Fume purification system based on advanced oxygenation combining wet scrubbing

Abstract

The invention provides a fume purification system based on advanced oxygenation combining wet scrubbing. The system is a combustion and exhaust system formed by a boiler, an ozone generator, a stirrer, a swirl nozzle, a reactor, a gas-liquid absorption tower and a chimney, wherein fume containing sulfur oxide, nitric oxide and mercury generated by combustion of the boiler and O3 generated by the ozone generator enter the stirrer together, are mixed, flow through the swirl nozzle, and are sprayed into the reactor with an ultraviolet lamp tube; and hydroxyl radical (.OH) with strong oxidability generated under excitation of ultraviolet radiation, SO2 in the fume, indissoluble NO and HgO are oxidized into gaseous products with higher dissolubility and enter the gas-liquid absorption tower to be absorbed and removed by water; Hg<2+> generated in the gas-liquid absorption tower captures and retrieves mercuric sulfide by adding sulfidion S<2-> in equal molar ratio; and the residual sulfuric acid and nitric acid mixed solution is used as an industrial raw material for recycling, and the cleaned fume enters the chimney so as to be exhausted.

Description

technical field [0001] The invention relates to the control of flue gas emission pollutants in the combustion process, in particular to a flue gas purification system based on advanced oxidation combined with wet scrubbing. Background technique [0002] Sulfur oxides, nitrogen oxides, and mercury produced during combustion can cause serious hazards such as acid rain, photochemical smog, and 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. 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 Pollut...

AI Technical Summary

Problems solved by technology

Wet 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 very promising flue gas purification technology for development and application. , but the research progress of traditional wet flue gas purification technology has been relatively slow, the main reason is that nitrogen oxides and mercury elements contain more than 90% insoluble NO and 40-80% insoluble Hg 0

According to the double-membrane theory, the gas-phase molecules must first dissolve into the liquid phase through mass transfer and diffusion processes from the gas state, and then they can undergo chemical reactions and be fixed in the absorption liquid, while NO and Hg 0 The insoluble characteristics greatly increase the absorption and mass transfer resistance in the liquid phase, and it is difficult to significantly increase the NO and Hg levels only by adjusting the pH and temperature of the absorption liquid. 0 Solubility in the liquid phase, this characteristic has caused the traditional wet desulfurization, denitrification and mercury removal technology to generally have high desulfurization efficiency, but low denitrification and mercury removal efficiency, etc. In fact, it is impossible to achieve real simultaneous desulfurization, denitrification and mercury removal

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