This article's table of contents introduction:
- Breakdown of the Model Number: FBCDZ-12-No34
- Function of this Fan
- Key Features of Counter-Rotating (FBCDZ) Design
- Typical Applications & Scale
- Summary
This is a specific model designation for a large industrial ventilation fan used in underground coal mining. Let's break down what the model number FBCDZ-12-No34 means, its function, and its key features.
Breakdown of the Model Number: FBCDZ-12-No34
This type of numbering is standard for Chinese mining fans (GB/T standards).
- F – Fan (风机)
- B – Explosion-Proof (防爆) – The motor and all components are designed to prevent sparks from igniting methane gas.
- C – Counter-Rotating (对旋) – It has two impellers (stages) rotating in opposite directions. This eliminates the need for stationary guide vanes, creating high pressure and high efficiency, especially in series operation.
- DZ – Main / Local Ventilation Fan (主/局扇) – This is a main mine ventilation fan for the entire mine or a large district.
- 12 – Impeller Blade Count – Each of the two stages has 12 blades.
- No34 – Impeller Diameter – The impeller diameter is 34 decimeters (3.4 meters / 134 inches). This is a very large fan.
Function of this Fan
The primary job of this FBCDZ-12-No34 fan is to provide 100% of the necessary ventilation for a coal mine. Specifically:
- Exhaust / Extraction: It is a mine exhaust fan, meaning it is installed on the surface at the mine's exhaust shaft. It pulls "used" air (containing methane, coal dust, and depleted oxygen) out of the underground workings.
- Explosion Protection: Because the air it moves contains explosive methane gas, the fan is inherently explosion-proof. The motor and electrical components are sealed and rated to not ignite an external gas-air mixture.
- High Volume & Pressure: Counter-rotating axial fans are excellent for handling the high air volume (often 10,000+ m³/min) needed in a large coal mine while also overcoming the high resistance (pressure) of long, deep mine shafts.
Key Features of Counter-Rotating (FBCDZ) Design
- High Efficiency: The rear impeller recovers the swirl energy from the front impeller, making the fan much more efficient than a single-stage fan or even some multidirectional designs.
- Direct Drive (No Belts or Gears): The motors are directly connected to the impellers inside the fan housing. This eliminates belt slippage, reduces maintenance, and increases safety.
- Controllable Pitch: Many models (including likely this one) have variable-pitch blades. During installation, the angle of the blades can be adjusted to precisely match the mine's required airflow and pressure without changing the fan's speed.
- Compact: For the pressure and volume it produces, the counter-rotating design is physically shorter than a traditional single-stage fan with guide vanes.
Typical Applications & Scale
- Application: Main exhaust fan for large, medium, and super-large coal mines.
- Location: Surface ventilator house at the exhaust air shaft.
- Power: Matched with high-voltage explosion-proof motors (typically 6kV or 10kV). The power for a No34 fan is substantial, likely in the range of 2 x 450 kW to 2 x 1000 kW (two motors, one for each impeller stage).
- Airflow: Expect a capacity range of roughly 100 m³/s to 250 m³/s (6,000 – 15,000 m³/min or 212,000 – 530,000 CFM) depending on installed blade angle.
- Pressure: Capable of generating 1,500 to 4,500 Pa of static pressure.
Summary
The FBCDZ-12-No34 is a high-capacity, explosion-proof, counter-rotating axial flow fan. It is a critical piece of safety equipment for a large underground coal mine, designed for 24/7 operation to continuously remove hazardous methane gas and coal dust while providing fresh air to miners. Its "No34" designation indicates it is a very large unit with a 3.4-meter diameter impeller.
