数值模拟滤筒中负载尘饼对脉冲喷吹清灰效果的影响

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...

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

Pulse-jet cleaning for filter cartridge regeneration is essential to realize stable, effective, and long-term 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.