JPH07174304A - Water level controller for feed water heater - Google Patents
Water level controller for feed water heaterInfo
- Publication number
- JPH07174304A JPH07174304A JP31885893A JP31885893A JPH07174304A JP H07174304 A JPH07174304 A JP H07174304A JP 31885893 A JP31885893 A JP 31885893A JP 31885893 A JP31885893 A JP 31885893A JP H07174304 A JPH07174304 A JP H07174304A
- Authority
- JP
- Japan
- Prior art keywords
- feed water
- water level
- water heater
- drain
- signal
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は蒸気タービンからの抽気
で給水を加熱する給水加熱器に付設される給水加熱器水
位制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed water heater water level control device attached to a feed water heater which heats feed water by extraction air from a steam turbine.
【０００２】[0002]
【従来の技術】一般に、火力または原子力発電プラント
の如き蒸気タービンプラントにおいては、蒸気タービン
で仕事を終えた蒸気を復水器に導いて復水させ、得られ
た復水を複数段の給水加熱器を通して加熱し、昇温させ
た後にボイラまたは原子炉内へ環流させるようにしてい
る。2. Description of the Related Art Generally, in a steam turbine plant such as a thermal power plant or a nuclear power plant, steam that has finished work in a steam turbine is introduced into a condenser to be condensed, and the obtained condensate is heated by a plurality of stages of feed water. It is heated through a vessel to raise the temperature and then circulated into the boiler or reactor.
【０００３】給水加熱器の熱源としては、高圧あるいは
低圧タービンから抽気された蒸気が使用され、この蒸気
は給水加熱器内で復水との熱交換によって冷却され、ド
レンとなって給水加熱器内に貯溜された後、順次復水と
熱交換させるように給水加熱器および復水器へ送られ
る。As the heat source of the feed water heater, steam extracted from a high-pressure or low-pressure turbine is used, and this steam is cooled by heat exchange with condensate in the feed water heater and becomes a drain inside the feed water heater. After being stored in the condensate, it is sent to the feed water heater and the condenser so as to sequentially exchange heat with the condensate.
【０００４】ところで、給水加熱器としては、一般に復
水または給水が高圧であるため、多管式熱交換器が用い
られ、加熱管内に給水を管外に抽気された蒸気あるいは
ドレンを流動させ、壁面で熱交換を行うように構成され
ている。給水加熱器のドレン冷却部には蒸気が凝縮した
ドレンが貯溜される。By the way, as the feed water heater, since condensate water or feed water is generally at high pressure, a multi-tube heat exchanger is used, and the feed water is made to flow into the heating pipe, or the steam or drain extracted outside the pipe is made to flow. It is configured to perform heat exchange on the wall. Drain in which steam is condensed is stored in the drain cooling section of the feed water heater.
【０００５】また、給水加熱器には通常、ドレン水位を
所定レベルに制御するドレン水位制御装置が設けられて
いる。図６は従来の一般的な復水器ないし低圧給水加熱
器の系統図であって、蒸気タービン１には復水器２、低
圧給水加熱器３，４が直結されている。Further, the feed water heater is usually provided with a drain water level control device for controlling the drain water level to a predetermined level. FIG. 6 is a system diagram of a conventional general condenser or low-pressure feed water heater. A steam turbine 1 is directly connected to a condenser 2 and low-pressure feed water heaters 3 and 4.
【０００６】復水器２には復水ポンプ５、グランド蒸気
復水器６、脱塩装置７および復水ブースターポンプ８が
順次連結され、この復水ブースターポンプで加圧された
復水は低圧給水加熱器３，４で加熱され、更に、図示を
省略した給水ポンプおよび高圧給水加熱器を経てボイラ
または原子炉へ供給される。A condensate pump 5, a gland steam condenser 6, a demineralizer 7 and a condensate booster pump 8 are sequentially connected to the condenser 2, and the condensate pressurized by the condensate booster pump is low pressure. It is heated by the feed water heaters 3 and 4, and is further supplied to the boiler or the reactor through a feed water pump and a high pressure feed water heater (not shown).
【０００７】低圧給水加熱器４には水位検出器９が設置
され、水位信号は水位調節計10に導かれて調節弁11を制
御する。水位検出器９からの水位信号は水位調節計12に
も導かれ、調節弁13を制御する。A water level detector 9 is installed in the low-pressure feed water heater 4, and a water level signal is guided to a water level controller 10 to control a control valve 11. The water level signal from the water level detector 9 is also guided to the water level controller 12 and controls the control valve 13.
【０００８】また、低圧給水加熱器３には水位検出器14
が設置され、水位信号は水位調節計15に導かれ、調節弁
16を制御する。復水器17は復水器２、復水ポンプ５、グ
ランド蒸気復水器６、脱塩装置７、復水ブースターポン
プ８、低圧給水加熱器３，４および給水ポンプ（図示せ
ず）の間を連結している。The low-pressure feed water heater 3 has a water level detector 14
Is installed, the water level signal is guided to the water level controller 15, and the control valve
Control 16 The condenser 17 is provided between the condenser 2, the condensate pump 5, the gland steam condenser 6, the desalination device 7, the condensate booster pump 8, the low pressure feed water heaters 3 and 4 and the feed water pump (not shown). Are connected.
【０００９】ドレン管18は低圧給水加熱器４のドレンを
調節弁11を介して復水器２に導くと共に、調節弁13を介
して低圧給水加熱器３に導く。ドレン管19は低圧給水加
熱器３のドレンを調節弁16を介して復水器２に導く。ま
た、蒸気タービン１の途中段落と低圧給水加熱器３，４
との間はタービン抽気管20，21によって連結されてい
る。The drain pipe 18 guides the drain of the low-pressure feed water heater 4 to the condenser 2 via the control valve 11 and to the low-pressure feed water heater 3 via the control valve 13. The drain pipe 19 guides the drain of the low-pressure feed water heater 3 to the condenser 2 via the control valve 16. In addition, the middle stage of the steam turbine 1 and the low-pressure feed water heaters 3, 4
Turbine extraction pipes 20 and 21 are connected between and.
【００１０】上述のような構成の復水系統において、蒸
気タービン１にて仕事をした蒸気の一部は、タービン抽
気管20を介して低圧給水加熱器４へ導かれ、加熱管（図
示せず）内を流れる復水と熱交換を行い、給水加熱器ド
レンとして、ドレン管18を通り、調節弁11，13を介して
低圧給水加熱器３および復水器２へ回収される。In the condensate system having the above-mentioned structure, part of the steam that has worked in the steam turbine 1 is introduced to the low-pressure feed water heater 4 via the turbine extraction pipe 20 and heated by a heating pipe (not shown). ) Heat is exchanged with the condensate flowing through the inside of the pipe) and is recovered as a feed water heater drain through the drain pipe 18 and the low pressure feed water heater 3 and the condenser 2 via the control valves 11 and 13.
【００１１】また、低圧給水加熱器３では、タービン抽
気管21からの蒸気と低圧給水加熱器４からのドレンによ
り、復水との熱交換が行われ、給水加熱器ドレンとして
復水器２へ回収される。Further, in the low-pressure feed water heater 3, the steam from the turbine extraction pipe 21 and the drain from the low-pressure feed water heater 4 perform heat exchange with the condensate, and the heat is drained to the condenser 2 as the drain of the feed water heater. Be recovered.
【００１２】復水器２内に貯溜された復水は、前述した
ように、復水管17により、復水ポンプ５ないし復水ブー
スタポンプ８を通り、低圧給水加熱器３，４で徐々に昇
温された後、再びボイラへ送られ、得られた主蒸気が蒸
気タービン１へ送られ、膨張を遂げた後、復水器２へ排
出される。The condensate stored in the condenser 2 passes through the condensate pump 5 or the condensate booster pump 8 by the condensate pipe 17 and gradually rises by the low-pressure feed water heaters 3, 4 as described above. After being heated, it is sent to the boiler again, the obtained main steam is sent to the steam turbine 1, expanded, and then discharged to the condenser 2.
【００１３】図７は図６で説明した低圧給水加熱器３の
構造を説明するものである。復水入口部30より胴体内へ
導入される復水は、復水出口部31へ達するまでに、抽気
入口部32から流入する加熱蒸気と、前段ドレン入口部33
から流入するドレンにより暖められて行く。FIG. 7 illustrates the structure of the low pressure feed water heater 3 described with reference to FIG. Condensate introduced into the fuselage from the condensate inlet section 30 is heated steam flowing from the extraction inlet section 32 and the pre-stage drain inlet section 33 before reaching the condensate outlet section 31.
It is warmed by the drain flowing in from.
【００１４】低圧給水加熱器３の胴体内はタービン抽気
蒸気によって復水を昇温する過熱戻し部Ｚ１、さらに蒸
気熱を復水と交換してドレン化させる凝縮部Ｚ２、およ
びドレン化した状態で更に熱交換させるドレン冷却部Ｚ
３に分かれている。In the body of the low-pressure feed water heater 3, an overheat returning section Z1 for raising the condensate by turbine extraction steam, a condensing section Z2 for exchanging the steam heat with the condensate and draining it, and a drained state. Drain cooling section Z for further heat exchange
Divided into three.
【００１５】抽気入口部32から低圧給水加熱器３に導入
された蒸気は、過熱戻し部Ｚ１で復水と熱交換し、復水
の温度上昇を行う。凝縮部Ｚ２は復水加熱面積中、最も
大きな部分で、飽和蒸気と復水との熱交換を行わせ、ド
レン冷却部Ｚ３では、凝縮部Ｚ２にて生じたドレンを給
水加熱器に入ってくる低温の復水によって飽和温度以下
に冷却し、復水と熱交換させると共に、そのドレン水位
を一定に保つことにより、蒸気がドレン出口部４を通し
て次段の加熱器に逃げるのを防いでいる。The steam introduced from the extraction inlet 32 into the low-pressure feed water heater 3 exchanges heat with the condensate in the superheat returning section Z1 to raise the temperature of the condensate. The condensing part Z2 causes heat exchange between saturated steam and condensate in the largest part of the condensate heating area, and in the drain cooling part Z3, the drain generated in the condensing part Z2 enters the feed water heater. Cooling to a saturation temperature or lower by low-temperature condensate to cause heat exchange with the condensate and keeping the drain water level constant prevents steam from escaping through the drain outlet 4 to the next-stage heater.
【００１６】次に、図８を参照して、低圧給水加熱器４
のドレンレベル制御を説明する。水位検出器９によって
検出された低圧給水加熱器４の水位信号は低圧給水加熱
器３側のドレン調節弁13を制御するため、調節計12内の
減算器40へ送られ、信号設定器41の出力信号（ＮＷＬ）
との間で減算された後、偏差信号としてＰＩＤ演算器42
へ送られる。Next, referring to FIG. 8, the low-pressure feed water heater 4
The drain level control of will be described. The water level signal of the low-pressure feed water heater 4 detected by the water level detector 9 is sent to the subtractor 40 in the controller 12 to control the drain control valve 13 on the low-pressure feed water heater 3 side, and the signal setter 41 outputs the signal. Output signal (NWL)
Is subtracted between the PID calculator 42 and the deviation signal.
Sent to.
【００１７】ＰＩＤ演算器42では偏差信号に対して演算
が行われ、出力リミッタ43で適正な出力に制限される。
また、この信号は切換器44を介してＰＩＤ演算器42に入
力され、ここで積分帰還が行われる。The PID calculator 42 calculates the deviation signal, and the output limiter 43 limits the output to an appropriate output.
Further, this signal is input to the PID calculator 42 via the switch 44, and integral feedback is performed here.
【００１８】出力リミッタ43の信号はＩ／Ｐ変換器45へ
送られて信号変換が行われ、調節弁13の開度を適正にな
るよう制御する。一方、水位検出器９によって検出され
た低圧給水加熱器４の水位信号は、復水器側のドレン調
節弁11を制御するため、調節計10内の減算器50へも送ら
れ、信号設定器51の出力信号（ＮＷＬ＋50mm）との間で
減算された後、偏差信号としてＰＩＤ演算器52へ送られ
る。The signal from the output limiter 43 is sent to the I / P converter 45 where signal conversion is performed and the opening of the control valve 13 is controlled to be appropriate. On the other hand, the water level signal of the low-pressure feed water heater 4 detected by the water level detector 9 is also sent to the subtractor 50 in the controller 10 to control the drain control valve 11 on the condenser side, and the signal setter. After being subtracted from the output signal (NWL + 50 mm) of 51, it is sent to the PID calculator 52 as a deviation signal.
【００１９】ＰＩＤ演算器52では前述した調節計12での
演算と同様に、偏差信号に対してＰＩＤ演算が行われ、
出力リミッタ53で適正な出力に制限される。また、この
信号は切換器54を介してＰＩＤ演算器52に入力され、こ
こで積分帰還が行われる。出力リミッタ53の信号はＩ／
Ｐ変換器55へ送られて信号変換を行われ、調節弁11の開
度を適正になるよう制御する。In the PID calculator 52, the PID calculation is performed on the deviation signal in the same manner as the calculation in the controller 12 described above.
The output limiter 53 limits the output to a proper value. Further, this signal is input to the PID calculator 52 via the switch 54, and integral feedback is performed here. The output limiter 53 signal is I /
The signal is sent to the P converter 55 for signal conversion, and the opening of the control valve 11 is controlled to be appropriate.
【００２０】[0020]
【発明が解決しようとする課題】上述した従来の給水加
熱器水位制御装置においては、低圧給水加熱器３の特性
上、微少な圧力差にてドレンを復水器２へと排出してい
るために、その圧力の多くは静水頭の差により生ずるも
のとなる。In the above-mentioned conventional feed water heater water level control device, the drain is discharged to the condenser 2 by a slight pressure difference due to the characteristics of the low pressure feed water heater 3. Most of the pressure is generated by the difference in hydrostatic head.
【００２１】従って、例えば冬期などに海水温度が低下
し、復水器２の器内圧力がこの海水との熱交換により高
真空（730mmHg 以上）になったと仮定すると、低圧給水
加熱器３へ流入する復水温度が低下することになる。Therefore, if it is assumed that the seawater temperature is lowered, for example, in winter, and the internal pressure of the condenser 2 becomes a high vacuum (730 mmHg or more) due to heat exchange with this seawater, then it flows into the low-pressure feed water heater 3. The condensate temperature will decrease.
【００２２】この冷たい復水を暖めるため、多量のター
ビン抽気が低圧給水加熱器３へ流入してくる。この低圧
給水加熱器３内は前述のように、過熱戻し部、凝縮部、
ドレン冷却部Ｚ１，Ｚ２，Ｚ３に分かれており、このド
レン冷却部Ｚ３ではドレンを給水加熱器外部へ排出する
ためにドレン冷却部Ｚ３に溜るドレン水位を一定に保
ち、排出ドレンがフラッシュしないようにしているが、
タービン抽気の増加に伴い、ドレン量が増加し、また低
圧給水加熱器３の器内圧力は復水温度の低下により低く
なる。In order to warm this cold condensate, a large amount of turbine extraction air flows into the low pressure feed water heater 3. As described above, the inside of the low-pressure feed water heater 3 has an overheat returning section, a condensing section,
It is divided into drain cooling sections Z1, Z2 and Z3. In this drain cooling section Z3, in order to discharge the drain to the outside of the feed water heater, the drain water level accumulated in the drain cooling section Z3 is kept constant so that the discharged drain does not flash. However,
As the turbine extraction air increases, the amount of drain increases, and the internal pressure of the low-pressure feed water heater 3 decreases due to the decrease in the condensate temperature.
【００２３】さらに、ドレン量が増加することにより、
ドレン冷却部Ｚ３での圧力損失およびドレン管18での圧
力損失が二乗比で増加する。前述したように、低圧給水
加熱器３の差圧の多くは、静水頭が大部分を占めている
ため、圧力損失を補うために低圧給水加熱器３の水位が
上昇することとなる。Further, as the amount of drain increases,
The pressure loss in the drain cooling section Z3 and the pressure loss in the drain pipe 18 increase as a square ratio. As described above, most of the differential pressure of the low-pressure feed water heater 3 is dominated by the hydrostatic head, so that the water level of the low-pressure feed water heater 3 rises to compensate for the pressure loss.
【００２４】この水位の上昇はドレン量との関係によ
り、ある所でバランスすることになるが、この時点では
水位調節弁16が全開し、ドレン水位の制御が不可解とな
り、最悪の場合はウォーターインダクションを発生する
危険性がある。The rise of the water level is balanced at a certain place due to the relation with the drain amount, but at this time, the water level control valve 16 is fully opened and the control of the drain water level becomes incomprehensible. In the worst case, the water induction is performed. There is a risk of causing.
【００２５】本発明の目的は低圧給水加熱器の水位制御
が不調に陥ったとき上流の低圧給水加熱器から流入する
ドレン量を制限して当該低圧給水加熱器の水位制御を安
定に保つようにした給水加熱器水位制御装置を提供する
ことにある。An object of the present invention is to keep the water level control of the low pressure feed water heater stable by limiting the amount of drain flowing from the upstream low pressure feed water heater when the water level control of the low pressure feed water heater fails. Another object of the present invention is to provide a feed water heater water level control device.
【００２６】[0026]
【課題を解決するための手段】本発明はドレン系統によ
って上流側給水加熱器と下流側給水加熱器とをドレン系
統で連絡させ、ドレン系統に下流側給水加熱器に流入す
るドレン量を調節する調節弁を設けると共に、ドレン系
統から独立した非常用ドレン系統に上流側給水加熱器の
ドレンを外部に逃がす非常用調節弁を設けたものにおい
て、調節弁に対する水位制御信号をプラント運転状態お
よび復水器器内圧力に基づいて制限させる手段を設けた
ことを特徴とするものである。According to the present invention, an upstream feed water heater and a downstream feed water heater are connected by a drain system through a drain system, and the drain system regulates the amount of drain flowing into the downstream feed water heater. In addition to installing a control valve, an emergency control valve that releases the drain of the upstream feed water heater to the outside in an emergency drain system that is independent of the drain system is provided. It is characterized in that means for limiting the pressure based on the internal pressure of the container is provided.
【００２７】[0027]
【作用】本発明の給水加熱器水位制御装置においては、
給水加熱器の水位の上昇に伴う低圧給水加熱器の制御不
調および蒸気タービンへドレンが逆流する等の不具合を
防止でき、安定な水位制御を得ることができる。In the feed water heater water level control device of the present invention,
It is possible to prevent malfunction of the low-pressure feed water heater due to rise of the water level of the feed water heater and backflow of the drain to the steam turbine, and to obtain stable water level control.
【００２８】[0028]
【実施例】次に、図面を参照しながら本発明の実施例を
説明する。図１において、従来と同様に水位検出器９か
らの水位信号は減算器40，50に入力され、信号設定器の
出力信号（ＮＷＬ）と信号設定器51（ＮＷＬ＋50mm）と
の間で減算され、さらにＰＩＤ演算器42，52でＰＩＤ演
算される。Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1, as in the conventional case, the water level signal from the water level detector 9 is input to the subtracters 40 and 50, and subtracted between the output signal (NWL) of the signal setting device and the signal setting device 51 (NWL + 50 mm), Further, PID calculation is performed by PID calculators 42 and 52.
【００２９】信号設定器47の出力は、発電機負荷、復水
器２の器内圧力に応じて切替える信号切替器46を介して
出力リミッタ43に入力される。すなわち、水位調節計12
側の出力リミッタ43には信号設定器47で設定される水位
調節弁13の開度を絞る指令信号が入力される。設定値を
信号設定器47の出力に切替えるタイミングを図２を参照
して説明する。発電機負荷が所定値以上で、かつ復水器
２の真空度が所定値以上である場合に信号切替器46を切
替えて信号設定器47の設定値を出力リミッタ43へ入力す
る。The output of the signal setting device 47 is input to the output limiter 43 via the signal switching device 46 which switches according to the generator load and the internal pressure of the condenser 2. That is, the water level controller 12
A command signal for narrowing the opening of the water level control valve 13 set by the signal setter 47 is input to the output limiter 43 on the side. The timing of switching the set value to the output of the signal setter 47 will be described with reference to FIG. When the generator load is equal to or higher than the predetermined value and the degree of vacuum of the condenser 2 is equal to or higher than the predetermined value, the signal switch 46 is switched to input the set value of the signal setter 47 to the output limiter 43.
【００３０】これにより、水位調節弁13は設定値により
開度が制限される。この結果、低圧給水加熱器４の水位
が徐々に上昇し、水位調節弁11が開き、ドレンがドレン
管18を通って復水器２に排出される。このように低圧給
水加熱器４のドレンの一部を復水器２に排出することに
より低圧給水加熱器３の水位上昇を防止することができ
る。As a result, the opening of the water level control valve 13 is limited by the set value. As a result, the water level of the low-pressure feed water heater 4 gradually rises, the water level control valve 11 is opened, and the drain is discharged to the condenser 2 through the drain pipe 18. By discharging a part of the drain of the low-pressure feed water heater 4 to the condenser 2 in this way, it is possible to prevent the rise of the water level in the low-pressure feed water heater 3.
【００３１】他の実施例について図３を用いて説明す
る。本実施例においても、発電機負荷、復水器２の器内
圧力に応じて信号切替器56を動作させる。出力リミッタ
53へは信号設定器57からの設定値が入力される。すなわ
ち、水位調節計10の出力は出力リミッタ53の設定値によ
り規定されて水位調節弁11の開度が制限される。Another embodiment will be described with reference to FIG. Also in this embodiment, the signal switch 56 is operated in accordance with the load of the generator and the internal pressure of the condenser 2. Output limiter
The set value from the signal setter 57 is input to 53. That is, the output of the water level controller 10 is regulated by the set value of the output limiter 53, and the opening degree of the water level control valve 11 is limited.
【００３２】通常制御から設定値への切替えタイミング
は図２と同様である。この場合、信号切替器56を動作す
ることになる。このように、低圧給水加熱器４のドレン
の一部を復水器側に切替えることによりドレンの水位上
昇を防止することができる。The switching timing from the normal control to the set value is the same as in FIG. In this case, the signal switch 56 is operated. As described above, by switching a part of the drain of the low-pressure feed water heater 4 to the condenser side, it is possible to prevent the drain water level from rising.
【００３３】さらに他の実施例について図４を用いて説
明する。水位調節弁11と並列に水位調節弁69を設ける。
開閉のタイミングは図２に示した方法を適用することが
できる。Still another embodiment will be described with reference to FIG. A water level control valve 69 is provided in parallel with the water level control valve 11.
The method shown in FIG. 2 can be applied to the opening / closing timing.
【００３４】上記構成において、水位調節弁69を開動作
させることにより低圧給水加熱器４の一部を復水器２へ
排出することによりドレンの水位上昇を防止することが
できる。In the above structure, by opening the water level control valve 69, a part of the low-pressure feed water heater 4 is discharged to the condenser 2, so that the water level rise of the drain can be prevented.
【００３５】図２に示す方法に代えて図５に示すやり方
が可能である。信号切替器46を動作条件として低圧給水
加熱器３の水位調節弁16の開度指令値が所定値以上であ
ることを加える。発電機負荷が所定値以上で、かつ復水
器２の真空度が所定値以上である条件は図２の場合と同
じである。本実施例を適用したものにおいても、図２の
実施例を適用した場合と同じように適正なタイミングで
ドレンを排出することができる。Instead of the method shown in FIG. 2, the method shown in FIG. 5 is possible. It is added that the opening degree command value of the water level control valve 16 of the low-pressure feed water heater 3 is not less than a predetermined value with the signal switch 46 as an operating condition. The condition that the generator load is equal to or higher than the predetermined value and the degree of vacuum of the condenser 2 is equal to or higher than the predetermined value is the same as the case of FIG. Even in the case of applying the present embodiment, the drain can be discharged at an appropriate timing as in the case of applying the embodiment of FIG.
【００３６】[0036]
【発明の効果】以上説明したように、本発明に係る給水
加熱器水位制御装置においては、ドレン量増加に伴う水
位制御の不調および蒸気タービンへドレンが逆流する、
いわゆるウォータインダクション等の不具合を防止する
ことができる。As described above, in the feed water heater water level control device according to the present invention, the water level control malfunctions and the drain flows back to the steam turbine as the amount of drain increases.
It is possible to prevent problems such as so-called water induction.
【図１】本発明による給水加熱器水位制御装置の実施例
を示すブロック図。FIG. 1 is a block diagram showing an embodiment of a feed water heater water level control device according to the present invention.
【図２】図１に示す信号切替器の機能を示すブロック
図。FIG. 2 is a block diagram showing the function of the signal switch shown in FIG.
【図３】本発明の他の実施例を示すブロック図。FIG. 3 is a block diagram showing another embodiment of the present invention.
【図４】本発明の他の実施例を示す系統図。FIG. 4 is a system diagram showing another embodiment of the present invention.
【図５】他の実施例に係る信号切替器の機能を示すブロ
ック図。FIG. 5 is a block diagram showing functions of a signal switch according to another embodiment.
【図６】従来の低圧給水加熱器ドレン系統を示す系統
図。FIG. 6 is a system diagram showing a conventional low pressure feed water heater drain system.
【図７】従来の低圧給水加熱器の断面図。FIG. 7 is a sectional view of a conventional low-pressure feed water heater.
【図８】従来の給水加熱器水位制御装置を示すブロック
図。FIG. 8 is a block diagram showing a conventional feed water heater water level control device.
３，４…低圧給水加熱器 11，13，16…調節弁 40，50…減算器 41，47，51，57…信号設定器 42，52…ＰＩＤ演算器 43，53…出力リミッタ 46，56…信号切替器 3, 4 ... Low-pressure feed water heater 11, 13, 16 ... Control valve 40, 50 ... Subtractor 41, 47, 51, 57 ... Signal setter 42, 52 ... PID calculator 43, 53 ... Output limiter 46, 56 ... Signal switch
Claims (2)
下流側給水加熱器とをドレン系統で連絡させ、該ドレン
系統に下流側給水加熱器に流入するドレン量を調節する
調節弁を設けると共に、前記ドレン系統から独立した非
常用ドレン系統に上流側給水加熱器のドレンを外部に逃
がす非常用調節弁を設けたものにおいて、 前記調節弁に対する水位制御信号をプラント運転状態お
よび復水器器内圧力に基づいて制限させる手段を設けた
ことを特徴とする給水加熱器水位制御装置。1. A drain system is provided for connecting the upstream side feed water heater and the downstream side feed water heater by a drain system, and the drain system is provided with a control valve for adjusting the amount of drain flowing into the downstream side feed water heater. In the one provided with an emergency control valve for releasing the drain of the upstream side feed water heater to the outside in the emergency drain system independent of the drain system, the water level control signal for the control valve is used for the plant operating state and the pressure inside the condenser. A water level controller for controlling the water level of the feed water heater, which is provided with a means for limiting the water level based on the above.
と共に前記調節弁開度に基づいて前記調節弁への水位制
御信号を制限するようにした請求項１記載の給水加熱器
水位制御装置。2. The feed water heater water level control device according to claim 1, wherein the water level control signal to the control valve is limited based on the control valve opening together with the plant operating state and the pressure inside the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31885893A JPH07174304A (en) | 1993-12-20 | 1993-12-20 | Water level controller for feed water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31885893A JPH07174304A (en) | 1993-12-20 | 1993-12-20 | Water level controller for feed water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07174304A true JPH07174304A (en) | 1995-07-14 |
Family
ID=18103744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31885893A Pending JPH07174304A (en) | 1993-12-20 | 1993-12-20 | Water level controller for feed water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07174304A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644756A (en) * | 2018-07-13 | 2018-10-12 | 中国能源建设集团陕西省电力设计院有限公司 | A kind of low-pressure heater draining system |
-
1993
- 1993-12-20 JP JP31885893A patent/JPH07174304A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644756A (en) * | 2018-07-13 | 2018-10-12 | 中国能源建设集团陕西省电力设计院有限公司 | A kind of low-pressure heater draining system |
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