摘要
湿式电除尘器(wet electrostatic precipitator,WESP)对细颗粒物PM2.5的捕集效率高于传统干式电除尘器。为实现烟尘趋零排放,在WESP中加入化学凝并剂,研究化学凝并剂的种类、浓度、加入点位等对燃煤粉尘凝并效果及除尘效率的影响。结果表明:添加化学凝并剂能够促进燃煤粉尘颗粒的凝并,添加果胶(pectin,PG)后,粉尘颗粒的中位径由28.19μm增加到45.28μm;在PG浓度为1.0×10^(-2)g/L时凝并效果最好,除尘效率达到96.42%;聚丙烯酰胺(polyacrylamide,PAM)的电晕放电性能最好,PAM与水蒸气协同作用能提高凝并效果,1.0×10^(-2)g/L的PAM与3.2kg/h的水蒸气协同作用时除尘效率达到96.68%。加入化学凝并剂后,可促进细颗粒粉尘的凝并,增强WESP对于细颗粒物的捕集效果。
The wet electrostatic precipitator(WESP)has a much higher capture rate for fine particulate matter PM2.5than the traditional dry electrostatic precipitator.In order to achieve zero emission of smoke and dust,it is proposed to add chemical coagulant into wet electrostatic precipitator.The influences of the medicine type,concentration and addition point of chemical coagulant on coal dust coagulation effect and collection efficiency are studied.The results show that the addition of chemical coagulant can promote the coagulation of coal-fired dust particles.After the addition of pectin(PG),the median diameter of dust particles increases from 28.19μm to 45.28μm.At the concentration of PG is 1.0×10-2g/L,the coagulation effect is the best,and the collection efficiency reaches 96.42%.Polyacrylamide(PAM)has the best corona discharge performance.The synergistic effect of PAM and water vapor can improve the coagulation effect,1.0×10-2g/L PAM and 3.2kg/h water vapor synergize,and the collection efficiency reaches 96.68%.The addition of chemical coagulant promotes the coagulation of fine dust particles and enhances the capture effect of WESP for fine particles.
作者
翟晓宇
肖立春
韩莹莹
ZHAI Xiaoyu;XIAO Lichun;HAN Yingying(School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,Hebei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第2期651-658,共8页
Proceedings of the CSEE
基金
河北省自然科学基金项目(E2015203236)
秦皇岛市科学技术研究与发展计划(202003B033)。
关键词
湿式电除尘器
细颗粒物
化学凝并
除尘效率
wet electrostatic precipitator
fine particles
chemical coagulation
collection efficiency
