Particulate Matter (PM) pollution is an alarming environmental problem and one of the most used PM control devices in industry is fabric filter, with a pulse-jet cleaning system. A better understanding of the flow behavior of such pulse-jets is essential to improve cleaning efficiency and diminish dust emissions. Therefore, the present study aims to analyze the flow patterns of the cleaning pulse of an industrial-scale bag filter, with high-pressure and low-pressure systems, using transient three-dimensional CFD simulations. The results show that the center bags in a row take slightly higher shares of air volume and the larger part of it is due to secondary flow. The simulations also give insights into the degree of centralization of the jets: misalignment is progressively reduced along the purge tube, being less pronounced in the high-pressure than in the low-pressure system. Although the mass flow is higher in the high-pressure system, the distribution of the flow among the bags is relatively uniform and similar for both systems.Implications: This work shows, through simulations, that the behaviour of the air pulse during the cleaning is not uniform. There is a variation of the pulse along the duct, due to the movement of the wave that is formed. Besides wave intensity and pressure, the position and shape of the cleaning nozzle also affects the air pulse.

中文翻译：

---

织物过滤器脉冲喷射清洗的流量分布和喷射行为分析。

颗粒物（PM）污染是一个令人担忧的环境问题，工业上最常用的PM控制设备之一是带有脉冲喷射清洁系统的织物过滤器。更好地了解此类脉冲喷头的流动特性对于提高清洁效率并减少粉尘排放至关重要。因此，本研究旨在使用瞬态三维CFD模拟来分析具有高压和低压系统的工业规模袋式除尘器清洁脉冲的流动模式。结果表明，连续排中的中间袋所占的风量份额略高，而较大部分是由于二次流动。这些模拟还提供了射流集中程度的见解：沿着吹扫管逐渐减少了对准误差，与低压系统相比，高压下的压力不那么明显。尽管在高压系统中质量流量较高，但对于两个系统来说，袋子之间的流量分布相对均匀且相似。含义：这项工作通过仿真显示，清洁期间空气脉冲的行为是不统一。由于形成的波的运动，沿导管的脉冲会发生变化。除了波强度和压力外，清洁喷嘴的位置和形状也会影响空气脉冲。清洁期间空气脉冲的行为不均匀。由于形成的波的运动，沿导管的脉冲会发生变化。除了波强度和压力外，清洁喷嘴的位置和形状也会影响空气脉冲。清洁期间空气脉冲的行为不均匀。由于形成的波的运动，沿导管的脉冲会发生变化。除了波强度和压力外，清洁喷嘴的位置和形状也会影响空气脉冲。