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Application of composite bed low-temperature selected catalytic reduction (SCR) denitrification catalyst

A technology of denitrification catalyst and composite bed, which is applied in the application field of composite bed low-temperature SCR denitrification catalyst, can solve the problems of limitation, SCR reaction activity due to carrier pore structure, etc., and achieve huge equipment, reduce construction and operation costs, and low cost Effect

Active Publication Date: 2015-07-01
SHANGHAI HUAMING HI TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the amount of reducing agent in the existing carbon-supported urea catalyst is limited by the carrier pore structure and SCR reaction activity, and provide a composite bed low-temperature SCR denitrification catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh the pitch-based spherical activated carbon (S mic =1295m 2 / g,V mic =0.52cm 3 / g) 0.5g as NO catalytic oxidation catalyst; using equal volume impregnation method, 0.5g of carbon airgel (S BET =1025m 2 / g,V t =2.69cm 3 / g), soaked in urea aqueous solution (the concentration of urea is 2.7mol / L) for 24h, then dried in vacuum at 60℃ for 24h, the prepared catalyst was used as NO x Catalytic reduction catalyst, wherein the loaded amount of urea is 50%.

[0021] The above-mentioned catalysts are loaded in the MD bed and DN bed of the fixed bed reactor in sequence to form a composite double-bed denitrification process, and the temperature is raised to 30°C for ventilation. The simulated flue gas composition is: 500ppmv NO, 20vol%O 2 , N 2 As balance gas, normal pressure operation, space velocity is 6000h -1 . The test results are: the NO oxidation rate in the first MD bed is 90%, and the NO oxidation rate in the second DN bed x The steady-state removal rate wa...

Embodiment 2

[0023] Weigh polyacrylonitrile-based activated carbon fiber (S mic =1008m 2 / g,V mic =0.42cm 3 / g) 0.5g as NO catalytic oxidation catalyst; using equal volume impregnation method, 0.5g of resin-based spherical activated carbon (S BET =619m 2 / g,V t =1.48cm 3 / g), soaked in urea aqueous solution (the concentration of urea is 1.47mol / L) for 12h, then dried in vacuum at 70℃ for 15h, the prepared catalyst was used as NO x Catalytic reduction catalyst, wherein the loaded amount of urea is 30%.

[0024] The above-mentioned catalysts are loaded in the MD bed and DN bed of the fixed bed reactor in sequence to form a composite double-bed denitrification process, and the temperature is raised to 35°C for ventilation. The simulated flue gas composition is: 500ppmv NO, 20vol%O 2 , N 2 As balance gas, normal pressure operation, space velocity is 2000h -1 . The test results are: the NO oxidation rate in the first MD bed is 92%, and the NO oxidation rate in the second DN bed x The ...

Embodiment 3

[0026] Activated coke (Shanxi Xinhua Chemical Co., Ltd.) with a particle size of 0.2-0.5 mm was activated with steam at 850 °C for 60 minutes (S mic =366m 2 / g,V mic =0.15cm 3 / g), and weighed 0.6g as the NO catalytic oxidation catalyst; adopting the excessive impregnation method, weighed 0.5g pitch-based spherical activated carbon (S BET =1141m 2 / g,V t =0.62cm 3 / g), soaked in urea aqueous solution (the concentration of urea is 0.57mol / L) for 8h, then dried in vacuum at 50℃ for 18h, the prepared catalyst was used as NO x Catalytic reduction catalyst, wherein the loading amount of urea is 10%.

[0027] The above-mentioned catalysts are loaded in the MD bed and DN bed of the fixed bed reactor in sequence to form a composite double-bed denitrification process, and the temperature is raised to 30°C for ventilation. The simulated flue gas composition is: 500ppmv NO, 20vol%O 2 , N 2 As balance gas, normal pressure operation, space velocity is 10000h -1 . The test results...

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Abstract

The invention relates to an application of a composite bed low-temperature selected catalytic reduction (SCR) denitrification catalyst. In the airflow direction of flue gas, a NO catalytic oxidation bed and a NOx catalytic reduction bed are sequentially arranged inside a fixed bed reactor; the NO catalytic oxidation bed adopts microporous activated carbon or a carbonaceous porous material of activated carbon fiber as a catalyst, and the NOx catalytic reduction bed adopts a urine-loaded carbonaceous porous material or a molecular sieve as a catalyst. Compared with the prior art, the denitrification catalyst disclosed by the invention has the characteristics of being ammonium-free, green and environment-friendly, free from secondary pollution, cheap and easily available in carbonaceous porous material and molecular sieve carriers, being reusable after recovering the loaded urine and the like; by virtue of a flue gas denitrification process, the loading amount of a reducer is greatly improved, the service life of the catalyst is prolonged, and the construction and operation costs of denitrification are greatly reduced; and the denitrification catalyst has significant advantages of being free from catalyst poisoning, high in denitrification efficiency, wide in denitrification concentration range and the like.

Description

technical field [0001] The invention belongs to the field of denitration, and in particular relates to the application of a composite bed low-temperature SCR denitration catalyst. Background technique [0002] With the increase of human production activities and social activities, especially since the industrial revolution, due to the burning of a large amount of fossil fuels, the emission of industrial waste gas and vehicle exhaust, the quality of the atmospheric environment is deteriorating day by day. NO in exhaust gas x As one of the main pollutants in the atmosphere, it can cause a series of environmental problems such as acid rain, photochemical smog, ozone layer destruction and greenhouse effect, and pose a huge threat to human health and the ecological environment. Atmospheric environmental problems caused by a large amount of nitrogen oxide emissions have seriously restricted the sustainable development of society and economy. Countries have successively formulated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01J31/02B01J37/02
Inventor 乔文明李军吴秋芳马新胜王际童龙东辉凌立成
Owner SHANGHAI HUAMING HI TECH GRP
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