This study has examined the relationship between filter performance and dust-cake formation. The latter is found to be dependent on filter structure and on electrostatic effects. An important feature of the dust cake is the distribution of mass with distance from the fabric surface. When the cake forms close to the upstream surface, lower dust retention and lower pressure drop result, as well as better capture efficiency. This upstream concentration of the dust cake can be achieved by proper choice of the fibers of which the filter is made, by certain layered constructions of the filter, and by application of an electric field at the filter surface.
Get full access to this article
View all access options for this article.
References
1.
Lamb, G.E.R., Costanza, P., and O'Meara, D., Electrical Stimulation of Fabric Filtration. Part II: Mechanism of Particle Capture and Trials with a Laboratory Baghouse, Textile Res. J.48, 566-573 (1978).
2.
Leith, D., Rudnick, S., and First, M., "High-Velocity, High-Efficiency Aerosol Filtration," EPA-600/2-76-020, January, 1976.
3.
Miller, B., Lamb, G.E.R., Costanza, P., and Craig, J., "Nonwoven Fabric Filters for Particulate Removal in the Respirable Dust Range," EPA-600/7-77-115, October, 1977.
4.
Miller, B., Lamb, G.E.R., Costanza, P., O'Meara, D., and Dunbar, J., "Studies of Dust Cake Formation and Structure in Fabric Filtration ," EPA-600/7-78-095, June, 1978.
5.
Zebel, G., Deposition of Aerosol Flowing Past a Cylindrical Fiber in a Uniform Electric Field, J. Colloid. Sci.20, 522-543 (1965).
