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Dust Collectors - Pulse Jet Type

Date Added: February 16, 2012 08:08:57 PM
Author: Oleg Tchetchel
Category: Business & Economy: Classifieds

NIS Co. is an engineering company that engineers industrial dust collectors. Dust collection equipment is available in numerous designs utilizing a number of principles and featuring wide variation in effectiveness, initial cost, operating and maintenance expense, space, arrangements and material of construction. One of the most widely used type of dust collector is Pulsee Jet Dust Collector. Pulse Jet collapse cleaning is generally used with glass media which is fragile and requires a gentle cleaning technique. Reversing the glass flow provides a gentle collapse of the fabric usually in a "four point star" braking the dust cake which falls by gravity into the hopper. Efforts to decrease fabric filter sizes by increasing the flow rates through the fabric have concentrated on methods of implementing frequent or continuous cleaning cycles without taking major portions of the filter surface out of service. In the pulse-jet dust collector design, a compressed air jet operating for a fraction of a second causes a rapid vibration or ripple in the fabric which dislodges the accumulated dust cake. Simultaneously, outflow of both compressed cleaning air and entrained air from the top clean air plenum helps top sweep pulsed-off dust away from the filter surface. The pulse jet dust collector design is used predominantly because it is easier to maintain than the reverse jet system and because pulse jet dust collectors can be smaller and less costly due to greater useful cleaning energy makes operation with higher fitration velocities practical. In NIS Pulse Jet Dust Collector the tubular bags are supported by wire cages during normal operation. The reverse flow pulse breaks up the dust layer on the outside of the bag, and the dislodged material eventually falls to a hopper. Filtration velocities for reverse jet or pulse jet dust collector designs range from 5 to 15 fpm for favorable dusts that require greater fabric area for many materials that produce a low-permeability dust cake. Felted fabrics are generally used for these designs because jet cleaning opens the pores of woven cloth and produces excessive leakage through the filter. Fabric arresters are high efficiency, medium cost collectors. The effectiveness of passing air or gas through a fabric at low velocity has been recofnized and used for many years in air cleaning devices. Fabric is arranged in envelope or tubular (stocking) shapes. While removal appears to take place by a staining action of the media, in reality dust collection is obtained by building up a mat of the material on the dirty side of the media. This mat provides the actual filtering or straining bed. By means of this bed a high degree of removal is obtained even on sub-micron size particles. The dust collectors are used extensively in industry for a wide range of applications. They require more space than most other types of air cleaning devices, necessiating outdoor installation in most cases. For additional information please refer to http://nis-co.com. Oleg Tchetchel Industrial Air Systems Designer Northern Integrated Systems http://nis-co.com/contact/Index.html http://www.nis-co.com/Index.html
 
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