A combined cycle power plant of the present invention is configured of a compressor; a combustor for combusting compressed air compressed by the compressor together with supplied fuel; a gas turbine driven by a combustion gas exhausted from the combustor; a heat recovery steam generator for recoveri
A combined cycle power plant of the present invention is configured of a compressor; a combustor for combusting compressed air compressed by the compressor together with supplied fuel; a gas turbine driven by a combustion gas exhausted from the combustor; a heat recovery steam generator for recovering high temperature exhaust heat exhausted from the gas turbine; a steam turbine driven by steam obtained from the heat recovery steam generator; and an exhaust gas duct having an HRSG inlet duct that is provided between the gas turbine and the heat recovery steam generator and introduces an exhaust passage into the heat recovery steam generator, and a bypass stack that leads the exhaust gas outside, wherein the exhaust duct is configured of a damper, a damper drive for changing any of angle and opening of the damper, and a guide mechanism for preventing a vibration of the damper.
대표청구항▼
What is claimed is: 1. A combined cycle power plant comprising: a compressor; a combustor for combusting supplied fuel together with compressed air compressed by said compressor; a gas turbine driven by a combustion gas exhausted from said combustor; a heat recovery steam generator (HRSG) for recov
What is claimed is: 1. A combined cycle power plant comprising: a compressor; a combustor for combusting supplied fuel together with compressed air compressed by said compressor; a gas turbine driven by a combustion gas exhausted from said combustor; a heat recovery steam generator (HRSG) for recovering high temperature gas exhausted from said gas turbine; a steam turbine driven by steam obtained from said heat recovery steam generator; an exhaust gas duct, provided between said gas turbine and said heat recovery steam generator, comprising an HRSG inlet duct that introduces said exhaust gas into said heat recovery steam generator and a bypass stack that leads said exhaust gas outside; a damper provided in said exhaust gas duct and configured to control a ratio of an exhaust amount of said exhaust gas to said bypass stack and an introduction amount of said exhaust gas into said HRSG inlet duct by changing any of an angle and opening of said damper; a damper drive for changing any of the angle and opening of said damper so that an exhaust amount of said exhaust gas to said bypass stack decreases in increasing an introduction amount of said exhaust gas into said HRSG inlet ducts; a control device operatively connected with the damper drive to control the damper drive based on any of an output value and exhaust gas temperature of the gas turbine so as to selectively fully open the bypass stack and fully close the HRSG inlet duct upon start up of the combined cycle power plant, to decrease said exhaust amount of said exhaust gas to the bypass stack and increase said introduction amount of said exhaust gas to the HRSG inlet duct upon any of the output value and exhaust gas temperature of the gas turbine being a predetermined value, and to fully close the bypass stack and fully open the HRSG inlet duct; and a guide mechanism for preventing a vibration of said damper, said guide mechanism including a track between an inner face of a side wall of said exhaust gas duct and a side face of said damper and extending between the fully closed position for said bypass stack and the fully closed position for said HRSG inlet duct. 2. A combined cycle power plant according to claim 1, wherein said heat recovery steam generator is a once through type heat recovery steam generator. 3. A combined cycle power plant according to claim 1, wherein said damper drive comprises a toggle linkage for supporting said damper and a drive shaft for transmitting a driving force to said toggle linkage, and wherein when said damper reaches a position that shuts off said bypass stack, said toggle linkage and said drive shaft are at positions which said exhaust gas does not directly impinge there upon. 4. A combined cycle power plant according to claim 2, wherein said damper drive comprises a toggle linkage for supporting said damper and a drive shaft for transmitting a driving force to said toggle linkage, and wherein when said damper reaches a position that shuts off said bypass stack, said toggle linkage and said drive shaft are at positions which said exhaust gas does not directly impinge there upon. 5. A combined cycle power plant comprising: a compressor; a combustor for combusting supplied fuel together with compressed air compressed by said compressor; a gas turbine driven by a combustion gas exhausted from said combustor; a heat recovery steam generator (HRSG) for recovering high temperature gas exhausted from said gas turbine; a steam turbine driven by steam obtained from said heat recovery steam generator; a plurality of exhaust gas ducts provided between said gas turbine and said heat recover steam generator, each comprising an HRSG inlet duct and a bypass stack, said HRSG inlet duct introducing said exhaust gas into said heat recovery steam generator and said bypass stack leading said exhaust gas outside; a damper provided in each said exhaust gas duct and a position nearer to said heat recovery steam generator than said bypass stack and configured to shut off the introduction of said exhaust gas into said heat recovery steam generator; a damper drive that changes any of an angle and opening of said each damper so that an exhaust amount of said exhaust gas to said bypass stack decreases in increasing the introduction amount of said exhaust gas into said HRSG inlet duct, and makes said damper selectively perform an opening or closing movement; a control device operatively connected with said damper drive for selectively opening and closing each said damper; and a guide mechanism for preventing a vibration of said damper and guiding said damper, said guide mechanism including a track between an inner face of a side wall of said exhaust gas duct and a side face of said damper and extending between fully open position and fully closed position for said HRSG inlet duct. 6. A combined cycle power plant according to claim 5, wherein said heat recovery steam generator is a once through type heat recovery steam generator. 7. A combined cycle power plant according to claim 1, wherein said guide mechanism includes a step provided on said inner face of said side wall of said exhaust gas duct, and a projection provided on said side face of said damper so as to be freely movably guided while abutting said step. 8. A combined cycle power plant according to claim 1, wherein said guide mechanism includes a projection provided on said inner face of said side wall of said exhaust gas duct and a depression provided on a side face of said damper, said projection being insertable in said depression which guides said damper. 9. A combined cycle power plant according to claim 5, wherein said guide mechanism includes a step provided said an inner face of said side wall of said exhaust gas duct, and a projection provided on said side face of said damper so as to be freely movably guided while abutting with said step. 10. A combined cycle power plant according to claim 5, wherein said guide mechanism includes a projection provided on said inner face of said side wall of said exhaust gas duct and a depression provided on said side face of said damper, said projection being insertable in said depression which guides said damper. 11. A combined cycle power plant according to claim 5, wherein said control device is configured to control said damper device, based on any of an output value and exhaust gas temperature of said gas turbine, to open one of said dampers upon any of the output value and the exhaust gas temperature of said gas turbine being a predetermined value, and to open a remaining damper of said dampers. 12. A combined cycle power plant comprising: a compressor; a combustor for combusting supplied fuel together with compressed air compressed by said compressor; a gas turbine driven by a combustion gas exhausted from said combustor; a heat recovery steam generator (HRSG) for recovering a high temperature gas exhausted from said gas turbine; a steam turbine driven by steam obtained from said heat recovery steam generator; an exhaust gas duct, provided between said gas turbine and said heat recovery steam generator, comprising an HRSG inlet duct that introduces said exhaust gas into said heat recovery steam generator and a bypass stack that leads said exhaust gas outside; a damper provided in said exhaust gas duct and configured to control a ratio of an exhaust amount of said exhaust gas to said bypass stack and an introduction amount of said exhaust gas into said HRSG inlet duct by changing any of an angle and opening of said damper; a damper drive for changing any of the angle and opening of said damper so that an exhaust amount of said exhaust gas to said bypass stack decreases in increasing the introduction amount of said exhaust gas into said HRSG inlet duct; and a guide mechanism for preventing a vibration of said damper, said guide mechanism including a track between an inner face of a side wall of said exhaust gas duct and a side face of said damper and extending between the fully closed position for said bypass stack and fully closed position for said HRSG inlet duct.
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이 특허에 인용된 특허 (4)
Duffy Thomas E. (San Diego CA) Archibald John P. (La Jolla CA) Campbell Alan H. (Encinitas CA), Combined cycle power plant.
Chillar, Rahul; Rogers, David L.; Nenmeni, Vijay; Mestroni, Julio, Apparatus for starting up combined cycle power systems and method for assembling same.
Mathai, George Vargese; Scipio, Alston Ilford; Jordan, Jr., Harold Lamar; Ekanayake, Sanji; Klosinski, Joseph Philip, System and method for controlling gas turbine output via an exhaust damper.
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