Novel gas reburning ultralow emission system of biomass combustion boiler

Abstract

The gas reburning ultra-low emission system comprises the boiler, and the gas outlet end of the boiler communicates with the lower portion of a chimney through a smoke pipe structure; the middle-upper part of the chimney is connected with the air inlet end of the boiler through a connecting pipe; a fan is mounted in the middle of the connecting pipe; the smoke pipe structure comprises a cyclone centrifugal machine communicated with the boiler, the cyclone centrifugal machine is communicated with a heat exchanger, and the heat exchanger is communicated with the lower portion of the chimney. A vulcanization area and a combustion area are sequentially formed in the boiler in the air flowing direction. The vulcanization area is provided with a reburning air nozzle group and a gas nozzle group; a feeding mechanism is further installed in cooperation with the boiler. The problem of insufficient fluidization kinetic energy caused by insufficient primary air flow speed in the prior art is solved, and the generation of nitrogen oxides can be effectively inhibited, so that the purpose of deeply reducing the nitrogen oxides is achieved on the basis of air staged combustion.

Description

technical field [0001] The invention belongs to the technical field of burners, and in particular relates to a novel gas reburning ultra-low emission system for biomass-fired boilers. Background technique [0002] Biomass power generation is the use of biomass energy combustion to generate power. This power generation method is a kind of renewable energy power generation. The raw materials include rice stalks, corn cob, peanut shells and other direct combustion power generation. In response to the country's call for zero carbon emissions, biomass burning has attracted more and more attention. [0003] At present, the flue gas treatment system of biomass fuel boilers mostly uses the flue gas treatment system of coal-fired boilers. There are many technical problems in the application of coal-fired technology to gas. Such saline-alkali substances will poison the catalyst with alkali metals, making the catalyst ineffective, resulting in excessive nitrogen oxide emissions. SUM...

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention discloses a gas reburning ultra-low emission system for biomass-fired boilers, which aims to solve the problem that the current biomass-fired boiler flue gas treatment systems in the prior art mostly use coal-fired boiler flue gas treatment There are many technical problems in the application of coal-fired technology to gas. Compared with the soot produced by coal-fired boilers, saline-alkaline substances such as sodium salt and potassium generated by biomass flue gas will poison the catalyst alkali metal, making the catalyst invalid, thus The problem of excessive nitrogen oxide emissions

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