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A mercury removal method based on online activation of porous carbon

A porous carbon and mercury removal technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of high cost of activated carbon injection technology, complex operation process requirements, low mercury adsorption efficiency, etc. The method is simple and reliable, Ease of use and high mercury removal efficiency

Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, further studies have shown that the above-mentioned existing schemes still have the following defects or deficiencies: first, the actual test shows that the activated carbon treated by the above method has a low adsorption efficiency for mercury, and its overall performance still needs to be further improved; secondly, in actual In the industry, it is often necessary to inject a large amount of such activated carbon to meet the corresponding emission standards, so the cost of activated carbon injection technology is relatively high
In particular, the above-mentioned mercury removal route requires complex operating procedures, high cost, and often uses highly corrosive active agents, which are likely to cause adverse effects on the environment

Method used

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  • A mercury removal method based on online activation of porous carbon
  • A mercury removal method based on online activation of porous carbon
  • A mercury removal method based on online activation of porous carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Perform a hydrothermal reaction of lignin at 180°C for 10 hours to obtain a carbonized precursor; then, carbonize the precursor at 600°C under an inert atmosphere for 0.5 hours to obtain original carbon; then, use it at 900°C CO 2 Carrying out a 2-hour pore expansion activation treatment on the raw carbon to obtain a porous carbon product;

[0038] (2) The obtained porous carbon product is sprayed into the flue, so that the porous carbon and 1% O 2 and 500ppm SO 2 smoke mixture;

[0039] (3) The porous carbon product was treated with low-temperature plasma at 20kV working voltage for 1 second, thereby online activating the porous carbon and simultaneously removing mercury, and the mercury removal efficiency PC-1 was obtained.

Embodiment 2

[0041] (1) Perform a hydrothermal reaction of sucrose at 200°C for 12 hours to obtain a carbonized precursor; then, carbonize the precursor at 600°C for 2 hours under an inert atmosphere to obtain original carbon; then, use CO at 900°C 2 Carrying out a 4-hour pore-expanding activation treatment on the raw carbon to obtain a porous carbon product;

[0042] (2) The obtained porous carbon product is sprayed into the flue, so that the porous carbon and 20% O 2 and 5000ppm SO 2 smoke mixture;

[0043] (3) The porous carbon product was treated with low temperature plasma at 20kV working voltage for 180 seconds, thereby online activating the porous carbon and simultaneously removing mercury to obtain the mercury removal efficiency PC-2.

Embodiment 3

[0045] (1) The starch was subjected to a hydrothermal reaction at 180°C for 10 hours to obtain a carbonized precursor; then, the precursor was carbonized at 550°C for 2 hours under an inert atmosphere to obtain the original carbon; then, at 950°C using CO 2 Carrying out a 2-hour pore expansion activation treatment on the raw carbon to obtain a porous carbon product;

[0046] (2) The obtained porous carbon product is sprayed into the flue, so that the porous carbon and 8% O 2 and 100ppm SO 2 smoke mixture;

[0047] (3) The porous carbon product was treated for 300 seconds with a low-temperature plasma at a working voltage of 60kV, thereby activating the porous carbon online and removing mercury simultaneously, and the mercury removal efficiency PC-3 was obtained.

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Abstract

The invention belongs to the technical field of flue gas pollutant control and discloses a demercuration method based on on-line activation of porous carbon. The demercuration method comprises the following steps: preparing porous carbon by using a hydrothermal method together with CO2 activation; spraying the porous carbon into a flue to be mixed with a flue gas; treating the porous carbon in theflue gas with low-temperature plasma so as to convert O2 and SO2 in the flue gas into free radicals with high activity through plasmization, and forming adsorption active positions of mercury on thesurface of the porous carbon rapidly, thereby achieving efficient removal of mercury. By adopting the demercuration method, the porous carbon can be activated on line by using pollutant components inthe flue gas, efficient removal of the mercury can be achieved synchronously, and the method is simple and reliable, free of secondary pollutant, low in cost and easy in industrial application.

Description

technical field [0001] The invention belongs to the related technical field of flue gas pollutant control, and more specifically relates to a mercury removal method based on online activation of porous carbon. Background technique [0002] Mercury is a toxic heavy metal, and its harm to human body and environment deserves special attention. At present, mercury emissions are involved in many fields, especially in coal-fired power plants. Specifically, mercury in coal combustion flue gas includes elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ) and particulate mercury (Hg p ). where Hg 2+ It is easily soluble in water and can be efficiently removed by existing wet desulfurization devices; Hg p Can be removed by the existing dust removal device; but for Hg 0 However, due to its high volatility, low water solubility and chemical inertness, it is difficult to be removed by existing air pollution control equipment. Therefore, Hg 0 The capture of mercury is one of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J20/34B01D53/02
CPCB01D53/02B01D2257/302B01D2257/602B01D2258/0283B01J20/20B01J20/28054B01J20/3078B01J20/3441B01J2220/4825B01J2220/4837
Inventor 刘晶沈锋华董昱辰吴大卫张振
Owner HUAZHONG UNIV OF SCI & TECH
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