Removal by Inertial Impaction Uses the energy from the fluid Removal of larger particle size, 10 micron and above Used for bulk removal. Removal by Direct Impaction Uses Filter Media with close mesh size (and inertial device) Removal of fine particle size, typically 1 micron and above
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Uses the energy from the fluid
Removal of larger particle size, 10 micron and above
Used for bulk removal
Removal by Direct Impaction
Uses Filter Media with close mesh size (and inertial device)
Removal of fine particle size, typically 1 micron and above
Used for both bulk & aerosol removalSeparation Vs Filtration
Properties of Gas, flow rate
Type and quantity of Particle to be removed and its properties
Operating pressure & temperature
Type of controls required
Pressure drop allowed & Turn-down Ratio
Material specificationFactors Influencing Gas Filtration Selection
Type & Property of Contaminant – Oil in particular
Gas Property or MW or Sp. Gravity
Flow Rate – Min / Max
Operating Pressure – Min / Max
Operating Temperature – Min / Max
Allowed pressure drop
Liquid Holding time or capacity
Configuration – Horizontal, Vertical, In-line
Special material, if any, requiredInformation Required
High pressure increases cost of separator.
High pressure increases density resulting in decrease in density difference between gas & liquid and separation becomes more difficult.
Drop in allowable shear force and therefore reduced velocity. (rV2)
Mass flow rate is independent of pressure for a given SCFM.Operating Pressure
Nature of liquid and volume flow rate, Liquid/Gas ratio,
Density of liquid.
Viscosity of the liquid, if high drainage would be a problem, may require a mesh pad foe vane packs.
Surface tension, if shear stress drops, re-entrainment would occur.
Above factors dictate size, type of device and controls required.Type of Contaminant
Vane will not guarantee removal of solids.
If heavy oil is present may require mesh pad addition.
Re-entrainment occurs at high gas velocity, dictates size of filter vessel.
Influences filter element selection .
Influences configuration.Removal Efficiency
Use client specified value or use TEMA or Chemical Engineers Handbook.
Use 1 if details not known.Compressibility Factor
Inlet to have a baffle to break the momentum and to protect against slugs.
If oil or other liquid contaminants expected, vane pack with/without mesh pad or multi-cyclone type device required.
If vane is selected for first stage and if inlet is directly in front, to use agglomerator .
Holding capacity required.
Size of inlet/outlet to vessel size.Design Considerations