燃煤锅炉SNCR脱硝对于SO_3生成的研究  

Influence of SNCR Denitration Reform on the Formation of SO_3

作　　者：胡建根 李文华 韩高岩 吕洪坤 肖海平[3] 王磊 HU Jiangen;LI Wenhua;HAN Gaoyang;LV Hongkun;XIAO Haiping;WANG Lei(State Grid Zhejiang Electric Power Corporation Electric Power Research Institute,Hangzhou 310014,China;Zhejiang Zheneng Wenzhou Power Plant Co.,Ltd.,Wenzhou 325602,China;School of Energy,Power and Mechanical Engineering,North China Electric Power U niversity,Beijing 102206,China)

机构地区：[1]国网浙江省电力公司电力科学研究院,浙江杭州310014 [2]浙江浙能温州发电有限公司,浙江温州325602 [3]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《锅炉技术》2018年第2期75-80,共6页Boiler Technology

基　　金：国家自然科学基金资助项目(51206047)

摘　　要：利用化学反应动力学计算研究燃煤锅炉的选择性非催化还原(SNCR)对于气相中SO_3生成过程的影响,并进一步考虑喷氨位置、氨氮比与SO_3脱除率的关系。结果表明:SNCR对于SO_3具有一定脱除作用,这主要是由于喷氨后,通过相关基元反应使得自由基H和HO_2的浓度变大,进而抑制或分解SO_3的缘故。随着氨氮比增加,SO_3脱除率升高,当氨氮比为1.2,在烟气温度约1 000℃位置处喷氨时SO_3脱除效果最佳。Chemical kinetics model calculation is used to research the influence of coal-fired boiler selective non-catalytic reduction(SNCR)on S03 generation,and then further study the relationship between jet position of ammonia、ammonia nitrogen ratio(n(NH3)/n(NO))and S03 removal rate.Results show that SNCR has certain effect on S03 removal,this is mainly because the concentration of free radicals H and H02 increases through relevant elementary reaction after spraying ammonia,thereby inhibiting or decomposition of S03.And with the increase of ammonia nitrogen ratio,S03 removal rate increases.When the ammonia nitrogen ratio is 1.2,S03 removal rate is highest when spraying ammonia location where the smoke temperature is about 1 000°C.

关 键 词：化学反应动力学计算 燃煤锅炉 选择性非催化还原 SO3 基元反应 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]