FBCDZ Series Explosion-Proof Extractive Counter-Rotating Axial Flow Main Ventilation Fan
01 / Engineering Overview
Counter-Rotating Main Ventilation for Large and Medium Coal Mines
FBCDZ series, formerly known as BDK62 series, is used for main ventilation systems in large and medium-sized coal mines. It is intended for mine ventilation networks requiring large airflow, higher pressure adaptability and continuous long-term operation.
The fan uses two axial impellers rotating in opposite directions. This aerodynamic arrangement is the main structural difference from single-stage FBCZ fans and allows the series to cover higher-capacity coal mine ventilation duties.
01 / LARGE AIRFLOW
Main Network Capacity
Representative models cover mine airflow requirements from tens to several hundred cubic metres per second.
02 / PRESSURE
Higher Resistance Adaptability
The counter-rotating structure is used where mine ventilation-network resistance requires stronger pressure capability.
03 / CONTINUOUS DUTY
Long-Term Main Ventilation
The series is intended for continuous mine main ventilation rather than temporary or local working-face ventilation.
02 / Counter-Rotating Design
Two Impellers Rotate in Opposite Directions
Instead of a single working wheel followed by a conventional guide-vane arrangement, FBCDZ uses two working stages rotating in opposite directions. The second impeller acts on the airflow leaving the first stage and supports higher pressure capability for demanding mine networks.
STAGE 01
First Impeller
The first-stage impeller accelerates and pressurizes the mine ventilation airflow.
STAGE 02
Counter-Rotating Impeller
The second impeller rotates in the opposite direction and further develops the airflow pressure.
EFFICIENCY
Reduced Intermediate Losses
The counter-rotating arrangement reduces the need for intermediate guide vanes and helps reduce associated aerodynamic losses.
RESULT
Higher Network Capability
The two-stage structure allows the series to cover larger and higher-resistance mine ventilation duties.
03 / Core Structural Features
Structural Features for Coal Mine Main Ventilation
Two-Stage Counter-Rotating Impellers
Two impellers rotate in opposite directions to support pressure development and high-efficiency mine ventilation operation.
Direct Motor-Impeller Connection
Direct connection avoids an additional transmission device and reduces transmission-related mechanical complexity and energy loss.
Pressure-Resistant Motor Cover
The motor is installed inside a sealed pressure-resistant cover positioned in the main airflow passage.
Adjustable Blade Angle
Blade installation angle can be adjusted according to production stages and mine ventilation demand.
Reverse Airflow
Reverse rotation provides approximately 60% of normal airflow according to the current product reference.
Stable Performance Curve
The series is designed for stable operation under changing mine ventilation-network resistance conditions.
04 / Motor Isolation
Sealed Motor Cover and Positive-Pressure Protection
The FBCDZ motor is positioned inside a sealed cover in the main air duct. The cover is designed to resist pressure and helps isolate the motor from gas-containing airflow passing through the fan.
Sealed Motor Chamber
The motor is enclosed inside a dedicated pressure-resistant cover rather than being directly exposed to the main ventilation airflow.
Outside Fresh-Air Connection
Streamlined air ducts connect the sealed motor cover with outside fresh air.
Positive Pressure
Fresh-air supply helps maintain positive pressure inside the motor cover during operation.
Motor Cooling
The outside-air connection also supports motor cooling during continuous mine ventilation operation.
05 / Representative Performance
FBCDZ Representative Model Parameters
The following models show the operating range of the FBCDZ series for preliminary comparison. Final fan selection should be confirmed from required airflow, pressure, mine ventilation-network resistance, motor configuration and fan-station layout.
SERIES
FBCDZ / formerly BDK62
STATIC EFFICIENCY
Up to 86%+
REVERSE AIRFLOW
Approx. 60%
SERIES
NO.
POWER
AIRFLOW
PRESSURE
SPEED
FBCDZ(B)-4
No.11
2×45 kW
17–33 m³/s
830–2670 Pa
1480
FBCDZ(B)-4
No.14
2×110 kW
32–59 m³/s
1300–4400 Pa
1480
FBCDZ(A)-6
No.16
2×55 kW
23–53 m³/s
450–1970 Pa
980
FBCDZ(A)-6
No.19
2×110 kW
41–91 m³/s
600–2780 Pa
980
FBCDZ(B)-6
No.20
2×220 kW
55–119 m³/s
1170–4100 Pa
980
FBCDZ(B)-6
No.22
2×355 kW
72–160 m³/s
1400–4900 Pa
980
FBCDZ(B)-8
No.18
2×75 kW
31–67 m³/s
520–1900 Pa
740
FBCDZ(B)-8
No.24
2×250 kW
72–155 m³/s
1000–3400 Pa
740
FBCDZ(B)-12
No.38
2×800 kW
190–413 m³/s
1100–3800 Pa
480
Reference only: the listed operating ranges are for preliminary comparison. Final model, blade angle, motor configuration and operating point should be confirmed from the actual mine ventilation-network requirement.
06 / Performance Guide
How to Read FBCDZ Model Data
01
Series
Identifies the FBCDZ configuration family and speed direction.
02
Machine Number
Shows the machine-size direction within the selected series.
03
Installed Power
Two motor ratings are shown because the fan uses two counter-rotating stages.
04
Airflow
Compare the model range against the required mine main ventilation airflow.
05
Pressure
The fan pressure range should match mine ventilation-network resistance at the required airflow.
06
Speed
The listed 1480 / 980 / 740 / 480 r/min values correspond to different machine-size and series directions.
07 / Selection Logic
Information Required for FBCDZ Main Fan Selection
Selection should start from the actual mine ventilation network rather than from machine number or motor power alone.
01
Required Airflow
Provide the required mine main ventilation airflow.
02
Static / Total Pressure
State the pressure basis and required operating pressure.
03
Network Resistance
Provide the mine ventilation-network resistance or resistance curve when available.
04
Gas & Safety Condition
Provide the mine gas condition and project safety requirements.
05
Reverse Airflow
State whether reverse ventilation is required and the expected reverse operating condition.
06
Motor / Voltage
Provide voltage, frequency and electrical-system requirements.
07
Fan Station Layout
Provide foundation, connection direction, available space and station layout.
08
Blade Adjustment
Provide expected operating stages when blade-angle adjustment has to cover changing mine conditions.
08 / Typical Applications
Large Coal Mine Main Ventilation Applications
01 / MAIN FAN
Coal Mine Main Ventilation
Primary extractive ventilation for large and medium-sized coal mine ventilation networks.
02 / SURFACE STATION
Large Mine Surface Fan Station
Used in mine surface ventilation stations where large airflow and long-term continuous operation are required.
03 / HIGH RESISTANCE
High-Resistance Mine Network
Counter-rotating performance provides a selection direction for mine networks with higher system resistance.
04 / REVERSAL
Mine Reverse Airflow System
Reverse rotation can be used where the mine ventilation plan requires a reverse airflow function.
09 / Product Boundary
FBCDZ Counter-Rotating Main Fan vs. FBCZ Single-Stage Main Fan
ITEM
FBCDZ
FBCZ
Fan Structure
Two-stage counter-rotating axial
Single-stage axial
Mine Direction
Large and medium-sized coal mines
Small and medium-sized coal mines
Pressure Direction
Higher-resistance ventilation networks
Standard single-stage main ventilation duty
Reverse Airflow
Approx. 60% of normal airflow
Approx. 65%–85% of normal airflow
10 / FAQ
FBCDZ Mine Main Ventilation Fan Questions
What is FBCDZ mainly used for?
FBCDZ is used as an explosion-proof extractive main ventilation fan for large and medium-sized coal mine ventilation systems.
Why does FBCDZ use two counter-rotating impellers?
The second impeller rotates opposite to the first and helps develop additional pressure while reducing the need for an intermediate guide-vane stage.
How is FBCDZ different from FBCZ?
FBCDZ uses two counter-rotating stages and is intended for larger or higher-resistance mine ventilation networks. FBCZ uses a single-stage axial impeller.
What is the reference static pressure efficiency?
The supplied product information states static pressure efficiency up to 86%+ under suitable operating conditions.
Can FBCDZ reverse airflow?
Yes. Reverse rotation can provide approximately 60% of the normal airflow according to the current reference.
Can blade angle be adjusted?
Yes. Blade installation angle can be adjusted according to mine production and ventilation demand.
What is the largest representative model shown on this page?
The largest listed representative model is FBCDZ(B)-12 No.38 with 2×800 kW installed power, 190–413 m³/s airflow and 1100–3800 Pa pressure.
What information is required for selection?
Provide required airflow, pressure, mine ventilation-network resistance, gas condition, reverse-airflow requirement, motor and voltage requirements, fan-station layout and blade-angle adjustment requirements.
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