摘要
以某低位布置E级燃气蒸汽联合循环机组余热锅炉为例,进行了选择性催化还原(SCR)脱硝技术数值模拟研究,得到余热锅炉SCR烟气脱硝系统流场和余热锅炉内部喷氨格栅的放置位置。结果表明:对于低位布置的燃气轮机,在扩口段烟道设置导流板能够有效改善催化剂入口截面上速度分布均匀性;提出了一种适用于余热锅炉扩口烟道的分割仓式导流板结构;采用分区可调的多组一体式氨注射混合器能在较短距离内加强氨气和NOx的混合;将喷氨格栅布置在模块2之前时,催化剂入口截面上NH3分布均方根偏差为2.05%;在机组实际运行时对喷氨格栅进行分区优化调整可以获得最佳的余热锅炉出口截面NOx分布均匀性和最小的氨逃逸量。
By taking the waste heat boiler in an E class gas-steam combined cycle unit with low position arrangement as the example,numerical simulation was carried out for the selective catalytic reduction(SCR)denitration technology.The flow field of the deNOx system was obtained and the installation position of the ammonia injection grid(AIG)inside the heat recovery boiler was determined.The results show that,guide plates are necessary in inlet flue duct of the heat recovery boiler when the gas turbine is arranged at a lower position.A bin type guide plate,which is suitable for the inlet gas duct of heat recovery boiler,is proposed.Using a multicomponent ammonia injection mixer with adjustable partition can strengthen the mixing of ammonia and NOx in short distance.The square root deviation of NH3 distribution on the catalyst inlet plane is 2.05%if the AIG are installed in front of module 2.Optimization test of the AIG should be carried out to obtain the best uniform of NOx distribution and less ammonia slip on the exit section of heat recovery boiler.
作者
董陈
曾洋波
李文杰
黄晶晶
袁壮
舒凯
李俊
唐嘉宏
王庆韧
DONG Chen;ZENG Yangbo;LI Wenjie;HUANG Jingjing;YUAN Zhuang;SHU Kai;LI Jun;TANG Jiahong;WANG Qingren(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Guangdong Huizhou LNG Power Co.,Ltd.,Huizhou 516082,China)
出处
《热力发电》
CAS
北大核心
2020年第12期140-145,共6页
Thermal Power Generation
