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Wire mesh demister in scrubber of ocean going vessel NOx control
Wire Mesh Demister Mist Eliminators Standard Specification
1. General introduction of wire mesh demister
The wire mesh demister is designed to collect liquid particles
contained in the vapour phase after boiling, vacuum evaporation or
bubbling process.
Small droplets in the gas contact the wide surface of the filaments
of the mesh pad mist eliminator, gradually grow into large liquid
droplets and flow and drop by a special structure accelerating the
coalescing of the liquid droplets. The mesh pad of the mist
eliminator is highly porous, so the vapour gas passes through the
mist eliminator without hindrance, leaving only pure gas.
The process is not a type of filtering as the hole size of the knit
mesh is not specially related to the size of the liquid droplets.
This mist elimination is caused by the collision and sudden change
resulting from the flowing speed of the small liquid droplets, and
the coalescing of the liquid drips and gravity cause their descent.
This is a process combing mechanical and physical phenomenon.
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. Demister mesh density and its applications
Mesh density (stainless steel) | Application |
50 kg/m3 | Heavy fouling, e.g. evaporators |
80 kg/m3 | Moderate fouling, e.g. vessel boilers |
110 kg/m3 | Light fouling |
145 kg/m3 | Heavy duty, e.g. oil and gas separators |
170 kg/m3 | General purpose, not totally clean |
195 kg/m3 | Optimum efficiency & pressure drop |
240 kg/m3 | High density with high separation efficiency |
112 kg/m3 | General purpose, clean service |
145 kg/m3 | Find droplet removal in clean service |
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.
Wire Mesh Demister shipping: