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Oleg Systems Co. is a design and engineering for industrial dust collectors and dust collection systems. Dust collection equipment is available in numerous designs utilizing a number of principles and a wide variation in effectiveness, initial cost, operating and maintenance costs, space, media and construction materials.
The dust collectors are widely used in industry for a wide range of applications. It takes more space Many other types of air cleaning devices, necessiating outdoor installation in most cases. One of the most widely used types of collector fabric dust collector is dust.
Fabric arresters are high efficiency, average cost collectors. The effectiveness of passing air or gas through a fabric at low speed and recofnized is used for many years in air cleaning devices. Fabric is arranged in envelope or tubular (average) methods. The removal appears to have place by a staining action of the media in the collection of the reality of powder is obtained by creating a mat of material on the side dirty media. This rug offers filtering or straining bed. Through this bed a high degree of removal is obtained even in particle size sub-micron.
As dust is collected in the fabric, the resistance of air flow increases. Periodically the fabric must be reconditioned by shaking, vibration, reverse jet or reverse-flow collapse which agitates suffitiently to eliminate most of the adhering material allowing it to fall into the dust hopper. In most collectors Air flow should be stopped during reconditioning, otherwise released material is re-entrained and redeposited on the web. Sufficient dust must adhere to the tissues to maintain the dust mat needed for maximum efficiency; therfore, after refurbishing the pressure drop will be much greater than the loss through new tissue. Periodic cleaning of the filter media is one of the most important tasks in the design of dust collector. Reverse cleaning flow are generally chosen when the volumetric flow of gases is very large.
This cleaning method does require a design beacause compartment reverse current required to close the dust drag bags to be returned to magazines online filrh tissue compartment is equipped with a main shutoff valve and gas valve Conversely, if the system is blown through or through elaborate. A secondary fan and duct system is required to reverse the flow of gas in the compartment bcleaned. When an insulated compartment for cleaning, the gas circuit thickened reverse flow and dust loading through active compartments of the headers.
The tissue medium is reconditioned by the change in direction of flow through the bags, some of which the collapse. After cleaning, reproduction gas revealed that the dust falls into the hopper.
Reverse flow cleaning reduces the number of parties phones in the fabric filter system – an advantage of maintenance, especially when cleaning large volumetric flows. However, cleaning or replacement, less stronger than other methods, and the resistance of the material is greater risidual reconditioned. Reverse flow dust collector cleaning is especially suitable for fabrics such as cloth glass, which require gentle cleaning. Reverse flow dust collection bags are usually 8 to 12 inches in diameter and 22 to 33 feet long and are run at low speeds in the range of 2 to 4 feet per minute. As a result, reverse air dust collectros tend to be considerably larger than the design of the dust collector pulse jet capacity similar.
Ambien For air applications, a cotton wooven polypropylene fabric is the usual selection for reverse flow cleaning. For temperatures higher wooven polyester, fiberglass, fabric or brand is often used. In recent years glass cloth has come into use because of all treatment Silicone glass fibers and the use of reverse flow techniques for cleaning. Silicone treatment provides a lubricant between the fibers and increases the life of the fabric.
Reverse flow dust collectors is limited to dry air conditions enough to prevent condensation or moisture-free storage on the web. With hygroscoping materials, there will be a trend of union between the particles and fabric under high relative humidity, even when condensation takes place. Temperature maximum recommended for cotton fabric is 180 F, 200 F. wool Higher temperatures can be managed through the use of synthetic materials like nylon or tissue orlon and the glass cloth and occasionally fine wire mesh. The synthetic fabrics mau be used up to 300 F while glass cloth is acceptable to 550 F.
Flow rate through the media varies with the type of dust collector, application and dust concentration. Ratings are usually selected for the pressure drop should not exceed 5 "WG. The smaller the particle, the faster the increase in resistance for a given load. For the same flow air and dust burden, increasing drag increases in direct proportion to time.
For additional information please go to http://www.olegsystems.com/dustcollector/Index.html.
Oleg Chetchel
Process design and Air Systems Engineer
Oleg Systems Co.
href = "http://www.olegsystems.com/fumeextractor/Index.html"> http://www.olegsystems.com/fumeextractor/Index.html
target = "_blank" href = "http://www.olegsystems.com/aircurtain/Index.html"> http://www.olegsystems.com/aircurtain/Index.html
About the Author:
Oleg Chetchel
Ventilation Equipment Designer
Tenderall Fan Co.
http://tenderall.com
Article Source: ArticlesBase.com – Air Filtration by Reverse Flow Dust Collectors
