| 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.
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