9-19-11.2D High-Pressure Centrifugal Fan

This article's table of contents introduction:

1. Decoding the Fan Model Number: 9-19-11.2D
2. Key Characteristics of a 9-19 Series Fan
3. Typical Applications
4. Critical Performance Parameters (Need to Specify)
5. Summary Table

The designation 9-19-11.2D High-Pressure Centrifugal Fan refers to a specific type of industrial fan used for moving air or gases against high static pressure. Here is a detailed breakdown of what that designation means and the fan's characteristics.

Decoding the Fan Model Number: 9-19-11.2D

This number follows a specific Chinese fan naming convention (often used for fans like the 9-19 or 9-26 series).

1. 9: This indicates the pressure coefficient. A higher number generally means higher pressure. The '9' series is for high pressure.
2. 19: This is the specific speed of the fan. The 9-19 series operates at a lower specific speed, meaning it's optimized for high pressure and relatively lower airflow.
3. 2: This is the impeller diameter.
   • This number is non-dimensionalized.
   • 2 dm or 112 cm is typical. This translates to a 12 meter (1120 mm) diameter impeller. This is a large, industrial-sized fan.
4. D: This indicates the drive arrangement.
   • "D" means the impeller is directly coupled to the motor shaft. The fan impeller is mounted on an extended motor shaft or a separate shaft supported by bearings, with a flexible coupling connecting it to the motor. This is stable for high-speed, high-power applications.

Key Characteristics of a 9-19 Series Fan

• High Static Pressure: The defining feature. It can generate very high static pressure (often exceeding 3000 Pa or 12 inches of water gauge), making it suitable for overcoming resistance in ducts, pneumatic conveying systems, or forced draft applications.
• Low to Medium Airflow: Compared to axial fans or other centrifugal types, the 9-19 series moves a relatively lower volume of air for its impeller size. For an 11.2D model, airflow would be in the range of roughly 20,000 to 60,000 m³/h depending on the specific speed and motor power.
• Forward-Curved or Backward-Curved Blades: The 9-19 series typically uses forward-curved blades, which are well-suited for high-pressure, low-volume applications.
• Rugged Construction: Built for continuous industrial use, typically from heavy-gauge steel.

Typical Applications

Given its high-pressure, moderate-flow profile, the 9-19-11.2D fan is commonly used in:

• Boiler Forced Draft (FD) and Induced Draft (ID) Systems: Supplying combustion air or exhausting flue gases.
• Pneumatic Conveying: Moving materials like cement, grain, sawdust, or plastic pellets through pipes.
• High-Pressure Process Air: Air supply for combustion, drying, or blowing.
• Mine Ventilation: For main or auxiliary ventilation in underground mines.
• Dust Collection Systems: Where high static pressure is needed to overcome filter resistance.
• Kiln and Furnace Air Supply.

Critical Performance Parameters (Need to Specify)

To get a precise performance curve or order the correct motor, you need to specify at least:

• Required Airflow (m³/h or CFM)
• Required Static Pressure (Pa or in.w.g.)
• Air Density / Temperature (affects motor power calculation)
• Atmospheric Pressure (for altitude correction)

The fan manufacturer will use these to select the correct motor power (e.g., 75 kW, 110 kW, 160 kW) and operating speed (RPM) . For an 11.2D impeller, the speed will likely be around 1450 RPM (for a 4-pole motor) or 960 RPM (for a 6-pole motor) depending on the desired pressure.

Summary Table

Important Note: Always consult the manufacturer's selection software or a technical data sheet for the specific performance curve and motor requirements for your exact operating conditions. A 9-19-11.2D fan is a significant piece of rotating equipment requiring professional installation, balancing, and safety guards.