添加剂协同选择性非催化还原NO的过程研究  

NO Removal by Adding Additives in the Selective Non-Catalytic Reduction Process

作　　者：高攀[1] 路春美[1] 韩奎华[1] 牛胜利[1] 熊志波[1] 

机构地区：[1]山东大学能源与动力工程学院,济南250061

出　　处：《燃烧科学与技术》2008年第4期333-337,共5页Journal of Combustion Science and Technology

基　　金：山东省自然科学基金资助项目(Z2006F04);山东省环境保护重点科技资助项目(2006046)

摘　　要：在多功能脱硝实验台上研究了不同条件下加入钠盐、含氧有机化合物以及天然气3类添加剂，对选择性非催化还原（SNCR）NO过程的影响．结果表明：碳酸钠随氨水、尿素喷入炉膛，提高了全部实验温度下SNCR的脱硝率，喷入炉膛的碳酸钠最佳质量浓度为950mg／m^3；900℃时，实验选用的5种钠物质均能一定程度提高SNCR的脱硝效率，其促进能力以乙酸钠、甲酸钠、氢氧化钠、碳酸钠、氯化钠的顺序降低；800-900℃时，乙醇、丙三醇、乙酸甲酯均明显提高了SNCR的脱硝率，但在1000℃时又不同程度降低了NO最高还原率；加入天然气改变了SNCR脱硝反应的温度特性，拓宽了反应温度窗口，并且几乎没有影响最佳脱硝效率，通入的天然气量越大脱硝率越高，但考虑到天然气的燃尽，建议天然气／NO物质的量比取1．0．The effect of the additives （sodium saltS-, oxygenated organic additives, natural gas） on the selective non-catalytic reduction （SNCR） reaction were studied using a muhifunctional DeNOx laboratory reactor. Na2CO3 can enhance NO removal efficiency of SNCR at all of the experimental temperature. There exists best concentration of Na2CO3 which is 950 mg/m^3. The NO reduction efficiency increased with adding all of experimental sodium material, descended in the order HCOONa, CH3COONa, NaOH, Na2CO3 and NaCl. C2H5OH, C3H8O3 and C3H6O2 promote the SNCR process obviously at 800---900 ℃, but the maximum NO removal efficiency decreases at 1 000℃. The natural gas investigated has been able to enlarge the width of the temperature window where NO abatement occurs without compromising significantly the maximum efficiency of the process. The NO removal efficiency increases with the natural gas concentration of the flue gas. The mole ratio of natural gas and NO should be 1.0 considering the bum-off rate of natural gas.

关 键 词：选择性非催化还原 脱硝率 添加剂 反应温度窗口 

分 类 号：TK16[动力工程及工程热物理—热能工程]