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Membrane Plate Filter Press

Membrane plates filter presses are used since several years in the chemical, food and industrial industries. Nowadays this kind of filter presses is more and more used for any kind of materials (Dyes, Pigment, Pharmaceuticals, Edible Oil, quarries, urban and industrial sludge of any kind)

The outside sides of these plates are lined with a plastic or rubber membrane. Membrane filter plates have a chamber below the drainage surface that may be inflated. Membrane Filter press is generally used in mix-pack configuration of one companion plate (Recessed) and one Membrane plate. After a conventional filtration process in the filter press (feeding usually at pressure: 7 to 10 bars), the membranes are inflated by means of pressurized water or compressed air thereby squeezing the cakes all over their surface. The volume of the cake thus decreases and an additional volume of filtrate is extracted. The final filter cake is a result of squeezing by the membrane. The high pressure PP membrane plate is the latest and the most practical new type filter plate.

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Membrane Filter Presses Advantages

  • High productivity by shortening the filtration and washing cycle.
  • Effective filtration, washing and discharge time.
  • Lower cake moisture
  • Reduce drying cost of final product.
  • Reduction of washing liquid consumption due to more homogeneous cake structure.
  • Pip style drainage surface design for uniform flex.
  • Squeeze pressure up to 16 bars.
  • Large cross area of filtrate outlet
  • High elasticity of membrane
  • Many fields of application
  • Low power consumption.
  • Minimal maintenance requirements
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Low cake moisture content by pressure filtration can be achieved with recessed plates by high filtration pressure and long filtration time only. The membrane system requires much lower filtration pressure to fill the chambers The low cake moisture content is caused by squeezing with a flexible membrane. The production cycle is determined by

  • Fast feed of chambers at low filtration pressure
  • Cake squeezing in a few minutes

Or other process such as dry-blow,core blow and cake-wash(if any)

Application of squeezing pressure to filter cake by elastic membranes replaces the high pressure filtration phase of recessed plates. Advantages:

  • Remarkable reduction of residual cake moisture in short time
  • Shortening of total filtration cycle time.
  • increased filtrate output
  • Very short discharge time
  • Increase of solid content up to ca. 100 % with special vacuum process
  • Less cake adhesion on the filter cloth
  • Lower costs for pumps
  • Savings in energy and deposit costs
  • Less

transport costs due to compact and very dry filter cakes Prolong the span-life of filter plate and filter clothes

NMP membrane technology creates homogeneous cake without cracks by applying a low membrane squeeze pressure during cake washing

Benefits and fields of use
  • Uniformcapillary structure
  • Optimal cake washing and blowing efficiency in short time.
  • reduced washing water consumption.
  • Perfect sealing by plan-parallel machining of membrane chamber plates according to DIN 7129
  • Complete Gasketed version (CGR) available

Diameter and quantity of filtrate outlet ports can be adapted to process requirements

  • Big filtrate volumes can easily be drained off
  • No blocking due to solids and/or crystallization
  • No clogging by filter cloth.

The materials used by NMP allow installations in almost every field of application and can be adapted to any working conditions.

  • Temperatures 20 up to 65° C
  • Filtration pressure up to 8 kg.
  • Squeezing pressure up to 16 kg.
  • Variety of chemicals
  • Squeezing medium pressure can only be maintained under full closing pressure of the filter press.
  • The membrane is immediately released from groove, if the closing pressure is lower than the squeezing pressure.
  • Any empty squeezing is prohibited.i.e.chamberwithout slurry or less slurry filling membrane inflation/squeeze is NOT allowed
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Membrane Filter Plates In Details

  • Centre feed port
  • Stay boss
  • Sealing edge
  • Filtering surface
  • Squeezing Port
  • Spigot
  • Handles
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Squeezing System

A Squeeze Pump is used to pressurize the water in membrane plates in order to carry out the squeezing process. Depending on the cases, this pump can be a Impeller type and Volumetric type. At the end of each squeezing process, the volume of water behind the plates is sucked and goes back to in a stocking tank. The squeezing process water is used in a closed circuit.

Safety reminder: the deflation valve must be normal open type which is only closed during squeeze process and always opened in any other process

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Operation Principle Of Membrane Plate

Operation:

1.  Feeding Of Filter Press

During the feeding operation the membranegoes inbackward direction under low tension.Feeding operation is completed when the required feed pressure is obtained.

2.  Sqeezing Of Filter Cake

During squeezing process the membrane goes forward in direction with help of the squeezing medium like air/water. Squeezing process in the membrane filter press reduces the moisture content in the filter cake significantly. The squeezing pressure is normally

higher than the feed pressure.After squeezing the cake thickness should be smaller than thechamber depth. Otherwise overfilling of the chambers could be existent.

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PRECAUTION

NMP Service:

Our service team will support you at installation of the NMP Membrane Chamber Plates:

  • Development for special application
  • Calculation
  • Efficiency test on NMP or Customer Site
  • Process optimization
  • Commissioning
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