METHOD OF CONTROLLING COMBINED CYCLE PLANT PROVIDED WITH GAS TURBINE AND MUST-HEAT RECOVERY BOILER, AND CONTROLLER THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a control method by which an NOX discharge amount discharged from a plant is prevented from exceeding a regulatory value even when an exhaust temperature is low in start-up of the plant, in the combined cycle plant combined with a gas turbine and an exhaust-heat recovery boiler.;SOLUTION: When the combined cycle plant provided with the gas turbine 1 for driving a generator 15 the recovery boiler 3 for gas turbine exhaust, and a denitration equipment 6 built in the boiler is started up, a moving vane angle of a compressor 11 is controlled to bring the NOX discharge amount discharged from the plant into the regulatory value or less until a detected value by an exhaust gas thermometer 24 in an inlet of the denitration equipment reaches to a temperature suitable for denitraion, so as to reduce an intervane passage width, and an exhaust gas amount flowing from the gas turbine into the denitration equipment is reduced thereby to a prescribed amount or less.;COPYRIGHT: (C)2002,JPO