Method of heating gas turbine fuel in a combined cycle power plant using multi-component flow mixtures
First Claim
1. In a combined cycle power generating system having a plurality of turbines, including first and second vapor turbines, and a gas turbine for driving one or more generators for generating electricity or mechanical work, a method of increasing the efficiency of the system, comprising the steps of:
- (a) expanding a working fluid through the first vapor turbine;
(b) reheating expanded working fluid from the first vapor turbine;
(c) expanding the reheated working fluid through the second vapor turbine;
(d) cooling the working fluid exhausted from the second vapor turbine; and
(e) heating fuel for combustion in the gas turbine by passing the fuel in heat exchange relation with the working fluid expanded through said second turbine.
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Accused Products
Abstract
A combined cycle power generating system includes high, intermediate and low pressure vapor turbines for driving a generator or other load by expanding a multi-component fluid mixture through the turbines. A gas turbine is drivingly connected to the generator or other load. The expanded multi-component mixture exhausted from the intermediate pressure turbine flows in heat exchange relation with the fuel inlet to the combustor for the gas turbine whereby the gas turbine fuel is preheated to reduce fuel consumption of the gas turbine and increase combined cycle efficiency.
98 Citations
14 Claims
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1. In a combined cycle power generating system having a plurality of turbines, including first and second vapor turbines, and a gas turbine for driving one or more generators for generating electricity or mechanical work, a method of increasing the efficiency of the system, comprising the steps of:
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(a) expanding a working fluid through the first vapor turbine; (b) reheating expanded working fluid from the first vapor turbine; (c) expanding the reheated working fluid through the second vapor turbine; (d) cooling the working fluid exhausted from the second vapor turbine; and (e) heating fuel for combustion in the gas turbine by passing the fuel in heat exchange relation with the working fluid expanded through said second turbine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a combined cycle power generating system having a plurality of turbines including first and second vapor turbines and a gas turbine for driving one or more generators for generating electricity or mechanical work, a method of increasing the efficiency of the system, comprising the steps of:
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expanding through a first vapor turbine a working fluid comprised of a mixture of dissimilar components having different boiling points at identical pressure; reheating the expanded working fluid mixture from the first vapor turbine; expanding the reheated working fluid mixture through the second vapor turbine; heating fuel for combustion in the gas turbine by passing fuel in heat exchange relation with the working fluid mixture expanded through said second vapor turbine; and passing the working fluid, subsequent to heating the fuel, to a distillation/condensation subsystem for condensation. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification