Horizontal style gas liquid separators have inlet and outlet nozzles
located on the same plane and are often in-line (180°apart) although
the outlet nozzle can be offset 90°to 270° from the inlet nozzle
if needed. All of our single stage centrifugal separators are
designed to remove droplets and particles greater than 10 microns with
99% efficiency, however their design affects the rate or capacity of
droplets that can be removed. The liquid removal capacity is
expressed as a percentage of the separators maximum flow capacity, thus
we convert the separators volumetric flow to weight flow and then based
upon the percentage for a given separator design can estimate the liquid
The most common and inexpensive horizontal gas
liquid separator consists of a cylindrical pressure vessel having an
inlet and outlet in addition to vent and drain ports. This style
of separator may also be used for vertical down flow orientation.
The air, steam or other gas enters the vessel and encounters a
baffle having slots located at right angles to the process flow.
Due to reduction in velocity and inertia, most droplets impinge on the
baffle and coalesce to larger droplets.
The gas flow though the
baffle creates a vortex induced centrifugal force propelling entrained
droplets larger than 10 microns away from the vessel outlet and towards
its walls. All of the coalesced liquid exits through the drain
port. The liquid removal capacity is equivalent to 5% of the
separators maximum weight-flow capacity and that removal rate can be
increase to as much as 20% with the addition of a cylindrical sump.
High Liquid Load Centrifugal Separators
Processes which have higher volumes of liquid or where "slugs" of liquid
are possible benefit from the "T" design. The principle of
operation is the same as previously described except that the gas flow
must drop below the inlet and outlet nozzle plane and due to inertia,
pressure drop and centrifugal forces droplets are coalesced and drain to
a common port. Agitation and reentrainment of the coalesced fluid
is prevented with a lower baffle.
The length of the vessel under
the nozzles and the complexity of the internal baffle geometry determine
the percentage of the separators weight flow capacity for liquid
removal, ranging from 40 to 90%.
All of the horizontal separator
designs described above have no internal parts or serviceable components
and they are considered self-cleaning due to the continuous vortex
"scrubbing" the internal geometry.Extra-Fine Droplet
The addition of a secondary filter media coalescing
stage enables droplets as fine as 0.3 microns to be removed from the
process flow. This increases the complexity of the vessel design
as it will now require periodic replacement of special borosilicate
microglass filter cartridges.