STEEL BOILER USING CAST-IRON FURNACE Russian patent published in 2000 - IPC

FIELD: heating detached dwelling houses. SUBSTANCE: boiler has double-wall furnace, inner and outer casings joined together at foot by means of common frame and provided with covers, flue-communicating pipes, shell for mounting and fixing door with waterwall, water boiling sections mounted in side walls and inclined in opposite directions to form space between heat-transfer surfaces and to ensure their relative displacement. Water boiling section is set on spacer and bolted to furnace made of fire-resistant cast iron. Furnace is of square section which turns into round section; mentioned double walls of furnace are closed with bottom and on top they are covered with straps which have holes for water circulation and for bolting water boiling section of boiler to furnace. EFFECT: improved economic efficiency of boiler. 5 dwg