Process of removing pollutants from exhaust gases

Details Process of removing pollutants from exhaust gases Process of removing pollutants from exhaust gases

1986-02-26

1987-06-02

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423210, 423240, 423242, B01J 800, C01B 1700

Patent

active

046702377

ABSTRACT:
In a process of removing pollutants consisting substantially of sulfur oxides from exhaust gases at temperatures below 150.degree. C. by means of a sorbent which contains calcium carbonate, calcium oxide and/or calcium hydroxide and which is included in a circulating fluidized bed system consisting of a fluidized bed reactor, a separator and a return line, a complete utilization of the sorbent is achieved in that a partial stream of laden sorbent is withdrawn from the circulating fluidized bed and is subjected at a temperature of 600.degree. to 1200.degree. C. to an oxidizing treatment, a major part of the sorbent that has been subjected to an oxidizing treatment is recycled to the circulating fluidized bed, and a partial stream which contains the sorbent mainly in the form of calcium sulfate is removed from the process. Fresh sorbent is supplied to the circulating fluidized bed and/or to the stage for the oxidizing treatment at the rate at which said partial stream is removed from the process.

REFERENCES:
patent: 4442079 (1984-04-01), Donelly et al.
patent: 4454100 (1984-06-01), Faatz
patent: 4495165 (1985-01-01), Nguyen

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