| Customization: | Available |
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| Manufacturing Process: | Mesh Knitting and Grids Welding |
| Surface Treatment: | Grids with Pickling Treatment |
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Wire mesh demister pad made for low pressure rectifying column
Low pressure rectifying column:
The wire mesh demister pad increases the purification ratio, that enables a deep cut in residue oil to improve the quality of gas oil. The improved gas oil contains less carbon, asphalt and corrosive metals, increases decomposition capacity by the residue load in the regenerator, and maintains a higher contact reaction to produce a higher gasoline yield ratio.
Wire Mesh Demister Standard Specification (part):
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.
Wire Mesh Demister Styles:
| Style | Material |
Density lb/ft3 (kg/m3) |
Wire Diameter Inches (mm) |
| A | Metallic | 9 (144.2) | 0.011 (0.28) |
| B | Metallic | 5 (80.1) | 0.011 (0.28) |
| C | Metallic | 12 (192.2) | 0.011 (0.28) |
| D |
Polytetrafluroethylene (PTFE) |
normal | 0.012 (0.30) |
| F | Polypropylene | normal | 0.012 (0.30) |
| G | Metallic |
Variable 5 (80.1) - 9 (144.2) |
0.011 (0.28) |
| V | Metallic | Other | normal |
Where are DEMISTER units used?
Knockout drums and separators - save on capital costs by decreasing vessel size-recover costly fatty acids from stream-reduce compressor maintenance by preventing scale build-up.
Absorbers - reduce overhead losses of glycols in dehydrators to no more than 0.1 gal/MMSCF natural gas-cut losses of absorption oil and amines in CO2 systems.
Scrubbers - reduce chemical discharges from Kraft mill smelt dissolver tank to less than 0.11 kg/dry ton (0.25 lb/dry ton) of pulp-improve scrubber efficiency by removing particulates carried in entrained liquids.
Distillation columns - improve product purities and increase throughput capacities for petrochemicals, organic intermediates, fine chemicals.
Evaporators - prevent carryover loss of valuable products, keep condensate TDS <10 ppm for highest quality boiler feed water-clean up vacuum ejector stream discharge-lower maintenance in vapor re-compression systems.
High pressure steam systems - provide dry steam- cut TDS to <10 ppb in condensate-eliminate build-up on turbine blades.
Refinery towers - increase throughput capacity-take deeper cuts for greater product yields - prolong catalyst life in downstream cracking and reforming units by reducing carbon and metals in side
draws-use lower grade crudes.
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