Preparation method of pellets for reducing emission of SO2 and NOx in sintering process

A sintering process and pelletizing technology, which is applied in the field of pollutant emission reduction in the sintering process, can solve the problems of poor emission reduction effect and high cost of flue gas treatment, and achieve improved emission reduction efficiency, high emission reduction efficiency of flue gas, and wide application. Foreground effect

Pending Publication Date: 2021-04-06
ANHUI UNIVERSITY OF TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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, such as poor online emission reduction effect and high cost of flue gas treatment; provide a method for preparing pellets for reducing SO2 and NOx emissions in the sintering process, by preparin

Method used

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  • Preparation method of pellets for reducing emission of SO2 and NOx in sintering process
  • Preparation method of pellets for reducing emission of SO2 and NOx in sintering process
  • Preparation method of pellets for reducing emission of SO2 and NOx in sintering process

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Embodiment 1

[0036] Such as figure 1 As shown, a method for preparing pellets used in the sintering process to reduce SO2 and NOx emissions in this embodiment first prepares the inner layer pellets 100, and the inner layer pellets 100 include inner layer pelletizing material and ammonia Inhibitors, the ammonia inhibitors are thermally decomposed to release ammonia, and the N element content in the ammonia inhibitors accounts for 0.02-0.15% of the mass of the inner pellets, in this embodiment, it is 0.047%, which is converted into urea The mass ratio is 0.1%; and then prepare a wrapping layer 200 on the outside of the inner pellet 100, and the wrapping layer 200 includes an outer layer of pelletizing material; the particle size of the outer layer of pelletizing material reaches -0.149mm particle size mass percentage content ≥ 95%; the particle size of the inner layer pelletizing material reaches -0.074mm particle size mass percentage content ≥ 95%; the particle size of the inner layer pelle...

Embodiment 2

[0063] The preparation method and sintering emission reduction method of the pellets in this embodiment are basically the same as in 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, The mass ratio converted to urea 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

[0065] The preparation method and sintering emission reduction method of the pellets in this embodiment are basically the same as in 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, The mass ratio converted to urea 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 preparation method of pellets for reducing emission of SO2 and NOx in a sintering process, 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 from an inner-layer pelletizing material, an ammonia inhibitor is added in the preparation process of the inner-layer pellets, the ammonia inhibitor is decomposed by heating to release ammonia gas, the content of N element in the ammonia inhibitor is enabled to account for 0.02%-0.15% of the mass of the inner-layer pellets, and then the outer parts of the inner-layer pellets are coated with coating layers by means of an outer-layer pelletizing material; the wrapping layer outside the pellets can play a role in delaying the release rate of NH3, so that the NH3 is released stably in a centralized manner at the temperature of 600-800 DEG C, and NOx is discharged at the temperature of 650 DEG C and is consistent with the release temperature interval of the NH3, so that the NOx reacts with the NH3; and meanwhile, generation of dioxin can be inhibited in the cooling process until the temperature of the sintering flue gas is reduced 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 method for preparing pellets used for reducing SO2 and NOx emissions 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 parti...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/16
CPCC22B1/2406C22B1/243C22B1/16
Inventor 王毅璠杨涛杨美洲龙红明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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