JPH0245087B2 - SAINETSUJOKIONDOSEIGYOSOCHI - Google Patents
SAINETSUJOKIONDOSEIGYOSOCHIInfo
- Publication number
- JPH0245087B2 JPH0245087B2 JP11936081A JP11936081A JPH0245087B2 JP H0245087 B2 JPH0245087 B2 JP H0245087B2 JP 11936081 A JP11936081 A JP 11936081A JP 11936081 A JP11936081 A JP 11936081A JP H0245087 B2 JPH0245087 B2 JP H0245087B2
- Authority
- JP
- Japan
- Prior art keywords
- steam temperature
- compensator
- reheater
- signal
- output
- 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 - Lifetime
Links
- 239000007921 spray Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 7
- 239000000567 combustion gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012892 rational function Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Combustion (AREA)
- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】
本発明はボイラの再熱器出口蒸気温度を制御す
る装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the steam temperature at the outlet of a boiler reheater.
従来のボイラは、第１図に示すように、燃料９
および空気１０が供給されるボイラ１がある。ボ
イラ１内の燃焼により発熱された熱量はボイラ１
の各伝熱部に吸収されるが、その伝熱部の一部と
して過熱器１１および再熱器２がある。再熱器２
については燃焼ガス量１２の多少により燃焼ガス
からの吸収熱量が違うことを利用して、再熱器２
の出口蒸気温度量３を制御するような構成として
おり、燃焼ガス量１２の調節にはガス再循環フア
ン１３の上流側に設置したガス再循環フアンの入
口ダンパ４が使用される。なお、過熱器１１で発
生された蒸気は、ガバナ弁１９を通り、高圧ター
ビン２０で仕事をし、排気が再熱器２に入り、再
熱器２で温度上昇された蒸気が低圧タービンに入
るようになつている。 As shown in Fig. 1, the conventional boiler uses fuel 9
and a boiler 1 to which air 10 is supplied. The amount of heat generated by combustion in boiler 1 is
The heat is absorbed into each of the heat transfer parts, and there are a superheater 11 and a reheater 2 as part of the heat transfer parts. Reheater 2
Regarding the reheater 2, taking advantage of the fact that the amount of heat absorbed from the combustion gas differs depending on the amount of combustion gas 12,
The inlet damper 4 of the gas recirculation fan installed upstream of the gas recirculation fan 13 is used to adjust the combustion gas amount 12. Note that the steam generated in the superheater 11 passes through the governor valve 19 and works in the high-pressure turbine 20, the exhaust gas enters the reheater 2, and the steam whose temperature has been raised in the reheater 2 enters the low-pressure turbine. It's becoming like that.
この第１図の構成においては、通常運転時の制
御系統と危急用制御系統との２つの系統が示され
ている。通常運転時の制御系統は、ガス再循環フ
アンの入口ダンパ４を制御する系統であつて、こ
の入口ダンパ４は駆動装置１４によつて駆動さ
れ、駆動装置１４は調節器１５の出力を受け、調
節器１５は再熱器２の出口蒸気温度３と設定値５
とを減算器１６で減算した信号を受けるようにし
ている。一方危急用制御系統はスプレイ弁７を制
御する系統であつて、減算器１６の出力と＋αの
設定器とを加算器１７で加算し、加算器１７を出
力を調節器１８で受けて、この調節器１８の出力
によつてスプレイ弁７を駆動するようにしてい
る。このように、再熱器２の出口蒸気温度３の制
御において、常時はスプレイ８は零としてガス再
循環フアン１３の入口ダンパ４を制御し、危急時
のみスプレイ８を飛ばして再熱器出口蒸気温度の
上昇を抑えている。これはスプレイを飛ばすこと
によるプラントの熱効率の低下を防ぐためであ
る。しかし、この制御方法では設定値５に＋αの
設定値を加えた値以上に再熱器出口蒸気温度が上
昇しないとスプレイ８が飛ばないため、温度上昇
時の上昇幅が大きいといつた欠点をを有してい
る。 In the configuration of FIG. 1, two systems are shown: a control system for normal operation and an emergency control system. The control system during normal operation is a system for controlling the inlet damper 4 of the gas recirculation fan, and the inlet damper 4 is driven by a drive device 14 which receives the output of a regulator 15. The regulator 15 controls the outlet steam temperature 3 of the reheater 2 and the set value 5.
A subtracter 16 subtracts the signal and receives the signal. On the other hand, the emergency control system is a system for controlling the spray valve 7, in which the output of the subtracter 16 and the +α setter are added together in an adder 17, the output of the adder 17 is received by a regulator 18, and this The spray valve 7 is driven by the output of the regulator 18. In this way, in controlling the outlet steam temperature 3 of the reheater 2, the spray 8 is normally set to zero and the inlet damper 4 of the gas recirculation fan 13 is controlled, and only in an emergency, the spray 8 is skipped to reduce the reheater outlet steam. It suppresses the rise in temperature. This is to prevent the thermal efficiency of the plant from decreasing due to spraying. However, with this control method, the spray 8 will not fly unless the reheater outlet steam temperature rises above the set value 5 plus the +α set value, so it has the disadvantage that the rise width when the temperature rises is large. have.
本発明は、上記のように負荷変動時の再熱器出
口蒸気温度の変動幅が大きいことにかんがみて、
より制御性能を改善した再熱蒸気温度制御装置を
目的とする。 In view of the large fluctuation range of the reheater outlet steam temperature during load fluctuations as described above, the present invention provides:
The objective is to provide a reheat steam temperature control device with improved control performance.
本発明によれば、設定値を負荷変動中のみ修正
し、本来の設定値からの蒸気温度の変動を抑える
ようにしている。 According to the present invention, the set value is corrected only during load fluctuations to suppress fluctuations in steam temperature from the original set value.
以下第２図に例示した本発明の好適な実施例に
ついて詳述する。 A preferred embodiment of the present invention illustrated in FIG. 2 will be described in detail below.
第２図において、従来例の第１図と同じ機能の
要素は同一の参照符号にて示してある。第２図に
おいては、本発明により追加した系統のみを説明
する。 In FIG. 2, elements having the same functions as in FIG. 1 of the conventional example are indicated by the same reference numerals. In FIG. 2, only the systems added according to the present invention will be explained.
第２図の符号１７′は第１の加算器１７の入力
端を１個増設した加算器で補償器２２の出力をこ
の増設した端子に受ける。補償器２２は要求負荷
信号２３を微分器２４で微分した信号を受ける。
なお、補償器２２の機能は以下の有理関数で表わ
されるものである。 Reference numeral 17' in FIG. 2 denotes an adder having one input terminal added to the first adder 17, and receives the output of the compensator 22 at this added terminal. The compensator 22 receives a signal obtained by differentiating the required load signal 23 with a differentiator 24 .
Note that the function of the compensator 22 is expressed by the following rational function.
a0＋a1s＋a2s2／b0＋b1s＋b2s2 ここでｓはラプラス演算子を意味する。 a 0 +a 1 s +a 2 s 2 /b 0 +b 1 s +b 2 s 2Here , s means the Laplace operator.
一例として、補償器２２のa1，a2，b2がそれぞ
れ零で、a0が負の値、およびb0，b1ともに正の値
で補償する場合の作用を述べる。このように値を
設定した根拠は、負荷上昇時に再熱器２の出口蒸
気温度３が大幅に上昇する場合を想定した場合で
あつて、仮に逆に出口蒸気温度３が大幅に減少す
る場合はa0を正の値にする。また、a1，a2および
b2については補償する場合のタイミングをずら
せ、温度の変動幅を抑えるために調整できるよう
に設けたものである。 As an example, the operation will be described in the case where a 1 , a 2 and b 2 of the compensator 22 are each zero, a 0 is a negative value, and b 0 and b 1 are both positive values. The reason for setting the value in this way is to assume that the outlet steam temperature 3 of the reheater 2 will increase significantly when the load increases, and if the outlet steam temperature 3 decreases significantly, a Set 0 to a positive value. Also, a 1 , a 2 and
Regarding b 2 , the timing for compensation is shifted so that it can be adjusted to suppress the range of temperature fluctuation.
まず、負荷要求２３が、第３図に示すように、
t1の時点で減少しだすと、微分器２４の出力は負
の方向に出力され、補償器２２の出力は遅れとa0
の利得が付加されて第３図ハの左側に示すような
信号となる。この信号は加算器１７′の入力とな
り、設定値を増加させる方向に働き、スプレイ弁
を閉じる方向に作用する。第３図に示すような負
荷運用時は通常、スプレイ弁７を全閉にしてある
ため、全閉状態を維持することになる。 First, the load request 23 is as shown in FIG.
When it starts to decrease at time t 1 , the output of the differentiator 24 is output in the negative direction, and the output of the compensator 22 is delayed and a 0
A gain of 1 is added, resulting in a signal as shown on the left side of FIG. 3C. This signal becomes an input to adder 17' and acts in the direction of increasing the set value and in the direction of closing the spray valve. During load operation as shown in FIG. 3, the spray valve 7 is normally fully closed, so it remains fully closed.
またt2の時点で負荷が増加し始めると微分器２
４の出力は正の方向に出力され、補償器２２の出
力も同様に遅れとa0の利得が付加され、第３図ハ
の右側に示すような信号となる。この信号は加算
器１７′の入力となり、負荷増加後早い時点でス
プレイ弁７を開ける方向に作用し、再熱器２の出
口蒸気温度３を抑える方向に作用する。なお、負
荷の増加および減少状態が止まると、第３図ハに
示すように、補償器２２の出力は零となる。 Also, when the load starts to increase at time t 2 , the differentiator 2
The output of 4 is output in the positive direction, and the output of the compensator 22 is similarly added with a delay and a gain of a0 , resulting in a signal as shown on the right side of FIG. 3C. This signal becomes an input to the adder 17' and acts in the direction of opening the spray valve 7 at an early point after the load increase, and acts in the direction of suppressing the outlet steam temperature 3 of the reheater 2. Note that when the load stops increasing and decreasing, the output of the compensator 22 becomes zero, as shown in FIG. 3C.
負荷増加時に再熱器２の出口蒸気温度３が大幅
に上昇しようとする場合、本発明によれば、従来
の＋αの設定値に負の値が補償器２２から出力さ
れるため、温度上昇が設定値より＋α高くなる前
にスプレイ８が飛んで蒸気温度の上昇を抑えるこ
とができる。また負荷変動がない状態になれば、
補償器２２の出力は零となり、従来の制御の利点
もそのまま生かされることになる。なお、本例で
は再熱器出口蒸気温度の通常運転時の操作量とし
て、ガス再循環フアンの入口ダンパを取上げてい
るが、他の操作量であつても同様の効果が得られ
る。 When the outlet steam temperature 3 of the reheater 2 is about to rise significantly when the load increases, according to the present invention, a negative value is output from the compensator 22 in addition to the conventional set value of +α, so that the temperature rise can be prevented. The spray 8 flies off before the steam temperature rises by +α higher than the set value, making it possible to suppress the rise in steam temperature. Also, if there is no load fluctuation,
The output of the compensator 22 becomes zero, and the advantages of conventional control can be utilized as is. In this example, the inlet damper of the gas recirculation fan is used as the manipulated variable for the reheater outlet steam temperature during normal operation, but the same effect can be obtained with other manipulated variables.
第１図は従来のボイラの再熱蒸気温度制御装置
を例示するブロツク図、第２図は本発明による再
熱蒸気温度制御装置を示すブロツク図、第３図は
第２図の装置の動作を説明するための信号波形図
である。
１……ボイラ、２……再熱器、３……出口蒸気
温度、４……入口ダンパ、５……設定値、６……
設定器、７……スプレイ弁、８……スプレイ、９
……燃料、１０……空気、１１……過熱器、１２
……燃焼ガス量、１３……ガス再循環フアン、１
４……駆動装置、１５……調節器、１６……減算
器、１７……加算器、１８……調節器、１９……
ガバナ弁、２０……高圧タービン、２１……低圧
タービン、２２……補償器、２３……要求負荷信
号、２４……微分器。
FIG. 1 is a block diagram illustrating a conventional boiler reheat steam temperature control device, FIG. 2 is a block diagram illustrating a reheat steam temperature control device according to the present invention, and FIG. 3 illustrates the operation of the device shown in FIG. It is a signal waveform diagram for explanation. 1... Boiler, 2... Reheater, 3... Outlet steam temperature, 4... Inlet damper, 5... Set value, 6...
Setting device, 7...Spray valve, 8...Spray, 9
... Fuel, 10 ... Air, 11 ... Superheater, 12
...Amount of combustion gas, 13 ...Gas recirculation fan, 1
4...Drive device, 15...Adjuster, 16...Subtractor, 17...Adder, 18...Adjuster, 19...
Governor valve, 20... High pressure turbine, 21... Low pressure turbine, 22... Compensator, 23... Demand load signal, 24... Differentiator.
Claims (1)
う制御し大きな負荷変動の危急時にはスプレイを
使用して大幅な温度上昇を抑えるよう制御するボ
イラの再熱蒸気温度制御装置において、要求負荷
信号を入力して微分する微分器とこの微分器の出
力信号を負の予め定めた利得の信号とする補償器
とを備え、この補償器の出力信号値をスプレイ用
温度設定値に加算するようにしたことを特徴とす
る再熱蒸気温度制御装置。1 Input the required load signal to the boiler reheat steam temperature control device, which controls the temperature to the set value using appropriate means during normal operation, and uses spray to suppress a significant temperature rise in the event of a large load fluctuation. and a compensator that converts the output signal of this differentiator into a signal with a negative predetermined gain, and the output signal value of this compensator is added to the temperature setting value for spraying. A reheat steam temperature control device featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11936081A JPH0245087B2 (en) | 1981-07-31 | 1981-07-31 | SAINETSUJOKIONDOSEIGYOSOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11936081A JPH0245087B2 (en) | 1981-07-31 | 1981-07-31 | SAINETSUJOKIONDOSEIGYOSOCHI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5822808A JPS5822808A (en) | 1983-02-10 |
| JPH0245087B2 true JPH0245087B2 (en) | 1990-10-08 |
Family
ID=14759561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11936081A Expired - Lifetime JPH0245087B2 (en) | 1981-07-31 | 1981-07-31 | SAINETSUJOKIONDOSEIGYOSOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0245087B2 (en) |
-
1981
- 1981-07-31 JP JP11936081A patent/JPH0245087B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5822808A (en) | 1983-02-10 |
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