Wood and other solid register burner

Claim 1

A burner having: a burning chamber defined by a substantially cylindrical wall provided with a heat resistant inner lining, the longitudinal axis of said chamber being generally horizontal, an outer wall encircling the wall to form an annular distributing chamber about the burning chamber, means for closing one end of the substantially cylindrical wall, means adjacent said one end for introducing a material to be burnt, tangentially into the chamber, means at said one end to ignite the material to have it burn as it moves spirally through the chamber away from the one end, means for supplying air under pressure through said distributing chamber into the burning chamber to support the combustion, a set of air inlets provided in the bottom portion of the burning chamber and connected to the air supplying means both to support combustion of the material to be burnt in the burning chamber and to fluidize the material being burnt with the pressurized air supplied, said air inlets comprising a plurality of narrow slots arranged in longitudinal columns and circumferential rows to provide a regular array extending over most of the length of the chamber in the bottom third thereof, said slots being formed by gaps left between a regular array of firebricks mounted in spaced apart relationship in an opening formed in both the walls of the chamber and the inner lining, said regular array of firebricks being arranged in longitudinal columns and circumferential rows, supported in the opening by a grid, so that the inner surfaces of said firebricks are generally flush with the inner surface of the chamber lining, one longitudinal column of firebrick supported by the grid being higher than the others and extending inwardly into the burning chamber to disturb at least partially the spiral movement of the material being burnt.