摘要
活性炭法脱硫脱硝因其净化效率高,不产生二次污染,能够实现多污染物协同处理等优点被广泛应用于烧结烟气处理中,但该工艺运行过程中活性炭容易“中毒”,极易发生安全事故,而目前国内外对活性炭中毒的成因仍鲜有报道。因此,研究烧结脱硫脱硝活性炭的中毒原因及机制有着重要的现实意义。通过对正常状态下和中毒后活性炭微孔中物质的分析,明确了活性炭中毒是由于烧结烟气中携带了大量的KCl和NaCl,粘附于电除尘电场极板和极线表面,三、四电场中极板表面粘附物中的NaCl质量分数分别达到了22%和8%,KCl质量分数分别达到了72%和83%,大幅削弱了电除尘对粉尘的捕集能力,并且超过了电除尘各电场对KCl和NaCl的负载能力,使得大量的KCl和NaCl随烧结烟气进入活性炭微孔中。根据对K、Na、Cl三种元素的来源分析,发现K_(2)O和Na_(2)O主要来自于铁矿粉,加入的混合水也贡献了大量的Na元素和少量的K元素;Cl元素则主要来自于加入的混合水,其贡献了71.4%的Cl元素,是原燃料系统提供的Cl元素的2.49倍,尤其是混合水中的焦化循环水。通过将焦化循环水与清水比例从9∶1稀释至1∶1,可以减少进入烧结系统中的Cl总量,有效破坏KCl和NaCl的瞬时大量生成,减轻KCl和NaCl对电场除尘能力的影响,脱硫脱硝入口粉尘浓度从平均225 mg/m^(3)大幅降至平均74 mg/m^(3),有效地避免了活性炭中毒。
The activated carbon method for desulfurization and denitrification is widely used in sintering flue gas treatment due to its high purification efficiency,no secondary pollution,and the ability to achieve collaborative treatment of multiple pollutants.However,during the operation of this process,activated carbon is prone to"poisoning"and safety accidents occur.Currently,there are stil few reports on the causes of activated carbon poisoning at home and abroad.Therefore,studying the poisoning causes and mechanisms of sintered desulfurization and denitrification-activated carbon is of great practical significance.Through the analysis of the substances in the micropores of activated carbon under normal conditions and after poisoning,it is clear that activated carbon poisoning is caused by the large amount of KCl and NaCl carried in the sintering flue gas,which adhere to the surface of the electrostatic precipitator electrode plate and electrode line.The NaCl mass fraction in the surface adhesion of the electrode plate in the third and fourth electric fields reached 22% and 8%,respectively,and the KCl mass fraction reached 72%and 83%,greatly weakening the dust collection ability of the electrostatic precipitator,And it exceeds the load capacity of various electric fields in the electrostatic precipitator on KCl and NaCl,causing a large amount of KCl and NaCl to enter the micropores of the activated carbon with the sintering flue gas.According to the source analysis of the three elements K,Na,and Cl,it was found that K_(2)O and Na_(2)O mainly come from iron ore powder,and the added mixed water also contributes a large amount of Na element and a small amount of K element.The Cl element mainly comes from the added the mixed water,which contributed 71.4% of the Cl element,which is 2.49 times higher than the Cl element provided by the raw fuel system,especially the coking circulating water in the mixed water.By diluting the ratio of coking circulating water to clean water from 9:1 to 1:1,the total amount of Cl entering the
作者
魏瑞瑞
顾凤年
卜树烽
楚天福
邱淑兴
丁成义
WEI Ruirui;GU Fengnian;BU Shufeng;CHU Tianfu;QIU Shuxing;DING Chengyi(Research Institute,Wuhu Xinxing Ductile Iron Pipes Co.,Ltd.,Wuhu 241002,Anhui,China;Ironmaking Department,Wuhu Xinxing Ductile Iron Pipes Co.,Ltd.,Wuhu 241002,Anhui,China;State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China;Panzhihua Iron and Steel Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China;School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243032,Anhui,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2023年第5期521-531,共11页
Journal of Iron and Steel Research
基金
国家自然科学基金青年基金资助项目(52104323)
冶金减排与资源综合利用教育部重点实验室开放基金资助项目(JKF20-03)
安徽省自然科学基金青年资助项目(2208085QE145)。
