JP3689928B2 - Gas damper control device for boiler rear transmission - Google Patents

Gas damper control device for boiler rear transmission Download PDF

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JP3689928B2
JP3689928B2 JP08814395A JP8814395A JP3689928B2 JP 3689928 B2 JP3689928 B2 JP 3689928B2 JP 08814395 A JP08814395 A JP 08814395A JP 8814395 A JP8814395 A JP 8814395A JP 3689928 B2 JP3689928 B2 JP 3689928B2
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damper
superheater
reheater
gas
opening
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JPH08285215A (en
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彰 高見
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石川島播磨重工業株式会社
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Description

【０００１】
【産業上の利用分野】
本発明はボイラ後伝部のガスダンパ制御装置に関するものである。
【０００２】
【従来の技術】
図３は、従来のボイラの一例を示したもので、バーナ２を備えて燃焼を行うボイラ本体１の後部に、上端が前記ボイラ本体１の上部に連通して下方に延設されたボイラ後伝部（後部伝熱部）３が設けてあり、該ボイラ後伝部３内には伝熱管により形成さた中間仕切壁４が設けられて、再熱器５（ＲＨ）が収容された前側の再熱器側ガス通路６と、過熱器７（ＳＨ）が収容された後側の過熱器側ガス通路８とに区画されており、前記ボイラ本体１に備えられたバーナ２の燃焼によって生じた排ガス９は、前記再熱器側ガス通路６と過熱器側ガス通路８の両方に分れて導かれるようになっている。
【０００３】
前記再熱器側ガス通路６における再熱器５の下部には再熱器ガスダンパ１０が備えてあり、また過熱器側ガス通路８における過熱器７の下部には過熱器ガスダンパ１１が備えてあり、前記再熱器ガスダンパ１０にはその開度を調節するための再熱器ダンパ操作器１２が設けられ、前記過熱器ガスダンパ１１にはその開度を調節するための過熱器ダンパ操作器１３が設けられている。
【０００４】
再熱器ガスダンパ１０と過熱器ガスダンパ１１の下側には節炭器１４が設けられていて、該節炭器１４を通った排ガス９は排ガスダクト１５により下流に導かれるようになっている。
【０００５】
１６は開度指令制御器であり、該開度指令制御器１６は、ボイラ負荷指令１７に基づいた再熱器ダンパ開度指令１８を前記再熱器ダンパ操作器１２に出力するようになっており、また、前記開度指令制御器１６からの再熱器ダンパ開度指令１８を入力して該再熱器ダンパ開度指令１８に対して図４に線Ａで示すように反比例のダンパ開度になるように前記過熱器ダンパ操作器１３に過熱器ダンパ開度指令１９を出力する関数発生器２０が備えてある。即ち、上記により、再熱器ダンパ開度が１００％の時の過熱器ダンパ開度は０％、再熱器ダンパ開度が０％の時の過熱器ダンパ開度は１００％、再熱器ダンパ開度が５０％の時の過熱器ダンパ開度は５０％となるように調節される。
【０００６】
前記節炭器１４には蒸気発生のための水が供給されており、この水がボイラ本体１の炉壁管等を通って蒸気となり、この蒸気が図５に矢印２１で示すように過熱器７に導入されている。
【０００７】
過熱器７にて過熱された蒸気は、吊り下げ型等の第２の過熱器２２及び第３の過熱器２３に順次導かれると共に、前記第２の過熱器２２及び第３の過熱器２３の各入側に設けられた注水弁２４を有する注水装置２５，２６の注水によって蒸気温度が調節された後、高圧の蒸気タービン２７に導かれて発電機２８を駆動し、更に前記高圧の蒸気タービン２７から出た蒸気は、前記再熱器５に導かれて加熱された後、中圧或いは低圧の蒸気タービン２９に導かれて発電機３０を駆動するようになっている。
【０００８】
前記したように、過熱器７を出て第２の過熱器２２及び第３の過熱器２３を通って高圧の蒸気タービン２７に供給される蒸気は注水装置２５，２６によって温度が調節されるようになっているのに対し、再熱器５から出た蒸気はそのまま直接中圧或いは低圧の蒸気タービン２９に供給されるようになっており、この中圧或いは低圧の蒸気タービン２９に供給される蒸気の温度は、再熱器側ガス通路６を流れる排ガス９の流量を調節することによって制御している。
【０００９】
即ち、図３に示しているように、ボイラ負荷指令１７に基づいて開度指令制御器１６から出力されている再熱器ダンパ開度指令１８によって、再熱器ダンパ操作器１２を介して再熱器ガスダンパ１０の開度を主体に制御し、これにより前記中圧或いは低圧の蒸気タービン２９に供給される蒸気の温度を制御している。この時、過熱器ガスダンパ１１は、関数発生器２０によりその開度が再熱器ガスダンパ１０の開度と反比例の関係に制御され、従って前記再熱器側ガス通路６に流れた残りの排ガス９が過熱器側ガス通路８に流されるようになる。
【００１０】
【発明が解決しようとする課題】
しかし、前記従来装置では、再熱器ガスダンパ１０と過熱器ガスダンパ１１は常に図４に線Ａで示すように反比例の開度になるように制御されているため、ボイラの負荷が高い時と低い時ではダンパゲイン（ダンパ開度による排ガス流量への効き具合）が大きく変化し、再熱器出口蒸気温度の制御性が悪化してしまう問題を有していた。
【００１１】
即ち、ボイラ負荷が高い場合は排ガス９の流量が多いために、前記再熱器ガスダンパ１０と過熱器ガスダンパ１１の開度を僅かに変化させた場合でも、再熱器側ガス通路６と過熱器側ガス通路８に流れる排ガス９の流量を敏感に制御することができるが、ボイラ負荷が低い場合は排ガス９の流量が少ないために、前記再熱器ガスダンパ１０と過熱器ガスダンパ１１の開度を少しくらい変化させても、再熱器側ガス通路６と過熱器側ガス通路８に流れる排ガス９の流量は殆んど変化せず、このように応答性が悪いために再熱器５出口の蒸気温度が不安定になりやすいという問題を有していた。
【００１２】
本発明は、斯かる従来の問題点に鑑みてなしたもので、ボイラ負荷が低いときの再熱器ガスダンパと過熱器ガスダンパによる排ガス流量制御の応答性を高めることができるボイラ後伝部のガスダンパ制御装置を提供することを目的としている。
【００１３】
【課題を解決するための手段】
本発明は、ボイラ後伝部の再熱器側ガス通路に配設された再熱器ガスダンパと、
ボイラ後伝部の過熱器側ガス通路に配設された過熱器ガスダンパと、
前記再熱器ガスダンパの開度を調節する再熱器ダンパ操作器と、
前記過熱器ガスダンパの開度を調節する過熱器ダンパ操作器と、
ボイラ負荷指令に基づいた再熱器ダンパ開度指令を前記再熱器ダンパ操作器に出力する開度指令制御器と、
該開度指令制御器からの再熱器ダンパ開度指令を入力して該再熱器ダンパ開度指令に対して反比例の過熱器ダンパ開度指令を前記過熱器ダンパ操作器に出力する関数発生器とを備えたボイラ後伝部のガスダンパ制御装置であって、
ボイラ負荷指令を入力してボイラ負荷指令が低い時に減算信号を出力する減算信号発生器と、
該減算信号発生器からの減算信号を前記過熱器ダンパ開度指令から引算し引算した結果の信号３４を過熱器ダンパ操作器に出力する引算器とを備えたことを特徴とするボイラ後伝部のガスダンパ制御装置、に係るものである。
【００１４】
【作用】
本発明によれば、ボイラ負荷指令が低下すると、ボイラ負荷指令に応じて、過熱器ガスダンパの開度を制御している過熱器ダンパ開度指令から所要のバイアス量の減算信号を引算するようにしているので、ボイラ負荷指令が低下した時のダンパの全体開度が絞られるように制御されることになり、よってボイラ負荷指令の低下によりボイラ後伝部を流れる排ガス流量が減少しても、再熱器ガスダンパ及び過熱器ガスダンパの開度を変化させた時の排ガス流量変化の応答性を高めることができる。これにより、再熱器出口の蒸気温度を安定させて的確に制御することができる。
【００１５】
【実施例】
以下、本発明の実施例を図面を参照しつつ説明する。
【００１６】
図１は、前記図３の従来のボイラ後伝部のガスダンパ制御装置に適用した本発明の一実施例を示すもので、図中同一の符号を付したものは同一物を表わしている。
【００１７】
図１に示すように、再熱器側ガス通路６における再熱器５の下部には再熱器ガスダンパ１０が備えてあり、また過熱器側ガス通路８における過熱器７の下部には過熱器ガスダンパ１１が備えてあり、前記再熱器ガスダンパ１０にはその開度を調節するための再熱器ダンパ操作器１２が設けられ、前記過熱器ガスダンパ１１にはその開度を調節するための過熱器ダンパ操作器１３が設けられている。
【００１８】
開度指令制御器１６にはボイラ負荷指令１７が入力されていて、開度指令制御器１６は、前記再熱器ガスダンパ１０の開度がボイラ負荷指令１７に基づいた開度になるように再熱器ダンパ開度指令１８を前記再熱器ダンパ操作器１２に出力するようになっており、また、前記開度指令制御器１６からの再熱器ダンパ開度指令１８が関数発生器２０に入力されていて、該関数発生器２０は、図４に線Ａで示すように前記再熱器ダンパ開度指令１８に対して反比例の過熱器ダンパ開度指令１９を前記過熱器ダンパ操作器１３に出力するようになっている。
【００１９】
上記構成において、前記ボイラ負荷指令１７を入力して該ボイラ負荷指令１７が低い時に減算信号３１を出力する減算信号発生器３２を新たに設置し、且つ該減算信号発生器３２からの減算信号３１を入力し、前記関数発生器２０から過熱器ダンパ操作器１３に出力されている過熱器ダンパ開度指令１９から減算信号３１を引算し、引算した結果の信号３４を過熱器ダンパ操作器１３に出力する引算器３３を備える。
【００２０】
前記減算信号発生器３２は、図２に示すように、ボイラ負荷指令が定格（１００％）に対して５０％以下の時には例えば１５％のバイアス量を出力し、ボイラ負荷指令が５０％以上では前記バイアス量が１５％から徐々に減少して、ボイラ負荷指令が９０％の時にバイアス量が０になる減算信号３１を出力するようになっている。この減算信号３１は種々の大きさに設定することができる。
【００２１】
次に上記実施例の作用を説明する。
【００２２】
開度指令制御器１６は、ボイラ負荷指令１７に基づいた再熱器ダンパ開度指令１８を前記再熱器ダンパ操作器１２に出力し、また、前記開度指令制御器１６からの再熱器ダンパ開度指令１８が関数発生器２０に入力されて、該関数発生器２０により、図４に線Ａで示すように前記再熱器ダンパ開度指令１８に対して反比例のダンパ開度になるようにした過熱器ダンパ開度指令１９が過熱器ダンパ操作器１３に出力される。
【００２３】
この時、ボイラ負荷指令１７が９０％以上であれば、図２に示すように減算信号発生器３２からの出力が無いので、前記再熱器ダンパ開度が１００％の時の過熱器ダンパ開度は０％、再熱器ダンパ開度が０％の時の過熱器ダンパ開度は１００％、再熱器ダンパ開度が５０％の時の過熱器ダンパ開度は５０％となる反比例の関係に制御される。
【００２４】
ボイラ負荷指令１７が９０％より低下してくると、減算信号発生器３２は、前記ボイラ負荷指令１７に応じて図２に示すように所定パーセントのバイアス量の減算信号３１を出力するようになり、ボイラ負荷指令１７が５０％以下では１５％のバイアス量の減算信号３１を出力する。
【００２５】
前記減算信号発生器３２からの減算信号３１は引算器３３に入力されており、従って引算器３３にて関数発生器２０からの過熱器ダンパ開度指令１９から減算信号３１が引算され、この引算された結果の信号３４が過熱器ダンパ操作器１３に出力されて過熱器ガスダンパ１１の開度が閉じる方向に調節される。
【００２６】
上記により、再熱器ガスダンパ１０及び過熱器ガスダンパ１１の全体開度が小さくなる（最大で１５％減少）ように制御されることになり、よってボイラ負荷指令１７が低下して排ガス９の全体流量が減少しても、再熱器ガスダンパ１０及び過熱器ガスダンパ１１の開度を変化させた時の排ガス流量変化の応答性を高めることができるようになり、従って再熱器５出口の蒸気温度を安定させて的確に制御することができるようになる。
【００２７】
【発明の効果】
本発明によれば、ボイラ負荷指令が低下すると、ボイラ負荷指令に応じて、過熱器ガスダンパの開度を制御している過熱器ダンパ開度指令から所要のバイアス量の減算信号を引算するようにしているので、ボイラ負荷指令が低下した時のダンパの全体開度を小さく絞ることになり、よってボイラ負荷指令の低下により排ガス流量が減少しても、再熱器ガスダンパ及び過熱器ガスダンパの開度を変化させた時の排ガス流量変化の応答性を高めることができて、再熱器出口の蒸気温度を安定させて的確に制御することができるという優れた効果を奏し得る。
【図面の簡単な説明】
【図１】本発明の一実施例を示すブロック系統図である。
【図２】減算信号発生器の減算信号の一例を示す線図である。
【図３】従来のボイラ後伝部のガスダンパ制御装置の一例を示すブロック系統図である。
【図４】関数発生器の反比例の出力を説明するための線図である。
【図５】図３の装置の蒸気の流れを示す系統図である。
【符号の説明】
３ ボイラ後伝部
６ 再熱器側ガス通路
８ 過熱器側ガス通路
１０ 再熱器ガスダンパ
１１ 過熱器ガスダンパ
１２ 再熱器ダンパ操作器
１３ 過熱器ダンパ操作器
１６ 開度指令制御器
１７ ボイラ負荷指令
１８ 再熱器ダンパ開度指令
１９ 過熱器ダンパ開度指令
２０ 関数発生器
３１ 減算信号
３２ 減算信号発生器
３３ 引算器
３４ 引算した結果の信号[0001]
[Industrial application fields]
The present invention relates to a gas damper control device for a boiler rear transmission section.
[0002]
[Prior art]
FIG. 3 shows an example of a conventional boiler. After the boiler, the upper end of the boiler body 1 is provided with a burner 2 and burns, and the upper end communicates with the upper portion of the boiler body 1 and extends downward. A heat transfer section (rear heat transfer section) 3 is provided, an intermediate partition wall 4 formed of a heat transfer tube is provided in the boiler rear transfer section 3, and the front side in which the reheater 5 (RH) is accommodated The reheater-side gas passage 6 and the rear-side superheater-side gas passage 8 in which the superheater 7 (SH) is accommodated are divided by combustion of the burner 2 provided in the boiler body 1. The exhaust gas 9 is divided and guided to both the reheater side gas passage 6 and the superheater side gas passage 8.
[0003]
A reheater gas damper 10 is provided below the reheater 5 in the reheater side gas passage 6, and a superheater gas damper 11 is provided below the superheater 7 in the superheater side gas passage 8. The reheater gas damper 10 is provided with a reheater damper operating device 12 for adjusting the opening thereof, and the superheater gas damper 11 is provided with a superheater damper operating device 13 for adjusting the opening. Is provided.
[0004]
A economizer 14 is provided below the reheater gas damper 10 and the superheater gas damper 11, and the exhaust gas 9 passing through the economizer 14 is guided downstream by an exhaust gas duct 15.
[0005]
Reference numeral 16 denotes an opening command controller, and the opening command controller 16 outputs a reheater damper opening command 18 based on the boiler load command 17 to the reheater damper operating device 12. In addition, a reheater damper opening command 18 from the opening command controller 16 is input, and an inversely proportional damper opening as shown by a line A in FIG. A function generator 20 for outputting a superheater damper opening command 19 to the superheater damper operating device 13 is provided so that the temperature becomes 20 degrees. That is, according to the above, when the reheater damper opening degree is 100%, the superheater damper opening degree is 0%, and when the reheater damper opening degree is 0%, the superheater damper opening degree is 100%. The superheater damper opening when the damper opening is 50% is adjusted to be 50%.
[0006]
Water for generating steam is supplied to the economizer 14, and this water passes through the furnace wall tube of the boiler body 1 and becomes steam, and this steam becomes superheater as shown by an arrow 21 in FIG. 7 is introduced.
[0007]
The steam superheated by the superheater 7 is sequentially led to a second superheater 22 and a third superheater 23 such as a hanging type, and at the same time, the second superheater 22 and the third superheater 23. After the steam temperature is adjusted by water injection by water injection devices 25 and 26 each having a water injection valve 24 provided on each inlet side, the steam is guided to a high-pressure steam turbine 27 to drive a generator 28, and further the high-pressure steam turbine. The steam emitted from 27 is guided to the reheater 5 and heated, and then guided to the intermediate or low pressure steam turbine 29 to drive the generator 30.
[0008]
As described above, the steam supplied from the superheater 7 to the high-pressure steam turbine 27 through the second superheater 22 and the third superheater 23 is adjusted by the water injection devices 25 and 26. In contrast, the steam discharged from the reheater 5 is directly supplied to the intermediate-pressure or low-pressure steam turbine 29 as it is, and is supplied to the intermediate-pressure or low-pressure steam turbine 29. The temperature of the steam is controlled by adjusting the flow rate of the exhaust gas 9 flowing through the reheater side gas passage 6.
[0009]
That is, as shown in FIG. 3, a reheater damper opening command 18 output from the opening command controller 16 on the basis of the boiler load command 17 is used to perform re-transmission via the reheater damper operating device 12. The opening degree of the heater gas damper 10 is mainly controlled, thereby controlling the temperature of the steam supplied to the intermediate or low pressure steam turbine 29. At this time, the opening degree of the superheater gas damper 11 is controlled by the function generator 20 so as to be inversely proportional to the opening degree of the reheater gas damper 10, and therefore, the remaining exhaust gas 9 flowing into the reheater side gas passage 6. Is caused to flow into the superheater side gas passage 8.
[0010]
[Problems to be solved by the invention]
However, in the conventional apparatus, the reheater gas damper 10 and the superheater gas damper 11 are always controlled to have an inversely proportional opening as shown by a line A in FIG. In some cases, the damper gain (effect on the exhaust gas flow rate by the damper opening degree) greatly changes, and the controllability of the reheater outlet steam temperature is deteriorated.
[0011]
That is, when the boiler load is high, the flow rate of the exhaust gas 9 is large. Therefore, even when the opening degree of the reheater gas damper 10 and the superheater gas damper 11 is slightly changed, the reheater side gas passage 6 and the superheater are changed. The flow rate of the exhaust gas 9 flowing through the side gas passage 8 can be controlled sensitively. However, when the boiler load is low, the flow rate of the exhaust gas 9 is small. Therefore, the opening degree of the reheater gas damper 10 and the superheater gas damper 11 is adjusted. Even if it is changed a little, the flow rate of the exhaust gas 9 flowing through the reheater side gas passage 6 and the superheater side gas passage 8 hardly changes. There was a problem that the steam temperature tends to become unstable.
[0012]
The present invention has been made in view of such conventional problems, and is a gas damper for a boiler rear transmission section that can improve the responsiveness of exhaust gas flow rate control by a reheater gas damper and a superheater gas damper when the boiler load is low. The object is to provide a control device.
[0013]
[Means for Solving the Problems]
The present invention provides a reheater gas damper disposed in a reheater side gas passage of a boiler rear transmission section,
A superheater gas damper disposed in the superheater side gas passage of the boiler rear transmission section;
A reheater damper operating device for adjusting the opening of the reheater gas damper;
A superheater damper operating device for adjusting the opening degree of the superheater gas damper;
An opening command controller for outputting a reheater damper opening command based on a boiler load command to the reheater damper operating device;
Generating a function for inputting a reheater damper opening command from the opening command controller and outputting a superheater damper opening command in inverse proportion to the reheater damper opening command to the superheater damper operating device A gas damper control device for a boiler rear transmission section equipped with a vessel,
A subtraction signal generator for inputting a boiler load command and outputting a subtraction signal when the boiler load command is low;
And a subtractor for subtracting a subtracted signal from the subtractor signal generator from the superheater damper opening command and outputting a subtracted signal 34 to the superheater damper operating device. The present invention relates to a gas damper control device for a rear transmission unit.
[0014]
[Action]
According to the present invention, when the boiler load command decreases, the subtraction signal for the required bias amount is subtracted from the superheater damper opening command that controls the opening of the superheater gas damper according to the boiler load command. Therefore, the overall opening of the damper is controlled to be reduced when the boiler load command is reduced. Therefore, even if the exhaust gas flow rate flowing through the boiler rear section is reduced due to the decrease in the boiler load command, The responsiveness of the exhaust gas flow rate change when the opening degree of the reheater gas damper and the superheater gas damper is changed can be enhanced. Thereby, the steam temperature at the outlet of the reheater can be stabilized and accurately controlled.
[0015]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
FIG. 1 shows one embodiment of the present invention applied to the conventional gas damper control device for the boiler rear transmission section shown in FIG. 3. In FIG. 1, the same reference numerals denote the same components.
[0017]
As shown in FIG. 1, a reheater gas damper 10 is provided below the reheater 5 in the reheater side gas passage 6, and a superheater is provided below the superheater 7 in the superheater side gas passage 8. A gas damper 11 is provided, the reheater gas damper 10 is provided with a reheater damper operating device 12 for adjusting the opening degree thereof, and the superheater gas damper 11 is overheated for adjusting the opening degree thereof. A damper damper operating device 13 is provided.
[0018]
A boiler load command 17 is input to the opening command controller 16, and the opening command controller 16 resets the reheater gas damper 10 so that the opening of the reheater gas damper 10 becomes an opening based on the boiler load command 17. The heater damper opening command 18 is output to the reheater damper operating device 12, and the reheater damper opening command 18 from the opening command controller 16 is sent to the function generator 20. The function generator 20 receives the superheater damper opening command 19 which is inversely proportional to the reheater damper opening command 18 as indicated by line A in FIG. To output.
[0019]
In the above-described configuration, a subtracting signal generator 32 that inputs the boiler load command 17 and outputs a subtraction signal 31 when the boiler load command 17 is low is newly installed, and the subtraction signal 31 from the subtraction signal generator 32 is provided. The subtracting signal 31 is subtracted from the superheater damper opening command 19 output from the function generator 20 to the superheater damper operating device 13, and the subtracted signal 34 is subtracted from the superheater damper operating device. 13 is provided.
[0020]
As shown in FIG. 2, the subtraction signal generator 32 outputs, for example, a bias amount of 15% when the boiler load command is 50% or less with respect to the rating (100%), and when the boiler load command is 50% or more. The bias amount gradually decreases from 15%, and when the boiler load command is 90%, a subtraction signal 31 that outputs a bias amount of 0 is output. This subtraction signal 31 can be set to various magnitudes.
[0021]
Next, the operation of the above embodiment will be described.
[0022]
The opening command controller 16 outputs a reheater damper opening command 18 based on the boiler load command 17 to the reheater damper operating device 12, and the reheater from the opening command controller 16. A damper opening command 18 is input to the function generator 20, and the function generator 20 makes the damper opening inversely proportional to the reheater damper opening command 18, as shown by line A in FIG. The superheater damper opening degree command 19 is output to the superheater damper operating device 13.
[0023]
At this time, if the boiler load command 17 is 90% or more, there is no output from the subtracting signal generator 32 as shown in FIG. 2, so that the superheater damper opening when the reheater damper opening is 100% is shown. Degree is 0%, reheater damper opening is 0%, superheater damper opening is 100%, reheater damper opening is 50%, superheater damper opening is 50% Controlled by relationship.
[0024]
When the boiler load command 17 falls below 90%, the subtraction signal generator 32 outputs a subtraction signal 31 with a predetermined percentage bias amount in accordance with the boiler load command 17 as shown in FIG. When the boiler load command 17 is 50% or less, a subtraction signal 31 with a bias amount of 15% is output.
[0025]
The subtraction signal 31 from the subtraction signal generator 32 is input to the subtractor 33, so that the subtraction signal 31 is subtracted from the superheater damper opening command 19 from the function generator 20 by the subtractor 33. The subtracted signal 34 is output to the superheater damper operating device 13 to adjust the opening degree of the superheater gas damper 11 in the closing direction.
[0026]
As a result, the overall opening of the reheater gas damper 10 and the superheater gas damper 11 is controlled to be small (a maximum reduction of 15%), so that the boiler load command 17 is reduced and the total flow rate of the exhaust gas 9 is reduced. However, the responsiveness of the exhaust gas flow rate change when the opening degree of the reheater gas damper 10 and the superheater gas damper 11 is changed can be improved, so that the steam temperature at the outlet of the reheater 5 can be increased. It becomes possible to stabilize and accurately control.
[0027]
【The invention's effect】
According to the present invention, when the boiler load command decreases, the subtraction signal for the required bias amount is subtracted from the superheater damper opening command that controls the opening of the superheater gas damper according to the boiler load command. As a result, the overall opening of the damper when the boiler load command is reduced is reduced to a small value.Therefore, even if the exhaust gas flow rate is reduced due to a decrease in the boiler load command, the reheater gas damper and superheater gas damper are opened. The responsiveness of the exhaust gas flow rate change when the degree is changed can be improved, and the excellent effect that the steam temperature at the outlet of the reheater can be stabilized and accurately controlled can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing an example of a subtraction signal of a subtraction signal generator.
FIG. 3 is a block system diagram showing an example of a conventional gas damper control device for a boiler rear transmission section.
FIG. 4 is a diagram for explaining an inversely proportional output of a function generator.
FIG. 5 is a system diagram showing the flow of steam in the apparatus of FIG. 3;
[Explanation of symbols]
3 Boiler rear transmission section 6 Reheater side gas passage 8 Superheater side gas passage 10 Reheater gas damper 11 Superheater gas damper 12 Reheater damper operator 13 Superheater damper operator 16 Opening command controller 17 Boiler load command 18 Reheater damper opening command 19 Superheater damper opening command 20 Function generator 31 Subtraction signal 32 Subtraction signal generator 33 Subtractor 34 Subtraction signal

Claims (1)

ボイラ後伝部の再熱器側ガス通路に配設された再熱器ガスダンパと、
ボイラ後伝部の過熱器側ガス通路に配設された過熱器ガスダンパと、
前記再熱器ガスダンパの開度を調節する再熱器ダンパ操作器と、
前記過熱器ガスダンパの開度を調節する過熱器ダンパ操作器と、
ボイラ負荷指令に基づいた再熱器ダンパ開度指令を前記再熱器ダンパ操作器に出力する開度指令制御器と、
該開度指令制御器からの再熱器ダンパ開度指令を入力して該再熱器ダンパ開度指令に対して反比例の過熱器ダンパ開度指令を前記過熱器ダンパ操作器に出力する関数発生器とを備えたボイラ後伝部のガスダンパ制御装置であって、
ボイラ負荷指令を入力してボイラ負荷指令が低い時に減算信号を出力する減算信号発生器と、
該減算信号発生器からの減算信号を前記過熱器ダンパ開度指令から引算し引算した結果の信号を過熱器ダンパ操作器に出力する引算器とを備えたことを特徴とするボイラ後伝部のガスダンパ制御装置。A reheater gas damper disposed in the gas passage on the reheater side of the boiler rear transmission section;
A superheater gas damper disposed in the superheater side gas passage of the boiler rear transmission section;
A reheater damper operating device for adjusting the opening of the reheater gas damper;
A superheater damper operating device for adjusting the opening degree of the superheater gas damper;
An opening command controller for outputting a reheater damper opening command based on a boiler load command to the reheater damper operating device;
Generating a function for inputting a reheater damper opening command from the opening command controller and outputting a superheater damper opening command in inverse proportion to the reheater damper opening command to the superheater damper operating device A gas damper control device for a boiler rear transmission section equipped with a vessel,
A subtraction signal generator for inputting a boiler load command and outputting a subtraction signal when the boiler load command is low;
A subtractor for subtracting a subtraction signal from the subtraction signal generator from the superheater damper opening command and outputting a subtraction signal to the superheater damper operating device; Gas damper control device for transmission.
JP08814395A 1995-04-13 1995-04-13 Gas damper control device for boiler rear transmission Expired - Fee Related JP3689928B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP08814395A JP3689928B2 (en) 1995-04-13 1995-04-13 Gas damper control device for boiler rear transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08814395A JP3689928B2 (en) 1995-04-13 1995-04-13 Gas damper control device for boiler rear transmission

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JPH08285215A JPH08285215A (en) 1996-11-01
JP3689928B2 true JP3689928B2 (en) 2005-08-31

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KR100411673B1 (en) * 1999-12-14 2003-12-18 주식회사 포스코 Circuit of controlling the boiler renounce gas and watery vapor temperature
CN103104907B (en) * 2013-01-31 2015-04-15 华北电力大学 Heating structure and heating method of boiler based on partitioned flue and multistage air preheating

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