Filter cartridges are widely applied in the industrial dust removal system, and pleat structure plays a major role in expanding the filter area in limited space. In this study, the effect of pleat ratio (the ratio of pleat height to pleat pitch) on the effective filtration area (EFA) during polydisperse dust loading was analyzed. The results indicate that the dead zone formed by pleating will increase the structural resistance and reduce the EFA. When pleat ratio is 0.74–1.48, the EFA percentage varies slightly with the dust deposition per unit area (DDPUA). When pleat ratio is 2.22–3.70, the EFA percentage decreases with the increase in DDPUA. The threshold friction velocity surges with the decrease of dust particle size, and the larger the pleat ratio, the more easily for larger dust particles to deposit at the pleat corners, leading to the reduction of the EFA percentage decreasing rate.

滤筒广泛应用于工业除尘系统中，褶皱结构对在有限空间内扩大过滤面积起到主要作用。在本研究中，分析了多分散粉尘加载过程中褶皱比（褶皱高度与褶皱间距之比）对有效过滤面积 (EFA) 的影响。结果表明，褶皱形成的死区会增加结构阻力，降低EFA。当褶皱比为 0.74-1.48 时，EFA 百分比随单位面积灰尘沉积量 (DDPUA) 略有不同。当褶皱比为 2.22-3.70 时，EFA 百分比随着 DDPUA 的增加而降低。阈值摩擦速度随着粉尘粒径的减小而增大，褶皱比越大，较大的粉尘颗粒越容易沉积在褶角处，