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A coal fired power plant includes a coal gasification zone where coal is gasified in the presence of an oxidant-lean atmosphere under partial coal gasifying conditions to produce a carbonaceous char and a crude gas stream, an acid separating zone where sulfur-containing compounds are separated from

A coal fired power plant includes a coal gasification zone where coal is gasified in the presence of an oxidant-lean atmosphere under partial coal gasifying conditions to produce a carbonaceous char and a crude gas stream, an acid separating zone where sulfur-containing compounds are separated from the crude gas stream to produce a combustible gas stream, and a converting zone where the sulfur-containing compounds are converted to elemental sulfur. The combustible gas stream and the carbonaceous char are fed into a boiler which drives a generator to produce electricity; portions of the carbonaceous char product and the combustible gas stream are diverted into a gypsum desulfurization zone. SO2-containing flue gas from the boiler is fed into a flue gas desulfurization zone. There, the SO2-containing flue gas is contacted with lime and limestone to produce gypsum. The gypsum is fed to the gypsum desulfurization zone where it is heated with the diverted carbonaceous char under reducing conditions utilizing the diverted combustible gas stream to provide energy to produce a SO2-containing gas stream. The SO2-containing gas stream is recycled back to the coal gasification zone to provide at least a portion of the oxidant-lean atmosphere air used in the coal gasification zone.

대표청구항 ▼

A coal fired power plant comprising: (a) coal gasification means for heating coal in the presence of an oxidant-lean atmosphere under partial coal-gasifying conditions to produce a carbonaceous char and a crude gas stream; (b) means for separating sulfur-containing compounds from the crude gas strea

A coal fired power plant comprising: (a) coal gasification means for heating coal in the presence of an oxidant-lean atmosphere under partial coal-gasifying conditions to produce a carbonaceous char and a crude gas stream; (b) means for separating sulfur-containing compounds from the crude gas stream to produce a combustible gas stream and a sulfur compound-containing stream; (c) means for converting the sulfur compound containing stream into elemental sulfur; (d) energy-conversion means for burning a portion of the combustible gas stream and a portion of the carbonaceous char to produce electricity and SO2-containing flue gas; (e) flue gas desulfurization means for contacting the SO2-containing flue gas with lime and limestone to convert sulfur compounds in the flue gas to gypsum; (f) gypsum desulfurization means for heating the gypsum and the remaining portion of carbonaceous char under reducing conditions utilizing burning of the remaining portion of the combustible gas stream to provide energy to produce a SO2-containing gas stream and a sintered usable aggregate; and (g) means for recycling the SO2-containing gas stream from step (f) to the coal gasification means.