C.R. de Lacerda, P. Bächler, A.D. Schwarz, R. Sartim, M.L. Aguiar, A. Dittler

Chemical Engineering & Technology, 2022, 45, No. 7, 1354-1362, https://doi.org/10.1002/ceat.202200132

Surface filters are widely used in industrial gas cleaning, e.g. as filter bags, to meet particle emission standards. The seam created by manufacturing the filter element is potential leakage point for dust. The paper presents a systematic investigation on the impact of the needle diameter of the seam on filter operation in two different filter test rigs, regarding differential pressure and particle emissions. Four membrane samples, one without seam and three sewn with different needle diameters, were used to evaluate the fractional separation efficiency and the dust emissions. While the sample without seam showed near-perfect particle separation, an increase in needle diameter led to an increase in dust emissions. The impact of needle diameter on the differential pressure was negligible.