FIELD: generation of steam; supply of heat for industrial and agricultural objects. SUBSTANCE: boiler has two drums (upper and lower) interconnected by means of convection tube bank; drums are located perpendicularly relative to longitudinal axis of boiler; sectional furnace chamber of boiler is provided with water walls with two rows of windows; front solid headers are connected with front water wall. EFFECT: enhanced efficiency of boiler due to increased heat extraction. 9 cl, 14 dwg
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