Plant ash-based method for desulfurization, denitration and demercuration of double impact beds

Abstract

The invention relates to a plant ash-based method for desulfurization, denitration and demercuration of double impact beds. The method is characterized in that flue gas containing SO2, NOx and mercury from a burner is cooled by a flue-gas temperature regulator, and is sprayed into impact-bed reactors by laval spraying pipes; a plant ash type absorbing agent is sprayed into the impact-bed reactors by the laval spraying pipes which are coaxially and oppositely distributed; two strands of air flow oppositely impact in the reactors and realize absorption and removal of the SO2, the NOx and the mercury; the impact bed reactors are symmetrically distributed, and when the left impact bed reactor is regenerated, the flue gas from the burner is automatically switched and flows into the right impact bed reactor; the two impact bed reactors are mutually crossed for use and regeneration. The method has the advantages that biomass burning waste is utilized for the desulfurization, the denitration and the demercuration simultaneously, the purpose of using waste to treat waste can be achieved, and no secondary pollution is caused in the removing process, so that the invention relates to a flue-gas purifying method and device with wide application prospects.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollutant control, in particular to a plant ash-based double impact bed desulfurization, denitrification and mercury removal method. Background technique [0002] Sulfur oxides, nitrogen oxides and mercury produced in the combustion process can cause serious hazards such as acid rain, photochemical smog, carcinogenicity and teratogenicity. Therefore, developing effective methods for flue gas desulfurization, denitrification and mercury removal is one of the important tasks of environmental protection scientists and technicians in various countries. [0003] In recent years, although people have developed a large number of flue gas desulfurization, denitrification and demercury technologies, due to the limitations of human understanding and the gradual development of science and technology, the existing desulfurization, denitration and demercury technologies were only developed for a single Poll...

AI Technical Summary

Problems solved by technology

Adsorption flue gas purification technology is a traditional flue gas treatment technology. It has the characteristics of small initial investment, simple process flow and easy removal of multiple pollutants at the same time. It is a flue gas purification technology with good development and application prospects. , but the research progress of the traditional adsorption flue gas purification technology has been relatively slow. There are three main reasons: first, the existing mature adsorbents, such as activated carbon, are extremely expensive and difficult to achieve large-scale industrial application; second, Most of the new adsorbents currently researched generally have the disadvantages of high cost, poor stability, and poor multi-pollutant removal ability; thirdly, the reactors currently used for adsorbent adsorption mainly include fixed bed reactors and fluidized bed reactors. , the mass transfer rate of both reactors is very small

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