Ship Wire Mesh Demister

Wire mesh demister in vessel boiler system custom shape and size


Wire Mesh Demister Mist Eliminators Standard Specification

1.General introduction of wire mesh demister

Wire mesh demister is used to separate mixture of vapor liquid in some industrial applications. Sometimes a vapor-liquid separator may also referred to as a flash drum, knock-out drum, compressor suction drum or compressor inlet drum. It is usually called mist eliminator when used to remove suspended water droplet from air stream.

Normally, in the vertical vessels, the liquid drops to the bottom, where they are withdrawn, as the force of gravity. But in low gravity environments like a space station, the gravity is not usable effectively. At this time, centrifugal force needs to be utilised in a spinning centrifugal separator to drive liquid droplets to the outer edge of the device while gas migrates to the centre.
In either way of separation, the gas outlet can be surrounded by a spinning mesh screen or grating. If any droplets occasionally reach the outlet, they will strike the grating, be accelerated and thrown away from the outlet.
The vapor goes through the mist eliminator at a designed velocity which minimizes the re-entrainment of any liquid droplets.
The feed to a vapor-liquid separator may also be a kind of liquid which is being partially or totally flashed into a vapor when it enters the device.

Only when there is air space inside the chamber, the vapor-liquid separator is effective. It can fail either when the mixed stream inlet is overwhelmed or the draining of collected liquid is slower than its growing. Considering this, the separator may be combined with some liquid level sensing accessories, such as a sight glass or float sensor. By doing this, both the supply and drain flow can be regulated to prevent the separator from being overloaded.

2. Construction of wire mesh demister

A.The wire mesh demister shall be fabricated in one piece or in the minimum number of sections required for insertion through the vessel manway.
B.Mesh pads shall fit tightly into the pad containment system.
C.Mesh pad layers shall not be more than 9 inches (230 mm) thick. Where more than one layer is required, joints shall be staggered.
D.One-piece circular mesh pads may be spiral in form.
2.3Supports and Grids
A.The general arrangement of Mist Eliminator supports and grids shall be as factory habit unless required by customer.
B.Final details of Mist Eliminator supports and hold down grids can also be furnished by the Mist Eliminator supplier.
C.The Mist Eliminator supplier shall furnish details of components attached to the vessel to the vessel fabricator in time to permit installation without altering the vessel fabrication schedule.
D.Each section of the mesh pad shall include a grid on each side.
E.Style G mesh pads shall be furnished with an inlet and an outlet rigid welded grid. The outlet grid and blanket outlet zone of the Style G mesh pad shall be distinctly marked “Outlet”.
F.Spiral mesh pads shall include X-type grids on both sides.
2.4Fastening Devices
As the Mist Eliminator fabricator we can supply wire ties or other devices to fasten the Mist Eliminator sections to the supports, attach the grids to their vessel supports, and where multiple layer Mist Eliminators are necessary, to secure the layers together.

3.Materials of wire mesh demister

Mesh and grids may be made from most metals and plastics i.e. SS304, 304L, 316, 316L, 321, 310S, 201, Duplex 2205, 316Ti, 904L, Monel, Nickel, Alloy 20, Copper, P.T.F.E., H.D.P.E., P.P., co-knit of 316L + PTFE, alloy 20 + PTFE, 304+PTFE, 904L + PTFE, 304+glass fiber, 316L + glass fiber, 904L + glass fiber, 316L+PP etc. and other metals, alloys or plastic which can be drawn or extruded.

4. What can factory do for you in the wire mesh demister?

1. demister is tailor made to suit for specific vessel dimensions and configuration.
2. provides wide variety of material to suit for even the most corrosive process environments.
3. factory can supplies either mesh pad only, or complete demister with top and bottom supporting grids for direct installation in vessels.
4. Sectional construction for easy handling and access through man ways.
5. Complete accessory pack including support ring and beam can be provided when required.

5. Wire Mesh Demister Inquiry Table if Calculation Suggestions and Service are needed

Please pay attention to the Unit when refering to this sheet.

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