Method for simultaneous desulfurization denitrification and mercury removal based on hydroxyl and sulphate 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: 2015-07-22
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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  • Method for simultaneous desulfurization denitrification and mercury removal based on hydroxyl and sulphate radical oxidation
  • Method for simultaneous desulfurization denitrification and mercury removal based on hydroxyl and sulphate radical oxidation
  • Method for simultaneous desulfurization denitrification and mercury removal based on hydroxyl and sulphate radical oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Example 1. SO in flue gas 2 NO x With Hg 0 The concentrations are 2000ppm, 400ppm and 50μg / m respectively 3 , The flue gas temperature is 50℃, the ultraviolet wavelength is 254nm, and the UV radiation intensity is 30μW / cm 2 , The molar concentration of ammonium persulfate is 0.6mol / L, the solution pH is 3.5, and the liquid-gas ratio is 2L / m 3 . The result of the small test: SO in the flue gas 2 NO x With Hg 0 The simultaneous removal efficiency 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 The concentrations are 2000ppm, 400ppm and 50μg / m respectively 3 , The flue gas temperature is 50℃, the ultraviolet wavelength is 254nm, and the UV radiation intensity is 30μW / cm 2 , The molar concentration of hydrogen peroxide is 0.6mol / L, the solution pH is 3.5, and the liquid-gas ratio is 2L / m 3 . The result of the small test: SO in the flue gas 2 NO x With Hg 0 The simultaneous removal efficiency can reach 99.3%, 75.4% and 86.2%.

Embodiment 3

[0068] Example 3. SO in flue gas 2 NO x With Hg 0 The concentrations are 2000ppm, 400ppm and 50μg / m respectively 3 , The flue gas temperature is 50℃, the ultraviolet wavelength is 254nm, and the UV radiation intensity 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 result of the small test: SO in the flue gas 2 NO x With Hg 0 The simultaneous removal efficiency can reach 100%, 82.5% and 89.7%.

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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 pollutants control, in particular to a method for simultaneous desulfurization, denitration and mercury removal based on the oxidation of hydroxyl radicals and sulfate radicals. Background technique [0002] SO produced during industrial production and combustion 2 NO x And Hg can cause serious air pollution problems such as acid rain, photochemical smog and carcinogenesis, and endanger human health and ecological balance. Therefore, the development of effective flue gas desulfurization, denitrification and mercury removal methods is one of the important tasks of environmental protection scientists in various countries. In the past few decades, although people have developed a large number of flue gas desulfurization, denitrification and mercury removal technologies, the existing various desulfurization, denitrification and mercury removal technologies were originally developed for a single pollutant...

Claims

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Application Information

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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
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