Method of treating flue gases and combustion residues

Details Method of treating flue gases and combustion residues Method of treating flue gases and combustion residues

1988-08-17

1989-08-22

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

423242, C01B 700, C01B 1700

Patent

active

048594407

ABSTRACT:
The alkalinity of the solids, slag and ash, which occur in a combustion plant such as an incinerator is utilized for the flue gas scrubber, while at the same time the storability and the alkaline flue gas washing stage are improved. For this purpose, the scrubbing liquor is removed from the tank of a flue gas scrubber for SO.sub.2, so that it can be used for the separate scrubbing of slag and ash in, for example, stirrer vessels. Subsequently, the slag is separated in a sieve according to particle size, and the fine portion, together with the ash, is supplied to a dewatering stage, from which they pass to a stirrer vessel, in order to be re-washed there with scrubbing liquor from tank emanating from a flue gas scrubber for HCl. In a subsequent washing stage, the solids are freed of chlorides. The scrubbing liquor from the dewatering stage is returned to the tank, while the scrubbing liquor from the settling tank is returned to another tank. To separate mercury and the other heavy metals, additional stages are provided.

REFERENCES:
patent: 4002724 (1977-01-01), Mokie
patent: 4138231 (1979-02-01), Hedenas et al.
patent: 4164547 (1979-08-01), Simko
patent: 4228139 (1980-10-01), Johnson
patent: 4369167 (1983-01-01), Weir

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