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High-activity mercury removal adsorbent and preparation method thereof

An adsorbent and high-activity technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of high energy consumption and waste gas treatment, and achieve the goal of increasing reaction rate, reducing preparation cost, and mild conditions Effect

Active Publication Date: 2021-04-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problems of co-pyrolysis are: the temperature of the co-pyrolysis reaction is 500-900°C, the energy consumption is large, and the waste gas generated during the co-pyrolysis process needs to be treated

Method used

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  • High-activity mercury removal adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] figure 1 It is a diagram of the preparation device of the highly active mercury-removing adsorbent used in the preferred embodiment of the present invention. The elemental sulfur is heated at 500°C to generate sulfur-containing vapor. The volume concentration of elemental sulfur in the sulfur-containing vapor is 10%, and the balance gas is nitrogen . The sulfur-containing steam is passed into the quartz reactor 3 through the sulfur-containing steam inlet 1 at a flow rate of 100 ml / min, and the adsorbent carrier 2 is placed in the quartz reactor 3 . When the sulfur-containing vapor fills the quartz reactor 3, turn on the plasma power supply 4, adjust the output voltage of the plasma generator to 30kV, and the frequency to 15kHz (read by the oscilloscope 5). After reacting at 26° C. for 2 minutes, a highly active mercury-removing adsorbent can be obtained in the quartz reactor 3 .

[0035] The obtained highly active mercury-removing adsorbent was placed on a fixed-bed b...

Embodiment 2

[0037] Heating elemental sulfur at 600°C generates sulfur-containing vapor, and the volume concentration of elemental sulfur in the sulfur-containing vapor is 100%. The sulfur-containing vapor is passed into the quartz reactor 3 through the sulfur-containing vapor inlet 1 at a flow rate of 1 ml / min, and the adsorbent carrier 2 is placed in the quartz reactor 3 . When the sulfur-containing vapor fills the quartz reactor 3, turn on the plasma power supply 4, adjust the output voltage of the plasma generator to 40kV, and the frequency to 20kHz (read by the oscilloscope 5). After reacting at 23° C. for 3 minutes, a highly active mercury-removing adsorbent can be obtained in the quartz reactor 3 .

[0038] Take 10 mg of highly active mercury removal adsorbent and place it on a fixed bed bench for mercury adsorption test. The initial mercury concentration in the adsorption test was 90 μg / m 3 , the adsorption temperature is 110℃, the carrier gas (N 2 ) The flow rate is 1L / min. Th...

Embodiment 3

[0040] Heating elemental sulfur at 550°C generates sulfur-containing vapor, and the volume concentration of elemental sulfur in the sulfur-containing vapor is 20%. The sulfur-containing steam is passed into the quartz reactor 3 through the sulfur-containing steam inlet 1 at a flow rate of 200ml / min, and the adsorbent carrier 2 is placed in the quartz reactor 3 . When the sulfur-containing vapor fills the quartz reactor 3, turn on the plasma power supply 4, adjust the output voltage of the plasma generator to 35kV, and the frequency to 10kHz (read by the oscilloscope 5). After reacting at 27° C. for 5 minutes, a highly active mercury-removing adsorbent can be obtained in the quartz reactor 3 .

[0041] Take 10 mg of highly active mercury removal adsorbent and place it on a fixed bed bench for mercury adsorption test. The initial mercury concentration in the adsorption test was 90 μg / m 3 , the adsorption temperature is 110℃, the carrier gas (N 2 ) The flow rate is 1L / min. Th...

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Abstract

The invention belongs to the field of coal-fired pollutant control, and particularly discloses a high-activity sulfur-loaded mercury removal adsorbent and a preparation method thereof. The method specifically comprises the steps: activating sulfur-containing steam by utilizing plasmas to generate high-energy active particles, and breaking S-S bonds in gaseous elemental sulfur molecules by virtue of the active particles, so as to prepare the high-activity mercury removal adsorbent. The problems of low elemental sulfur utilization rate and low mercury removal efficiency due to the fact that themain component in common sulfur is cyclic S8 molecules and the reaction free energy barrier between the cyclic S8 molecules and Hg<0> is relatively high are considered. Therefore, according to the invention, the sulfur-containing steam is activated by adopting the plasmas, so that the S-S bonds in the gaseous S8 molecules are broken, S6, S7 and S9 molecules with relatively low chemical reaction energy barriers and branched S8 molecules are generated, the rate of reaction with Hg<0> is effectively increased, and the high-activity mercury removal adsorbent is prepared. The method has the advantages of simple preparation process and mild conditions, and can effectively reduce the preparation cost.

Description

technical field [0001] The invention belongs to the field of coal-burning pollutant control, and more specifically relates to a highly active sulfur-loaded mercury-removing adsorbent and a preparation method thereof. Background technique [0002] Mercury, as a toxic heavy metal element, is rated by the World Health Organization as one of the 10 most harmful chemicals to public health. It will cause great damage to the reproductive system, circulatory system, digestive system and nervous system of the human body. In my country's mercury emission inventory, coal-fired power plants are the main sources of anthropogenic mercury emissions, and their emission characteristics are: low mercury concentration, large total amount, and serious cumulative effect. [0003] Mercury in coal-fired flue gas mainly exists in the following three forms: elemental mercury in the gas phase (Hg 0 ), oxidized mercury in gas phase (Hg 2+ ) and particulate mercury (Hg P ). Among them, Hg 2+ and ...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30B01D53/02
CPCB01J20/02B01J20/30B01D53/02B01D2257/602B01D2258/0283B01D2253/10B01D2253/25
Inventor 罗光前孙瑞泽邹仁杰方灿余鸣宇李显姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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