Ceramic-lined valves Ceramic-lined pipelines

Hydrocyclones

Cera System Verschleißschutz GmbH has been successfully developing, manufacturing and distributing various designs of ceramic-lined valves and pipelines for the transport of highly abrasive media for many years.

Several customers also have separation elements in their systems that are exposed to the same conditions and exposed to high wear. As a result, the development of hydrocyclones can be considered to be a logical consequence.

Hydrocyclones are sedimentation devices that utilise centrifugal forces in rotating flows. They are ideal for the separation of solids and liquids that can be found in fluids, which do not mix or dissolve in the carrier media.

Thanks to the tangential introduction of the suspension into the cyclone - head via the inlet nozzle, a rotating flow occurs, whereby a centrifugal acceleration (centrifugal force) is generated that can be greater than the gravityl acceleration.

As a result, abrasion and wear inevitably occur on the wall of the cyclone.

Therefore, the utilisation of ceramic-lined materials is highly effective.

The hydrocyclones are manufactured using mineral casting, aluminium oxide or silicon carbide depending upon the hardness of the particles that are to be separated. Cyclones can also be manufactured using silicon nitride for very high-temperature applications.

The ceramic-lined components are installed in a metal housing or coated into GRP (glass-fibre reinforced plastic) in order to protect against mechanical stress, to absorb pipeline and pressure forces and also to provide heat insulation.

Cyclones are advantageously used to separate particles measuring between 0.5 mm and 5 µm. When operated at a sufficiently high rotational speed, separation in cyclones is achieved between 100 to 1000 times faster as compared to gravimetric sedimentation.

Generally, coarser particles (over 0.5 mm) can be separated more easily in stationary sedimentation tanks.

It is possible to separate particles smaller than 5 µm with special hydrocyclones that have a very small diameter.

In order to increase the throughput capacity, multiple cyclones are connected to one another in a ring - line or in a multi-cyclone plant.

By connecting cyclones in series, it is possible to achieve a higher degree of refinement as well as the separation of finer particles.

Author: Heinz Albert

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