钙基复合吸收剂的制备及烟气同时脱硫脱硝性能  

Preparation of calcium-based composite absorbent and simultaneous removal performance of SO_(x)and NO_(x)from flue gas

作　　者：李洋 刘洋[2] 李长明 付亮亮 余剑[2] Yang LI;Yang LIU;Changming LI;Liangliang FU;Jian YU(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang,Liaoning 110142,China;State Key Laboratory of Multiphase Complex System,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Ecology and Environment,Beijing Technology and Business University,Beijing 100048,China)

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]北京工商大学生态环境学院,北京100048

出　　处：《过程工程学报》2023年第10期1446-1457,共12页The Chinese Journal of Process Engineering

基　　金：政府间国际科技创新合作项目(编号:2022YFE0105800)。

摘　　要：针对干法超低温(<120℃)烟气同时脱硫脱硝技术难题,本工作将强氧化剂与高比表面积消石灰耦合制备钙基复合吸收剂,实现了超低温(<120℃)烟气干法高效同时脱除硫氧化物(SO_(x))和氮氧化物(NO_(x))。不同氧化剂种类和负载量的钙基复合吸收剂烟气脱硫脱硝性能评价结果表明,强氧化剂的加入不仅提升了消石灰脱硫性能,还能与消石灰协同实现同时脱硝;氧化剂种类、添加量对烟气同时脱硫脱硝影响显著,而且烟气具有适当的水分含量和氧含量有利于提升脱硫脱硝效率。根据钙基复合吸收剂烟气净化反应前后的晶相结构、热分解、微观形貌、比表面积等表征结果可发现,SO_(2)和NO首先被强氧化剂氧化,然后与消石灰反应生成相应的硫酸盐和硝酸盐,提高了脱硫和脱硝效率。本研究有望为烟气超低排放升级改造或小型工业锅炉烟气净化提供一种新的净化材料与工艺。In order to solve the technical problems of simultaneous desulfurization and denitrification of flue gas at ultra-low temperatures(<120℃)by dry process,this work prepared several calcium-based composite absorbents by coupling different strong oxidants with lime of high specific surface area,which can realize the efficient simultaneous removal of sulfur oxides(SO_(x))and nitrogen oxides(NO_(x))from flue gas at ultra-low temperature(<120℃).The results of desulfurization and denitrification performance evaluation of calcium-based composite absorbers with different oxidant types and loadings showed that the addition of strong oxidants not only improved the desulfurization performance of Ca(OH)_(2)but also achieved simultaneous denitrification with Ca(OH)_(2).The type and amount of oxidant had a significant influence on the simultaneous desulfurization and denitrification of flue gas,and the appropriate moisture and oxygen contents of flue gas were beneficial to improve the desulfurization and denitrification efficiency.According to the characterization results of crystal structure,thermal decomposition,microstructure,and specific surface area of calcium-based composite absorbers before and after the flue gas purification reaction,it can be found that SO_(2)and NO are first oxidized by strong oxidants,and then react with hydrated lime to generate corresponding sulfates and nitrates,improving the desulfurization and denitrification efficiency.This study is expected to provide a new purification material and process for the upgrading of the intrinsic engineering process or purification of small industrial boilers to achieve ultra-low emission requirements.

关 键 词：同步脱硫脱硝 钙基复合吸收剂 氧化剂 反应机制 

分 类 号：X701[环境科学与工程—环境工程]