Study on influence of non-uniform permeability on filtration velocity distribution of filter bag surface

doi:10.16265/j.cnki.issn1003-3033.2025.07.1188

Abstract

Abstract:

In order to address the issue of uneven filtration velocity distribution on the filter bag surface in a baghouse dust collector, a new design method for filter bags with non-uniform permeability was proposed. Using Fluent software and User-Defined Function (UDF), the impact of non-uniform permeability on the filtration velocity distribution across the bag surface was simulated under the design filtration velocity condition (1.0 m/min). The results indicate that the filtration velocity of uniformly permeable filter bags gradually increases along the axis of the bag from bottom to top, and the uniformity of filtration velocity distribution decreases with the increase in bag length. By optimizing the permeability of filter bags with different lengths of 5, 7 and 10 m, the maximum filtration velocity on the surface of filter bags is reduced from 1.60, 2.32 and 3.34 m/min to 1.30, 1.31 and 1.38 m/min, respectively. Moreover, the uniformity index of filtration velocity distribution on the surface of the filter bag is significantly improved, from 0.736, 0.459, 0.210 to 0.854, 0.868, 0.892, respectively.

Key words: baghouse dust collector, filter bag surface, filtration velocity, non-uniform permeability, uniformity index

CLC Number:

X964工业防尘

YANG Honggang, LI Ao, CAO Yingxue, MENG Xiaojing, WANG Jinxiao. Study on influence of non-uniform permeability on filtration velocity distribution of filter bag surface[J]. China Safety Science Journal, 2025, 35(7): 91-97.

Figures/Tables 10

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工况	3 m(Case1)		10 m(Case3)		12 m(Case5)		15 m(Case7)
来源	PARK等^[8]	本文	PARK等^[8]	本文	PARK等^[8]	本文	PARK等^[8]	本文
试验值/Pa	24.0	—	90.0	—	140.0	—	150.0	—
模拟值/Pa	22.3	22.9	83.7	94.6	147.5	138.1	162.0	164.7
相对误差/%	7.08	4.58	7.00	5.11	5.36	1.36	8.00	9.80

工况序号	L/m	v₀/ (m·min^-1)	过滤面积/ m²	过滤风量/ (m³·s^-1)	入口速度/ (m·s^-1)	α/m²
1	5	1	2.45	0.040 8	0.13	4.30×10^-11
2	5	1	2.45	0.040 8	0.13	式(9)
3	7	1	3.43	0.057 2	0.18	4.30×10^-11
4	7	1	3.43	0.057 2	0.18	式(10)
5	10	1	4.90	0.081 6	0.26	4.30×10^-11
6	10	1	4.90	0.081 6	0.26	式(11)