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Fluid bed


Fluid bed

Application area:

The MAHR fluid bed is the discharge aid for poorly flowing but fluidisable dust and powder bulk materials. As a special design, this bed is also used for homogenisation.


Dished bottom: material St. 37 or 1.4301, 1.4541, or disk bottom: 1.4571
Decompaction cloth: plastic fabric (Aeropertex), sintered plastic or sintered metal (sintered bronze or VA)
Seal: rubber or Teflon (for high operating temperatures)


A dished bottom or disk bottom is used as supporting part for the fluid bed. The bed is connected to the silo using a connection flange. The fluid be is covered over the entire surface with air-permeable Aeropertex fabric, through which the provided air or other gaseous medium (nitrogen, argon, etc.) is fed to the material to be ventilated via a connection nozzle in the ventilation bed. The fabric is also not permeable for finest-grained products. Aeropertex fabric is 100% polyester, does not absorb any moisture and is resistant to weak acids and alkalis. It is resistant to rotting and weathering, wear-resistant and compatible with continuous temperatures up to 160°C and 180 °C for short times. The fabric is self-cleaning due to the air flow. Depending on the size of the bed, the ventilated area is divided into one or more segments. Division and ventilation of the area in segments is particularly very important for homogenisation.


Using an air source (factory network or compressor), dry and oil-free air or gas is fed to the air chamber of the bed via the ventilation nozzles. This air flows through the porous surface of the decompaction covering into the silage medium in the silo or pressure conveyor, fluidises this and makes it flowable. The material does not have the possibility to penetrate through the decompaction covering. The decompacted material flows through the discharge nozzle into the downstream units.