Product category:
Air handling: Dust + Fume extraction
News Release from: Donaldson Membranes | Subject: Guide to the selection of filter media
Edited by the Processingtalk Editorial
Team on 30 January 2006
A guide to the selection of filter media
A baghouse filter is a dust removal device employing a fabric which acts as a barrier to remove particulate from a gas or liquid stream: this free guide from Donaldson shows how to select the fabric
A baghouse filter is a dust removal device employing a fabric which acts as a barrier to remove particulate from a gas or liquid stream It can contain anything from a few to many thousands of metres of fabric
This article was originally published on Processingtalk on 11 Mar 2008 at 8.00am (UK)
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Filterbags are a vital part of an industrial separation process therefore selecting the right product is of paramount importance.
Although they normally account for a relatively small part of the total cost of the collector system they are one of the most critical factors governing success.
Many factors must be taken into consideration in filtration, most importantly that the filter media is capable of retaining solid particles within an application but still allows a gas or liquid to pass through.
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Emissions of pollutant dusts and fumes to the environment and the workplace are subject to ever more stringent legislative control and scrutiny which has driven the demand for more efficient and effective filter media.
Dust and fumes, toxic or not, must be removed to protect health and the environment.
In some cases the solid particulate carried in the gas or liquid flow represents a useful or valuable product, which must be efficiently separated or filtered for final use or further processing.
The choice of media for a given filtration application is determined by the environment in which the filtration will take place.
1 Temperature: with filtration applications are sub-divided into two groups: low temperature filtration (milling, grinding, mixing and bagging operations) and high temperature filtration (utility boilers, incinerators, dryers or kilns).
2 Adverse gas and chemical conditions: Ability of the fabric to resist degradation from expected levels of acids, alkalis, solvents and oxidising agents.
3 Humidity: Resistance to Hydrolysis at expected temperature and humidity levels.
4 Dimensional stability: the fabric must be expected to resist shrinkage and stretching at the expected temperatures and gas conditions.
5 For retrofit, history of existing application.
Donaldson Membrane's Tetratex Microporous ePTFE membrane filter media has a proven track record as a very high efficiency, highly effective fabric filter media, with several different membrane types available to achieve, subject to various parameters, the desired performance: Tetratex, Tetratex Release, High Efficiency and Ultra High Efficiency.
These high performance laminates supply superior dust cake release, low pressure drop, higher air flow, and high efficiency.
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