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Method and device for removing mercury from flue gas through optical radiation chlorine atoms and hydroxide radicals

A technology of light radiation and chlorine atoms, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of high application cost and unaffordable enterprises, and achieve simple equipment, small initial investment, and broad development and application prospects Effect

Active Publication Date: 2016-08-10
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most researched and most mature activated carbon adsorption method has high mercury removal efficiency, but the application cost is extremely high, which is unaffordable for enterprises.
In summary, there is currently no coal-fired flue gas mercury removal technology suitable for large-scale commercialization.

Method used

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  • Method and device for removing mercury from flue gas through optical radiation chlorine atoms and hydroxide radicals
  • Method and device for removing mercury from flue gas through optical radiation chlorine atoms and hydroxide radicals
  • Method and device for removing mercury from flue gas through optical radiation chlorine atoms and hydroxide radicals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The vertical distance A between the adsorption reaction column 10 and the ultraviolet lamp 5 is 20 cm, the horizontal distance D between the ultraviolet lamp 5 and the ultraviolet lamp 5 is 20 cm, the distance C between the flue gas inlet 1 is 25 cm, and the chlorine gas aeration pipe 4 bulges out The average diameter of the small bubbles is 50 microns, the vertical distance or depth B of the adsorption reaction column 10 busbars entering the solution is 7cm, the ultraviolet lamp 5 and the quartz sleeve are inserted 15cm below the liquid surface, and the end surface of the ultrasonic transmitter and the bottommost part of the adsorption reaction column 10 Maintaining a vertical distance of 3 cm, the adsorption reaction column 10 rotates counterclockwise, the diameter of the adsorption reaction column 10 is 50 cm, and the rotational speed r is 15 rpm. The temperature of flue gas inlet 1 is 120°C, and the liquid-gas ratio is 8L / m 3 , the dosage of chlorine gas is 2.0L (ch...

Embodiment 2

[0045] The vertical distance A between the adsorption reaction column 10 and the ultraviolet lamp 5 is 20 cm, the horizontal distance D between the ultraviolet lamp 5 and the ultraviolet lamp 5 is 20 cm, the distance C between the flue gas inlet 1 is 25 cm, and the chlorine gas aeration pipe 4 bulges out The average diameter of the small bubbles is 50 microns, the vertical distance or depth B of the adsorption reaction column 10 busbars entering the solution is 7cm, the ultraviolet lamp 5 and the quartz sleeve are inserted 15cm below the liquid surface, and the end surface of the ultrasonic transmitter and the bottommost part of the adsorption reaction column 10 Maintaining a vertical distance of 3 cm, the adsorption reaction column 10 rotates counterclockwise, the diameter of the adsorption reaction column 10 is 50 cm, and the rotational speed r is 15 rpm. The flue gas inlet 1 temperature is 120°C, and the liquid-gas ratio is 5L / m 3 , the dosage of chlorine gas is 3.0L (chlor...

Embodiment 3

[0047] The vertical distance A between the adsorption reaction column 10 and the ultraviolet lamp 5 is 20 cm, the horizontal distance D between the ultraviolet lamp 5 and the ultraviolet lamp 5 is 20 cm, the distance C between the flue gas inlet 1 is 25 cm, and the chlorine gas aeration pipe 4 bulges out The average diameter of the small bubbles is 50 microns, the vertical distance or depth B of the adsorption reaction column 10 busbars entering the solution is 7cm, the ultraviolet lamp 5 and the quartz sleeve are inserted 15cm below the liquid surface, and the end surface of the ultrasonic transmitter and the bottommost part of the adsorption reaction column 10 Maintaining a vertical distance of 3 cm, the adsorption reaction column 10 rotates counterclockwise, the diameter of the adsorption reaction column 10 is 50 cm, and the rotational speed r is 15 rpm. The flue gas inlet 1 temperature is 120°C, and the liquid-gas ratio is 5L / m 3 , the dosage of chlorine gas is 1.0L (chlor...

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Abstract

The invention provides a method and device for removing mercury from flue gas through optical radiation chlorine atoms and hydroxide radicals. The mercury-containing flue gas from a boiler enters an optical radiation adsorption washing bed and is in contact with the active carbon fibers on an adsorption reaction column; chlorine forms a hypochlorous acid solution in water; the active carbon fibers on the reaction column are rotated and soaked into the solution and then absorb hypochlorous acid on the surface; under the radiation of ultraviolet light, the hypochlorous acid on the surfaces of the active carbon fibers is decomposed into high-activity chlorine atoms and hydroxide radicals; the mercury in flue gas has oxidizing reaction with the hydroxide radicals and is fixed on the surfaces of the active carbon fibers; and the reaction column is rotated and soaked into the solution again, the mercury oxidative products absorbed on the surfaces fall off and then enter the solution, so that the continuous demercuration and washing processes are completed. The mercury-removing oxidative products are precipitated and separated and then are recycled, and the chlorine remaining in the flue gas is absorbed, separated and then recycled. The system has ultrahigh oxidability, the mercury-removing rate reaches 100%, the removing process is free from secondary pollution, and thus the method has wide market application prospects.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollutant control, in particular to a method and a device for removing mercury from flue gas by light radiation of chlorine atoms and hydroxyl groups. Background technique [0002] Mercury is a highly toxic heavy metal trace element, which is extremely harmful to human health and the ecological environment. my country is the world's largest coal consumer, and the proportion of coal in the energy structure is as high as 75%, and this pattern will not change significantly for a long period of time in the future. With the increasingly stringent air environmental protection standards for coal-fired pollutants, it is expected that the release of mercury pollution control standards for coal-fired flue gas will be an inevitable trend in the near future. Scholars at home and abroad have done a lot of fruitful work in the field of research on new theories and technologies of mercury removal. At present...

Claims

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Application Information

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IPC IPC(8): B01D53/64B01D53/78
CPCB01D53/64B01D53/78B01D2251/10B01D2258/0283
Inventor 刘杨先张军潘剑锋张永春谢芳郝建刚
Owner JIANGSU UNIV
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