Steam Boiler Take Wire Mesh Demister Mist Eliminator 150mm 200mm

Steam Boiler Take Wire Mesh Demister

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.

Metal Wire Mesh Pad Demister Type and Applications

Working Theory of Wire Mesh Demister

The mesh pad mist eliminator 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.

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