Air Filtering Shaker Type Dust Collectors

Oleg Systems Co. makes different types of industrial dust collecting systems. Dust collecting 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 Canadian Air Systems Fabric Dust Collector.

In fabric type dust collector one of the most important design tasks is to arrnage an effective method of filter cleaning. Generally, large dust collection installations are comparmented and use off-line filters cleaning.

When a single dust collector compartment is needed to be cleaned off line during working shift change or breaks, shaker type fabric filters are usually the least expensive choice. The fabric media is a shaker-type fabric filter, whether formed into cylindrical tubes or rectangular envelopes, is mechanical agitated to remove the dust cake.

If the fabric filter can not be stopped for cleaning, the dust collector is divided into a number of independent sections that are sequentially taken off line for cleaning. Because it is usually difficult to maintain a good seal with dampers, relief dampers are often included. The relief dampers introduce a small volume of reverse gas to keep the gas flow at the fabric suitable for dust cake removal. Use of comaprtments, with their frequent cleaning cycles, does not permit a substantial increase in flow rates over those of a single-compartment unit cleaned periodically. The best situation for fabric reconditioning is when the system is stopped because even small particles will then fall into the hopper. Continuosly cleaned dust collecting units have compartment valves that close for the shaking cycle.

The gas-to-media ratio for a shaker-type dust collector is usually in the range of 2 to 4 ppm; it might be lower for the collector filters particles that are predominantly smaller then 2 microns. The abatement of metallurgical fumes is one example where a shaker collector is used to control particles that are less than one micron in size.

For ambient air temperature application, a wooven cotton or polupropylene fabric is usually selected for shaker-type fabric filters. Synthetics are chosen for their resistance to elevated temperature and to chemicals.

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.

Some spesific types of Fabric Dust Collectors engineered by Oleg Systems Co. are:

* INTERMITTENT DUTY FABRIC DUST COLLECTORS

* MULTIPLE-SECTION, CONTINUOUS DUTY, AUTOMATIC FABRIC DUST COLLECTORS

* REVERSE-JET, CONTINUOUS-DUTY, FABRIC COLLECTORS

* REVERSE-FLOW COLLAPSE, CONTINUOUS DUTY DUST COLLECTORS

For additional information please refer to http://olegsystems.com/airknife/Index.html

Oleg Chetchel
Engineer of Industrial Air Moving Systems
Oleg Systems Co.
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