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US 4,397,742 AGranted
Composition and method combining fluidized bed residue with scrubber sludge
OwnerL. John Minnickinventor
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OwnerL. John Minnickinventor
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A method of treating scrubber sludge removed from a gas scrubbing apparatus of the type adapted to reduce SO.sub.x content in the treated gas, is provided. The method comprises collecting the spent residue from a fluidized combustion bed of the type wherein lime or calcium carbonate particles are suspended in a fluidized medium and wherein a carbonaceous fuel is ignited proximate said fluidized medium to absorb therein substantial amounts of SO.sub.x which is generated upon ignition of said carbonaceous fuel. The fluidized bed combustion residue is then subjected to a separating treatment wherein a slurry of residue is mechanically agitated. The supernatant liquor from the slurry is separated therefrom, leaving a precipitate material which latter material is mixed with sludge. The novel composition comprises a combination of scrubber sludge and fluidized bed combustion residue precipitate, as above mentioned.
In a method of treating sludge removed from a gas scrubbing apparatus of the type adapted to reduce SO.sub.x content in the treated gas, wherein x is 2 or 3, the improvement which comprises:
Composition comprising a mixture of (a) scrubber sludge removed from a gas scrubbing apparatus of the type adapted to reduce the SO.sub.x content of the waste gas treated therein, wherein x is 2 or 3, and (b) a precipitate material containing calcium sulfate anhydrite formed by separating the precipitate from an agitated aqueous slurry of fluidized bed combustion residue of the type wherein lime or limestone particles are suspended in a fluidized medium, and wherein carbonaceous fuel is subjected to combustion in a combustion bed operated at a temperature below about 1600.degree. F. proximate said fluidized medium to capture therein substantial amount of the SO.sub.x which is generated upon combustion of the carbonaceous fuel, thereby producing said fluidized bed combustion residue comprising mostly crystalline compounds in contrast to amorphous compounds produced in conventional high temperature combustion processes;
In a method of treating sludge removed from a gas scrubbing apparatus of the type adapted to reduce SO.sub.x content in the treated gas, wherein x is 2 or 3, the improvement which comprises:
Composition comprising the combination of scrubber sludge removed from a gas scrubbing apparatus of the type adapted to reduce the SO.sub.x content of the waste gas treated therein, wherein x is 2 or 3, and a precipitate material containing calcium sulfate anhydrate, said precipitate material being formed by separating the precipitate from an agitated aqueous slurry of fluidized bed combustion residue of the type wherein lime or limestone particles are suspended in a fluidized medium and wherein coal is subjected to combustion in a combustion bed operated at a temperature below about 1600.degree. F. proximate said fluidized medium to capture therein a substantial amount of the SO.sub.x which is generated upon combustion of the coal, thereby producing said fluidized bed combustion residue comprising mostly crystalline compounds in contrast to amorphous compounds produced in conventional high temperature combustion processes;
Dependencies are inferred from the claim text.