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Dust Dislodgement from Woven Fabrics Versus Filter Performance

1978; Taylor & Francis; Volume: 28; Issue: 1 Linguagem: Inglês

10.1080/00022470.1978.10470563

2376-6107

Richard Dennis, Reed W. Cass, R.R. Hall,

Vibration and Dynamic Analysis

The results of special field, pilot, and bench scale studies have provided a rational basis for estimating woven fabric filter performance. Measurement of the amount and distribution of residual dust upon cleaned fabrics permits an accurate prediction of intermediate and final filtration parameters for cleaned and uncleaned regions of the fabric during subsequent filtration cycles. The predictive method is based upon the fact that dust dislodgement occurs at the dust/fabric interface in the form of flakes or slabs and not by surface spalla-tion. Since any cleaned filter possesses at least two distinct surfaces (cleaned and uncleaned) having characteristic drag values, the temporal and areal variations in deposit density, cloth velocity, resistance, and dust penetration must be computed on the basis of a parallel flow system. The cleaned area fraction depends upon the type and intensity of the cleaning. Comparison between experimental and predicted performance indicated excellent agreement for glass fabric/fly ash systems. The nonuviiform residual dust deposits also account for the variability in reported values for the dust specific resistance coefficient. The analytical concepts apply not only to filtration systems for fly ash, but also to any fabric/dust combination cleaned by mechanical shaking and/or bag collapse with reverse flow.