Bio-mass suspension burner

Claim 1

A burner for a combination mixture of particles of solid bio-mass fuel and air comprising: means for providing a primary air stream; means for entraining said solid fuel particles in said primary air stream; a generally cylindrical, elongate combustor means having a first end and a second end; means for injecting said primary air stream and entrained fuel particles through said first end of said elongate combustor means, said combustor means having an exit at the second end thereof; means for providing a secondary air stream and means for injecting said secondary air stream through said first end of said combustor means in surrounding relation to said primary air stream and entrained solid fuel particles; said injecting means for said primary and said secondary air streams including diffuser means to impart a swirl to the air and solid fuel particles entering said combustor means; means for providing a tertiary air stream and means for injecting said tertiary air stream into said combustor means at a plurality of locations along the length thereof; and means for providing a quartiary air stream and means at the exit of said combustor means for injecting said quartiary air stream outwardly of said combustor means and into the combustion mixture leaving said combustor means through said exit.

Claim 9

A method of burning a combination mixture of solid particulate bio-mass fuel and air comprising the steps of: providing a generally cylindrical elongate combustion chamber; introducing a primary air stream through a first end of said chamber and imparting a swirl thereto, said primary air stream having entrained therein solid particulate fuel; introducing through said first end of said combustion chamber a secondary air stream in surrounding relationship to said primary air stream and imparting a swirl to said secondary air stream; introducing a tertiary air stream at a plurality of locations along the length of said chamber; introucing a preheated quartiary air stream at the second end of said combustion chamber into the combustion mixture leaving said chamber, said quartiary air stream being directed outwardly of said chamber; and the total amount of air being introduced by said primary, secondary, tertiary and quartiary air streams being only slightly in excess of that amount of air required for complete combustion of said particulate fuel, the amount of said primary, secondary and tertiary air being less than the stoichiometric amount of air required for such complete combustion within said combustion chamber and wherein combustion is completed outwardly of said combustion chamber by the introduction of said quartiary air stream.

Claim 10

A method of burning a combination mixture of solid particulate bio-mass fuel and air comprising the steps of: providing a generally cylindrical elongate combustion chamber; introducing a primary air stream through a first end of said chamber and imparting a swirl thereto, said primary air stream having entrained therein solid particulate fuel; introducing through said first end of said combustion chamber a secondary air stream in surrounding relationship to said primary air stream and imparting a swirl to said secondary air stream; introducing a tertiary air stream at a plurality of locations along the length of said chamber; introucing a preheated quartiary air stream at the second end of said combustion chamber into the combustion mixture leaving said chamber, said quartiary air stream being directed outwardly of said chamber; and the total amount of air being introduced by said primary, secondary, tertiary and quartiary air streams being only slightly in excess of that amount of air required for complete combustion of said particulate fuel, the amount of said primary, secondary and tertiary air being less than the stoichiometric amount of air required for such complete combustion within said combustion chamber and wherein combustion is completed outwardly of said combustion chamber by the introduction of said quartiary air stream.