METHOD OF REDUCTION OF SULFUR DIOXIDE EMISSIONS DURING BURNING OF COALS Russian patent published in 2006 - IPC C10L5/00 C10L9/10 F23K1/02 

FIELD: treatment of coal for reduction of sulfur dioxide emissions during burning of coal.

SUBSTANCE: coal at high content of sulfur is placed in low-pressure medium for cracking of part of coal by extraction of atmospheric fluids entrapped in coal. Then cracked coal is brought in contact with aqueous composition of colloidal silicon oxide oversaturated with calcium carbonate and larger part of aqueous composition is brought out of contact with coal, after which coal is acted on by high pressure in carbon dioxide medium during period of time sufficient for penetration of calcium carbide into cracks in coal. Description is also given for coal cracked in vacuum which contains about 0.5 wt-% of sulfur and additionally contains calcium carbonate deposited in cracks in coal in the amount sufficient for obtaining Ca:S molar ratio equal to at least 0.5. Specification contains also description of obtaining energy in the course of burning coal at high content of sulfur at simultaneous reduction of sulfur dioxide in emissions. Specification contains also description of increase of calcium sulfate obtained in the course of burning coal at high content of sulfur and aqueous composition used for treatment of such coal. Specification contains also description of preparation of aqueous composition for treatment of coal at high content of sulfur in combustion products. Description is also given for device for treatment of coal at pressure.

EFFECT: considerable reduction of sulfur dioxide and other toxic gases formed during burning of coal.

25 cl, 8 dwg, 3 ex