Scrubber Wire Mesh Demister
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.
Wire Mesh Demister Materials :
3.1Metallic Mesh Pads
Materials for metallic Mist Eliminators are as per customer need. Type 304 or Type 316 mesh pads can be in accordance with ASTM A-478. Monel mesh pads can be in accordance with ASTM B-164.
3.2Non-metallic Mist Eliminators
Non-metallic Mist Eliminators shall be PTFE or polypropylene as specified in by customer.
3.3Supports
A.Supports welded to the vessel shall be the same material as the shell. Where the shell is lined, supports welded to the lining shall be the same material as the lining.
B.Supports not welded to the shell (e.g. beams) shall be the same material as the Mist Eliminator.
3.4Grids
A.Metallic grids can be the same material as the mesh pad
B.For non-metallic mesh pads, the grids shall be carbon steel, coated with the same material as the mesh pad.
3.5Fastening Devices
A.For metallic mesh pads the wire ties or other fastening devices shall be of the same material as the Mist Eliminator.For non-metallic mesh pads, the grids shall be carbon steel, coated with the same material as the mesh pad.
B.For non-metallic mesh pads the wire ties can be the same material as the mesh pad.
Metal Wire Mesh Pad Demister Type and Applications
|
Wire Dia.
mm
|
Mesh Density
Kg/m3
|
Surface Area
M2/m3
|
Normal Micron Rating |
Application |
| 0.15 |
195 |
650 |
3 |
Very high efficiency in clean service |
| 0.15 |
145 |
480 |
4 |
Fine droplet removal in clean service |
| 0.15 |
112 |
375 |
5 |
General purpose in clean service |
| 0.28 |
195 |
355 |
5 |
Optimum efficiency & pressure drop |
| 0.28 |
170 |
310 |
6 |
General purpose not totally clean |
| 0.28 |
145 |
265 |
8 |
Heavy Duty e.g. Oil & Gas Separators |
| 0.28 |
110 |
200 |
10 |
Light fouling |
| 0.28 |
80 |
145 |
12 |
Moderate fouling |
Working Theory of Wire Mesh Demister
A mist eliminator is a device usually used in vapor-liquid separator columns, which removes the liquid droplets entrained in a vapor stream. The mist eliminator may be mesh type, vane pack type or other structure intended to aggregate the tiny mist into droplets. So the droplets are heavy enough to be separated from the vapor stream.
The mist eliminator can reduce the residence time required to separate a given droplet size by reducing the volume and cost of separation equipment. The mist eliminators are often used where vapor quality is important in regard to entrained liquids, particularly where separator equipment costs are high (for example, high pressure systems), or where space or weight saved are valuable.
When the marine vessels process the brine by desalination, the brine is flash heated into vapor. In flashing, the vapor carries droplets of brine, that had better to be separated before condensing. Otherwise it will contaminate the vapor with salt. That is what the mist eliminator does. The pure vapor condenses on tubes in the desalination plant, and water is collected from the system.
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