HEATING BOILER Russian patent published in 1996 - IPC

FIELD: thermal engineering; ;ow-capacity boiler houses. SUBSTANCE: additional tube bundle is placed under supports of grate bars. Transverse tubes of bundle are welded to grate-bar supports. These tubes pass circulating water that cools down grate-bar supports and grate thereby eliminating overheating of grate-bar supports and grate. Water circulating in transverse tubes, in bottom headers 6, heats to high temperature which makes it possible to more efficiency utilize heat and to save fuel. Roof waterwall and boiler waterwalls are built up of three sections. Provision is made for longitudinal flow of water over waterwall tubes Stagnation zones are reduced. EFFECT: improved boiler efficiency and reliability. 9 dwg