The principle
of wire-mesh demister
The
diameter of the separated drops in the gas
which comes out in the ordinary chemical industry
operation is about 0.1～5000μm. The separation
of drops which have the diameter of above
100μm can be solved easily, for the sedimentation
speed of such drops is relatively high. The
drops which have the diameter above 50μm can
be separated by gravitational settling method,
the ones which have the diameter above 5μm
can be separated by inertial impaction and
centrifuge method; the smaller ones should
be congregated to become lager, or be separated
by using fiber filter and static demister.
wire-mesh
demister（or mist eliminator）is mainly used
to separate drops of the  diameter
between 3μm to 5μm, the operating principle
is showed in the fig at the right side. When
the gas with liquid drops rises at a certain
speed, passing through the wire mesh on the
grid bar, the inertia of the rising drops
make them collide with the wire and then adhere
to the surface of the wire. The drops on the
wire will diffuse and subside. It makes the
drops form bigger ones and then flow along
the wire to the intertexture of the wire.
Because the wire can be humidified, and because
of the surface tension of liquid and the capillarity
effect of the wire, the drops will become
bigger and bigger. They will be separated
and fall when their own weight exceed the
resultant force of buoyancy of the rising
gas and surface tension of liquid. They will
flow to the device of the container in the
backward position. As long as the speed of
the gas is properly controlled and with other
proper condition, the efficiency of foam remove
will be as high as 97% after the gas pass
through wire-mesh demister. The purpose of
removing foam will be achieved completely.
The
characteristic of wire-mesh demister
● Structure simple, weight
light.
● High factor of porosity,
low head loss.
● Great contact surface
area, high removing foam ratio.
● Convenience of installing,
operating and repairing.
● Long service life.
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