Process for passivation of reactive coal char

Details Process for passivation of reactive coal char Process for passivation of reactive coal char

1995-09-08

1998-01-27

Medley, Margaret

Fuel and related compositions

Coal treating process or product thereof

44626, 201 28, 201 29, 201 39, C10L 500, C10B 2118

Patent

active

057117691

ABSTRACT:
A continuous process for treating coal to form stable coal char by passivating the coal and then rehydrating and cooling the product thereof to prevent spontaneous ignition. The process includes the steps of pyrolyzing the coal to vaporize and remove low end volatile materials and to mobilize high end volatile materials and cooling to demobilize the high end volatile materials within the at least partially collapsed micropores of the coal char to pyrolytically passivate the coal char and form a char having about 14-22 wt % high end volatiles. The pyrolytically passivated coal char is then conveyed to a reaction vessel wherein a process gas having about 3%-21% by volume oxygen flows through the reaction vessel to at least partially fluidize the coal char and oxidatively passivate the coal by chemisorption of oxygen. The passivated coal char is then substantially simultaneously rehydrated and cooled to form a stable coal char having about 5-10 wt % moisture.

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