Improved liquefied natural gas fueled combined cycle power plant
First Claim
1. A method for enhancing the capacity and the efficiency of a combined cycle plant which comprises:
- regasifying LNG to convert to natural gas;
chilling a primary heat exchange fluid by placing said primary heat exchange fluid in heat exchange relationship with a secondary heat exchange fluid which secondary heat exchange fluid is cooled by the conversion of the LNG to the natural gas;
flowing the chilled primary heat exchange fluid through a heat exchange zone through which zone flows the intake air for an air compressor to cool and densify the intake air;
flowing subsequently the primary heat exchange fluid through a condenser to condense the spent steam from a high-pressure steam turbine; and
placing subsequently the primary heat exchange fluid in heat exchange relationship with the secondary heat exchange fluid.
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Accused Products
Abstract
A process and system which improves the capacity and efficiency of a combined cycle power plant. A LNG supply system fuels the combined cycle plant. Gasified LNG in a combustor mixes with the air from the air compressor to provide the hot combustion gas for the gas turbine. The expanding LNG is used to chill a primary heat exchange fluid, e.g. water, which primary heat exchange fluid cools and densifies the intake air for the air compressor. Subsequently, the primary heat exchange fluid is used to condense the spent steam discharged from the steam turbine. The primary heat exchange fluid is then re-chilled and recycled to cool and densify the intake air.
198 Citations
17 Claims
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1. A method for enhancing the capacity and the efficiency of a combined cycle plant which comprises:
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regasifying LNG to convert to natural gas; chilling a primary heat exchange fluid by placing said primary heat exchange fluid in heat exchange relationship with a secondary heat exchange fluid which secondary heat exchange fluid is cooled by the conversion of the LNG to the natural gas; flowing the chilled primary heat exchange fluid through a heat exchange zone through which zone flows the intake air for an air compressor to cool and densify the intake air; flowing subsequently the primary heat exchange fluid through a condenser to condense the spent steam from a high-pressure steam turbine; and placing subsequently the primary heat exchange fluid in heat exchange relationship with the secondary heat exchange fluid. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for enhancing the capacity and efficiency of a combined cycle plant which combined cycle plant comprises a gas turbine plant, a waste-heat boiler, a steam turbine plant and a LNG supply system, the LNG supply system comprising a regasifier and a chiller in heat exchange relationship with one another which method comprises:
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regasifying the LNG in the regasifier to convert the same to natural gas; flowing a primary heat exchange fluid through the chiller; flowing a secondary heat exchange fluid between the regasifier and the chiller both to control the gasification of the LNG and the chilling of the primary heat exchange fluid; flowing the gasified LNG to a combustor in the gas turbine plant; flowing the chilled primary heat exchange fluid through a heat exchange zone through which zone flows the intake air for an air compressor in the gas turbine plant, the primary heat exchange fluid cooling and densifying the intake air; discharging the air from the air compressor and mixing the same with the gasified LNG in the combustor to generate hot combustion gases; flowing the hot combustion gases to a turbine in the gas turbine plant to drive the same; discharging hot exhaust gases from the turbine and flowing the same to the waste-heat boiler; convening liquid flowing through the waste-heat boiler to steam and discharging said steam; flowing the discharged stream to a steam turbine in the steam turbine plant to drive the same and to form spent steam; flowing the spent steam through a condenser; flowing the primary heat exchange fluid from the heat exchange zone upstream of the air compressor through the condenser to condense the spent steam; and flowing the primary heat exchange fluid from the condenser to the chiller in the LNG supply system. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A LNG combined cycle plant system which comprises:
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a LNG fuel supply system which system includes; a source of LNG; a regasifier for the LNG in fluid flow communication with source of LNG; a chiller in heat exchange relationship with the regasifier; means to flow a secondary heat exchange fluid between the regasifier and the chiller to chill a primary heat exchange fluid; a gas turbine plant which comprises; an air compressor; an air intake duct upstream of said air compressor; a second heat exchanger disposed in heat exchange relationship with the air intake system; means to flow the primary heat exchange fluid through the heat exchanger to cool and densify the intake air flowing through the air duct and into the compressor; a gas turbine; a combuster interposed between the air compressor and the gas turbine, the combuster providing the energy to drive the gas turbine; a generator coupled to the gas turbine; and means to exhaust the gas from the gas turbine; a waste-heat boiler downstream of the gas turbine which comprises; means to introduce the exhaust gas from the gas turbine into the waste-gas boiler; means to create high pressure steam and means to discharge the high pressure steam from the waste-heat boiler; a steam turbine plant which comprises; a steam turbine downstream of and adapted to receive the high pressure steam from the waste-heat boiler; a generator coupled to and driven by the steam turbine; a condenser to condense the spent steam discharged from the steam turbine the primary heat exchange fluid flowing through the condenser; means to recycle the condensate to the waste-heat boiler; and means to flow the primary heat exchange fluid from the condenser to the chiller. - View Dependent Claims (17)
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Specification