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Dust bag filter and stable unstable filtration comparison

2012/4/26 19:29:16
Dust bag filter and stable unstable filtration comparison

Dust bag filter in the filtration process with time series can be divided into two stages, namely, stable and unstable filtration stage filter. Dust bag bag filter is the heart, commonly known as dust bag or dust bag, dust bag is a bag type dust collector key part in the process of operation, usually cylinder type filter bag vertically hanging in the dust remover.

In the pulse and box impulse precipitator, dust is attached to the outer surface of the filter bag. Dust contained gas through the filter, the dust is trapped in the filter bag outer surface, but the clean gas through the filter into the inner filter bag. The filter bag inside the cage frame used to support the filter bag filter bag, prevents the collapse, simultaneously it is helpful to the dust cake elimination and distribution.

Dust bag fabrics and design should try to pursue high efficiency filtration, easy to dust stripping and durable. Dust bag is very important to choose, it directly influences the effect of dust removal with dust bag, select from the following several aspects: selecting the gas temperature, humidity and chemical, particle size, dust concentration, filtration velocity, dust-cleaning mode etc..

In the stable filtration stage, hypothesis and law particle deposition generated on the filter structure transformation, particle and fiber contact and trapped, without considering the filtering mechanism of correction, therefore, trapping efficiency is not affected by the filtration time effects, along with filtration time increased, the fiber surface gradually formed particles lead to unstable filtration stage, filter cloth gap changes in the rate of particles formed by the deposition of the fiber collecting ability, resulted in trapping efficiency with filtration time and particle deposition amount increases. In a clean state, single fiber trapping efficiency is defined as the limit of the particle trajectory height with a fiber diameter ratio, in actual in the filtering process, decreases with the increase of time, fiber formation and dimensions are generated more obvious changes, the study shows that, in general, single fiber trapping efficiency with particles deposition increased linearly.

The above is the dust bag filter and stable unstable filtration, dust bag is used in industry more and more widely, understand its filtering stability is necessary, only the dust bag is known to make it play its due role.

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