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Modified fly ash adsorbent for mercury removal from flue gas and preparation method thereof

An adsorbent and fly ash technology, which is applied in the field of modified fly ash adsorbent and its preparation, can solve the problems that the mercury removal efficiency of power plants cannot meet the emission standards of co-pollutants, the efficiency of fly ash mercury removal is not high, and the injection cost is increased. , to achieve the effect of improved mercury removal effect, high efficiency advantage, and reduced injection cost

Active Publication Date: 2022-05-17
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Air Pollutant Emission Standard for Coal-fired Power Plants (GB13223-2011) issued by the Environmental Protection Bureau in 2015 stipulates that the emission standard for mercury pollutants in the flue gas of coal-fired power plants is 30 μg / m 3 At present, the existing pollutant purification devices in coal-fired power plants can fully meet this standard, but with the improvement of people's requirements for a clean environment, in 2015, Beijing stipulated that the mercury pollutant emission standard for new power plants in the city is 0.5 μg / m 3 In 2017, Shanghai stipulated that the emission standard of mercury pollutants from coal-fired power plants in the city was 10 μg / m 3 , and the mercury removal efficiency of the current power plant cannot meet the increasingly stringent requirements of co-pollutant emission standards
[0004] Because unmodified fly ash is not efficient in removing mercury and will increase the injection cost, it is generally necessary to modify the fly ash before injection

Method used

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  • Modified fly ash adsorbent for mercury removal from flue gas and preparation method thereof
  • Modified fly ash adsorbent for mercury removal from flue gas and preparation method thereof
  • Modified fly ash adsorbent for mercury removal from flue gas and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 1.5g CuCl 2 2H 2 O into the beaker, and then weighed 0.5gFeCl 3 ·6H 2 O and CuCl 2 2H 2 O mixed, adding 100 g of deionized water, after the chloride was completely dissolved, a mixed chloride solution was obtained. Weigh 5g of fly ash into a beaker, stir in an electromagnetic stirrer for 3h, let it stand for 10h, filter off the supernatant, put the remaining solid in a drying oven, and dry it in a drying oven at 50°C for 12h. The dried solid is ground into powder to obtain 1.5% CuCl 2 -0.5% FeCl 3 Modified fly ash adsorbent.

Embodiment 2

[0028] Weigh 1gCuCl 2 2H 2 O into the beaker, and then weigh 1gFeCl 3 ·6H 2 O and CuCl 2 2H 2 O mixed, adding 100 g of deionized water, after the chloride was completely dissolved, a mixed chloride solution was obtained. Weigh 5g of fly ash into a beaker, stir in an electromagnetic stirrer for 5h, let it stand for 12h, filter off the supernatant, put the remaining solid in a drying oven, and dry it in a drying oven at 60°C for 10h. The dried solid is ground into powder to obtain 1% CuCl 2 -1% FeCl 3 Modified fly ash adsorbent.

Embodiment 3

[0030] Weigh 0.5gCuCl 2 2H 2 O put into a beaker, and weigh 1.5g FeCl 3 ·6H 2 O and CuCl 2 2H 2 O mixed, adding 100 g of deionized water, after the chloride was completely dissolved, a mixed chloride solution was obtained. Weigh 5g of fly ash into a beaker, stir in an electromagnetic stirrer for 7h, let stand for 13h, filter off the supernatant, put the remaining solid in a drying oven, and dry it in a drying oven at 80°C for 9h. The dried solid is ground into powder to obtain 0.5% CuCl 2 -1.5% FeCl 3 Modified fly ash adsorbent.

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Abstract

The invention provides a modified fly ash adsorbent for flue gas mercury removal, the modified fly ash adsorbent includes copper chloride, ferric chloride and fly ash, the copper chloride: ferric chloride : The mass ratio of fly ash is 1‑6:1‑6:5. The copper-iron-chloride modified fly ash adsorbent of the invention has low cost, simple and convenient preparation method and high mercury removal efficiency. Using the copper-iron-chlorine modified fly ash adsorbent to remove mercury in flue gas can significantly improve the utilization efficiency of fly ash and reduce injection costs.

Description

technical field [0001] The invention belongs to the field of mercury removal from flue gas, and in particular relates to a modified fly ash adsorbent used for mercury removal from flue gas and a preparation method thereof. Background technique [0002] Flue gas pollutants from coal-fired power plants seriously pollute the environment. As a trace element, mercury occupies a certain proportion in the flue gas, which is very harmful to people, soil and aquatic organisms. The Air Pollutant Emission Standard for Coal-fired Power Plants (GB13223-2011) issued by the Environmental Protection Bureau in 2015 stipulates that the emission standard for mercury pollutants in the flue gas of coal-fired power plants is 30 μg / m 3 At present, the existing pollutant purification devices in coal-fired power plants can fully meet this standard, but with the improvement of people's requirements for a clean environment, in 2015, Beijing stipulated that the mercury pollutant emission standard for n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30B01D53/02
CPCB01J20/10B01D53/02B01D2257/602B01D2258/0283
Inventor 潘良明徐搏孙皖董玉泉石万元
Owner CHONGQING UNIV
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