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Integrated flue gas purification system and method for ozone and microwave excitation of fly ash-induced free radicals

A flue gas purification system and a technology of cooperating with microwaves, applied in the field of flue gas purification, can solve the problems of short ultraviolet light penetration distance, hinder ultraviolet light transmission, restrict the industrial application of photochemical removal system, etc., and achieve good engineering use and practical experience. , the effect of broad market development and application prospects

Active Publication Date: 2019-12-31
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two patents use ultraviolet light as the excitation source, but the penetration distance of ultraviolet light in water is extremely short. Even in pure water, the effective propagation distance of 254nm short-wave ultraviolet light is only a few centimeters, which will cause the reaction device Difficult to scale up
In addition, impurities such as particulate matter in the actual coal-fired flue gas will seriously hinder the transmission of ultraviolet light, thereby affecting the safe and efficient operation of the photochemical removal system.
Therefore, the above deficiencies seriously restrict the industrial application of photochemical removal systems.

Method used

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  • Integrated flue gas purification system and method for ozone and microwave excitation of fly ash-induced free radicals
  • Integrated flue gas purification system and method for ozone and microwave excitation of fly ash-induced free radicals
  • Integrated flue gas purification system and method for ozone and microwave excitation of fly ash-induced free radicals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 400ppm and 60μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 100ppm, the molar concentration of ammonium persulfate is 0.2mol / L, the solution pH is 3.8, and the fly ash concentration is 5g / m 3 , the microwave radiation power density is 300W / m 3 , the liquid-gas ratio is 3L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO and Hg 0 The simultaneous removal efficiencies can reach 90.1%, 53.1% and 89.8%, respectively.

Embodiment 2

[0067] SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 400ppm and 60μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 100ppm, the molar concentration of ammonium persulfate is 0.6mol / L, the solution pH is 3.8, and the fly ash concentration is 5g / m 3 , the microwave radiation power density is 300W / m 3 , the liquid-gas ratio is 3L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO and Hg 0 The simultaneous removal efficiencies can reach 100%, 73.9% and 100%, respectively.

Embodiment 3

[0069] SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 400ppm and 60μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 200ppm, the molar concentration of ammonium persulfate is 0.6mol / L, the solution pH is 3.8, and the fly ash concentration is 5g / m 3 , the microwave radiation power density is 300W / m 3 , the liquid-gas ratio is 3L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO and Hg 0 The simultaneous removal efficiencies can reach 100%, 87.3% and 100%, respectively.

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Abstract

The invention provides a system and method for integrated purification of flue gas by ozone in cooperation with microwave-excited flyash to induce free radicals. Flue gas containing SO2, NO and HgO from a combustor is dedusted and cooled, and part of SO2, NO and HgO are pre-oxidized in a flue by ozone; persulfates are activated in a microwave spray reactor by microwave-excited flyash to generate hydroxyl and sulfate radicals which finally oxidize the rest of SO2, NO and HgO as well as NO2 and SO3 from pre-oxidization into a mixed solution of sulfuric acid, nitric acid and divalent mercury; the divalent mercury in the mixed solution enters a mercury separation tower to receive separation and recycling, while the sulfuric acid and nitric acid solution enters a neutralizing tower to generate ammonium sulfate and ammonium nitrate solution which finally enters an evaporative crystallization and separation tower, and solid ammonium sulfate and ammonium nitrate fertilizers are obtained by evaporative crystallization of a high-temperature flue gas waste heat utilization system. The system of the invention can provide efficient integrated desulfurization, denitrification and demercuration, the removal process is free of secondary pollution, and the system has a promising market application prospect.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to an integrated desulfurization, denitrification and mercury removal system and method based on free radical advanced oxidation. Background technique [0002] SO produced in the combustion of coal-fired boilers, industrial kilns and waste incinerators 2 ﹑NO x And Hg can cause serious air pollution such as acid rain, photochemical smog and carcinogenic / teratogenic. Therefore, research and development of cost-effective flue gas desulfurization, denitrification and mercury removal methods is an important task for environmental protection scientists and technicians in various countries. In the past few decades, although people have developed a large number of flue gas desulfurization, denitrification and demercury technologies, the existing desulfurization, denitrification and demercuration technologies only aimed at the removal of a single pollutant at the beginning of research ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/60B01D53/64B01D53/90C05C13/00
CPCB01D53/007B01D53/60B01D53/64B01D53/75B01D53/76B01D53/8637B01D53/8665B01D53/90B01D2251/10B01D2251/104B01D2251/608B01D2257/602B01D2258/0283B01D2259/806C05C1/00C05C3/00Y02P20/129
Inventor 刘杨先刘子洋赵亮王智化张军
Owner JIANGSU UNIV
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