15kW Flue Gas Recirculation Fan

This article's table of contents introduction:

1. What is a 15kW FGR Fan?
2. Typical Technical Specifications (Estimate)
3. Critical Design Features for FGR Fans
4. Common Applications for a 15kW FGR Fan
5. Selection Checklist (If you are buying)
6. Example Manufacturers (Global)
7. Price Estimate (Rough Guide)
8. Important Warning about 15kW FGR Fans

Based on your query “15kW Flue Gas Recirculation Fan,” it appears you are looking for information regarding a fan used in an FGR (Flue Gas Recirculation) system, specifically rated at 15 kW (kilowatts) .

Here is a technical breakdown of what this specification implies, the typical applications, and the key factors you need to consider for selection or procurement.

What is a 15kW FGR Fan?

A 15kW FGR fan is a high-temperature, heavy-duty industrial fan designed to handle corrosive and hot exhaust gases. The "15kW" refers to the motor power output, which dictates the airflow volume and pressure the fan can achieve.

• Typical Power Range: FGR fans usually range from small (2-5kW) to very large (100kW+). A 15kW fan is considered a medium-to-large unit, suitable for industrial boilers or smaller power plants.
• Voltage: Typically 3-phase (380V, 400V, 415V, 460V, or 690V depending on region and VFD compatibility).

Typical Technical Specifications (Estimate)

While exact specs depend on the manufacturer and application (e.g., coal vs. gas boiler), a 15kW FGR fan usually falls within these ranges:

Critical Design Features for FGR Fans

FGR fans handle the worst conditions in a flue gas system. A 15kW unit must be specifically engineered for:

• Heat Resistance:
  • The motor is usually mounted separately with a shaft cooling fan and heat slinger.
  • The shaft seal prevents hot gas from reaching the bearings.
  • Bearings must be rated for high ambient temperatures (often water-cooled or air-cooled pedestal bearings).
• Corrosion & Erosion Resistance:
  • Flue gas contains sulfur oxides (SOx) which form sulfuric acid at low temperatures. The fan must operate above the acid dew point.
  • The impeller is often coated with anti-corrosion paint or made of stainless steel.
• VFD Compatibility:
  • FGR fans almost always run with a Variable Frequency Drive (VFD) to control the recirculation rate. The motor must be inverter-rated (IGBT friendly).
• Leakage Prevention:
  • FGR fans use mechanical seals or labyrinth seals to prevent toxic flue gas from leaking into the atmosphere.

Common Applications for a 15kW FGR Fan

A fan of this size (15kW) is typically found in:

• Industrial Boilers (5 – 15 MW thermal output): Used to reduce NOx emissions by recirculating a portion of the exhaust back into the burner.
• Waste Heat Recovery Systems: Moving hot gases through HRSGs (Heat Recovery Steam Generators).
• Biomass or Coal-Fired Furnaces: Managing excess oxygen and maintaining temperature.
• Process Heaters: In refineries or chemical plants.

Selection Checklist (If you are buying)

If you are looking to purchase or replace a 15kW FGR fan, you need the following data:

1. Gas Temperature (Max & Operating): This determines the material and cooling design.
2. Gas Composition: Is it acidic? High particulate? (Determines SS vs. CS material).
3. Required Flow (m³/hr or CFM): The exact volume at the operating temperature.
4. Static Pressure (Pa or inches w.g.): System resistance including ducts and dampers.
5. Ambient Temperature: For motor and bearing selection.
6. Mounting Configuration: Arrangement (e.g., Arrangement 4 is common - impeller overhung, motor separate).

Example Manufacturers (Global)

Companies that produce industrial-grade FGR fans in the 15kW range:

• New York Blower (USA)
• Greenheck (USA) – Industrial line
• Cincinnati Fan (USA)
• Howden (Global)
• Soler & Palau (Europe)
• Korfmann (Germany)
• AirPro Fan & Blower (USA)
• Asian manufacturers: Zibo, Yilong (China) – often lower cost but check quality.

Price Estimate (Rough Guide)

• Standard Carbon Steel (up to 200°C): $4,000 – $8,000 USD (ex-motor)
• Stainless Steel / High Temp (300°C+): $8,000 – $15,000 USD
• With VFD & Control Panel: Add $2,000 – $5,000

Important Warning about 15kW FGR Fans

Do NOT use a standard centrifugal fan for FGR service.

• Standard fans will fail rapidly due to thermal expansion, corrosion, and stress.
• Always look for a fan explicitly labeled "For Flue Gas Recirculation" or "High Temperature Industrial Fan."

Next Steps:

• If you have a specific application (e.g., a 10-ton boiler, a biomass plant), please provide the gas temperature and duct size.
• If you are troubleshooting an existing fan (e.g., vibration, overheating, low flow), let me know the symptoms.