JP4138157B2 - Steam-cooled gas turbine startup system - Google Patents

Steam-cooled gas turbine startup system Download PDF

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JP4138157B2
JP4138157B2 JP16848499A JP16848499A JP4138157B2 JP 4138157 B2 JP4138157 B2 JP 4138157B2 JP 16848499 A JP16848499 A JP 16848499A JP 16848499 A JP16848499 A JP 16848499A JP 4138157 B2 JP4138157 B2 JP 4138157B2
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steam
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gas turbine
boiler
turbine
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JP2000356111A (en
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正幸 高浜
安弘 橋本
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Mitsubishi Heavy Industries Ltd
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    • 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
    • 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]

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は蒸気冷却ガスタービンの起動システムに関し、起動時に燃焼器の冷却用蒸気を他のプラントから供給し、不足分をバックアップできるようにしたものである。
【０００２】
【従来の技術】
従来、圧縮機、燃焼器およびガスタービンを連結したガスタービン系統と、前記ガスタービンからの排ガスを導入する排熱回収ボイラ、このボイラからの蒸気で回転される蒸気タービン、および復水器を連結した蒸気タービン系統とを複合した複合発電プラントが知られている。
【０００３】
このような複合発電プラントでは、ガスタービン系統の高温ガスに曝される部位、例えばガスタービンのタービン静翼や動翼、または燃焼器等を、圧縮機から抽気した空気の供給によって冷却するのが一般的であった。これに対して近年、ガスタービンの高効率化の要請により燃焼温度の高温化及びタービン部品の高温化が進む傾向にあることから、冷却性能の優れた蒸気を高温部品に供給して冷却を行うことが提案されている。
【０００４】
図２はガスタービンと蒸気タービンを組合せた複合発電プラントにおいて蒸気冷却を行うガスタービン燃焼器を有するプラントの一般的な概念図である。図においてガスタービン４１で発電に供され、排気される燃焼ガス６０はボイラ４２に供給され、ボイラ４２では主燃料とこのガスタービン４１からの高温燃焼ガス６０とで蒸気６１を発生し、排ガス６２は煙突６３から大気へ放出される。発生した蒸気６１は蒸気タービン４３へ供給され、発電機を回し、電力を得ている。ガスタービン４１の燃焼器の冷却は、ボイラ４２で発生する蒸気の一部を抽気し、蒸気４４として燃焼器に導き、燃焼器を冷却し、冷却で加熱された回収蒸気４５は蒸気タービン４３へ戻されて再利用されている。
【０００５】
しかしながら、上記のような蒸気冷却方式においては、起動直後のボイラ４２の蒸気発生量が少いために補助蒸気発生装置を別途設置し、補助蒸気発生装置から冷却用の蒸気を導き、不足分の蒸気を補うことが行なわれている。
【０００６】
【発明が解決しようとする課題】
前述のように従来の複合発電プラントにおけるガスタービン燃焼器の蒸気冷却方式においてはボイラからの蒸気を抽気し、燃焼器を冷却し、冷却後の蒸気は回収蒸気として蒸気タービンに戻し活用することが提案されているが、起動時におけるボイラでの蒸気発生量が少いので補助蒸気発生装置を必要としている。しかし、このような起動時のためには外部に大型の補助蒸気発生装置を必要とし、又、起動時の蒸気使用量も多く、補助蒸気の使用なしでボイラで発生する蒸気のみで起動できるようにすることが以前より強く望まれていた。
【０００７】
そこで本発明は、蒸気冷却方式のガスタービンの燃焼器の冷却蒸気として補助蒸気発生装置を必要としないで、起動時には、運転を継続している他のプラントの蒸気を得るようにし、又、自己のプラントが充分立上り、運転を継続している時には他のプラントの起動用として蒸気の一部を溜めるようにするような蒸気冷却ガスタービン起動システムを提供することを課題としてなされたものである。
【０００８】
【課題を解決するための手段】
本発明は前述の課題を解決するために次の（１），（２）の手段を提供する。
【０００９】
（１）ガスタービンの排気をボイラに導き、同ボイラで発生した蒸気を蒸気タービンに導いてこれを駆動すると共に、同ボイラの蒸気の一部を抽気して前記ガスタービンの燃焼器に導き同燃焼器を冷却する蒸気冷却ガスタービンシステムにおいて、前記ボイラから抽気された蒸気は減温減圧装置を介して、蒸気を溜めておく機能を備えたヘッダに導かれ、同ヘッダから前記ガスタービンの燃焼器に導かれて同燃焼器を冷却すると共に、前記ヘッダは隣接する他のガスタービンにも冷却用蒸気を供給可能とし、同他のガスタービンの起動時の冷却用蒸気の供給をバックアップすることを特徴とする蒸気冷却ガスタービン起動システム。
【００１０】
（２）上記（１）の発明において、前記ヘッダには隣接する他の蒸気タービンプラントから蒸気を供給可能とすることを特徴とする蒸気冷却ガスタービン起動システム。
【００１１】
本発明の（１）においては、隣接する蒸気冷却ガスタービンが存在する場合には、ボイラからの蒸気の一部は蒸気を溜めておく機能を備えたヘッダに導かれる。ヘッダへは、例えばボイラからの高圧蒸気を減温減圧装置を介して減温、減圧して導くようにして蒸気を溜めておき、ヘッダから、ガスタービンの燃焼器へ蒸気を導き、燃焼器を冷却する。隣接する他のガスタービンを起動する場合には、ボイラから発生する蒸気は不充分であり、立上り時には冷却用蒸気が不足するが、その不足分は一方のヘッダに溜めてある蒸気が他方のガスタービンの燃焼器へ供給されるので、不足分がバックアップされ、起動時においても燃焼器を充分冷却することができる。従って、隣接して蒸気冷却ガスタービンが並設されている場合には、本発明のシステムによれば補助用の蒸気発生装置を別途設置する必要なく起動時の燃焼器の冷却が可能となり、安全な起動を行うことができる。
【００１２】
本発明の（２）では、ヘッダの蒸気が不充分で起動時にガスタービンの燃焼器が充分に冷却できない場合には、隣接する他の蒸気タービンプラントからヘッダに蒸気を供給することができるので、上記（１）の発明の効果を一層確実なものとすることができる。特に並設するガスタービンを同時に起動するような場合には、立上り時にヘッダには充分な蒸気が溜まってないので、隣接する他の蒸気タービンから蒸気がヘッダに供給され、起動時に並設するガスタービンの蒸気冷却を充分に行うことができる。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態について図面に基づいて具体的に説明する。図１は本発明の実施の一形態に係る蒸気冷却ガスタービン起動システムを適用したプラントの系統図である。図においてＡは No.１発電プラント，Ｂは No.２発電プラント，Ｃは他の隣接するプラントである。本発明は No.１， No.２発電プラントＡ，Ｂの起動時にガスタービン燃焼器の冷却用蒸気が不足する場合には、 No.１， No.２プラントＡ，Ｂ同志で互いに蒸気の供給をバックアップし、又、他のプラント２０からも蒸気を供給できるようにしたものであり、以下に詳しく説明する。
【００１４】
図１において、１は蒸気タービン、２はガスタービン、３はボイラ、４は煙突であり、ガスタービン１の燃焼器で発生した高温の燃焼ガスはガスタービン１を駆動し、その排ガスはボイラ３に導入され、ボイラ３で蒸気を発生させ、煙突４より大気に放出される。５はヘッダであり蒸気を合流させ、又、分岐させるものである。６は減温減圧装置であり、７は蒸気タービン１へ流入する蒸気の流量調節弁、８は蒸気タービン１で仕事をし、流出する蒸気の流量調節弁、９はヘッダよりガスタービン２の燃焼器に導かれる冷却用蒸気の配管であり、配管９からの蒸気は燃焼器を冷却後回収蒸気９ａとして回収されて蒸気タービンの蒸気系に戻されるものである。これら１〜９により No.１発電プラントＡが構成されている。
【００１５】
同様に No.２発電プラントＢは、蒸気タービン１１、ガスタービン１２、ボイラ１３、煙突１４、減温減圧装置１６、流量調節弁１７，１８で No.１発電プラントと同じように構成され、ガスタービン１２の燃焼器にはヘッダ５から No.１発電プラントと同じように配管１９を通り、冷却蒸気が導かれ、燃焼器を冷却後回収蒸気１９ａとして回収される。
【００１６】
隣接する他のプラントＣは、蒸気タービン２１、ボイラ２２、もう一方の蒸気タービン３１とボイラ３２低圧ヘッダ２３、高圧ヘッダ２４から構成される。２５，３５はボイラ２２，３２から蒸気タービン２１，３１へそれぞれ流入する高圧蒸気の流量調節弁、２６，３６はボイラ２２から蒸気タービン２１，３１にそれぞれ流入する中圧又は低圧蒸気の流量調節弁である。
【００１７】
上記構成のプラントにおいて、 No.１， No.２発電プラントＡ，Ｂでは、ガスタービン２，１２の燃焼器で燃焼した高温燃焼ガスはガスタービン２，１２をそれぞれ駆動し、その排気はボイラ３，１３に導かれ、蒸気タービン１，１１の排気する低温蒸気又は復水を加熱した後、煙突４，１４からそれぞれ大気に放出される。
【００１８】
ボイラ３，１３で発生した蒸気は流量調節弁７，１７を介して蒸気タービン１，１１に流入し、蒸気タービン１，１１をそれぞれ駆動して仕事をし、その排気は流量調節弁８，１８を介して再びボイラ３，１３へ導かれる。ボイラ３，１３からの蒸気の一部は減温減圧装置６，１６でそれぞれ減温、減圧されてヘッダ５へ流入し、又、蒸気タービン１，１１で仕事をした蒸気の一部もボイラ３，１３に流入する経路から分岐し、それぞれヘッダ５に流入し、ヘッダ５で合流してここに溜まる。
【００１９】
ヘッダ５からはガスタービン２，１２の各燃焼器にそれぞれ配管９，１９により冷却用蒸気が導かれ、燃焼器をそれぞれ冷却し、冷却後の蒸気はそれぞれ蒸気タービン１，１１側の蒸気系へ回収蒸気９ａ，１９ａとして回収され、有効活用される。
【００２０】
一方、他のプラントＣにおいては、ボイラ２２で発生した高圧蒸気、低圧又は中圧蒸気はそれぞれ流量調節弁２５，２６を介して蒸気タービン２１に導かれ、蒸気タービン２１を駆動して仕事をし、ボイラ２２に戻され、その一部は低圧ヘッダ２３にも流入する。同様にボイラ３２で発生した高圧蒸気、低圧又は中圧蒸気はそれぞれ流量調節弁３５，３６を介して蒸気タービン３１に導かれ、蒸気タービン３１で仕事をし、ボイラ３２に戻される共に、その一部は低圧ヘッダ２３にも流入する。なお、低圧ヘッダ２３に溜まった蒸気は図示省略の他の系に導かれ利用される。
【００２１】
又、ボイラ２２で発生した高圧蒸気の一部は高圧ヘッダ２４に流入し、更にボイラ３２で発生した高圧蒸気の一部も高圧ヘッダ２４に流入し、ここに溜まる。他のプラントＣの高圧ヘッダ２４に溜まった蒸気は配管２０、流量調節弁３８を介して No.１発電プラントＡのヘッダ５に流入するようになっている。
【００２２】
上記構成の蒸気冷却を採用したプラントにおいて、プラントの起動時には、ボイラ３，１３の蒸気発生量が充分でなく、起動時には燃焼器の冷却用蒸気が不足する。そこで、まず No.１発電プラントＡを運転中には、ボイラ３から蒸気タービン１に蒸気を供給すると共に、ボイラ３で発生した蒸気の一部は減温減圧装置６を通して蒸気を減温、減圧し、ヘッダ５に供給し、ここに溜めた状態にしておく。
【００２３】
ここで No.２プラントＢを起動する時には、 No.２プラントＢのボイラ１３は充分に蒸気を発生していないので、ガスタービン１２の燃焼器の冷却用蒸気が不充分となるが、この不足分はヘッダ５に溜まっている蒸気を供給して不足分を補うことができる。なお、 No.２発電プラントＢを先に駆動し、 No.１発電プラントＡを後から起動する場合も同様に先に起動した方が後に起動するガスタービンをバックアップする。
【００２４】
又、 No.１プラントＡ， No.２プラントＢが同時に起動する場合にはガスタービン２，１２の燃焼器の冷却蒸気が不足となるので、この場合には運転中の隣接する他のプラントＣの高圧ヘッダ２４から配管２０、流量調節弁３８を介して他のプラントＣからの蒸気をヘッダ５に供給し、蒸気の不足分を補充し、ヘッダ５から配管９，１９を通ってガスタービン２，１２の燃焼器にそれぞれ冷却用蒸気を供給し、起動時においても充分に燃焼器を冷却することができる。
【００２５】
以上説明の実施の形態によれば、蒸気冷却ガスタービンにおいて、ガスタービン２，１２の燃焼器の冷却用蒸気を減温、減圧装置６，１６を通してボイラ３，１３から導き、ヘッダ５に溜めておく。ヘッダ５を共用することにより、ヘッダ５から冷却蒸気供給用の配管９，１９を介してガスタービン２，１２に蒸気を供給できるような構成とし、起動時の一方のボイラの発生する蒸気量が少い時に他方の冷却用蒸気の供給をバックアップすることができる。
【００２６】
更に、 No.１発電プラントＡ、 No.２発電プラントＢを同時に起動するような場合で、冷却用蒸気が不足する場合には、隣接する他のプラントＣからヘッダ５へ蒸気を供給し、ガスタービン２，１２の燃焼器の冷却用蒸気としてバックアップすることができる。このようなバックアップ系統により補助蒸気発生装置を特別に設置する必要がなく、起動時の冷却用蒸気を得ることができ、起動が可能になる。
【００２７】
【発明の効果】
本発明の蒸気冷却ガスタービン起動システムは、（１）ガスタービンの排気をボイラに導き、同ボイラで発生した蒸気を蒸気タービンに導いてこれを駆動すると共に、同ボイラの蒸気の一部を抽気して前記ガスタービンの燃焼器に導き同燃焼器を冷却する蒸気冷却ガスタービンシステムにおいて、前記ボイラから抽気された蒸気は減温減圧装置を介して、蒸気を溜めておく機能を備えたヘッダに導かれ、同ヘッダから前記ガスタービンの燃焼器に導かれて同燃焼器を冷却すると共に、前記ヘッダは隣接する他のガスタービンにも冷却用蒸気を供給可能とし、同他のガスタービンの起動時の冷却用蒸気の供給をバックアップすることを特徴としている。このようなシステムにより、一方のガスタービンの起動時にボイラの発生する蒸気が不足し、燃焼器の冷却が不充分となる場合でも蒸気を溜めておく機能を備えたヘッダを介して他方のプラントがバックアップするので起動時の燃焼器の冷却を可能とする。又、起動用の補助蒸気発生装置を別途設置する必要なくガスタービンの起動を可能とするものである。
【００２８】
本発明の（２）は、上記（１）の発明において、前記ヘッダには隣接する他の蒸気タービンプラントから蒸気を供給可能とすることを特徴としている。このようなシステムにおいて、上記（１）の発明のヘッダが充分に蒸気を供給できなくて、ガスタービンの起動時の燃焼器の冷却ができない場合には隣接する他の蒸気プラントがヘッダに蒸気を供給するので、起動時のガスタービン燃焼器の冷却を充分に行うことができる。
【図面の簡単な説明】
【図１】本発明の実施の一形態に係る蒸気冷却ガスタービンの起動方法を適用した発電システムの系統図である。
【図２】複合発電プラントにおける蒸気冷却システムの一般的な構成図である。
【符号の説明】
１，１１，２１，３１ 蒸気タービン
２，１２ ガスタービン
３，１３，２２，３２ ボイラ
５ ヘッダ
６，１６ 減温減圧装置
７，８，１７，１８，３８ 流量調節弁
９，１９，２０ 配管
９ａ，１９ａ 回収蒸気
２３ 低圧ヘッダ
２４ 高圧ヘッダ
２５，２６，３５，３６ 流量調節弁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a start system for a steam-cooled gas turbine, and supplies steam for cooling a combustor from another plant at the time of start-up so that the shortage can be backed up.
[0002]
[Prior art]
Conventionally, a gas turbine system in which a compressor, a combustor, and a gas turbine are connected, an exhaust heat recovery boiler that introduces exhaust gas from the gas turbine, a steam turbine that is rotated by steam from the boiler, and a condenser are connected. There is known a combined power plant combined with a steam turbine system.
[0003]
In such a combined power plant, a part exposed to a high-temperature gas in a gas turbine system, for example, a turbine stationary blade, moving blade, or combustor of a gas turbine is cooled by supplying air extracted from a compressor. It was general. On the other hand, in recent years, there has been a trend toward higher combustion temperatures and higher turbine components due to demands for higher efficiency of gas turbines, so cooling is performed by supplying steam with excellent cooling performance to high-temperature components. It has been proposed.
[0004]
FIG. 2 is a general conceptual diagram of a plant having a gas turbine combustor that performs steam cooling in a combined power plant combining a gas turbine and a steam turbine. In the figure, the combustion gas 60 that is supplied to the power generation and exhausted by the gas turbine 41 is supplied to the boiler 42, and the boiler 42 generates steam 61 from the main fuel and the high-temperature combustion gas 60 from the gas turbine 41, and the exhaust gas 62. Is emitted from the chimney 63 to the atmosphere. The generated steam 61 is supplied to the steam turbine 43 and rotates a generator to obtain electric power. For cooling the combustor of the gas turbine 41, a part of the steam generated in the boiler 42 is extracted and led to the combustor as steam 44, the combustor is cooled, and the recovered steam 45 heated by the cooling is sent to the steam turbine 43. Returned and reused.
[0005]
However, in the steam cooling system as described above, since the amount of steam generated in the boiler 42 immediately after startup is small, an auxiliary steam generator is installed separately, and the steam for cooling is led from the auxiliary steam generator, and the insufficient steam is generated. It is done to supplement.
[0006]
[Problems to be solved by the invention]
As described above, in the steam cooling system of a gas turbine combustor in a conventional combined power plant, steam from a boiler is extracted, the combustor is cooled, and the steam after cooling is returned to the steam turbine as recovered steam for use. Although proposed, the amount of steam generated in the boiler at startup is small, so an auxiliary steam generator is required. However, a large auxiliary steam generator is required outside for such startup, and the amount of steam used at startup is large so that it can be started only with steam generated in the boiler without using auxiliary steam. It was strongly desired to make it.
[0007]
Therefore, the present invention does not require an auxiliary steam generator as the cooling steam of the gas turbine combustor of the steam cooling system, and at the time of start-up, obtains steam from another plant that is continuing to operate, It is an object of the present invention to provide a steam-cooled gas turbine starting system that can store a part of steam for starting other plants when the plant is sufficiently up and running.
[0008]
[Means for Solving the Problems]
The present invention provides the following means (1) and (2) to solve the above-mentioned problems.
[0009]
(1) The gas turbine exhaust is guided to the boiler, the steam generated in the boiler is guided to the steam turbine and driven, and a part of the steam of the boiler is extracted and guided to the combustor of the gas turbine. In a steam-cooled gas turbine system for cooling a combustor, steam extracted from the boiler is guided to a header having a function of storing steam through a temperature reducing and decompressing device, and combustion of the gas turbine is performed from the header. The header is cooled to cool the combustor, and the header can also supply cooling steam to other adjacent gas turbines to back up the supply of cooling steam when starting the other gas turbines. A steam-cooled gas turbine startup system characterized by
[0010]
(2) In the invention of (1), a steam-cooled gas turbine starting system is characterized in that steam can be supplied to the header from another adjacent steam turbine plant.
[0011]
In (1) of the present invention, when there is an adjacent steam-cooled gas turbine, a part of the steam from the boiler is led to a header having a function of storing the steam . For example, the high pressure steam from the boiler is reduced and reduced in pressure via a temperature reducing and depressurizing device , and the steam is stored in the header. The steam is guided from the header to the combustor of the gas turbine, and the combustor is installed. Cooling. When starting another adjacent gas turbine, the steam generated from the boiler is insufficient, and there is insufficient cooling steam at the start-up, but the shortage is due to the steam stored in one header. Since it is supplied to the combustor of the turbine, the shortage is backed up, and the combustor can be sufficiently cooled even at the time of startup. Therefore, when steam-cooled gas turbines are arranged adjacent to each other, the system of the present invention enables cooling of the combustor at the start-up without the need to separately install an auxiliary steam generator. Can be started.
[0012]
In (2) of the present invention, when the steam in the header is insufficient and the combustor of the gas turbine cannot be sufficiently cooled at startup, steam can be supplied to the header from another adjacent steam turbine plant. The effect of the invention of (1) can be further ensured. Especially when gas turbines installed side by side are started at the same time, sufficient steam does not accumulate in the header at the start-up, so steam is supplied to the header from other adjacent steam turbines, and the gas is installed side by side at startup. The steam can be sufficiently cooled in the turbine.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a system diagram of a plant to which a steam-cooled gas turbine startup system according to an embodiment of the present invention is applied. In the figure, A is a No. 1 power plant, B is a No. 2 power plant, and C is another adjacent plant. When the steam for cooling the gas turbine combustor is insufficient at the start-up of No. 1 and No. 2 power plants A and B, the present invention supplies steam to each other between No. 1 and No. 2 plants A and B. The steam is supplied from the other plant 20 and will be described in detail below.
[0014]
In FIG. 1, 1 is a steam turbine, 2 is a gas turbine, 3 is a boiler, 4 is a chimney, high-temperature combustion gas generated in the combustor of the gas turbine 1 drives the gas turbine 1, and the exhaust gas is boiler 3. The steam is generated by the boiler 3 and discharged from the chimney 4 to the atmosphere. Reference numeral 5 denotes a header for joining and branching steam. 6 is a temperature reducing pressure reducing device, 7 is a flow rate control valve for the steam flowing into the steam turbine 1, 8 is a flow rate control valve for the steam flowing out and working in the steam turbine 1, and 9 is a combustion of the gas turbine 2 from the header. The steam from the pipe 9 is recovered as recovered steam 9a after cooling the combustor and returned to the steam system of the steam turbine. These Nos. 1 to 9 constitute No. 1 power plant A.
[0015]
Similarly, the No. 2 power plant B is configured in the same manner as the No. 1 power plant with the steam turbine 11, the gas turbine 12, the boiler 13, the chimney 14, the temperature reducing pressure reducing device 16, and the flow control valves 17 and 18, and the gas As with the No. 1 power plant, the cooling steam is guided from the header 5 to the combustor of the turbine 12 through the pipe 19, and is recovered as recovered steam 19a after cooling the combustor.
[0016]
The other adjacent plant C is composed of a steam turbine 21, a boiler 22, another steam turbine 31 and a boiler 32, a low pressure header 23, and a high pressure header 24. Reference numerals 25 and 35 denote flow control valves for high-pressure steam flowing from the boilers 22 and 32 to the steam turbines 21 and 31, respectively. Reference numerals 26 and 36 denote flow control valves for medium-pressure or low-pressure steam that flow from the boiler 22 to the steam turbines 21 and 31, respectively. It is.
[0017]
In the plants configured as described above, in the No. 1 and No. 2 power plants A and B, the high-temperature combustion gas burned in the combustors of the gas turbines 2 and 12 drives the gas turbines 2 and 12, respectively, and the exhaust gas is discharged from the boiler 3 , 13, and the low-temperature steam or condensate exhausted by the steam turbines 1, 11 is heated and then discharged from the chimneys 4, 14 to the atmosphere.
[0018]
The steam generated in the boilers 3 and 13 flows into the steam turbines 1 and 11 via the flow rate control valves 7 and 17 and drives the steam turbines 1 and 11 to perform work. Is again led to the boilers 3 and 13. Part of the steam from the boilers 3 and 13 is reduced in temperature and decompressed by the temperature reduction and decompression devices 6 and 16 and flows into the header 5, and part of the steam that has worked in the steam turbines 1 and 11 is also in the boiler 3. , 13 branches from the path flowing into the header 13, flows into the header 5, joins at the header 5, and accumulates here.
[0019]
From the header 5, cooling steam is guided to the respective combustors of the gas turbines 2 and 12 through the pipes 9 and 19, respectively, and the combustors are cooled, respectively, and the steam after cooling to the steam system on the steam turbine 1 and 11 side, respectively. The recovered steam 9a and 19a are recovered and effectively used.
[0020]
On the other hand, in the other plant C, high-pressure steam, low-pressure or medium-pressure steam generated in the boiler 22 is led to the steam turbine 21 through the flow control valves 25 and 26, respectively, and drives the steam turbine 21 to work. , Returned to the boiler 22, part of which also flows into the low-pressure header 23. Similarly, high-pressure steam, low-pressure, or medium-pressure steam generated in the boiler 32 is guided to the steam turbine 31 through the flow control valves 35 and 36, respectively, and works in the steam turbine 31 and is returned to the boiler 32. The part also flows into the low-pressure header 23. Note that the steam accumulated in the low-pressure header 23 is guided to another system not shown and used.
[0021]
A part of the high-pressure steam generated in the boiler 22 flows into the high-pressure header 24, and a part of the high-pressure steam generated in the boiler 32 also flows into the high-pressure header 24 and accumulates therein. Steam accumulated in the high-pressure header 24 of another plant C flows into the header 5 of the No. 1 power plant A via the pipe 20 and the flow rate control valve 38.
[0022]
In a plant employing steam cooling with the above-described configuration, the amount of steam generated by the boilers 3 and 13 is not sufficient when the plant is started up, and the cooling steam for the combustor is insufficient at the time of startup. Therefore, during operation of No. 1 power plant A, steam is supplied from the boiler 3 to the steam turbine 1, and part of the steam generated in the boiler 3 is reduced in temperature and reduced in pressure through the temperature reducing and decompressing device 6. Then, it is supplied to the header 5 and kept in a state where it is stored here.
[0023]
When the No. 2 plant B is started up, the boiler 13 of the No. 2 plant B does not generate enough steam, so the steam for cooling the combustor of the gas turbine 12 becomes insufficient. The minute can be compensated for by supplying the steam accumulated in the header 5. Note that when the No. 2 power plant B is driven first and the No. 1 power plant A is started later, the gas turbine that is started later backs up the gas turbine.
[0024]
In addition, when No. 1 plant A and No. 2 plant B are started simultaneously, the cooling steam of the combustors of gas turbines 2 and 12 becomes insufficient. In this case, other adjacent plant C in operation The steam from the other plant C is supplied to the header 5 through the pipe 20 and the flow rate control valve 38 from the high-pressure header 24, and the shortage of steam is replenished. , 12 can be supplied to each of the combustors, and the combustors can be sufficiently cooled even at startup.
[0025]
According to the embodiment described above, in the steam-cooled gas turbine, the temperature of the cooling steam for the combustor of the gas turbines 2 and 12 is reduced and guided from the boilers 3 and 13 through the decompression devices 6 and 16 and accumulated in the header 5. deep. By using the header 5 in common, the steam can be supplied from the header 5 to the gas turbines 2 and 12 via the cooling steam supply pipes 9 and 19, and the amount of steam generated by one boiler at the time of startup is reduced. The supply of the other cooling steam can be backed up at a low time.
[0026]
Further, when the No. 1 power plant A and the No. 2 power plant B are started simultaneously and the steam for cooling is insufficient, the steam is supplied to the header 5 from another adjacent plant C, and the gas It can be backed up as cooling steam for the combustors of the turbines 2 and 12. Such a backup system does not require any special installation of an auxiliary steam generator, can obtain the cooling steam at the time of startup, and can be started up.
[0027]
【The invention's effect】
The steam-cooled gas turbine starting system of the present invention is (1) guiding the exhaust of the gas turbine to a boiler, guiding the steam generated in the boiler to the steam turbine and driving it, and extracting a part of the steam of the boiler In the steam-cooled gas turbine system, which is led to the combustor of the gas turbine and cools the combustor, the steam extracted from the boiler is provided in a header having a function of accumulating steam through a temperature reducing and decompressing device. It is led from the header to the combustor of the gas turbine to cool the combustor, and the header can also supply cooling steam to other adjacent gas turbines. It is characterized by backing up the cooling steam supply at the time. With such a system, the steam generated by the boiler at the start of one gas turbine is insufficient, and the other plant is connected via a header that has a function of storing steam even when the combustor is insufficiently cooled. Since it is backed up, the combustor can be cooled at startup. Further, it is possible to start the gas turbine without the need to separately install an auxiliary steam generator for starting.
[0028]
(2) of the present invention is characterized in that, in the invention of (1), steam can be supplied from another steam turbine plant adjacent to the header. In such a system, when the header of the invention of (1) cannot sufficiently supply steam and the combustor cannot be cooled when the gas turbine is started, another adjacent steam plant supplies steam to the header. Since it supplies, cooling of the gas turbine combustor at the time of starting can fully be performed.
[Brief description of the drawings]
FIG. 1 is a system diagram of a power generation system to which a method for starting a steam-cooled gas turbine according to an embodiment of the present invention is applied.
FIG. 2 is a general configuration diagram of a steam cooling system in a combined power plant.
[Explanation of symbols]
1, 11, 21, 31 Steam turbine 2, 12 Gas turbine 3, 13, 22, 32 Boiler 5 Header 6, 16 Temperature reducing pressure reducing device 7, 8, 17, 18, 38 Flow rate adjusting valve 9, 19, 20 Piping 9 a , 19a Recovery steam 23 Low pressure header 24 High pressure header 25, 26, 35, 36 Flow control valve

Claims (2)

ガスタービンの排気をボイラに導き、同ボイラで発生した蒸気を蒸気タービンに導いてこれを駆動すると共に、同ボイラの蒸気の一部を抽気して前記ガスタービンの燃焼器に導き同燃焼器を冷却する蒸気冷却ガスタービンシステムにおいて、前記ボイラから抽気された蒸気は減温減圧装置を介して、蒸気を溜めておく機能を備えたヘッダに導かれ、同ヘッダから前記ガスタービンの燃焼器に導かれて同燃焼器を冷却すると共に、前記ヘッダは隣接する他のガスタービンにも冷却用蒸気を供給可能とし、同他のガスタービンの起動時の冷却用蒸気の供給をバックアップすることを特徴とする蒸気冷却ガスタービン起動システム。The exhaust of the gas turbine is guided to the boiler, the steam generated in the boiler is guided to the steam turbine and driven, and a part of the steam of the boiler is extracted and guided to the combustor of the gas turbine. In the steam-cooled gas turbine system to be cooled, the steam extracted from the boiler is led to a header having a function of storing steam via a temperature reducing and decompressing device, and from the header to the combustor of the gas turbine. In addition, the header cools the combustor, and the header can supply cooling steam to other adjacent gas turbines, and backs up the supply of cooling steam when starting the other gas turbines. Steam cooling gas turbine startup system. 前記ヘッダには隣接する他の蒸気タービンプラントから蒸気を供給可能とすることを特徴とする請求項１記載の蒸気冷却ガスタービン起動システム。  The steam-cooled gas turbine startup system according to claim 1, wherein steam can be supplied to the header from another steam turbine plant adjacent thereto.
JP16848499A 1999-06-15 1999-06-15 Steam-cooled gas turbine startup system Expired - Fee Related JP4138157B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104676250A (en) * 2014-12-25 2015-06-03 无锡职业技术学院 Steam exhaust recycling and main pipe network dual-combination steam regulating system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104676250A (en) * 2014-12-25 2015-06-03 无锡职业技术学院 Steam exhaust recycling and main pipe network dual-combination steam regulating system

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