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where they are withdrawn, as the force of gravity.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 Hualai factory do for you in the wire
mesh demister?
1. Hualai demister is tailor made to suit for specific vessel
dimensions and configuration.
2. Hualai provides wide variety of material to suit for even the
most corrosive process environments.
3. Hualai 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 State your demister / mist eliminator application |
|
Operating data |
Gas | Max. gas volume flow (operating conditions) | M3/h | |
Gas density (operating condistions) | Kg/m3 | |
Operating pressure | Bar (a) | |
Operating temperature | ℃ | |
Liquid | Liquid content | Kg/h | |
Liquid density | Kg/m3 | |
Dynamic viscosity of the liquid | mPas | |
Geometrical data |
Flow direction | Horizontal | ¨ |
Vertical | ¨ |
Installed in | Column | ¨ |
Pipe | ¨ |
Column diameter or dimensions | mm | |
Opening for installation | Manhole | ¨ DN |
Vessel flange | ¨ Size |
Requirements |
type of mist eliminator | Wire mesh demister | |
Material | | |
Efficiency of separation | % | |
Max. pressure drop | | |
Miscellaneous | | |
Please pay attention to the Unit when refering to this sheet.
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