Configurations and methods for power generation with integrated LNG regasification
First Claim
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1. A power plant, comprising:
- a first heat exchanger that is configured to receive LNG and to provide refrigeration to a working fluid to thereby generate heated LNG, and an expander configured to receive the working fluid to thereby drive a generator and to produce an expander discharge;
wherein the first heat exchanger is further configured to allow heat exchange between the expander discharge and the LNG;
a second heat exchanger that is configured to receive the heated LNG and to provide refrigeration to a heat transfer medium fluid to thereby generate vaporized LNG; and
a third and a fourth heat exchanger, configured to receive the heat transfer medium and to provide refrigeration for an intake air cooler and a steam turbine cycle, respectively.
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Abstract
LNG cold is used in a plurality of cycles in a combined power plant to increase power output. Especially preferred plant configurations integrate a combined cycle power plant with a regasification operation in which in a first stage LNG cold provides cooling in an open or closed power cycle. Most preferably, a significant portion of the LNG is vaporized in the first stage. In a second stage LNG cold provides cooling for a heat transfer medium that is used to provide refrigeration for the cooling water to a steam power turbine and for an air intake chiller of a combustion turbine in the power plant.
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Citations
20 Claims
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1. A power plant, comprising:
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a first heat exchanger that is configured to receive LNG and to provide refrigeration to a working fluid to thereby generate heated LNG, and an expander configured to receive the working fluid to thereby drive a generator and to produce an expander discharge; wherein the first heat exchanger is further configured to allow heat exchange between the expander discharge and the LNG; a second heat exchanger that is configured to receive the heated LNG and to provide refrigeration to a heat transfer medium fluid to thereby generate vaporized LNG; and a third and a fourth heat exchanger, configured to receive the heat transfer medium and to provide refrigeration for an intake air cooler and a steam turbine cycle, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a plant, comprising:
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heat exchanging LNG in a first heat exchanger against an expander discharge stream to provide refrigeration to a working fluid and to thereby generate heated LNG; using the working fluid to drive an expander that is coupled to a generator to thereby generate electricity and the expander discharge stream; further heating the heated LNG in a second heat exchanger to provide refrigeration to a heat transfer medium fluid and to thereby generate vaporized LNG; and using the heat transfer medium in third and fourth heat exchangers to provide refrigeration for an intake air cooler and a steam turbine cycle, respectively. - View Dependent Claims (17, 18, 19, 20)
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Specification