WATER TUBE BOILER Russian patent published in 2000 - IPC

FIELD: heating systems. SUBSTANCE: boiler is designed for heating of water used in heat supply systems and for preparation of water for use in different technological processes. Boiler has furnace and convective gas duct made in form of common tube. Part of tube, forming the furnace, is arranged in hollow housing whose space is connected with pumps providing periodical delivery and removal of liquid serving as lining. Tube forming furnace and gas duct can be made, at least on part of its length, in form of screw spiral or in form of sections with shutters and drives on end of each section and with discharge gas temperature pickups. EFFECT: reduced thermal energy losses, both through lining and with discharge combustion products. 3 cl, 7 dwg