尿素/H_2O_2溶液同时脱硫脱硝机理研究  

Simultaneous desulfurization and denitrification of flue gas by using urea/H_2O_2 solution

作　　者：方平[1] 岑超平[1] 唐志雄[1] 陈定盛[1] 陈志航[1] 钟佩怡[1] 

机构地区：[1]环境保护部华南环境科学研究所,广东广州510655

出　　处：《燃料化学学报》2012年第1期111-118,共8页Journal of Fuel Chemistry and Technology

基　　金：国家高技术研究发展计划(863计划;SS2012AA061905);广东省战略性新兴产业核心技术攻关项目(2011A032303002);中央级公益性科研院所基本科研业务专项(zx_200910_02)

摘　　要：在填料塔上对尿素/H2O2溶液同时脱硫脱硝进行了实验研究。结果表明,尿素溶液对SO2具有很高的去除效率,但对NOx的去除受到多种因素的影响。实验主要研究了H2O2浓度、吸收反应温度、溶液pH值等因素对脱硝效率的影响,并确定了最佳实验条件,在此条件下脱硫脱硝效率分别达到100%和52.6%。同时,采用化学分析法和气相色谱法对尿素溶液同时脱硫脱硝的反应产物进行分析,推导出尿素/H2O2溶液同时脱硫脱硝的反应机理和总化学反应方程式。该技术可用于对现有湿法脱硫技术的改造,使其同时具有脱硫脱硝功能。Simultaneous desulfurization and denitrification of flue gas by using urea/H2O2 solution were performed in a packed column.The results indicated that urea solution exhibits high removal efficiency towards SO2,but the efficiency of NOx removal is influenced by many factors such as H2O2 concentration,reaction temperature and initial pH value.Under the optimal conditions,the removal efficiencies towards SO2 and NOx reach 100% and 52.6%,respectively.Meanwhile,the reaction products were analyzed by chemical method and gas chromatography;the reaction mechanism and overall reaction equations for the simultaneous desulfurization and denitrification using urea/H2O2 solution are deduced.Current method may be used to modify the present wet desulfurization units and endue them with the ability of simultaneous denitrification.

关 键 词：尿素 H2O2 脱硫 脱硝 反应机理 

分 类 号：X511[环境科学与工程—环境工程]