Operation and maintenance of the self-cleaning filter in air compressors
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The self-cleaning filter cartridges of air compressors are backblown with 0.4–0.5 MPa of instrument air, but the self-cleaning effect seems inadequate; therefore, the cartridge is removed periodically to manually blow out and clean the accumulated dust. Dear masters and friends, how did you do it?
It doesn’t seem like there’s a very good solution; the best approach would be to modify the air supply source. We faced the same problem at first, and later we switched to instrument air, with a pressure of around 8 kilograms – the pressure after passing through the molecular sieve was too low
This post was last edited by wbzzip on 2010-9-2 at 19:50. Is it a high-precision filter element, and is the level of air impurities in the environment too high? The backflow pressure can be increased appropriately; with a precision of 5 microns, a backflow pressure of over 6 kilograms generally yields good results. It can also be set to timed backwashing, with the backwashing time adjusted to be shorter – about one minute is sufficient.
This post was last edited by wdt817 on 2010-9-2 at 21:15. The backflush pressure can be increased to 0.75–0.85 MPa; raising the backflush gas pressure is one approach. Another option is to add a layer of composite fiber non-woven filter material outside the coarse filter screen of the filter, which can prevent larger dust particles from passing through (achieving a G4 filtration efficiency). Thanks to the filtering action of this composite fiber non-woven filter material, the load associated with the backflushing and self-cleaning process of the filter cartridge is reduced, the thickness of the dust layer on the filter elements is decreased, and thus the service life of the filter cartridge is extended (the normal service life of the filter material is 3–6 months)
It can be purged with gas from a nitrogen compressor, with the pressure adjusted to around 8 kilograms
As mentioned above, it’s fine to add another layer of composite fiber filter media, as well as to increase the pressure used for backwashing; however, this pressure shouldn’t be too high, as that would shorten the lifespan of the filter cartridges! Shorten the backflush cycle! That will make things better!
We use nitrogen from a medium-pressure nitrogen tank for backwashing at a pressure of around 0.65 MPA, with backwashing carried out periodically for 1 minute each time; this method yields good results. The filter elements need to be replaced every two years or so (usually after about 100 cycles), or they can be removed manually to clean the dust before being put back in place. If the effect is not satisfactory, it’s necessary to replace the filter elements altogether. It’s best to use waterproof filter paper. The pressure difference is around 90 when it’s high, and about 50–60 under normal conditions. During periods of high humidity, such as in the rainy season, manual backwashing several times on site also gives good results. Ultimately, it depends on the local dust and mechanical impurity levels; moreover, the number of filter elements used can be increased slightly
The original poster has done an excellent job; there’s no better way than yours. Believe in yourself. Increasing the backflow pressure is certainly good, but removing the backflow method yields even better results.