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Wire mesh demister in vessel boiler system custom shape and size
Wire Mesh Demister Mist Eliminators Standard Specification
1.General introduction of wire mesh demister
Wire mesh demister is used to separate mixture of vapor liquid in some industrial applications. Sometimes a vapor-liquid separator may also referred to as a flash drum, knock-out drum, compressor suction drum or compressor inlet drum. It is usually called mist eliminator when used to remove suspended water droplet from air stream.
Normally, in the vertical vessels, the liquid drops to the bottom, where they are withdrawn, as the force of gravity. But in low gravity environments like a space station, the gravity is not usable effectively. At this time, centrifugal force needs to be utilised in a spinning centrifugal separator to drive liquid droplets to the outer edge of the device while gas migrates to the centre. In either way of separation, the gas outlet can be surrounded by a spinning mesh screen or grating. If any droplets occasionally reach the outlet, they will strike the grating, be accelerated and thrown away from the outlet. The vapor goes through the mist eliminator at a designed velocity which minimizes the re-entrainment of any liquid droplets. The feed to a vapor-liquid separator may also be a kind of liquid which is being partially or totally flashed into a vapor when it enters the device.
Only when there is air space inside the chamber, the vapor-liquid separator is effective. It can fail either when the mixed stream inlet is overwhelmed or the draining of collected liquid is slower than its growing. Considering this, the separator may be combined with some liquid level sensing accessories, such as a sight glass or float sensor. By doing this, both the supply and drain flow can be regulated to prevent the separator from being overloaded.
2. Demister mesh density and its applications
Mesh density
(stainless steel)
Application
50 kg/m3
Heavy fouling, e.g. evaporators
80 kg/m3
Moderate fouling, e.g. vessel boilers
110 kg/m3
Light fouling
145 kg/m3
Heavy duty, e.g. oil and gas separators
170 kg/m3
General purpose, not totally clean
195 kg/m3
Optimum efficiency & pressure drop
240 kg/m3
High density with high separation efficiency
112 kg/m3
General purpose, clean service
145 kg/m3
Find droplet removal in clean service
3.Material of construction and its application:
Materials
Main Application Area
SS304
Water solutions, Nitric acid reduced crude petroleum fraction etc.
SS316L
Fatty acid reduced crude containing naphthenic acids and corrosive chemicals
Synthetic fiber
For corrosive service at moderate temperature
PP(Polypropylene)
For corrosive service at temperature up to 70℃
PTFE
For corrosive service at temperature of (-190℃, 250℃)
Monel
Caustic soda, dilute acid
Nickel
Caustic Soda, food products
Copper
Freon, alcohol
Aluminium
Nitric Acid
4. 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.
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Meanwhile OEM /ODM services are available, Welcome friends from all walks of life come to visi... We do business in this line sinice 2009. We have the lower price , high quality, prompt delivery, beautiful packing , and advance tehonogy, we are able to meet all our customers' need .
Meanwhile OEM /ODM services are available, Welcome friends from all walks of life come to visi...