氧化镁干法脱硫技术对烧结烟气的实践  

Application of magnesium-based dry flue gas desulfurization in sintering flue gas

作　　者：曹琬 张卫军 郭子杨 Cao Wan;Zhang Weijun;Guo Ziyang(Northeastern University)

机构地区：[1]东北大学冶金学院

出　　处：《冶金能源》2022年第3期57-61,共5页Energy For Metallurgical Industry

基　　金：国家重点研发计划项目(2017YFA0700300)。

摘　　要：为解决烧结烟气低温脱硫效率低及脱硫产物难处理的问题,研究了氧化镁干法烟气脱硫技术。将该技术应用于烧结烟气,在60℃的干燥条件下,氧化镁干法烟气脱硫技术的脱硫效率稳定在99%。除此之外,通过采用场发射扫描电子显微镜(SEM)和X射线光电子谱(XPS)分析测试方法探究了镁基脱硫剂对SO_(2)的吸收机理。研究结果表明,镁基脱硫剂对SO_(2)的吸收方式属化学吸收,脱硫产物为硫酸盐类化合物。脱硫过程为:SO_(2)扩散至镁基脱硫剂表面并被表面上的氧缺陷位(O^(2-))氧化为亚硫酸盐,亚硫酸盐最终被烧结烟气中的氧气进一步氧化为硫酸盐。To solve the problems of low desulfurization efficiency and difficult disposal of desulfurization products of sintering flue gas,the dry flue gas desulfurization technology of magnesium oxide was studied.By the application in sintering flue gas,found that the desulfurization efficiency reached 99%steadily under the dry condition of 60℃.The absorption mechanism of SO_(2) with the desulfurizer was investigated by the means of scanning electron microscope and X-ray photoelectron spectroscopy,which was indicated that the absorption of SO_(2) by magnesium-based desulfurizer belonged to chemical absorption,and the product was sulfate.The desulfurization process was as follows:firstly,SO_(2) diffused to the surface of the magnesium-based desulfurizer,and then it was oxidized to sulfite by the oxygen defect site(O^(2-)),finally the sulfite was oxidized to the sulfate by the oxygen in the sintering flue gas.

关 键 词：低温 固定床 烧结烟气 干法脱硫 镁基脱硫剂 

分 类 号：X70[环境科学与工程—环境工程]