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Simultaneous desulfurization, denitrification and demercury method based on hydroxyl and sulfate radical oxidation

A technology for desulfurization, denitrification, mercury removal and sulfate radical removal. It is applied in chemical instruments and methods, separation methods, and dispersed particle separation, and can solve problems such as increased initial investment and operating costs.

Inactive Publication Date: 2016-08-17
南京朗洁环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a separate flue gas mercury removal system is added at the end of the existing desulfurization and denitrification system, it will inevitably cause a further increase in the initial investment and operating costs of the entire system, and ultimately it will be difficult to obtain large-scale commercial applications in developing countries

Method used

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  • Simultaneous desulfurization, denitrification and demercury method based on hydroxyl and sulfate radical oxidation
  • Simultaneous desulfurization, denitrification and demercury method based on hydroxyl and sulfate radical oxidation
  • Simultaneous desulfurization, denitrification and demercury method based on hydroxyl and sulfate radical oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Example 1. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 2000ppm, 400ppm and 50μg / m 3 , the flue gas temperature is 50°C, the wavelength of ultraviolet light is 254nm, and the intensity of UV radiation is 30μW / cm 2 , the molar concentration of ammonium persulfate is 0.6mol / L, the pH of the solution is 3.5, and the liquid-gas ratio is 2L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 97.2%, 72.2% and 83.3%, respectively.

Embodiment 2

[0067] Example 2. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 2000ppm, 400ppm and 50μg / m 3 , the flue gas temperature is 50°C, the wavelength of ultraviolet light is 254nm, and the intensity of UV radiation is 30μW / cm 2 , the molar concentration of hydrogen peroxide is 0.6mol / L, the pH of the solution is 3.5, and the liquid-gas ratio is 2L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 99.3%, 75.4% and 86.2%, respectively.

Embodiment 3

[0068] Example 3. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 2000ppm, 400ppm and 50μg / m 3 , the flue gas temperature is 50°C, the wavelength of ultraviolet light is 254nm, and the intensity of UV radiation is 30μW / cm 2 , the molar concentration of ammonium persulfate is 1.2mol / L, the pH of the solution is 3.5, and the liquid-gas ratio is 2L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 100%, 82.5% and 89.7%, respectively.

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Abstract

The invention relates to a method for simultaneous desulfurization denitrification and mercury removal based on hydroxyl and sulphate radical oxidation. According to the method, ultraviolet radiation is adopted to decompose peroxide to produce hydroxyl and sulphate radical with strong oxidizing property, which serves as an oxidizing agent, and oxidation is performed in an impact bed, so as remove SO2, NOx and Hg0 in flue gas. The flue gas from an emission source is mixed with peroxide solution and then is sprayed into the impact bed at a high speed through coaxially and oppositely distributed nozzles, and two atomized gas-liquid mixtures are oppositely impacted and mixed in the impact bed. Ultraviolet radiation decomposes the peroxide in the solution to produce hydroxyl and sulphate radical to oxidize and remove the SO2, NOx and Hg0; divalent mercury produced during reaction enters a mercury separation tower, so as to be separated and recycled; sulfuric acid and nitric acid solution enter an absorption tower to produce ammonium sulfate and ammonium nitrate solution; the ammonium sulfate and ammonium nitrate solution finally enter an evaporation crystallization tower to produce solid ammonium sulfate and ammonium nitrate solution. A system can realizes complete removal of the SO2, NOx and Hg0, no secondary pollution exists during removal, and the method has a wide market application prospect.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollutant control, in particular to a simultaneous desulfurization, denitrification and demercury method based on the oxidation of hydroxyl and sulfate radical radicals. Background technique [0002] SO produced during industrial production and combustion 2 ﹑NO x And Hg can cause acid rain, photochemical smog and carcinogenic and other serious air pollution problems, endangering human health and ecological balance. 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 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 th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/74B01D53/60B01D53/64
CPCY02A50/20
Inventor 刘杨先王燕张军阮小娇
Owner 南京朗洁环保科技有限公司