Patent ID: 6125623
Filing Date: 2000-10-03
Classification: F01K,F22B,Y02E

Abstract:
A method of operating exchanger in a combustion turbine system, comprising:providing a heat exchanger that has a bypass stack disposed between a first heat transfer stage having a first coolant fluid conduit and a second heat transfer stage having a second coolant fluid conduit, wherein the first and second coolant conduits are connected in series with a first isolation valve disposed there between, a damper disposed between the second heat transfer stage and the bypass stack, a first bleed line in the first coolant fluid conduit for directing a portion of coolant flowing through the first coolant conduit to a cooling circuit within a component of the combustion turbine system when in an open position, a second bleed line in the second coolant fluid conduit for directing a portion of coolant flowing through the second coolant conduit to the cooling circuit within the component of the combustion turbine system when in an open position, a first feed water circuit for circulating coolant in the first coolant fluid conduit, a second feed water circuit for circulating coolant in the second coolant fluid conduit, and a second isolation valve in the first feed water circuit for isolating the first feed water circuit from the first coolant fluid conduit when in the closed position;positioning the damper in a first position to direct a hot gas flowing from the first heat transfer stage and the bypass stack, opening the second isolation valve and the first bleed line, and closing the first isolation valve, so that feed water circulates in the first coolant conduit is converted to steam which is conveyed to the cooling circuit of the turbine system component and/or used for power augmentation when the heat exchanger is employed in the combustion turbine system operating in a simple cycle; andpositioning the damper in a second position to direct hot gas flowing from the first heat transfer stage to the second heat transfer stage, closing the second isolation valve and the first bleed line, and opening the first isolation valve so that steam generated in the second coolant conduit can be directed to the cooling circuit of the turbine system component and/or used for power augmentation and steam generated in the first coolant conduit can be used to drive a steam turbine when the heat exchanger is employed in the combustion turbine system operating in a combined cycle.