GB247858A - Improvements in or relating to powdered fuel furnaces - Google Patents

Abstract

247,858. Hold, C. Sept. 19, 1925. Pulverulent - fuel furnaces have the combustion chamber a formed at its top with a dome-shaped vault on one side of which joins the wall k of an upwardlydirected flue b, the lower part c of the chamber being rounded in horizontal cross-section and merging smoothly into the vault. Separately regulable secondary air supply conduits r, s open at various angles into the chamber a so that the flame from burners f, g may be given any desired direction. A fireproof throat arch l, maintained at ignition temperature, is separated from the arch of the wall k by an air space or insulation m. The walls d, e of the lower part c may be straight or slightly curved in vertical section and these walls together with the dome are surrounded by a jacket h through which cooling air passes to a post i whence it is led by a pipe system to the primary and secondary air conduits. The secondary air inlets r, s are so arranged that the flame may be directed upon any part of the furnace wall for the melting of clinker, and concentrated jets of flame for melting large cakes of clinker may be obtained by opening several secondary air inlets whose axes are directed towards the desired point. The length of the flame path may also be adjusted to suit various grades of fuel. The clinker falls into a water-cooled ash-pit o covered by a cap p to minimize the formation of steam; an orifice q in this cap serves as a further secondary air inlet. Specification 233,214 is referred to.