Demister Pad
Saifilter Demister pad removes micron liquid particles from liquid/vapor fluids produced in industrial processes. To prevent liquid particles from flowing into downstream equipment and causing damage to parts.
Saifilter Mist Eliminators can be divided into Wire Mesh Demister, Stainless Steel Demister Pads, Mesh Pad Mist Eliminators, Vane Mist Eliminators, PVC Mist Eliminators, PP Demister Pads, and Oil Demister Filters according to the specific material and structure type. It is usually installed in a separation or distillation tower in combination with Structured Packing and Random Packing. Please choose the best Dumpster Pad according to your specific application.
Saifilter produces Mist Eliminators in various shapes and sizes, suitable for horizontal or vertical installation to meet different working conditions. Mist eliminator media are manufactured from metal monofilaments approximately 0.011" or 0.006" in diameter by braiding and interlocking to form a Wire Metal Mesh Pad with high porosity (97% to 99+%) and uniform density. A less dense mesh can better capture small-diameter droplets.
Demister Filter
Demister Filter, also known as mist eliminator filter or dehumidifier, is an important component in the gas-liquid separation industrial process. Used to intercept tiny droplets from gas flow media and to filter gases.
Special Alloy Demister Pad
Demister pad in the vessel can choose high-value alloy mesh pad mist eliminator. It can perform well in various concentrations of nitric acid, organic acids, chlorides, wet chlorine, and alkali.
Metal Panel Demister Filter
The filter media consists of metal mesh coils placed in a stainless steel frame. This type of filter is reusable and cleanable and should be used to remove excess water vapor before the steam enters the turbine.
PP Demister Pad
Polypropylene is a lightweight filter media. The mist eliminator is available in various pore sizes and can capture droplets escaping with steam. It is resistant to NH3 and H2SO4 steam and has an average operating temperature of no higher than 60°C.
Metal Panel Demister Filter
PTFE Demister Pad, also called PTFE mist eliminator, has excellent chemical resistance and the average operating temperature is between -196℃ and 260℃. Available in different shapes and sizes to suit your specific application requirements.
Saifilter Demister Pad Technical Data
| Item | Density (kg/m3) | Free Volume (%) | Surface Area (m2/m3) | Application |
|---|---|---|---|---|
| PD-1 | 80 | 99 | 158 | Moderate fouling, minimum press drop, dirty service |
| PD-2 | 120 | 98.5 | 210 | Light fouling, high velocity, dirty service |
| PD-3 | 144 | 98.2 | 280 | Heavy duty, e.g. oil & gas separators |
| PD-4 | 128 | 98.4 | 460 | Light fouling, high velocity, dirty service |
| PD-5 | 193 | 97.5 | 375 | General purpose, optimum efficiency & pressure drop, heavy duty |
| PD-6 | 300 | 96.2 | 575 | Fine mist condition, super dense |
| PD-7 | 390 | 95 | 750 | Fine mist condition, super dense |
| PD-8 | 220 | 97.2 | 905 | General purpose, optimum efficiency & pressure drop, heavy duty |
| PD-9 | 432 | 94.5 | 1780 | Fine mist condition, super dense |
| PD-10 | 220 | 97.2 | 428 | General purpose, optimum efficiency & pressure drop, heavy duty |
| PD-11 | 160 | 96.7 | 5000 | Fine mist condition, super dense |
Vessel Disc Demister
Long strip polyethylene pad demister
Manufacturing Materials
| Material | Products Separated |
|---|---|
| SS304 | For nitric acid, water steam |
| SS304L | For petroleum Fractions |
| SS316 | For fatty acids, reduced crude |
| SS316L | Reduced crude containing acid & other corrosive |
| Copper | Alcohol, Aldehyde, Amines |
| Monel | For caustic soda & other alkali, dilute acid |
| Nickel | For caustic soda, food product |
| Alloy 20 | Nitric acid, alkaline PH |
| Teflon FEP | For Highly corrosive conditions |
| Hostaflon PTFE | For Highly corrosive conditions |
| Inconel 825 | For dilute acid media & alkaline solution |
| Inconel 625 | For phosphoric and fatty acid |
| Polypropylene | For hydrilic acid, corrosive service at moderate temperature |
| P.V.D.F. | Corrosive Service for Temperature 140 °C |
| P.T.F.E. / FEP / PFA / ETFE / ECTFE | For highly corrosive and high temperature |
| Hostaflon | Sulphuric acid plant, temperature up to 150 °C |
| Glass Wool | For very fine mists |
Ring De Mister Pads
PTFE Disc De mister pads
Saifilter Demister Pad Standard Knitted Mesh Type
There are many possible wire mesh demister variations, including:
- Wire diameter
- Number of wires together
- Number of demister mesh layers
- Size of mesh stitch
- The thickness of the demister mesh pad
| Type | Wire diameter (mm) | Specific Surface Area (m2/m3) | Bulk Density (kg/m3) | Voidage | |
|---|---|---|---|---|---|
| SP | Flat Wire | 0.1x 0.4 | 475 | 168 | 0.9788 |
| Round Wire | 0.23 | 320 | |||
| DP | Flat Wire | 0.1x 0.3 | 626 | 186 | 0.9765 |
| Round Wire | 0.19 | 484 | |||
| HR | Flat Wire | 0.1x 0.4 | 313 | 134 | 0.9875 |
| Round Wire | 0.23 | 217 | |||
| HP | Round Wire | 0.08 - 0.22 | 403 | 128 | 0.9839 |
Standard Mesh Styles
Mist eliminator filter media are knitted mesh made of interlocking metal or plastic monofilaments. These demister pads can be cleaned and reused. Saifilter offers four different types of knitted mesh media depending on the design requirements of the application.
Schematic Diagram of Knitted Mesh Interlock Types
Simplified View of the Saifilter Demister Pad Configured in Separator Vessels
Correct configuration of Mist Eliminators in specific applications is crucial. All Demister Pads are segmented and designed to facilitate installation through manholes. For the internal structure of the Vessel Demister, multiple factors should be considered, including the required cross-sectional area and geometric shape. The figure below shows the corresponding structural configurations of different Mist Extractors. It can be of any size or shape.
The performance of Mist Eliminators depends on uniform velocity distribution over the cross-sectional area. Ideally, work with minor fluctuations in flow rate to avoid leaving other sites unused.
Wire Mesh Demister Pad is preferably designed upstream of the outlet nozzle to avoid insufficient distance space. Steam tends to pass through the Demister Pad in the area closest to the outlet nozzle. First, the steam passes through the integral flow distributor in the downstream area, which can avoid the phenomenon that other regions of the demista pad are not used.
Mist Eliminators Installation Vertical Vessels
Mist Eliminators Installation Horizontal Vessels
Demister Pad Velocity Design
The capacity factor is determined empirically and is affected by a combination of factors, including the type and style of the mist eliminator, the geometry of the mist eliminator relative to the steam flow, operating pressure, fluid viscosity, and process parameters such as liquid surface tension. Taking a typical air-water system as an example, the capacity coefficient will be different under different environmental conditions. Typically, the capacity factor for vertical flow is approximately 0.35 ft/sec, while for horizontal flow, the capacity factor is about 0.42 ft/sec.
The Souders-Brown equation is still widely used to determine the appropriate flow rate for a given system. The Souders-Brown equation is as follows:
For most systems, the maximum allowable steam velocity, "V," is calculated according to the Souders-Brown equation below. It is recommended that the design speed should be 60-75% of “V” to account for surge and disturbance conditions. For most systems operating at 30-110% of the maximum allowable steam velocity for high-pressure and vacuum services, the constant "K" requires a specific design.
Saifilter Demister Pad Installation Diagram
The Knitted Mesh Demister Pad can be installed in different packed towers and equipment for different media and gas filtration and separation.
There are two main types of wire mesh demister pads: the disc-shaped demister pad and the bar-type demister pad. These demister pads can be further demister pads on their installation orientation: there are "Upload" and "Download" types. The choice between them depends on the specific installation conditions.
- Upload installation Demister Pads: These are chosen when the inlet or opening is above the pad. Additionally, if there is no opening, but it has a flange, the upload demister pad is the preferred choice.
- Download installation Demister Pads: On the other hand, download Demister pads are selected when the inlet or opening is positioned below the Demister pad.
The download types installation needs more supporting grids and accessories than the upload types. The above two options can ensure the optimal performance and efficiency of the Demister Pad and are consistent with the specific configuration of the application.
Upload Installation Demister Pad
Optional size range DN300- DN5200
Download Installation Demister Pad
Optional size range DN700- DN4600
Schematic of Demister Pad Installation
Vertical Distillation Column
Vertical Scrubber Mist Eliminator
Vertical Mist Eliminator for Wet Scrubber
Vertical Packed Tower
Horizontal Spherical Separation Tower
Horizontal mist extractor in separator Tower
Saifilter Demister Pad Provides ODM/OEM Services
As a qualified Demister Supplier, our technical design team with many years of experience can custom design and manufacture Mesh Pad Mist Eliminator according to your specific application and customize Demister Pads of different shapes, sizes, and gas-liquid separation efficiencies.
From prototype drawing design to final verification delivery, ensure each product meets standard requirements. Whether you need ODM or OEM services, Saifilter is honored to discuss and communicate with you to provide the most economical Demister Pad solution for your operation project.
If you want to replace your existing Demister Pad or Mist Eliminator Suppliers, Saifilter offers a variety of options. It can replace the original Mist Eliminators of well-known brands such as KOCH GLITSCH Demister, OTTO YORK Demister, etc.
Features
- Easy to install in existing containers
- Customize any size or shape
- Large specific surface area, high separation, and removal efficiency.
- Less maintenance and service are required.
- Adaptable to any corrosive and temperature conditions.
- Control exhaust emissions and reduce air pollution
- Eliminate or minimize equipment damage caused by corrosion
- Increase processing and recycling of valuable materials
Applications
- Mist eliminator process application
- Gas-liquid separator
- Distillation equipment
- Process absorbers, settlers, and scrubbers
- Chemical separators and extractors
- Oil and gas processing equipment
- Scrubbers, gas-liquid separators and receivers
- Refinery tower
- Liquid coalescer
- Pollution control equipment
- Two-phase eliminator compressor
- Liquid entrainment of equipment
- Product return system
The main principle of the Demister pad is coalescence by inertia. When tiny liquid entrainments pass through the tortuous path of a demister pad, they collide with each other between the gaps of knitted wires and condense into larger liquid droplets. Weight gain, droplets drop down. Thus, the mist will be separated from gas streams, and you can obtain pure gases.
Regular and proper maintenance of the demister pad is essential. After a period of use, the gas particles may clog your demister pad, and the pressure drop will increase. You need to clean it. Various cleaning methods will be mentioned here, including spray with cleaning liquids, boil, soak... to help you regain a clean demister pad while recovering its high filtration efficiency.
Please be more careful when you clean the demister pad, and carefully check for damage after each cleaning. Measure its wire diameter with a micrometer to confirm if there is any change compared to the brand new. In addition, a spare demister pad is necessary before you start cleaning.
The primary purpose of a demister pad is to remove liquid droplets and mist from gas streams. This is crucial in many industrial processes to ensure the purity of the gas, protect downstream equipment from corrosion or damage, and improve overall process efficiency. Demister pads provide a large surface area where the droplets can collide, merge, and grow large enough to be separated from the gas flow due to gravity. They are commonly used in petrochemical, natural gas, and chemical industries, particularly in distillation, absorption, and steam generation processes.
A demister pad is installed in a separator to enhance the separation of liquid droplets from the gas phase. Walls are used in many industrial processes to divide different stages of a fluid mixture, such as liquid-liquid, liquid-solid, or liquid-gas. In the context of gas-liquid separation, the demister pad is positioned where the gas phase exits the separator.
As the gas passes through the demister pad, the pad's mesh or coalescing material captures the liquid droplets suspended in the gas. These charged droplets coalesce on the pad's surface and fall back into the liquid phase due to gravity. This process significantly improves the separation efficiency, ensuring the exiting gas is free of liquid contaminants. Demister pads in separators are essential for process optimization, product quality control, and equipment protection.
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