Flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption

Abstract

The invention belongs to the technical field of flue gas purification, and particularly relates to a flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption. The system comprises a gas-like phase reagent generating device, a preoxidation device and an absorption tower. The removal method comprises the following steps that 1, a gas-like phase composite oxidant is prepared; 2, a preoxidation reaction is performed, wherein the gas-like phase composite oxidant is utilized to efficiently oxidize NO and Hg<0> in a gas phase; 3, an absorption reaction is performed, wherein mixed liquor of sodium humate and ammonia water serves as absorption seriflux to absorb and remove SOx, NOx and Hg<2+> in oxidation products. According to the flue gas integration removal system and method by means of gas-like phase preoxidation combining with absorption, the two-level arrangement mode of combining preoxidation with absorption is adopted to perform integration removal on multiple pollutants of coal-fired flue gas, and therefore the problems that in an existing hierarchical arrangement mode, a system is complex, the floor space is large, and the operating cost is slightly high are solved; the desulfuration, denitration and mercury removal efficiency can meet the current pollutant discharge standard, a removal product is sulphureous and nitrogenous compound fertilizer, and higher economic and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to an integrated flue gas removal system and method combined with gas-phase pre-oxidation combined with absorption. Background technique [0002] Particulate matter and SO from coal combustion 2 , NO x and trace heavy metals (Hg 0 ) is one of the causes of frequent smog in my country, which poses a serious threat to human life and health and sustainable ecological development. Therefore, the control of coal-fired flue gas pollutants is imminent. The existing desulfurization, denitrification and mercury removal systems in thermal power plants are wet limestone-gypsum system (WFGD), selective catalytic reduction system (SCR) and activated carbon injection system (ACI). , System complexity and high operating costs. Therefore, research and development of a new process for simultaneous desulfurization, denitrification and mercury removal of flue gas with low...

AI Technical Summary

Problems solved by technology

Wet technology is mainly divided into wet oxidation method and wet complexation absorption method. Wet technology has the advantages of high removal efficiency, strong adaptability to coal types and stable operation, but there are also problems of chloride ion corrosion, wastewater treatment, energy consumption and operation relatively high cost

Dry technology has the advantages of no wastewater treatment, but has disadvantages such as poor system operation stability, low removal efficiency, and inability to meet existing discharge standards.

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