|TURBULENT CONTACT SCRUBBER PACKING|
Turbulent Contact Absorber treating Hydroflouric Acid and
Fluidised bed technology
FLUIDISED BED Vs FIXED BED TOWERS
Turbulent Contact scrubber towers offer many advantages over static packed towers. Not only are substantial increases in efficiency possible per unit tower height, but much larger gas throughputs can be handled with smaller tower diameters. This leads to substantial savings in both capital and operating costs.
Hollow plastic balls are fluidised by the ascending gas stream as it passes counter-currently against the liquid. The liquid hold-up and turbulence created within the bed dramatically reduces both the gas and liquid side resistance to mass transfer, and perfect conditions for blockage free solids removal are created.
Principles of design
To ensure that the bed fluidises
evenly, a uniform velocity profile across the tower section is essential.
This is normally achieved by baffling the gas at the inlet, however to
ensure that a maximum contact and turbulence is generated, the absorption
zone is divided into several stages. Usually three stages are sufficient,
however when high efficiencies are required or fine solids particulates
are present, a fourth stage may be recommended.
Increases in liquid flow rate, gas velocity and packing bed depth can be easily accommodated in an attempt to reduce outlet emissions further still. The physical dimensions of the scrubber will however remain unchanged and costly replacement towers can be avoided.
|Design and technical development
Over many years, extensive work has been carried out on the use of fluidised bed scrubbing systems and Euro-Matic continues to advance this technology through academic research and on-site evaluation.
In collaboration with specialised
scrubber manufacturers who have considerable experience of installing fluidised
bed systems, Euro-Matic can offer fully operational pilot plants for on-site
test work. For
a given process specification, initial design recommendations are provided
by Euro-Matic. A complete system design, fabrication, installation and
commissioning service is provided by scrubber manufacturers with specialist
knowledge of turbulent contact gas scrubber design.A video is available
which clearly demonstrates the fluidisation and turbulent contact of the
packing with the concurrent liquid and gas flows. A technical specification
and reference list is also available covering recent installations.
Polypropylene and High Density
Polyethylene will suit most process operating requirements. For highly
aggressive chemicals or at temperatures above 110oC, PVDF should be specified.
| Schematic layout of a turbulent
contact gas scrubber
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