Heat recovery gas turbine in combined brayton cycle power generation
First Claim
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1. A power generator comprising:
- a first Brayton cycle engine comprising a first airflow, a fuel input, and a fuel combustion in the first airflow producing combustion gas exhaust, the first Brayton cycle engine producing a first shaft power; and
a second Brayton cycle engine comprising a second airflow and a heat exchanger that transfers heat from the first combustion gas exhaust to the second airflow, the second Brayton cycle engine producing a second shaft power.
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Abstract
A combined Brayton cycle power plant (5). A combustion gas turbine engine (21) in the power plant uses a first Brayton cycle (20), and produces waste heat in an exhaust combustion gas (36). A heat exchanger (58) transfers the waste heat to a compressed working airflow (56) for a second Brayton cycle (50) in a heat recovery gas turbine engine (51). The heat transfer lowers the temperature of the combustion exhaust gas (36) to within an operating range of a conventional selective catalytic reduction unit (80), for efficient reduction of nitrogen oxide emissions to meet environmental regulations.
48 Citations
12 Claims
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1. A power generator comprising:
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a first Brayton cycle engine comprising a first airflow, a fuel input, and a fuel combustion in the first airflow producing combustion gas exhaust, the first Brayton cycle engine producing a first shaft power; and
a second Brayton cycle engine comprising a second airflow and a heat exchanger that transfers heat from the first combustion gas exhaust to the second airflow, the second Brayton cycle engine producing a second shaft power. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for increasing efficiency and reducing nitrogen oxide emissions in a combustion gas turbine power generator of a type that produces a combustion gas exhaust, the method comprising:
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ducting the combustion gas exhaust to a heat recovery gas turbine engine that compresses a working airflow, then transfers heat energy from the combustion gas exhaust to the working airflow, then expands the working airflow in a turbine section to produce a shaft power; and
passing the combustion gas exhaust through a selective catalytic reduction process downstream of the heat recovery gas turbine engine to reduce a nitrogen oxide emission in the combustion gas exhaust. - View Dependent Claims (8)
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9. A power generator comprising:
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a combustion gas turbine engine that draws a first airflow, compresses it, mixes it with fuel, then combusts the first airflow and fuel mixture producing a combustion gas flow, then expands the combustion gas flow in a turbine section to produce a first shaft power, then exhausts the combustion gas flow;
a heat recovery gas turbine engine that draws a second airflow, compresses it, then heats it in a heat exchanger by transferring heat from the exhausted combustion gas flow to the compressed second airflow, then expands the compressed heated second airflow in a turbine section to produce a second shaft power; and
a selective catalytic reduction unit that receives the exhausted combustion gas flow downstream of the heat exchanger. - View Dependent Claims (10, 11, 12)
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Specification