Filter apparatus and method for collecting fly ash and fine dust

Details Filter apparatus and method for collecting fly ash and fine dust Filter apparatus and method for collecting fly ash and fine dust

1981-08-20

1983-02-22

Nozick, Bernard

Gas separation

Means within gas stream for conducting concentrate to collector

55131, 55155, 55126, 55479, B03C 300

Patent

active

043746527

ABSTRACT:
Fly ash and fine dust in a gas stream from a coal combustor, for example, are efficiently collected in a 2-stage, tubular, granular bed filter. The stages of the filter are arranged one above the other so that the granules may move from the upper stage to the lower stage under the influence of gravity. Larger particulate in the gas stream is first collected by the lower stage, and then the remaining particulate is electrically charged and collected by the upper stage. Both stages are electrified sufficiently to rigidify the granular beds and adhere the particulate to the granules, so that the granules and the collected particulate move downwardly through the filters as a plug. Granules that exit from the lower stage are cleaned and returned to the upper stage. Non-porous granules may be used to prevent fine particulate from becoming embedded in the granules.

REFERENCES:
patent: 1570869 (1926-01-01), Thompson et al.
patent: 3926587 (1975-12-01), Squires
patent: 4004350 (1977-01-01), Squires
patent: 4126435 (1978-11-01), Reese
patent: 4144359 (1979-03-01), Zahedi et al.
patent: 4149858 (1979-04-01), Naack et al.
patent: 4154585 (1979-05-01), Melcher
patent: 4248612 (1981-02-01), Wakabayashi et al.
patent: 4255166 (1981-03-01), Gernand et al.
patent: 4308036 (1981-12-01), Zahedi et al.

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