JPS61243204A - Moisture separating reheater drain discharger - Google Patents
Moisture separating reheater drain dischargerInfo
- Publication number
- JPS61243204A JPS61243204A JP8242085A JP8242085A JPS61243204A JP S61243204 A JPS61243204 A JP S61243204A JP 8242085 A JP8242085 A JP 8242085A JP 8242085 A JP8242085 A JP 8242085A JP S61243204 A JPS61243204 A JP S61243204A
- Authority
- JP
- Japan
- Prior art keywords
- drain
- reheater
- stage
- reservoir
- pressure
- 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
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
- Sink And Installation For Waste Water (AREA)
- Extraction Or Liquid Replacement (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〕
本発明は湿分分離一段再熱器凝縮ドレンの排出に係シ、
特に、フラッシング現象を伴う圧力急減時にドレン排出
を円滑ならしめる再熱器ドレン排出装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the discharge of a moisture separation single-stage reheater condensate drain;
In particular, the present invention relates to a reheater drain discharge device that smoothes drain discharge when the pressure suddenly decreases due to a flushing phenomenon.
特公昭54−2329号公報に開示されているように、
従来の一段再熱器ドレン排出系統には再熱器ドレン溜部
にベント管を設置し、強制的に5〜10チの蒸気を抜き
、ドレン溜部ドレンは重力排出にてドレン配管を通って
ドレンタンク・\排出しているが、圧力急減時、ドレン
配管内ドレンの7ラツシングが伴うとフラッシング蒸気
の逆流によりドレン排出が阻害され、ドレンの蓄積量が
増加する。As disclosed in Japanese Patent Publication No. 54-2329,
In the conventional one-stage reheater drain discharge system, a vent pipe is installed in the reheater drain reservoir, 5 to 10 inches of steam is forcibly removed, and the drain from the drain reservoir is drained by gravity through the drain pipe. The drain tank is being discharged, but when the pressure suddenly decreases, if the drain in the drain piping is lashed, the backflow of flushing steam will inhibit drain discharge and increase the amount of accumulated condensate.
第2図は圧力減少率とドレン蓄積率の関係を示す。圧力
減少率が増せばドレン蓄積針が直線的に増え、フラッシ
ング蒸気がドレン排出を阻害する。FIG. 2 shows the relationship between pressure reduction rate and condensate accumulation rate. As the pressure reduction rate increases, the number of condensate accumulation needles increases linearly, and the flushing steam obstructs condensate discharge.
本発明の目的は圧力急減時、一段再熱器凝縮ドレンが急
#にフラッシング現象をおこす場合でもドレン蓄積量を
少なくシ、ドレン排出を円滑ならしめる装置を提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus that can reduce the amount of accumulated condensate and smoothly discharge the condensate even when the single-stage reheater condensate condensate suddenly causes a flushing phenomenon when the pressure suddenly decreases.
負荷減少時、高圧タービン段落圧力の急減に伴い一段再
熱器ドレン圧力も急減する。このため、・−設合熱器ド
レン溜部およびドレン配管内のドレンがフラッシュし、
このフラッシュ蒸気のためにドレン排出が阻害され、ド
レン溜部のドレン水位が異常上昇する。この現象をさけ
るため下流部に6るドレンタンクにオリフィスをもった
ベント管を設置しくベント管の接続先は再熱器ドレン溜
部より圧力の低い給水加熱器)−設合熱器ドレン溜部か
らドレンタンク−・のドレン排出系において、圧力差を
もたせることにより、従来の重力排出系フ
に比べてドレンの排出を円滑ならしめるようにした。When the load decreases, the high pressure turbine stage pressure decreases rapidly, and the first reheater drain pressure also decreases rapidly. As a result, the drain in the combined heater drain reservoir and drain piping flushes,
This flash steam obstructs drain discharge and causes the drain water level in the drain reservoir to rise abnormally. To avoid this phenomenon, a vent pipe with an orifice should be installed in the downstream drain tank.The vent pipe should be connected to the feed water heater, which has a lower pressure than the reheater drain tank. By creating a pressure difference in the drain discharge system of the drain tank, the drain can be discharged more smoothly than in the conventional gravity discharge system.
本発明の一実施例を第1図により説明する。 An embodiment of the present invention will be described with reference to FIG.
高圧タービン排気より出た蒸気は湿分分離再熱器1の湿
分分離器2を経て、湿分が除かれた後、−設置熱器3、
二段書熱器4により再熱され、低圧タービンへ導ひかれ
る。The steam coming out of the high-pressure turbine exhaust passes through the moisture separator 2 of the moisture separator reheater 1, and after moisture is removed, - the installed heater 3;
It is reheated by the two-stage heater 4 and guided to the low pressure turbine.
一方、加熱蒸気源を高圧タービン段落からの抽・ 気蒸
気とする一段再熱器3における伝熱管内の凝縮ドレンは
ドレン溜部13に回収される。このドレン溜部13には
伝熱管内流動不安定を防止するための一段再熱器ベント
管6とドレンを一段再熱器ドレンタンク8へ排出するた
めの一設置熱器ドレン管7とが設置されている。−設置
熱器ドレンタンク8にはドレン溜部13とドレンタンク
8との間に圧力差をもたせ、ドレン溜部13のドレンを
差圧により一段再熱器ドレンタンク8へ排出可能とする
ために、オリフィスをもつベント管9がレン溜部13よ
りもドレンタンク8内の圧力を低く保つことができるた
め、従来のドレン溜部13とドレンタンク8との位置水
頭を利用した重力排出に比べて、ドレン溜部13内のド
レンをドレンタンク8へ強制的に排出することができる
。このように構成することにより、通常運転中は、ドレ
ン溜部13よりドレンタンク8内に流入したドレンの一
部がフラッシュし、このフラッシュ蒸気はオリフィスを
もつベント管9を通って給水加熱器12へ排出され、残
りのドレンは水位調節弁をもつたドレンタンクドレン配
管14を通って給水加熱器11へ回収される。On the other hand, condensed condensate in the heat transfer tubes of the single-stage reheater 3 whose heating steam source is extracted steam from the high-pressure turbine stage is collected in the condensate reservoir 13. This drain reservoir section 13 is equipped with a single-stage reheater vent pipe 6 for preventing flow instability in the heat exchanger tubes and a single-stage reheater drain pipe 7 for discharging condensate into the single-stage reheater drain tank 8. has been done. - The installed heater drain tank 8 is provided with a pressure difference between the drain reservoir 13 and the drain tank 8, so that the drain in the drain reservoir 13 can be discharged to the single-stage reheater drain tank 8 due to the pressure difference. Since the vent pipe 9 with an orifice can keep the pressure in the drain tank 8 lower than that in the drain reservoir 13, compared to the conventional gravity drainage using the positional water head between the drain reservoir 13 and the drain tank 8. , the drain in the drain reservoir 13 can be forcibly discharged to the drain tank 8. With this configuration, during normal operation, a portion of the drain flowing into the drain tank 8 from the drain reservoir 13 flashes, and this flash steam passes through the vent pipe 9 having an orifice to the feed water heater 12. The remaining drain is collected into the feed water heater 11 through a drain tank drain pipe 14 having a water level control valve.
また、負荷急減時などの減圧過程では、高圧タービン段
落圧力も急低下するため再熱器ドレン溜部13やドレン
管7の圧力も低下する。このため、ドレン溜部13内や
ドレン管7内の凝縮ドレンが急激にフラッシングを起こ
す。この場合、従来のような重力排出の場合には、フラ
ッシング蒸気がドレン溜部13へ逆流するため、ドレン
排出が阻害され、ドレン溜部13内のドレン蓄積量が増
し、ドレンレベルが上昇する。これに対し、本発明のよ
ウニ、ドレン溜部13のドレンを差圧によって強制的に
ドレンタンク8内へ排出する場合には、フラッシュ蒸気
とドレンの混合二相流を強制的にドレンタンク8内へ排
出できるため、再熱器ドレンがドレン溜部13へ蓄積さ
れるのを防止することができ、ドレン溜部13内のドレ
ンレベルの上昇を防止することができる。Further, in a pressure reduction process such as when the load suddenly decreases, the high-pressure turbine stage pressure also rapidly decreases, so the pressure in the reheater drain reservoir 13 and the drain pipe 7 also decreases. Therefore, the condensed drain in the drain reservoir 13 and the drain pipe 7 rapidly flushes. In this case, in the case of conventional gravity discharge, the flushing steam flows back into the drain reservoir 13, thereby inhibiting drain discharge, increasing the amount of drain accumulated in the drain reservoir 13, and raising the drain level. On the other hand, when the drain in the drain reservoir 13 is forcibly discharged into the drain tank 8 by the pressure difference according to the present invention, a mixed two-phase flow of flash steam and drain is forced into the drain tank 8. Since the reheater drain can be discharged to the inside, it is possible to prevent the reheater drain from being accumulated in the drain reservoir 13, and it is possible to prevent the drain level in the drain reservoir 13 from increasing.
本実施例によれば、通常運転時でも、また圧力急減時で
も、−設合熱器ドレン溜部13のドレンを安定して排出
でき、ドレンレベルの上昇を防止することができる。According to this embodiment, even during normal operation or when the pressure suddenly decreases, the drain from the integrated heater drain reservoir 13 can be discharged stably, and an increase in the drain level can be prevented.
なお、図中5は一段再熱器加熱蒸気管、10は湿分分離
器ドレンタンク、第3図は一段再熱器ドレン蓄積率と効
率低下を示す図である。In the figure, 5 is a single-stage reheater heating steam pipe, 10 is a moisture separator drain tank, and FIG. 3 is a diagram showing the single-stage reheater drain accumulation rate and efficiency reduction.
本発明によれば、圧力急減時でも再熱器ドレン溜部のド
レンレベルを安定にすることにより、機器損傷を防止す
るばかりでなく、再熱器ドレンの給水加熱器への熱回収
率を良くするため、効率低下を防止しプラントの信頼性
が向上する。According to the present invention, by stabilizing the drain level in the reheater drain reservoir even when the pressure suddenly decreases, it is possible to not only prevent equipment damage but also improve the heat recovery rate of the reheater drain to the feed water heater. This prevents a decrease in efficiency and improves plant reliability.
第1図は本発明の一実施例の一段再熱器ドレン排出系統
図、第2図は圧力減少とドレン蓄積率の関係図、第3図
はドレン蓄積率とプラント効率低下の関係図である。
1・・・湿分分離再熱器、9・・・−殺害熱器ドレンタ
ンクベント管、10・・・湿分分離器ドレンタンク、1
1・・・N011給水加熱器、12・・・No、2給水
加熱器、13・・・−設合熱器ドレン溜部、14・・・
ドレンタンクドレン配管。Figure 1 is a drain discharge system diagram of a single-stage reheater according to an embodiment of the present invention, Figure 2 is a diagram showing the relationship between pressure reduction and condensate accumulation rate, and Figure 3 is a diagram showing the relationship between condensate accumulation rate and plant efficiency reduction. . 1...Moisture separator reheater, 9...-Killing heater drain tank vent pipe, 10...Moisture separator drain tank, 1
1...N011 feed water heater, 12...No, 2 feed water heater, 13...-installed combined heater drain reservoir, 14...
Drain tank drain piping.
Claims (1)
分分離再熱器を経て、低圧タービン入口に至る蒸気を高
圧タービン段落からの抽気蒸気で加熱する一段再熱器に
おいて、 一段再熱器ドレン溜部とドレンタンクとをドレン配管で
連結し、かつ、ドレンタンクの蒸気層部にはオリフィス
をもったベント管を設置し、このベント管を前記一段再
熱器ドレン溜部より低い圧力の給水加熱器へ連結したこ
とを特徴とする湿分分離再熱器ドレン排出装置。[Scope of Claims] 1. In a single-stage reheater in which steam from the high-pressure turbine exhaust of a nuclear two-stage reheating plant passes through a moisture separation reheater and reaches a low-pressure turbine inlet is heated with extracted steam from a high-pressure turbine stage. , The first-stage reheater drain reservoir and the drain tank are connected by a drain pipe, and a vent pipe with an orifice is installed in the steam layer of the drain tank, and this vent pipe is connected to the first-stage reheater drain reservoir. A moisture separator reheater drain discharge device, characterized in that it is connected to a feed water heater having a pressure lower than that of the moisture separator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8242085A JPS61243204A (en) | 1985-04-19 | 1985-04-19 | Moisture separating reheater drain discharger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8242085A JPS61243204A (en) | 1985-04-19 | 1985-04-19 | Moisture separating reheater drain discharger |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61243204A true JPS61243204A (en) | 1986-10-29 |
JPH0544562B2 JPH0544562B2 (en) | 1993-07-06 |
Family
ID=13774093
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8242085A Granted JPS61243204A (en) | 1985-04-19 | 1985-04-19 | Moisture separating reheater drain discharger |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61243204A (en) |
-
1985
- 1985-04-19 JP JP8242085A patent/JPS61243204A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0544562B2 (en) | 1993-07-06 |
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