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Method and system for performing simultaneous desulfurization, denitrification and demercuration by ozone in combination with microwave-excited magnetically-separable catalyst

A technology of desulfurization, denitrification, mercury removal and magnetic separation, applied in the field of flue gas purification, can solve problems such as hindering the transmission of ultraviolet light, difficulty in large-scale reaction devices, and restrictions on the industrial application of photochemical removal systems

Active Publication Date: 2017-12-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that even in pure water, the effective propagation distance of 254nm short-wave ultraviolet light is only a few centimeters, which will make it difficult to scale up the reaction device
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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  • Method and system for performing simultaneous desulfurization, denitrification and demercuration by ozone in combination with microwave-excited magnetically-separable catalyst
  • Method and system for performing simultaneous desulfurization, denitrification and demercuration by ozone in combination with microwave-excited magnetically-separable catalyst
  • Method and system for performing simultaneous desulfurization, denitrification and demercuration by ozone in combination with microwave-excited magnetically-separable catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Example 1. SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 300ppm and 50μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 80ppm, the molar concentration of potassium hydrogen persulfate compound salt is 0.3mol / L, the pH of the solution is 3.8, the catalyst CoFe 2 o 4 The dosage is 0.3kg per cubic meter, and 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 82.2%, 55.2% and 83.1%, respectively.

Embodiment 2

[0102] Example 2. SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 300ppm and 50μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 120ppm, the molar concentration of potassium hydrogen persulfate compound salt is 0.6mol / L, the pH of the solution is 3.8, the catalyst CoFe 2 o 4 The dosage is 0.4kg per cubic meter, and the microwave radiation power density is 600W / 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 89.2%, 65.2% and 95.1%, respectively.

Embodiment 3

[0103] Example 3. SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 300ppm and 50μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 160ppm, the molar concentration of potassium hydrogen persulfate compound salt is 1.0mol / L, the pH of the solution is 3.8, the catalyst CoFe 2 o 4 The dosage is 0.6kg per cubic meter, and the microwave radiation power density is 800W / 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%, 92.2% and 100%, respectively.

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Abstract

The invention provides a system for performing simultaneous desulfurization, denitrification and demercuration by ozone in combination with a microwave-excited magnetically-separable catalyst. Flue gas from a coal-fired boiler or an industrial kiln is dedusted and cooled, and part of SO2, NO and HgO are pre-oxidized in a flue; peroxides are activated in a microwave spay reactor by microwave in cooperation with the magnetically-separable catalyst to generate hydroxyl radicals and sulfate radicals so as to finally oxidize the rest of SO2, NO and HgO as well as NO2 and SO3 from pre-oxidization into a gas mixture of sulfuric acid, nitric acid and divalent mercury; the generated gas mixture of sulfuric acid, nitric acid and divalent mercury is washed and absorbed by a spraying tower at the tail to generate a mixed solution of sulfuric acid, nitric acid and divalent mercury; the mixed solution of sulfuric acid, nitric acid and divalent mercury generated in the spraying tower enters a catalyst magnetic separation tower to receive magnetic separation so as to recycle the catalyst. The system of the invention provides 100% removal of SO2, NO and HgO, 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 a simultaneous desulfurization, denitrification and mercury removal system based on advanced oxidation of ozone, hydroxyl and sulfate radical radicals. Background technique [0002] SO produced during combustion in boilers and kilns 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 and development, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/86B01D53/96B01D53/60
CPCB01D53/75B01D53/76B01D53/8637B01D53/8665B01D53/96B01D2251/104B01D2251/106B01D2255/2073B01D2255/20738B01D2255/20746B01D2255/20761B01D2255/20792Y02A50/20
Inventor 刘杨先刘子洋赵亮王智化张军
Owner JIANGSU UNIV
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