To select a centrifugal fan suitable for high-temperature working conditions, the core is to accurately match the fan’s material, structure, and performance to the actual high-temperature scenario. It needs to be implemented in three steps: "clarify working conditions → lock key indicators → screen core configurations". The specific key points are as follows:
1. Step 1: Accurately clarify the core parameters of high-temperature working conditions (foundation for fan selection)
- Confirm gas temperature: Specify the maximum temperature during long-term operation (e.g., 300℃ for conventional scenarios, 800℃ for high-temperature scenarios). This directly determines material selection (e.g., Q235 with high-temperature coating can be used for ≤400℃, while 310S heat-resistant steel is required for ＞600℃).
- Confirm gas characteristics: Determine whether the gas contains dust (e.g., kiln flue gas) or corrosive components (e.g., chemical waste gas). For dust-containing gas, a dust-proof impeller should be selected; for corrosive gas, corrosion-resistant alloy materials are needed.
- Confirm core performance requirements: Define the required air volume and air pressure (which need to be corrected based on gas density at high temperatures to avoid undersized selection), and whether 24/7 continuous operation is required (which affects the durability requirements for motors and bearings).
2. Step 2: Lock key adaptation items for high-temperature scenarios (key to avoiding problems)
- Material heat resistance: Heat-resistant materials of corresponding temperature grades should be selected for impellers and casings (e.g., 16MnR for 300-500℃, Cr25Ni20 for 500-800℃, 310S for ＞800℃). High-temperature special bearings (e.g., SKF high-temperature series) should be used, and lubricating grease with heat resistance ≥200℃ (e.g., molybdenum disulfide-based grease) should be adopted.
- Cooling system: When the temperature is ＞400℃, the motor must be equipped with an independent cooling system (air cooling is suitable for low-dust scenarios, and water cooling is suitable for high-temperature and high-humidity scenarios). The bearing box should be equipped with a cooling jacket to prevent bearings from seizing due to high temperatures.
- Heat deformation-resistant structure: The impeller must have reserved gaps for thermal expansion and contraction. The casing should adopt a segmented design or be equipped with an expansion joint to reduce vibration and air leakage caused by component deformation at high temperatures.
3. Step 3: Screen guarantee configurations for long-term stability (key to durability)
- Monitoring and protection: Priority should be given to models with motor/bearing temperature monitoring and vibration monitoring functions, which support automatic alarm or shutdown in case of over-temperature or excessive vibration to avoid sudden damage.
- Sealing performance: For dust-containing or high-temperature gas scenarios, a double-sealing structure (labyrinth seal + packing seal) should be selected to prevent efficiency reduction due to air leakage or dust entering the bearing box.
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