HL-144 Wire Mesh Demister Wave Pattern Liquid Flow Guiding Effect
There are many types of mesh pad demisters, including flat type,
oblique type, etc.. Usually the mesh pad thickness for flat type
demister is 100mm or 150mm. With simple structure, it suits for low
velocity, low mist rate gas flow. Re-entrainment easily happen when
the gas velocity is too high. While the oblique type (sometimes
also shown as wave shape demister) has flow guiding effect on the
captured liquid droplet, leaving less liquid droplets on the
downside of the mesh pad. So the oblique type demister has less
resistance to the passing gas flow, and is a little harder to cause
re-entrainment. It allows somehow higher velocity and mist content.
The mesh pad demister is mainly constructed by wire mesh pad and
grids. The pad consists multiple layers of fabric-knitted from
metals and synthetic fiber monofilament chosen to suit the
particular duty requirements. After knitting each layer is crimped
and then converted into desired size or shape or pads. The pads are
not entirely rigid and generally supported by open grid structure.
The grids usually adopt stainless steel 25mm*3mm flat bars and Φ6mm
round rods. Sometimes 25*10mm PP grids and special PTFE grids are
also used.
Advantages of mesh pad demister:
Prevention of air pollution
Reduce of costly liquid lose
Reduce of product contamination
Improvement in process efficiency
Minimizing product losses in re-boilers & evaporators
Preventing carbon & metal entrainment in down stream catalyst
cracker.
When Mesh Pad Demister should be replaced?
Due to the fact that the mesh pad demister is normally installed in
a major process line, it is almost impossible to replace them while
the lines are in operation. Therefore, for economy purpose, it is
important to have them replaced during annual or periodic shut-down
period. For these reasons, the followings are presented for the
user’s consideration.
When the thickness has changed.
When the tightness of each pad sections has changed.
When the corrosion of the wire is severely noticed.
When the entrained mist or dust gives pressure drop hazard.
Others as having been experienced by maintenance engineers.
Material of construction and its application:
| Materials | Main Application Area |
| SS304 | Water solutions, Nitric acid reduced crude petroleum fraction etc. |
| SS316L | Fatty acid reduced crude containing naphthenic acids and corrosive
chemicals |
| Synthetic fiber | For corrosive service at moderate temperature |
| PP(Polypropylene) | For corrosive service at temperature up to 70℃ |
| PTFE | For corrosive service at temperature of (-190℃, 250℃) |
| Monel | Caustic soda, dilute acid |
| Nickel | Caustic Soda, food products |
| Copper | Freon, alcohol |
| Aluminium | Nitric Acid |
demister package & shipping:
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