Description
DEMISTER Features (Mesh Pad type)
Specification
TCI mesh mist eliminators are manufactured in a wide variety
of metals and
synthetics of which the following are supplied as standard:-
Stainless steels (types **4, **4L, **6, **6L, **1, **0)
Monel
Nickel & nickel alloys
Copper & copper alloys
Glass wool or fibre
Polypropylene
Halar / PTFE
The wire mesh may be knitted and formed to provide a wide range of
specific
properties to suit various applications. The following is a list of
standard mesh styles
that we supply:-
STYLE APPLICATIONS
HE High efficiency removal of fine mists
GP General purpose (maximum efficiency with low pressure loss)
DS Dirty service where fouling is an issue
Mist Eliminator Design
Mesh pads should be sized so that the face area provides a vapour
rate of
approximately *0% of the maximum allowable re-entrainment velocity.
For
estimation purposes, suitable design velocities occur at a K-factor
of 0.*1 m/s for
vertical flow, or 0.*5 for horizontal gas flow (due to better
drainage) where:-
vs = K . {( ï²L - ï²V )/ ï²V} 0.5
where vs = Actual vapour velocity (m/s)
ï²V
= Vapour density (kg/m3)
ï²L
= Liquid density (kg/m3)
Operating pressure loss across the pad within the above design
range is normally
less than 0.5 kPa depending upon mesh density, pad thickness,
liquid loading and
vapour rate. An approximate pressure drop can be estimated from the
formula:
Wet ï„P (kPa) = C . (ï²L – ï²V) . K2 . t
Where C = 0.*0 for a typical ‘GP’ style mesh demister, and t is the
pad thickness in
metres. Note that the dry pressure drop is about half of the wet
figure.
