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Oxidative carbonization system and method for flue gas internal circulation

A technology of flue gas circulation and carbon oxidation, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as difficulty in effectively achieving pre-oxidation

Active Publication Date: 2019-01-11
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for high-strength coal shaped pellets, research suggests that using air directly as an oxidant is not the best choice, and it is difficult to effectively achieve the expected effect of pre-oxidation

Method used

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  • Oxidative carbonization system and method for flue gas internal circulation
  • Oxidative carbonization system and method for flue gas internal circulation
  • Oxidative carbonization system and method for flue gas internal circulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] use figure 1 The oxidative carbonization system shown is for oxidative carbonization treatment of materials, wherein the oxygen content in the oxidant is 14 vol%, the carbon dioxide content is 12 vol%, and the water vapor content is 24 vol%.

[0042] The briquette is crushed and granulated to obtain granules with a particle diameter between 6.7 mm and 8 mm.

[0043] Heat at 230°C for 3 hours in the first cylinder to oxidize the above-mentioned pellets, then send the oxide material to the second cylinder, and roast in flowing nitrogen at a temperature of 490°C for 4 hours to obtain carbonized materials.

[0044] The briquette is prepared by the following method:

[0045] (1), Xinjiang Hami coal is pulverized into pulverized coal with an average particle size of 25 μm, and sieved, wherein the content of pulverized coal with a particle size greater than 80 μm is 2.5 wt %; the content of pulverized coal with a particle size greater than 40 μm is 18 wt %;

[0046] (2), the...

Embodiment 2

[0056] The difference from Example 1 is that the oxygen content in the oxidant is 8vol%, the carbon dioxide content is 18vol%, and the water vapor content is 35vol%; meanwhile, in the first cylinder, it is heated at 290°C for 4.5h to oxidize the above-mentioned pellets Treat and then oxidize the material. All the other are with embodiment 1.

[0057] The carbonized materials were tested, and the results are shown in Table 1.

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Abstract

The invention discloses an oxidation and carbonization system for flue gas internal circulation. The system comprises an external heating oxidation furnace, an external heating carbonization furnace, a combustion device and a first flue gas circulation device. The invention further provides a method for oxidation and carbonization treatment by means of the system. Air and flue gas containing a large amount of carbon dioxide and vapor are mixed to obtain oxidant, the oxygen content in the oxidant is correspondingly reduced, a better oxidation effect can be achieved on formed granules high in strength, and accordingly the carbonization effect can be improved.

Description

technical field [0001] The invention belongs to the field of coal-based activated carbon production, and in particular relates to an oxidation carbonization system and method for flue gas internal circulation in coal-based activated carbon production. Background technique [0002] In the traditional coal-based activated carbon production process, the raw coal is subjected to carbonization and activation processes after molding and granulation to prepare activated carbon. At present, the advanced activated carbon production process often includes an oxidation process, that is, oxidation treatment is performed first before carbonization treatment. [0003] Proper oxidation treatment of carbon materials before carbonization can improve the adsorption performance and yield of activated carbon. After coal oxidation and then carbonization, the microcrystalline structure of coal is greatly changed. With the deepening of the oxidation degree, the interlayer spacing of the carboniz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/39
Inventor 许新田赵龙韩晓林王洪强张雁江鲁宗虎赵荣善
Owner CHNA ENERGY INVESTMENT CORP LTD
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