烧结机尾电改袋除尘器脉冲喷吹数值模拟  

Numerical simulation of pulse-jet cleaning of bag house transformed from ESP in sintering machine tail

作　　者：宋孝红[1] 陈旺生[1] 李迁威 李丹天[1] 李泽[1] 

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081

出　　处：《环境工程学报》2017年第7期4217-4222,共6页Chinese Journal of Environmental Engineering

基　　金：国家高技术研究发展计划(863计划)项目(2012AA062501)

摘　　要：在电改袋除尘器中,为更好地利用原静电除尘器的内部空间,可采用长袋及脉冲喷吹清灰方式。利用CFX软件对脉冲喷吹系统进行模拟优化,结果表明,通过在喷嘴侧壁开设20 mm小孔,可有效增大喷吹气体流量,且以开设2个或者3个为佳。在喷嘴侧壁开孔数量、喷吹压力、喷吹距离、喷吹孔直径和滤袋长度等因素中,喷吹压力和喷吹孔直径对清灰的影响较大,增大喷吹压力和喷吹孔直径均有利于改善清灰效果,喷嘴侧壁开孔数量对清灰的影响较喷吹压力和喷吹孔直径小,喷吹距离仅对滤袋上部清灰效果有影响,而滤袋长度主要影响滤袋中下部的清灰效果,且影响较小,选择长袋具有可行性。This paper presents the results of a study on the pulse jet cleaning of a baghouse transformed from an electrostatic precipitator （ESP） in a sintering machine tail. In order to make better use of the inner space of the ESP in the baghouse, a long filter bag and pulse-jet cleaning system was adopted. A numerical simulation of the time-average pressure in the injection pipe was performed using CFX software. The simulation result shows that there is negative pressure in the nozzle. Measures were taken to optimize the diameter of the holes set on the nozzle （now 20 mm） , which resulted in effective increase in the gas flow of the pulse-jet. The best effect was ob- served when the number of holes was ＇ 2＇ or ＇ 3 ＇ Also studied were the effects of difference in the number of holes in the nozzle, pulse-jet pressures, pulse-jet distances, the spray aperture diameter, and filter bag lengths; on the peak pressure of the bag filter. The results indicate that the pulse-jet pressure and the spray aperture di- ameter have significant effects, and that increasing the pulse-jet pressure and spray aperture diameter help to im- prove the cleaning efficiency. The number of nozzle holes has less effect than the pulse-jet pressure and diameter of the spray aperture. The pulse-jet-distance affects only the cleaning efficiency of the bag-filter top. The filter- bag length has the most effect on the cleaning efficiency of the bag-filter bottom, but this effect is small. There- fore, the use of long filter bags is feasible for use in baghouses transformed from ESPs.

关 键 词：静电除尘器 电改袋除尘器 脉冲喷吹清灰 数值模拟 峰值压力 

分 类 号：X513[环境科学与工程—环境工程]