Conversion of coal by drying, pyrolysis and gasification - using recycled coke as heat carrier

摘要

Conversion of particulate coal (or other solid fuel) to liq. and gaseous products is carried out by (a) drying the coal in contact with a heat carrier comprising recycled particulate coke; (b) subjecting the coal/coke mixt. ot pyrolysis in 2 stages and recycling part of the coke to step (a); (c) heating the rest of the coke to 800-1500 deg.C. by contact with hot gaes and/or by partial combustion; and (d) steam-gasifying the hot coke and recycling residual coke to the 1st pyrolysis stage. The process is stated to have a thermal efficiency of 84-88% and to give high yields of high-quality products (pyrolysis gas, liq. hydrocarbons and water gas).