Single-boiler-barrel four-return-stroke biomass burning corner tube boiler

Abstract

The invention discloses a single-boiler-barrel four-return-stroke biomass burning corner tube boiler which is characterized in that two ends of a water circulation mechanism are connected to an inlet and an outlet of a boiler barrel, and the water circulation mechanism and a tail flue are fixedly arranged on a supporting frame body; the hearth is communicated with the upper end of the membrane type wall cavity, the membrane type wall cavity is communicated with the lower end of the flag type heating surface cavity, and the flag type heating surface cavity is communicated with the upper end of the tail flue; the side walls of the hearth, the membrane type wall cavity and the flag type heating surface cavity are all membrane type walls, the upper ends and the lower ends of the side walls of the hearth, the membrane type wall cavity and the flag type heating surface cavity are all communicated with the water circulation mechanism, a fire grate is arranged below the hearth, and the outer end of the fire grate is connected with a primary air supply outlet. The boiler is high in supporting strength, stable in structure, sufficient in fuel combustion, not prone to coking and corrosion on a heating surface and low in nitrogen oxide emission.

Description

technical field [0001] The invention relates to a single-drum four-return biomass-fired corner-tube boiler. Background technique [0002] Biomass fuel uses lignin as a binder under certain temperature and pressure to compress loose agricultural and forestry biomass such as straws, branches and wood chips into compact cylindrical fuels with a length of 5-30mm. Biomass pellet fuel is a renewable carbon source, with a wide range of sources, good combustion performance, less harmful gas emissions, and relatively low price. The amount of combustion is reduced, the combustion characteristics are significantly improved, and the utilization efficiency is significantly improved. Therefore, with the increasingly strict environmental protection policies of the country, biomass fuels to replace other fossil fuels is one of the effective ways to achieve energy saving and emission reduction. [0003] Biomass fuel has high water content and high drying requirements, low calorific value a...

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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