Multilayer composite pellet for inhibiting SO2 and NOx in sintering process

A sintering process and multi-layer composite technology, which is applied to the separation of dispersed particles, air quality improvement, chemical instruments and methods, etc., can solve the problems of limited emission reduction efficiency of sintering flue gas pollutants, and achieve high flue gas emission reduction efficiency, Reduce the burden of emission reduction and ensure the effect of normal production

Pending Publication Date: 2021-03-02
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 the addition of ammonia inhibitors in the sintering process and the relatively limited emission reduction efficiency of sintering flue gas pollutants in the prior art, and provides a multi-layer composite pellet for suppressing SO2 and NO

Method used

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  • Multilayer composite pellet for inhibiting SO2 and NOx in sintering process
  • Multilayer composite pellet for inhibiting SO2 and NOx in sintering process
  • Multilayer composite pellet for inhibiting SO2 and NOx in sintering process

Examples

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Embodiment 1

[0031] like figure 1As shown, a multi-layer composite pellet for suppressing SO2 and NOx in the sintering process of this embodiment includes an inner layer pellet 100 and an outer layer pellet 200 arranged outside the inner layer pellet 100; the inner layer pellet 100 includes an ammonia inhibitor and an inner layer pelletizing material, the ammonia inhibitor can be decomposed by heat to release ammonia gas; the outer layer pellet 200 includes a pore-forming agent and an outer layer pelletizing material, the pore-forming material During the sintering process, the outer layer pellets 200 form pores; the particle size of the outer layer pelletizing material reaches -0.149mm, and the mass percentage content of the particle size is ≥95%; the particle size of the inner layer pelletizing material reaches -0.074mm particle size mass percentage The content is ≥95%; the particle size of the inner layer pellet 100 is 3-5mm; the moisture content of the multi-layer composite pellet is 8....

Embodiment 2

[0056] The multi-layer composite pellets and the sintering emission reduction method in this embodiment are basically the same as those in Embodiment 1, except that the ratio of urea to ammonium bicarbonate in this embodiment is 4:1, and the SO 2 , NO X and the generation concentration of dioxin, recorded in Table 4, and calculated the desulfurization and denitrification rate and the emission reduction efficiency of dioxin.

Embodiment 3

[0058] The multi-layer composite pellets and the sintering emission reduction method in this example are basically the same as those in Example 1, except that in this example, the ratio of urea to ammonium bicarbonate is 1:1, and the SO 2 , NO X and the generation concentration of dioxin, recorded in Table 4, and calculated the desulfurization and denitrification rate and the emission reduction efficiency of dioxin.

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Abstract

The invention discloses a multilayer composite pellet for inhibiting SO2 and NOx in a sintering process, and belongs to the technical field of pollutant emission reduction in the sintering process. The pellet comprises an inner-layer pellet and an outer-layer pellet arranged outside the inner-layer pellet. The inner-layer pellet comprises an ammonia inhibitor and an inner-layer pelletizing material, and the ammonia inhibitor can release ammonia gases after being heated and decomposed. The outer-layer pellet comprises a pore-forming agent and an outer-layer pelletizing material, and the pore-forming agent enables pores to be formed in the outer-layer pellet in the sintering process. The pore-forming agent such as ammonium bicarbonate in the multi-layer composite pellet is heated and decomposed to generate pores, a porous structure effectively delays the decomposition of the ammonia inhibitor such as urea and the release of NH3, so that the ammonia inhibitor is consistent with the NOX emission window period, the NOX emission is reduced, and the cooperative emission reduction of SO2, NOX and dioxin is achieved in a breakthrough manner.

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 multilayer composite pellet for suppressing SO2 and NOx in the sintering process. Background technique [0002] With the increasingly serious environmental problems and the gradual enhancement of people's awareness of environmental protection, the iron and steel industry, as a major source of pollutant emissions, has received more and more attention from 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,...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/24B01D53/86B01D53/60
CPCC22B1/16C22B1/2406B01D53/8637B01D2251/2062Y02A50/20
Inventor 龙红明钱立新王毅璠杨涛丁龙汪名赫孟庆民余正伟春铁军雷杰王宏涛丁成义
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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