添加剂H_(2)对SNCR脱硝特性的影响  

Effect of H_(2) additive on SNCR denitrification characteristics

作　　者：刘平[1] 王林伟 李天硕 左言骏 刘猛[1] 段钰锋[1] LIU Ping;WANG Linwei;LI Tianshuo;ZUO Yanjun;LIU Meng;DUAN Yufeng(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Huaibei Shenwan Power Generation Co.,Ltd.,Huaibei 235000,China)

机构地区：[1]能源热转换及其过程测控教育部重点实验室(东南大学),江苏南京210096 [2]淮北申皖发电有限公司,安徽淮北235000

出　　处：《电力科技与环保》2024年第2期108-115,共8页Electric Power Technology and Environmental Protection

基　　金：国家重点研发计划项目(2022YFB4100302)。

摘　　要：在管式炉上探讨了选择性非催化还原的脱硝特性,分析了有无气体添加剂H_(2)在不同氨氮比(normalized stoichiometric ratio,NSR)下的N_(2)O、NO、NH_(3)、SO_(2)的排放特性及其随温度的变化规律。分析结果表明:无添加剂的情况下,在温度870℃、NSR为2.0时,NO最大还原效率为90%;N_(2)O生成浓度和NO还原效率的变化趋势接近,NSR越大,NO还原效率越高,N_(2)O排放浓度越大;NO还原温度窗口与N_(2)O生成的温度窗口基本上吻合。氨逃逸量在低于750℃时,明显增大,在高于850℃时,趋于0;SO_(2)浓度随温度的升高呈现与氨逃逸相反的变化趋势;随着H_(2)添加量的增大,NO还原温度窗口显著拓宽,且向低温移动,添加后最大NO还原效率超过90%,对应温度为820℃左右;N_(2)O浓度随温度呈先上升后下降的趋势,随H_(2)添加量的增加,低温区的N_(2)O浓度升高,且峰值向低温区移动,温度窗口变宽;氨逃逸量随温度升高先增大后降低,且这种趋势在低温区更明显,反应温度超过850℃,不同添加比下的氨逃逸量趋于0;添加比对SO_(2)浓度的影响在低温和高温段都不明显,SO_(2)浓度与氨逃逸量呈现相反的变化趋势。所述H_(2)添加后的污染物排放规律可为同类研究提供参考。The denitrification characteristics of selective non-catalytic reduction(SNCR)in a tubular furnace were explored.The effects of with and without additive H_(2) under different normalized stoichiometric ratio(NSR)on NO removal process of SNCR and the emission of N_(2)O,NO,NH_(3),and SO_(2) were investigated.The results showed that without additives,the maximum reduction efficiency of NO exceeded 90% occurs at temperature of 870℃ and NSR of 2.0.The variation trends of N_(2)O emission and NO reduction efficiency are similar.The larger the NSR,the bigger the SNCR efficiency,and the larger the N_(2)O emission.The temperature window of NO reduction is almost the same as that of N_(2)O generation.The escape amount of NH_(3) increases on left of its temperature window and tends to zero on right of it.SO_(2) is contrary to NH_(3) with increase of temperature.As H_(2) addition is increasing,the NO reduction temperature window widens significantly and shifts to low temperature.The maximum NO reduction efficiency after adding H_(2) exceeds 90% at 820℃.N_(2)O rises first with increment of temperature and then declines.With H_(2) addition,N_(2)O ascends in low temperature zone and its peak moves towards low temperature zone and its temperature window broadens.NH_(3) escape amount rises first with increment of temperature and then declines which is apparent in low temperature zone.As it is over 800℃,NH_(3) escape tends to zero whatever addition of H_(2) or not.It is not apparent for the effect of addition of H_(2) on SO_(2) concentration.SO_(2) is opposite to NH_(3) as the temperature rises.

关 键 词：SNCR 添加剂 H_(2) N_(2)O排放 脱硝特性 

分 类 号：TK09[动力工程及工程热物理]