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Method for reducing emission of sintering flue gas pollutants by utilizing SCR-containing waste catalyst pellets

A technology of SCR catalyst and waste catalyst, which is applied in the field of reducing sintering flue gas pollutants by using SCR waste catalyst pellets, can solve the problems of reduced emission reduction efficiency, slow temperature rise, etc., to reduce the burden of emission reduction, delay decomposition, and ensure The effect of normal production

Active Publication Date: 2021-04-30
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 problem that the ammonia inhibitors in the prior art are mainly added to the sintered material through direct paving or direct mixing and granulation, and the problem of rapid decomposition due to the solid heat transfer between the ammonia inhibitors and the sintered material , will lead to the decomposition of ammonia inhibitors to generate NH 3 and the SO produced by sintering 2 , NO X It is inconsistent with the dioxin emission window period, and the emission reduction efficiency is reduced; it provides a method for reducing the emission of sintering flue gas pollutants by using SCR-containing waste catalyst pellets. The porous structure of pellets makes the ammonia inhibitor slowly heat up, and the generated NH 3 with SO 2 , NO X Consistent with the dioxin emission window period to improve emission reduction efficiency

Method used

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  • Method for reducing emission of sintering flue gas pollutants by utilizing SCR-containing waste catalyst pellets
  • Method for reducing emission of sintering flue gas pollutants by utilizing SCR-containing waste catalyst pellets
  • Method for reducing emission of sintering flue gas pollutants by utilizing SCR-containing waste catalyst pellets

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Embodiment 1

[0043]Such asfigure 1 As shown, a method of adding a sintering ball in the preparation of the SCR discarded catalyst ball to reduce the flue gas contaminant, the sintered raw material is added, and the sintered ball is sequentially provided from the inner layer. The ball group 100, outer ball mass 200 and catalyst layer 300; the inner layer ball group 100 includes ammonia inhibitors, ammonia inhibitors are thermally decomposed to release ammonia; the outer ball group 200 includes a hole The pore agent causes the outer layer ball group 200 in the outer layer ball group 200 in the sintering process; the catalyst layer 300 includes a SCR catalyst and a vanadium titanium blast residue. In the present embodiment, the catalyst layer 300 has a thickness of 2 mm, catalyst layer 300 The SCR catalyst and vanadium titanium blast furnace residue is 1: 1; the SCR catalyst comprises V2O5 and TiO2; the vanadium titanium blast furnace residue comprises CaO, SiO2, and V elements, Ti elements; the in...

Embodiment 2

[0069]The sintered ball of the present embodiment and the sintering emission reduction method are basically the same as that of the first embodiment, and the difference is that the catalyst layer 300 thickness of the present embodiment is maintained at 1 mm, detecting SO2NOXAnd the production concentration of dioxins, records in Table 4, and calculate the desulfurized denitration rate, and the emission reduction efficiency of dioxin.

Embodiment 3

[0071]The sintered ball of the present embodiment and the sintering reduction method are basically the same as that of the first embodiment, and the difference is that the catalyst layer 300 thickness of the present embodiment is maintained at 3 mm, detecting SO2NOXAnd the production concentration of dioxins, records in Table 4, and calculate the desulfurized denitration rate, and the emission reduction efficiency of dioxin.

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Abstract

The invention discloses a method for reducing emission of sintering flue gas pollutants by utilizing SCR-containing waste catalyst pellets, and belongs to the technical field of pollutant emission reduction in the sintering process. In the preparation process of a sintering raw material, a sintering pellet is added, and the sintering pellet is sequentially provided with an inner-layer pellet, an outer-layer pellet and a catalyst layer from inside to outside. An ammonia inhibitor is included in the inner-layer pellet, and the ammonia inhibitor can release ammonia gas after being heated and decomposed. A pore-forming agent is included in the outer-layer pellet, and the pore-forming agent enables pores to be formed in the outer-layer pellet in the sintering process. The catalyst layer comprises an SCR catalyst and vanadium-titanium blast furnace slag. The pore-forming agent in the sintering pellet is heated and decomposed to generate pores, and therefore decomposition of the ammonia inhibitor such as urea and release of NH3 are delayed, the ammonia inhibitor is consistent with the NOX emission window period, NOX emission is reduced, and cooperative emission reduction of SO2, NOX and dioxin is realized in a breakthrough manner under the action of the catalyst.

Description

Technical field[0001]The present invention relates to the field of contaminant emission reduction in the sintering process, and more particularly to a method of damaging the flue gas contaminant with SCR waste catalyst balls.Background technique[0002]The sintering / ball process is an important pollution link in the steel industry. The existing flue gas pollutant emission reduction technology generally adopts end governance. Although the emission reduction effect is better, the required investment is large, and it may generate secondary pollution, and it is difficult Implement multi-pollutant coordination emission reduction.[0003]Announcement of Dragon Ming, Anhui University of Technology, etc. In proposing urea in a particular material layer height section in sinter mixing, rationally utilizing the thermodynamics and kinetics conditions of the sintering process, establishing SO2NOXAnd the emission barrier of the dioxin, the reaction product is neither entering the sintering ore, no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/243
CPCC22B1/16C22B1/2406C22B1/243
Inventor 龙红明杨涛王毅瑶钱立新余正伟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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