FIELD: boiler plants. SUBSTANCE: water is preheated at constant excessive pressure equal to hydrostatic pressure to temperature exceeding boiling point at barometric pressure followed by expansion at barometric pressure; heat obtained due to expansion of water of flash steam is used for preheating part of initial water which is constant relative to total flow of water being heated at any change in it; amount of heat supplied to water is adjusted through maintaining constant temperature drop of part of water fed for heating at recovery of heat of steam flash. EFFECT: enhanced efficiency. 1 dwg
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