FBCDZ-12-No30 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This article's table of contents introduction:

1. Full Name Decoding
2. Primary Application
3. Key Technical Features
4. Performance Characteristics (General Estimations for this Size)
5. Common Motor Options
6. Advantages of this Model
7. Typical Manufacturer

Based on the model number you provided, FBCDZ-12-No30, here is a detailed technical breakdown and description of this specific piece of mining equipment.

Full Name Decoding

• F: Fan
• B: Explosion-Proof (防爆)
• C: Counter-Rotating (对旋)
• D: Motor Direct Drive (电机对旋驱动)
• Z: Axial Flow (轴流式)
• 12: The Motor Pole Number (12 poles). This is critical as it determines the motor's synchronous speed. For a 50Hz power supply, a 12-pole motor runs at ~490 RPM. For a 60Hz supply, it runs at ~590 RPM.
• No30: The Impeller Diameter in decimeters. No30 means the impeller diameter is 30 dm = 3000 mm (3 meters or ~118 inches) .

Primary Application

This fan is specifically designed for main mine ventilation (as opposed to auxiliary or local ventilation). Its primary role is to continuously and safely exhaust or blow air through the entire mine shaft and underground workings.

Key Technical Features

1. Explosion-Proof (B) : All electrical components (motor, wiring, junction box) are enclosed in explosion-proof housings. This is non-negotiable for safe operation in coal mines where methane gas may be present.
2. Counter-Rotating (C) : The fan has two impellers (rotors) mounted on the same axis but rotating in opposite directions.
   • No Stator Vanes: Unlike single-stage axial fans, counter-rotating fans do not need guide vanes. The second rotor recovers the energy from the swirl created by the first rotor.
   • Higher Efficiency: This design is very aerodynamically efficient, generating high pressure with lower energy consumption compared to older single-stage designs.
   • Compact Design: It is shorter in length than a comparable two-stage fan with inter-stage guide vanes.
3. Direct Drive (D) : The impellers are mounted directly on the motor shafts. There are no belts, pulleys, or couplings to maintain. This eliminates a major source of mechanical failure and power loss, increasing reliability.
4. 12-Pole Motor: This is a low-speed motor. Large mine fans run at low speeds to reduce noise, wear, and vibration while moving massive volumes of air at moderate pressures.
5. No30 Size (3-meter diameter) : This is a very large fan. It is designed for major mining operations with extensive underground networks requiring huge air volumes (often in the range of 300 to 800 cubic meters per second or more, depending on motor power and system resistance).

Performance Characteristics (General Estimations for this Size)

Note: Exact performance depends on the manufacturer's specific blade angle and motor power (kW) options.

• Air Volume (Q): Typically 100 - 600 m³/s (212,000 - 1,270,000 CFM)
• Static Pressure (P): Typically 1,500 - 4,500 Pa (6 - 18 inches w.g.)
• Motor Power: Options usually range from 2 x 110 kW (2 x 150 HP) to 2 x 500 kW (2 x 670 HP) or more.
• Efficiency: Peak static efficiencies are typically in the range of 80% - 85% .

Common Motor Options

For a 12-pole motor at 50Hz (~490 RPM), you would commonly see these power configurations for a No30 fan:

• 2 x 160 kW
• 2 x 200 kW
• 2 x 250 kW
• 2 x 315 kW
• 2 x 400 kW

Advantages of this Model

1. High Reliability: Direct drive eliminates belts and couplings.
2. High Efficiency: Counter-rotating design provides excellent aerodynamic efficiency.
3. Simple Maintenance: Fewer moving parts and direct access to the primary components.
4. Reversible Airflow: By changing the rotation direction of both motors, the fan can reverse the mine airflow (usually at ~60% of forward flow capacity) without the need for costly and complex reversal ducts or doors.

Typical Manufacturer

This model number is a standard Chinese designation (GB/T standard). A very well-known and reputable manufacturer of this specific fan is Shandong Metallurgical Machinery Co., Ltd. and other major Chinese mining fan suppliers.

In summary: The FBCDZ-12-No30 is a heavy-duty, explosion-proof, direct-drive, counter-rotating axial fan with a 3-meter impeller and a low-speed 12-pole motor, designed for primary ventilation in large coal mines.