JPH08121708A - Water spray controlling device of reheat steam system temperature decreasing device - Google Patents
Water spray controlling device of reheat steam system temperature decreasing deviceInfo
- Publication number
- JPH08121708A JPH08121708A JP26038494A JP26038494A JPH08121708A JP H08121708 A JPH08121708 A JP H08121708A JP 26038494 A JP26038494 A JP 26038494A JP 26038494 A JP26038494 A JP 26038494A JP H08121708 A JPH08121708 A JP H08121708A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- temperature
- desuperheater
- reheat steam
- switching
- 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
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ボイラの再熱器におい
て、水をスプレーすることにより再熱蒸気温度を制御す
る再熱蒸気系減温器の注水制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water injection control device for a reheat steam desuperheater which controls the reheat steam temperature by spraying water in a boiler reheater.
【０００２】[0002]
【従来の技術】近年、原子力発電設備による電力の安定
供給により、ボイラの運用形態は中間負荷火力的運用が
増加し、これに伴い、負荷変化についても、負荷変化率
および負荷変化幅の両者とも大きく、かつ、高頻度負荷
変化の形態が一般化してきている。このようなボイラの
運用形態において、再熱蒸気温度は、プラントの高効率
運転を考慮して広範な負荷範囲について所定の管理値に
なるように制御されている。2. Description of the Related Art In recent years, the stable supply of electric power from nuclear power generation facilities has led to an increase in the intermediate load thermal power plant operation mode. Along with this, both the load change rate and the load change range have increased. The form of large and frequent load changes is becoming common. In such a boiler operation mode, the reheat steam temperature is controlled to be a predetermined control value over a wide load range in consideration of high-efficiency operation of the plant.
【０００３】このための制御として、節炭器出口の排ガ
スを炉底から再循環させる量を制御することにより伝熱
管の対流伝熱係数を増減させる手段、および応答遅れを
カバーするために水をスプレーして再熱蒸気温度を管理
値に近付ける手段が採用されている。これらの手段を図
６〜図１１を参照して説明する。As control for this purpose, means for increasing or decreasing the convective heat transfer coefficient of the heat transfer tube by controlling the amount of the exhaust gas at the outlet of the economizer which is recirculated from the furnace bottom, and water for covering the response delay A means of spraying to bring the reheat steam temperature close to the control value is adopted. These means will be described with reference to FIGS.
【０００４】図６はボイラ構成の概要を示す図である。
この図で、１はボイラ、２はボイラ１の火炉を構成する
火炉水壁管、３は風箱、４はバーナ、５は火炎を示す。
６は高温過熱器、７は高温再熱器、８は低温再熱器、９
は低温過熱器、１０は節炭器であり、これらは火炉内の
上流から下流に順次配置されている。１１は空気予熱
器、１２は節炭器１０からの排ガスを導出する煙道、１
３は空気を風箱３に導入する風道である。１４は節炭器
１０からの排ガスを火炉のホッパに導入するガス再循環
ファン、１５は当該排ガスの導入量を制御する再循環ガ
ス制御ダンパ、１６は当該排ガスに混合する空気の量を
制御する混合ガス量制御ダンパ、１７はホッパに導入さ
れる再循環ガス量を制御する火炉ホッパダンパである。
再循環ガス制御ダンパ１５、混合ガス量制御ダンパ１
６、および火炉ホッパダンパ１７によって再循環ガス量
を制御することにより、高温再熱器７の出口の蒸気温度
を所定値に制御するようになっている。FIG. 6 is a diagram showing an outline of a boiler configuration.
In this figure, 1 is a boiler, 2 is a furnace water wall tube which constitutes the furnace of the boiler 1, 3 is a wind box, 4 is a burner, and 5 is a flame.
6 is a high temperature superheater, 7 is a high temperature reheater, 8 is a low temperature reheater, 9
Is a low-temperature superheater, 10 is a economizer, and these are sequentially arranged in the furnace from upstream to downstream. Reference numeral 11 is an air preheater, 12 is a flue for discharging the exhaust gas from the economizer 10, 1
Reference numeral 3 is an air passage for introducing air into the wind box 3. 14 is a gas recirculation fan that introduces the exhaust gas from the economizer 10 into the hopper of the furnace, 15 is a recirculation gas control damper that controls the introduction amount of the exhaust gas, and 16 is the amount of air mixed with the exhaust gas. The mixed gas amount control damper 17, 17 is a furnace hopper damper for controlling the amount of recirculated gas introduced into the hopper.
Recirculation gas control damper 15, mixed gas amount control damper 1
6 and the furnace hopper damper 17 are used to control the amount of recirculated gas, so that the steam temperature at the outlet of the high temperature reheater 7 is controlled to a predetermined value.
【０００５】図７はボイラの水−蒸気系の系統図であ
る。この図で、図６に示す部分と同一又は等価な部分に
は同一符号を付して説明を省略する。又、実線は水系
統、破線は蒸気系統を示す。２０は高圧タービンであ
り、高温過熱器６からの蒸気が高温過熱蒸気管２１、主
蒸気塞止弁２２を経て供給され、排出された蒸気は逆止
弁２３を介して低温再熱器８に導入される。２４は中圧
タービンであり、高温再熱器７からの蒸気が高温再熱蒸
気管２５、高温再熱蒸気塞止弁２６を経て供給され、こ
こから排出された蒸気はさらに各低圧タービン２７に導
入される。FIG. 7 is a system diagram of a water-steam system of a boiler. In this figure, the same or equivalent parts as those shown in FIG. The solid line shows the water system and the broken line shows the steam system. Reference numeral 20 denotes a high-pressure turbine, the steam from the high-temperature superheater 6 is supplied via a high-temperature superheated steam pipe 21 and a main steam stop valve 22, and the discharged steam is passed to a low-temperature reheater 8 via a check valve 23. be introduced. Reference numeral 24 denotes an intermediate pressure turbine, the steam from the high temperature reheater 7 is supplied through a high temperature reheat steam pipe 25 and a high temperature reheat steam stop valve 26, and the steam discharged from this is further supplied to each low pressure turbine 27. be introduced.
【０００６】２８は低圧タービン２７から排出される蒸
気を復水する復水器、２９は低圧復水ポンプ、３０は脱
塩装置、３１は低圧給水加熱器、３２は脱気器、３３は
脱気器ストレージ、３４は給水ポンプ、３５は高圧給水
加熱器、３６は給水流量計、３７は高圧給水加熱器３５
から分岐するスプレー配管である。４０は低温過熱器９
の出口蒸気管に設けられた減温器であり、スプレー配管
３７から過熱器スプレー遮断弁４１、過熱器スプレー流
量調整弁４２を介してスプレー水が供給される。４３は
低温再熱器８の出口蒸気管に設けられた減温器であり、
スプレー配管３７から再熱器スプレー遮断弁４４、再熱
器スプレー流量調整弁４５を介してスプレー水が供給さ
れる。28 is a condenser for condensing steam discharged from the low-pressure turbine 27, 29 is a low-pressure condensate pump, 30 is a demineralizer, 31 is a low-pressure feed water heater, 32 is a deaerator, and 33 is a deaerator. Air storage, 34 is a water supply pump, 35 is a high-pressure water heater, 36 is a water flow meter, and 37 is a high-pressure water heater 35.
It is a spray pipe branched from. 40 is a low temperature superheater 9
The spray water is supplied from the spray pipe 37 through the superheater spray cutoff valve 41 and the superheater spray flow rate adjusting valve 42. 43 is a desuperheater provided in the outlet steam pipe of the low temperature reheater 8,
Spray water is supplied from the spray pipe 37 through a reheater spray shutoff valve 44 and a reheater spray flow rate adjusting valve 45.
【０００７】図８は図７に示す再熱器スプレー流量調整
弁４５を制御する注水制御装置のブロック図である。こ
の図で、５１は発電機出力指令値、５２は再熱蒸気温度
測定信号を示す。５３は関数発生器であり、発電機出力
指令値をこれに対応する再熱蒸気温度に変換する。５
４、５５は信号発生器、５６は信号発生器５４と信号発
生器５５のいずれかを切り換え選択する信号切換器であ
る。FIG. 8 is a block diagram of a water injection controller for controlling the reheater spray flow rate adjusting valve 45 shown in FIG. In this figure, 51 is a generator output command value, and 52 is a reheat steam temperature measurement signal. Reference numeral 53 is a function generator, which converts the generator output command value into a corresponding reheated steam temperature. 5
Reference numerals 4 and 55 are signal generators, and reference numeral 56 is a signal switcher for switching and selecting one of the signal generator 54 and the signal generator 55.
【０００８】信号発生器５４にはスプレーを阻止するた
めに関数発生器５３から出力される再熱蒸気温度を高い
値に設定する温度が設定されており、信号発生器５５に
はスプレーを可能とするために関数発生器５３から出力
される再熱蒸気温度を低い値に設定する温度が設定され
ている。５７は関数発生器５３の出力と信号切換器５６
で切り換えられた信号発生器の出力とを加算する加算
器、５８は加算器５７の出力と再熱蒸気温度測定信号５
２との偏差を演算する減算器、５９は比例積分器であ
る。The signal generator 54 is set to a temperature for setting the reheat steam temperature output from the function generator 53 to a high value in order to prevent spraying, and the signal generator 55 is enabled to spray. In order to do so, the temperature for setting the reheat steam temperature output from the function generator 53 to a low value is set. 57 is the output of the function generator 53 and the signal switch 56.
An adder for adding the output of the signal generator switched by the switch 58, the output 58 of the adder 57 and the reheat steam temperature measurement signal 5
A subtracter for calculating the deviation from 2 and a proportional integrator 59.
【０００９】６０は信号切換器、６１は関数発生器、６
３は自動・手動切換器を示す。関数発生器６１は、さき
に示した発電機出力指令値５１に応じた再熱蒸気温度を
作成して出力する。信号切換器６０は比例積分器５９と
関数発生器６１の切り換えを行う。Reference numeral 60 is a signal switcher, 61 is a function generator, and 6
Reference numeral 3 indicates an automatic / manual switch. The function generator 61 creates and outputs the reheat steam temperature according to the generator output command value 51 shown above. The signal switcher 60 switches between the proportional integrator 59 and the function generator 61.
【００１０】上記の構成において、信号切換器５６は、
常時信号発生器５４を加算器５７に接続し、信号Ａ1 が
入力されたとき信号発生器５５を加算器５７に接続す
る。又、信号切換器６０は、常時比例積分器５９を自動
・手動切換器６３に接続し、信号Ｂ1 が入力されたとき
関数発生器６１を自動・手動切換器６３に接続する。上
記各信号Ａ1 、Ｂ1 の発生条件、即ち、各信号切換器５
６、６０の切換条件を図９および図１０に示す。In the above structure, the signal switch 56 is
The signal generator 54 is always connected to the adder 57, and the signal generator 55 is connected to the adder 57 when the signal A 1 is input. Further, the signal switching device 60 always connects the proportional integrator 59 to the automatic / manual switching device 63, and connects the function generator 61 to the automatic / manual switching device 63 when the signal B 1 is input. Conditions for generating the signals A 1 and B 1 , that is, the signal switching devices 5
Switching conditions of Nos. 6 and 60 are shown in FIGS. 9 and 10.
【００１１】図９は信号切換器５６の切換条件を示す図
である。この図で、ＡＮＤは論理積を示す記号である。
信号Ａ1 は、「負荷がある所定値ａ以上」であり、か
つ、「火炉ホッパダンパが下限動作にある（これ以上再
循環ガス制御による蒸気温度下降が望めない状態）」と
き出力される。FIG. 9 is a diagram showing switching conditions of the signal switch 56. In this figure, AND is a symbol indicating a logical product.
The signal A 1 is output when "the load is equal to or greater than a predetermined value a" and "the furnace hopper damper is in the lower limit operation (a state in which the steam temperature cannot be further lowered by the recirculation gas control)".
【００１２】図１０は信号切換器６０の切換条件を示す
図である。この図で、ＡＮＤは図９に示すものと同じ論
理積を示す記号である。信号Ｂ1 は、「起動期間経過
（ボイラ起動時でない）」、「負荷上昇中」、「再熱蒸
気温度上昇率がある所定値ｄ以上」、「再熱蒸気温度偏
差がある所定値ｅ以上」の各条件が全て満たされた状態
にあるとき出力される。図９および図１０に示す各条件
はボイラ制御の過程ににおいて得られる条件である。FIG. 10 is a diagram showing switching conditions of the signal switch 60. In this figure, AND is a symbol indicating the same logical product as that shown in FIG. Signal B 1 is “starting period has elapsed (not during boiler startup)”, “load is increasing”, “reheat steam temperature increase rate is above a predetermined value d”, “reheat steam temperature deviation is above a predetermined value e” It is output when all the conditions of "are satisfied. The conditions shown in FIG. 9 and FIG. 10 are conditions obtained in the process of boiler control.
【００１３】図８に示す注水制御装置において、通常の
状態（再循環ガス制御により再熱器蒸気温度が制御され
ている状態）では、信号切換器５６は信号発生器５４側
を選択しているので、加算器５７において高い設定温度
が関数発生器５３の出力に加算され、減算器５８で得ら
れる偏差は小さくなり、再熱器スプレー流量調整弁４５
を作動させるには到らず、減温器４３によるスプレーは
行われない。しかし、図９に示す条件が発生すると、信
号Ａ1 が出力されて信号切換器５６が信号発生器５５側
へ切り換えられ、加算器５７には低い設定温度が入力さ
れるので、減算器５８の出力は大きくなり、これに応じ
て再熱器スプレー流量調整弁４５が作動して減温器４３
によるスプレーが行われ、再熱蒸気温度が調整される。In the water injection control device shown in FIG. 8, in the normal state (the state in which the reheater vapor temperature is controlled by the recirculation gas control), the signal switch 56 selects the signal generator 54 side. Therefore, the high set temperature is added to the output of the function generator 53 in the adder 57, the deviation obtained in the subtractor 58 becomes small, and the reheater spray flow rate adjusting valve 45
Therefore, the spray by the desuperheater 43 is not performed. However, when the condition shown in FIG. 9 occurs, the signal A 1 is output, the signal switch 56 is switched to the signal generator 55 side, and the low set temperature is input to the adder 57, so that the subtracter 58 The output is increased, and accordingly, the reheater spray flow rate adjusting valve 45 is activated to operate the desuperheater 43.
Is sprayed and the reheat steam temperature is adjusted.
【００１４】又、図１０に示す条件（特に再熱蒸気温度
の上昇率と偏差が極めて大きい場合）が発生すると、信
号Ｂ1 が出力されて信号切換器６０が比例積分器５９か
ら関数発生器６１に切り換えられ、関数発生器６１の特
性に従って先行的に再熱器スプレー流量調整弁４５が作
動して減温器４３によるスプレーが行われる。When the condition shown in FIG. 10 (especially when the rate of rise of the reheated steam temperature and the deviation are extremely large) occurs, the signal B 1 is output and the signal switcher 60 causes the proportional integrator 59 to output the function generator. 61, the reheater spray flow rate adjusting valve 45 is operated in advance according to the characteristics of the function generator 61, and spraying is performed by the desuperheater 43.
【００１５】[0015]
【発明が解決しようとする課題】上記従来装置において
は、スプレーは専ら再熱蒸気温度を極力一定に保持する
ために用いられ、これに沿ってその制御が行なわれてい
た。ところで、前述のように、近年、ボイラの運用形態
が、高負荷変化率、広い負荷変化幅、高頻度の負荷変化
となってきているため、間欠的なスプレーが繰り返し行
われるようになった。このようなスプレーは好ましくな
い問題を生じる。これを図１１を参照して説明する。In the above-mentioned conventional apparatus, the spray is used exclusively for keeping the reheat steam temperature as constant as possible, and the control is performed along this. By the way, as described above, in recent years, since the operation mode of the boiler has become a high load change rate, a wide load change range, and a high frequency load change, intermittent spraying has been repeated. Such sprays give rise to undesirable problems. This will be described with reference to FIG.
【００１６】図１１は図７に示す減温器４３の一部断面
図である。この図で、図７に示す部分と同一部分には同
一符号が付してある。４６は注水逆止弁（図７には示さ
れていない）である。減温器４３は、低温再熱蒸気管８
０に介在せしめられ、ノズル４３１、インレットノズル
４３２、スプレーノズル４３３、サーマルスリーブ４３
４で構成されている。低温再熱蒸気管８０を通過する蒸
気温度が所定の温度を超え、前述の条件が揃うと上記注
水制御装置が作動し、これに応じて再熱器スプレー流量
調整弁４５が調整され、当該蒸気にスプレー水配管３７
を通って供給される水をスプレーノズル４３３からスプ
レーして再熱蒸気温度を低下させる。FIG. 11 is a partial sectional view of the temperature reducer 43 shown in FIG. In this figure, the same parts as those shown in FIG. 7 are designated by the same reference numerals. 46 is a water injection check valve (not shown in FIG. 7). The desuperheater 43 is a low temperature reheat steam pipe 8
No. 431, an inlet nozzle 432, a spray nozzle 433, a thermal sleeve 43.
It is composed of four. When the temperature of the steam passing through the low-temperature reheat steam pipe 80 exceeds a predetermined temperature and the above-mentioned conditions are satisfied, the water injection control device is operated, and the reheater spray flow rate adjusting valve 45 is adjusted in accordance therewith, and the steam Spray water pipe 37
The water supplied therethrough is sprayed from the spray nozzle 433 to lower the reheat steam temperature.
【００１７】このようなスプレー動作において、スプレ
ー実施前においては、低温再熱蒸気管８０や減温器４３
のサーマルスリーブ４３４の表面、内面はともに高温状
態にあるが、一旦スプレーが開始されるとそれらの内面
の温度が低下し表面のみ高温状態が保持される。ここ
で、低温再熱蒸気管８０は大きな肉厚を有し、又、減温
器４３のサーマルスリーブ４３４も相応の肉厚を有する
ので、表面と内面との間に相当な温度差が生じ、スプレ
ーの繰り返しによりそれらに大きな熱応力が生じ、これ
が累積すると遂にはそれらに熱疲労による割れ（損傷）
が発生する。In such a spraying operation, before the spraying is performed, the low temperature reheat steam pipe 80 and the desuperheater 43 are used.
Both the surface and the inner surface of the thermal sleeve 434 are in a high temperature state, but once the spraying is started, the temperature of the inner surface is lowered and only the surface is kept in a high temperature state. Here, since the low temperature reheat steam pipe 80 has a large wall thickness and the thermal sleeve 434 of the desuperheater 43 also has a corresponding wall thickness, a considerable temperature difference occurs between the surface and the inner surface. Repeated spraying creates large thermal stresses on them, which, when accumulated, will eventually crack (damage) them due to thermal fatigue.
Occurs.
【００１８】本発明の目的は、上記従来技術における課
題を解決し、スプレーを抑制することができ、ひいては
低温再熱蒸気管や減温器の熱疲労による損傷を防止する
ことができる再熱蒸気系減温器の注水制御装置を提供す
ることにある。An object of the present invention is to solve the above-mentioned problems in the prior art, to suppress spraying, and thus to prevent reheat steam of a low temperature reheat steam pipe or a desuperheater from being damaged by thermal fatigue. It is to provide a water injection control device for a system desuperheater.
【００１９】[0019]
【課題を解決するための手段】上記の目的を達成するた
め、ボイラの炉底から炉内に再循環させる排ガス量をダ
ンパの開度で制御する排ガス再循環制御手段と、再熱蒸
気配管に介在して注水を行う減温器を非作動とする温度
が設定されこの温度に応じた信号を出力する第１の信号
発生手段と、前記減温器を作動させる温度が設定されこ
の温度に応じた信号を出力する第２の信号発生手段と、
前記排ガス再循環制御手段が下限動作状態にあり、か
つ、前記ボイラの負荷信号が所定値以上であることを条
件として前記第１の信号発生手段の出力信号を前記第２
の信号発生手段の出力信号に切り換える切換手段と、負
荷要求信号に応じた再熱蒸気温度に前記切換手段で切り
換えられた信号を加算する加算手段と、この加算手段の
信号と再熱蒸気温度の測定信号との偏差を演算する演算
手段と、前記偏差に応じて開度が調整される前記減温器
の調整弁とを備えた再熱蒸気系減温器の注水制御装置に
おいて、特許請求の範囲の第１の発明は、前記切換手段
の前記条件に、負荷要求信号と前記負荷信号との差が所
定値以上であることを付加したことを特徴とする。又、
第２の発明は、前記切換手段の前記条件に、前記下限動
作状態が所定時間継続することを付加したことを特徴と
する。又、第３の発明は、前記調整弁が閉じ方向に動作
しているとき前記偏差の変化率を制限する変化率制限手
段を設けたことを特徴とする。又、第４の発明は、前記
偏差および再熱蒸気温度上昇率がそれぞれ所定値以上で
あり、かつ、負荷要求信号と前記負荷信号との差が所定
値以上であることを条件として先行的に蒸気調整弁を開
動作させる先行注水手段を設けたことを特徴とする。さ
らに、第５の発明は、前記切換手段の前記条件に負荷要
求信号と前記負荷信号との差が所定値以上であることを
付加する手段、前記切換手段の前記条件に前記下限動作
状態が所定時間継続することを付加する手段、前記調整
弁が閉じ方向に動作しているとき前記偏差の変化率を制
限する変化率制限手段、および前記偏差および再熱蒸気
温度がそれぞれ所定値以上であり、かつ、負荷要求信号
と前記負荷信号との差が所定値以上であることを条件と
して先行的に蒸気調整弁を開動作させる先行注水手段の
うちの少なくとも２つを設けたことを特徴とする。In order to achieve the above object, the exhaust gas recirculation control means for controlling the amount of exhaust gas recirculated from the furnace bottom of the boiler to the furnace by the opening degree of the damper, and the reheat steam pipe are provided. A first signal generating means for setting a temperature at which the desuperheater intervening water injection is deactivated and outputting a signal according to this temperature, and a temperature for operating the desuperheater are set according to this temperature. Second signal generating means for outputting the output signal,
The output signal of the first signal generating means is set to the second signal on the condition that the exhaust gas recirculation control means is in the lower limit operation state and the load signal of the boiler is a predetermined value or more.
Switching means for switching to the output signal of the signal generating means, adding means for adding the signal switched by the switching means to the reheat steam temperature according to the load request signal, and the signal of this adding means and the reheat steam temperature. In a water injection control device for a reheat steam desuperheater, which comprises a calculating means for calculating a deviation from a measurement signal, and an adjusting valve for the desuperheater whose opening degree is adjusted according to the deviation, A first invention of the range is characterized in that the condition of the switching means is added to the condition that the difference between the load request signal and the load signal is a predetermined value or more. or,
A second aspect of the invention is characterized in that the lower limit operation state is continued for a predetermined time to the condition of the switching means. A third aspect of the invention is characterized in that change rate limiting means is provided for limiting the change rate of the deviation when the adjusting valve is operating in the closing direction. Further, a fourth aspect of the invention is a condition that the deviation and the reheat steam temperature increase rate are each a predetermined value or more, and the difference between the load request signal and the load signal is a predetermined value or more. It is characterized in that a preceding water injection means for opening the steam regulating valve is provided. Further, a fifth aspect of the invention is a means for adding to the condition of the switching means that the difference between the load request signal and the load signal is a predetermined value or more, and the lower limit operation state is predetermined for the condition of the switching means. Means for adding continuation for a time, change rate limiting means for limiting the change rate of the deviation when the regulating valve is operating in the closing direction, and the deviation and the reheated steam temperature are each a predetermined value or more, In addition, at least two of the preceding water injection means for opening the steam regulating valve in advance are provided on condition that the difference between the load request signal and the load signal is equal to or greater than a predetermined value.
【００２０】[0020]
【作用】第１の発明では、切換手段の条件に、負荷要求
信号と現在の負荷信号との差が所定値以上であることを
付加し、これにより注水を抑える。第２の発明では、切
換手段の条件に、下限動作状態（再循環ガス制御による
蒸気温度下降が望めない状態）が所定時間継続すること
を付加し、これにより、所定時間内に下限動作状態がな
くなったときには、再循環ガスにより蒸気温度を制御
し、注水を抑える。第３の発明では、変化率制限手段に
より、調整弁が閉じ方向に動作しているとき偏差の変化
率を制限し、連続して繰り返される注水の繰り返しを抑
える。第４の発明では、先行注水手段により、偏差およ
び再熱蒸気温度がそれぞれ所定値以上であるばかりでな
く、さらに、負荷要求信号と前記負荷信号との差が所定
値以上になって初めて蒸気調整弁を開動作させて先行注
水を行なう。第５の発明では、上記第１〜第４の発明を
２つ以上組み合わせることにより、より一層効果的に注
水を抑える。In the first aspect of the invention, the condition of the switching means is added that the difference between the load request signal and the current load signal is greater than or equal to a predetermined value, thereby suppressing water injection. In the second aspect of the invention, the condition of the switching means is added that the lower limit operation state (state in which the decrease of the steam temperature by the recirculation gas control cannot be expected) continues for a predetermined time, whereby the lower limit operation state is set within the predetermined time. When it disappears, the steam temperature is controlled by recirculating gas to suppress water injection. In the third aspect of the invention, the rate of change of the deviation is limited by the rate of change restricting means when the adjusting valve is operating in the closing direction, and the repetition of water injection that is repeated continuously is suppressed. In the fourth invention, not only the deviation and the reheat steam temperature are not less than the respective predetermined values by the preceding water injection means, but also the steam adjustment is performed only when the difference between the load request signal and the load signal is not less than the predetermined value. The valve is opened to perform preparatory water injection. In the fifth invention, the water injection is suppressed even more effectively by combining two or more of the first to fourth inventions.
【００２１】[0021]
【実施例】以下、本発明を図示の実施例に基づいて説明
する。図１は本発明の実施例に係る再熱蒸気系減温器の
注水制御装置のブロック図である。図で、図８に示す部
分と同一又は等価な部分には同一符号を付して説明を省
略する。６４は発電端出力値、６５は減算器、６６は関
数発生器、７０は変化率制限器、７１は微分器、７２、
７３はモニタリレーである。Ａ2 は信号切換器５６の切
り換え信号、Ｂ2 は信号切換器６０の切り換え信号、Ｃ
は変化率制限器７０の作動信号である。The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram of a water injection control device for a reheat steam desuperheater according to an embodiment of the present invention. In the figure, parts that are the same as or equivalent to the parts shown in FIG. 64 is a generator end output value, 65 is a subtractor, 66 is a function generator, 70 is a change rate limiter, 71 is a differentiator, 72,
73 is a monitor relay. A 2 is a switching signal of the signal switch 56, B 2 is a switching signal of the signal switch 60, C
Is an operation signal of the rate-of-change limiter 70.
【００２２】ここで、信号切換器５６、６０の切換信号
Ａ2 、Ｂ2 、および変化率制限器７０の作動信号Ｃの出
力条件を図２、図３および図４に示す。図２は信号切換
器５６の切換条件を示す図である。この図で、ＡＮＤは
論理積、ＯＲは論理和、ＤＥＲは時間的遅延を示す。切
換信号Ａ2 は次の条件が発生したとき出力される。
（ｉ）負荷が所定値ａ以上であり、かつ、「発電要求出
力指令値」と「現在の発電端に要求されている出力値」
との差が所定値ｂ以上であるとき、又は、（ii）火炉ホ
ッパダンパ下限動作がＤＥＲに設定された時間以上継続
されているとき。Output conditions of the switching signals A 2 and B 2 of the signal switching devices 56 and 60 and the operation signal C of the change rate limiting device 70 are shown in FIGS. 2, 3 and 4. FIG. 2 is a diagram showing switching conditions of the signal switch 56. In this figure, AND is a logical product, OR is a logical sum, and DER is a time delay. The switching signal A 2 is output when the following conditions occur.
(I) The load is equal to or greater than the predetermined value a, and the "power generation required output command value" and the "current output value required at the power generation end"
Is greater than or equal to a predetermined value b, or (ii) the furnace hopper damper lower limit operation is continued for a time set for DER or more.
【００２３】上記（「発電要求出力指令値」−「現発電
端要求出力値」≧ｂ）の条件は、発電機出力指令値の発
電端要求指令値に対する変化が小さいときには再熱蒸気
温度の変化幅も小さいことから、このような場合にはス
プレーを行わないようにする条件であり、本実施例で
は、従来装置における条件にこの条件を加えることによ
り、従来装置よりさらにスプレーを抑制することができ
る。又、火炉ホッパダンパが下限動作状態になっても、
即ち、これ以上再循環ガス制御による蒸気温度下降が望
めない状態になっても、直ちに切換信号Ａ2 を出力せ
ず、所定時間（例えば数１０秒）待っても当該下限動作
が継続しているときに限り切換信号Ａ2 を出力する。こ
れにより、当該所定時間内に再循環ガス制御が可能とな
ったときには、スプレーを実施しなくても済み、スプレ
ーを抑制することができる。The above condition ("power generation required output command value"-"current power generation end required output value" ≥b) is that the reheat steam temperature changes when the change in the generator output command value with respect to the power generation end required command value is small. Since the width is also small, it is a condition to prevent spraying in such a case, and in this embodiment, by adding this condition to the condition in the conventional apparatus, it is possible to further suppress the spray than in the conventional apparatus. it can. Also, even if the furnace hopper damper is in the lower limit operating state,
That is, even if the steam temperature cannot be further lowered by controlling the recirculation gas, the switching signal A 2 is not immediately output, and the lower limit operation continues even after waiting a predetermined time (for example, several tens of seconds). The switching signal A 2 is output only occasionally. Accordingly, when the recirculation gas control can be performed within the predetermined time, it is not necessary to perform the spray, and the spray can be suppressed.
【００２４】図３は変化率制限器７０の作動信号Ｃの出
力条件を示す図である。この図で、ＡＮＤは論理積を示
す。作動信号Ｃは次の条件が発生したとき出力される。
（ｉ）再熱器スプレー流量調整弁４５が自動的に制御さ
れる状態にあり、かつ、（ii）負荷が変化中であり、か
つ、（iii）再熱器スプレー流量調整弁４５が閉じ方向
の開度指令を受けて動作しており、かつ、（iv）再熱器
スプレー流量調整弁４５の開度指令が所定の値ｃ％未満
であるとき。これら条件のうち、（ｉ）、（ii）はボイ
ラ制御装置から得ることができ、又、（iii）は図１に
示す微分器７１とモニタリレー７３で検出され、さら
に、（iv）は図１に示すモニタリレー７２で検出され
る。これら条件の効果については後述する。FIG. 3 is a diagram showing an output condition of the operation signal C of the change rate limiter 70. In this figure, AND indicates a logical product. The operation signal C is output when the following conditions occur.
(I) The reheater spray flow rate adjusting valve 45 is in a state of being automatically controlled, (ii) the load is changing, and (iii) the reheater spray flow rate adjusting valve 45 is in the closing direction. When the reheater spray flow rate adjusting valve 45 has an opening degree command of less than a predetermined value c%. Among these conditions, (i) and (ii) can be obtained from the boiler controller, (iii) is detected by the differentiator 71 and the monitor relay 73 shown in FIG. 1, and (iv) is It is detected by the monitor relay 72 shown in FIG. The effect of these conditions will be described later.
【００２５】図４は信号切換器６０の切換条件を示す図
である。この図で、ＡＮＤは論理積、を示す。切換信号
Ａ2 は図１０に示す各条件に加えて、図２に示すものと
同じく「発電要求出力指令値」と「現在の発電端に要求
されている出力値」との差が所定値ｂ以上であるという
条件も満足したときに出力される。この条件が加えられ
たことにより、信号切換器５６の切換条件と同じ理由
で、従来装置よりさらに先行的スプレーの実施を抑制す
ることができる。FIG. 4 is a diagram showing switching conditions of the signal switch 60. In this figure, AND indicates a logical product. In addition to the conditions shown in FIG. 10, the switching signal A 2 has the difference between the “power generation required output command value” and the “current output value required at the power generation end” as shown in FIG. It is output when the above condition is also satisfied. Due to the addition of this condition, it is possible to further suppress the advance spraying from the conventional device for the same reason as the switching condition of the signal switch 56.
【００２６】次に、本実施例の動作を説明する。切換信
号Ａ2 の切換条件として、従来の切換信号Ａ1 の切換条
件に、「発電要求出力指令値」と「現在の発電端に要求
されている出力値」との差が所定値ｂ以上であることを
加えることにより、信号切換器５６が信号発生器５５側
へ切り換えられる動作が抑えられ、その分スプレーが抑
えられることは図２に示す条件の説明で述べたとおりで
ある。信号切換器５６の切換状態の如何にかかわらず、
減算器５８からの偏差信号は比例積分器５９を経て変化
率制限器７０に入力される。Next, the operation of this embodiment will be described. As the switching condition of the switching signal A 2 , the difference between the “power generation required output command value” and the “current output value required at the power generation end” is the predetermined value b or more in the conventional switching signal A 1 switching condition. As described in the description of the conditions shown in FIG. 2, the addition of a certain thing suppresses the operation of switching the signal switch 56 to the signal generator 55 side, and the spray is suppressed accordingly. Regardless of the switching state of the signal switch 56,
The deviation signal from the subtractor 58 is input to the change rate limiter 70 via the proportional integrator 59.
【００２７】変化率制限器７０は、作動信号Ｃが入力さ
れない状態では比例積分器５９からの信号をそのまま信
号切換器６０へ送信する。作動信号Ｃの出力条件のう
ち、再熱器スプレー流量調整弁４５が閉じ方向の開度指
令を受けていることは上述のように微分器７１で検出さ
れ、この検出信号はモニタリレー７３を介して変化率制
限器７０に入力される。なお、再熱器スプレー流量調整
弁４５が動作していることはボイラ制御装置により把握
される。又、再熱器スプレー流量調整弁４５の開度指令
が所定の値ｃ％未満であることは、モニタリレー７２で
検出され、その信号が変化率制限器７０に入力される。The change rate limiter 70 transmits the signal from the proportional integrator 59 to the signal switch 60 as it is when the actuation signal C is not input. Among the output conditions of the operation signal C, the fact that the reheater spray flow rate adjusting valve 45 receives the opening direction command in the closing direction is detected by the differentiator 71 as described above, and this detection signal is transmitted via the monitor relay 73. And input to the rate-of-change limiter 70. In addition, it is understood by the boiler controller that the reheater spray flow rate adjusting valve 45 is operating. Further, the fact that the opening degree command of the reheater spray flow rate adjusting valve 45 is less than the predetermined value c% is detected by the monitor relay 72, and the signal is input to the change rate limiter 70.
【００２８】作動信号Ｃの出力条件が揃うと、変化率制
限器７０は比例積分器５９からの信号の閉じ方向の変化
を抑えるように機能する。これを図５に示す。図５は変
化率制限器７０の動作を説明する図である。この図で、
横軸には時間が、縦軸には再熱器スプレー流量調整弁４
５の開度がとってあり、スプレーが時間ｔ1 、ｔ2 （例
えばそれぞれ数分）間隔で３回連続して実施された場合
が示されている。図の実線は変化率制限器７０が設けら
れていない従来装置における再熱器スプレー流量調整弁
４５の動作を示す。When the output conditions of the actuation signal C are met, the rate-of-change limiter 70 functions to suppress the change of the signal from the proportional integrator 59 in the closing direction. This is shown in FIG. FIG. 5 is a diagram illustrating the operation of the change rate limiter 70. In this figure,
The horizontal axis is time, and the vertical axis is the reheater spray flow rate control valve 4.
An opening of 5 is taken, and the case where the spraying is continuously performed three times at intervals of time t 1 and t 2 (for example, several minutes each) is shown. The solid line in the figure shows the operation of the reheater spray flow rate adjusting valve 45 in the conventional device in which the rate-of-change limiter 70 is not provided.
【００２９】再熱器スプレー流量調整弁４５の開度がｃ
％未満であり、かつ、再熱器スプレー流量調整弁４５が
閉じ方向に動作しているとき、作動信号Ｃが出力して変
化率制限器７０を作動させ、その結果、比例積分器５９
からの信号の変化は緩和され、再熱器スプレー流量調整
弁４５の開度は、図５に破線で示すように変化し、図示
の場合、スプレーは１回だけ行われることになる。この
場合、再熱器スプレー流量調整弁４５の開度は、従来装
置では２回全閉状態（再熱蒸気管や減温器が高温になる
状態）になり、再熱蒸気管や減温器で生じる温度差が大
きくなる状態が繰り返されるのに対して、本実施例では
上記２回の全閉状態は存在しないので、温度差が大きく
なる状態の繰り返しは緩和され、その分、低温再熱蒸気
管や減温器の熱疲労による損傷の防止に大きく寄与する
ことができる。The opening of the reheater spray flow rate adjusting valve 45 is c
%, And when the reheater spray flow rate adjusting valve 45 is operating in the closing direction, the operation signal C is output to operate the change rate limiter 70, and as a result, the proportional integrator 59.
The change in the signal from is relieved, and the opening degree of the reheater spray flow rate adjusting valve 45 changes as shown by the broken line in FIG. 5, and in the case shown, the spraying is performed only once. In this case, the opening degree of the reheater spray flow rate adjusting valve 45 is fully closed twice (state where the reheat steam pipe and the desuperheater become high temperature) in the conventional device, and the reheat steam pipe and the desuperheater are opened. While the state in which the temperature difference that occurs in 1 is increased is repeated, in the present embodiment, since the above-described two fully closed states do not exist, the repetition of the state in which the temperature difference is increased is relaxed, and the low temperature reheat It can greatly contribute to the prevention of damage due to thermal fatigue of the steam pipe and the desuperheater.
【００３０】次に、信号切換器６０と関数発生器６６に
よる先行的スプレーについて説明する。切換信号Ｂ2 の
切換条件として、従来の切換信号Ｂ1 の切換条件に、
「発電要求出力指令値」と「現在の発電端に要求されて
いる出力値」との差が所定値ｂ以上であることを加える
ことにより、信号切換器６０が関数発生器５５側へ切り
換えられる動作が抑えられ、その分スプレーが抑えられ
ることは、上述の信号切換器５６の場合と同じである。
又、本実施例では、関数発生器６６の特性が、発電機出
力指令値５１と発電端出力値６４の偏差に応じて定めら
れており、これにより、負荷変化の大きさに対応するス
プレー特性を容易に得ることができる。Next, the advanced spraying by the signal switch 60 and the function generator 66 will be described. As the switching condition of the switching signal B 2, the switching condition of the conventional switching signal B 1 is
The signal switch 60 is switched to the function generator 55 side by adding that the difference between the "power generation request output command value" and the "current output value requested at the power generation end" is a predetermined value b or more. The operation is suppressed and the spray is suppressed accordingly, as in the case of the signal switch 56 described above.
Further, in the present embodiment, the characteristic of the function generator 66 is determined according to the deviation between the generator output command value 51 and the power generation end output value 64, whereby the spray characteristic corresponding to the magnitude of the load change. Can be easily obtained.
【００３１】このように、本実施例では、信号切換器５
６、６０の切換条件に、「発電要求出力指令値」と「現
在の発電端に要求されている出力値」との差が所定値ｂ
以上であることを加えたので、従来装置に比較してスプ
レーの実施をより一層抑えることができ、又、変化率制
限器７０を設けたので、スプレーによって再熱蒸気管や
減温器で生じる温度差が大きくなる状態を抑えることが
でき、これらにより、低温再熱蒸気管や減温器の熱疲労
による損傷を防止することができる。Thus, in this embodiment, the signal switch 5
Under the switching conditions of 6 and 60, the difference between the "power generation required output command value" and the "current output value required at the power generation end" is a predetermined value b.
Since the above is added, the spraying can be further suppressed as compared with the conventional apparatus, and since the change rate limiter 70 is provided, the spray is generated in the reheat steam pipe or the desuperheater. It is possible to suppress a state in which the temperature difference becomes large, and by doing so, it is possible to prevent damage to the low temperature reheat steam pipe and the desuperheater due to thermal fatigue.
【００３２】なお、上記実施例の説明では、（Ｉ）信号
切換器５６の切換条件に、「発電要求出力指令値」と
「現在の発電端に要求されている出力値」との差が所定
値ｂ以上であることを加える手段、（II)信号切換器５
６の切換条件に、火炉ホッパダンパ下限動作となった信
号を遅延させる手段、（III）変化率制限器７０を設け
る手段、および、（IV）信号切換器６０の切換条件に、
「発電要求出力指令値」と「現在の発電端に要求されて
いる出力値」との差が所定値ｂ以上であることを加える
手段の全てを備える例について説明したが、これらを全
て設ける必要はなく、それらを単独に、即ち、（Ｉ）、
（II）、（III）、（IV）のいずれか１つのみを設けて
もよいし、それらの全ての組み合わせ、即ち、（Ｉ）と
（II）、（Ｉ）と（III）、（Ｉ）と（IV）、（II）と
（III）、（II）と（IV）、（III）と（IV）、（Ｉ）と
（II）と（III）、（Ｉ）と（II）と（IV）、（II）と
（III）と（IV）の組合せのうちのいずれの組合せでも
所期の効果を得ることができる。In the description of the above embodiment, the difference between the "power generation required output command value" and the "current output value required at the power generation end" is predetermined as the switching condition of the signal switching device 56. Means for adding value b or more, (II) Signal switch 5
In the switching conditions of 6, the means for delaying the signal that has become the lower limit operation of the furnace hopper damper, (III) means for providing the change rate limiter 70, and (IV) the switching conditions for the signal switcher 60,
An example has been described in which all the means for adding the difference between the "power generation required output command value" and the "current output value required at the power generation end" to the predetermined value b or more are provided, but it is necessary to provide all of them. But not by themselves, ie (I),
Only one of (II), (III) and (IV) may be provided, or all combinations thereof, that is, (I) and (II), (I) and (III), (I ) And (IV), (II) and (III), (II) and (IV), (III) and (IV), (I) and (II) and (III), (I) and (II) The desired effect can be obtained by any combination of (IV), (II), (III) and (IV).
【００３３】[0033]
【発明の効果】以上述べたように、本発明では、信号切
換器の切換条件に、「発電要求出力指令値」と「現在の
発電端に要求されている出力値」との差が所定値ｂ以上
であることを加える手段と、信号切換器の切換条件に、
火炉ホッパダンパ下限動作となった信号を遅延させる手
段と、変化率制限器７０を設ける手段と、先行的注水を
選択する信号切換器の切換条件に、「発電要求出力指令
値」と「現在の発電端に要求されている出力値」との差
が所定値ｂ以上であることを加える手段のうちのいずれ
か１つ又はそれら手段を任意に組み合わせて用いるよう
にしたので、再熱蒸気の減温器による注水を抑えること
ができ、又は、スプレーによる温度差が大きくなる状態
を抑えることができ、ひいては、低温再熱蒸気管や減温
器の熱疲労による損傷を防止することができる。As described above, according to the present invention, the difference between the "power generation required output command value" and the "current power generation terminal required output value" is the predetermined value in the switching condition of the signal switch. b) or more, and the switching condition of the signal switch,
"Power generation required output command value" and "current power generation" are included in the switching condition of the means for delaying the signal of the lower limit operation of the furnace hopper damper, the means for providing the rate-of-change limiter 70, and the signal switcher for selecting the advanced water injection. Since any one of the means for adding that the difference from the "output value required at the end" is a predetermined value b or more, or any combination thereof, is used. It is possible to suppress water injection by the vessel, or suppress a state in which the temperature difference due to spraying becomes large, and thus prevent damage to the low temperature reheat steam pipe and the desuperheater due to thermal fatigue.
【図１】本発明の実施例に係る再熱蒸気系減温器の注水
制御装置のブロック図である。FIG. 1 is a block diagram of a water injection control device for a reheat steam-type desuperheater according to an embodiment of the present invention.
【図２】図１に示す信号切換器５６の切換条件を示す図
である。FIG. 2 is a diagram showing switching conditions of a signal switcher 56 shown in FIG.
【図３】図１に示す変化率制限器の作動信号出力の切換
条件を示す図である。FIG. 3 is a diagram showing a switching condition of an operation signal output of the change rate limiter shown in FIG.
【図４】図１に示す信号切換器６０の切換条件を示す図
である。FIG. 4 is a diagram showing switching conditions of the signal switcher 60 shown in FIG.
【図５】変化率制限器の動作を説明する図である。FIG. 5 is a diagram illustrating the operation of the change rate limiter.
【図６】ボイラ構成の概要を示す図である。FIG. 6 is a diagram showing an outline of a boiler configuration.
【図７】ボイラの水−蒸気系の系統図である。FIG. 7 is a system diagram of a water-steam system of a boiler.
【図８】図７に示す再熱器スプレー流量調整弁を制御す
る注水制御装置のブロック図である。8 is a block diagram of a water injection control device that controls the reheater spray flow rate adjusting valve shown in FIG. 7. FIG.
【図９】図８に示す信号切換器５６の切換条件を示す図
である。9 is a diagram showing switching conditions of the signal switcher 56 shown in FIG.
【図１０】図８に示す信号切換器６０の切換条件を示す
図である。10 is a diagram showing switching conditions of the signal switch 60 shown in FIG.
【図１１】図７に示す減温器４３の一部断面図である。11 is a partial cross-sectional view of the temperature reducer 43 shown in FIG.
５１ 発電機出力指令値 ５２ 再熱蒸気温度測定信号 ５３、６６ 関数発生器 ５４、５５ 信号発生器 ５６、６０ 信号切換器 ６４ 発電端出力値 ７０ 変化率制限器 ７１ 微分器 ７２、７３ モニタリレー 51 Generator Output Command Value 52 Reheat Steam Temperature Measurement Signal 53, 66 Function Generator 54, 55 Signal Generator 56, 60 Signal Switcher 64 Generator End Output Value 70 Change Rate Limiter 71 Differentiator 72, 73 Monitor Relay
───────────────────────────────────────────────────── フロントページの続き (72)発明者 三好 泰弘 広島県呉市宝町６番９号 バブコツク日立 株式会社呉工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Miyoshi 6-9 Takaracho, Kure City, Hiroshima Prefecture Babkotsk Hitachi Ltd. Kure Factory
Claims (5)
ガス量をダンパの開度で制御する排ガス再循環制御手段
と、再熱蒸気配管に介在して注水を行う減温器を非作動
とする温度が設定されこの温度に応じた信号を出力する
第１の信号発生手段と、前記減温器を作動させる温度が
設定されこの温度に応じた信号を出力する第２の信号発
生手段と、前記排ガス再循環制御手段が下限動作状態に
あり、かつ、前記ボイラの負荷信号が所定値以上である
ことを条件として前記第１の信号発生手段の出力信号を
前記第２の信号発生手段の出力信号に切り換える切換手
段と、負荷要求信号に応じた再熱蒸気温度に前記切換手
段で切り換えられた信号を加算する加算手段と、この加
算手段の信号と再熱蒸気温度の測定信号との偏差を演算
する演算手段と、前記偏差に応じて開度が調整される前
記減温器の調整弁とを備えた再熱蒸気系減温器の注水制
御装置において、前記切換手段の前記条件に、負荷要求
信号と前記負荷信号との差が所定値以上であることを付
加したことを特徴とする再熱蒸気系減温器の注水制御装
置。1. An exhaust gas recirculation control means for controlling the amount of exhaust gas to be recirculated from the furnace bottom of a boiler to the inside of the furnace by a damper opening, and a desuperheater for injecting water by interposing a reheat steam pipe are inoperative. A first signal generating means for setting a temperature to be set and outputting a signal corresponding to this temperature, and a second signal generating means for setting a temperature for operating the desuperheater and outputting a signal according to this temperature. , The exhaust gas recirculation control means is in a lower limit operation state, and the load signal of the boiler is a predetermined value or more, the output signal of the first signal generating means of the second signal generating means Switching means for switching to the output signal, addition means for adding the signal switched by the switching means to the reheated steam temperature according to the load request signal, and deviation between the signal of the addition means and the reheated steam temperature measurement signal And computing means for computing In the water injection control device of the reheat steam system desuperheater, which includes an adjusting valve of the desuperheater whose opening is adjusted according to the deviation, in the condition of the switching means, the load request signal and the load signal The water injection control device for the reheat steam desuperheater, which is characterized in that the difference between the reheat steam desuperheater and the reheat steam desuperheater is added.
ガス量をダンパの開度で制御する排ガス再循環制御手段
と、再熱蒸気配管に介在して注水を行う減温器を非作動
とする温度が設定されこの温度に応じた信号を出力する
第１の信号発生手段と、前記減温器を作動させる温度が
設定されこの温度に応じた信号を出力する第２の信号発
生手段と、前記排ガス再循環制御手段が下限動作状態に
あり、かつ、前記ボイラの負荷信号が所定値以上である
ことを条件として前記第１の信号発生手段の出力信号を
前記第２の信号発生手段の出力信号に切り換える切換手
段と、負荷要求信号に応じた再熱蒸気温度に前記切換手
段で切り換えられた信号を加算する加算手段と、この加
算手段の信号と再熱蒸気温度の測定信号との偏差を演算
する演算手段と、前記偏差に応じて開度が調整される前
記減温器の調整弁とを備えた再熱蒸気系減温器の注水制
御装置において、前記切換手段の前記条件に、前記下限
動作状態が所定時間継続することを付加したことを特徴
とする再熱蒸気系減温器の注水制御装置。2. The exhaust gas recirculation control means for controlling the amount of exhaust gas recirculated from the furnace bottom of the boiler into the furnace by the opening of the damper, and the desuperheater for injecting water by interposing the reheated steam pipe are inoperative. A first signal generating means for setting a temperature to be set and outputting a signal corresponding to this temperature, and a second signal generating means for setting a temperature for operating the desuperheater and outputting a signal according to this temperature. , The exhaust gas recirculation control means is in a lower limit operation state, and the load signal of the boiler is a predetermined value or more, the output signal of the first signal generating means of the second signal generating means Switching means for switching to the output signal, addition means for adding the signal switched by the switching means to the reheated steam temperature according to the load request signal, and deviation between the signal of the addition means and the reheated steam temperature measurement signal And computing means for computing In the water injection control device of the reheat steam system desuperheater having an adjusting valve of the desuperheater whose opening is adjusted according to the deviation, in the condition of the switching means, the lower limit operation state is a predetermined time. A water injection control device for a reheat steam-type desuperheater, which is characterized in that continuation is added.
ガス量をダンパの開度で制御する排ガス再循環制御手段
と、再熱蒸気配管に介在して注水を行う減温器を非作動
とする温度が設定されこの温度に応じた信号を出力する
第１の信号発生手段と、前記減温器を作動させる温度が
設定されこの温度に応じた信号を出力する第２の信号発
生手段と、前記排ガス再循環制御手段が下限動作状態に
あり、かつ、前記ボイラの負荷信号が所定値以上である
ことを条件として前記第１の信号発生手段の出力信号を
前記第２の信号発生手段の出力信号に切り換える切換手
段と、負荷要求信号に応じた再熱蒸気温度に前記切換手
段で切り換えられた信号を加算する加算手段と、この加
算手段の信号と再熱蒸気温度の測定信号との偏差を演算
する演算手段と、前記偏差に応じて開度が調整される前
記減温器の調整弁とを備えた再熱蒸気系減温器の注水制
御装置において、前記調整弁が閉じ方向に動作している
とき前記偏差の変化率を制限する変化率制限手段を設け
たことを特徴とする再熱蒸気系減温器の注水制御装置。3. An exhaust gas recirculation control means for controlling the amount of exhaust gas recirculated from the furnace bottom of a boiler to the inside of the furnace by a damper opening, and a desuperheater for injecting water by interposing a reheat steam pipe are inoperative. A first signal generating means for setting a temperature to be set and outputting a signal corresponding to this temperature, and a second signal generating means for setting a temperature for operating the desuperheater and outputting a signal according to this temperature. , The exhaust gas recirculation control means is in a lower limit operation state, and the load signal of the boiler is a predetermined value or more, the output signal of the first signal generating means of the second signal generating means Switching means for switching to the output signal, addition means for adding the signal switched by the switching means to the reheated steam temperature according to the load request signal, and deviation between the signal of the addition means and the reheated steam temperature measurement signal And computing means for computing In the water injection control device of the reheat steam system desuperheater provided with the adjustment valve of the desuperheater whose opening is adjusted according to the deviation, the deviation of the deviation when the adjustment valve is operating in the closing direction. A water injection control device for a reheat steam desuperheater, characterized in that a change rate limiting means for limiting the change rate is provided.
ガス量をダンパの開度で制御する排ガス再循環制御手段
と、再熱蒸気配管に介在して注水を行う減温器を非作動
とする温度が設定されこの温度に応じた信号を出力する
第１の信号発生手段と、前記減温器を作動させる温度が
設定されこの温度に応じた信号を出力する第２の信号発
生手段と、前記排ガス再循環制御手段が下限動作状態に
あり、かつ、前記ボイラの負荷信号が所定値以上である
ことを条件として前記第１の信号発生手段の出力信号を
前記第２の信号発生手段の出力信号に切り換える切換手
段と、負荷要求信号に応じた再熱蒸気温度に前記切換手
段で切り換えられた信号を加算する加算手段と、この加
算手段の信号と再熱蒸気温度の測定信号との偏差を演算
する演算手段と、前記偏差に応じて開度が調整される前
記減温器の調整弁とを備えた再熱蒸気系減温器の注水制
御装置において、前記偏差および再熱蒸気温度上昇率が
それぞれ所定値以上であり、かつ、負荷要求信号と前記
負荷信号との差が所定値以上であることを条件として先
行的に蒸気調整弁を開動作させる先行注水手段を設けた
ことを特徴とする再熱蒸気系減温器の注水制御装置。4. An exhaust gas recirculation control means for controlling the amount of exhaust gas recirculated from the furnace bottom of a boiler to the inside of the furnace by a damper opening, and a desuperheater for injecting water through a reheat steam pipe are inoperative. A first signal generating means for setting a temperature to be set and outputting a signal corresponding to this temperature, and a second signal generating means for setting a temperature for operating the desuperheater and outputting a signal according to this temperature. , The exhaust gas recirculation control means is in a lower limit operation state, and the load signal of the boiler is a predetermined value or more, the output signal of the first signal generating means of the second signal generating means Switching means for switching to the output signal, addition means for adding the signal switched by the switching means to the reheated steam temperature according to the load request signal, and deviation between the signal of the addition means and the reheated steam temperature measurement signal And computing means for computing In the water injection control device of the reheat steam system desuperheater having the adjustment valve of the desuperheater whose opening degree is adjusted according to the deviation, the deviation and the reheat steam temperature rise rate are each a predetermined value or more. The reheat steam reduction system is characterized in that a pre-injection means for opening the steam regulating valve in advance is provided on condition that the difference between the load request signal and the load signal is greater than or equal to a predetermined value. Water injection control device for warmer.
ガス量をダンパの開度で制御する排ガス再循環制御手段
と、再熱蒸気配管に介在して注水を行う減温器を非作動
とする温度が設定されこの温度に応じた信号を出力する
第１の信号発生手段と、前記減温器を作動させる温度が
設定されこの温度に応じた信号を出力する第２の信号発
生手段と、前記排ガス再循環制御手段が下限動作状態に
あり、かつ、前記ボイラの負荷信号が所定値以上である
ことを条件として前記第１の信号発生手段の出力信号を
前記第２の信号発生手段の出力信号に切り換える切換手
段と、負荷要求信号に応じた再熱蒸気温度に前記切換手
段で切り換えられた信号を加算する加算手段と、この加
算手段の信号と再熱蒸気温度の測定信号との偏差を演算
する演算手段と、前記偏差に応じて開度が調整される前
記減温器の調整弁とを備えた再熱蒸気系減温器の注水制
御装置において、前記切換手段の前記条件に負荷要求信
号と前記負荷信号との差が所定値以上であることを付加
する手段、前記切換手段の前記条件に前記下限動作状態
が所定時間継続することを付加する手段、前記調整弁が
閉じ方向に動作しているとき前記偏差の変化率を制限す
る変化率制限手段、および前記偏差および再熱蒸気温度
がそれぞれ所定値以上であり、かつ、負荷要求信号と前
記負荷信号との差が所定値以上であることを条件として
先行的に蒸気調整弁を開動作させる先行注水手段のうち
の少なくとも２つを設けたことを特徴とする再熱蒸気系
減温器の注水制御装置。5. An exhaust gas recirculation control means for controlling the amount of exhaust gas recirculated from the furnace bottom of a boiler to the inside of the furnace by a damper opening, and a desuperheater for injecting water by interposing a reheat steam pipe are inoperative. A first signal generating means for setting a temperature to be set and outputting a signal corresponding to this temperature, and a second signal generating means for setting a temperature for operating the desuperheater and outputting a signal according to this temperature. , The exhaust gas recirculation control means is in a lower limit operation state, and the load signal of the boiler is a predetermined value or more, the output signal of the first signal generating means of the second signal generating means Switching means for switching to the output signal, addition means for adding the signal switched by the switching means to the reheated steam temperature according to the load request signal, and deviation between the signal of the addition means and the reheated steam temperature measurement signal And computing means for computing In the water injection control device of the reheat steam desuperheater provided with the adjustment valve of the desuperheater whose opening is adjusted according to the deviation, the load request signal and the load signal in the condition of the switching means. Means for adding that the difference is greater than or equal to a predetermined value, means for adding to the condition of the switching means that the lower limit operating state continues for a predetermined time, and the deviation when the adjustment valve is operating in the closing direction. Change rate limiting means for limiting the change rate, and the deviation and the reheated steam temperature are each a predetermined value or more and the difference between the load request signal and the load signal is a predetermined value or more. A water injection control device for a reheat steam desuperheater, characterized in that at least two of the preceding water injection means for opening the steam adjusting valve are provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26038494A JP3755910B2 (en) | 1994-10-25 | 1994-10-25 | Water injection control device for reheat steam desuperheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26038494A JP3755910B2 (en) | 1994-10-25 | 1994-10-25 | Water injection control device for reheat steam desuperheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08121708A true JPH08121708A (en) | 1996-05-17 |
| JP3755910B2 JP3755910B2 (en) | 2006-03-15 |
Family
ID=17347176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26038494A Expired - Fee Related JP3755910B2 (en) | 1994-10-25 | 1994-10-25 | Water injection control device for reheat steam desuperheater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3755910B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013543573A (en) * | 2010-10-05 | 2013-12-05 | シーメンス アクチエンゲゼルシヤフト | Fossil fuel combustion steam generator |
| CN107908204A (en) * | 2017-11-17 | 2018-04-13 | 广东核电合营有限公司 | The scaling method and system of one loop of nuclear power station voltage-stablizer shower valve polarization aperture |
| CN112983578A (en) * | 2021-03-03 | 2021-06-18 | 京能十堰热电有限公司 | Control system and method for exhaust steam temperature of deep peak regulation low-pressure cylinder |
-
1994
- 1994-10-25 JP JP26038494A patent/JP3755910B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013543573A (en) * | 2010-10-05 | 2013-12-05 | シーメンス アクチエンゲゼルシヤフト | Fossil fuel combustion steam generator |
| US9506376B2 (en) | 2010-10-05 | 2016-11-29 | Siemens Aktiengesellschaft | Fossil-fired steam generator |
| CN107908204A (en) * | 2017-11-17 | 2018-04-13 | 广东核电合营有限公司 | The scaling method and system of one loop of nuclear power station voltage-stablizer shower valve polarization aperture |
| CN107908204B (en) * | 2017-11-17 | 2021-07-23 | 广东核电合营有限公司 | Method and system for calibrating polarization opening of spray valve of loop voltage stabilizer of nuclear power station |
| CN112983578A (en) * | 2021-03-03 | 2021-06-18 | 京能十堰热电有限公司 | Control system and method for exhaust steam temperature of deep peak regulation low-pressure cylinder |
| CN112983578B (en) * | 2021-03-03 | 2022-11-29 | 京能十堰热电有限公司 | Control system and method for deep peak regulation low-pressure cylinder exhaust temperature |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3755910B2 (en) | 2006-03-15 |
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