This article's table of contents introduction:
- Key Technical Specifications to Define
- Recommended Fan Type
- Voltage Selection
- Example Selection (Representative)
- Potential Suppliers (Global & Chinese)
- Efficiency & Energy Saving Tips
- Next Steps for Quotation
It looks like you are looking for a high-efficiency Forced Draft (FD) fan for a boiler application, with specific parameters:
- Flow Rate: Less than 900,000 m³/h (likely around 600,000–800,000 m³/h for a high-efficiency unit)
- Voltage Options: 440V or 10kV
- Application: Boiler FD fan (typically for power plants or industrial steam boilers)
Here is a structured guide to help you select or specify such a fan.
Key Technical Specifications to Define
| Parameter | Typical Range for Your Case |
|---|---|
| Flow Rate (Q) | 600,000 – 850,000 m³/h |
| Total Pressure (ΔP) | 3,000 – 8,000 Pa (depending on boiler resistance) |
| Efficiency | ≥ 85% (modern high-efficiency designs > 90%) |
| Speed | 750 – 1,500 RPM (adjustable via VFD or fixed) |
| Power | 500 – 1,500 kW |
| Voltage | 440V (≤ 500 kW) or 10kV (> 500 kW) |
| Impeller Type | Backward-curved / airfoil blades (high efficiency) |
Important: High-efficiency FD fans typically use backward-curved centrifugal or axial designs with airfoil blades.
Recommended Fan Type
For this flow range and pressure:
Centrifugal Fan with Backward-Curved / Airfoil Blades
- Efficiency: 85–92%
- Pros: Stable operation, high static pressure, low noise
- Typical for: Coal/biomass/gas boilers in power plants
Axial Fan (Variable Pitch)
- Pros: Very compact, high flow, good for low-medium pressure
- Less common for high-pressure boiler FD
Suggested: High-efficiency centrifugal FD fan with inlet guide vanes (IGV) and variable frequency drive (VFD) for turndown.
Voltage Selection
| Voltage | Use Case | Motor Type |
|---|---|---|
| 440V | Lower power (< 600 kW) | LV squirrel cage induction motor |
| 10 kV | Higher power (> 600 kW) | MV induction or synchronous motor |
For your range (likely 800–1,500 kW), 10 kV is strongly recommended to reduce cable size, losses, and motor current.
Example Selection (Representative)
| Parameter | Value |
|---|---|
| Flow | 800,000 m³/h |
| Pressure | 5,000 Pa |
| Efficiency | 91% |
| Speed | 990 RPM |
| Power | ~1,200 kW |
| Motor | 10 kV / 1,300 kW |
| Control | VFD + IGV |
| Impeller | Backward-curved airfoil (stainless steel or high-strength steel) |
Potential Suppliers (Global & Chinese)
| Supplier | Known For |
|---|---|
| Howden | High-efficiency FD fans for utility boilers |
| TLT-Turbo (Siemens) | Axial and centrifugal boiler fans |
| ABB / FLSmidth | Full systems with motors |
| Shanghai Blower Works / Shenyang Blower | Cost-effective Chinese options |
| Zhejiang Shangfeng | Specialized in power plant fans |
| Greenheck / New York Blower | Smaller industrial boilers |
Efficiency & Energy Saving Tips
- Use VFD instead of dampers → saves 20–35% energy at partial load
- Airfoil impeller reduces drag → +3–5% efficiency over flat blades
- Inlet guide vanes improve turndown efficiency
- Coat impeller for erosion resistance if coal/ash laden
Next Steps for Quotation
To get a precise selection, you need to provide:
- Exact flow and pressure requirement (point or range)
- Gas temperature (ambient or preheated)
- Altitude / air density
- Duct connection details (inlet/outlet size)
- Material requirement (carbon steel, stainless, wear-resistant)
Would you like me to help you calculate the required motor power, or draft a technical specification sheet for a tender/quotation?
