What is a Demister?
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DEMISTERs are essential in many process operations for the removal of entrained material in vapour flow. DemisterASIA&#;s Demisters and mist eliminators provide a wide range of solutions suitable for any application.
The principle of a Demister operation is based on having a large number of obstacles intercepting entrained droplets in a vapour flow. These obstacles must provide minimum drop in pressure over the removal system.
How a Demister Works:
Mist eliminators/ Demisters are fabricated from knitted materials with interlocking asymmetrical loops of metal or plastic with typical diameters of 0.1 &#; 0.3mm. By careful choice of wire diameter, DemisterASIA has produced demisters with extremely high free volumes (typically 98 &#; 99%) along with very high removal efficiency and low pressure drop.
Along with wire diameter and mesh density, another important parameter in design and operation of a demisters is the vapour velocity. This can be controlled by careful selection of the eliminator area. Optimal area will depend on operating temperature, pressure and pressure drop. Under normal operating conditions more than 99% removal efficiency can be achieved with a pressure drop of less than 250 Pascals.
Different Types Of Demisters:
DEMISTERs can come in different forms and designs, a general guideline as follows:
Standard DEMISTER TypesSurface Area m²/m³Free Volume %Density kg/m³Typical ApplicationsType Very high efficiencyType .High efficiencyType .Very high efficiency & clean serviceType .Heavy dutyType .Heavy dutyType General purposeType .High velocityType .High velocity, dirty serviceType .High velocity, clean serviceType Dirty service, least pressure dropType High efficiency, fine entrainmentType .Fine entrainmentType High efficiency, fine entrainmentStock Materials commonly used:
Stainless Steel: Grades 302, 304, 316, 316L, 321, 309, 310S
Super Alloys: Inconel 601, Incoloy DS, Hastaloy, Carpenter 20
Fibrous Filament: &#;E&#; Glass, &#;S&#; Glass, &#;A&#; Glass, Basalt, Ceramic, Silica, Kevlar
Others: Aluminium, Monel, Copper, and Brass, Mild Steel (plain and galvanised), Polypropylene, Polyethylene
Want more information on Stainless Steel Demister Pad? Feel free to contact us.
Why Demisters from DemisterASIA?
Elimination of DA demisters are dependent on droplet sizes:
5 &#; 9 micron 99%
>10 micron 99.5%
Most of the weight of entrained mist tends to be associated with the larger mist particles (larger than 5 &#; 10μm) thus providing greater than 99.99% weight removal.
All Demisters from Demister Asia are custom-made to your specification. The units can be broken up into smaller parts for easy installation in tight spaces. Individual drawings are also provided and documented for each of the Demister units upon confirmation.
Our units are known among our customers for good durability. We also have a good track record of negligible annual production errors for the past few years*.
While there are many manufacturers of wire mesh products in Asia, the manufacturing of a Demister requires complex calculations for even the simplest application. Demister Asia is one of the few providers in the Asian and Middle East market whom provides proper performance data for all the units we manufacture.
At Demister Asia, we are experienced in projects from desalination plants to FPSOs. You can be sure to get the best quality and durability for your units with us.
Most importantly, with our Demisters manufactured in reliable factories around the world, we are also one of the most cost effective compared to many &#;Asia-based&#; factories. We can thus provide reliable solutions to our loyal customers at satisfactory prices every year.
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