JPH04342805A - Method of controlling pressure of exhaust gas from exhaust gas recombustion type combined cycle plant - Google Patents
Method of controlling pressure of exhaust gas from exhaust gas recombustion type combined cycle plantInfo
- Publication number
- JPH04342805A JPH04342805A JP14121791A JP14121791A JPH04342805A JP H04342805 A JPH04342805 A JP H04342805A JP 14121791 A JP14121791 A JP 14121791A JP 14121791 A JP14121791 A JP 14121791A JP H04342805 A JPH04342805 A JP H04342805A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- command signal
- signal
- draft fan
- pressure
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 12
- 239000007789 gas Substances 0.000 description 80
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
- F01K23/101—Regulating means specially adapted therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、排気再燃コンバインド
サイクルプラントの排ガス圧力制御方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling exhaust gas pressure in an exhaust gas reburning combined cycle plant.
【０００２】0002
【従来の技術】図３は、従来の排気再燃コンバインドサ
イクルプラントの一例を示すもので、スチ−ムタ−ビン
１を備えたボイラ２に、主流路３を介してガスタ−ビン
４が接続されていると共に、他のガスタービン４’が主
流路３’を介して接続され、更にボイラ空気の不足分を
導入する押込み通風機５が接続されており、且つ前記ボ
イラ２からの排ガスを脱硝装置６及び熱交換器７等を介
して誘引通風機８に導き、更に煙突９に導くようにして
いる。この場合の誘引通風機８は、ガスタ−ビン４の出
口ドラフトの制約（上限約７００ｍｍＡｑ程度を保持）
から設置するようにしている。2. Description of the Related Art FIG. 3 shows an example of a conventional exhaust gas reburning combined cycle plant, in which a gas turbine 4 is connected to a boiler 2 equipped with a steam turbine 1 via a main flow path 3. At the same time, another gas turbine 4' is connected via the main flow path 3', and a forced draft fan 5 for introducing the insufficient amount of boiler air is also connected, and the exhaust gas from the boiler 2 is transferred to a denitrification device 6. The air is guided to an induced draft fan 8 via a heat exchanger 7 and the like, and further to a chimney 9. In this case, the induced draft fan 8 is limited to the outlet draft of the gas turbine 4 (maintaining an upper limit of about 700 mmAq).
I am trying to install it from.
【０００３】前記ガスタ−ビン４，４’は、夫々同軸に
設けられた空気圧縮器１０により空気１１を吸い込んで
圧縮し、圧縮した空気１１を燃焼器１２に導いて燃料１
３を混合することにより燃焼させ、燃焼によって得られ
た燃焼ガスによって回転駆動されて発電機１４を回すよ
うになっている。ガスタービン４，４’からの排ガスは
ボイラ２に導かれ、ボイラ２には燃料１５が供給される
ようになっている。[0003] The gas turbines 4 and 4' suck air 11 and compress it using air compressors 10 provided coaxially with each other, and lead the compressed air 11 to a combustor 12 to produce fuel 1.
3 are mixed and combusted, and the combustion gas obtained by the combustion is rotationally driven to rotate the generator 14. Exhaust gas from the gas turbines 4, 4' is led to a boiler 2, and the boiler 2 is supplied with fuel 15.
【０００４】前記熱交換器７の入口部に圧力計１６を設
け、該圧力計１６からの検出圧力信号１７を引算器１８
に導くと共に、前記スチ−ムタ−ビン１の負荷信号１９
を関数変換器２０に導き該関数変換器２０によって得ら
れた負荷に対応した圧力信号２１を前記引算器１８に導
き、引算により求められた指令信号２２をコントロ−ラ
２３に導くことにより、誘引通風機８をスチ−ムタ−ビ
ン１の負荷に応じてプログラム制御するか、或いは前記
熱交換器７の入口部の圧力が一定圧力に保たれるように
一定圧力制御している。A pressure gauge 16 is provided at the inlet of the heat exchanger 7, and a detected pressure signal 17 from the pressure gauge 16 is sent to a subtracter 18.
and the load signal 19 of the steam turbine 1.
by guiding the pressure signal 21 corresponding to the load obtained by the function converter 20 to the subtracter 18, and guiding the command signal 22 obtained by the subtraction to the controller 23. The induced draft fan 8 is controlled by a program according to the load of the steam turbine 1, or the pressure at the inlet of the heat exchanger 7 is controlled to be constant so that the pressure is maintained at a constant pressure.
【０００５】また、図示の場合は、ボイラ２に対して２
台のガスタービン４，４’が接続され、その他に押込み
通風機５が接続された場合を示しているが、図３におい
て更に他のガスタービンが備えられたり、或いは押込み
通風機５を有しないで複数台のガスタービンのみが備え
られている場合もある。In addition, in the case shown in the figure, 2
Although the case is shown in which two gas turbines 4 and 4' are connected and a forced draft fan 5 is connected to the others, in FIG. In some cases, only multiple gas turbines are provided.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記し
たように、ボイラ２に対してガスタ−ビン４の他に、押
込み通風機５または他のガスタ−ビン４’を備えている
排気再燃コンバインドサイクルプラントにおいては、次
のような問題を有していた。However, as mentioned above, in an exhaust reburning combined cycle plant, the boiler 2 is equipped with a forced draft fan 5 or another gas turbine 4' in addition to the gas turbine 4. had the following problems.
【０００７】即ち、押込み通風機５或いは他のガスタ−
ビン４’の少なくとも１つが通常に作動している状態即
ち通常運転状態から、ガスタ−ビン４を新たに起動する
場合には、安定して起動させるためにガスタ−ビン４の
出口ドラフトを低く（０ｍｍＡｑまたは負圧）保持しな
ければならないが、従来の装置にて前記低圧を保持する
ためには、ボイラ２、脱硝装置６及び熱交換器７による
ドラフトロスが大きいために誘引通風機の容量を非常に
大きくして誘引力を増大させる必要が生じ、よって装置
が大型化する問題があると共に、ボイラ２に余分な負圧
を作用させてボイラ２を変形させてしまう危険性がある
。また、ガスタ−ビン４を停止するときにも、ガスタ−
ビン４を安定して停止させるためにガスタービン出口ド
ラフトを低く保持する必要があり、この場合にも同様の
問題を有していた。That is, the forced draft fan 5 or other gas
When restarting the gas turbine 4 from a state in which at least one of the bins 4' is normally operating, that is, from a normal operating state, the outlet draft of the gas turbine 4 should be set low ( 0 mmAq or negative pressure), but in order to maintain the above low pressure with conventional equipment, the capacity of the induced draft fan must be It becomes necessary to increase the attracting force by making it very large, which causes the problem of increasing the size of the device, and there is also a risk that excessive negative pressure will be applied to the boiler 2 and the boiler 2 will be deformed. Also, when stopping the gas turbine 4, the gas turbine
In order to stop the bin 4 stably, it is necessary to keep the gas turbine outlet draft low, and this case also has the same problem.
【０００８】本発明は、上述の実情に鑑みてなしたもの
で、必要最小限の容量の誘引通風機によりガスタ−ビン
出口のドラフトを小さく保持して、ガスタ−ビンの起動
・停止を安定して行なわせることができる排気再燃コン
バインドサイクルプラントの排ガス圧力制御方法を提供
することを目的とする。The present invention has been made in view of the above-mentioned circumstances, and it is possible to stabilize the starting and stopping of the gas turbine by keeping the draft at the gas turbine outlet small by using an induced draft fan with the minimum necessary capacity. It is an object of the present invention to provide a method for controlling exhaust gas pressure in an exhaust gas reburning combined cycle plant.
【０００９】[0009]
【課題を解決するための手段】本発明は、スチ−ムタ−
ビンを備えたボイラに、主流路を介してガスタ−ビンが
接続されていると共に、押込み通風機或いは所要数の他
のガスタービンの少なくとも一方が接続されており、且
つ前記ボイラからの排ガスが脱硝装置及び熱交換器等を
介して誘引通風機に導かれるように構成してある排気再
燃コンバインドサイクルプラントの排ガス圧力制御方法
であって、前記ガスタ−ビンからの主流路の排ガスを前
記ボイラを迂回するバイパス管により脱硝装置入口部に
導き得るようにし、前記熱交換器の入口部に第一の圧力
計を備えて該第一の圧力計からの検出圧力信号と、前記
スチ−ムタ−ビンの負荷信号を関数変換器に導いて得ら
れる負荷に応じた圧力信号とを第一の引算器に導いて引
算し、引算により得られた通常時指令信号を切替器に導
き、前記脱硝装置の入口部に第二の圧力計を備えて該第
二の圧力計からの検出圧力信号と、設定ドラフト信号と
を第二の引算器に導いて引算し、得られた特殊運転時指
令信号を前記切替器に導き、該切替器により前記通常時
指令信号と特殊運転時指令信号を切り替えて誘引通風機
のコントロ−ラに導くようにし、通常運転時には切替器
により前記通常指令信号をコントロ−ラに導き誘引通風
機をスチ−ムタ−ビンの負荷に応じて制御し、またガス
タ−ビンの起動・停止などの特殊運転時にはガスタ−ビ
ンをバイパス管を介して脱硝装置入口部に連通させると
共に、切替器により前記特殊運転時指令信号をコントロ
−ラに導き脱硝装置入口部の圧力を低い一定値に保持す
るよう誘引通風機を制御することを特徴とする排気再燃
コンバインドサイクルプラントの排ガス圧力制御方法、
及び前記スチ−ムタ−ビンの負荷信号に応じて通常指令
信号を出力させることに替えて、通常時指令信号を設定
された一定値信号とすることを特徴とする排気再燃コン
バインドサイクルプラントの排ガス圧力制御方法、に係
るものである。[Means for Solving the Problems] The present invention provides a steam generator.
A gas turbine is connected to the boiler equipped with the boiler via a main flow path, and at least one of a forced draft fan or a required number of other gas turbines is connected, and the exhaust gas from the boiler is denitrified. A method for controlling exhaust gas pressure in an exhaust gas reburning combined cycle plant configured to be guided to an induced draft fan through a device, a heat exchanger, etc., the exhaust gas in the main flow path from the gas turbine bypassing the boiler. A first pressure gauge is provided at the inlet of the heat exchanger, and a detected pressure signal from the first pressure gauge is connected to the steam turbine. The load signal is guided to the function converter, and the pressure signal corresponding to the load obtained is guided to the first subtractor and subtracted, and the normal command signal obtained by the subtraction is guided to the switch, and the denitrification A second pressure gauge is provided at the inlet of the device, and the detected pressure signal from the second pressure gauge and the set draft signal are led to a second subtractor and subtracted, and the obtained special operation time signal is A command signal is guided to the switching device, and the switching device switches between the normal command signal and the special operation command signal and guides it to the controller of the induced draft fan.During normal operation, the switching device switches the normal command signal. The induced draft is guided to the controller and controlled according to the load on the steam turbine, and during special operations such as starting and stopping the gas turbine, the gas turbine is connected to the denitrification equipment inlet via a bypass pipe. At the same time, the special operation command signal is sent to a controller by a switch, and an induced draft fan is controlled to maintain the pressure at the inlet of the denitrification device at a low constant value. pressure control method,
and an exhaust gas pressure of an exhaust reburning combined cycle plant, characterized in that instead of outputting the normal command signal in accordance with the load signal of the steam turbine, the normal command signal is a set constant value signal. This relates to a control method.
【００１０】0010
【作用】押込み通風機またはガスタービンの少なくとも
１つが運転されている通常運転時には、切替器により通
常指令信号をコントロ−ラに導くことにより、誘引通風
機をスチ−ムタ−ビンの負荷に応じて制御するか、また
は一定値に設定された通常時指令信号により制御する。
このとき、ガスタービンが運転されている場合には運転
されているガスタービンからの排ガスは主流路を介して
ボイラに導かれる。[Operation] During normal operation when at least one of the forced draft fan or gas turbine is in operation, the induced draft fan is controlled according to the load of the steam turbine by guiding the normal command signal to the controller using the switch. control, or by a normal command signal set to a constant value. At this time, when the gas turbine is in operation, exhaust gas from the gas turbine in operation is guided to the boiler via the main flow path.
【００１１】上記したように、押込み通風機またはガス
タービンの少なくとも１つが運転されている通常運転状
態から、ガスタ−ビンを起動・停止する特殊運転時には
、起動・停止するガスタ−ビンをバイパス管を介して脱
硝装置の入口部に連通させ、且つ切替器により特殊運転
時指令信号をコントロ−ラに導くことにより、脱硝装置
入口部の圧力を低い一定値に保持するよう制御する。As mentioned above, during special operation in which the gas turbine is started or stopped from the normal operation state in which at least one of the forced draft fan or the gas turbine is in operation, the gas turbine to be started and stopped is connected to the bypass pipe. The pressure at the inlet of the denitrification device is controlled to be maintained at a low constant value by communicating with the inlet of the denitrification device through the denitrification device, and by guiding a special operation command signal to the controller using the switch.
【００１２】0012
【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。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
【００１３】図１は、本発明の一実施例を示すものであ
る。FIG. 1 shows an embodiment of the present invention.
【００１４】図１では、ボイラ２に主流路３を介してガ
スタ−ビン４が接続されていると共に、主流路３’を介
して他のガスタービン４’が接続されており、更に、押
込み通風機５が接続された場合を示しており、且つ前記
ボイラ２からの排ガスを脱硝装置６及び熱交換器７等を
介して誘引通風機８に導き、更に煙突９に導くようにし
ている。In FIG. 1, a gas turbine 4 is connected to the boiler 2 through a main flow path 3, and another gas turbine 4' is connected through the main flow path 3'. The exhaust gas from the boiler 2 is guided to an induced draft fan 8 via a denitrification device 6, a heat exchanger 7, etc., and further to a chimney 9.
【００１５】前記ガスタ−ビン４からの主流路３に、ボ
イラ２を迂回して排ガスを脱硝装置６の入口部に導くバ
イパス管２４を設け、且つ前記主流路３及びバイパス管
２４の夫々に切り替え弁２５，２６を備える。また前記
他のガスタービン４’からの主流路３’にも、ボイラ２
を迂回して排ガスを脱硝装置６の入口部に導くバイパス
管２４’を設け、且つ前記主流路３’及びバイパス管２
４’の夫々に切り替え弁２５’，２６’を備える。A bypass pipe 24 is provided in the main flow path 3 from the gas turbine 4 to bypass the boiler 2 and guide the exhaust gas to the inlet of the denitrification device 6, and the main flow path 3 and the bypass pipe 24 are switched to each other. Valves 25 and 26 are provided. A boiler 2 is also connected to the main passage 3' from the other gas turbine 4'.
A bypass pipe 24' is provided to guide the exhaust gas to the inlet of the denitrification device 6 by bypassing the main flow path 3' and the bypass pipe 2.
4' are provided with switching valves 25' and 26', respectively.
【００１６】また、前記熱交換器７の入口部に第一の圧
力計２７を備えて該第一の圧力計２７からの検出圧力信
号２８を第一の引算器２９に導くと共に、前記スチ−ム
タ−ビン１の負荷信号３０を関数変換器３１に導くこと
により負荷に応じた圧力信号３２として前記第一の引算
器２９に導き、両信号２８，３２を引算することにより
通常時指令信号３３を得、該通常時指令信号３３を切替
器３４に導くようにする。Furthermore, a first pressure gauge 27 is provided at the inlet of the heat exchanger 7, and the detected pressure signal 28 from the first pressure gauge 27 is guided to a first subtractor 29, and the - The load signal 30 of the multi-turbine 1 is guided to the function converter 31 to be led to the first subtractor 29 as a pressure signal 32 corresponding to the load, and both signals 28 and 32 are subtracted to produce a normal signal. A command signal 33 is obtained and the normal command signal 33 is guided to a switch 34.
【００１７】また、前記脱硝装置６の入口部に第二の圧
力計３５を備えて該第二の圧力計３５からの検出圧力信
号３６を第二の引算器３７に導くと共に、０ｍｍＡｑ或
いは負圧の低圧の設定ドラフト信号３８を前記第二の引
算器３７に導き、両信号３６，３８を引算することによ
り特殊運転時指令信号３９を得、該特殊運転時指令信号
３９を前記切替器３４に導くようにする。切替器３４か
らの通常時指令信号３３または特殊運転時指令信号３９
は、コントロ−ラ４０に導かれて誘引通風機８の制御を
行なうようになっている。Further, a second pressure gauge 35 is provided at the inlet of the denitrification device 6, and the detected pressure signal 36 from the second pressure gauge 35 is guided to a second subtractor 37, and the detected pressure signal 36 is outputted from the second pressure gauge 35 to a second subtractor 37. The low pressure setting draft signal 38 is guided to the second subtractor 37, and by subtracting both signals 36 and 38, a special operation command signal 39 is obtained, and the special operation command signal 39 is used to switch the special operation command signal 39 to the second subtractor 37. so as to lead it to the vessel 34. Normal time command signal 33 or special operation command signal 39 from the switch 34
is guided by the controller 40 to control the induced draft fan 8.
【００１８】上記実施例の作用を以下に説明する。The operation of the above embodiment will be explained below.
【００１９】押込み通風機５またはガスタービン４，４
’のうちの少なくとも１つが運転されている通常運転時
には、切替器３４により前記スチ−ムタ−ビン１の負荷
に応じた通常時指令信号３３がコントロ−ラ４０に導か
れて誘引通風機８が負荷に応じて制御される。このとき
、ガスタービン４，４’が停止されている場合には、夫
々のガスタービン４，４’に対応した主流路３，３’及
びバイパス流路２４，２４’の切り替え弁２５，２６，
２５’，２６’は閉じられている。Forced draft fan 5 or gas turbine 4,4
During normal operation in which at least one of the steam turbines Controlled according to load. At this time, when the gas turbines 4, 4' are stopped, the switching valves 25, 26,
25' and 26' are closed.
【００２０】例えば押込み通風機５のみが運転されてい
る通常運転状態から、ガスタ−ビン４を起動させる場合
の特殊運転時には、ガスタ−ビン４の排ガスをバイパス
管２４を介して脱硝装置６の入口部に導くように切り替
え弁２６を開くと共に、切替器３４により前記特殊運転
時指令信号３９をコントロ−ラ４０に導くことにより脱
硝装置６の入口部の圧力が低い一定値（０ｍｍＡｑ或い
は負圧）を保持するよう誘引通風機８を制御する。For example, during a special operation in which the gas turbine 4 is started from a normal operating state in which only the forced draft fan 5 is operated, the exhaust gas from the gas turbine 4 is passed through the bypass pipe 24 to the inlet of the denitrification device 6. At the same time, the switching valve 26 is opened so that the special operation command signal 39 is guided to the controller 40 by the switching device 34, so that the pressure at the inlet of the denitrification device 6 is kept at a low constant value (0 mmAq or negative pressure). The induced draft fan 8 is controlled to maintain the .
【００２１】上記によれば、誘引通風機８はボイラ２を
バイパスしてガスタ−ビン４の出側の排ガスを吸引する
ことになるので、ドラフトロスが大幅に減少し、よって
小さい容量の誘引通風機８でガスタ−ビン４の出側圧力
を十分小さく保持して、ガスタ−ビン４を確実且つ安定
して起動せることができる。According to the above, the induced draft fan 8 bypasses the boiler 2 and sucks the exhaust gas from the outlet side of the gas turbine 4, so the draft loss is significantly reduced, and therefore the induced draft fan 8 with a small capacity The pressure on the outlet side of the gas turbine 4 can be maintained at a sufficiently low level by the engine 8, so that the gas turbine 4 can be started up reliably and stably.
【００２２】ガスタービン４が起動したら切り替え弁２
５を開き切り替え弁２６を閉じてガスタービン４の排ガ
スを主流路３を介してボイラ２に導き、通常時指令信号
３３をコントローラ４０に導くように切替器３４を切り
替えることにより、押込み通風機５とガスタービン４が
運転された通常運転状態に切り替える。また、運転され
ているガスタ−ビン４を停止させる場合の特殊運転時に
も、前記起動させる場合の特殊運転時と全く同様の操作
によって安定して行なうことができる。更に、他のガス
タービン４’の起動・停止時も、前記ガスタービン４の
場合と全く同様に行う。When the gas turbine 4 starts, the switching valve 2
5 is opened, the switching valve 26 is closed, the exhaust gas of the gas turbine 4 is guided to the boiler 2 via the main flow path 3, and the switching device 34 is switched so that the normal command signal 33 is guided to the controller 40. and switches to the normal operating state in which the gas turbine 4 is operated. Further, even during a special operation in which the gas turbine 4 that is being operated is stopped, it can be stably performed by exactly the same operation as in the special operation in which the gas turbine 4 is started. Furthermore, when starting and stopping other gas turbines 4', operations are performed in exactly the same manner as in the case of the gas turbine 4.
【００２３】尚、上記通常時指令信号３３は、予め定め
られた一定値信号３３’によって行なうようにしてもよ
く、この場合は第一の圧力計２７、第一の引算器２９、
関数変換器３１を省略することができる。Note that the normal command signal 33 may be generated using a predetermined constant value signal 33'; in this case, the first pressure gauge 27, the first subtracter 29,
Function converter 31 can be omitted.
【００２４】図２は、前記図１の押込み通風機５が備え
られておらず、ガスタ−ビン４の他に他のガスタ−ビン
４’のみを備えている場合を示している。この場合にお
けるガスタービン４，４’の少なくとも１つが運転され
ている通常運転時、及び通常運転の状態からガスタービ
ンを起動または停止する特殊運転時の作用は前記実施例
と全く同様である。FIG. 2 shows a case where the forced draft fan 5 of FIG. 1 is not provided, and only a gas turbine 4' other than the gas turbine 4 is provided. In this case, the operations during normal operation in which at least one of the gas turbines 4, 4' is operated and during special operation in which the gas turbine is started or stopped from the normal operation state are completely the same as in the previous embodiment.
【００２５】また、図１、図２の実施例に更に他のガス
タ−ビンを追加して備えたものにおいても、また図１に
おいて他のガスタービン４’を有しないものにおいても
、同様に実施することができる。Furthermore, the embodiments shown in FIGS. 1 and 2 can be implemented in the same manner even in the case where another gas turbine is additionally provided, or in the case in which the other gas turbine 4' is not provided in FIG. can do.
【００２６】尚、本発明は、上述の実施例にのみ限定さ
れるものではなく、本発明の要旨を逸脱しない範囲内に
おいて種々変更を加え得ることは勿論である。It should be noted that the present invention is not limited only to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.
【００２７】[0027]
【発明の効果】以上説明したように、本発明の排気再燃
コンバインドサイクルプラントの排ガス圧力制御方法に
よれば、誘引通風機はボイラをバイパスするバイパス管
によりガスタ−ビンの出側の排ガスを吸引することにな
るので、ドラフトロスが大幅に減少し、よって小さい容
量の誘引通風機でガスタ−ビンの出側圧力を十分小さく
保持して、ガスタ−ビンを確実且つ安定して起動、及び
停止させることができ、また通常運転時と特殊運転時の
誘引通風機の制御を切り替えるようにしているので、通
常運転時もガスタービンの出口圧力を制約内に抑え、誘
引通風機のまかなうドラフトロスを小さくできる等の優
れた効果を奏し得る。[Effects of the Invention] As explained above, according to the exhaust gas pressure control method for an exhaust gas reburning combined cycle plant of the present invention, the induced draft fan sucks the exhaust gas on the outlet side of the gas turbine through the bypass pipe that bypasses the boiler. As a result, the draft loss is greatly reduced, and the outlet pressure of the gas turbine can be kept sufficiently low using a small-capacity induced draft fan, so that the gas turbine can be started and stopped reliably and stably. In addition, the induced draft fan control is switched between normal operation and special operation, so the gas turbine outlet pressure can be kept within limits even during normal operation, and the draft loss covered by the induced draft fan can be reduced. It can produce excellent effects such as
【図１】本発明の方法を実施する装置の一例を示すフロ
−シ−トである。FIG. 1 is a flow sheet showing an example of an apparatus for carrying out the method of the present invention.
【図２】本発明の他の例を示すフロ−シ−トである。FIG. 2 is a flow sheet showing another example of the present invention.
【図３】従来装置の一例を示すフロ−シ−トである。FIG. 3 is a flow sheet showing an example of a conventional device.
１ スチ−ムタ−ビン ２ ボイラ ３ 主流路 ４ ガスタ−ビン ４’ 他のガスタ−ビン ５ 押込み通風機 ６ 脱硝装置 ７ 熱交換器 ８ 誘引通風機 ２４ バイパス管 ２７ 第一の圧力計 ２８ 検出圧力信号 ２９ 第一の引算器 ３０ 負荷信号 ３１ 関数変換器 ３２ 圧力信号 ３３ 通常時指令信号 ３３’ 一定値信号 ３４ 切替器 ３５ 第二の圧力計 ３６ 検出圧力信号 ３７ 第二の引算器 ３８ 設定ドラフト信号 ３９ 特殊運転時指令信号 ４０ コントロ−ラ 1 Steam turbine 2 Boiler 3 Main flow path 4 Gas turbine 4’ Other gas turbines 5. Forced ventilation fan 6 Denitration equipment 7 Heat exchanger 8 Induced draft fan 24 Bypass pipe 27 First pressure gauge 28 Detection pressure signal 29 First subtractor 30 Load signal 31 Function converter 32 Pressure signal 33 Normal command signal 33' Constant value signal 34 Switcher 35 Second pressure gauge 36 Detection pressure signal 37 Second subtractor 38 Setting draft signal 39 Special operation command signal 40 Controller
Claims (2)
主流路を介してガスタ−ビンが接続されていると共に、
押込み通風機或いは所要数の他のガスタービンの少なく
とも一方が接続されており、且つ前記ボイラからの排ガ
スが脱硝装置及び熱交換器等を介して誘引通風機に導か
れるように構成してある排気再燃コンバインドサイクル
プラントの排ガス圧力制御方法であって、前記ガスタ−
ビンからの主流路の排ガスを前記ボイラを迂回するバイ
パス管により脱硝装置入口部に導き得るようにし、前記
熱交換器の入口部に第一の圧力計を備えて該第一の圧力
計からの検出圧力信号と、前記スチ−ムタ−ビンの負荷
信号を関数変換器に導いて得られる負荷に応じた圧力信
号とを第一の引算器に導いて引算し、引算により得られ
た通常時指令信号を切替器に導き、前記脱硝装置の入口
部に第二の圧力計を備えて該第二の圧力計からの検出圧
力信号と、設定ドラフト信号とを第二の引算器に導いて
引算し、得られた特殊運転時指令信号を前記切替器に導
き、該切替器により前記通常時指令信号と特殊運転時指
令信号を切り替えて誘引通風機のコントロ−ラに導くよ
うにし、通常運転時には切替器により前記通常指令信号
をコントロ−ラに導き誘引通風機をスチ−ムタ−ビンの
負荷に応じて制御し、またガスタ−ビンの起動・停止な
どの特殊運転時にはガスタ−ビンをバイパス管を介して
脱硝装置入口部に連通させると共に、切替器により前記
特殊運転時指令信号をコントロ−ラに導き脱硝装置入口
部の圧力を低い一定値に保持するよう誘引通風機を制御
することを特徴とする排気再燃コンバインドサイクルプ
ラントの排ガス圧力制御方法。[Claim 1] A boiler equipped with a steam turbine,
A gas turbine is connected via the main flow path, and
An exhaust system to which at least one of a forced draft fan or a required number of other gas turbines is connected, and the exhaust gas from the boiler is guided to the induced draft fan via a denitrification device, a heat exchanger, etc. A method for controlling exhaust gas pressure in a reburning combined cycle plant, the method comprising:
The exhaust gas in the main flow from the bottle can be guided to the inlet of the denitrification equipment by a bypass pipe that bypasses the boiler, and a first pressure gauge is provided at the inlet of the heat exchanger, and the exhaust gas from the first pressure gauge is provided at the inlet of the heat exchanger. The detected pressure signal and the pressure signal corresponding to the load obtained by introducing the load signal of the steam turbine to a function converter are led to a first subtracter and subtracted, and the result obtained by the subtraction is A normal command signal is guided to a switch, a second pressure gauge is provided at the inlet of the denitration equipment, and a detected pressure signal from the second pressure gauge and a set draft signal are sent to a second subtractor. The obtained special operation command signal is guided to the switching device, and the switching device switches between the normal operation command signal and the special operation command signal and guides it to the induced draft fan controller. During normal operation, the normal command signal is sent to the controller by a switch to control the induced draft fan according to the load on the steam turbine, and during special operations such as starting and stopping the gas turbine, the normal command signal is sent to the controller. is communicated with the inlet of the denitrification device via a bypass pipe, and the special operation command signal is sent to the controller by a switch to control the induced draft fan so as to maintain the pressure at the inlet of the denitrification device at a low constant value. An exhaust gas pressure control method for an exhaust gas reburning combined cycle plant, characterized in that:
通常指令信号を出力させることに替えて、通常時指令信
号を設定された一定値信号とすることを特徴とする請求
項１記載の排気再燃コンバインドサイクルプラントの排
ガス圧力制御方法。2. The apparatus according to claim 1, wherein instead of outputting the normal command signal in accordance with the load signal of the steam turbine, the normal command signal is a preset constant value signal. Exhaust gas pressure control method for exhaust reburning combined cycle plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14121791A JPH04342805A (en) | 1991-05-17 | 1991-05-17 | Method of controlling pressure of exhaust gas from exhaust gas recombustion type combined cycle plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14121791A JPH04342805A (en) | 1991-05-17 | 1991-05-17 | Method of controlling pressure of exhaust gas from exhaust gas recombustion type combined cycle plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04342805A true JPH04342805A (en) | 1992-11-30 |
Family
ID=15286861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14121791A Pending JPH04342805A (en) | 1991-05-17 | 1991-05-17 | Method of controlling pressure of exhaust gas from exhaust gas recombustion type combined cycle plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04342805A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2966906A1 (en) * | 2010-10-29 | 2012-05-04 | Gen Electric | HEAT RECOVERY VAPOR GENERATOR |
| EP3670854A1 (en) * | 2018-12-19 | 2020-06-24 | Commissariat à l'Energie Atomique et aux Energies Alternatives | System for co-generation of electrical energy and thermal energy by a rankine cycle module |
| EP3885541A3 (en) * | 2020-03-25 | 2021-11-03 | General Electric Company | Combined cycle power plant and methods of controlling emissions therefrom |
-
1991
- 1991-05-17 JP JP14121791A patent/JPH04342805A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2966906A1 (en) * | 2010-10-29 | 2012-05-04 | Gen Electric | HEAT RECOVERY VAPOR GENERATOR |
| US9359918B2 (en) | 2010-10-29 | 2016-06-07 | General Electric Company | Apparatus for reducing emissions and method of assembly |
| EP3670854A1 (en) * | 2018-12-19 | 2020-06-24 | Commissariat à l'Energie Atomique et aux Energies Alternatives | System for co-generation of electrical energy and thermal energy by a rankine cycle module |
| FR3090734A1 (en) * | 2018-12-19 | 2020-06-26 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | System of cogeneration of electrical energy and thermal energy by a Rankine cycle module |
| EP3885541A3 (en) * | 2020-03-25 | 2021-11-03 | General Electric Company | Combined cycle power plant and methods of controlling emissions therefrom |
| US11365677B2 (en) | 2020-03-25 | 2022-06-21 | General Electric Company | Combined cycle power plant and Methods of controlling emissions therefrom |
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