This article's table of contents introduction:
- Breakdown of the Designation
- Key Features & Application
- Technical Specifications (General for FBCDZ Series, No34)
- Additional Context
- Summary
The designation FBCDZ-10-No34 refers to a specific type of large industrial fan used in underground coal mining. Here is a breakdown of what this code means and the fan's primary characteristics:
Breakdown of the Designation
- F: Fan.
- B: Explosion-proof (防爆, Fángbào). The motor and critical components are designed to prevent ignition of explosive gases (methane) present in coal mines.
- C: Counter-rotating (对旋, Duìxuán). The fan consists of two stages of impellers that rotate in opposite directions.
- D: Electric motor drive (电动机驱动). The fan is driven directly by electric motors (one per impeller stage, typically mounted inside the fan casing).
- Z: Axial flow (轴流式). The air moves parallel to the fan's axis.
- 10: The series or design revision number (often indicates the blade profile or aerodynamic design generation).
- No34: The impeller diameter is 34 dm (3400 mm). "No" stands for "Number," and the number following it represents the impeller diameter in decimeters.
Key Features & Application
Primary Application: This fan is a Main Ventilator (Main Fan) for underground coal mines. Its critical job is to continuously supply fresh air to the mine workings and exhaust stale, potentially explosive air (containing methane) to the surface.
Why Counter-Rotating (C)?
- High Efficiency: The counter-rotating design allows for higher pressure generation in a compact axial length compared to a single-stage axial fan.
- Stall Resistance: It offers a stable operating range and is less prone to stalling, which is critical for reliable mine ventilation.
- Direct Drive: Eliminates the need for complex belts or gearboxes, reducing maintenance.
Why Explosion-Proof (B)?
- Safety: The motors and all electrical components are enclosed in certified explosion-proof housings. This ensures that any internal spark or arc cannot ignite the surrounding methane-air mixture, which is a constant hazard in coal mines.
Technical Specifications (General for FBCDZ Series, No34)
For a fan of this size (3.4 meter diameter), the specifications are substantial:
| Parameter | Typical Value (Approximate) |
|---|---|
| Airflow (Volume) | 40 - 160+ m³/s (cubic meters per second) |
| Static Pressure | 1,000 - 5,000+ Pa (Pascals) |
| Motor Power (per motor) | 200 - 800+ kW (two motors, one per stage) |
| Motor Speed | Typically 740 or 990 RPM (low speed, high torque) |
| Efficiency | >80% at design point (aerodynamically efficient) |
Additional Context
- Configuration: These fans are almost always installed with a reversible blade design (often hydraulically or manually adjusted) or are designed to be reversed by changing the direction of motor rotation. This allows the fan to reverse the airflow for emergency situations or certain ventilation requirements without a separate reversing shaft.
- Installation: The fan is mounted on a concrete foundation at the mine surface, connected to the mine's exhaust shaft via a diffuser and evase.
- Standards: Must comply with stringent national and international standards for mining safety, such as GB/T (Chinese national standards) and ATEX or IECEx (international explosion protection) for the specific mining jurisdiction.
Summary
The FBCDZ-10-No34 is a large, powerful, and critically important main mine exhaust fan. Its explosion-proof, counter-rotating axial flow design makes it a highly efficient and safe choice for providing essential ventilation in hazardous underground coal mine environments.
