JPH0655165A - Apparatus for controlling quality of water - Google Patents
Apparatus for controlling quality of waterInfo
- Publication number
- JPH0655165A JPH0655165A JP21040292A JP21040292A JPH0655165A JP H0655165 A JPH0655165 A JP H0655165A JP 21040292 A JP21040292 A JP 21040292A JP 21040292 A JP21040292 A JP 21040292A JP H0655165 A JPH0655165 A JP H0655165A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen concentration
- deaerator
- condensate
- oxygen
- water
- 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
- Degasification And Air Bubble Elimination (AREA)
- Physical Water Treatments (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
(57)【要約】
【目的】本発明は、ＣＷＴ法を適用した水質調整にあっ
てプラント負荷が低下したときの給水中における酸素濃
度の上昇を抑えて安定した水質を得ようとするものであ
る。
【構成】酸素濃度検出器(11)により検出された給水系に
おける酸素濃度及び負荷量検出手段(20)により検出され
たプラント負荷量に基づいて脱気器ベント制御手段(21)
により脱気器(6) のベント弁(6-7) の開閉制御が行われ
る。これにより、プラント負荷が低下したときのに脱気
器(6) の酸素は大気中に放出されて給水中における酸素
濃度の上昇は抑えられる。
(57) [Summary] [Object] The present invention is intended to obtain stable water quality by suppressing an increase in oxygen concentration in feed water when the plant load is reduced in water quality adjustment using the CWT method. is there. [Structure] Deaerator vent control means (21) based on the oxygen concentration in the water supply system detected by the oxygen concentration detector (11) and the plant load amount detected by the load amount detection means (20)
This controls the opening and closing of the vent valve (6-7) of the deaerator (6). As a result, when the plant load decreases, the oxygen in the deaerator (6) is released into the atmosphere and the rise in oxygen concentration in the feed water is suppressed.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば発電プラントに
おける復水供給系の水質調整装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water quality adjusting device for a condensate supply system in a power plant, for example.
【０００２】[0002]
【従来の技術】国内における火力発電所等では系統内に
おける復水、給水、ボイラ水及び蒸気の水質の調整・処
理を行って系統内の腐食を最小限とし、これとともにボ
イラ水管、蒸気管及び給水ポンプ吸込みストレーナへの
スケール付着防止を行っている。2. Description of the Related Art In a domestic thermal power plant, the water quality of condensate, water supply, boiler water and steam is adjusted and treated in the system to minimize corrosion in the system, along with it, boiler water pipe, steam pipe and Prevents scale from adhering to the suction pump of the water supply pump.
【０００３】ここで、ボイラが貫流タイプでは復水給水
系統内にアンモニア（ＮＨ3 ）及びヒドラシン（Ｎ2 Ｈ
4 ）の揮発性薬品を注入する揮発性物質処理（以下、Ａ
ＶＴ法と称する）が行われ、この処理によりＰＨ値を
「９〜９．５」とするとともに脱酸素となるように制御
している。Here, when the boiler is a once-through type, ammonia (NH 3 ) and hydracin (N 2 H) are fed into the condensate water supply system.
4 ) Treatment of volatile substances by injecting volatile chemicals (hereinafter referred to as A
(Referred to as VT method) is performed, and by this process, the PH value is set to "9 to 9.5" and deoxidation is controlled.
【０００４】しかしながら、このＡＶＴ法ではより高い
防食効果を得るために高いアンモニア濃度（ＰＨ＞９．
４）を必要とするが、これではプラント内のアンモニア
濃縮部、例えば復水気の空気冷却部においてアンモニア
による損傷（アンモニアアタック）が発生し、高濃度ア
ンモニアによる防食対策は行えない。However, in this AVT method, in order to obtain a higher anticorrosion effect, a high ammonia concentration (PH> 9.
4) is required, but with this, damage (ammonia attack) due to ammonia occurs in the ammonia concentrating part in the plant, for example, the air cooling part of the condensate, and it is not possible to take anticorrosion measures with high concentration ammonia.
【０００５】このため、ヒドラシンによる還元効果が現
れて、プラント内の炭素鋼より鉄が復水及び給水系に溶
出し、この鉄がボイラ水管、蒸気管及び給水ポンプ吸込
みストレーナ等に付着して経年的にその厚みが増加す
る。従って、この鉄を適切な時期に除去しなければなら
ず、プラント運用計画上大きな支障となる。なお、この
付着した鉄を除去しなければ、給水ポンプの過負荷運
転、ボイラチューブの亀裂を生じる虞がある。For this reason, the reducing effect of hydracin appears, iron is eluted from the carbon steel in the plant into the condensate and feed water systems, and this iron adheres to boiler water pipes, steam pipes, feed pump suction strainers, etc. Its thickness increases. Therefore, this iron must be removed at an appropriate time, which is a great obstacle to the plant operation plan. If the adhered iron is not removed, there is a possibility that the feed pump may be overloaded and the boiler tube may be cracked.
【０００６】しかるに、ＡＶＴ法の欠点を改善するため
に、近年、復水給水系へアンモニア及び酸素（Ｏ2 ）を
注入する複合中性水処理（以下、ＣＷＴ法と称する）が
行われている。このＣＷＴ法は系統内を弱アルカリと
し、かつ酸素を注入することによりボイラ水管、蒸気管
及び給水ポンプ吸込みストレーナへの鉄酸化物の付着、
持込みを大幅に低減するものである。However, in order to improve the drawbacks of the AVT method, in recent years, a complex neutral water treatment (hereinafter referred to as the CWT method) in which ammonia and oxygen (O 2 ) are injected into a condensate water supply system has been performed. . In this CWT method, the system is made weakly alkaline and oxygen is injected to deposit iron oxide on the boiler water pipe, steam pipe and feed water pump suction strainer.
It greatly reduces carry-on.
【０００７】図４はかかるＣＷＴ法を適用した水質調整
装置の構成図である。復水器１にはプラントにおけるタ
ービンの排気蒸気やヒータドレンが供給されており、こ
の復水器１はこれらタービンの排気蒸気などを冷却媒体
としての海水との間で熱交換されて復水化される。この
復水は復水ポンプ２及び復水昇圧ポンプ３の動作により
復水脱塩装置４及び低圧給水加熱器５を通って脱気器６
に送られる。このとき、復水脱塩装置４は復水中の酸化
鉄等の懸濁固形物や塩素イオン等の溶解固形物を除去し
系統再生を行っている。FIG. 4 is a block diagram of a water quality adjusting device to which the CWT method is applied. Exhaust steam of a turbine and a heater drain in the plant are supplied to the condenser 1, and the condenser 1 is heat-exchanged with sea water as a cooling medium for the exhaust steam of the turbine to be condensed. It This condensate is passed through the condensate demineralizer 4 and the low-pressure feed water heater 5 by the operation of the condensate pump 2 and the condensate booster pump 3, and the deaerator 6
Sent to. At this time, the condensate demineralizer 4 removes suspended solids such as iron oxide and dissolved solids such as chloride ions in the condensate to regenerate the system.
【０００８】脱気器６は復水に対して加熱蒸気を接触さ
せることにより復水に含まれる酸素を放出させ、この脱
気した水を給水系に送る。具体的には図５に示す構成と
なっており、脱気器６は脱気室６−１及び貯水タンク６
−２を有している。このうち脱気室６−１には脱気トレ
イ６−３、加熱蒸気の流通管６−４、復水を導入する噴
射弁６−５、酸素を大気中に放出するための放出管６−
６及びそのベント弁６−７が備えられている。このよう
な構成で、復水が噴射弁６−５により脱気室６−１内に
噴射されると、復水は脱気トレイ６−３を落下するとと
もにこのときに加熱蒸気と接触して酸素が放出される。
この酸素は脱気室６−１の上部に上昇して滞留するとと
もに、復水は貯水タンク６−２に貯えら、かつ随時給水
系に送られる。この水は給水ポンプ７の動作により高圧
給水加熱器８を通って節炭器９に送られ、さらにこの節
炭器９からボイラ１０に送られる。The deaerator 6 releases the oxygen contained in the condensate by bringing heated steam into contact with the condensate and sends the degassed water to the water supply system. Specifically, it has the configuration shown in FIG. 5, and the deaerator 6 includes a deaeration chamber 6-1 and a water storage tank 6.
-2. Of these, in the deaeration chamber 6-1, a deaeration tray 6-3, a heating steam distribution pipe 6-4, an injection valve 6-5 for introducing condensed water, and a discharge pipe 6-for discharging oxygen into the atmosphere.
6 and its vent valve 6-7. With such a configuration, when the condensate is injected into the deaeration chamber 6-1 by the injection valve 6-5, the condensate falls on the deaeration tray 6-3 and comes into contact with the heated steam at this time. Oxygen is released.
This oxygen rises and stays in the upper part of the degassing chamber 6-1, and the condensate is stored in the water storage tank 6-2 and sent to the water supply system as needed. This water is sent to the economizer 9 through the high-pressure feedwater heater 8 by the operation of the water supply pump 7, and is further sent from the economizer 9 to the boiler 10.
【０００９】ところで、かかる系統内において水質調整
は、復水系では復水脱塩装置４の出口側、給水系では脱
気器６の出口側においてそれぞれアンモニア及び酸素を
注入することにより行われる。具体的にこれらアンモニ
ア及び酸素の供給量の制御系について説明する。節炭器
９の入口側には酸素濃度計１１及び給水流量計１２が設
けられ、又、脱気器６の入口側には復水流量計１３が設
けられている。一方、復水脱塩装置４及び脱気器６の各
出口側にはそれぞれ酸素注入量検出計１４、１５が設け
られている。In the system, the water quality is adjusted by injecting ammonia and oxygen into the condensate system at the outlet side of the condensate demineralizer 4 and in the water supply system at the outlet side of the deaerator 6, respectively. A control system for the supply amounts of ammonia and oxygen will be specifically described. An oxygen concentration meter 11 and a feedwater flowmeter 12 are provided on the inlet side of the economizer 9, and a condensate flowmeter 13 is provided on the inlet side of the deaerator 6. On the other hand, oxygen injection amount detectors 14 and 15 are provided on the respective outlet sides of the condensate demineralizer 4 and the deaerator 6.
【００１０】そこで、復水系の制御系は図６に示すよう
に酸素濃度計１１により検出された酸素濃度と復水流量
計１３により検出された復水流量とを注入演算器１６に
送るとともに酸素注入量検出計１４により検出された注
入酸素量を注入演算器１６に送る。この注入演算器１６
は入力した酸素濃度、復水流量及び注入酸素量に基づい
て注入弁１７の開閉を制御して復水中の酸素濃度を所定
値に調整する。Therefore, the condensate control system sends the oxygen concentration detected by the oxygen concentration meter 11 and the condensate flow rate detected by the condensate flow meter 13 to the injection calculator 16 as shown in FIG. The injection oxygen amount detected by the injection amount detector 14 is sent to the injection calculator 16. This injection calculator 16
Controls the opening / closing of the injection valve 17 based on the input oxygen concentration, the condensate flow rate, and the injected oxygen amount to adjust the oxygen concentration in the condensate to a predetermined value.
【００１１】一方、給水系は同図に示すように酸素濃度
計１１により検出された酸素濃度と給水流量計１２によ
り検出された給水流量とを注入演算器１８に送るととも
に酸素注入量検出計１４により検出された注入酸素量を
注入演算器１８に送る。この注入演算器１８は酸素濃
度、給水流量及び注入酸素量に基づいて注入弁１９の開
閉を制御して給水中の酸素濃度を所定値に調整する。On the other hand, the water supply system sends the oxygen concentration detected by the oxygen concentration meter 11 and the water supply flow rate detected by the water supply flow meter 12 to the injection calculator 18 and the oxygen injection amount detector 14 as shown in FIG. The amount of injected oxygen detected by is sent to the injection calculator 18. The injection calculator 18 controls the opening and closing of the injection valve 19 based on the oxygen concentration, the feed water flow rate and the injected oxygen amount to adjust the oxygen concentration in the feed water to a predetermined value.
【００１２】ところで、プラントの高負荷時、脱気室６
−１の上部における酸素濃度は蒸気の上昇流と器内圧力
とにより高濃度となっている。この状態にプラント負荷
が低下すると、これに伴って器内圧力は低下し、脱気室
６−１の上部に滞留している酸素は拡散し、膨脹して脱
気トレイ６−３まで拡がる。一方、酸素は温度が低下す
るとその溶解度が高くなることは一般に知られている。By the way, when the plant is under heavy load, the deaeration chamber 6
The oxygen concentration in the upper part of -1 is high due to the upward flow of steam and the internal pressure of the vessel. When the plant load is reduced to this state, the internal pressure is reduced accordingly, and the oxygen retained in the upper part of the degassing chamber 6-1 is diffused and expanded to be expanded to the degassing tray 6-3. On the other hand, it is generally known that the solubility of oxygen increases as the temperature decreases.
【００１３】従って、プラント負荷が低下して復水の温
度が下がると、酸素は脱気トレイ６−３まで拡がって給
水に溶け込むようになる。これにより、給水は図７に示
すように酸素濃度の高いものとなり濃度のピーク値を示
すようになる。そして、このピーク値は長い場合には数
時間続く。Therefore, when the plant load decreases and the temperature of the condensate decreases, oxygen spreads to the degassing tray 6-3 and dissolves in the feed water. As a result, the water supply becomes high in oxygen concentration as shown in FIG. 7, and the concentration reaches its peak value. And if this peak value is long, it lasts for several hours.
【００１４】このため、高酸素濃度により復水供給系統
内の滞留したところにおいて腐食が発生する。従って、
高酸素濃度のピークが現れた場合、その都度、脱気器６
のベント弁６−７を手動により開いて脱気室６−１内の
酸素を大気中に放出している。そして、このベント弁６
−７を開く操作はプラント負荷の変動が多い運用では非
常に繁雑である。Therefore, due to the high oxygen concentration, corrosion occurs in the condensate supply system where it stays. Therefore,
Whenever a peak of high oxygen concentration appears, the deaerator 6
The vent valve 6-7 is manually opened to release oxygen in the deaeration chamber 6-1 to the atmosphere. And this vent valve 6
The operation to open -7 is very complicated in the operation in which the fluctuation of the plant load is large.
【００１５】[0015]
【発明が解決しようとする課題】以上のようにＣＷＴ法
を適用した装置ではプラント負荷が低下して復水の温度
が下がって場合、給水の酸素濃度は高く濃度のピーク値
を示し、その都度、脱気器６のベント弁６−７を手動に
より開いて酸素を大気中に放出しなければならない。As described above, in the apparatus to which the CWT method is applied, when the plant load decreases and the condensate temperature decreases, the oxygen concentration of the feed water shows a high peak value of the concentration, and , The vent valve 6-7 of the deaerator 6 must be manually opened to release oxygen into the atmosphere.
【００１６】そこで本発明は、ＣＷＴ法を適用した水質
調整にあってプラント負荷が低下したときの給水中にお
ける酸素濃度の上昇を抑えて安定した水質を得ることが
できる水質調整装置を提供することを目的とする。Therefore, the present invention provides a water quality adjusting device capable of obtaining stable water quality by suppressing an increase in oxygen concentration in feed water when the plant load is reduced in water quality adjustment using the CWT method. With the goal.
【００１７】[0017]
【課題を解決するための手段】本発明は、プラントにお
ける復水系にアンモニア及び酸素を注入して脱気器に供
給し、この脱気器において復水に含まれる酸素を放出し
て給水系に供給し、この後この給水系にアンモニア及び
酸素を注入する複合中性水処理による水質調整装置にお
いて、給水系における酸素濃度を検出する酸素濃度計
と、プラント負荷量を検出する負荷量検出手段と、酸素
濃度計により検出された酸素濃度及び負荷量検出手段に
より検出された負荷量に基づいて脱気器のベント弁の開
閉制御を行う脱気器ベント制御手段とを備えて上記目的
を達成しようとする水質調整装置である。According to the present invention, ammonia and oxygen are injected into a condensate system in a plant and supplied to a deaerator, and oxygen contained in the condensate is released in the deaerator to the feed system. Supply, after this, in the water quality adjusting device by the composite neutral water treatment of injecting ammonia and oxygen into the water supply system, an oxygen concentration meter for detecting the oxygen concentration in the water supply system, and a load amount detecting means for detecting the plant load amount, , A deaerator vent control means for controlling the opening and closing of the vent valve of the deaerator based on the oxygen concentration detected by the oximeter and the load amount detected by the load amount detection means will be achieved. It is a water quality adjusting device.
【００１８】[0018]
【作用】このような手段を備えたことにより、酸素濃度
計により検出された給水系における酸素濃度及び負荷量
検出手段により検出されたプラント負荷量に基づいて脱
気器ベント制御手段により脱気器のベント弁の開閉制御
が行われる。これにより、プラント負荷が低下したとき
のに脱気器の酸素は大気中に放出されて給水中における
酸素濃度の上昇が抑えられる。With the provision of such means, the deaerator is controlled by the deaerator vent control means on the basis of the oxygen concentration in the water supply system detected by the oxygen concentration meter and the plant load amount detected by the load amount detection means. Opening / closing control of the vent valve is performed. As a result, oxygen in the deaerator is released into the atmosphere when the plant load is reduced, and the increase in oxygen concentration in the feed water is suppressed.
【００１９】[0019]
【実施例】以下、本発明の第１実施例について図面を参
照して説明する。なお、図４と同一部分には同一符号を
付してその詳しい説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.
【００２０】図１はＣＷＴ法を適用した水質調整装置の
構成図である。給水系における節炭器９の入口側には酸
素濃度計１１が設けられるとともに、脱気器６の入口側
にはプラント負荷の変化に応じた復水温度を検出する復
水温度計２０が設けられている。酸素濃度計１１から出
力される酸素濃度信号は脱気器ベント制御器２１に送ら
れるとともに、復水温度計２０から出力される復水温度
信号は同脱気器ベント制御器２１に送られるようになっ
ている。FIG. 1 is a block diagram of a water quality adjusting device to which the CWT method is applied. An oxygen concentration meter 11 is provided on the inlet side of the economizer 9 in the water supply system, and a condensate thermometer 20 for detecting the condensate temperature according to changes in the plant load is provided on the inlet side of the deaerator 6. Has been. The oxygen concentration signal output from the oxygen concentration meter 11 is sent to the deaerator vent controller 21, and the condensate temperature signal output from the condensate thermometer 20 is sent to the deaerator vent controller 21. It has become.
【００２１】この脱気器ベント制御器２１は酸素濃度信
号及び復水温度信号に基づいて脱気器６のベント弁６−
７の開閉制御を行う機能を有するもので図２に示す構成
となっている。すなわち、酸素濃度計１１からの酸素濃
度信号は比較演算器２２及び変化率演算器２３に送られ
ている。このうち比較演算器２２は酸素濃度の目標設定
信号Ｓが設定され、この目標設定信号Ｓと酸素濃度信号
との偏差を求めてＰＩ演算器２４に送る機能を有してい
る。このＰＩ演算器２４は入力した偏差信号に対して酸
素濃度を目標設定値にするＰＩ（比例積分）演算を実行
してその演算結果を加算器２５に送る機能を有してい
る。又、前記変化率演算器２３には酸素濃度信号ととも
に復水温度計２０からの復水温度信号が入力し、この変
化率演算器２３はプラント負荷の変化に伴って発生する
酸素濃度及び復水温度の変化率を演算し求め、これら変
化率に応じたベント弁６−７の開閉度を演算し求める機
能を有している。加算器２５はＰＩ演算結果とベント弁
６−７の開閉度とを加算して開閉操作信号としてベント
弁６−７に送出する機能を有している。次に上記の如く
構成された装置の作用について説明する。The deaerator vent controller 21 is provided with a vent valve 6- of the deaerator 6 based on the oxygen concentration signal and the condensate temperature signal.
7 has a function of performing opening / closing control and has a configuration shown in FIG. That is, the oxygen concentration signal from the oximeter 11 is sent to the comparison calculator 22 and the change rate calculator 23. Of these, the comparison calculator 22 has a function of setting a target setting signal S of the oxygen concentration, obtaining a deviation between the target setting signal S and the oxygen concentration signal, and sending it to the PI calculator 24. The PI calculator 24 has a function of executing a PI (proportional integral) calculation for setting the oxygen concentration to a target set value on the input deviation signal and sending the calculation result to the adder 25. Further, the condensate temperature signal from the condensate thermometer 20 is input to the rate-of-change calculator 23 together with the oxygen concentration signal, and the rate-of-change calculator 23 generates the oxygen concentration and the condensate which are generated according to the change of the plant load. It has a function of calculating and obtaining the rate of change of temperature, and calculating the degree of opening / closing of the vent valve 6-7 according to these rate of change. The adder 25 has a function of adding the PI calculation result and the opening / closing degree of the vent valve 6-7 and sending the result as an opening / closing operation signal to the vent valve 6-7. Next, the operation of the apparatus configured as described above will be described.
【００２２】プラントの高負荷時、脱気室６−１の上部
における酸素濃度は蒸気の上昇流と器内圧力とにより高
濃度となっている。この状態にプラント負荷が低下する
と、これに伴って器内圧力は低下し、脱気室６−１の上
部に滞留している酸素は拡散し、膨脹して脱気トレイ６
−３まで拡がる。これとともにプラント負荷が低下して
復水の温度が下がると、酸素は脱気トレイ６−３まで拡
がって給水に溶け込み、給水は酸素濃度の高いものとな
り濃度のピーク値を示すようになる。これにより、節炭
器９の入口側における給水の酸素濃度は高くなり、酸素
濃度計１１は給水における酸素濃度を検出してその酸素
濃度信号を出力する。又、このとき復水温度計２０は脱
気器６の入口側における復水温度を検出してその復水温
度信号を出力する。When the load on the plant is high, the oxygen concentration in the upper part of the degassing chamber 6-1 is high due to the upward flow of steam and the internal pressure of the vessel. When the plant load is reduced to this state, the internal pressure is reduced accordingly, and oxygen retained in the upper portion of the degassing chamber 6-1 is diffused and expanded to expand the degassing tray 6.
Expands to -3. Along with this, when the plant load decreases and the condensate temperature decreases, oxygen spreads to the degassing tray 6-3 and dissolves in the feed water, and the feed water has a high oxygen concentration and exhibits a peak concentration value. As a result, the oxygen concentration of the feed water on the inlet side of the economizer 9 becomes high, and the oxygen concentration meter 11 detects the oxygen concentration of the feed water and outputs the oxygen concentration signal. At this time, the condensate thermometer 20 detects the condensate temperature at the inlet side of the deaerator 6 and outputs the condensate temperature signal.
【００２３】酸素濃度計１１から出力された酸素濃度信
号は比較演算器２２及び変化率演算器２３に送られ、こ
のうち比較演算器２２は酸素濃度の目標設定信号Ｓと酸
素濃度信号との偏差を求めてＰＩ演算器２４に送る。こ
のＰＩ演算器２４は入力した偏差信号に対して酸素濃度
を目標設定値にするＰＩ演算を実行してその演算結果を
加算器２５に送る。The oxygen concentration signal output from the oximeter 11 is sent to a comparison calculator 22 and a rate-of-change calculator 23, of which the comparison calculator 22 deviates between the oxygen concentration target setting signal S and the oxygen concentration signal. Is sent to the PI calculator 24. The PI calculator 24 executes a PI calculation for setting the oxygen concentration to a target set value for the input deviation signal and sends the calculation result to the adder 25.
【００２４】又、変化率演算器２３は酸素濃度信号及び
復水温度計２０からの復水温度信号を入力し、プラント
負荷の変化に伴って発生する酸素濃度及び復水温度の変
化率を演算し求め、これら変化率に応じたベント弁６−
７の開閉度を演算し求める。そして、加算器２５はＰＩ
演算結果とベント弁６−７の開閉度とを加算して開閉操
作信号としてベント弁６−７に送出する。この結果、ベ
ント弁６−７は開き、脱気室６−１に滞留している酸素
は放出管６−６を通して大気中に放出される。これによ
り、節炭器９に送られる給水の酸素濃度は所定値に調整
される。The rate-of-change calculator 23 inputs the oxygen concentration signal and the condensate temperature signal from the condensate thermometer 20 to calculate the rate of change of the oxygen concentration and the condensate temperature generated with the change of the plant load. Vent valve 6-
The open / close degree of 7 is calculated and obtained. And the adder 25 is a PI
The calculation result and the opening / closing degree of the vent valve 6-7 are added and sent to the vent valve 6-7 as an opening / closing operation signal. As a result, the vent valve 6-7 is opened, and the oxygen retained in the degassing chamber 6-1 is released into the atmosphere through the release pipe 6-6. Thereby, the oxygen concentration of the feed water sent to the economizer 9 is adjusted to a predetermined value.
【００２５】このように上記第１実施例においては、酸
素濃度計１１により検出された給水系における酸素濃度
及び復水温度計２０により検出された復水温度に基づい
て脱気器ベント制御器２１により脱気器６のベント弁６
−７の開閉制御を行う構成としたので、プラント負荷が
低下したときのに脱気器６の酸素を大気中に放出して給
水中における酸素濃度の上昇を抑えることができ、この
酸素濃度を目標酸素濃度値の適正な値に調節できる。こ
れにより、復水供給系統内の滞留したところでも腐食は
発生せず、さらにベント弁６−７をプラント負荷変化の
度に手動により開く煩雑な操作はなくなる。As described above, in the first embodiment, the deaerator vent controller 21 is based on the oxygen concentration in the water supply system detected by the oxygen concentration meter 11 and the condensate temperature detected by the condensate thermometer 20. Vent valve 6 of deaerator 6 by
Since the open / close control of -7 is performed, oxygen in the deaerator 6 can be released into the atmosphere when the plant load is reduced, and the increase in oxygen concentration in the feed water can be suppressed. The target oxygen concentration value can be adjusted to an appropriate value. As a result, corrosion does not occur even when it stays in the condensate supply system, and the complicated operation of manually opening the vent valve 6-7 each time the load on the plant changes is eliminated.
【００２６】次に本発明の第２実施例について説明す
る。同実施例は上記脱気器ベント制御器２１を変更して
図３に示す構成の脱気器ベント制御器３０としたもので
ある。すなわち、変化率演算器３１には酸素濃度信号と
ともに復水温度信号が入力し、この変化率演算器３１は
酸素濃度の上昇変化率を求めるとともに復水温度の下降
変化率を演算し求め、これら変化率に応じた酸素濃度設
定値を求める機能を有している。酸素濃度設定値は加算
器３２に送られ、この加算器３２は酸素濃度設定値に対
して定常時の酸素濃度設定値を加算し、これを目標設定
信号として比較演算器３３に送る。この比較演算器３３
は目標設定信号と酸素濃度計１１からの酸素濃度信号と
の偏差を求めてＰＩ演算器３４に送る機能を有してい
る。このＰＩ演算器３４は偏差信号に対して酸素濃度を
目標設定値にするＰＩ演算を実行してその演算結果を操
作信号としてベント弁６−７に送る機能を有している。Next, a second embodiment of the present invention will be described. In this embodiment, the deaerator vent controller 21 is modified to a deaerator vent controller 30 having the configuration shown in FIG. That is, the condensate temperature signal is input to the change rate calculator 31 together with the oxygen concentration signal, and the change rate calculator 31 calculates the increase change rate of the oxygen concentration and the decrease rate of the condensate temperature. It has a function of obtaining an oxygen concentration set value according to the rate of change. The oxygen concentration set value is sent to the adder 32, and the adder 32 adds the oxygen concentration set value in the steady state to the oxygen concentration set value and sends it to the comparison calculator 33 as a target set signal. This comparison calculator 33
Has a function of obtaining the deviation between the target setting signal and the oxygen concentration signal from the oximeter 11 and sending it to the PI calculator 34. The PI calculator 34 has a function of executing a PI calculation for setting the oxygen concentration to a target set value for the deviation signal and sending the calculation result as an operation signal to the vent valve 6-7.
【００２７】かかる構成であれば、プラント負荷が高負
荷から低下した場合、上記の如く給水は酸素濃度の高い
ものとなり濃度のピーク値を示すようになる。この状態
に変化率演算器３１は酸素濃度信号及び復水温度信号を
入力して酸素濃度の上昇変化率を求めるとともに復水温
度の下降変化率を演算し求め、これら変化率に応じた酸
素濃度設定値を求める。この酸素濃度設定値は加算器３
２に送られ、この加算器３２は酸素濃度設定値に対して
定常時の酸素濃度設定値を加算し、これを目標設定信号
として比較演算器３３に送る。この比較演算器３３は目
標設定信号と酸素濃度計１１からの酸素濃度信号との偏
差を求めてＰＩ演算器３４に送る。このＰＩ演算器３４
は偏差信号に対して酸素濃度を目標設定値にするＰＩ演
算を実行してその演算結果を操作信号としてベント弁６
−７に送る。この結果、ベント弁６−７は開いて脱気室
６−１に滞留している酸素は放出管６−６を通して大気
中に放出される。これにより、節炭器９に送られる給水
の酸素濃度は所定値に調整される。このように上記第２
実施例においても上記第１実施例と同様の効果を奏する
ことができる。With such a configuration, when the plant load is reduced from a high load, the feed water has a high oxygen concentration as described above and exhibits a peak concentration value. In this state, the rate-of-change calculator 31 inputs the oxygen concentration signal and the condensate temperature signal to obtain the rate of increase in the oxygen concentration and the rate of decrease in the condensate temperature to obtain the oxygen concentration according to these rates of change. Calculate the set value. This oxygen concentration setting value is added to
2, the adder 32 adds the steady-state oxygen concentration set value to the oxygen concentration set value, and sends it to the comparison calculator 33 as a target set signal. The comparison calculator 33 calculates the deviation between the target setting signal and the oxygen concentration signal from the oximeter 11 and sends it to the PI calculator 34. This PI calculator 34
Executes the PI calculation for setting the oxygen concentration to the target set value for the deviation signal and uses the calculation result as the operation signal for the vent valve 6
Send to -7. As a result, the vent valve 6-7 is opened and the oxygen retained in the deaeration chamber 6-1 is released into the atmosphere through the release pipe 6-6. Thereby, the oxygen concentration of the feed water sent to the economizer 9 is adjusted to a predetermined value. In this way the second
Also in the embodiment, the same effect as the first embodiment can be obtained.
【００２８】なお、本発明は上記各実施例に限定される
ものでなくその要旨を変更しない範囲で変形してもよ
い。例えば、変化率演算器２３、３１に入力する復水温
度に代えてプラント負荷量を表す信号を入力するように
してもよい。又、節炭器９の入口側に設けられた酸素濃
時計１１は脱気器６の出口側又は脱気器６の貯水タンク
６−２に設けてもよい。The present invention is not limited to the above embodiments, and may be modified within the scope of the invention. For example, a signal representing the plant load amount may be input instead of the condensate temperature input to the change rate calculators 23 and 31. Further, the oxygen rich timepiece 11 provided on the inlet side of the economizer 9 may be provided on the outlet side of the deaerator 6 or the water storage tank 6-2 of the deaerator 6.
【００２９】[0029]
【発明の効果】以上詳記したように本発明によれば、Ｃ
ＷＴ法を適用した水質調整にあってプラント負荷が低下
したときの給水中における酸素濃度の上昇を抑えて安定
した水質を得ることができる水質調整装置を提供でき
る。As described above in detail, according to the present invention, C
It is possible to provide a water quality adjusting device that can suppress the increase in oxygen concentration in the feed water when the plant load is reduced in the water quality adjustment applying the WT method and obtain stable water quality.
【図１】本発明に係わる水質調整装置の第１実施例を示
す構成図。FIG. 1 is a configuration diagram showing a first embodiment of a water quality adjusting device according to the present invention.
【図２】同装置における脱気器ベント制御器の具体的な
構成図。FIG. 2 is a specific configuration diagram of a deaerator vent controller in the same device.
【図３】本発明に係わる水質調整装置の第２実施例にお
ける脱気器ベント制御器の具体的な構成図。FIG. 3 is a specific configuration diagram of a deaerator vent controller in a second embodiment of the water quality adjusting device according to the present invention.
【図４】従来装置の構成図。FIG. 4 is a block diagram of a conventional device.
【図５】同装置における脱気器の具体的な構成図。FIG. 5 is a specific configuration diagram of a deaerator in the same device.
【図６】同装置における水質調整の制御系の構成図。FIG. 6 is a block diagram of a control system for water quality adjustment in the device.
【図７】プラント負荷変化に対する酸素濃度の挙動を示
す図。FIG. 7 is a diagram showing the behavior of oxygen concentration with respect to changes in plant load.
１…復水器、２…復水ポンプ、３…復水昇圧ポンプ、４
…復水脱塩装置、５…低圧給水加熱器、６…脱気器、６
−１…脱気室、６−２…貯水タンク、６−７…ベント
弁、７…給水ポンプ、８…高圧給水加熱器、９…節炭
器、１０…ボイラ、１１…酸素濃度計、２０…復水温度
計、２１…脱気器ベント制御器、２２，３３…比較演算
器、２３，３１…変化率演算器、２４，３４…ＰＩ演算
器、２５，３２…加算器。1 ... Condenser, 2 ... Condensate pump, 3 ... Condensate booster pump, 4
... Condensate demineralizer, 5 ... Low-pressure feed water heater, 6 ... Deaerator, 6
-1 ... Deaeration chamber, 6-2 ... Water storage tank, 6-7 ... Vent valve, 7 ... Water supply pump, 8 ... High pressure feed water heater, 9 ... Economizer, 10 ... Boiler, 11 ... Oxygen concentration meter, 20 ... Condensate thermometer, 21 ... Deaerator vent controller, 22, 33 ... Comparison calculator, 23, 31 ... Change rate calculator, 24, 34 ... PI calculator, 25, 32 ... Adder.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 次信 愛知県知多市北浜町10番地１ 中部電力株 式会社知多第二火力発電所内 (72)発明者 小櫃 繁雄 愛知県知多市北浜町10番地１ 中部電力株 式会社知多第二火力発電所内 (72)発明者 櫻木 昭文 愛知県知多市北浜町10番地１ 中部電力株 式会社知多第二火力発電所内 (72)発明者 高橋 晃 神奈川県横浜市鶴見区末広町２丁目４番地 株式会社東芝京浜事業所内 (72)発明者 雨宮 秀 神奈川県横浜市鶴見区末広町２丁目４番地 株式会社東芝京浜事業所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsugunobu Kato 1-10 Kitahama-cho, Chita-shi, Aichi Chubu Electric Power Company Chita Daini Thermal Power Station (72) Inventor Shigeo Obitsu 10 Kitahama-cho, Chita-shi, Aichi 1 Chubu Electric Power Company Chita Daini Thermal Power Station (72) Inventor Akifumi Sakuragi 10 Kitahama-cho, Chita City, Aichi Prefecture 1 Chubu Electric Power Company Chita Daini Thermal Power Station (72) Inventor Akira Takahashi Yokohama, Kanagawa Prefecture 2-4 Suehirocho, Tsurumi-ku, Toshiba Keihin Plant, Inc. (72) Inventor Hide Amamiya 2-4, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa Toshiba Keihin Plant, Ltd.
Claims (1)
び酸素を注入して脱気器に供給し、この脱気器において
復水に含まれる酸素を放出して給水系に供給し、この後
この給水系にアンモニア及び酸素を注入する複合中性水
処理による水質調整装置において、前記給水系における
酸素濃度を検出する酸素濃度計と、前記プラント負荷量
を検出する負荷量検出手段と、前記酸素濃度計により検
出された酸素濃度及び負荷量検出手段により検出された
負荷量に基づいて前記脱気器のベント弁の開閉制御を行
う脱気器ベント制御手段とを具備したことを特徴とする
水質調整装置。1. Ammonia and oxygen are injected into a condensate system in a plant and supplied to a deaerator, and oxygen contained in condensate is released in the deaerator and supplied to a water supply system, and then this water supply system. In the water quality adjusting device by the mixed neutral water treatment of injecting ammonia and oxygen into, the oxygen concentration meter to detect the oxygen concentration in the water supply system, load amount detection means to detect the plant load amount, by the oxygen concentration meter A deaerator vent control means for controlling the opening / closing of a vent valve of the deaerator based on the detected oxygen concentration and the load detected by the load detecting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21040292A JP3199851B2 (en) | 1992-08-06 | 1992-08-06 | Water quality adjustment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21040292A JP3199851B2 (en) | 1992-08-06 | 1992-08-06 | Water quality adjustment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0655165A true JPH0655165A (en) | 1994-03-01 |
| JP3199851B2 JP3199851B2 (en) | 2001-08-20 |
Family
ID=16588726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21040292A Expired - Lifetime JP3199851B2 (en) | 1992-08-06 | 1992-08-06 | Water quality adjustment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3199851B2 (en) |
-
1992
- 1992-08-06 JP JP21040292A patent/JP3199851B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3199851B2 (en) | 2001-08-20 |
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