School of Safety Engineering, China University of Mining and Technology, Xuzhou, China.
School of Safety and Management Engineering, Hunan Institute of Technology, Hengyang, China.
PLoS One. 2023 Feb 21;18(2):e0282026. doi: 10.1371/journal.pone.0282026. eCollection 2023.
Pressure drop is an important indicator that affects the filtration performance of the pleated filter, and the deposition of dust particles within the pleats is crucial to the evolution of the pressure drop. In this study, the pressure drop during PM10 loading process was investigated for a series of V-shaped and U-shaped filters with a pleat height of 20 mm and different pleat ratios (the ratio of pleat height to pleat width: α = 0.71-3.57). In the numerical simulations, numerical models suitable for different pleated geometries were obtained through experimental verification on the local air velocity. Then, assuming that the dust cake thickness is proportional to the normal air velocity of the filters, the variation of the pressure drop with the dust deposition is derived by means of successive numerical simulations. This simulation method saved a significant amount of CPU time required for the growth of dust cake. It was found that the relative average deviations between experimental and simulated pressure drops were 3.12% and 1.19% for V-shaped and U-shaped filters, respectively. Furthermore, it was found that under the same pleat ratio and the mass of dust deposition per unit area, both the pressure drop and unevenness of normal air velocity of the U-shaped filter were lower than the V-shaped filter. Therefore, the U-shaped filter is recommended due to its better filtration performance.
压降是影响褶皱滤器过滤性能的一个重要指标，褶皱内粉尘颗粒的沉积对压降的演变至关重要。本研究针对褶高为 20mm、褶比（褶高与褶宽之比：α=0.71-3.57）不同的一系列 V 形和 U 形褶皱滤器，研究了 PM10 加载过程中的压降。在数值模拟中，通过对局部空气速度进行实验验证，获得了适用于不同褶皱几何形状的数值模型。然后，假设粉尘饼厚度与滤器的法向空气速度成正比，通过连续的数值模拟推导出压降随粉尘沉积的变化。该模拟方法节省了粉尘饼生长所需的大量 CPU 时间。结果发现，V 形和 U 形滤器的实验压降与模拟压降的相对平均偏差分别为 3.12%和 1.19%。此外，发现相同的褶比和单位面积沉积的粉尘质量下，U 形滤器的压降和法向空气速度不均匀性均低于 V 形滤器。因此，U 形滤器因其更好的过滤性能而被推荐。
