System and method for heating fuel in a combined cycle gas turbine

摘要

A system 10 for heating fuel in a combined cycle gas turbine 12 includes a fuel heat exchanger 50 downstream from a turbine outlet 36, and the fuel heat exchanger 50 has an exhaust gas inlet 52, an exhaust gas outlet 54, a fuel inlet 56, and a fuel outlet 58. A first exhaust gas plenum 70 has a first exhaust gas inlet connection 72 between the turbine outlet 36 and a heat exchanger 50 and a first exhaust gas outlet connection 74 upstream from the exhaust gas inlet 52. A second exhaust gas plenum 80 has a second exhaust gas inlet connection 82 downstream from at least a portion of the heat exchanger 50 and a second exhaust gas outlet connection 84 upstream from the exhaust gas inlet 52.