Packed bed filter

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A packed bed filter is in the fluid technology , a filter , wherein the filter medium is not of a continuous material, but of a loose bed is.

Layout and function

Packed bed filters consist of granular material through which the fluid to be cleaned flows. They are mainly used for depth filtration . The additional formation of a filter cake leads to a further improvement in cleaning performance.

Bulky bed filters can be designed as fixed bed filters with static bulk, moving bed filters with moving bulk or fluidized bed filters with flow-borne bulk. Moving bed and fluidized bed allow continuous operation, while in the case of the fixed bed the supply of raw gas has to be interrupted during the regeneration process. Fixed bed filters are used in both surface and depth filtration.

As a deposition mechanisms essentially act

The filter can be cleaned by backwashing. This is mainly used with packed bed filters for cleaning liquids.

One advantage of packed bed filters is that wear-resistant materials such as rocks can be used as filter material. In addition, bulk bed filters can be used for gas filtration at high temperatures and aggressive atmospheres using suitable bulk material . They can also be used when there is a risk of falling below the dew point and glowing fires. Undesired gaseous components, such as sulfur dioxide and hydrogen chloride in gas cleaning , can be removed from the fluid by means of sorption .

Disadvantages are, among other things, the lower degree of separation compared to other types of filters and the greater expense involved in disposal .

Classic fields of application of packed bed filters are the cement , lime and metallurgical industries .

Individual evidence

  1. ↑ a b VDI 3677 sheet 2: 2004-02 Filtering separators; Depth fiber filters (filtering separators) . Beuth Verlag, Berlin. P. 27.
  2. ↑ a b c Matthias Stieß: Mechanical Process Engineering 2 . Springer-Verlag Berlin, Heidelberg, New York, 1994, ISBN 3-540-55852-7 , p. 29.
  3. ^ A b Franz Joseph Dreyhaupt (editor): VDI-Lexikon Umwelttechnik. VDI-Verlag Düsseldorf, 1994, ISBN 3-18-400891-6 , p. 1045.
  4. ^ A b Franz Joseph Dreyhaupt (editor): VDI-Lexikon Umwelttechnik. VDI-Verlag Düsseldorf, 1994, ISBN 3-18-400891-6 , p. 55.
  5. ^ Gabriel I. Tardos: Separation of Airborne Dust in Deep-Bed Filtration. In: Kvetoslav R. Spurny : Advances in Aerosol Filtration. Lewis Publishers, Boca Raton 1998, ISBN 0-87371-830-5 , p. 245.
  6. ^ A b Friedhelm Sporenberg, Ekkehard Weber, Siegfried Goetsch: Investigations into the separation of dusts with bulk bed filters. In: Dust - cleanliness. Air . 42, No. 2, 1982, ISSN  0949-8036 , pp. 43-47.
  7. ↑ Matthias Stieß: Mechanical Process Engineering 2 . Springer-Verlag Berlin, Heidelberg, New York, 1994, ISBN 3-540-55852-7 , p. 138.
  8. ↑ Harald Hoffmann, Michael Brachthäuser: New kind of packed bed filter for hot gas cleaning. In: Chemical Engineer Technology . 60, No. 1, 1988, ISSN  0009-286X , pp. 36-38.
  9. ↑ VDI 3677 sheet 1: 2010-11 Filtering separators; Surface filters (Filtering separators; Surface filters) . Beuth Verlag, Berlin. P. 24.
  10. ↑ Wolfgang Peukert , Friedrich Löffler : For the separation of dust and gaseous pollutants in a packed bed filter. In: Dust - cleanliness. Air. 48, No. 10, 1988, ISSN  0949-8036 , pp. 379-386.