Burner for combusting oxygen-coal mixture

Claim 1

A burner (10) for combusting a mixture of powdered hydrocarbon and a combustion supporting medium, to form a stream of a produced gas which burner comprises; an elongated burner body (21) defining a mixing chamber (26) therein, means communicating said mixing compartment with discrete sources of the powdered hydrocarbon (12) and the combustion supporting medium (11), a peripheral lip (23) at one end of said elongated body (21) defining a discharge nozzle (28) which communicates with said mixing compartment (26), and through which lip (23) said stream of produced bgas issues, said elongated burner body (21) including a face (24) disposed adjacent to the peripheral lip (23), a manifold (37) disposed contiguous with said burner body (21), being spaced radially outward of said discharge nozzle lip (23) and communicated with a source of a pressurized fluid (38), a plurality of constricted ports (43) formed in said manifold (37), being spaced radially apart, adjacent to said face, and aligned toward said peripheral lip (23) to direct a plurality of jets of said fluid from the manifold (37) toward the said peripheral lip (23), whereby to form a dynamic, fluid barrier which extends transversely of the burner face (24) to avoid the deposition of ash particles on the said face.