Flue gas emission system of single-drum four-return-stroke biomass burning corner tube boiler

Abstract

The invention discloses a flue gas emission system of a single-drum four-return-stroke biomass burning corner tube boiler. The flue gas emission system comprises a first return stroke, a second returnstroke, a third return stroke and a fourth return stroke which are sequentially arranged in the horizontal direction. The lower end of the first return stroke is open, the upper end of the first return stroke communicates with the upper end of the second return stroke, the lower end of the second return stroke communicates with the lower end of the third return stroke, and the upper end of the third return stroke communicates with the upper end of the fourth return stroke. The first return stroke is a hearth, the second return stroke is a membrane type wall cavity, the third return stroke isa flag type heating surface cavity, and the fourth return stroke is a tail flue. According to the flue gas emission system, four-return-stroke arrangement is adopted, the probability of coking corrosion of the heating surface is reduced, emission of nitric oxides is reduced, and fuel can be burnt more sufficiently.

Description

technical field [0001] The invention relates to a flue gas discharge system of a single-drum four-pass biomass-fired corner tube boiler. Background technique [0002] Biomass fuel is a compact cylindrical fuel with a length of 5-30mm that uses lignin as a binder to compress loose straw, branches and wood chips and other agricultural and forestry biomass under a certain temperature and pressure. Biomass pellet fuel is a renewable carbon source, which has the characteristics of wide sources, good combustion performance, less harmful gas emissions, and relatively low price. The amount is reduced, the combustion characteristics are obviously improved, and the utilization efficiency is significantly improved. Therefore, with the increasingly stringent national environmental protection policies, replacing other fossil fuels with biomass fuels is one of the effective ways to achieve energy conservation and emission reduction. [0003] Biomass fuel has high water content and high ...

AI Technical Summary

Problems solved by technology

Therefore, the unstable operation of the boiler, insufficient combustion, serious coking, and corrosion of the heating surface have become problems that need to be solved urgently.

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