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What is a Demister?
DEMISTERs are essential in many process operations for the removal of entrained material in vapour flow. Demister ASIA’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.
It can be made of various materials, depending on its use, and its major materials are as per the below:
1. SUS304, 304L, SUS316, 316L, MONEL
2. P.P (POLY PROPYLENE), P.E (POLY ETHYLENE), TEFLON
Demister Separator Advantages:
Absolute separation of liquid particles greater than 10; for the operation under extreme temperature and pressure; minimal pressure loss
For the filtration of natural gas
Demister of wire mesh pad is also known as mist eliminators or sprays. This is a kind of high efficiency separation devices, used throughout all kinds of process industries, to remove liquid droplets from gas or vapor streams.
Wire mesh demister pads are used in chemical, petroleum, sulfate, medicine, light industry, metallurgy, machine, building, construction, aviation, shipping and environment protection. Demister pad is mainly used to eliminate streams with diameter of more than 3μm to 5μm.
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.
Specification List of Filter Mesh
stainless steel wire
1, For 40-100 model: 40 holes in 100% width
2, Metal filter mesh can be processed into weaves type
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
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.
Mesh demister (or named mesh mist eliminator) is used to gas entrainment fog (droplet) remove, recycle expensive droplet (precious materials), or purification of gas to reduce gas impurities. Mesh mist eliminator is 0.15mm~0.25mm corrosion-resitant metal wire or PP, PTFE and other engineering plastics using a special wire woven wire mesh jingwei way, and then pressed into a mesh-type wave (Wtype) formed after the cross-stack shop.
of wire-mesh demister
In the general operation of chemical industry, the dispersed drops in the gas, as usual, is with the diameter about 0.1～5000μm. For the drop diameter above 100μm, it can be solved easily because of its high sedimentation. For the drops diameter above 50μm, it can be separated by gravitational settling method, and, for the diameter above 5μm can by inertial impaction & centrifuge method. But, for the drops diameter is less than the 5μm, it will be congregated lager diameter, or be separated by using fiber filter or static demister.
Contact us for more information:
Tel: +86 188 3181 6606