燃煤烟气脱硝喷卤素协同脱汞效果评估  

Effect evaluation of synergistic mercury removal by halogen injection and gas denitrification in coal-fired power plant

作　　者：黄见勋 尹子骏 马云龙 苏胜[2] 王乐乐[3] 鲍强[3] 张庆文 向军[2] 雷嗣远[3] 叶顺长 HUANG Jianxun;YIN Zijun;MA Yunlong;SU Sheng;WANG Lele;BAO Qiang;ZHANG Qingwen;XIANG Jun;LEI Siyuan;YE Shunchang(Xiamen Huaxia International Power Development Co.,Ltd.,Xiamen 361026,China;State Key Laboratory of Coal Combustion(Huazhong University of Science&Technology),Wuhan 430074,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Suzhou Branch,Suzhou 215153,China;Huaneng Shanghai Shidongkou No.2 Power Plant,Shanghai 200942,China)

机构地区：[1]厦门华夏国际电力发展有限公司,福建厦门361026 [2]煤燃烧国家重点实验室(华中科技大学),湖北武汉430074 [3]西安热工研究院有限公司苏州分公司,江苏苏州215153 [4]华能上海石洞口第二电厂,上海200942

出　　处：《热力发电》2022年第10期194-200,共7页Thermal Power Generation

基　　金：国家自然科学基金联合基金项目(U20A20302);国家电力投资集团有限公司科技项目(2020-KJ-007)。

摘　　要：为进一步降低现有燃煤机组烟气污染物排放质量浓度,实现大气污染物的协同深度治理,选取现役的选择性催化还原(SCR)催化剂作为研究对象,对不同条件下HCl/HBr等卤素成分对现役SCR催化剂脱硝协同汞氧化效果进行实验研究,并设计卤素溶液喷射系统,依据实验室研究结果,在现场脱硝过程中进行了不同浓度NH_(4)Cl/NH_(4)Br溶液喷射的工程应用与试验。结果表明:脱硝过程合理添加NH_(4)Cl或NH_(4)Br溶液均可有效提高现役SCR脱硝催化剂对单质汞氧化能力,HCl/HBr共同作用可以提高单一HCl在SCR催化剂表面对单质汞的氧化效果,进一步通过脱硝、下游脱硫、除尘等环保设施实现汞污染物的高效协同脱除。In order to further reduce the emission mass concentration of pollutants from flue gas of existing coalfired units and realize coordinated and deep treatment of air pollutants,the active selective catalytic reduction(SCR)catalyst was selected as the research object,and the influence mechanism of halogen components such as HCl/HBr on the denitration synergistic mercury oxidation performance of the SCR catalyst under different conditions was systematically studied.Moreover,the halogen solution injection system was designed.According to the research result in laboratory,the engineering application and test using NH_(4)Cl/NH_(4)Br solution injection were carried out in the field denitration process.The results show that,reasonable addition of NH_(4)Cl or NH_(4)Br solution during the denitration process can effectively improve the mercury oxidation capacity of the existing catalyst.The combined action of HCl/HBr can improve the oxidation effect of single HCl on elemental mercury on the catalyst surface.Furthermore,through the denitration,downstream desulfurization,dust removal and other environmental protection facilities,efficient synergistic removal of mercury pollutants can be realized.

关 键 词：SCR烟气脱硝 催化剂汞氧化 卤素喷射 协同脱除 工程示范 

分 类 号：TK16[动力工程及工程热物理—热能工程]