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 304, 304L, 316, 316L, 321, 430)
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 80% of the maximum allowable re-entrainment velocity. For
estimation purposes, suitable design velocities occur at a K-factor of 0.11 m/s for
vertical flow, or 0.15 for horizontal gas flow (due to better drainage) where:-
vs = K . {( L - V )/ V} 0.5
where vs = Actual vapour velocity (m/s)
V
= Vapour density (kg/m3)
L
= 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 P (kPa) = C . (L – V) . K2 . t
Where C = 0.20 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.