Emission reducing louvers
AssigneeMitsubishi Power Americas, Inc.
InventorSchwartz Thangyah
Life of this patent
Estimating the term…
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 emission filter medium panels extend contiguously across the flow space of the duct such that the exhaust gas flows through the emission medium panels and a second position where adjacent emission filter medium panels extend contiguously across the flow space of the duct and include spaces therebetween such that the exhaust gas flows around the emission medium panels;
- an actuator to move the plurality of panels between the first position and the second position;
- and
- wherein the plurality of emission medium panels comprises catalyst panels.
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);
- rotating each of a plurality of emission medium louvers about major axes extending substantially across the exhaust duct 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
- rotating each of the plurality of emission medium louvers about the major axes to an open state to decrease exposure of the plurality of emission medium louvers to the exhaust gas flow;
- wherein the emission medium panels are exposed to the exhaust gas flow in the closed state and the open state;
- and
- wherein the plurality of emission medium panels comprises catalyst panels.
Dependencies are inferred from the claim text.