数值模拟滤筒中负载尘饼对脉冲喷吹清灰效果的影响  

Numerical simulation of the effect of dust cake loading in filter cartridge on pulse injection

作　　者：邱俊 陈强 李建龙 吴代赦 QIU Jun;CHEN Qiang;LI Jianlong;WU Daishe(School of Resources,Environmental and Chemical Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学资源环境与化工学院,南昌330031

出　　处：《环境工程学报》2021年第3期1067-1074,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51704166);南昌大学研究生创新专项(CX2019109)。

摘　　要：脉冲喷吹清灰进行滤筒的再生是实现除尘器稳定、高效、长期运行的必要环节,对滤筒脉喷清灰性能的研究具有重要意义。目前,对脉喷过程的数值模拟普遍基于干净的滤筒,负载尘饼对喷吹过程的影响尚考虑不足。以滤筒除尘器装置为研究对象,考察滤筒负载尘饼对脉冲喷吹性能的影响,建立了脉冲喷吹的CFD数值模型用其对清灰流场进行模拟,并进行了实验验证。结果表明:脉冲喷吹压力在滤筒内自下而上蓄积,滤筒尘饼负载量越多,则滤筒内部蓄积的压力越大、喷吹强度越高、均匀性越好、穿过滤筒的喷吹气流越少;与固定尘饼负载量(喷吹过程尘饼不剥离)相比,考虑尘饼剥离的情形下脉喷后期的气流出现了明显上升;尘饼剥离条件下的脉喷性能介于尘饼负载固定与干净滤筒二者之间,且相对接近于尘饼负载固定的情形。以上结果可为脉喷清灰除尘器的设计提供参考。Pulse-jet cleaning for filter cartridge regeneration is essential to realize stable,effective,and longterm operation of dust collectors.Numerical studies on pulse-jet cleaning are commonly based on clean filters and give insignificant consideration of the impact of dust cake loaded on the filter cartridge on the cleaning.To address this,this work investigates the effect of dust cake loaded on the filter cartridge on the performance of pulse-jet cleaning.A CFD numerical model for pulse-jet cleaning was established to simulate the jet airflow field,which is verified by an experiment.Results show that the pulse jet pressure accumulated from the bottom to the top of the filter cartridge.With more dust cake covered on the filter cartridge,higher pressure inside the filter cartridge,greater pulse-jet cleaning intensity,better uniformity,and decreased pulsed jet airflow penetrating the filter were observed.Compared to the case whereby the dust cake was fixed(not peeled off during the pulse-jet cleaning process),the airflow obviously increased in the later period of pulse jetting by considering dust cake peeling off during cleaning.The pulse-jet cleaning performance by considering the dust cake peeling off was between those with fixed loaded dust cake and with clean filter cartridge and closer to the former case.This study can provide references for the design of pulse-jet cleaning dust collectors.

关 键 词：除尘器 滤筒清灰 脉冲喷吹 尘饼 数值模拟 计算流体力学 

分 类 号：X513[环境科学与工程—环境工程]