||Performance of a High-Velocity Pulse-Jet Filter, III.
Leith, David ;
Ellenbecker, Michael J. ;
First, Melvin W. ;
||Harvard School of Public Health, Boston, MA.;Industrial Environmental Research Lab., Research Triangle Park, NC.
Air pollution control equipment ;
Air filters ;
Performance evaluation ;
Dust collectors ;
Fly ash ;
Pulse jet filters ;
||Some EPA libraries have a fiche copy filed under the call number shown.
The report gives results of a continuing study of the performance of a high-velocity pulse-jet filter. Such filtration has distinct advantages over low-velocity filtration in that the equipment required to clean a gas stream is reduced in size and initial cost as filtration velocity increases. Although high filtration velocity brings on a number of problems, some of them can be dealt with using the information in this report. The study indicates that penetration by particle collection and subsequent seepage (not straight-through penetration) is the primary mechanism by which penetration occurs. A model is presented which encompasses both mechanisms. The model was useful in showing the general trends that should occur with changes in filter operating conditions, but additional information is required to test its ability to predict penetration. Tests were designed to measure the actual fraction of fly ash removed from a polyester felt under typical pulse-jet conditions. Test results showed that failure to remove dust with the cleaning pulse, as well as redisposition, contributed to high pressure drop in pulse-jet filters with nonwoven fabrics.