脱硫剂喷吹耦合活性焦技术降低烧结烟气SO_(2)  

SO_(2)reduction in sintering flue gas by desulfurizer injection and activated coke technology

作　　者：李金辉 陶家杰 于阳 罗凯成 蔡胤清 龙红明 LI Jinhui;TAO Jiajie;YU Yang;LUO Kaicheng;CAI Yinqing;LONG Hongming(Jiangyin Xingcheng Special Steel Works Co.,Jiangyin 214429,Jiangsu,China;School of Metallurgical Engineering,Anhui University of Technology,Ma′anshan 243032,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering&Resources Recycling,Anhui University of Technology,Ma′anshan 243002,Anhui,China)

机构地区：[1]江阴兴澄特种钢铁有限公司,江苏江阴214429 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]安徽工业大学冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243002

出　　处：《中国冶金》2023年第11期151-157,共7页China Metallurgy

基　　金：国家自然科学基金资助项目(52174290)。

摘　　要：烧结生产作业过程中会产生大量二氧化硫(SO_(2))、氮氧化物(NO_(x))和粉尘等大气污染物,是钢铁污染物排放的主要来源。某钢厂435 m^(2)烧结机采用逆流式活性焦一体化脱除工艺进行污染物减排,减排设备长期运行出现老化,造成SO_(2)浓度超过减排系统所能承受的最大值,减排后烟气中SO_(2)浓度超标,且对活性焦脱硝能力产生了不利影响。为减轻活性焦减排压力,在烧结大烟道处设置脱硫剂喷吹减排系统,形成了“过程减排”和“末端治理”相结合的烟气污染物减排技术。实际应用结果表明,喷吹脱硫剂后活性焦入口烟气SO_(2)浓度由853.78 mg/m^(3)降低至668.76 mg/m^(3),达到了活性焦脱硫脱硝工艺正常运行的工艺条件,有效解决了SO_(2)浓度超负荷的问题。活性焦入口处粉尘浓度由25.48 mg/m^(3)上升至31.39 mg/m^(3),烟气中粉尘增加量的不明显,减排工艺的脱硫脱硝效果未受到负面影响,烟气在经过活性炭系统后,满足超低排放要求。本研究对烧结烟气污染物治理技术的现场工业应用具有参考价值。A large amount of air pollutants such as sulfur dioxide(SO_(2)),nitrogen oxides(NO_(x)),and dust can be produced in the process of iron ore sintering,which is the main source of steel pollutant emissions.A certain steel plant′s 435 m^(2) sintering machine employs a countercurrent integrated process with activated coke for the reduction of pollutant emissions.The emission control equipment has experienced prolonged operation,leading to aging issues.Consequently,the concentration of SO_(2) has exceeded the maximum threshold that the emission control system can withstand.Following emission control,the SO_(2) concentration in the exhaust gas has surpassed acceptable limits,and it has adversely impacted the denitrification capability of the activated coke.In order to alleviate the pressure of active coke emission reduction,a desulfurizer injection emission reduction system was set up in the sintering flue,forming combined emission reduction technology of"process optimization"and"end-of-pipe treatment"for flue gas pollutants.The practical application results demonstrate that,following the injection of desulfurizing agents,the SO_(2) concentration in the inlet flue gas of activated coke decreases from 853.78 mg/m^(3) to 668.76 mg/m^(3),meeting the operational conditions required for the normal operation of the activated coke desulfurization and denitrification process.This effectively addresses the issue of excessive SO_(2) concentration.The dust concentration at the activated coke′s inlet increases from 25.48 mg/m^(3) to 31.39 mg/m^(3),with relatively minor increment in dust content in the exhaust gas.The emission control process′s desulfurization and denitrification efficiency remain unaffected by these changes and not experience any adverse effects.After the flue gas is reduced by the activated carbon system,the ultra-low emission requirement is reached.This study has reference value for the field industrial application of sintering flue gas pollutant treatment technology.

关 键 词：烧结烟气 脱硫 脱硫剂 喷吹 活性焦 

分 类 号：X757[环境科学与工程—环境工程]