A kind of synergistic removal of hg in flue gas 0 and hg in effluent 2+ Methods

A flue gas and removal technology, applied in chemical instruments and methods, separation methods, water/sludge/sewage treatment, etc., can solve the problems of unfavorable mercury removal efficiency of activated carbon, affecting the subsequent use of fly ash, and expensive activated carbon. Achieve the effect of fast adsorption rate, stable structure and low price

Active Publication Date: 2021-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activated carbon injection technology still has the following problems: (1) The price of activated carbon is relatively expensive, the consumption is large, and the operating cost is high; (2) The activated carbon is removed by the dust removal device together with the fly ash in the flue gas. Affect the subsequent use of fly ash; (3) Activated carbon is sprayed into the flue before the dust removal device, and the flue contains a relatively high concentration of NO x and SO 2 , will adversely affect the mercury removal efficiency of activated carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Na 2 S 2 o 3 ·5H 2 O, FeSO 4 ·7H 2 Mix O and S with a molar ratio of 2:2:1 and add them into the autoclave, then add a certain amount of water, react at 200°C for 24h, cool to room temperature, centrifuge, wash with water 3-5 times, 60°C dried under vacuum to obtain FeS 2 Adsorbent with a specific surface area of ​​2.92 m 2 / g. Weigh FeS 2 Sorbent 50mg, it is sieved after drying. Take particles between 60-80 mesh for experiment. The experimental samples were placed in a cylindrical quartz glass fixed-bed reactor with a length of 400 mm and an inner diameter of 10 mm. The temperature was controlled by a tube furnace, and the temperature was set at 80 °C. Use the VM-3000 mercury detector to measure the mercury concentration in real time, the initial mercury concentration is 68±1g / m 3 . The gas flow of each component is precisely controlled by a mass flow meter, and the total gas flow is 1L / min. In pure N 2 Under atmosphere, within 2h, FeS 2 The average mer...

Embodiment 2

[0047] Weigh 200 mg of activated carbon, dry it and sieve it. Take particles between 60-80 mesh for experiment. The experimental samples were placed in a cylindrical quartz glass fixed-bed reactor with a length of 400 mm and an inner diameter of 10 mm. The temperature was controlled by a tube furnace, and the temperature was set at 80 °C. Use the VM-3000 mercury detector to measure the mercury concentration in real time, the initial mercury concentration is 68±1μg / m 3 . The gas flow of each component is precisely controlled by a mass flow meter, and the total gas flow is 1L / min. In pure N 2 Under the atmosphere, after long-term mercury removal, when the mercury removal efficiency drops to 0%, the mercury adsorption amount is 0.02-0.25mg / g.

Embodiment 3

[0049] 1mol / L of (NH 4 ) 2 S solution was dropped into 1mol / L CuCl 2 In the solution, stir while dripping, let it stand for a while after dripping, filter to obtain a black solid, then wash with water 3-5 times, and then vacuum dry at 160°C for 12 hours to obtain CuS adsorbent with a specific surface area of ​​28.9 m 2 / g. Weigh 5 mg of CuS adsorbent, dry it and sieve it. Take particles between 60-80 mesh for experiment. The experimental samples were placed in a cylindrical quartz glass fixed-bed reactor with a length of 400 mm and an inner diameter of 10 mm. The temperature was controlled by a tube furnace, and the temperature was set at 125 °C. Use the VM-3000 mercury detector to measure the mercury concentration in real time, the initial mercury concentration is 68±1μg / m 3 . The gas flow of each component is precisely controlled by a mass flow meter, and the total gas flow is 1L / min. In pure N 2 Under the atmosphere, the average mercury removal efficiency of CuS wa...

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Abstract

The invention discloses a method for synergistically removing Hg in flue gas 0 and Hg in waste liquid 2+ Methods. In this method, metal sulfide is used as mercury removal adsorbent, and the adsorbent is sprayed into the flue before the dry dust removal device, and the adsorbent is in contact with the flue gas, thereby adsorbing and removing Hg in the flue gas 0 ; The adsorbent is sprayed into the flue before the wet desulfurization device, and the adsorbent is in contact with the flue gas, thereby adsorbing and removing Hg in the flue gas 0 , the adsorbent enters the desulfurization slurry, and the Hg in the slurry is adsorbed and removed 2+ ; The adsorbent is sprayed into the flue before the wet dust removal device / mist removal device, and the adsorbent is in contact with the flue gas, thereby adsorbing and removing Hg in the flue gas 0 , the adsorbent enters the dedusting liquid, and adsorbs and removes Hg in the dedusting liquid 2+ . The inventive method has very high Hg 0 and Hg 2+ adsorption efficiency. The invention has the advantages of simplicity, low investment, no secondary pollution, etc., and has broad market application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and purification, and specifically relates to a method for synergistically removing Hg from flue gas 0 and Hg in waste liquid 2+ Methods. Background technique [0002] Mercury is a smoke pollutant that can have serious effects on people's nervous system. Mercury is volatile, mobile, and bioaccumulative. Mercury emitted into the atmosphere by humans can travel long distances with the air and return to the ground through dry and wet deposition, causing pollution to soil and water. Mercury is bioaccumulative and can be enriched in the food chain, seriously endangering people's health. According to the report of the United Nations Environmental Protection Agency, it is estimated that more than 1 / 5 of mercury emissions are caused by coal combustion, and among them, coal-fired power plants are considered to be the largest source of man-made mercury emissions in the world. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/64B01D53/83C02F1/62
CPCB01D53/64B01D53/83B01D2258/0283C02F1/62
Inventor 李海龙朱文炳杨泽群
Owner CENT SOUTH UNIV
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