Emission reducing louvers
AssigneeMitsubishi Hitachi Power Systems Americas, Inc.
InventorSchwartz Thangyah
Life of this patent
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Abstract
An emissions reduction system for a combined cycle power plant having a gas turbine engine and a heat recovery steam generator (HRSG) can comprise a duct defining a flow space configured to receive exhaust gas from the gas turbine and convey the exhaust gas into the HRSG, and a louver system coupled to the duct that can comprise a plurality of emission medium panels extending across the flow space, the emission medium panels configured to be moved between a first position where adjacent filter medium panels extend contiguously across the flow space of the duct and a second position where adjacent filter medium panels include spaces therebetween to provide an unobstructed flow path and an actuator to move the plurality of panels between the first position and the second position.
Claims20
An emissions reduction system for a combined cycle power plant having a gas turbine engine and a heat recovery steam generator (HRSG), the emissions reduction system comprising:
- a duct defining a flow space configured to receive exhaust gas from the gas turbine and convey the exhaust gas into the HRSG;
- and
- a louver system coupled to the duct, the louver system comprising:
- a plurality of emission medium panels extending across the flow space, the emission medium panels configured to be moved between a first position where adjacent filter medium panels extend contiguously across the flow space of the duct and a second position where adjacent filter medium panels include spaces therebetween to provide an unobstructed flow path;
- and
- an actuator to move the plurality of panels between the first position and the second position.
A method for controlling emissions during low load conditions of a gas turbine engine used in a combined cycle power plant, the method comprising:
- starting the gas turbine engine that generates an exhaust gas flow;
- directing the exhaust gas flow of the gas turbine engine through a primary passage of an exhaust duct coupled to a heat recovery steam generator (HRSG);
- closing a plurality of emission medium louvers to a closed state to increase exposure of the plurality of emission medium louvers to the exhaust gas flow;
- attaining a threshold operation parameter of the combined cycle power plant;
- and
- opening the plurality of emission medium louvers to an open state to decrease exposure of the plurality of emission medium louvers to the exhaust gas flow.
The method 11, wherein opening the plurality of emission medium louvers comprises disposing individual panels of the plurality of emission medium louvers substantially parallel to a wall of the inlet duct, the wall of the inlet duct disposed at an oblique angle to a bulk flow direction of the exhaust gas.
Dependencies are inferred from the claim text.