FIELD: power industry.
SUBSTANCE: invention refers to power industry and can be applied in operation of once-through steam generator functioning at variable pressure and stem temperature over 650°C, with reduced minimum pressure flow load of pressure-flow steam generator, where the steam generator is installed in the plant work medium circuit, and steam generator economiser includes at least one high-pressure heater and/or heat transfer system for heating medium, so that at least one high-pressure heater and/or heat transfer system for heating medium is installed upstream in the work medium flow in the circuit; when fractional load setpoint (LT) is elevated, heat absorption of work medium in at least one high-pressure heater and/or heat transfer system is reduced so that the temperature of steam and water work medium at economiser outlet is lower than boiling temperature against at the respective economiser outlet by a given temperature difference (TD).
EFFECT: enhanced operation efficiency.
19 cl, 3 dwg
