FIELD: power engineering. SUBSTANCE: method comprises heating water in the economizer of the boiler when afterburning degree is higher than optimal one for a given parameters of steam. The flow rate of heated water is equal to its optimal flow rate when the afterburning degree is an optimal. The remainder portion of water is heated in air cooler up to a temperature that is not as low as the boiling temperature. The flows are then mixed in the drum of the boiler. EFFECT: simplified method. 2 cl, 2 dwg
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