METHOD OF MAKING PULVERISED COAL Russian patent published in 2013 - IPC C10B57/10 F26B21/10 B02C23/34 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises heating of drying gas in hot gas generator, feeding heated gas into coal mill, feeding lean coal into mill to convert into powdered coal, collecting the mix of drying gas and powdered coal to be fed to filter for separation of dried powdered coal, collecting dried powdered coal to feed a portion of drying gas from filter in circulation line to return said portion of drying gas into hot gas generator. Note here that said method includes starting cycle whereat heated gas is fed via mill without feed of lean coal and grinding cycle whereat heated gas is forced via mill to feed lean coal therein. Temperature at drying gas mix outlet and that of powdered coal are controlled by injecting water into heated gas before its feed into mill. In starting cycle, said drying gas is heated to temperature higher than that of the first temperature threshold to inject a portion of water. Note here that to obtain outlet temperature higher than said first threshold water volume is calculated to decreased heated gas temperature. At grinding cycle start, injected water volume is decreased to control and compensate outlet temperature drip.

EFFECT: efficient process.

12 cl, 1 dwg