FIELD: stationary and mobile power plants. SUBSTANCE: flowrate of combustion products and their temperature are maintained constant upstream of gas turbine by controlling air and fuel supply to auxiliary combustion chamber mounted in flue duct between high-pressure part of steam generator and gas turbine as well as by controlling operating conditions of main combustion chamber between full load and no load by reducing flowrate of fuel or flowrate of fuel and air and due to additional injection of water and/or steam in one of both combustion chambers. EFFECT: improved maneuverability of plant, improved economic efficiency and environmental friendliness due to operating gas-turbine plant under rated conditions at any varying heat supply in the form of steam (hot water) and electric energy delivery to users. 18 cl, 1 dwg
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