Role of Iron-Chromium-Aluminum (FeCrAl) Sintered Felt in Infrared Burners

Role of Iron-Chromium-Aluminum (FeCrAl) Sintered Felt in Infrared Burners

Iron-Chromium-Aluminum (FeCrAl) sintered felt is a porous metal material widely used in infrared burners (also called radiant burners) due to its excellent high-temperature resistance, oxidation resistance, and gas permeability.

Its key functions include:

1. Uniform Gas Distribution & Stable Combustion

The porous structure of FeCrAl sintered felt ensures even dispersion of gas (e.g., propane, natural gas), preventing localized hot spots and enabling stable flame formation.

Acts as a flame holder, maintaining combustion efficiency and reducing pulsation or flame instability.

2. Enhanced Infrared Radiation

When heated, the FeCrAl felt emits infrared (IR) radiation efficiently, transferring heat directly to objects (rather than just heating the air).

This improves energy efficiency in applications like industrial drying, cooking appliances, and space heaters.

3. High-Temperature & Oxidation Resistance

FeCrAl alloys form a protective alumina (Al₂O₃) scale at high temperatures (up to 1300°C), preventing degradation in oxidizing environments.

Resists thermal cycling fatigue, making it durable for long-term use.

4. Flame Arrestor & Safety Function

The fine porous structure can act as a flame arrestor, preventing flashback (gas ignition traveling backward into the supply line).

5. Catalyst Support (Optional)

In catalytic infrared burners, FeCrAl felt can be coated with catalysts (e.g., platinum, palladium) to promote flameless combustion at lower temperatures, reducing NOx emissions.

Applications of FeCrAl Sintered Felt in Infrared Burners

Industrial Heating & Drying (e.g., paint curing, textile drying)

Commercial Cooking Equipment (e.g., grills, pizza ovens)

Space Heaters & Gas Fireplaces

Automotive & Aerospace Heating Systems

Advantages Over Alternatives (e.g., Ceramic or Stainless Steel Mesh)

✔ Higher porosity → Better gas diffusion & radiation efficiency.
✔ Superior thermal shock resistance → Longer lifespan than ceramics.
✔ Lightweight & flexible → Easier to install than rigid materials.

Conclusion

FeCrAl sintered felt is a critical component in infrared burners, ensuring efficient, stable, and safe combustion while maximizing radiant heat transfer. Its durability and high-temperature performance make it a preferred choice for industrial and commercial heating applications.