに設置されている水位検出器５からの動作信号によって弁開度を制御されるようになっている。   The drain discharge pipe 2 is provided with a water level adjustment valve 4 on the way. The water level control valve 4 is a valve provided to adjust the water level of the drain tank to a constant level, and is controlled by an operation signal from the water level detector 5 installed in the drain tank in the low pressure first feed water heater 1. The opening degree is controlled.

前述した低圧第１給水加熱器１内のドレン水位を一定に保つための水位調節弁４は、低圧第１給水加熱器１内のドレンタンクと復水器３との差圧を大きくとることができない分、サイズを大口径とせざるを得ない。例えばタービンの低負荷域においては、低圧第１給水加熱器１内のドレンタンクの圧力と復水器３器内圧力との差圧が約６０（ｋＰａ）のとき、約２８０（ｔ/ｈ）のドレンを流す必要があり、この条件下で配管を選定すると２５０Ａ(１０Ｂ)もの大きな口径の鋼管が必要となり、配管ルートの確保のみならず、配置計画、更には敷地計画から変更しなければならないという課題があった。ここで、２５０Ａ、１０Ｂはともに配管の呼び径を表す記号であり、Ａは外径をミリメートル表示する際、Ｂは外径をインチ表示する際に用いる記号である。因みに２５０Ａの場合、外径が２６７．４ｍｍである。   The water level control valve 4 for keeping the drain level in the low-pressure first feed water heater 1 constant can take a large differential pressure between the drain tank in the low-pressure first feed water heater 1 and the condenser 3. As much as possible, the size must be large. For example, in the low load region of the turbine, when the differential pressure between the pressure of the drain tank in the low pressure first feed water heater 1 and the pressure in the condenser 3 is about 60 (kPa), about 280 (t / h) If a pipe is selected under these conditions, a steel pipe with a large diameter of 250A (10B) is required, and it is necessary not only to secure a piping route but also to change the layout plan and site plan. There was a problem. Here, 250A and 10B are symbols representing the nominal diameter of the pipe, A is a symbol used when the outer diameter is displayed in millimeters, and B is a symbol used when displaying the outer diameter in inches. Incidentally, in the case of 250 A, the outer diameter is 267.4 mm.

上述した配管に係わる課題を解決するために、図６で示すように、低圧給水加熱器１のドレンタンク６と復水器３との間を連通するドレン排出管２の途中にドレン冷却器（ドレンクーリングゾーン）７を設け、しかもドレン排出管２のうち、ドレン冷却器７と復水器３間とを連通する配管部分をＵ字形配管８に形成するとともに、その先端部に水平接続管９を接続して復水器３内に開口させ、その開口部に対向離間してバッフル（図示せず）を配置した発明が開示されている（例えば、特許文献１参照）。   In order to solve the above-described problems related to the piping, as shown in FIG. 6, a drain cooler (in the middle of the drain discharge pipe 2 communicating between the drain tank 6 and the condenser 3 of the low-pressure feed water heater 1 is provided. A drain cooling zone) 7 is provided, and a portion of the drain discharge pipe 2 that communicates between the drain cooler 7 and the condenser 3 is formed in the U-shaped pipe 8, and a horizontal connection pipe 9 is provided at the tip thereof. Is connected to the condenser 3, and a baffle (not shown) is arranged opposite to and spaced from the opening (for example, see Patent Document 1).

この特許文献１によれば、ドレン排出管２には図５で設けた大口径の水位調節弁４を設ける必要がなく、安定したドレン排出機能を行わせることができるとされている。なお、特許文献１の技術でドレン冷却器７を設ける理由は、ドレン排出管２先端の水平接続管９が復水器３の上部胴に連通するように構成されているために、給水加熱器１で発生したドレンを飽和圧力温度以下に下げないと、復水器３の器内圧力が真空のためにドレンが蒸発して引き込まれ、その結果、蒸気流としての圧力損失が発生し、ドレン温度が高くなると蒸気流による閉塞現象によりタンク内水位が上昇して最悪の場合、ウォータインジェクションが発生する可能性があるからである。
特公平２−３６８４６号公報、ｐｐ．２〜３、図２、図４、図１０ 電気工学ハンドブック、昭和４３年４月発行、PP.１１６５、３８図。 According to this patent document 1, it is not necessary to provide the large-diameter water level control valve 4 provided in FIG. 5 in the drain discharge pipe 2, and a stable drain discharge function can be performed. The reason why the drain cooler 7 is provided in the technique of Patent Document 1 is that the horizontal connection pipe 9 at the tip of the drain discharge pipe 2 is configured to communicate with the upper body of the condenser 3, and thus the feed water heater If the drain generated in 1 is not lowered below the saturation pressure temperature, the internal pressure of the condenser 3 is vacuumed so that the drain evaporates and is drawn, resulting in a pressure loss as a steam flow. This is because when the temperature is high, the water level in the tank rises due to a clogging phenomenon caused by the steam flow, and in the worst case, water injection may occur.
Japanese Patent Publication No. 2-36846, pp. 2-3, FIG. 2, FIG. 4, FIG. Electrical Engineering Handbook, published in April 1968, PP. 1165, 38.

しかしながら、上記特許文献１に記載された技術は、ドレン排出管２に大口径の水位調節弁４を設ける必要がないという特徴を有する反面、低圧給水加熱器で発生したドレンの温度を飽和圧力温度以下まで下げるためにドレン排出管２の途中に新たにドレン冷却器７を設ける必要があり、その分設備費やメンテナンス費用が嵩むという欠点がある。   However, the technique described in Patent Document 1 is characterized in that it is not necessary to provide a large-diameter water level control valve 4 in the drain discharge pipe 2, but the temperature of the drain generated by the low-pressure feed water heater is set to the saturation pressure temperature. In order to lower it to below, it is necessary to newly provide the drain cooler 7 in the middle of the drain discharge pipe 2, and there is a disadvantage that the equipment cost and the maintenance cost increase accordingly.

本発明は上述した課題を解決するためになされたもので、低圧給水加熱器と復水器とを連通するドレン排出管内に、流量調節弁やドレン冷却器を設けずに、低圧給水加熱器と復水器の器内圧力差を利用することによって、簡潔な構成でドレンの回収することのできる低圧給水加熱器のドレン水位制御装置および蒸気タービンプラントを提供することを目的とするものである。   The present invention has been made to solve the above-described problems. In the drain discharge pipe that connects the low-pressure feed water heater and the condenser, a low-pressure feed water heater is provided without providing a flow control valve or a drain cooler. An object of the present invention is to provide a drain water level control device and a steam turbine plant of a low-pressure feed water heater that can recover drain with a simple configuration by utilizing the internal pressure difference of the condenser.

上記の目的を達成するために、請求項１に記載の発明は、低圧給水加熱器のドレンをドレン排水管によって復水器に排出するようにしたドレン水位制御装置において、前記低圧給水加熱器の器内圧力と、前記復水器の器内圧力との差圧以上のヘッド差を有し、Ｕシール機能を備えたドレン排水管により低圧給水加熱器と復水器底部とを連通させることを特徴とするものである。   In order to achieve the above object, the invention according to claim 1 is directed to a drain water level control apparatus in which drain of a low-pressure feed water heater is discharged to a condenser through a drain drain pipe. The pressure difference between the internal pressure of the condenser and the internal pressure of the condenser is greater than the differential pressure, and the low pressure feed water heater and the condenser bottom are communicated by a drain drain pipe having a U-seal function. It is a feature.

本発明によれば、低圧給水加熱器と復水器とを連通するドレン排出管の流路内に、流量調節弁やドレン冷却器を設けずに、低圧給水加熱器と復水器の器内圧力差を利用して、簡潔な構成でドレンの回収を行えるようにしたので、設備費を低減させることができるとともに、メンテナンスをする場合の費用も抑制することができる。   According to the present invention, the inside of the low-pressure feed water heater and the condenser is not provided in the flow path of the drain discharge pipe communicating with the low-pressure feed water heater and the condenser, without providing a flow rate adjusting valve or a drain cooler. Since the drain can be collected with a simple configuration using the pressure difference, the equipment cost can be reduced and the cost for maintenance can be suppressed.

以下、本発明の実施の形態について図面を参照して説明する。なお、各図を通じて共通する部品については、同一符号若しくは関連符号を付けることにより、重複した説明を適宜省くものとする。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the component which is common throughout each figure, the duplicate description shall be suitably omitted by attaching | subjecting the same code | symbol or a related code | symbol.

（第１の実施形態）
図１は、本発明の第１の実施形態に係る低圧給水加熱器のドレン水位制御を行うプロセス系統図である。 (First embodiment)
FIG. 1 is a process system diagram for performing drain water level control of the low-pressure feed water heater according to the first embodiment of the present invention.

図１において、１は低圧給水加熱器のうち、一番復水器に近い流路に設けられる低圧第１給水加熱器であって、復水器３の上部胴部に設置されて図示しない低圧タービンからの抽気を導入して復水された給水を加熱するものである。この低圧給水加熱器１内の熱交換チューブで給水と熱交換した抽気はドレンとなり、低圧給水加熱器１内の図示しないドレンタンクに一旦貯蔵され、ドレン排出管２を通って復水器３に導かれ回収されるようになっている。   In FIG. 1, reference numeral 1 denotes a low-pressure first feed water heater provided in a flow path closest to the condenser among low-pressure feed water heaters, which is installed in an upper trunk portion of the condenser 3 and is not shown in the figure. The extracted water from the turbine is introduced to heat the condensed feed water. The bleed air exchanged with the water supply by the heat exchange tube in the low-pressure feed water heater 1 becomes drain, is temporarily stored in a drain tank (not shown) in the low-pressure feed water heater 1, and passes through the drain discharge pipe 2 to the condenser 3. Guided and collected.

本実施形態における低圧給水加熱器のドレン水位制御装置は、例えば定格運転時における低圧第１給水加熱器１の器内圧力が約−３２（ｋＰａ）、復水器３の器内圧力が約−９２（ｋＰａ）である場合、低圧第１給水加熱器１の器内圧力と復水器３の器内圧力との差圧、すなわち、６０（ｋＰａ）以上のヘッド差が生じるような長さを有するドレン排出管２を用意し、その一端部２−１を低圧第１給水加熱器１器内の図示しないドレンタンクの下部に連通させ、中間部２−３をＵ字形に撓ませた状態で他端部２−２をドレン水Ｄに水没するように復水器３の底部に連通させるように構成したものである。 The drain water level control device for the low-pressure feed water heater in the present embodiment has, for example, an internal pressure of the low-pressure first feed water heater 1 of about −32 (kPa) and an internal pressure of the condenser 3 of about −− during rated operation. When the pressure is 92 (kPa), the pressure difference between the internal pressure of the low-pressure first feed water heater 1 and the internal pressure of the condenser 3, that is, a length that causes a head difference of 60 (kPa) or more is generated. providing a drain discharge pipe 2 having, it communicates the one end 2 -1 in the lower portion of the drain tank (not shown) of the low pressure first feed water heater 1 unit, the intermediate portion 2 -3 in a state flexed into U-shape the other end portion 2-2 is obtained by adapted to communicate with the bottom of the condenser 3 to submerge the drain water D.

これにより、本実施形態では、低負荷から定格負荷までをＵシール機能を備えたドレン排出管２によってドレンを排出させることが可能となる。また、低圧第１給水加熱器１内の熱交換チューブから給水が漏れた場合、低圧第１給水加熱器１側の圧力が高くなることにより、過剰なドレンはドレン排出管２を通って復水器３に流れ込むので、蒸気タービンプラントを良好な運転を保つことができる。   Thereby, in this embodiment, it becomes possible to discharge drain from the low load to the rated load by the drain discharge pipe 2 having the U-seal function. Moreover, when water supply leaks from the heat exchange tube in the low-pressure first feed water heater 1, the pressure on the low-pressure first feed water heater 1 side increases, so that excess drain passes through the drain discharge pipe 2 and condensates. Since it flows into the vessel 3, the steam turbine plant can be kept in good operation.

以上述べたように、特許文献１に記載の技術であれば、給水加熱器の附帯設備としてドレン冷却器を設け、このドレン冷却器によりドレンを過冷却して次段の給水加熱器か復水器へと流すように構成する必要があったが、本実施形態によれば、低圧第１給水加熱器１の器内圧力と、復水器３の器内圧力との差圧に以上のヘッド差を有するＵシール機能を備えたドレン排出管２によって、低圧第１給水加熱器１と復水器３とを連通させるように構成したので、低圧給水加熱器１と復水器３との器内圧力差を利用した圧力バランス方式を採用することができる。
この結果、大口径のドレン排出管、ドレン水位調節弁、ドレンを過冷却するためのドレン冷却器等を設ける必要がなく、構成機器の最適化を図ることができる。 As described above, according to the technique described in Patent Document 1, a drain cooler is provided as an auxiliary facility for the feed water heater, and the drain cooler is supercooled by the drain cooler, and the next stage feed water heater or condensate However, according to the present embodiment, the above-described head has a difference in pressure between the internal pressure of the low-pressure first feed water heater 1 and the internal pressure of the condenser 3. Since the low pressure first feed water heater 1 and the condenser 3 are made to communicate with each other by the drain discharge pipe 2 having a U-seal function having a difference, the unit of the low pressure feed water heater 1 and the condenser 3 A pressure balance method using an internal pressure difference can be adopted.
As a result, it is not necessary to provide a large-diameter drain discharge pipe, a drain water level control valve, a drain cooler for supercooling the drain, and the like, and the components can be optimized.

（第２の実施形態）
図２は、本発明の第２の実施形態に係る低圧給水加熱器のドレン水位制御を行うプロセス系統図である。 (Second Embodiment)
FIG. 2 is a process system diagram for performing drain water level control of the low-pressure feed water heater according to the second embodiment of the present invention.

本実施形態は、図２で示すように、第１の実施形態のドレン排出管２と復水器３との間に、ドレン排出管２の底部に滞留した汚泥を復水器３内に排出するための開閉弁１０を追加したことを特徴とするものである。なお、この開閉弁１０は常閉弁しており、後述する水位検出器５の動作により開弁するようになっている。   In the present embodiment, as shown in FIG. 2, sludge accumulated at the bottom of the drain discharge pipe 2 is discharged into the condenser 3 between the drain discharge pipe 2 and the condenser 3 of the first embodiment. The on-off valve 10 for doing this is added. The on-off valve 10 is normally closed and is opened by the operation of a water level detector 5 described later.

ドレン排出管２は中間部分２−３をＵ字形に撓ませているので、運転中にその最低部分すなわち底部に汚泥が徐々に滞留する場合がある。汚泥の滞留によってドレン排出流路が閉塞されると、低圧第１給水加熱器１の図示していないドレンタンクの水位が上昇する。 Since the drain discharge pipe 2 is flexed intermediate portion 2 -3 into a U, in some cases sludge stagnates gradually to its lowest portion or bottom during operation. When the drain discharge passage is closed due to sludge retention, the water level of a drain tank (not shown) of the low-pressure first feed water heater 1 rises.

このドレンタンクの水位が予定の設定値以上に上昇した場合、水位検出器５が動作して常時閉路している開閉弁１０を開弁することによって、汚泥等の滞留物を復水器３内に排出する。   When the water level of the drain tank rises above a predetermined set value, the water level detector 5 operates to open the on-off valve 10 that is normally closed, thereby removing accumulated matter such as sludge in the condenser 3. To discharge.

このように、本実施形態によれば、第１の実施形態の奏する効果に加えて、Ｕ字形のドレン排出管２の底部に汚泥等の滞留によってドレン水位が上昇した場合、開閉弁１０を開弁させてドレンを復水器３内に排出するようにしたので、ドレンタンクの水位上昇を回避することが可能である。   Thus, according to the present embodiment, in addition to the effects of the first embodiment, when the drain water level rises due to the stay of sludge or the like at the bottom of the U-shaped drain discharge pipe 2, the on-off valve 10 is opened. Since the drain is discharged into the condenser 3, the rise in the water level of the drain tank can be avoided.

（第３の実施形態）
図３は、本発明の第３の実施形態に係る低圧給水加熱器のドレン水位制御を行うプロセス系統図である。 (Third embodiment)
FIG. 3 is a process system diagram for performing drain water level control of the low-pressure feed water heater according to the third embodiment of the present invention.

本実施形態は、図３で示すように、図1で示した第１の実施形態に対して、低圧第１給水加熱器１内で上段部に位置する給水加熱器（便宜上、上段給水加熱器と称する）１Ｕと下段部に位置する給水加熱器（便宜上、下段給水加熱器と称する）１Ｄ間を復水バイパスライン１１によって連通させ、かつ、上段給水加熱器１Ｕと復水器３との間を第２のドレン排出管１２で連通させて、その第２のドレン排出管１２に水位調節弁１３を設け、さらに、第２のドレン排出管１２と給水加熱器１の下段給水加熱器１Ｄとの間を第３のドレン配水管１４で連通させてその第３のドレン配水管１４に水位調節弁１５を設けるように構成したものである。なお、本実施形態またはその他において、ドレン排出管２を、便宜上第１のドレン排出管２と称する場合がある。   As shown in FIG. 3, the present embodiment is different from the first embodiment shown in FIG. 1 in that the feed water heater (for convenience, the upper feed water heater located in the upper stage in the low pressure first feed water heater 1 is used. 1U) and a feed water heater (referred to as a lower feed water heater) 1D located at the lower stage are connected by a condensate bypass line 11 and between the upper feed water heater 1U and the condenser 3 Are connected to each other through the second drain discharge pipe 12, and a water level control valve 13 is provided in the second drain discharge pipe 12. Further, the second drain discharge pipe 12 and the lower stage feed water heater 1D of the feed water heater 1 are provided. The third drain water distribution pipe 14 communicates with each other, and the third drain water distribution pipe 14 is provided with a water level adjustment valve 15. In this embodiment or others, the drain discharge pipe 2 may be referred to as a first drain discharge pipe 2 for convenience.

本実施形態の場合、蒸気タービンプラントの通常運転時では復水バイパスライン１１および第２のドレン排出管１２の水位調節弁１３を閉路しており、低圧第１給水加熱器１内で生じたドレンは第１のドレン排出管２によって復水器３内に排出される。   In the case of this embodiment, the water level control valve 13 of the condensate bypass line 11 and the second drain discharge pipe 12 is closed during normal operation of the steam turbine plant, and the drain generated in the low-pressure first feed water heater 1 is closed. Is discharged into the condenser 3 by the first drain discharge pipe 2.

しかし、低圧第1給水加熱器１内の熱交換チューブの給水漏れによってドレンタンクの水位が予定値以上に上昇した場合、水位検出器５が動作し、バイパスライン１１および水位調節弁１３を開操作するとともに、第３のドレン配水管１４の水位調節弁１５を全閉させる。   However, when the water level in the drain tank rises above a predetermined value due to a water supply leak in the heat exchange tube in the low-pressure first feed water heater 1, the water level detector 5 operates and opens the bypass line 11 and the water level control valve 13. At the same time, the water level control valve 15 of the third drain water pipe 14 is fully closed.

バイパスライン１１の全開、水位調節弁１５の全閉により、ドレンタンク内の水位上昇を抑制しつつ、通常運転のドレンの排出量よりも多量になったドレン（漏れた給水を含む）は、第１のドレン排出管２を通って復水器３に排出されるとともに、第２のドレン排出管１２および水位調節弁１３を通って復水器３内に排出される。   Drain (including leaked water supply) that has become larger than the drain discharge amount during normal operation while suppressing the rise of the water level in the drain tank by fully opening the bypass line 11 and fully closing the water level control valve 15 1 is discharged to the condenser 3 through the drain discharge pipe 2, and is discharged into the condenser 3 through the second drain discharge pipe 12 and the water level control valve 13.

以上述べたように、本実施形態によれば、第１の実施形態の奏する効果に加えて、熱交換チューブからの給水が漏れるような緊急事態の場合であっても、給水加熱器１に設けた水位検出器の動作によって、上段給水加熱器１Ｕからのドレン流入ライン１４の水位調節弁１５を全閉させ、かつ、上段給水加熱器１Ｕから復水器３へドレンを回収するための水位調節弁１３を開操作することによって、低圧第１給水加熱器１のドレンタンクの水位上昇を回避することができ、正常に蒸気タービンプラントを運転することが可能となる。   As described above, according to the present embodiment, in addition to the effects of the first embodiment, the feed water heater 1 is provided even in the case of an emergency situation where the feed water from the heat exchange tube leaks. By the operation of the water level detector, the water level adjustment valve 15 of the drain inflow line 14 from the upper stage water heater 1U is fully closed, and the water level is adjusted to recover the drain from the upper stage water heater 1U to the condenser 3. By opening the valve 13, it is possible to avoid an increase in the water level of the drain tank of the low-pressure first feed water heater 1 and to operate the steam turbine plant normally.

（第４の実施形態）
図４は、本発明の第４の実施形態に係る低圧給水加熱器のドレン水位制御を行うプロセス系統図である。 (Fourth embodiment)
FIG. 4 is a process system diagram for performing drain water level control of the low-pressure feed water heater according to the fourth embodiment of the present invention.

本実施形態は、図４に示すように、第１の実施形態（図１）から第３の実施形態（図４）で設けた装置や部品を全て備えるように構成したもので、各実施形態の効果を全て奏することができる。   As shown in FIG. 4, the present embodiment is configured to include all the devices and components provided in the first embodiment (FIG. 1) to the third embodiment (FIG. 4). All the effects can be achieved.

（その他）
以上述べた第１〜第４の実施形態では、Ｕ字形のドレン排水管を採用する例を示したが、ドレン排水管の形状はＵ字形に限定する必要はなく、Ｌ字状でもよい。要は、Ｕシール機能を備えていればよい。 (Other)
In the first to fourth embodiments described above, an example in which a U-shaped drain drain pipe is employed has been shown. However, the drain drain pipe need not be limited to a U-shape, and may be L-shaped. In short, it is only necessary to have a U-seal function.

本発明の第１の実施形態に係る低圧給水加熱器のドレン水位制御装置のプロセス系統図。The process system figure of the drain water level control apparatus of the low voltage | pressure feed water heater which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係る低圧給水加熱器のドレン水位制御装置のプロセス系統図。The process system diagram of the drain water level control apparatus of the low voltage | pressure feed water heater which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る低圧給水加熱器のドレン水位制御装置のプロセス系統図。The process system diagram of the drain water level control apparatus of the low voltage | pressure feed water heater which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施形態に係る低圧給水加熱器のドレン水位制御装置のプロセス系統図。The process system diagram of the drain water level control apparatus of the low voltage | pressure feed water heater which concerns on the 4th Embodiment of this invention. 従来の発電プラント設備における一般的な低圧給水加熱器ドレン水位制御装置のプロセス系統図。The process system diagram of the general low-pressure feed water heater drain water level control apparatus in the conventional power plant equipment. 従来の発電プラント設備における改良された低圧給水加熱器ドレン水位制御装置のプロセス系統図。The process system diagram of the low-pressure feed water heater drain water level control apparatus improved in the conventional power plant equipment.

符号の説明Explanation of symbols

１…低圧第1給水加熱器、１Ｕ…上段給水加熱器、１Ｄ…下段給水加熱器、２…第１のドレン排出管、３…復水器、５…水位検出器、１０…開閉弁、１１…復水バイパスライン、１２…第２のドレン排出管、１３…水位調節弁、１４…第３のドレン排出管、１５…水位調節弁。   DESCRIPTION OF SYMBOLS 1 ... Low pressure 1st feed water heater, 1U ... Upper stage feed water heater, 1D ... Lower stage feed water heater, 2 ... 1st drain discharge pipe, 3 ... Condenser, 5 ... Water level detector, 10 ... On-off valve, 11 ... condensate bypass line, 12 ... second drain discharge pipe, 13 ... water level control valve, 14 ... third drain discharge pipe, 15 ... water level control valve.

Claims (6)

低圧給水加熱器のドレンをドレン排水管によって復水器に排出するようにしたドレン水位制御装置において、
前記低圧給水加熱器の器内圧力と、前記復水器の器内圧力との差圧以上のヘッド差を有し、Ｕシール機能を備えたドレン排水管により低圧給水加熱器と復水器底部とを連通させることを特徴とした低圧給水加熱器のドレン水位制御装置。 In the drain water level control device configured to discharge the drain of the low-pressure feed water heater to the condenser through the drain drain pipe,
The low pressure feed water heater and the bottom of the condenser have a head difference equal to or greater than the differential pressure between the internal pressure of the low pressure feed water heater and the internal pressure of the condenser, and a drain drain pipe having a U seal function. A drain water level control device for a low-pressure feed water heater, wherein 前記低圧給水加熱器に設けられ、ドレン水位が予定値以上になると動作するドレン水位検出器と、
前記ドレン排水管の最低部位よりも高い部位と前記復水器器内とを連通する弁であって、常時閉弁し、前記ドレン水位検出器の動作により開弁する開閉弁と、
を備えたことを特徴とする請求項１記載の低圧給水加熱器のドレン水位制御装置。 A drain water level detector provided in the low-pressure feed water heater and operating when the drain water level exceeds a predetermined value;
A valve that communicates a portion higher than the lowest portion of the drain drain pipe with the inside of the condenser, and is normally closed, and an open / close valve that is opened by the operation of the drain water level detector;
The drain water level control device for a low-pressure feed water heater according to claim 1. 前記低圧給水加熱器に設けられ、ドレン水位が予定値以上になると動作するドレン水位検出器と、
前記低圧給水加熱器の上部給水加熱器および下部給水加熱器間に設けられ、常時閉路し、前記ドレン水位検出器の動作によって開路して前記上部給水加熱器および下部給水加熱器間をバイパスする復水バイパスラインと、
前記上部給水加熱器と前記復水器器内とを連通する第２のドレン排出管に設けられ、前記ドレン水位検出器の動作により開操作される水位調整弁と、
を備えたことを特徴とする請求項１記載の低圧給水加熱器のドレン水位制御装置。 A drain water level detector provided in the low-pressure feed water heater and operating when the drain water level exceeds a predetermined value;
It is provided between the upper feed water heater and the lower feed water heater of the low pressure feed water heater, is normally closed, and is opened by the operation of the drain water level detector to bypass between the upper feed water heater and the lower feed water heater. A water bypass line,
A water level adjusting valve provided in a second drain discharge pipe communicating with the upper feed water heater and the condenser, and opened by an operation of the drain water level detector;
The drain water level control device for a low-pressure feed water heater according to claim 1. 前記低圧給水加熱器に設けられ、ドレン水位が予定値以上になると動作するドレン水位検出器と、
前記上部給水加熱器と前記復水器器内とを連通する第２のドレン排出管に設けられ、前記ドレン水位検出器の動作によって開操作される水位調整弁と、
前記第２のドレン排出管と前記低圧給水加熱器の下部給水加熱器との間を連通する第３のドレン排出管に設けられ、常時開弁し、前記ドレン水位検出器の動作によって閉弁する水位調整弁と、
を備えたことを特徴とする請求項１記載の低圧給水加熱器のドレン水位制御装置。 A drain water level detector provided in the low-pressure feed water heater and operating when the drain water level exceeds a predetermined value;
A water level adjusting valve provided in a second drain discharge pipe communicating with the upper feed water heater and the condenser, and opened by an operation of the drain water level detector;
Provided in a third drain discharge pipe communicating between the second drain discharge pipe and the lower feed water heater of the low-pressure feed water heater, always open, and closed by the operation of the drain water level detector A water level adjustment valve;
The drain water level control device for a low-pressure feed water heater according to claim 1. 前記低圧給水加熱器の上部給水加熱器および下部給水加熱器間に設けられ、常時閉路し、前記ドレン水位検出器の動作によって開路して前記上部給水加熱器および下部給水加熱器間をバイパスする復水バイパスライン、
を備えたことを特徴とする請求項４記載の低圧給水加熱器のドレン水位制御装置。 It is provided between the upper feed water heater and the lower feed water heater of the low pressure feed water heater, is normally closed, and is opened by the operation of the drain water level detector to bypass between the upper feed water heater and the lower feed water heater. Water bypass line,
The drain water level control device for a low-pressure feed water heater according to claim 4. 請求項１乃至５に記載の低圧給水加熱器のドレン水位制御装置を有する蒸気タービンプラント。   A steam turbine plant comprising the drain water level control device for a low-pressure feed water heater according to claim 1.
JP2007304512A 2007-11-26 2007-11-26 Drain control device of low pressure water supply heater and steam turbine plant Pending JP2009127952A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114034033A (en) * 2021-10-30 2022-02-11 国家能源集团华北电力有限公司廊坊热电厂 Heater liquid level control method and terminal for heat-engine plant feed water regenerative system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114034033A (en) * 2021-10-30 2022-02-11 国家能源集团华北电力有限公司廊坊热电厂 Heater liquid level control method and terminal for heat-engine plant feed water regenerative system
CN114034033B (en) * 2021-10-30 2023-10-20 国家能源集团华北电力有限公司廊坊热电厂 Liquid level control method and terminal for heater of water supply and heat recovery system of thermal power plant

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