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Preparation method of pellets containing SCR waste catalysts

A technology of SCR catalyst and waste catalyst is applied in the field of pellet preparation containing waste SCR catalyst, which can solve the problems of limited emission reduction efficiency of sintering flue gas pollutants and the like

Active Publication Date: 2021-05-11
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the technical problem of relatively limited emission reduction efficiency of sintering flue gas pollutants in the prior art, and provides a method for preparing pellets containing spent SCR catalysts. The pellets prepared by the method can form porous structure pellets containing ammonia inhibitors inside, which can properly delay the heating of the ammonia inhibitors, make the decomposition time the same as the pollutant generation time in the sintering process, and improve the emission reduction efficiency

Method used

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  • Preparation method of pellets containing SCR waste catalysts
  • Preparation method of pellets containing SCR waste catalysts
  • Preparation method of pellets containing SCR waste catalysts

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Embodiment 1

[0037] Such as figure 1 As shown, a method for preparing pellets containing spent SCR catalysts in this embodiment first prepares the inner layer pellets 100, and then continues to make pellets outside the inner layer pellets 100 to grow the pellets to obtain the outer layer pellets pellet 200, and then prepare a catalyst layer 300 outside the outer pellet 200, and finally make a multi-layer pellet; the inner pellet 100 is added with ammonia inhibitor and inner pelletizing material, and the ammonia inhibitor is heated Decomposition can release ammonia gas; a pore-forming agent and an outer layer pelletizing material are added to the outer layer pellets 200 or part of the outer layer pellets 200, and the pore-forming agent makes the outer layer pellets 200 form holes during the sintering process; The catalyst layer 300 includes SCR catalyst and vanadium-titanium blast furnace slag. In this embodiment, the thickness of the catalyst layer 300 is 2 mm, and the mass ratio of the SC...

Embodiment 2

[0063] The preparation method and sintering emission reduction method of the multi-layer pellets of this embodiment are basically the same as that of Example 1, except that the thickness of the catalyst layer 300 in Example 1 of this embodiment is maintained at 1mm, and the detection of SO 2 , NO X and the concentration of dioxins are recorded in Table 4, and the desulfurization and denitrification rate and the emission reduction efficiency of dioxins are calculated.

Embodiment 3

[0065] The preparation method and sintering emission reduction method of the multi-layer pellets of this embodiment are basically the same as in Example 1, the difference is that in this embodiment, the thickness of the catalyst layer 300 in Example 1 is maintained at 3 mm, and the detection of SO 2 , NO X and the concentration of dioxins are recorded in Table 4, and the desulfurization and denitrification rate and the emission reduction efficiency of dioxins are calculated.

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Abstract

The invention discloses a preparation method of pellets containing SCR waste catalysts, and belongs to the technical field of pollutant emission reduction in the sintering process. The preparation method comprises the following steps that firstly, inner-layer pellets are prepared, then continuous pelletizing is performed outside the inner-layer pellets to grow the pellets to obtain outer-layer pellets, catalyst layers are prepared outside the outer-layer pellets, and multi-layer pellets are finally prepared; ammonia inhibitors and inner-layer pelletizing materials are added into the inner-layer pellets, and the ammonia inhibitors can release ammonia gas after being heated and decomposed; pore-forming agents and outer-layer pelletizing materials are added into the outer-layer pellets or part of the outer-layer pellets, and pores are formed in the outer-layer pellets in the sintering process through the pore-forming agents. The pore-forming agents such as ammonium bicarbonate in the multi-layer pellets are heated and decomposed to generate the pores, so that decomposition of the ammonia inhibitors such as urea and release of NH3 are delayed, the emission window period of the ammonia inhibitors and the emission window period of NOX are consistent, NOX emission is reduced, and synergistic emission reduction of SO2, NOX and dioxin is achieved in a breakthrough mode under the action of the catalysts.

Description

technical field [0001] The invention relates to the technical field of pollutant emission reduction in the sintering process, and more specifically relates to a method for preparing pellets containing SCR waste catalyst. Background technique [0002] The iron and steel industry is the main pollutant emission source, and its environmental pollution problem has been paid more and more attention by the national environmental protection department. In 2019, my country's Ministry of Ecology and Environment and other five ministries and commissions jointly issued the "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Iron and Steel Industry", requiring iron and steel enterprises across the country to significantly reduce pollutant emission levels, and set the emission standards for sintering / pelletizing process pollutants as particulate matter, SO 2 , NO X And the emission limit of dioxin is 10mg / m 3 、35mg / m 3 , 50mg / m 3 , 0.1-0.2ng-TEQ / m 3 . The policy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B1/16
CPCC22B1/2406C22B1/248C22B1/16
Inventor 王毅播龙红明杨涛余正伟钱立新丁龙罗云飞汪名赫刘爽孟庆民春铁军丁成义雷杰
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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