This article's table of contents introduction:
- Decoding the Model Number: FBCDZ-6-No26
- Key Characteristics of this Fan Type
- Advantages for Coal Mine Use
- Summary for Practical Use
This is a highly specific piece of industrial equipment identification. Here is a breakdown of the designation FBCDZ-6-No26 for this coal mine exhaust fan.
Decoding the Model Number: FBCDZ-6-No26
The fan's model number is a standard Chinese industrial nomenclature that describes its major features.
- F : Fan (风机)
- B : Explosion-Proof (防爆) - This is critical for coal mines where methane gas may be present.
- C : Counter-Rotating (对旋) - This means the fan has two impellers (stages) that rotate in opposite directions to generate high pressure without the need for stationary guide vanes.
- DZ : Axial Flow (轴流式)
- 6 : Impeller Blade Count (usually 6 blades per stage)
- No26 : Impeller Diameter (叶轮直径) - 26 dm (260 cm or 2.6 meters) . This is the diameter of the impeller, a key size indicator.
Key Characteristics of this Fan Type
This is a specialized, high-capacity ventilation fan designed specifically for underground coal mining.
Primary Application:
- Main Mine Ventilation (Exhaust): The "Exhaust" designation means it is installed at the mine's return air shaft to suck stale, dusty, and potentially explosive air out of the mine and vent it to the atmosphere.
- Coal Mines Only: The explosion-proof rating (B) makes it suitable for gassy mines (high methane content).
Explosion-Proof Design (The "B"):
- The motor, casing, and electrical connections are designed to contain any internal methane explosion and prevent it from igniting the external mine atmosphere.
- Motors are typically air-cooled or have specialized cooling to prevent hot spots.
Counter-Rotating Design (The "C"):
- The fan has two rotors (impellers) mounted on a common axis but rotating in opposite directions.
- The first rotor imparts high velocity to the air.
- The second rotor captures the swirl from the first rotor and straightens the flow, converting the kinetic energy into pressure.
- Advantages: Higher pressure generation in a short axial length, no need for stationary vanes (reducing weight), and a flat performance curve (good for variable mine resistance).
Key Specifications (Typical for the No26 size):
- Impeller Diameter: 2600 mm (2.6 meters / 8.5 feet).
- Motor Power: Typically very high. Depending on the specific configuration (angle of blades), it can range from 2 x 110 kW to 2 x 400 kW (two motors, one for each stage). A common configuration is 2 x 355 kW.
- Air Volume: Usually in the range of 4,000 to 20,000 m³/min (140,000 to 700,000 CFM).
- Static Pressure: Typically 1,500 to 5,000 Pa (6 to 20 inches w.g.).
- Efficiency: Counter-rotating axial fans can achieve peak efficiencies of 80–85% or higher at their design point.
Advantages for Coal Mine Use
| Feature | Benefit |
|---|---|
| Explosion-Proof | Safe operation in gaseous methane environments. |
| High Pressure, High Volume | Can overcome the high resistance of long, deep underground workings. |
| Reversible Airflow | Most axial fans can reverse airflow direction (by reversing the motor rotation and changing blade pitch if needed). Crucial for emergency reversal of ventilation. |
| Compact Design | Shorter axial length compared to axial fans with stationary vanes. Easier to install in underground or surface shafts. |
| Low Noise (Relatively) | Counter-rotating design generally runs quieter than centrifugal fans of similar capacity. |
| Reliable Start-up | Counter-rotating fans have a lower starting torque requirement than conventional axial fans. |
Summary for Practical Use
If you are dealing with an FBCDZ-6-No26, you are working with a large, heavy industrial fan often weighing several tons, requiring a high-voltage electrical supply (typically 660V, 1140V, or 6kV/10kV), and requiring regular maintenance checks on:
- Blade Angle Adjustment: The pitch of the blades can be adjusted (usually while stopped) to change the air volume/pressure.
- Bearing Condition: The motor bearings and impeller bearings require lubrication.
- Vibration Monitoring: Critical for detecting impeller imbalance or bearing failure.
- Motor Insulation: Must be high-grade for explosion-proof and moisture-resistant applications.
This is a workhorse of the coal mining industry, designed for continuous 24/7 operation under harsh conditions.
