B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
183/82
B01D 46/34 (2006.01) B01D 46/30 (2006.01)
Patent
CA 1127561
ABSTRACT A shell and two perforated cylindrical walls are radially spaced about a common vertical axis so as to define three coaxial spaces. A gas to be purified of suspended particles is admitted to the annular first space between the shell and a filter bed of granular material in the second space between the two perforated walls, and a purified gas is withdrawn from the third space. To clean the filter bed, granular material is conveyed from the lowermost portion of the second space through a conduit to a separating device above the topmost portion of the filter bed by a stream of conveying gas, and the gas entrains most of the particles from the granular material while the latter returns to the second space by gravity. The particle-laden conveying gas is introduced tangen- tially into the top portion of the annular first space where it is mixed with a scavenging gas passed through the filter bed from the third to the first space. The gas mixture with the particles suspended therein descends in a spiral path through the first space, the particles are precipitated as in a cyclone, and gas and particles are withdrawn separately from the bottom of the first space.
342477
Fetherstonhaugh & Co.
Gimag Aktiengesellschaft
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