BARREL BOILER Russian patent published in 1998 - IPC

FIELD: thermal engineering. SUBSTANCE: this once-through barrel boiler with built-in economizer has internal furnace and annular headers inter connected through heat-transfer tubes and gas ducts in the form of annular channels formed by gas conduits. Barrel boiler may run as water-heating or steam-generating boiler and may be found useful for industrial and agricultural entities; it can be mounted horizontally, vertically, or in inclined position; its efficiency is as high as 93%. EFFECT: enlarged functional capabilities, improved efficiency. 13 cl, 20 dwg