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Fig. 5.30: BOGE-Filter combination, Series AF
An active carbon filter with microfilter connected in series | After passing through high-performance filters and dryers, the technically oil-free compressed air still contains hydrocarbons and diverse odorous and taste substances.
There are many applications of pneumatics where these residues would lead to disruptions of production, adverse quality and unpleasant smells.
An active carbon filter removes the hydrocarbon vapours from the compressed air. The residual oil-content can be reduced to 0.005 mg/m³. The quality of the compressed air is better than that demanded for breathing air by DIN 3188. The condensated droplets of oil are already removed by the series-connected filter (BOGE-Microfilter Series F).
Operating principle
The filtration of compressed air by absorption is a purely physical process. The hydrocarbons are bound to the active carbons by powers of adhesion (uneven molecular attraction). Chemical compounding does not take place in this process.
The dried and pre-filtered compressed air is directed through a pleated active carbon filter element. The appearance of this filter element is similar to that of the microfilter. As with the microfilter, the compressed air is directed through the filter element from the inside towards the outside.
Features
- Pre-filtration.
An active carbon filter must always be connected upstream from a high-performance filter and a dryer. Unfiltered compressed air destroys the adsorbant and reduces the filtration effect.
- No Regeneration.
The active carbon filling can not be regenerated. It must be replaced, depending on the degree of saturation.
- Working life.
The filter element of an active carbon filter must be replaced after approx. 300 - 400 hours of operation.
Areas of application
- Food and luxury food industry.
- Pharmaceuticals industry.
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