Method for reducing NOx emission in iron ore sintering process

A sintering process, iron ore technology, applied in fuel additives, petroleum industry, fuel, etc., can solve the problems of high additive consumption and low emission reduction, and achieve the effect of reducing NOx emissions

Active Publication Date: 2015-11-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current NOx emission reduction methods do not consider the characteristics of NOx produced by coke powder (or) non-coal combustion process of different particle sizes. They all treat or control the fuel as a whole, so that the emission reduction is not high, or the consumption of additives is large.

Method used

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  • Method for reducing NOx emission in iron ore sintering process

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Effect test

Embodiment 1

[0025] A method for reducing NOx emissions in the iron ore sintering process of the present invention comprises sieving the coke powder used for iron ore sintering into three grades of -1mm, 1-3mm and +3mm. Mix -1mm coke powder, straw charcoal and asphalt with a particle size of -1mm at a mass fraction of 75%, 18%, and 7% respectively, and then press it under a pressure of 1.5MPa to form a mixture with a particle size of 1-3mm. fuel particles. Add the prepared 1-3mm mixed fuel particles and 1-3mm coke powder to fine-grained iron ore (average particle diameter ≤ -2mm), part of coarse-grained iron ore (average particle diameter>-2mm), flux and In the process of returning to the ore, the alkalinity of the mixed material is 2.0 by controlling the proportion of the coarse-grained grade, and then the mixed material is granulated once in a cylinder mixer, and the granulation time is 4 minutes. The mixed material that has been granulated once and the modified +3mm coke powder (add 10...

Embodiment 2

[0027]A method for reducing NOx emissions in the iron ore sintering process of the present invention comprises sieving coke powder for iron ore sintering into three different particle sizes of -1mm, 1-3mm and +3mm. Firstly mix -1mm coke powder with -1mm semi-coke and asphalt according to the mass fraction of 80%:15%:5%, and then press it under the pressure of 2.5MPa to form a particle size of 1-3mm. Mix fuel pellets. Add the prepared 1-3mm mixed fuel particles and 1-3mm coke powder to fine-grained iron ore (average particle size≤-2mm), part of coarse-grained iron ore (average particle size>-2mm), flux and In the process of returning to the ore, the alkalinity of the mixed material is 2.2 by controlling the addition ratio of the coarse-grained grade, and then the mixed material is granulated once in a cylinder mixer, and the granulation time is 4.5 minutes. The mixed material that has been granulated once, the modified +3mm coke powder (+3mm coke powder is added with slaked li...

Embodiment 3

[0029] A method for reducing NOx emissions in the iron ore sintering process of the present invention comprises sieving coke powder for iron ore sintering into three different particle sizes of -1mm, 1-3mm and +3mm. Firstly mix -1mm coke powder with -1mm fat coal and asphalt according to the mass fraction of 75%:17%:8%, and then press it under the pressure of 1.5MPa to form a particle size of 1-3mm. Mix fuel pellets. Add the prepared 1-3mm mixed fuel particles and sieved 1-3mm coke powder to fine-grained iron ore (average particle diameter≤-2mm), part of coarse-grained iron ore (average particle diameter>-2mm ), flux and return ore, the basicity of the mixture is 2.2 by controlling the proportion of coarse-grained grades, and then the mixture is granulated once in a cylinder mixer, and the granulation time is 5 minutes. The mixed material that has been granulated once, the modified +3mm coke powder (+3mm coke powder is added with slaked lime with a mass fraction of 15%, and t...

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Abstract

The invention discloses a method for reducing NOx emission in the iron ore sintering process. Firstly, conventional sintering fuel coke powder or anthracite is screened into three grain sizes of -1 mm, 1-3 mm and +3 mm; the coke powder or anthracite with the grain size being -1 mm and high-reaction-activity fossil fuel or biomass fuel with the grain size being -1 mm are pressed into fuel particles with the grain size being 1-3 mm; the fuel particles obtained through pressing with the grain size being 1-3 mm and the coke powder or anthracite obtained through screening with the grain size being 1-3 mm are added into fine particle iron ore, part of coarse particle iron ore, flux and return mines to be subjected to granulation in a rotary drum mixer; and the granulated mixed material, modified coke powder or anthracite with the particle size being +3 mm and the remaining coarse particle iron ore are subjected to secondary mixing granulation, and the obtained mixed material is distributed and then ignited and sintered. Generation of fossil fuel NOx in each grain size is controlled specifically according to the features of NOx generated by the fossil fuel in different grain sizes, so that generation of NOx is reduced to a greater extent to reduce NOx emission, and NOx emission is reduced by 20%-40%.

Description

technical field [0001] The invention belongs to the sintering industry in the field of iron and steel metallurgy, and relates to a method for reducing NOx emissions in the iron ore sintering process. Background technique [0002] NOx (nitrogen oxides) is one of the main causes of photochemical smog and acid rain. The pollution caused by its emission seriously affects the ecological environment and endangers human health. The iron ore sintering process is the main source of NOx emissions in iron and steel enterprises. The energy consumption of the iron ore sintering process is mainly the consumption of fossil fuels such as solid fuel coke powder and anthracite, accounting for about 75-80% of the total energy consumption of the process. More than 90% of NOx is converted from fuel nitrogen. About 1 million tons of NOx are discharged into the atmosphere through the sintering chimney every year, accounting for 48% of the total emissions of iron and steel enterprises and 10% of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/245C10L10/02
Inventor 甘敏季志云范晓慧陈许玲姜涛李光辉余志元周阳黄晓贤吕薇袁礼顺郭宇峰杨永斌黄柱成李骞张元波朱忠平许斌何向宁李强
Owner CENT SOUTH UNIV
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