Process for pulverizing coal to ultrafine size

Details Process for pulverizing coal to ultrafine size Process for pulverizing coal to ultrafine size

B - Operations, Transporting

02

C

241/138, 48/24

B02C 21/00 (2006.01)

Patent

CA 1044676

ABSTRACT OF THE DISCLOSURE A process for pulverizing coal to ultrafine size of a few microns, comprising conveying the coal through successive pulverizers with an inert gas, separating the ultrafine coal from the inert gas, cooling and recyling the inert gas and producing make-up inert gas by water scrubbing and alkaline or monoethanolamine scrubbing boiler flue gases to remove particulate, carbon dioxide, thereby leaving essentially nitrogen inert gas. Control of the final ultrafine particle size is achieved by regulation of the flow of conveying gas through the final pulverizer. Reject material streams are taken from the pulverizers to improve the quality of the product pulverized coal, which subject streams are burned in a furnace so as to recover their heat value.

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