Feed distribution for low velocity air density separation

Details Feed distribution for low velocity air density separation Feed distribution for low velocity air density separation

B - Operations, Transporting

07

B

B07B 11/02 (2006.01) B07B 4/02 (2006.01) D21B 1/02 (2006.01)

Patent

CA 2280604

Air is drawn upwardly through a vertical air separation chamber with an open bottom. Material to be separated is introduced into the rising stream of air. Material having a smaller ballistic cross-section rises, while heavier material falls through the open bottom. The air stream is controlled to below about 1,500 feet per minute. Tie dispersion of the material is accomplished with a jet of air taken from a plenum connected to an air recirculation system. The air jet is introduced immediately below the material inlet to the chamber. The jet of air breaks up and disperses the material. An air recirculation system includes a fan which draws air out of the top of the air separation chamber by way of a hydrocyclone. The air extracted from the hydrocyclone is reintroduced at the bottom of the air separation chamber from a surrounding plenum.

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