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A method for removing hydrogen sulfide based on photochemical free radicals

A technology of hydrogen sulfide and free radicals, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of complex by-products, low oxidation efficiency, unstable performance, etc., and achieve simple process and no secondary pollution Effect

Active Publication Date: 2017-05-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many problems in the hydrogen sulfide wet removal process, such as the high price, unstable performance, and even toxicity of newly synthesized various organic absorbents or oxidants.
The reaction process of oxidizing agents such as potassium permanganate will produce complex by-products, making it difficult to utilize the product
Oxidants such as hydrogen peroxide are clean and environmentally friendly, but the oxidation efficiency is very low, which makes the removal process unable to meet the increasingly stringent environmental protection requirements
[0005] To sum up, there is currently no stable, reliable, economical and effective process suitable for the removal of hydrogen sulfide from medium and low concentration waste gas.

Method used

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  • A method for removing hydrogen sulfide based on photochemical free radicals
  • A method for removing hydrogen sulfide based on photochemical free radicals
  • A method for removing hydrogen sulfide based on photochemical free radicals

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Example 1. The flue gas inlet temperature of the impingement bed is 50°C, and the liquid-gas ratio is 1.2L / m 3 , the concentration of hydrogen peroxide is 0.3mol / L, the pH of the solution is 2.2, the temperature of the solution is 50°C, the content of hydrogen sulfide in the flue gas is 400ppm, and the effective radiation intensity of ultraviolet light is 32μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The test results on the small-scale experimental system show that the hydrogen sulfide removal efficiency reaches 58.7%.

Embodiment 2

[0051] Example 2. The flue gas inlet temperature of the impingement bed is 50°C, and the liquid-gas ratio is 1.2L / m 3 , the concentration of ammonium persulfate is 0.3mol / L, the pH of the solution is 2.2, the solution temperature is 50°C, the hydrogen sulfide content in the flue gas is 400ppm, and the effective radiation intensity of ultraviolet light is 32μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The test results on the small-scale experimental system show that the hydrogen sulfide removal efficiency reaches 48.8%.

Embodiment 3

[0052] Example 3. The flue gas inlet temperature of the impingement bed is 50°C, and the liquid-gas ratio is 3.5L / m 3 , the concentration of hydrogen peroxide is 0.5mol / L, the pH of the solution is 2.2, the temperature of the solution is 50°C, the content of hydrogen sulfide in the flue gas is 400ppm, and the effective radiation intensity of ultraviolet light is 32μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The test results on the small-scale experimental system show that the hydrogen sulfide removal efficiency reaches 68.1%.

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Abstract

The invention relates to a hydrogen sulfide removal method based on photochemical free radicals. The method adopts ultraviolet light radiation to decompose a superoxide generating hydroxyl or sulfate free radicals with high oxidizing property as an oxidizing agent of hydrogen sulfide, and the hydrogen sulfide in flue gas is oxidized and removed in an impact bed. One part of flue gas from a combustor is injected into the impact bed at a high sped after being mixed with one part of superoxide solution, the other part of flue gas is injected into the impact bed by high-speed nozzles coaxially arranged in opposite directions after being mixed with the other part of superoxide solution, and the atomized gas-liquid mixture is impacted and mixed in the impact bed. The ultraviolet light radiation is used for decomposing the superoxide generating hydroxyl or sulfate free radicals to oxidize and remove the hydrogen sulfide, a sulfuric acid solution generated through reaction enters a neutralizing tower at the tail part to generate ammonium sulfate through ammonification and then enters an evaporative crystallization tower to generate a solid ammonium sulfate fertilizer. The system has extremely high oxidizability and can realize 100% removal rate, the removal process is free of secondary pollution, and the method has wide application prospect.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollution control, in particular to a method for removing hydrogen sulfide based on photochemical free radicals. Background technique [0002] Hydrogen sulfide in industrial raw gas, industrial waste gas and waste incineration tail gas is a highly irritating and highly toxic gas, and is one of the air pollutants. Under aerobic and humid heat conditions, hydrogen sulfide will not only cause equipment corrosion and catalyst poisoning, but also seriously threaten personal safety. With the rapid development of the economy and the improvement of people's awareness of environmental protection, the removal of hydrogen sulfide from tail gas has attracted more and more attention. At the same time, the country has also formulated corresponding laws and regulations to strictly limit the emission of hydrogen sulfide. The research and development of efficient hydrogen sulfide removal technology has become ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/79B01D53/52B01D53/73C05D11/00
Inventor 刘杨先邵霞潘振华
Owner JIANGSU UNIV