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Multilayer pellet for reducing emission of sintering smoke pollutants

A technology for sintering flue gas and pollutants, applied in the field of multi-layer pellets, can solve the problems of poor emission reduction effect and high cost of flue gas treatment, and achieve the effects of low price, high efficiency of flue gas emission reduction and reasonable technology

Pending Publication Date: 2021-02-26
ANHUI UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at adding ammonia inhibitors in the sintering material in the prior art, which will lead to SO in the sintering process 2 , NO X and dioxin and other pollutants have poor online emission reduction effect and high cost of flue gas treatment; provide a multi-layer pellet for reducing emission of sintering flue gas pollutants, the coating layer of the pellet will contain ammonia inhibitor Adding it to the sintering material can effectively slow down the NH produced by the pellets at high sintering temperature. 3 Release speed, so that it can fully react with the pollutants generated by sintering, so as to achieve the purpose of synergistic emission reduction

Method used

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  • Multilayer pellet for reducing emission of sintering smoke pollutants
  • Multilayer pellet for reducing emission of sintering smoke pollutants
  • Multilayer pellet for reducing emission of sintering smoke pollutants

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1As shown, a multi-layer pellet in this embodiment includes an inner layer pellet 100 and a wrapping layer 200; the inner layer pellet 100 includes an inner layer pelletizing material and an ammonia inhibitor, and the ammonia inhibitor Thermal decomposition can release ammonia, and the N element content in the ammonia inhibitor accounts for 0.02-0.15% of the mass of the inner pellet 100, which is 0.047% in this embodiment, and the mass ratio converted into urea is 0.1%; The wrapping layer 200 is wrapped on the outside of the inner layer pellets 100, and the wrapping layer 200 includes the outer pelletizing material; the particle size of the outer layer pelletizing material reaches -0.149mm particle size mass percentage content ≥ 95%; the inner layer pelletizing material The particle size of the material reaches -0.074mm particle size mass percentage content ≥ 95%; the particle size of the inner pellet 100 is 3-5mm; the moisture content of the pellet is 8....

Embodiment 2

[0057] The pellets and sintering emission reduction method of this embodiment are basically the same as those of Embodiment 1, except that the N element content of the ammonia inhibitor in this embodiment accounts for 0.038% of the mass of the inner pellet 100, which is converted into urea The mass ratio is 0.08%, 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

[0059] The pellets and sintering emission reduction method of this embodiment are basically the same as those of Embodiment 1, except that the N element content of the ammonia inhibitor in this embodiment accounts for 0.071% of the mass of the inner pellet 100, which is converted into urea The mass ratio is 0.15%, 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 multilayer pellet for reducing emission of sintering smoke pollutants, and belongs to the technical field of pollutant emission reduction in the sintering process. The multilayer pellet comprises an inner pellet and a wrapping layer, wherein the inner pellet comprises an inner pelletizing material and an ammonia type inhibitor, the ammonia type inhibitor can release ammonia gas after being heated and decomposed, and the content of the N element in the ammonia type inhibitor accounts for 0.02-0.15% of the mass of the inner pellet. The wrapping layer wraps the outer side of the inner pellet and comprises an outer pelletizing material. The wrapping layer outside the pellet can play a role in preventing NH3 from being released, so that the NH3 can be stably released in a centralized manner at the temperature of 600-800 DEG C, NOX can be discharged at the temperature of 650 DEG C, the discharge temperature of the NOX is consistent with the release temperature interval of NH3, and therefore, the NH3 and the NOX react with each other; and meanwhile, generation of dioxin can be inhibited in the cooling process, the cooling process is conducted until the temperature of the sintering smoke is lowered to be lower than the dioxin synthesis temperature, and the emission reduction efficiency of SO2 and dioxin is improved.

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 pellet used for reducing emission of pollutants in sintering flue gas. 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): C22B1/24C22B1/16
CPCC22B1/2406C22B1/16
Inventor 龙红明杨涛杨美洲王毅璠钱立新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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