Liquid fuel combustion with porous fiber burner
OwnerPaul W. Garboinventor
Life of this patent
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Abstract
Improved combustion of liquid fuel is achieved with a porous fiber burner by forming a mixture of the vaporized fuel and all of the desired combustion air sufficiently heated to prevent condensation of the vaporized fuel, and introducing the heated mixture into the porous fiber burner to effect flameless combustion on the outer surface of the burner. The resulting surface combustion produces a high proportions of radiant heat and increased thermal efficiency while suppressing the formation of nitrogen oxides and other pollutants in the flue gas. Periodically, fuel gas may be supplied to the same porous fiber burner.
Claims10
The improved combustion of liquid fuel having an end boiling point not more than about 650.degree. F. to achieve high thermal efficiency and low NO.sub.x emission which comprises preheating the combustion air in an amount not more than 15% in excess of the stoichiometric requirement, forming prior to combustion a hot, completely gaseous mixture of said liquid fuel and said amount of preheated combustion air, introducing said hot mixture into a porous fiber burner containing a uniformly distributed, small amount of fine aluminum powder, effecting flameless combustion of said hot mixture on the outer surface of said burner thereby yielding hot flue gas of low NO.sub.x content below about 20 ppm, and passing said hot flue gas in countercurrent heat exchange with said combustion air for the aforesaid preheating thereof.
The process for the improved combustion of liquid fuel having an end boiling point not exceeding about 650.degree. F. by flameless combustion on the outer surface of a porous fiber burner, which comprises initially supplying a mixture of fuel gas and combustion air to said porous fiber burner into which a small amount of fine aluminum powder has been uniformly distributed, effecting flameless combustion of said mixture on the outer surface of said burner containing said aluminum powder, passing the resulting hot flue gas in countercurrent heat exchange with said combustion air to preheat said combustion air to a predetermined high temperature, thereafter replacing said fuel gas by injecting said liquid fuel into said combustion air at said predetermined high temperature to form prior to combustion a completely gaseous mixture in which the amount of said combustion air is not more than 15% in excess of the stoichiometric requirement, supplying said completely gaseous mixture to said burner containing said aluminum powder, effecting flameless combustion of said completely gaseous mixture on the outer surface of said burner containing said aluminum powder thereby yielding hot flue gas of low NO.sub.x content below about 20 ppm, and passing said hot flue gas of low NO.sub.x content in countercurrent heat exchange with said combustion air in said amount of not more than 15% in excess of the stoichiometric requirement.
Dependencies are inferred from the claim text.