PULVERISED COAL OBTAINING METHOD Russian patent published in 2014 - IPC C21B5/00 B02C21/00 

FIELD: metallurgy.

SUBSTANCE: method involves stages providing the drying gas heated up to the pre-set temperature in a hot gas generator, supply of heated drying gas to a coal mill, injection of run-of-mine coal to the coal mill that pulverises run-of-mine coal to pulverised coal, collection of mixture of drying gas and pulverised coal from the coal mill and supply of the mixture to a filter that separates the dried pulverised coal from the drying gas, collection of dried pulverised coal for further use and supply of drying gas from the filter to a discharge pipeline. After that, the drying gas leaving the filter is collected and some part of the collected drying gas is supplied to a recirculation pipeline for supply of recirculation drying gas to a hot gas generator. The stage that provides the drying gas includes supply of waste gas of a drying furnace at variable speed to the hot gas generator via the waste gas pipeline of the drying furnace; with that, amount of waste gas of the drying furnace, which is used as drying gas, is brought to maximum. Drying gas pressure in an inlet gas branch pipe of the coal mill is controlled by regulation of waste gas flow velocity.

EFFECT: improvement of pulverised coal quality.

15 cl, 1 dwg