Combustion and smoke and dust removal method of small boiler combusting soft coal II and III

Abstract

The invention discloses a combustion and smoke and dust removal method of small boiler combusting soft coal II and III. The method comprises the following steps of: (1) combustion and smoke removal: in combustion work of a boiler, primary air enters a fire grate so as to combust coal in a hearth, fume generated in the combustion process in the hearth is blocked by a furnace arch arranged at the back of the hearth and negative pressure is formed at the same time; secondary air is opened automatically to feed air in the furnace arch so as to form an oxygen-enriched region at a furnace arch port, and smoke dust is combusted fully again at the furnace arch port; and (2) dust removal: the fume after combustion and smoke removal enters a first heat exchange region of the boiler to carry out heat exchange and sequentially enters a plurality of rows of vertical fume pipes in a second heat transfer region, wherein the fume enters a first vertical fume pipe from top to bottom, enters a second vertical fume pipe from bottom to top, enters a third vertical fume pipe top to bottom and so on, and dust of the fume in a circulation process falls into a dust cleaning opening. By the method provided by the invention, the small boil can achieve the effects of high-efficiency combustion and cleaning discharge when combusting soft coal II and III, and the heat efficiency of the boiler is improved.

Description

technical field [0001] The invention belongs to the field of boilers, and in particular relates to a method for eliminating smoke and dust by burning Class II and III bituminous coal in a small boiler. Background technique [0002] Coal-fired small boilers are widely used in industrial and agricultural production and daily life. But looking at the existing coal-fired small boilers either burn anthracite, or burn Class II and III bituminous coal. For burning anthracite, although its emissions can meet environmental protection requirements, the disadvantages of high price of anthracite and high operating costs of boilers are very obvious. Compared with burning anthracite, burning Class II and III bituminous coal has the advantage of being economical, but its disadvantages of black smoke and smoke emission not up to standard are also prominent. Contents of the invention [0003] The object of the present invention is to provide a method for eliminating smoke and dust by bur...

AI Technical Summary

Problems solved by technology

For burning anthracite, although its emissions can meet environmental protection requirements, the disadvantages of high anthracite price and high boiler operating costs are very obvious

Compared with burning anthracite, burning Class II and III bituminous coal has economical advantages, but its disadvantages of black smoke and smoke emission are also prominent

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