Burning cell for solid waste fuel materials

A burning cell for solid waste fuel materials which comprises in combination a vertical lower cylindrical burning chamber for waste fuel, a vertical upper cylindrical burning chamber for fines, a partition separating said chambers, a reduced diameter opening centrally arranged in said partition between said two chambers, a roof on said upper chamber, a reduced diameter outlet opening centrally arranged in said roof, a bottom in said lower chamber, feed means for solid waste fuel material arranged for feeding said waste fuel in the said lower chamber to build up a waste fuel pile on the bottom thereof, a plurality of circumferential arrays of inwardly radially directed tuyeres arranged in the side wall of said lower chamber near the bottom thereof, first air feed means to blow air into said lower chamber through said radially directed tuyeres and against said waste fuel pile, a helical array of downwardly inwardly and sidewardly inclined tuyeres arranged in the cylindrical wall of said upper chamber, second air feed means to blow air into said upper chamber through said tuyeres to produce an outer descending whirlpool of air which reverses direction at said partition to form a central ascending whirlpool of air between the centrally arranged reduced diameter opening of said partition and the centrally arranged reduced diameter opening of said roof, whereby the large particle fuel is totally burned in said pile in the lower chamber, and the partially burned fines are entrained by the air from the tuyeres of said lower chamber and are conveyed upwardly into the said central ascending whirlpool through said upper chamber, to more thoroughly burn said fines while preventing sufficient contact between said fines and the walls of said upper chamber to cause said fines to stick to the walls of said upper chamber.