• Durability: Vinylester resin, UV protection, extended service life.
• Customizable: Computer strain analysis, G2.5 balance, low vibration risk.
• Easy Maintenance: Oil bath bearings, heat/corrosion resistant, cost-effective.
• Professional Team: Expert wind turbine guidance.
• High aerodynamic efficiency, low noise, corrosion resistance.
• Medium temp range: -20℃ to 80℃, ≤ humidity, ≤ 100mg/m3 dust content.
• Durable Fiberglass Build: Ensures long-lasting performance.
• Ethylene-based fiberglass blades optimize airflow.

Application

The GG and GY series centrifugal induced draft fans are purpose-built for industrial boilers with capacities from 1 to 75t/h. These centrifugal fans are specifically designed to fulfill the requirements of different boiler specifications, meeting national standards for environmental protection and minimizing pollution. Models in the GY series include GY2-13No.8.8D, GY4-13No.9D, GY6-13No.9.8D, GY8-13No.10D, GY10-13No.10D, GY15-13No.12D, GY20-13No.12.4D, GY20-13No.12.5D, GY40-13No.14D, and GY75-13No.20D. The GG series includes GG2-13No.4A, GG4-13No.4.5A, GG6-13No.5A, GG8-13No.8D, GG10-13No.8D, GG15-13No.9D, GG20-13No.10D, GG20-14No.10D, GG40-13No.11D, and GG75-13No.16D. These centrifugal fans offer efficient control of airflow and ensure consistent performance for industrial boiler applications.
 

Structural Characteristics

These centrifugal blowers feature high operational efficiency, minimal noise, a flat performance curve, and a broad high-efficiency working range. Each centrifugal fan in this series is designed as a single-suction structure and uses either D-type or A-type transmissions, providing a compact design for easy transportation, installation, and operation. The fans are available in left-hand and right-hand rotations, with outlet directions that can be customized to 0°, 45°, 90°, 135°, 180°, 225°, or 270°, depending on user requirements. The structure of the fan consists of an impeller, casing, air inlet, adjustment door, and transmission part.

1.  
2. 1. Impeller: The impeller of the induced draft fan is constructed with Q345 (16Mn) steel plates and a conical arc wheel cover, featuring 12 to 28 blades to provide ideal aerodynamic performance. This construction allows the centrifugal fan to achieve high efficiency as a high-pressure centrifugal blower. The impeller is calibrated for both static and dynamic balance and undergoes an overspeed test to ensure stable and smooth operation.
3. 2. Casing: The casing is made of welded ordinary steel plates, forming an integral volute-shaped structure for durability and robustness.
4. 3. Air Inlet: The air inlet of the centrifugal blower is constructed as a streamlined convergent structure, which is bolted securely to the side plate of the casing or the cover flange, with the bolt connection part sealed using asbestos rope to prevent leaks.
5. 4. Adjustment Door: This series of centrifugal fans comes with an adjustable air door that helps regulate the airflow, allowing the centrifugal blower to operate efficiently in different environments. The adjustment door can be easily adjusted from fully open to fully closed, allowing for precise control of airflow direction and volume.
6. 5. Transmission Part: The centrifugal fan's transmission part uses a D-type bearing box that is lubricated with L-AN46 full-loss system oil, with the lubrication level indicated by an oil mark. Fans leave the factory without oil, and molybdenum disulfide high-temperature lubricant is added when the centrifugal fan is installed and put into operation. The lubricant must be replaced every 3 to 5 months. For applications where exhaust temperatures exceed 180°C, a water-cooled bearing box may be used to maintain reliable operation and prolong the life of the fan.

Performance and Selection

The performance of the centrifugal blower is determined by parameters such as airflow, total pressure, shaft speed, power, and efficiency. The GY series induced draft fans are designed to operate at a flue gas temperature of 180℃, with an atmospheric pressure of 101325 Pa and flue gas density of 0.78 kg/m³. The GG series centrifugal fans are designed based on gas temperature at 20℃, atmospheric pressure of 101325 Pa, and flue gas density of 1.2 kg/m³. The performance values in the table correspond to design conditions, and these should be used as the basis for selecting the appropriate fan. If operating conditions differ from these design values, performance adjustments should be made using the appropriate formulas.

During operation, the flow rate of the centrifugal fan may be either too large or insufficient. Such issues are often caused by resistance variations in the pipe network. Gradual decreases in flow rate over time are often due to blockages in the fan or pipe network, while inconsistencies in flow rates are often linked to pipe resistance changes. These issues can often be addressed by adjusting the regulating door, increasing the fan speed (checking motor overload and impeller strength), or modifying the pipe network configuration.