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Membrane Chamber Plates


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Function of the Membrane Chamber Plate


The filtration process by using JVK membrane chamber plates does differ remarkably from the normal filter press package (chamber plates or plates and frames). The most important proces steps are described below and explained by some graphics. Detailed description and further operating directions can be learned from the operating instructions.
  1. Filtration / feeding of filter press
  2. Washing through feed port (gap washing)
  3. Pre-Squeezing and washing through corner channels
  4. Squeezing of filter cake
  5. Blowing off the filter cake

1. Filtration / Feeding of Filter Press


During feeding the filter press the elastic membranes join in a most uniform way, and with lowest tension to the core plate. Press feeding is finished immediately after filtration yield obtained the optimal working point "A". Therefore - contrary to chamber plates - the filtration will be finished prematurely at lower pressure. It must be noted that the filter cake thickness after squeezing is less than the chamber depth. Most optimal data for a suitable design can be achieved by test filtration on the JVK trial filter press either at JVK's plant or at site.


quadratResidual moisture after the filtration with membrane chamber
Restfeuchte

A = End of filtration with membrane chamber plate

B = End of filtration with chamber plates

C = Residual cake moisture after the squeezing with membrane chamber plate

A`und C`are possible product dependent operating values.

The optimal operating condition A can be determined after a few filtration cycles. Cake compressibility, filtercloth, pump capacity etc. will influence the process optimisation.



2. Washing through Feed Port (Gap Washing)


After finishing the filtration the cake layers can be washed through the feed port. No squeezing and no overfilling is allowed in this case.


3. Pre-Squeezing and Washing through Corner Channels


During the following washing the cake is fixed in the chamber plate by squeezing under low pressure and any cracks resp. gaps are avoided.
Depending on channel arrangement and / or requested washing effects the following versions are possible with JVK membrane chamber plates:

  • Washing in one direction
  • Washing in alternating directions
  • Washing from top to bottom or from bottom to top (flooded)


4. Squeezing of Filter Cake


Depending on structure and quality of the filter cake most of the liquid, still remaining in the cake after filtration or washing get, displaced by the membrane pressure. The result is a very low residual moisture content. The squeezing pressure is normally higher than the pre-squeezing pressure.


5. Blowing-off the Filter Cake


With regard to most permeable cakes the blow-out by squeezing pressure through corner ports can lead to an additional effective reduction of cake moisture.

filtrierenwaschenwaschenabpressen

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