PROCESS OF PRODUCING WATER-COAL FUEL FOR COMBUSTION IN GAS-MAZUT BOILER Russian patent published in 2005 - IPC

FIELD: alternate fuels.

SUBSTANCE: invention aims at transferring gas-mazut boilers consuming natural gas or mazut to combustion of water-coal fuel prepared from fuel. Process of invention comprises gravitational concentration of coal, crushing and wet grinding of coal to average surface area of particles belonging to disperse phase not higher than 3 μm. Preliminarily, moisture content, ash level, chemical analysis of ashes, slag-forming temperature of ashes, and combustion heat of water-coal fuel are determined from condition (i) that such amount of combustion products is formed in boiler, which provides achievement of a combustion products' velocity in furnace space of boiler exceeding critical velocity, at which ash particles precipitate, and (ii) that temperature of the water-coal fuel combustion products in boiler furnace outlet is not above slag-forming temperature of ashes. Gravitational concentration of coal is performed before grinding thereof and moisture content, ash level, chemical analysis of ashes, slag-forming temperature of ashes, and combustion heat of water-coal fuel are controlled according to preliminarily made computations.

EFFECT: simplified and reduced in price fuel production process, eliminated precipitation of ashes in furnace space of boiler, and lack of elevated pollution of heating surfaces.

2 cl, 3 ex