Patent ID: 6336449
Filing Date: 2002-01-08
Classification: F23B,F23G,F23L,F23M,F23N,F24B,Y02A,Y02E

Abstract:
A burner system for burning pellets or granules of solid biomass heating fuel, comprising an air tight combustion chamber having an exhaust outlet in an upper region thereof and a burner means in the bottom thereof for converting the solid fuel to fuel gases and ash in the presence of a limited air supply, said burner means comprising upright co-axial inner and outer cylindrical walls providing a central gasification/combustion chamber surrounded by an annular combustion air manifold, said annular manifold being closed at the top and bottom and having an air inlet in the outer wall and a plurality of spaced apertures in the inner cylindrical wall arranged in at least one spiral path extending up the wall providing air inlets from the annular combustion air manifold to the gasification/combustion chamber, a grate at the bottom of the gasification/combustion chamber for holding solid fuel while allowing ash to pass through, an air tight ash-receiving chamber below the gasification/combustion chamber and fan means adapted to provide a negative pressure in the gasification/combustion chamber to thereby draw combustion air into and upwardly through the chamber with a swirling motion, whereby solid fuel fed to the grate at the bottom of the gasification/combustion chamber is pyrolyzed in the presence of a limited air supply to form combustion gases which are drawn upwardly through the gasification/combustion chamber while contacting heated combustion air entering through said spaced air inlets.