Process for purifying flue gas

Details Process for purifying flue gas Process for purifying flue gas

1985-07-23

1986-11-04

Favors, Edward G.

Furnaces

Process

Treating fuel constituent or combustion product

55 72, 110344, 110215, 110216, 423103, 423240, 423243, F23J 1100, F23J 1500

Patent

active

046204920

ABSTRACT:
A process for the purification of flue gas generated during the combustion of waste materials has a first embodiment wherein soluble heavy metals are precipitated and recovered in a compact form and wherein the soluble heavy metal-free extraction residue is returned to the combustion system where noxious organic substances are pyrolyzed. In another embodiment, substantially all of the heavy metals from the flue gas are collected in a single solid residue, which residue may be thermally treated to recover mercury and the treated residues subsequently returned to the combustion system wherein noxious organic substances are pyrolyzed or combined in a hazardous waste stabilizing substance. In yet another embodiment of the process, heavy metals present in an acidic condensate solution from a condensation/scrubbing step are precipitated and the precipitated heavy metals are thermally treated, together with the flue ash, to remove mercury, after which the remaining solids may be returned to the combustion system to pyrolyze noxious organic substances contained therein or may be combined with a hazardous waste stabilization substance.

REFERENCES:
patent: 3789109 (1974-01-01), Lyon et al.
patent: 3791812 (1974-02-01), Frank et al.
patent: 3969482 (1976-06-01), Teller
patent: 4013455 (1977-03-01), Kleeberg et al.
patent: 4124462 (1978-11-01), Reinhardt et al.
patent: 4297332 (1981-10-01), Tatani et al.
patent: 4477373 (1984-10-01), Grantham et al.
Abfallwirtschaft an der TU Berlin (Waste Treatment Policies at the Technical University of Berlin), vol. 7, pp. 1-41; 7-81.

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