A method and device for simultaneous desulfurization, denitrification and mercury removal by photolysis of hypochlorous acid

Abstract

The invention relates to a method and device for photolysis of hypochlorous acid and simultaneous desulfurization, denitrification and demercuration. Chlorine is sprayed into water from a chlorine inlet through an aeration pipe by to form a hypochlorous acid solution; the activated carbon fiber onto an adsorption reaction column passes through a rotating immersion solution, and hypochlorous acid is adsorbed on the surface; under UV irradiation, the surface of activated carbon fiber on the adsorption reaction column produces high-activity chlorine atoms and hydroxyl due to hypochlorous acid decomposition; flue gas containing SO2, NOx and HgO from a boiler enters a photolysis adsorbent bed from a flue gas entrance and contacts with the activated carbon fiber adsorption column; SO2, NOx and HgO in flue gas and hydroxyl produce an oxidation reaction on the surface of activated carbon fiber on the adsorption reaction column, and are fixed on the surface of the activated carbon fiber; when the adsorption reaction column continues to rotate and is immersed in the solution again, the adsorbed SO2, NOx and HgO oxidation products enter the solution after falling due to ultrasonic oscillation.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollutant control, in particular to a method and device for simultaneous desulfurization, denitrification and mercury removal by photolysis of hypochlorous acid. Background technique [0002] SO produced during combustion 2 ﹑NO x and Hg 0 It 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. 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 Pollutant...

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 flue gas purification technology with good development and application prospects. , but the research progress of traditional wet flue gas purification technology has been relatively slow, the main reason is that flue gas 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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