INCREASES LIQUID CAPACITY
BY 300%
AND VAPOUR CAPACITY BY 20%
VKR Enhanced™ Mist Eliminators++ provide high performance wherever
liquid entrainment must be removed from a vertically flowing gas stream.
This simple enhancement to a standard mesh pad inherently improves mist
elimination since the higher velocities that are used increase the droplets’ inertial
impaction with the wires or filaments. Meanwhile, collecting droplets
in strategically placed channels protect against the secondary droplet
formation typical in the drainage zone of a standard pad.
Demisting pads with VKR Enhanced™ technology employ the mechanism
of a Von Karman Roll (VKR) around a bluff body (See Figure 1a) to obtain
high vapour and liquid handling capacity. Here a vortex develops in
a low pressure zone downstream of the channel that has been attached
to the bottom of the mesh pad. Collected droplets deposit in the trough
and form a flowing liquid stream there. Contrast this with the standard
mesh pad (See Figure 1b) where a two phase ‘fluidized’ zone
of gas and liquid develops in the bottom third to half of the pad and
from which large coalesced droplets must ultimately drain counter-current
to the ascending stream. The high capacity channels of the VKR Enhanced™ Mist
Eliminators shield the collected liquid and then drain it in steady
streams, from two sides of the mist eliminator, at the tower periphery
where gas velocity is so low that re-entrainment almost never occurs
(See Figure 2).
++ VKR Enhanced™ Mist Eliminators are produced
under license from BECO Engineering under
US Patent Number 5,439,510.
Figure 1a: Von Karman Roll Vortex depositing
droplets into channel.
Figure 1b: Drainage from a traditional pad promotes the secondary formation of fine droplets.
Figure 2: High capacity channels drain collected liquid near tower
wall and away from support ring.
You
can download more detailed information from our Data Centre in PDF format.
