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Industrial Vacuum Specifications
Separator Receivers:
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Industrial Vacuum Specifications
Separator Receivers:
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Question One: Is a Pulse Jet Filter suitable for this application? A pulse jet filter is used for dry powders where the grain loading is very high, and where filter cleaning is required as the system runs to ensure reliable performance. However, if the material is wet, or sticky, or light and fibrous, or if the amount of material is small compared to the air flow (low grain loading), then a pulse jet is NOT appropriate. Question Two: What are some tips on sizing? The characteristics of the material determine the selection of a pulse jet filter separator. You need to consider particle size and density (and a number of other factors, but this is just an intro!) Since we use ultra high efficient filtration media almost exclusively, we will use sizing based on this media. Separators that use other media will use other rules! Particle size is important because the efficiency of any filter media decreases as air flow through it increases. That's why the industry refers to an "air to cloth ratio": the amount of air flowing through a given area of filter - we use cfm: sq. ft. We use ACFM not SCFM when determining this ratio, because it is the higher number. (Not sure what the difference is? Click here) For carbon black, pigments and other sub-micron fines, use 2 acfm per sq. foot of media. For particulate up to 20 microns, use 3 : 1, and for particulate above 20 microns, use up to 10 : 1 depending on the density. Density is important because the efficiency of the pulse jet cleaning mechanism decreases as the "can velocity" increases. In a high vacuum type baghouse dust collector, "can velocity" is the upward flow of air through the filter section. If the flow is too high, material blown off the bags by the pulse gets re-entrained and the filters can't keep themselves clean. Use ACFM divided by the cross sectional area of the separator to get a FPM (feet per minute) velocity. For material less than 5 pounds per cubic foot, be very careful! Use a can velocity under 30 feet per minute. (There are cheats for this stuff, you'd better call us.) For material up to 50 p/cf. use a can velocity up to 100 fpm. Rarely does a separator with a can velocity over 150 fpm work well. Note that usually the air to cloth sizing gets you a choice of two or three, and the density tells you if you can choose the smaller of the choices.
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