FBCDZ-10-No24 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This article's table of contents introduction:

1. Model Name Breakdown (Designed to be read left-to-right)
2. Application & Use Case
3. Key Technical Specifications (Typical for FBCDZ-10-No24)
4. Advantages of the Counter-Rotating (C) Design
5. Environmental Conditions for Use
6. Common Variations / Ordering Information
7. Example of a full specification line:
8. Safety Note

This is a highly specific and technical model designation for a piece of industrial mining equipment. Here is the breakdown of what FBCDZ-10-No24 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan means, along with its typical specifications and application.

Model Name Breakdown (Designed to be read left-to-right)

• F: Fan
• B: Explosion-Proof (防爆)
• C: Counter-rotating (对旋)
• D: Motor directly connected (电机对旋) or in some older naming conventions, "D" may indicate a specific structural type.
• Z: Main fan for a mine (主扇)
• -10: The impeller diameter in decimeters. 10 dm = 1000 mm (1 meter). Note: This is the diameter of the impeller blades.
• -No24: The series or model number (often representing the fan's specific aerodynamic profile or blade design from the manufacturer).
• Coal Mine Exhaust: Used for ventilating return air from underground coal mines.
• Explosion-Proof: The motors and structural components are rated to contain internal explosions and prevent ignition of methane/coal dust in the mine air.
• Counter-Rotating Axial Flow Fan: Two axial impellers rotate in opposite directions on a common axis. This design generates high pressure without requiring stationary guide vanes (stators).

Application & Use Case

This fan is designed for main mine ventilation (exhaust). It is placed at the mine shaft outlet to pull contaminated air (gas, dust, heat) out of the underground workings.

Primary Purpose:

• Exhaust (Negative Pressure): It creates a vacuum in the return airway, drawing foul air out of the mine.
• Handling Hazardous Atmosphere: It must safely handle air with high methane concentration. The "Explosion-Proof" rating is mandatory for this.
• Long-Distance Ventilation: The counter-rotating design allows high pressure to overcome the resistance of long, narrow underground tunnels.

Key Technical Specifications (Typical for FBCDZ-10-No24)

• Impeller Diameter: 1000 mm (1.0 m)
• Airflow Range: Typically 20 – 50 m³/s (depending on rotational speed and blade angle).
• Static Pressure Range: Typically 500 – 2500 Pa (Pascals).
• Motor Power: Usually 2 × 30 kW to 2 × 75 kW (Two motors, one for each impeller).
• Motor Type: Special explosion-proof motors for coal mines (e.g., YBF or YBFe series).
• Working Condition: Continuous operation, often 24/7, in high-humidity, potentially abrasive environments.

Advantages of the Counter-Rotating (C) Design

1. High Efficiency: Eliminates the stator (guide vane) losses found in single-stage axial fans.
2. High Pressure: Two impellers in series generate much higher pressure than a single impeller of the same diameter.
3. Compact Length: Shorter axial length than a single-stage fan with an inlet guide vane system.
4. Reversibility: The airflow direction can be reversed by changing the rotation direction of the motors, which is critical for mine emergency procedures (e.g., reversing airflow to clear an explosion or fire).

Environmental Conditions for Use

• Atmosphere: Must be able to handle explosive gas mixtures (Methane, CH4) up to 0.5-1.0% (or higher, per local safety regulations).
• Temperature: Standard range: -20°C to +40°C.
• Altitude: Typically below 1000m unless specially designed.

Common Variations / Ordering Information

When ordering or specifying this fan, you would typically need to provide:

1. Blade Installation Angle: (e.g., 35°, 40°, 45°) - This determines the fan's operating point (pressure vs. flow).
2. Motor Speed: (e.g., 980 rpm, 740 rpm, 1480 rpm).
3. Voltage: (e.g., 380V, 660V, 1140V - common in coal mines).
4. Optional Features: Inlet screens, silencers, diffusers, contra-rotating blade pitch adjustment mechanism.

Example of a full specification line:

FBCDZ-10-No24, Power: 2x45kW, Speed: 980rpm, Voltage: 660V/380V, Explosion-proof grade: ExdI.

Safety Note

Because these fans handle explosive mine gas, the casing, motor housing, and wiring must comply with strict national standards (e.g., GB/T 3836 in China, or similar ATEX/IECEx standards). The term "Explosion-Proof" means the enclosure can contain an internal explosion and prevent the ignition of the surrounding atmosphere.