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Framed wire mesh demister for oil mist eliminating in ventilation system
Framed wire mesh demister for oil mist eliminating in ventilation system
Wire Mesh Demister Design :
2.1General
A.Size, style, thickness, configuration, and materials are specified in XXX Project Specification – Vessels.
B.Mist Eliminator styles are defined as follows:
C.Style G is a mesh blanket having a variable knitted density. The vapor inlet section is the least dense and the outlet section the densest. Typical inlet/outlet knitted mesh densities are 5 lb/ft3 (80.1) and 9 lb/ft3 (144.2). The customer can require variable density blankets having slightly different knitted densities and wire diameters.
Style V is to be determined by the vendor, based on the process conditions provided by customer. Vendor may determine the mist eliminator type best suited to meet the mist elimination requirement. The selected style may include a mesh pad, vane or a combination of mesh & vanes. The mist eliminator may be oriented vertically, horizontally or at an angle determined by the vendor. A single pad of variable knitted density may also be applied.
2.2Construction
A.Mist Eliminators 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.
Mesh Density | Eq to: YORK | Description |
| 80 | 931 | For a given load of mist, the highest flow velocity is achieved of all styles. Ideal where it is required to minimize the pressure loss, possible clogging is concerned, the size of particle to be collected is relatively large, and/or a very high efficiency is not required. |
| 144 | 431 | Used for general purposes. An efficiency of 98 to 99% is achieved at a velocity of 1 to 5 m/sec. |
| 192 | 421 | Used where an especially high efficiency is required. While a pressure loss is slightly higher, it achieves an efficiency of 99 to 100% with particle sizes 3μ or more at a velocity of 1 to 6 m/sec., and is ideal where an efficiency of 90% or more is required at a velocity of 1 m/sec. or less. |
| 216 | Used for collecting fine particles of 1 to 3μ in size. Especially for a low-density mist of 1.0 g or less, it is used in a thickness of 200 to 300 mm. | |
| 432 | 333 | Used for collecting fine particles. An efficiency higher than that of 216 can be achieved. The most remarkable characteristic is that it provides a high efficiency with a reduced thickness. |
How does a demister pad work?
(1)A vapor stream carrying entrained liquid droplets passes through a demister pad. The vapor moves freely through the knitted mesh.
(2)The inertia of the droplets causes them to contact the wire surfaces and coalesce.
(3)The large, coalesced droplets formed in the mesh ultimately drain and drop to the vessel bottom.
Wire Mesh Demister Delivery:
