The accurate determination of physical properties of filtration media is essential for predicting their performance for bag filtration use. The spatial distributions of fiber mass, air permeability, and thickness of three commercially available filtration media were evaluated and compared with the manufacturer's indicated values. The fiber mass and air permeability were distributed over a wide range, resulting in a large deviation from the indicated values. The filter efficiencies were measured for ten randomly sampled pieces from each filter, and the filter efficiency of the whole filtration media and particle emission rate were estimated. Even for filters with a fiber mass and air permeability close to the indicated values, their filter performances differed by approximately 15 %.

中文翻译：

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无纺布袋式除尘器中纤维质量，透气度和过滤效率的分布

准确确定过滤介质的物理性质对于预测其在袋式过滤用途中的性能至关重要。评估了三种市售过滤介质的纤维质量，透气性和厚度的空间分布，并将其与制造商的指示值进行了比较。纤维质量和透气度分布在较宽的范围内，导致与指示值的较大偏差。从每个过滤器中随机取样十片，测量过滤器效率，并估算整个过滤介质的过滤效率和颗粒排放率。即使对于纤维质量和透气率接近指示值的过滤器，它们的过滤器性能也相差约15％。