METHOD OF BURNING COAL (VERSIONS), APPARATUS FOR BURNING COAL AND METHOD OF REDUCING AMOUNT OF SULPHUR AND MERCURY RELEASED WHEN BURNING COAL (VERSIONS) Russian patent published in 2013 - IPC F23B90/00 F23J15/00 C10L10/00 

FIELD: chemistry.

SUBSTANCE: method of burning coal with reduction of the amount of mercury emitted into the atmosphere is characterised by adding to the coal a liquid sorbing composition which contains calcium bromide, and a solid composition which contains aluminosilicate material and at least one powder which contains calcium, selected from a group comprising portland cement, cement dust, limestone dust, calcium oxide, calcium hydroxide and calcium carbonate, feeding the coal into a coal-burning furnace, burning the coal containing a sorbent in the furnace to form ash and gaseous combustion products, measuring the level of content of mercury in the gaseous combustion products and controlling the amount of the sorbing composition added to the coal depending on the measured mercury content. Aqueous calcium bromide is added to the coal by spraying. The liquid sorbing composition consists of 20-60 wt % calcium bromide. The liquid sorbing composition additionally includes a compound selected from a group comprising a nitrate compound, a nitrite compound and a combination of a nitrate and a nitrite compound. The aluminosilicate material contains montmorillonite and/or kaolin. Mercury content is continuously monitored. Samples are periodically collected and mercury content is measured.

EFFECT: invention enables to reduce mercury emissions when burning fuel.

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