Method for removing mercury for flue gas by using sulfo-halogen compound-supported modified adsorbent

A compound and adsorbent technology, applied in the field of flue gas mercury removal, can solve the problems of reducing the amount of adsorbent used, secondary pollution, etc., and achieve the effect of reducing secondary pollution of the environment

Inactive Publication Date: 2006-12-27
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the existing mercury pollution control technology, and propose a method for removing mercury from flue gas by using sulfur-halogen compound loaded modified adsorbent, which can significantly improve the adsorption effect of elemental mercury in flue gas and reduce the adsorption The amount of agent used, and can avoid secondary pollution to the environment

Method used

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  • Method for removing mercury for flue gas by using sulfo-halogen compound-supported modified adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1 (activated carbon supported disulfur dichloride)

[0029] Loading method: take 5 mL of disulfur dichloride (analytical purity, >98%), and put it into a 50 mL glass vaporizer. Immerse 2 / 3 of the volume of the vaporizer in an oil bath, and use the oil bath to control the temperature of the vaporizer. In addition, 100 g of activated carbon with a particle size of 100-120 mesh was weighed, and it was placed in a three-necked flask with a volume of 500 mL as an adsorption bottle. One port of the flask is used to install the stirrer, and the other two ports are respectively used as the inlet and outlet of sulfur dichloride vapor. Connect the gas outlet of the vaporizer bottle to the gas inlet of the adsorption bottle.

[0030] Turn on the heating power of the oil bath to keep the temperature of the vaporizing bottle at about 120°C, disulfur dichloride is continuously evaporated and vaporized, and its vapor is introduced into the adsorption bottle. The stirrer ...

Embodiment 2

[0035] Using a loading method similar to that of Example 1, disulfur dibromide was vaporized at 200° C., and the activated carbon powder was fumigated and loaded with its steam, so that the loading of dibromide on the activated carbon was about 0.5%. 0.02g of activated carbon was weighed as an adsorbent, and the main experimental conditions were the same as in Example 1 for the adsorption experiment of mercury-containing gas.

[0036] It was found that activated carbon loaded with disulfur dibromide had a better adsorption effect on elemental mercury. When the adsorption time was 100 minutes, the removal rate of elemental mercury was still above 92%.

Embodiment 3

[0038] Using a loading method similar to that of Example 1, sulfur and disulfur dibromide were vaporized at a temperature of 200° C., and loaded on different coal-fired fly ash, respectively, with a loading amount of about 0.5%. Weigh 0.1 g of the modified adsorbent respectively, so that the thickness of the adsorption layer is about 2 mm. The adsorption experiment conditions of mercury-containing gas are also the same as in Example 1.

[0039] It was found that the fly ash loaded with disulfide dibromide had a better adsorption effect on elemental mercury. When the adsorption time was 30 minutes, the removal rate of elemental mercury was still above 85%. And under the same situation, when using the fly ash loaded with sulfur or the fly ash not loaded with any substance, the adsorption effect on elemental mercury is very poor. When the adsorption time is 5 minutes, the removal rate of elemental mercury drops below 20%. .

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Abstract

The invention relates to a method for removing mercury in flue gas by using chalcohalide compound modified absorption. The method is characterized in that: compound containing sulphur and halogen or its precursor is used as modifier for supported modification for adsorbent to make the surface mercury absorption characterization of absorbent change, The weight percentage of supported chalcohalide compound in absorbent is 0.01 to 10%, and the modified absorbent is connected with flue gas in flue gas filling and direct blowing-in manner direct for flue gas mercury removal. The modified absorbent is provided with high absorption capacity for mercury in flue gas, and mercury can be converted to stable mercuric sulphide by using the modified absorbent, as a result, the secondary pollution can be solved.

Description

technical field [0001] The invention relates to a method for removing mercury from flue gas by using a sulfur-halogen compound-loaded modified adsorbent. By modifying the mercury-removing adsorbent, it can efficiently remove mercury in different forms in coal-fired flue gas, and It is converted into stable mercury sulfide, so as to achieve a more thorough treatment of mercury in flue gas. Background technique [0002] Mercury has strong physiological toxicity. Although its concentration in flue gas is low, its harm in the environment is quite serious. In March 2005, the United States officially promulgated the mercury emission control standard for thermal power plants, and other countries will also formally issue relevant standards. Due to the generally high mercury content in my country's coal combustion, and its huge coal consumption, my country has become the country with the most serious mercury pollution in the world. Therefore, it is very urgent to strengthen the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01D53/64B01J20/02
Inventor 晏乃强张世哲吴忠标贾金平徐新华孙巍
Owner SHANGHAI JIAO TONG UNIV
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