JP2984442B2 - Gas turbine steam cooling method and apparatus - Google Patents

Gas turbine steam cooling method and apparatus

Info

Publication number
JP2984442B2
JP2984442B2 JP3327079A JP32707991A JP2984442B2 JP 2984442 B2 JP2984442 B2 JP 2984442B2 JP 3327079 A JP3327079 A JP 3327079A JP 32707991 A JP32707991 A JP 32707991A JP 2984442 B2 JP2984442 B2 JP 2984442B2
Authority
JP
Japan
Prior art keywords
steam
turbine
gas turbine
gas
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP3327079A
Other languages
Japanese (ja)
Other versions
JPH05141267A (en
Inventor
重実 万代
聡 谷村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku Electric Power Co Inc
Mitsubishi Heavy Industries Ltd
Original Assignee
Tohoku Electric Power Co Inc
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tohoku Electric Power Co Inc, Mitsubishi Heavy Industries Ltd filed Critical Tohoku Electric Power Co Inc
Priority to JP3327079A priority Critical patent/JP2984442B2/en
Publication of JPH05141267A publication Critical patent/JPH05141267A/en
Application granted granted Critical
Publication of JP2984442B2 publication Critical patent/JP2984442B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02Plants 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
    • F01K23/06Plants 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
    • F01K23/10Plants 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Landscapes

  • 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

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、ガスタービン・蒸気タ
ービンコンバインドプラントに適用されるガスタービン
の蒸気冷却方法及び装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine steam cooling method and apparatus applied to a gas turbine / steam turbine combined plant.

【0002】[0002]

【従来の技術】図2は、従来の蒸気冷却方法を採用した
ガスタービン・蒸気タービンコンバインドプラントの系
統図である。図2において、圧縮機1で圧縮された空気
は、燃焼器2で燃料を燃焼させて高温ガスとなり、ガス
タービン3で膨脹した後、排ガスボイラ4に送られて蒸
気を発生させ、その後煙突5から大気中に排出される。
一方、排ガスボイラ4で発生した蒸気は蒸気タービン6
に送られて仕事をなし、その後復水器7に送られて復水
する。そして、ガスタービン3及び蒸気タービン6はそ
れぞれ発電機8を駆動する。
2. Description of the Related Art FIG. 2 is a system diagram of a gas turbine / steam turbine combined plant employing a conventional steam cooling method. In FIG. 2, air compressed by a compressor 1 burns fuel in a combustor 2 to become a high-temperature gas. After expansion in a gas turbine 3, the air is sent to an exhaust gas boiler 4 to generate steam, and then a chimney 5 Is released into the atmosphere from
On the other hand, the steam generated in the exhaust gas boiler 4 is
To work, and then sent to the condenser 7 to condense. Then, the gas turbine 3 and the steam turbine 6 each drive the generator 8.

【0003】以上述べた構成において、燃焼器2及び
スタービン3を冷却するのに、後述する冷却方法が適用
される前の従来技術では、一般に、圧縮機1の吐出空気
や抽気のような流体が使われ、冷却後、この流体は燃焼
器2内又はガスタービン3のガスパス内に放出されてい
る。このため、燃焼器2内では燃焼に与える空気量が減
少してNOxを増大させ、ガスタービン3では冷却空気
が作動ガスに混入してガス温度を下げ、効率低下の原因
となっていた
In the configuration described above, a cooling method described below is applied to cool the combustor 2 and the gas turbine 3.
In the prior art, a fluid such as air discharged from the compressor 1 or bleed air is generally used. After cooling , the fluid is discharged into the combustor 2 or the gas path of the gas turbine 3. Therefore, decreasing the amount of air supplied to the combustion in the combustor 2 increases the NOx, in the cooling air gas turbine 3 is mixed into the working gas to lower the gas temperature, thus causing reduced efficiency.

【0004】そこで、図2に示す従来例では、蒸気ター
ビン6の中間段からの蒸気をライン9に通して燃焼器2
及びガスタービン3に導入し、燃焼器内筒及びタービン
中空静翼の冷却に供するようにしている。このような蒸
気冷却の場合、燃焼器2に流入する空気のすべてが燃焼
用空気に使われるため、低NOx化を図ることができ、
また、冷却空気の圧縮動力が不要となるため、ガスター
ビン効率が向上する。
Therefore, in the conventional example shown in FIG. 2, the steam from the intermediate stage of the steam turbine 6 is passed through a line 9 to pass through the combustor 2.
And the gas turbine 3 to cool the inner cylinder of the combustor and the turbine stationary vane. For such steam cooling, since all of the air entering the combustor 2 is used in the combustion air, it is possible to achieve NOx reduction,
Further, since the power for compressing the cooling air is not required, the efficiency of the gas turbine is improved.

【0005】[0005]

【発明が解決しようとする課題】しかし、図2に示した
従来例においては、燃焼器2及びガスタービン3の冷却
に使用された蒸気は燃焼器2内又はガスタービン3のガ
スパス内に放出されているため、次のような問題点が発
生していた。
However, in the conventional example shown in FIG. 2 , the steam used for cooling the combustor 2 and the gas turbine 3 is discharged into the combustor 2 or the gas path of the gas turbine 3. Therefore, the following problems have occurred.

【0006】すなわち、蒸気タービン6で真空まで膨脹
する蒸気が大気圧までしか膨脹せず、コンバインドプラ
ント熱効率を低下させていた。また、燃焼器2について
も、冷却蒸気をガスタービン3の所定入口温度まで加熱
するために余分の燃料を必要とし、プラント熱効率低下
の原因となっていた。更に、冷却蒸気が回収されないた
めに余分な補給水を必要とし、蒸留水補給のための水処
理設備及び運転費を増大させていた。
That is, the steam that expands to a vacuum in the steam turbine 6 expands only to the atmospheric pressure, and the thermal efficiency of the combined plant is reduced. In addition, the combustor 2 also needs extra fuel to heat the cooling steam to a predetermined inlet temperature of the gas turbine 3, which causes a reduction in plant thermal efficiency. Further, since the cooling steam is not recovered, extra makeup water is required, and the water treatment equipment for replenishing distilled water and the operating cost are increased.

【0007】本発明は、このような従来技術の課題を解
決するためになされたもので、ガスタービン・蒸気ター
ビンコンバインドプラントにおいて、コンバインド熱効
率を向上でき、かつ余分な燃料および補給水を必要とし
ないガスタービンの蒸気冷却方法及び装置を提供するこ
とを目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art. In a gas turbine / steam turbine combined plant, the combined thermal efficiency can be improved and no extra fuel and makeup water are required. An object of the present invention is to provide a method and an apparatus for cooling steam in a gas turbine.

【0008】[0008]

【課題を解決するための手段】上記の課題を解決するた
めに、請求項1の本発明に係るガスタービンの蒸気冷却
方法は、ガスタービンと、ガスタービンからの排ガス
が供給される排ガスボイラと、排ガスボイラからの蒸
気が供給される蒸気タービンとを備えるコンバインドプ
ラントにおいて、前記蒸気タービンの中間段からの蒸気
をガスタービンの燃焼器及びタービン中空静翼に導いて
冷却に供し、冷却後の蒸気を回収して、前記蒸気タービ
ンの中間段の後流側に導くようにしたものである。
た、請求項2に係る本発明の蒸気冷却装置は、ガスター
ビンと、該ガスタービンからの排ガスが供給される排ガ
スボイラと、該排ガスボイラからの蒸気が供給される蒸
気タービンとを備えるコンバインドプラントにおいて、
前記蒸気タービンの中間段からの蒸気を前記ガスタービ
ンの燃焼器及び前記ガスタービンの中空静翼に導いて該
燃焼器及び該中空静翼を冷却するように前記蒸気タービ
ン、前記ガスタービン及び前記燃焼器を相互に接続する
抽気ラインと、前記冷却に使用後の蒸気を回収して、前
記蒸気タービンの前記中間段の後流側に導くように前記
蒸気タービン、前記ガスタービン及び前記燃焼器を相互
に接続する回収ラインとを有することを特徴とするもの
である。
According to a first aspect of the present invention, there is provided a gas turbine steam cooling method comprising: a gas turbine; and an exhaust gas boiler to which exhaust gas from the gas turbine is supplied. When, in the combined plant and a steam turbine steam is supplied from the exhaust gas boiler, the steam from the steam turbine at an intermediate stage subjected to cooling leading to a combustor and a turbine hollow stator blade of the gas turbine, cooled the vapor was collected, is obtained by the direct on the downstream side of the intermediate stage of the steam turbine. Ma
The steam cooling device of the present invention according to claim 2 is a gas cooling device.
A bin and an exhaust gas to which exhaust gas from the gas turbine is supplied.
A boiler and a steam supplied with steam from the exhaust gas boiler.
In a combined plant with an air turbine,
The steam from the intermediate stage of the steam turbine is
To the gas turbine combustor and the hollow vanes of the gas turbine.
A steam turbine for cooling the combustor and the hollow vane;
Interconnect the gas turbine and the combustor
The extraction line and the steam used for the cooling are recovered and
So that it is guided to the downstream side of the intermediate stage of the steam turbine.
Steam turbine, the gas turbine and the combustor
Having a recovery line connected to the
It is.

【0009】[0009]

【作用】上記の蒸気冷却方法及び装置によれば、ガスタ
ービン冷却後の蒸気は蒸気タービンで真空まで膨脹して
復水する。また、冷却蒸気は所定の蒸気タービン入口温
度まで加熱される。このため、余分の燃料を必要としな
い。したがって、コンバインドプラント熱効率が向上
し、余分な補給水が不要となる。
According to the above steam cooling method and apparatus , the steam after cooling the gas turbine is expanded to a vacuum by the steam turbine and condensed. Further, the cooling steam is heated to a predetermined steam turbine inlet temperature. Therefore, no extra fuel is required. Therefore, the thermal efficiency of the combined plant is improved, and extra makeup water is not required.

【0010】[0010]

【実施例】以下、図1を参照して本発明の一実施例につ
いて詳細に説明する。図1は本実施例に係る蒸気冷却
法及び装置を採用したガスタービン・蒸気タービンコン
バインドプラントの系統図であり、図2に示したものと
同一の部分には同一の符号を付して、重複する説明は省
略する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG. FIG. 1 shows a steam cooling method according to this embodiment.
FIG. 3 is a system diagram of a gas turbine / steam turbine combined plant employing the method and the apparatus , in which the same parts as those shown in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

【0011】図1に示すように、本実施例によれば、蒸
気タービン6の中間段からの蒸気は抽気ライン9を通し
てガスタービン3の燃焼器2及びガスタービン3に導か
れ、それぞれ燃焼器内筒及びタービン中空静翼(図示せ
ず)の冷却に供される。そして、冷却後の蒸気は、回収
ライン10を通して回収されて、ガスタービン3の外部
に導かれ、再び蒸気タービン6の抽気段すなわち前記中
間段の後流側に流入して膨脹する。
As shown in FIG. 1, according to the present embodiment, the steam from the intermediate stage of the steam turbine 6 is guided to the combustor 2 and the gas turbine 3 of the gas turbine 3 through the bleed line 9, and each of the steam in the combustor Cylinder and turbine hollow vanes (not shown)
) Is provided for cooling. Then, the cooled steam is recovered through the recovery line 10, guided to the outside of the gas turbine 3, and again in the bleeding stage of the steam turbine 6, that is, in the middle of
It flows into the downstream side of the middle stage and expands.

【0012】なお、この種ガスタービンの燃焼器内筒に
は、フィルム冷却によらず、対流冷却によって内筒壁面
の冷却を図る二重壁構造のものが使われる。
A gas turbine inner cylinder of this type has a double wall structure in which the inner cylinder wall is cooled by convection cooling instead of film cooling.

【0013】[0013]

【発明の効果】以上述べたように、本発明によれば、ガ
スタービン・蒸気タービンコンバインドプラントにおい
て、蒸気タービンの中間段からの蒸気をガスタービンの
燃焼器及びタービン中空静翼の冷却に供し、冷却後の蒸
気をガスタービンの外部に導き、再び蒸気タービンで膨
脹させるようにしているので、冷却蒸気が燃焼ガスに混
入せず、また冷却後蒸気タービンへ回収されるため、コ
ンバインドプラント熱効率が向上するとともに、冷媒蒸
気は所定の蒸気タービン入口温度まで加熱されるため余
分の燃料を必要とせず、かつ冷却蒸気に対応していた補
給水も不要となり、設備費及び運転費が大幅に減少する
などの効果を奏する。
As described above, according to the present invention, in the gas turbine / steam turbine combined plant, the steam from the intermediate stage of the steam turbine is used for cooling the combustor of the gas turbine and the turbine vane. Since the cooled steam is led to the outside of the gas turbine and expanded again by the steam turbine, the cooling steam is not mixed into the combustion gas and is recovered by the steam turbine after cooling, improving the thermal efficiency of the combined plant. At the same time, the refrigerant vapor is heated to a predetermined steam turbine inlet temperature, so that no extra fuel is required, and there is no need for make-up water corresponding to the cooling steam, which significantly reduces equipment and operating costs. Has the effect of

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明の一実施例に係る蒸気冷却方法及び装
を採用したガスタービン・蒸気タービンコンバインド
プラントの系統図である。
FIG. 1 shows a steam cooling method and apparatus according to an embodiment of the present invention.
It is a system diagram of a gas turbine and steam turbine combined plant employing a location.

【図2】 従来の蒸気冷却方法を採用したガスタービン
・蒸気タービンコンバインドプラントの系統図である。
FIG. 2 is a system diagram of a gas turbine / steam turbine combined plant employing a conventional steam cooling method.

【符号の説明】 1…圧縮機、2…燃焼器、3…ガスタ
ービン、4…排ガスボイラ、5…煙突、6…蒸気タービ
ン、7…復水器、8…発電機、9…抽気ライン、10…
回収ライン。
[Description of Signs] 1 ... Compressor, 2 ... Combustor, 3 ... Gas turbine, 4 ... Exhaust gas boiler, 5 ... Chimney, 6 ... Steam turbine, 7 ... Condenser, 8 ... Generator, 9 ... Bleed line, 10 ...
Collection line.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−176309(JP,A) 特開 昭63−88227(JP,A) (58)調査した分野(Int.Cl.6,DB名) F02C 7/18 F01K 17/04 F01K 23/10 F02C 6/18 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-176309 (JP, A) JP-A-63-88227 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) F02C 7/18 F01K 17/04 F01K 23/10 F02C 6/18

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 ガスタービンと、ガスタービンからの
排ガスが供給される排ガスボイラと、排ガスボイラか
らの蒸気が供給される蒸気タービンとを備えるコンバイ
ンドプラントにおいて、前記蒸気タービンの中間段から
の蒸気を前記ガスタービンの燃焼器及び前記ガスタービ
ンの中空静翼に導いて冷却に供し、該冷却に使用された
後の蒸気を回収して、前記蒸気タービンの前記中間段の
後流側に導くことを特徴とするガスタービンの蒸気冷却
方法。
1. A gas turbine, and an exhaust gas boiler exhaust gas is supplied from the gas turbine, the combined plant and a steam turbine steam from the exhaust gas boiler is supplied from the steam turbine at an intermediate stage the vapor of the gas turbine combustor and said gas turbine
The steam turbine is guided to a hollow stationary blade of the steam turbine for cooling, and the steam used for the cooling is collected and guided to a downstream side of the intermediate stage of the steam turbine. Steam cooling method for gas turbines.
【請求項2】 ガスタービンと、該ガスタービンからの
排ガスが供給される排ガスボイラと、該排ガスボイラか
らの蒸気が供給される蒸気タービンとを備えるコンバイ
ンドプラントにおいて、前記蒸気タービンの中間段から
の蒸気を前記ガスタービンの燃焼器及び前記ガスタービ
ンの中空静翼に導いて該燃焼器及び該中空静翼を冷却す
るように前記蒸気タービン、前記ガスタービン及び前記
燃焼器を相互に接続する抽気ラインと、前記冷却に使用
後の蒸気を回収して、前記蒸気タービンの前記中間段の
後流側に導くように前記蒸気タービン、前記ガスタービ
ン及び前記燃焼器を相互に接続する回収ラインとを有す
ることを特徴とするガスタービンの蒸気冷却装置
2. A combined plant comprising: a gas turbine; an exhaust gas boiler to which exhaust gas from the gas turbine is supplied; and a steam turbine to which steam from the exhaust gas boiler is supplied. An extraction line interconnecting the steam turbine, the gas turbine, and the combustor to direct steam to the combustor of the gas turbine and the hollow vanes of the gas turbine to cool the combustor and the hollow vanes. And a recovery line interconnecting the steam turbine, the gas turbine, and the combustor so as to recover steam used for the cooling and guide the steam to a downstream side of the intermediate stage of the steam turbine. A steam cooling device for a gas turbine, comprising:
JP3327079A 1991-11-15 1991-11-15 Gas turbine steam cooling method and apparatus Expired - Fee Related JP2984442B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3327079A JP2984442B2 (en) 1991-11-15 1991-11-15 Gas turbine steam cooling method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3327079A JP2984442B2 (en) 1991-11-15 1991-11-15 Gas turbine steam cooling method and apparatus

Publications (2)

Publication Number Publication Date
JPH05141267A JPH05141267A (en) 1993-06-08
JP2984442B2 true JP2984442B2 (en) 1999-11-29

Family

ID=18195056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3327079A Expired - Fee Related JP2984442B2 (en) 1991-11-15 1991-11-15 Gas turbine steam cooling method and apparatus

Country Status (1)

Country Link
JP (1) JP2984442B2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5431007A (en) * 1994-03-04 1995-07-11 Westinghouse Elec Corp Thermochemically recuperated and steam cooled gas turbine system
DE4409567A1 (en) * 1994-03-21 1995-09-28 Abb Management Ag Process for cooling thermally loaded components of a gas turbine group
US5778657A (en) * 1995-09-22 1998-07-14 Kabushiki Kaisha Toshiba Combined cycle power plant
DE19716721A1 (en) * 1997-04-21 1998-11-12 Siemens Ag Method of operating a gas turbine and gas turbine operating thereafter
WO1998059158A1 (en) * 1997-06-24 1998-12-30 Mitsubishi Heavy Industries, Ltd. Steam cooling apparatus for gas turbine
EP2187004A1 (en) * 2008-11-13 2010-05-19 Siemens Aktiengesellschaft Internal casing for a current machine
US8943836B2 (en) 2009-07-10 2015-02-03 Nrg Energy, Inc. Combined cycle power plant

Also Published As

Publication number Publication date
JPH05141267A (en) 1993-06-08

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