JP2953794B2 - Steam control valve chest warming method - Google Patents
Steam control valve chest warming methodInfo
- Publication number
- JP2953794B2 JP2953794B2 JP3022442A JP2244291A JP2953794B2 JP 2953794 B2 JP2953794 B2 JP 2953794B2 JP 3022442 A JP3022442 A JP 3022442A JP 2244291 A JP2244291 A JP 2244291A JP 2953794 B2 JP2953794 B2 JP 2953794B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- steam
- control valve
- warming
- chest
- 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Turbines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は蒸気タービンプラントの
主タービンへの通気前における蒸気加減弁チェストのウ
ォーミング方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of warming a steam control valve chest before venting a main turbine of a steam turbine plant.
【０００２】[0002]
【従来の技術】図４は一般的なタービンプラントの主要
部系統を示す図であり、ボイラ１で発生した蒸気は主蒸
気管２を通り、主蒸気止め弁３（ＭＳＶ）および蒸気加
減弁４（ＣＶ）を経てタービン５に供給され、そのター
ビン５で仕事を行なった蒸気は復水器６で復水される。2. Description of the Related Art FIG. 4 is a diagram showing a main part system of a general turbine plant. Steam generated in a boiler 1 passes through a main steam pipe 2, a main steam stop valve 3 (MSV) and a steam control valve 4 The steam supplied to the turbine 5 via the (CV) and the work performed by the turbine 5 is condensed by the condenser 6.
【０００３】ところで、このようなタービンプラントの
起動時においては、タービンを冷機状態から起動し系統
に併入してから目標負荷に到達するまでの過程で、蒸気
加減弁チェスト、ケーシングをはじめとしてタービン各
部の温度は、例えば室温に近い温度から最終到達負荷時
にタービン内部を流れる蒸気温度に近い温度まで上昇・
変化することになる。この温度変化は上流側程大きく、
蒸気加減弁チェストや高圧タービンケーシングの入口部
は定格主蒸気温度（通常、５３０℃または５６６℃）ま
で上昇変化する。When such a turbine plant is started, during the process from the start of the turbine from a cold state to the joining of the system to the reaching of a target load, the turbine including a steam control valve chest, a casing, a turbine, and the like. The temperature of each part rises, for example, from a temperature close to room temperature to a temperature close to the steam temperature flowing inside the turbine at the time of the ultimate load
Will change. This temperature change is larger on the upstream side,
The steam control valve chest and the inlet of the high pressure turbine casing rise and fall to the rated main steam temperature (usually 530 ° C. or 566 ° C.).
【０００４】特に、蒸気加減弁チェストが主タービンケ
ーシングと一体形となっている場合は、ケーシングを内
部圧力に対して厚肉構造とする必要があるので、ケーシ
ングと一体となる蒸気加減弁チェストの内・外面には温
度差が生じ易くなり、熱膨脹を拘束し合うため、大きな
熱応力を発生し、さらに起動毎に発生するこの熱応力の
繰り返しによって、金属疲労が蓄積し、ついにはその寿
命を消費してクラックを発生させることがある。[0004] In particular, when the steam control valve chest is integral with the main turbine casing, the casing must have a thick-walled structure with respect to the internal pressure. A temperature difference easily occurs between the inner and outer surfaces, and thermal expansion is restrained.As a result, a large thermal stress is generated.Furthermore, due to the repetition of this thermal stress generated at every start, metal fatigue accumulates, and finally the life of the metal is reduced. Consumption may cause cracks.
【０００５】上記金属疲労蓄積度は温度変化量と温度変
化率に依存する。図５は金属疲労蓄積度をパラメータと
し、温度変化量および温度変化率との関係を示し、図中
矢印の方向に金属疲労蓄積度が大きくなる。すなわち、
温度変化量あるいは温度変化率が大きい程金属疲労蓄積
度は大きくなる。また、熱応力振幅とタービンの金属疲
労蓄積度は図６の関係にあり、発生する熱応力が大きい
程、寿命の消費が大きくなる。[0005] The degree of accumulation of metal fatigue depends on the temperature change rate and the temperature change rate. FIG. 5 shows the relationship between the temperature change amount and the temperature change rate using the degree of metal fatigue accumulation as a parameter. The degree of metal fatigue accumulation increases in the direction of the arrow in the figure. That is,
The larger the amount of temperature change or the rate of temperature change, the greater the degree of metal fatigue accumulation. The relationship between the amplitude of the thermal stress and the degree of accumulation of metal fatigue in the turbine is shown in FIG. 6. The greater the generated thermal stress, the greater the life consumption.
【０００６】したがって、タービンが長期間停止した後
の高温部金属温度が冷え切った状態から、熱い蒸気を入
れて起動することは、急激でかつ大きな温度変化をター
ビンに与えることになるので、金属寿命の消費の面から
は好ましくない。[0006] Therefore, starting with hot steam from a state in which the temperature of the high-temperature portion metal has been completely cooled after the turbine has been shut down for a long period of time gives a rapid and large temperature change to the turbine. It is not preferable from the viewpoint of consumption of life.
【０００７】そこで、起動中の温度変化幅を小さくする
ことを目的として、蒸気加減弁チェスト、特に主タービ
ンケーシングと一体形の蒸気加減弁チェストを起動前に
暖機するウォーミングが行なわれる。Therefore, for the purpose of reducing the temperature change width during startup, warming is performed to warm up the steam control valve chest, especially the steam control valve chest integrated with the main turbine casing before starting.
【０００８】図示において、主蒸気止め弁３の上流側に
は弁座前ドレン系統７およびそのドレン弁８が設けられ
ており、起動・停止過程において主蒸気管２および主蒸
気止め弁３で発生するドレンを排出するようにしてあ
る。また、主蒸気止め弁３の後流側には弁座後ドレン弁
系統９およびそのドレン弁１０が設けられており、起動
・停止過程において蒸気加減弁４等に発生するドレンの
排出を行なうようにしてある。In the figure, a drain system 7 in front of a valve seat and its drain valve 8 are provided on the upstream side of the main steam stop valve 3, and are generated in the main steam pipe 2 and the main steam stop valve 3 in a start / stop process. Drain is discharged. On the downstream side of the main steam stop valve 3, a post-valve drain valve system 9 and its drain valve 10 are provided so as to discharge drain generated in the steam control valve 4 and the like in a start / stop process. It is.
【０００９】しかして、蒸気加減弁チェストウォーミン
グは、ドレン弁８，１０および蒸気加減弁４を閉状態と
し、主蒸気止め弁３またはそれに内蔵されている副弁
（図示せず）を一定時間（通常２〜３分）開とすること
により、ウォーミング蒸気を蒸気加減弁４チェスト内に
導き、一定時間保持した後、主蒸気止め弁３または上記
副弁を閉じ、ウォーミング蒸気を蒸気加減弁チェスト内
に封じ込めて蒸気の熱を蒸気加減弁チェストメタルに伝
達させることにより行なう。Thus, in the steam warming of the steam control valve, the drain valves 8, 10 and the steam control valve 4 are closed, and the main steam stop valve 3 or the sub-valve (not shown) built therein is operated for a predetermined time. By opening (normally 2 to 3 minutes), the warming steam is guided into the steam control valve 4 chest, held for a certain time, and then the main steam stop valve 3 or the sub-valve is closed to control the warming steam. This is performed by transferring the heat of the steam contained in the valve chest to the steam control valve chest metal.
【００１０】このようにして蒸気加減弁チェスト内で熱
交換したウォーミング蒸気は温度が下がり復水し、この
復水が或程度蒸気加減弁チェスト内に溜まるが、一定時
間後主蒸気止め弁弁座後ドレン弁１０が開けられ蒸気加
減弁チェストで発生したドレンが排出される。この動作
を繰り返し、蒸気加減弁チェストのメタル温度が或値に
到達した時にウォーミング完了とする。The temperature of the warming steam exchanged in the steam control valve chest as described above decreases in temperature and condenses, and this condensed water accumulates in the steam control valve chest to a certain extent. After sitting, the drain valve 10 is opened, and the drain generated in the steam control valve chest is discharged. This operation is repeated, and when the metal temperature of the steam control valve chest reaches a certain value, the warming is completed.
【００１１】図７は、上記主蒸気止め弁３またはその副
弁および主蒸気止め弁弁座後ドレン弁１０の開閉タイミ
ングを示す図である。従来、主蒸気止め弁の開時間
ｔ1 、および主蒸気止め弁全閉後弁座後ドレン弁１０が
開かれるまでのウォーミング蒸気の蒸気加減弁チェスト
内への封じ込め時間ｔ2 は、予め決定された固有値で与
えられている。FIG. 7 is a diagram showing the opening / closing timing of the main steam stop valve 3 or its sub valve and the drain valve 10 after the main steam stop valve valve seat. Conventionally, the opening time t 1 of the main steam stop valve and the time t 2 for containing the warming steam in the steam control valve chest until the drain valve 10 is opened after the main steam stop valve is fully closed and after the valve seat is determined in advance. Given eigenvalues.
【００１２】[0012]
【発明が解決しようとする課題】ところが、上述の如き
ウォーミング方法においては、ウォーミングを行なう
際、蒸気加減弁チェストメタル温度に関係なく主蒸気止
め弁またはその副弁および弁座後ドレン弁の開閉タイミ
ングを一定にしているため、蒸気加減弁チェストウォー
ミングを開始した直後、すなわち蒸気加減弁チェストメ
タル温度が低い状態においては、ウォーミング蒸気供給
時間が必要以上に長くなる。したがって、図８に示すよ
うに蒸気加減弁チェストメタル温度は急激な変化を示
し、熱応力が発生するという問題がある。However, in the above-described warming method, when the warming is performed, the main steam stop valve or its sub valve and the drain valve after the valve seat are not affected by the steam control valve chest metal temperature. Since the opening / closing timing is fixed, immediately after the steam control valve chest warming is started, that is, immediately after the steam control valve chest metal temperature is low, the warming steam supply time becomes longer than necessary. Accordingly, as shown in FIG. 8, there is a problem that the steam control valve chest metal temperature shows a rapid change and thermal stress is generated.
【００１３】逆に、蒸気加減弁チェストウォーミングを
或程度実施した段階、すなわち蒸気加減弁チェストメタ
ル温度が高い状態においては、ウォーミング蒸気供給時
間が必要時間に比べて短いため、蒸気加減弁チェスト温
度の変化量が小さくなり、ウォーミング効果が減少しか
つウォーミング時間が必要以上に長くなる等の問題があ
る。Conversely, when the steam control valve chest warming is performed to some extent, that is, when the steam control valve chest metal temperature is high, since the warming steam supply time is shorter than the required time, the steam control valve chest There are problems that the amount of change in temperature is small, the warming effect is reduced, and the warming time is unnecessarily prolonged.
【００１４】このように従来のウォーミング方法は、蒸
気加減弁チェストウォーミング中に発生する急激な温度
変化を抑制させることができず、また逆に蒸気加減弁チ
ェストの温度変化が緩慢な場合に適正な温度変化に制御
することが困難である。As described above, the conventional warming method cannot suppress a rapid temperature change occurring during the steam control valve chest warming, and conversely, when the temperature change of the steam control valve chest is slow. It is difficult to control to an appropriate temperature change.
【００１５】また、ウォーミング蒸気の圧力・温度条件
が蒸気加減弁チェストウォーミング毎に異なるタービン
プラントにおいては、例えばウォーミング蒸気の圧力・
温度が高い場合には蒸気加減弁チェストに対し常に過度
な温度変化をもたらし、時には材料を降伏せしめる程の
熱応力を発生させることがある。逆に、ウォーミング蒸
気の圧力・温度が低い場合には、蒸気加減弁チェストメ
タル温度が上がらず、十分なウォーミング効果が得られ
ない可能性がある等の問題がある。Further, in a turbine plant in which the pressure and temperature conditions of the warming steam differ for each steam warming of the steam control valve, for example, the pressure and temperature of the warming steam
High temperatures will always cause excessive temperature changes in the steam regulator chest, and may sometimes generate thermal stresses that cause the material to yield. Conversely, when the pressure and temperature of the warming steam are low, there is a problem that the temperature of the steam control valve chest metal does not rise and a sufficient warming effect may not be obtained.
【００１６】本発明はこのような点に鑑み、起動時のウ
ォーミング蒸気条件や蒸気加減弁チェスト金属温度が異
なる場合においても、蒸気加減弁チェスト等に過度の熱
応力を与えることがなく、かつウォーミング時間も最短
とすることができるようにした蒸気加減弁チェストウォ
ーミング方法を得ることを目的とする。In view of the above, the present invention does not apply excessive thermal stress to the steam control valve chest and the like even when the warming steam conditions at start-up and the metal temperature of the steam control valve chest are different. It is an object of the present invention to provide a steam control valve chest warming method in which a warming time can be minimized.
【００１７】[0017]
【課題を解決するための手段】本発明は、蒸気加減弁の
ウォーミング用蒸気の供給、停止を行なう主蒸気止め弁
または主蒸気止め弁副弁と、ウォーミングの結果、前記
蒸気加減弁チェスト内に発生するドレンを排出せしめる
主蒸気止め弁弁座後ドレン弁とを交互に開閉させて上記
蒸気加減弁チェストのウォーミングを行なう蒸気加減弁
チェストウォーミング方法において、加減弁チェストメ
タル温度変化率が第１の設定値より大きくなったとき主
蒸気止め弁またはその副弁および主蒸気止め弁弁座後ド
レン弁を閉じて前記主蒸気止め弁または副弁と前記蒸気
止め弁弁座後ドレン弁間の配管内に蒸気を滞留させ、上
記第１の設定値より小さな第２の設定値より小さくなっ
たときに上記主蒸気止め弁弁座後ドレン弁を開き上記蒸
気加減弁チェスト内に発生するドレンを排出し、その
後、上記主蒸気止め弁弁座後ドレン弁を閉じ上記主蒸気
止め弁または副弁を開き上記蒸気加減弁のウォーミング
用蒸気を上記蒸気加減弁チェスト内に供給するようにし
たことを特徴とする。SUMMARY OF THE INVENTION The present invention provides a main steam stop valve or a main steam stop valve sub-valve for supplying and stopping warming steam of a steam control valve, and a steam control valve chest as a result of warming. In the steam control valve chest warming method of alternately opening and closing the main steam stop valve and the drain valve after the valve seat to discharge the drain generated in the chamber and warming the steam control valve chest, the rate of change of the control metal valve metal temperature Becomes larger than the first set value, the main steam stop valve or its sub-valve and the main steam stop valve after the valve seat are closed to close the main steam stop valve or the sub-valve and the steam stop valve after the valve seat drain valve The steam is retained in the pipe between the first steam valve and the steam valve after the main steam stop valve valve seat is opened when the steam pressure becomes smaller than a second set value smaller than the first set value. The main steam stop valve is closed and the main steam stop valve or the auxiliary valve is opened to supply the warming steam of the steam control valve into the steam control valve chest. It is characterized by doing.
【００１８】[0018]
【作用】蒸気加減弁チェストのウォーミングに際して
は、主蒸気止め弁或はその副弁を開けると、ウォーミン
グ蒸気が蒸気加減弁まで流入し、蒸気加減弁チェストの
ウォーミングが行なわれる。When warming the steam control valve chest, when the main steam stop valve or its sub-valve is opened, warming steam flows into the steam control valve, and the steam control valve chest is warmed.
【００１９】そこで、蒸気加減弁チェストメタルの温度
の上昇率が第１の設定値に達すると、主蒸気止め弁或は
その副弁が全閉され、その後メタル温度上昇率が鈍化
し、第２の設定値より小さくなると、主蒸気止め弁弁座
後ドレン弁が全開される。これによって、蒸気加減弁チ
ェスト内で熱交換によって生じたドレンが排出される。
そしてドレン排出後上記ドレン弁を閉じ、主蒸気止め弁
或はその副弁を開くことによって再びウォーミング蒸気
が供給され、以後これを繰り返すことによってウォーミ
ングを完了することができる。When the rate of increase in the temperature of the chest metal of the steam control valve reaches the first set value, the main steam stop valve or its sub-valve is fully closed. Becomes smaller than the set value, the drain valve after the main steam stop valve seat is fully opened. As a result, drain generated by heat exchange in the steam control valve chest is discharged.
After draining, the drain valve is closed, and the main steam stop valve or its sub-valve is opened to supply warming steam again. Thereafter, the warming can be completed by repeating this process.
【００２０】しかして、上記ウォーミング作動中蒸気加
減弁チェスト温度上昇率が一定の範囲内で制御されるこ
ととなる。Thus, the rate of increase in the temperature of the steam control valve chest during the warming operation is controlled within a certain range.
【００２１】[0021]
【実施例】図１において、蒸気加減弁のウォーミング開
始信号が発せられると、主蒸気止め弁弁座後ドレン弁が
全閉されるとともに主蒸気止め弁或はその副弁が全開さ
れ、ウォーミング蒸気の供給が行なわれる。そして、こ
の主蒸気止め弁或はその副弁の全開信号はＡＮＤ回路２
０に加えられる。In FIG. 1, when a warming start signal for the steam control valve is issued, the drain valve after the main steam stop valve seat is fully closed, and the main steam stop valve or its sub-valve is fully opened, and the warming is stopped. Mining steam is supplied. The fully open signal of the main steam stop valve or the sub valve is sent to the AND circuit 2
Added to 0.
【００２２】一方、蒸気加減弁チェストメタル温度検出
器２１によって蒸気加減弁チェストメタル温度が検出さ
れており、その温度信号は変化率演算器２２に入力さ
れ、ここでメタル温度変化率が計算され、信号ａとして
出力される。このメタル温度変化率信号ａは、それぞれ
比較器２３および比較器２４に入力される。On the other hand, the steam control valve chest metal temperature detector 21 detects the steam control valve chest metal temperature, and the temperature signal is input to a change rate calculator 22, where the metal temperature change rate is calculated. Output as signal a. The metal temperature change rate signal a is input to the comparator 23 and the comparator 24, respectively.
【００２３】上記比較器２３には第１の設定器２５から
の第１の設定信号Ａも入力されており、ここで前記メタ
ル温度変化率信号ａと比較され、メタル温度変化信号が
第１の設定信号Ａより大きいと、すなわち、ａ＞Ａとな
ると出力信号が発生され、この出力信号が前記ＡＮＤ回
路２０に加えられる。The comparator 23 also receives the first setting signal A from the first setting unit 25, where it is compared with the metal temperature change rate signal a, and the metal temperature change signal is output from the first setting signal A. If it is larger than the setting signal A, that is, if a> A, an output signal is generated, and this output signal is applied to the AND circuit 20.
【００２４】このようにしてＡＮＤ回路２０に主蒸気止
め弁或はその副弁全開信号および比較器２３からの出力
信号が入力されると、主蒸気止め弁或いはその副弁に全
閉指令信号が出力され主蒸気止め弁或はその副弁が全閉
され、その全閉信号が第２のＡＮＤ回路２６に加えられ
る。When the main steam stop valve or its sub-valve fully open signal and the output signal from the comparator 23 are input to the AND circuit 20 in this manner, a fully closed command signal is sent to the main steam stop valve or its sub-valve. The output and the main steam stop valve or its sub-valve are fully closed, and the fully closed signal is applied to the second AND circuit 26.
【００２５】また、比較器２４には第２の設定器２７か
ら第１の設定器２５の設定信号より小さい第２の設定信
号Ｂも入力されており、ここで前記メタル温度変化率信
号ａと比較され、メタル温度変化率信号ａが第２の設定
信号Ｂより小さいと、すなわちａ＜Ｂとなると出力信号
が発生され、この出力信号が前記第２のＡＮＤ回路２６
に入力される。The comparator 24 also receives a second setting signal B which is smaller than the setting signal of the first setting device 25 from the second setting device 27. Here, the metal temperature change rate signal a When the metal temperature change rate signal a is smaller than the second set signal B, that is, when a <B, an output signal is generated, and the output signal is generated by the second AND circuit 26.
Is input to
【００２６】そして、上記第２のＡＮＤ回路２６に主蒸
気止め弁或はその副弁の全開信号および比較器２４から
の出力信号が入力されると、主蒸気止め弁弁座後ドレン
弁に全開指令信号が出力される。このようにして上記ド
レン弁が全開すると、タイマー２８の設定時間経過後再
び主蒸気止め弁弁座後ドレン弁が全閉される。When the full-open signal of the main steam stop valve or its sub-valve and the output signal from the comparator 24 are input to the second AND circuit 26, the drain valve after the main steam stop valve seat is fully opened. A command signal is output. When the drain valve is fully opened in this way, the drain valve after the main steam stop valve seat is fully closed again after the set time of the timer 28 elapses.
【００２７】しかして、蒸気加減弁のウォーミングが開
始されると、主蒸気止め弁弁座後ドレン弁が全閉された
後主蒸気止め弁或はその副弁が全開され、蒸気加減弁チ
ェストにウォーミング蒸気が導入される。この状態で蒸
気加減弁チェストメタル温度はウォーミング蒸気のもつ
熱量によって上昇し、その温度変化率も上昇する。When the warming of the steam control valve is started, the drain valve after the main steam stop valve seat is fully closed, the main steam stop valve or its sub-valve is fully opened, and the steam control valve chest is opened. Warming steam is introduced into the air. In this state, the steam control valve chest metal temperature rises due to the amount of heat of the warming steam, and the temperature change rate also rises.
【００２８】この蒸気加減弁チェストメタル温度変化率
は前述のように信号ａとして計測演算されており、この
蒸気加減弁チェストメタル温度変化率ａが第１の設定信
号Ａに達し、ａ＞Ａとなると比較器２３の出力信号がＯ
Ｎとなり、第１のＡＮＤ回路２０に入力される。このと
き第１のＡＮＤ回路２０のもう一方の入力は主蒸気止め
弁或はその副弁全開信号であってすでに成立しているの
で、ａ＞Ａとなった時点で、次の段階に進行し、主蒸気
止め弁或はその副弁が全閉される。The steam control valve chest metal temperature change rate is measured and calculated as a signal a as described above. The steam control valve chest metal temperature change rate a reaches the first set signal A, and a> A When the output signal of the comparator 23 becomes O
N, which is input to the first AND circuit 20. At this time, the other input of the first AND circuit 20 is the main steam stop valve or its sub-valve fully open signal, which has already been established, so that when a> A, the process proceeds to the next stage. The main steam stop valve or its sub valve is fully closed.
【００２９】この状態では蒸気加減弁チェストにウォー
ミング蒸気が閉じ込められ、ウォーミング蒸気の持つ熱
量がチェストメタルに伝達されるに伴い、蒸気加減弁チ
ェストメタル温度は上昇し、ウォーミング蒸気の方は温
度が下がり、次第に復水しドレン化する。この間蒸気加
減弁チェストには新たな熱供給がないため、チェストメ
タルへの温度伝達が徐々に少なくなり、蒸気加減弁チェ
ストメタル温度変化率は主蒸気止め弁或はその副弁の全
閉後から減少しつづける。In this state, the warming steam is confined in the steam control valve chest, and the heat of the warming steam is transmitted to the chest metal. As a result, the temperature of the steam control valve chest metal increases, and the warming steam is The temperature drops, gradually condensate and drains. During this time, the steam control valve chest has no new heat supply, so the temperature transmission to the chest metal gradually decreases, and the steam control valve chest metal temperature change rate starts after the main steam stop valve or its sub-valve is fully closed. Continue to decrease.
【００３０】このようにして温度変化率信号ａが低下
し、第２の設定信号Ｂに達し、ａ＜Ｂとなると、比較器
２４の出力信号がＯＮとなり第２のＡＮＤ回路２６に入
力される。この第２のＡＮＤ回路２６のもう一方の入力
は主蒸気止め弁或はその副弁の全閉信号であって、この
時点ではそれ以前に成立しているため、ａ＜Ｂとなった
時点でさらに次の段階に進行し、主蒸気止め弁弁座後ド
レン弁が全開される。したがって、蒸気加減弁チェスト
内に閉じ込められメタルとの熱交換を終えた低温の蒸気
またはドレンが、上記主蒸気止め弁弁座後ドレン弁を通
って蒸気加減弁チェスト外に排出される。As described above, the temperature change rate signal a decreases, reaches the second set signal B, and when a <B, the output signal of the comparator 24 is turned on and input to the second AND circuit 26. . The other input of the second AND circuit 26 is a fully-closed signal of the main steam stop valve or its sub-valve, which has been established before this time. The process proceeds to the next step, and the drain valve after the main steam stop valve is fully opened. Therefore, the low-temperature steam or drain trapped in the steam control valve chest and exchanging heat with the metal is discharged out of the steam control valve chest through the drain valve after the main steam stop valve seat.
【００３１】そこで、主蒸気止め弁弁座後ドレン弁全開
後タイマー２８がカウントを始め、上記低温の蒸気また
はドレンの排出に要する時間ｔが経過後、再び図１のフ
ローチャートの先頭に戻り、主蒸気止め弁弁座後ドレン
弁が全閉され、以下上記と同様な制御が、蒸気加減弁チ
ェストのウォーミングが完了するまで繰り返される。Then, after the main steam stop valve valve seat and the drain valve are fully opened, the timer 28 starts counting. After the time t required for discharging the low-temperature steam or drain elapses, the process returns to the top of the flowchart of FIG. After the steam stop valve seat, the drain valve is fully closed, and the same control as described above is repeated until the warming of the steam control valve chest is completed.
【００３２】以上説明した主蒸気止め弁或はその副弁、
主蒸気止め弁弁座後ドレン弁、および蒸気加減弁チェス
トメタル温度の動きを図２に示す。The main steam stop valve described above or the auxiliary valve thereof,
FIG. 2 shows the movement of the drain metal after the main steam stop valve valve seat and the chest metal temperature of the steam control valve.
【００３３】すなわち、蒸気加減弁チェストウォーミン
グを開始し、主蒸気止め弁弁座後ドレン弁を閉とし、主
蒸気止め弁或はその副弁を全開した点ｍ1 でウォーミン
グ蒸気が蒸気加減弁チェスト内に導かれ、蒸気加減弁チ
ェストメタル温度が上昇し、点ｍ2 でメタル温度変化率
ａ1 がａ1 ＞Ａとなり主蒸気止め弁或はその副弁が全閉
となる。That is, the steam control valve chest warming is started, the drain valve is closed after the main steam stop valve valve seat, and the warming steam is controlled at the point m 1 when the main steam stop valve or its sub-valve is fully opened. guided in the valve chest, chest metal temperature steam control valve rises, the metal temperature change rate a 1 is a 1> a next main steam stop valve or the auxiliary valve is fully closed at point m 2.
【００３４】この状態ではウォーミング蒸気は蒸気加減
弁チェスト内に封じ込められ、チェストメタル温度を上
昇させるが、ウォーミング効果は時間とともに小さくな
り、メタル温度上昇率は減少する。そしてメタル温度変
化率ａ2 がａ2 ＜Ｂとなった時点ｍ3 で主蒸気止め弁弁
座後ドレン弁が開き、ドレン化したウォーミング蒸気が
系外に排出される。このようにしてドレンが排出された
ら主蒸気止め弁弁座後ドレン弁が閉となり、主蒸気止め
弁或はその副弁の開操作が始まる。そして、この操作を
繰り返すことによって蒸気加減弁チェストのウォーミン
グが行なわれる。In this state, the warming steam is confined in the steam control valve chest and raises the chest metal temperature. However, the warming effect decreases with time, and the metal temperature rise rate decreases. The metal temperature change rate a 2 is a 2 <a main steam stop valve valve seat after drain valve when m 3 became B opens, warming vapor drain of is discharged out of the system. When the drain is discharged in this manner, the drain valve is closed after the main steam stop valve seat, and the opening operation of the main steam stop valve or its sub-valve starts. Then, by repeating this operation, the steam control valve chest is warmed.
【００３５】図３は本発明の他の実施例を示す図であ
り、第１の設定器２５ａおよび第２の設定器２７ａが、
蒸気加減弁チェストメタル温度信号を入力してそのメタ
ル温度の関数として設定信号Ａ，Ｂを出力するようにし
てある。FIG. 3 is a diagram showing another embodiment of the present invention, wherein the first setting device 25a and the second setting device 27a are
A steam control valve chest metal temperature signal is input, and setting signals A and B are output as a function of the metal temperature.
【００３６】すなわち、図２に示すような主蒸気止め弁
の開閉を繰り返す蒸気加減弁チェストのウォーミングを
進めていった場合には、蒸気加減弁チェストのメタル温
度が上昇してくるにしたがって、ウォーミング蒸気と蒸
気加減弁チェストメタルとのミスマッチ温度が小さくな
ってくるために主蒸気止め弁を開けたときのメタル温度
上昇率が鈍化してくることもある。このような場合に
は、主蒸気止め弁の閉タイミング、主蒸気止め弁弁座後
ドレン弁の開タイミングを決定するメタル温度変化率の
値は、蒸気加減弁ウォーミングの開始から完了まで第１
実施例のように一定値とするよりも、蒸気加減弁ウォー
ミングの進み度合いに応じて設定値を可変とすることに
より、きめ細かい制御が可能となり、ウォーミング時間
をより適正化することが可能となる。In other words, when the warming of the steam control valve chest, which repeatedly opens and closes the main steam stop valve as shown in FIG. 2, is advanced, as the metal temperature of the steam control valve chest increases, Since the mismatch temperature between the warming steam and the steam control valve chest metal becomes smaller, the rate of metal temperature rise when the main steam stop valve is opened may be slowed down. In such a case, the value of the metal temperature change rate that determines the closing timing of the main steam stop valve and the opening timing of the drain valve after the main steam stop valve seat is the first from the start to the completion of the steam control valve warming.
Rather than having a constant value as in the embodiment, by making the set value variable according to the degree of progress of the steam control valve warming, fine control becomes possible, and the warming time can be made more appropriate. Become.
【００３７】しかして、上記第２実施例においては、ウ
ォーミング開始直後は許容メタル温度変化率付近の値に
なるまで主蒸気止め弁を開け続けるが、ウォーミングが
進行して温度上昇率が鈍化してくると、それに見合った
メタル温度変化率で主蒸気止め弁或はその副弁を閉める
こととなり、ウォーミング時間の適正化を図ることがで
きる。In the second embodiment, the main steam stop valve is kept open until the value near the allowable metal temperature change rate is reached immediately after the start of warming. However, warming progresses and the temperature rise rate slows down. Then, the main steam stop valve or its sub-valve is closed at a metal temperature change rate commensurate with it, and the warming time can be optimized.
【００３８】[0038]
【発明の効果】本発明は、上述のように蒸気加減弁チェ
ストメタル温度の変化率の値によって一旦開けた全蒸気
加減弁或はその副弁の閉タイミングを決定するととも
に、主蒸気止め弁弁座後ドレン弁の開タイミングを決定
しているため、蒸気加減弁チェストメタル温度変化率が
一定の範囲内で制御されることになり、過度の熱応力の
発生による寿命消費を防止でき、また主蒸気止め弁或は
その副弁の全閉後に蒸気加減弁チェスト内に閉じ込めら
れた蒸気からメタルへの熱伝達がほど完了した時点を正
確にとらえて次の行程に進めることができる。As described above, the present invention determines the closing timing of all the steam control valves once opened or the auxiliary valve thereof based on the value of the change rate of the chest metal temperature of the steam control valve, as well as the main steam stop valve. Since the opening timing of the after-seat drain valve is determined, the rate of change in the temperature of the chest metal of the steam control valve is controlled within a certain range, so that the life consumption due to the generation of excessive thermal stress can be prevented. After the steam stop valve or its sub-valve is fully closed, the time when the heat transfer from the steam trapped in the steam control valve chest to the metal is sufficiently completed can be accurately detected and the next step can be performed.
【００３９】このようにして、主蒸気止め弁或はその副
弁および主蒸気止め弁弁座後ドレン弁の開閉タイミング
を適正化することができ、一定の蒸気加減弁チェストメ
タル温度変化率でウォーミングが可能となり、最短の時
間で蒸気加減弁チェストウォーミングが可能となる。In this manner, the opening / closing timing of the main steam stop valve or its sub valve and the drain valve after the main steam stop valve seat can be optimized, and the warp can be maintained at a constant steam control valve chest metal temperature change rate. This enables steam warming and chest warming in the shortest time.
【００４０】また、ウォーミング蒸気の圧力、温度が異
なるタービンプラントにおいても、常に最適の蒸気加減
弁チェストメタル温度変化率でウォーミングが可能とな
る等の効果を奏する。Further, even in a turbine plant in which the pressure and the temperature of the warming steam are different, the warming can be always performed at the optimum steam control valve chest metal temperature change rate.
【図１】本発明の蒸気加減弁チェストウォーミング方法
を示すフローチャート。FIG. 1 is a flowchart illustrating a method of chest warming a steam control valve according to the present invention.
【図２】本発明のウォーミング方法を実施した場合にお
ける、主蒸気止め弁とその弁座後ドレン弁の開閉タイミ
ングと、蒸気加減弁チェストの温度変化を示す図。FIG. 2 is a diagram showing opening / closing timings of a main steam stop valve and a drain valve after the valve seat and a temperature change of a steam control valve chest when the warming method of the present invention is performed.
【図３】本発明の他の実施例を示すフローチャート。FIG. 3 is a flowchart showing another embodiment of the present invention.
【図４】蒸気加減弁チェストウォーミング装置の概略系
統図。FIG. 4 is a schematic system diagram of a steam control valve chest warming device.
【図５】温度変化量および温度変化率に関する金属疲労
蓄積度の関係を示す図。FIG. 5 is a graph showing the relationship between the degree of temperature change and the degree of temperature change with respect to the degree of accumulation of metal fatigue.
【図６】熱応力−疲労蓄積度線図。FIG. 6 is a thermal stress-fatigue accumulation degree diagram.
【図７】従来のウォーミング方法における主蒸気止め弁
とその弁座後ドレン弁の開閉タイミングを示す図。FIG. 7 is a diagram showing opening / closing timings of a main steam stop valve and a drain valve after the valve seat in a conventional warming method.
【図８】従来のウォーミング方法における蒸気加減弁チ
ェストの温度変化線図。FIG. 8 is a temperature change diagram of a steam control valve chest in a conventional warming method.
３ 主蒸気止め弁 ４ 蒸気加減弁 ５ タービン １０ 主蒸気止め弁弁座後ドレン弁 ２０，２６ ＡＮＤ回路 ２１ 蒸気加減弁チェストメタル温度検出器 ２２ 変化率演算器 ２３，２４ 比較器 ２５ 第１の設定器 ２７ 第２の設定器 Reference Signs List 3 main steam stop valve 4 steam control valve 5 turbine 10 drain valve after seat of main steam stop valve 20, 26 AND circuit 21 steam control valve chest metal temperature detector 22 change rate calculator 23, 24 comparator 25 first setting Container 27 Second setting device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 内 田 典 弘 東京都府中市東芝町１ 株式会社東芝 府中工場内 (56)参考文献 特開 昭54−118902（ＪＰ，Ａ) 特開 昭60−164603（ＪＰ，Ａ) 特開 昭63−302105（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) F01D 25/10 F01D 17/24 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Norihiro Uchida 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corporation (56) References JP-A-54-118902 (JP, A) JP-A-60- 164603 (JP, A) JP-A-63-302105 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) F01D 25/10 F01D 17/24
Claims (1)
停止を行なう主蒸気止め弁または主蒸気止め弁副弁と、
ウォーミングの結果、前記蒸気加減弁チェスト内に発生
するドレンを排出せしめる主蒸気止め弁弁座後ドレン弁
とを交互に開閉させて上記蒸気加減弁チェストのウォー
ミングを行なう蒸気加減弁チェストウォーミング方法に
おいて、加減弁チェストメタル温度変化率が第１の設定
値より大きくなったとき主蒸気止め弁またはその副弁お
よび主蒸気止め弁弁座後ドレン弁を閉じて前記主蒸気止
め弁または副弁と前記蒸気止め弁弁座後ドレン弁間の配
管内に蒸気を滞留させ、上記第１の設定値より小さな第
２の設定値より小さくなったときに蒸気主蒸気止め弁弁
座後ドレン弁を開き上記蒸気加減弁チェスト内に発生す
るドレンを排出し、その後、上記主蒸気止め弁弁座後ド
レン弁を閉じ上記主蒸気止め弁または副弁を開き上記蒸
気加減弁のウォーミング用蒸気を上記蒸気加減弁チェス
ト内に供給するようにしたことを特徴とする、蒸気加減
弁チェストウォーミング方法。1. Warming steam supply of a steam control valve,
A main steam stop valve or a main steam stop valve sub-valve for stopping,
Steam control valve chest warming for warming the steam control valve chest by alternately opening and closing the main steam stop valve and a drain valve after the valve seat for discharging drain generated in the steam control valve chest as a result of the warming. A main steam stop valve or a sub-valve thereof and a drain valve after the main steam stop valve seat are closed to close the main steam stop valve or the sub-valve when the change rate of the chest metal temperature change rate exceeds a first set value. And the steam is retained in the pipe between the steam stop valve and the post-seat drain valve, and when the steam becomes smaller than the second set value smaller than the first set value, the steam main steam stop valve is replaced with the drain valve after the seat. The drain generated in the steam control valve chest is opened, and the drain valve is closed after the main steam stop valve valve seat is closed, and the main steam stop valve or the auxiliary valve is opened and the steam control valve warms up. The ring steam, characterized in that so as to supply to the steam control valve in the chest, steam control valve chest warming method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3022442A JP2953794B2 (en) | 1991-02-16 | 1991-02-16 | Steam control valve chest warming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3022442A JP2953794B2 (en) | 1991-02-16 | 1991-02-16 | Steam control valve chest warming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04262005A JPH04262005A (en) | 1992-09-17 |
| JP2953794B2 true JP2953794B2 (en) | 1999-09-27 |
Family
ID=12082823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3022442A Expired - Fee Related JP2953794B2 (en) | 1991-02-16 | 1991-02-16 | Steam control valve chest warming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2953794B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4954053B2 (en) * | 2007-12-27 | 2012-06-13 | 中国電力株式会社 | Warming valve warming method, warming valve warming system |
| JP5478961B2 (en) * | 2009-06-30 | 2014-04-23 | 三菱重工業株式会社 | Valve control method and apparatus for warming of steam turbine |
| JP7304596B2 (en) * | 2017-07-07 | 2023-07-07 | 株式会社松井製作所 | Temperature control device and heating control method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54118902A (en) * | 1978-03-08 | 1979-09-14 | Toshiba Corp | Steam cut-off valve warming equipment |
| JPS60164603A (en) * | 1984-02-06 | 1985-08-27 | Toshiba Corp | Warmingup device for main steam control valve casing |
| JPS63302105A (en) * | 1987-06-01 | 1988-12-09 | Hitachi Ltd | Turbine governor warming device |
-
1991
- 1991-02-16 JP JP3022442A patent/JP2953794B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04262005A (en) | 1992-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6238524B2 (en) | ||
| JPH0454802B2 (en) | ||
| JP2953794B2 (en) | Steam control valve chest warming method | |
| JP2633720B2 (en) | Pre-warming method for steam turbine | |
| JPH09177505A (en) | A method and apparatus for controlling warming and cooling steam of steam turbine | |
| JP2674263B2 (en) | Control method for reheat steam turbine | |
| JPS6239646B2 (en) | ||
| JP3144512B2 (en) | Operation control method for reheated steam turbine | |
| JPH0450403A (en) | Warming method for governing valve | |
| JP2872739B2 (en) | Steam turbine start-up method and apparatus | |
| JPS62237009A (en) | Steam valve for steam turbine | |
| JPS62324B2 (en) | ||
| JPS58192908A (en) | Control device of combined cycle turbine plant | |
| JPS6198908A (en) | Steam turbine device | |
| JPS642762B2 (en) | ||
| JPH0330687B2 (en) | ||
| JPS63162907A (en) | Control for combined power generation plant | |
| JPS63179102A (en) | Warming method for steam turbine | |
| JPS61123702A (en) | Warming apparatus for main steam control valve | |
| JPS60228711A (en) | Turbine bypass control device for combined cycle electric power plant | |
| JPS60164606A (en) | Piping warming up control device | |
| JPH02130202A (en) | Combined plant | |
| JPH108912A (en) | Turbine bypass valve control device | |
| JPS5817330B2 (en) | High pressure turbine rotating shaft cooling method | |
| JPH05222903A (en) | Steam governing valve chest warming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080716 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090716 Year of fee payment: 10 |
|
| LAPS | Cancellation because of no payment of annual fees |