US 4,375,976 AGranted

Method and apparatus for recovering particulate matter from gas stream

OwnerGeorge R. Potterinventor

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Abstract

Filter apparatus and a method for removing dry combustible particulate material from a stream of gas in two steps of separation, utilizing a primary separator to remove the majority of the material from said stream of gas and a secondary filter apparatus which includes water sprays and a wetted filter pad to remove additional material. Portions of the filter pad are sequentially backwashed at periodic intervals, and the particulate material washed from the filter pad is thereafter introduced into the stream of gas being cleaned, permitting collection of all removed particulate material from a single collection point associated with the primary separation apparatus. The material washed from the filter pad of the secondary apparatus is introduced into the stream of gas to be cleaned in the form of a slurry, the moisture from the slurry thereby reducing the likelihood of explosion of the particulate matter within the stream of gas.

Claims10

Dependent claims

A method of removing and collecting combustible particulate matter, in a substantially dry form, from a stream of gas containing said particulate matter, comprising:

(a) passing said stream of gas through a dry primary separator;
(b) collecting a majority of said particulate matter from said stream of gas in said primary separator;
(c) thereafter conducting said stream of gas into a secondary separator;
(d) collecting additional particulate matter from said stream of gas in said secondary separator;
(e) washing said additional particulate matter from said secondary separator with a liquid and thereby forming a fluid mixture of said additional particulate matter and said liquid;
(f) removing said fluid mixture from said secondary separator;
(g) separating a minor portion of said liquid and a major portion of said additional particulate matter from said fluid mixture and forming a slurry thereof;
(h) introducing said slurry into said stream of gas at a location upstream from entry of said stream of gas into said primary separator and thereby transferring liquid from said slurry to other particulate matter contained in said stream of gas;
and
(i) thereafter collecting said additional particulate matter of said slurry and said other particulate matter from said stream of gas.

7 more elements

Apparatus for removing combustible particulate matter in a substantially dry form from a stream of gas, comprising:

(a) dry primary separator means for removing a majority of said particulate matter from said stream of gas;
(b) infeed conduit means for directing said stream of gas into said primary separator means;
(c) secondary separator means for removing additional particulate matter from said stream of gas and having particulate collecting surfaces for collecting said additional particulate matter;
(d) washing means in said secondary separator means for washing said additional particulate matter from the collecting surfaces of said secondary separator means with a liquid;
(e) drain means in said secondary separator means for collecting said additional particulate matter and said liquid as a fluid mixture;
(f) means connected to said drain means for separating a minor portion of said liquid and a major portion of said additional particulate matter from said fluid mixture and forming a slurry thereof;
(g) means for delivering said slurry from said means for separating to said infeed conduit means;
and
(h) means located in said infeed conduit means for introducing said slurry into said infeed conduit means.

6 more elements

Dependencies are inferred from the claim text.