FBCDZ-12-No35 Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan

This article's table of contents introduction:

1. The Code Decoder (FBCDZ-12-No35)
2. The Context: "Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan"
3. Key Performance Characteristics (Inferred from the Model)
4. Critical Differences from Standard Fans
5. Summary

This is a highly specific industrial equipment description. Let's break down what this long name means and what the specifications indicate.

This describes a specific model of a heavy-duty ventilation fan designed for the most hazardous environment in mining.

Here is the decoded meaning of FBCDZ-12-No35:

The Code Decoder (FBCDZ-12-No35)

• F : Fan (General classification)
• B : Blast-proof / Explosion-proof (防爆 - Fang Bao). This means the motor and all components are designed so that electrical sparks or internal overheating cannot ignite methane or coal dust in the mine.
• C : Counter-rotating (对旋 - Dui Xuan). This is the most critical feature. The fan has two impellers (rotors) mounted on the same axis but rotating in opposite directions. This design:
  • Eliminates the need for stationary guide vanes.
  • Provides very high pressure and efficiency.
  • Is more compact than a traditional axial fan of the same power.
• DZ : Dual-support / Base-mounted (底座的 - Di Zuo De). The fan is not a simple duct; it has a structural base and often features two separate motors (one for each impeller).
• 12 : Sequence number or Motor Power Indicator. In the FBCDZ series, this often corresponds to the specific motor pole or a specific power/frame size configuration. (Often '12' indicates a 6-pole motor, but the specific power output needs the datasheet).
• No35 : Impeller Diameter = 35 dm (Decimeters). This means the diameter of the fan blades is 5 meters (140 inches) .

The Context: "Coal Mine Exhaust Explosion-Proof Counter-Rotating Axial Flow Fan"

This clarifies the application:

• Coal Mine Exhaust (Main Ventilation): This is not a local air mover. It is a Main Fan (MF) used for the entire mine's ventilation system. It runs 24/7/365 to pull "return air" (stale, potentially gassy air) out of the mine.
• Explosion-Proof: Essential for exhaust duty. The exhaust air can contain methane (CH4) mixed with air. If a fan catches fire or sparks, the entire mine could explode. This fan is certified to operate safely in explosive methane atmospheres.

Key Performance Characteristics (Inferred from the Model)

While exact curves require a manufacturer's data sheet (e.g., from Shandong Fengtai, Wenling, or Shenyang Fan Factory), the No35 size dictates the general power and flow class:

• Application: Large, underground coal mines (typically producing 3-5 million tons/year or more).
• Air Volume (Flow Rate): Likely in the range of 150 - 350 m³/s (318,000 - 740,000 CFM).
• Static Pressure: Typically 2,000 - 5,000 Pa (8 - 20 inches w.g.), depending on mine depth and resistance.
• Motor Power: For a No35 fan, the installed power per motor is typically massive.
  • Example: Two motors of 800 kW (1,072 HP) each, totaling 1,600 kW (2,144 HP) .
  • Or possibly 1,000 kW (1,340 HP) per motor (2,000 kW total) .
• Speed: Usually around 740 RPM to 990 RPM (6-pole or 8-pole motors controlled by a frequency drive).

Critical Differences from Standard Fans

Summary

The FBCDZ-12-No35 is a massive, explosion-proof main mine ventilation fan.

• Size: 3.5-meter diameter impellers.
• Action: It sucks air out of the entire mine.
• Technology: Counter-rotating axial flow for high pressure and efficiency.
• Safety: Certified to operate with explosive methane gas.
• Power: Likely a 6 MW to 2.0 MW unit (critical infrastructure that costs hundreds of thousands of dollars).

If you are buying or maintaining this, you need to specify the motor voltage (6kV / 10kV) , the blade angle requirement, and the required ATEX/IECEx certification level.