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A method for combined removal of various pollutants in sintering flue gas by using magnetically stabilized bed

A technology for sintering flue gas and combined removal, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of high cost of pollutant removal step by step, increase of effective specific surface area of ​​catalyst, high cost of catalyst, etc., to achieve Improve the effective specific surface area, reduce the flow rate, and reduce the bed resistance

Active Publication Date: 2020-07-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for jointly removing various pollutants in sintering flue gas by using a magnetically stabilized bed, and realizes the self-assembly process of the catalyst in the magnetically stabilized bed, thereby achieving Increase the effective specific surface area of ​​the catalyst, thereby solving the problems of high catalyst cost and high cost of pollutant removal step by step

Method used

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  • A method for combined removal of various pollutants in sintering flue gas by using magnetically stabilized bed
  • A method for combined removal of various pollutants in sintering flue gas by using magnetically stabilized bed

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Step 1: Heat the simulated sintering flue gas temperature to 300°C for further experiments.

[0031] Step 2: Put the sintered ore with a particle size range of 0.3-0.45mm into the magnetically stabilized bed, and keep the bed height at 6cm, turn on the magnetic field generator, and then pass the sintering flue gas into the magnetically stabilized bed. Inject NH 3 and guaranteed NH 3 : NO molar ratio is 1.

[0032] The composition of simulated flue gas is set as follows: NO concentration is 400ppm, SO 2 Concentration is 1000ppm, dust concentration is 5g / m 3 , the simulated flue gas is mixed after being controlled by a mass flow meter, and the NO and SO in the flue gas 2 The components were measured by the PG-350 flue gas analyzer produced by Japan Horiba Company, the Hg concentration was measured by VM3000 in real time, and the dust removal efficiency was collected and tested by the filter cartridge, and the test time was 2 hours. Its dust removal efficiency is 91%,...

Embodiment 2

[0034] Step 1: Heat the simulated sintering flue gas temperature to 350°C for further experiments.

[0035] Step 2: Put sintered ore with a particle size range of 0.1-0.3mm into the magnetically stabilized bed, and keep the bed height at 10cm, turn on the magnetic field generator, and then pass the sintering flue gas into the magnetically stabilized bed. Inject NH 3 and guaranteed NH 3 : NO molar ratio is 2.

[0036] The composition of simulated flue gas is set as follows: NO concentration is 400ppm, SO 2 Concentration is 1000ppm, dust concentration is 5g / m 3 , the simulated flue gas is mixed after being controlled by a mass flow meter, and the NO and SO in the flue gas 2 The components were measured by the PG-350 flue gas analyzer produced by Japan Horiba Company, the Hg concentration was measured by VM3000 in real time, and the dust removal efficiency was collected and tested by the filter cartridge, and the test time was 2 hours. The dust removal efficiency is 99%, the...

Embodiment 3

[0038] Step 1: Heat the simulated sintering flue gas temperature to 250°C for further experiments.

[0039] Step 2: Put the sintered ore with a particle size range of 0.3-0.45mm into the magnetically stabilized bed, and keep the bed height at 8cm, turn on the magnetic field generator, and then pass the sintering flue gas into the magnetically stabilized bed. Inject NH 3 and guaranteed NH 3 : NO molar ratio is 1.5.

[0040] The composition of simulated flue gas is set as follows: NO concentration is 400ppm, SO 2 Concentration is 1000ppm, dust concentration is 5g / m 3 , the simulated flue gas is mixed after being controlled by a mass flow meter, and the NO and SO in the flue gas 2 The components were measured by the PG-350 flue gas analyzer produced by Japan Horiba Company, the Hg concentration was measured by VM3000 in real time, and the dust removal efficiency was collected and tested by the filter cartridge, and the test time was 2 hours. Its dust removal efficiency is 94...

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Abstract

The invention belongs to the field of sintering flue gas pollutant control, and discloses a method for jointly removing multiple pollutants in sintering flue gas by utilizing a magnetically stabilized bed. The method is as follows: using a magnetically stabilized bed as a reactor, existing iron-containing materials in the sintering plant as bed materials, and passing the sintering flue gas into the magnetically stabilized bed to achieve joint removal of pollutants. In this process, the main components The sintered fly ash, which is iron oxide, will be captured by the bed material. The particle size of the fly ash is smaller than that of the sinter and the specific surface area is higher than that of iron-containing materials. Therefore, the captured fly ash will form a huge specific surface area on the surface of the bed material particles. The "eggshell" surface layer realizes the self-assembly of the catalyst; continue to add reducing gas to selectively catalytically reduce NO in the sintering flue gas. x , while promoting SO 2 and catalytic oxidation of Hg, ultimately achieving particulate matter, NO x ,SO 2 Combined removal of Hg. This method has the advantages of zero cost of raw materials, zero cost of catalyst preparation process, and joint removal of multiple pollutants.

Description

technical field [0001] The invention belongs to the field of sintering flue gas pollutant control, and more specifically relates to a method for jointly removing multiple pollutants in sintering flue gas by using a magnetically stabilized bed. Background technique [0002] Sintering is an important link in the steel production process, but a large amount of pollutants will be generated during the sintering process, such as particulate matter, SO 2 , NO x , heavy metals, dioxins, etc. "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standards (GB28662-2012)" stipulates that since January 1, 2015, the pollutant emission limits of existing enterprises are respectively 50 mg / m of particulate matter 3 , SO 2 200mg / m 3 、NOx 300mg / m 3 , much higher than the previous standard. my country also joined the "Minamata Convention" on global mercury emission reduction in 2013, and assumed the international obligation of mercury emission reduction. The country has issu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/60B01D53/64B01J23/745
CPCB01D53/60B01D53/64B01D53/86B01D53/8637B01D53/8665B01J23/745B01D2258/0283B01D2251/2062B01D2251/204B01D2251/208B01D2251/202B01D2255/20738B01D2255/707B01J35/393B01J35/397Y02A50/20
Inventor 罗光前许洋周梦丽胡靖远甘蓉丽朱海露梅瑞冬姚洪
Owner HUAZHONG UNIV OF SCI & TECH