FIELD: steam boilers. SUBSTANCE: drum- separator includes separating devices with cyclones located inside drum. Cyclones have trays whose lower part is made in form of box at height more than 100 mm; edge of box located at distance of no less than 50 mm from cyclone; walls of box are inclined towards horizontal axis at angle of 30 to 90 deg; its lower portion of provided with blow line. EFFECT: enhanced reliability of heating surfaces due to reduced scale on inner surfaces of water-wall tubes; enhanced economical efficiency due to reduced losses at blowing. 1 dwg
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