摘要
烧结作为长流程钢铁行业生产中的重要组成部分,生产过程会排放出大量的含有SO_(2)、NO_(x)、粉尘等污染物的烟气,是钢铁行业环境治理的重要对象。兴澄特钢烧结分厂秉承源头削减、过程控制和末端治理的理念,在烧结全流程中通过控制高硫精粉比例,配加全焦粉和氧化铁皮,从源头上减少SO_(2),NO_(x)的生成;通过减少设备漏风、防止内循环系统的串风振动、改进脱硫脱硝烟温换热器,控制烟气中的氧含量;将碱度控制在1.9以上,保持高碱度烧结,控制焦粉中小于0.5 mm的粒度比例,并积极利用烟气内循环系统,减少烧结过程中污染物排放;采用电除尘和活性焦一体化脱除系统,从末端完成污染物的控制,烧结烟气中SO_(2)、NO_(x)和粉尘排放指标分别为4 mg/m^(3)、41 mg/m^(3)和2 mg/m^(3),全部达到了国家钢铁行业大气污染物超低排放的标准。
Sintering as an important part of the production of long process iron and steel industry,the production process will emit a lot of flue gas containing SO_(2),NO_(x),dust and other pollutants,is an important object of environmental governance in the iron and steel industry.Adhering to the concept of source reduction,process control and end treatment,Xingcheng Special Steel Sintering plant reduces the generation of SO_(2) and NO_(x) from the source by controlling the proportion of high-sulfur fine powder,adding full coke powder and oxide sheet in the whole sintering process;the oxygen content in flue gas is controlled by reducing air leakage,preventing cross-air vibration in the internal circulation system and improving the temperature heat exchanger for desulfurization and denitrification.Control the alkalinity above 1.9,maintain high alkalinity sintering,control the particle size ratio of less than 0.5 mm in coke powder,and actively use the flue gas internal circulation system to reduce pollutant emission during sintering process;the integrated removal system of electric dust removal and active coke is used to complete the control of pollutants from the end.The emission indicators of SO_(2),NO_(x) and dust in the sintering flue gas are 4 mg/m^(3),41 mg/m^(3) and 2mg/m^(3) respectively,all of which meet the national ultra-low emission standards of air pollutants in the iron and steel industry.
作者
罗凯成
徐彩龙
李金辉
邓军平
于阳
Luo Kaicheng;Xu Cailong;Li Jinhui;Deng Junping;Yu Yang(Jiangyin Xingcheng Special Steel Co.,Ltd.,Jiangyin 214400,Jiangsu)
出处
《河北冶金》
2024年第2期74-78,共5页
Hebei Metallurgy
关键词
烧结
减排
全流程
末端治理
活性焦
焦粉
sintering
reduce emissions
the whole process
end treatment
active coke
coke powder
