Method of capturing sulfur in coal during combustion and gasification
First Claim
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1. A method of combusting solid particulate carbonaceous fuel containing sulfur, comprising the steps of:
- (a) treating said fuel by mixing it with an aqueous solution including a calcium-containing sulfur absorbent at at least ambient temperature to mix said sulfur absorbent with said fuel;
(b) providing a reactor and exposing said treated fuel to a reducing atmosphere in said reactor at a temperature of between about 1500°
F. and about 1800°
F. for converting at least about 20% of the solid carbonaceous material in said fuel to the gaseous state while forming a solid char material containing said sulfur and compounds of calcium; and
(c) providing a combustor and passing said char material from said reactor to said combustor and combusting said char material in said combustor at a temperature of at least about 2100°
F. in the presence of sufficient oxygen to promote the reaction of said sulfur and said compounds of calcium to form calcium sulfate, thereby forming gaseous combustion products substantially free of gaseous sulfur compounds and an ash containing sulfur fixed therein as calcium sulfate.
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Abstract
A method of reducing the amount of gaseous sulfur compounds released during combustion of sulfur-containing fuel, comprising the steps of: (a) preparing a mixture of sulfur containing particulate fuel and a sulfur absorbent, such as calcium oxide, calcium hydroxide, calcium carbonate, lime, limestone, dolomite, or mixtures thereof; (b) exposing the mixture to a reducing atmosphere at a temperature of at least about 1500° F., so as to convert at least a portion of the particulate fuel into a gaseous portion and a solid, char portion; and (c) combusting the char portion, thereby forming an ash containing sulfur fixed therein.
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10 Claims
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1. A method of combusting solid particulate carbonaceous fuel containing sulfur, comprising the steps of:
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(a) treating said fuel by mixing it with an aqueous solution including a calcium-containing sulfur absorbent at at least ambient temperature to mix said sulfur absorbent with said fuel; (b) providing a reactor and exposing said treated fuel to a reducing atmosphere in said reactor at a temperature of between about 1500°
F. and about 1800°
F. for converting at least about 20% of the solid carbonaceous material in said fuel to the gaseous state while forming a solid char material containing said sulfur and compounds of calcium; and(c) providing a combustor and passing said char material from said reactor to said combustor and combusting said char material in said combustor at a temperature of at least about 2100°
F. in the presence of sufficient oxygen to promote the reaction of said sulfur and said compounds of calcium to form calcium sulfate, thereby forming gaseous combustion products substantially free of gaseous sulfur compounds and an ash containing sulfur fixed therein as calcium sulfate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification