AIR HEATER Russian patent published in 2008 - IPC C21B9/00 F24H3/00 

FIELD: metallurgy, namely constructions of air heaters of blast furnaces.

SUBSTANCE: apparatus includes casing with lining; adapter; roof with pre-combustion chamber coaxially arranged in its upper portion and having jacket and lining separately rested upon casing; ducts for passing air and gas are formed in lateral vertical wall of pre-combustion chamber lining and they are communicated with inner collectors and unions for supplying gas and air. Ducts of lower collector are arranged in its upper portion and they are directed upwards from horizontal plane by inclination angle 15 - 30°. Ducts of upper collector are arranged in its lower portion and they are directed downwards from horizontal plane by inclination angle 15 - 30°. Projections of axes of all ducts on horizontal plane form angle 15 - 45° relative to projections on horizontal plane of radiuses of pre-combustion chambers passing through centers of outlet cross sections of said ducts.

EFFECT: lowered operational expenses, improved quality of gas burning.

2 dwg