Operation Principle
Demister pad is a device used for removing entrained liquid droplets from a gas stream. As the name indicates the demister is used for removal of the mist from gaseous phase. Demister pad is often fitted just below the top vapor outlet of a vapor liquid separator. The demister pads work by coalescing smaller liquid droplets by obstructing their path. Obstruction of path causes increased collisions among the liquid droplets. Most of these droplets stick together and form bigger droplets which are too heavy to rise with the gas stream. Thus the bigger liquid drops drop down in the pool of liquid below.
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Gas stream is not affected by the obstruction in the path and escapes through top vapor outlet. The obstruction in the path of liquid droplets can be achieved by a variety of geometries. Demister pad may be a mesh type Coalescers to aggregate the mist into droplets that are heavy enough to separate from the vapor stream.
Tower Equipment Types
Demister Pads Function & Specifications
In the separation process, the droplets flow through the mesh pads and collide with the surface of the wire due to their inertia. The collected droplets coalescence at the cross points in the mesh pad and fall back as larger droplets into the vessel. The separation efficiency improves with increasing flow velocity. The maximum flow velocity must not be exceeded, however since flooding will cause re-entrainment to occur.
The maximum droplet diameter for 99.9% fraction separation efficiency is within a range of 3 μm to 15 μm for standard mesh types. The wire mesh droplet demisters are made of fine wires with different mesh widths whereby the wire diameter generally ranges between 0.15 mm and 0.274 mm. The specific surfaces, depending on the type, are between around 90 m2/m3 to around 1120 m2/m3. Specially designed supports and cover grids are generally supplied to support the mesh pads, which are arranged so that the free inflow area is approximately 90%.
When installing the wire mesh, the mesh pad must fit tightly to the wall of the column to prevent any gas leaking through. The pad of the wire mesh droplet separators (demisters) is between 100 and 150 mm thick in most applications. If the gas- or steam flow contains very fine droplets, e.g. as created during condensation, considerably deeper pads or multiple layers are required.
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Mistex Pad
Mist Eliminator
Mist Extractor
Demister
Demister Pad
Mesh Pad
Something else?
No matter what you call it, all of these names are synonymous terms for the same thing— Knitted Wire Mesh that eliminates liquid entrainment from gas streams. CWI Tech-Mesh™ is knitted on state-of-the-art equipment under strict quality control processes to provide a winding path and a large surface area for the droplets entrained in the gas stream, maximizing gas/liquid separation efficiency and minimizing pressure drop. This low-cost method helps prevent damage and product loss within the facility, cutting operation expenses down more than you may forecast. CWI Tech-Mesh™ Demister Pads are used in many industries including food, agriculture, building and construction, aerospace, mining, and especially the oil and gas industry for their refinery tower internals. Central Wire manufactures Mist Eliminator coalesces in a wide range of wire diameters, alloys, mesh densities, and product geometries under precise production and processing equipment capabilities. We produce the core products for our demister pads in-house that comprise the final product including wire, support rods, and welding wire. If you are looking for high-quality, highly customizable demister pads, get a quote from Central Wire Industries to ensure your order is completed to your standards. Read on to learn more about the benefits, functions, and applications.
What's so good about this low-cost method?
Tech-Mesh can be easily tailor-made to suit most vessel dimensions. CWI has them a
vailable in a wide range of alloys, densities, and geometries, making custom demister pad sizing a smooth process. It's also a
flexible solution for most mist elimination applications since the lightweight sections are very easy to install, have no moving parts, and are easy to maintain
. With the corrosion resistance and high durability of demister pads, they have a long service life and can be one of the most cost-effective liquid separator solutions for your operation.
How do they work?
As its many names imply, mist eliminators remove moisture from gas streams. They are typically fitted just below tank outlets and can be installed either vertically or horizontally, depending on the configuration of the unit. Vapor carries mist as it rises, and while gas is free to pass through knitted mesh unobstructed, individual mist droplets become trapped. The droplets then grow in size as moisture accumulates, eventually causing the heaviest ones to fall back into the pool of liquid below. This coalescing process prevents even small drops of liquid from rising to the top of the tank.
Main Applications:
Demister Process Applications
For more information, please visit Stainless Steel Demister Pad.
Gas-Liquid Separators
Distillation Equipment
Scrubbers, Process Absorbers, and Precipitators
Chemical Separators and Extractors
Oil and Gas Processing Equipment
Combustion Gas Scrubbers
Knockout Drums and Receivers
Refinery Towers
Liquid-Liquid Coalecers
Pollution Control Equipment
Two-Phase Eliminators
Liquid Entrainment for Compressor Equipment
Product Recovery Systems
If you need stainless steel, copper, or specialty alloy, we have it in stock. We are established as a high-end, custom demister pad supplier in the United States, United Kingdom, and Canada. Come visit Central Wire Industries’ website devoted to bulk mesh and finished mist eliminators for oil and gas industries. Whether you are performing routine maintenance for turnaround season, installing a new tower, or upgrading your tower internals, rely on the trusted quality of CWI Tech-Mesh™ to get the job done right. Visit our site for information about our alloys, applications, technical resources, and product configurations.
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