Hot Gas Sintered Metal Felt Filter

Saifilter Hot Gas Sintered Metal Felt Filter processes metal wires into metal fibers through a cluster drawing. The metal fibers are then made by non-woven fabric laying, high-temperature sintering, and other processes and then welded. The Hot Gas Sintered Metal Felt Filter comprises layers of fibers with different pore sizes to form a gradient three-dimensional porous structure, and the fibers are welded structures.

The micropores are not easily deformed, the filtration efficiency is stable, and the filtration resistance is low. Designed and manufactured to precise bubble point specifications, tight thickness tolerances, and permeability uniformity, ensuring reliable filtration performance, effective backwash, and long operating life. As one of the top-performing Gasification Filters, it is an ideal choice for high-temperature flue gas dust removal applications.


The standard structure of Saifilter Standard Hot Gas Cleaning Filters uses a core support layer of perforated porous tubes to meet the strength requirements. One end is closed, and the other is open. A flange is welded at the open end to facilitate installation and fixation and ensure the sealing of high-temperature synthetic gas.

High Temperature Saifilter Metal Fiber Cartridge Manufacturing Process

Filtration Medium
Core Support Cage
Welded flange connection at end

High-Temperature Capability

Material CapacityUnitSS316L310S0Cr21A6
Material Densityg/cm37.987.987.16
Oxidation Temperature400600800
Air Permeabilitym3/m2/min21-2721-2721-27
Filtration Efficiency%>99.99>99.99>99.99
Tensile StrengthN/mm2≥20≥20≥20
Test standard: BS 2782 Application environment: Al2O3 dust, wind speed 1.75-3m/min, dust density 10g/m3

High-Temperature Filters Element How they work

Saifilter Hot Gas Filter Candles are installed on the isolation plate inside the high-temperature filtration unit, which separates the clean side from the dirty side of the ventilation ducts. Dust-laden high-temperature gases enter the filtration chamber from the polluted side and are drawn into the filter element by an external fan.

Dust particles are captured on the outer surface of the filter cartridge, and the filtered hot air is discharged through the flange port on the inner surface of the filter cartridge, reaching the clean side. The tiny particles formed on the surface of hot gas process filters to aid in filtering more dust particles from the high-temperature flue gas. The self-cleaning cycle is triggered when the accumulated dust forms into cake-like blocks and the pressure drop inside the filter unit reaches the design requirements.


Installation of Pleated Hot Gas Filter Element 

Pollutants RemovedTemperature Range
Particulate matter  (PM)150 to 900   (300 to 1650)
PM+ SO2, HCI or other gasses150 to 900  (300 to 1500)
PM+NOx150℃ to 900℃   (300℉ to 750℉)
PM+ NOx+ SO2, NCI other acid gases150℃ to 900℃   (450℉ to 750℉)

Temperature Distribution Of Particulate Matter 

Filter Layer Construction Type


Cylindrical Surface Type


Cylindrical Pleated Type



ModelOD (mm)ID (mm)Length (mm)Filtration area (m2)



A (flange ID)108mm,118mm,143mm
B (flange OD)142mm,153mm,177mm
C (flange thickness)34mm 
D (flange hole diameter)15mm,19mm 
Number of holes4/6
OtherSpecial sizes are available upon request


Open End Standard Flange Connections


Open End Customization Venturi Connections

Sealing Gasket

It is crucial to select a high-temperature gasket that matches your process system. It will determine whether the element's seal is reliable in the long term, preventing any leakage over time. Suitable seals and venturi are available upon request.


Graphite composite gasket


Reinforced Graphite Gasket With Metal Insert

Installation Of Hot Gas Filter Element On Site For Catalyst Recovery Project



  • Longer lifespan
  • Enables maximum reduction of service downtime due to online cleaning
  • Maintains consistent filtering performance even under high fluctuation conditions


  • Coal Chemical Synthesis Gas Purification
  • Industrial Fuel Gas Purification
  • High-Temperature Flue Gas Treatment in Coal-Fired Power Plants
  • High-Temperature Flue Gas Treatment in Metallurgy
  • Waste Incineration Power Generation
  • Recycling of Valuable Metals
  • Catalytic Gas Purification in Petrochemical Industry

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A Hot Gas Sintered Metal Felt Filter is a filtration device, which is fabricated through a process of sintering metal fibers at high temperatures. The process results in a porous yet strong structure, which is capable of filtering out fine particles and impurities from hot gases in various industries such as chemical, petrochemical, and environmental sectors.

Hot Gas Sintered Metal Felt Filters offer several advantages over traditional filters, including:

  • High-temperature resistance: They can withstand extremely high temperatures, making them suitable for hot gas filtration applications.
  • Excellent Filtration Efficiency: These filters can trap finer particles than traditional media, resulting in cleaner emissions.
  • Long Life Span: Due to their robust construction, these filters tend to have a longer service life.
  • Easy Cleaning: They can be easily cleaned and reused, making them cost-effective in the long run.

Hot Gas Sintered Metal Felt Filters are commonly used in several industries, including:

  • Chemical and Petrochemical Industries: For filtration of process gases and removing impurities.
  • Environmental Sector: In air pollution control systems to filter out harmful pollutants from industrial exhaust gases.
  • Metallurgical Industry: For filtering gases during various metallurgical processes.
  • Power Generation: In gas turbines and other power generation equipment, ensure the purity of the gases used.

The sintering process, which involves heating the metal fibers to temperatures below their melting point to bond them together, contributes to the filter's efficiency by creating a porous structure with interconnected voids. This structure allows for excellent filtration efficiency, as it can capture fine particles while maintaining a good flow rate. Moreover, the sintering process imparts enhanced mechanical strength and thermal resistance to the filter, making it capable of operating in harsh environments.

Maintaining and cleaning a Hot Gas Sintered Metal Felt Filter involves a few steps to ensure its long-lasting performance:

  • Regular Inspection: Regularly check whether the pressure difference fluctuation of the filtration unit is abnormal.
  • Cleaning: Depending on the impurities caught, the filter can be cleaned using suitable solvents or backflushing to remove the accumulated particles.
  • Replacement: If leaks in the filter media or the designed working life is reached, it should be replaced to maintain filtration efficiency.
  • Consult Manufacturer Guidelines: Always refer to the manufacturer's guidelines for specific maintenance and cleaning procedures to prevent any potential damage during the cleaning process.



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