INTAKE AIR HEATING SYSTEM OF COMBINED CYCLE PLANT

摘要

A gas turbine 2 is driven by a combustion gas produced when BFG compressed by a gas compressor 5 and air compressed by a compressor 1 are burned in a combustor 7. Steam is generated from a waste heat boiler 8 by utilization of heat of an exhaust gas from the gas turbine 2, and a steam turbine 4 is driven by this steam. An electric generator 3 generates electricity upon driving of the turbines 2 and 4. A condensing heat exchanger 20 is disposed in an air intake duct 6, and part of steam from the waste heat boiler 8 is flowed through the heat exchanger 20 to heat intake air. The amount of steam flowed through the heat exchanger 20 is adjusted by the adjustment of the degree of opening of a steam control valve 22 by a control device 40. By so doing, the ignition performance of the gas turbine in a BFG-fired gas turbine combined cycle plant is enhanced even in an extremely cold district.