Irreversible drying of carbonaceous fuels

Details Irreversible drying of carbonaceous fuels Irreversible drying of carbonaceous fuels

F - Mech Eng,Light,Heat,Weapons

26

B

F26B 3/04 (2006.01) C10F 5/00 (2006.01) C10L 9/08 (2006.01)

Patent

CA 2136662

The invention disclosed relates to a method for drying low-quality solid carbonaceous fuels such as lignite and sub- bituminous coal to reduce the moisture content substantially to zero, and to minimize re-adsorption of moisture during storage and transporation. The method involves drying the solid fuel in a mildly reducing atmosphere at a temperature in the range of 150 to 300°C, preferably 200 to 210°C. The mildly reducing atmosphere may be provided by a gaseous lower-alkane e.g. propane and methane. In some cases, the coal may beneficiated by agglomeration with small amounts of oil.

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