SYSTEM AND METHOD FOR GENERATING STEAM DURING GAS TURBINE LOW-LOAD CONDITIONS

摘要

A system and method for generating steam during gas turbine low-load operating conditions is disclosed herein. The system includes a gas turbine having a compressor, a combustor, a turbine and at least one bleed air extraction port in fluid communication with the compressor, a compressor discharge casing or the combustor. The system further includes a premix duct burner downstream from the turbine and upstream from a heat recovery steam generator of the gas turbine. During operation, the premix duct burner increases temperature of combustion gases flowing from the turbine and into the heat recovery steam generator and compressed air flows out of the bleed air extraction port so as to reduce pressure within the compressor, the compressor discharge casing or the combustor during low-load gas turbine operating conditions.