Demister pad, also called mist pad, wire mesh demister, mesh mist eliminator, catching mist, mist eliminator, is used in gas entrained mist separation column to guarantee the filtering efficiency.
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DPZ-01: Working principle of demister pad.
History of demister pad
The late fifties, the foreign used an apparatus which made of the special wrinkle woven mesh to remove inclusions of tiny liquid foam in the gas. Then it is found that is very efficient and the resistance is very small, which is unmatched by other gas-liquid separation device, so it is widely accepted and used in a wide range of applications.
Wire demister standard was formulated by the Ministry of Chemical Industry in China on December 20, , the basic implementation of the Shanghai municipal government standards Q/YSZZ-88-91 wire mesh industry was in , began to fully implement HG/T- national unity standard after the year . The new standard demisters are divided into HG5--81 riser type, HG5--81 necking type and HG5--81 full bore wire mesh device.
Demister pad is commonly placed at the top of the packing tower, which can not only ensure the mass transfer efficiency, but also reduce the board spacing. Demister pad is widely used in chemical, petroleum, pharmaceutical, light industry, metallurgy and other industrial production in the vertical cylindrical equipment vapor-liquid separation device. It can also be used in the desulfurization and other productions to remove oil mist, toxic and poisonous gas.
Working principle of demister pad
When the gas with mist rises at a constant speed and passes through the wire mesh, the rising mist will collided with the mesh filament and attached to the surface filament due to the inertia effect. The mist will be diffuse on the filament surface and the droplet will follow along the filaments of the two wire intersection. The droplet will grow bigger and isolate from the filament until the droplets gravity exceeding gas rising force and liquid surface tension force while there is little gas passing through the demister pad.
Separate the gas in the droplets can improve the operating condition, optimize process indicators, reduce corrosion of the equipment, extend equipment life, increase the amount of processing and recovery of valuable materials, protect the environment, and decrease air pollution.
DPZ-02: Round shape embedded demister pad.
DPZ-03: Circle shape embedded demister pad.
Features of demister pad
Selected wire mesh form
Selected demister pad forms have four categories: standard type, efficient type, high penetration type and shock absorber type.
Specifications of standard type demister pad Item Wire type Wire sizeDPZ-04: Flattened type standard demister pad.
DPZ-05: Ginning type standard demister pad.
Specifications of efficient type demister pad Item Wire type Wire sizeDPZ-06: Rectangular shape efficient demister pad.
DPZ-07: Round shape efficient demister pad.
Specifications of high-penetration type demister pad Item Wire type Wire sizeDPZ-08: High penetration type demister pad detail.
DPZ-09: High penetration type demister pad.
Specifications of shock absorber type demister pad Item Specification Filament specificationsDPZ-10: Shock absorber type demister pad detail.
DPZ-11: Shock absorber type demister pad.
Domestic standards
Wire mesh demister pad domestic standards are divided into HG5- (, ) - 81, HG/T -, HG/T -98.
DPZ-12: SP type demister pad.
DPZ-13: DP type demister pad.
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DPZ-14: HR/HP type demister pad.
Type Standard wire specification SP 0.1 mm + 0.03 mm × 0.4 mm DP 0.1 mm + 0.02 mm × 0.3 mm HR 0.23 mm + 0.03 mm × 0.4 mm. HP 0.1 mm + 0.03 mm × 0.4 mmMesh pad installation
There are two kinds of wire mesh demister pad, which are disk shaped demister pad and bar type demister pad.
According to different using condition, it can be divided into upload type and download type. When the opening is located in the above of the demister pad or when there is no opening but has flange, you should choose the upload demister pad.
When the opening is in the below of the demister pad, you should choose the download type demister pad.
DPZ-15: Upload type demister pad.
DPZ-16: Download type demister pad.
Schematic of demister pad
DPZ-17: Horizontal separation tower.
DPZ-18: Spherical separation tower.
DPZ-19: Scrubber.
DPZ-20: Distillation column.
DPZ-21: Vertical separation column.
DPZ-22: packed tower.
After using for a long time, the demister pad will clog or prone to flooding and the pressure drop will increase. All these because of the particles in the gas blocks the demister pad. So you need maintain the demister pad properly and regularly.
Maintenance method: clean the demister pad. As we all know, the dilute acid on the demister pad will shorten the service life of demister pad, so we should place the demister pad in the natural state or under the sunlight
What is demister pad?
Demister pad, also known as mist eliminator, is essential in many process operations for the removal of entrained material in vapor flows. Demister pads provide a wide range of solutions suitable for any application.
It is made of knitted wire mesh forms primary parts for the mist collection systems. We offer a full line of mist collectors including continuous duty centrifugal.
Demister pads or collectors are used to collect the light mist and swarf. A number of design layouts and filter choices are provided for both flexibility and expandability. It consists of pad sets, or a variety of pleated panel designs. The filter media is normally knitted wire mesh made of metal or synthetic fiber.
Operation of a mist eliminator is based on having a large number of obstacles intercepting entrained droplets in a vapor flow. This large number of obstacles must provide a minimum drop in pressure over the removal system.
Demister pads are fabricated from knitted materials with interlocking asymmetrical loops of metal or plastic with typical diameters being 0.1 - 0.3 mm. By careful choice of wire diameter, we have produced demisters with extremely high free volumes (typically 98 - 99%) along with very high removal efficiency and low pressure drop.
How a Mist Eliminator Works
Elimination of Mist Eliminator is dependent on droplet size:5 - 9 microns 99%>10 microns 99.5% most of the weight of entrained mists tend to be associated with the larger mist particles (larger than 5 - 10 μm) thus providing greater that 99.99% weight removal.
Why use Demister Pad/Mist Eliminators
Our products are known among our customers for good durability. We have also a good track record for having negligible annual production errors for the past few years. With good experience, you can be sure to get the best quality and durability for mist eliminators.
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