• 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/GY Series High-Pressure Centrifugal Blowers are specialized induced draft fans tailored for 1-10t/h industrial boilers. These industrial centrifugal fans are also suitable for other settings requiring similar dry air intake conditions and performance. The centrifugal fan conveys air with temperatures not exceeding 80°C, while the induced draft centrifugal blower handles flue gases up to 250°C. Installing a dust removal device before the high-pressure centrifugal fan is essential to minimize dust content in the flue gas entering the fan, ensuring a dust removal efficiency of at least 85%.

Key features include matching flow rate and pressure to boiler requirements and maintaining noise levels generally below 85dB(A) at the design point. An optional new-type silencer can be equipped. The industrial centrifugal fan's flat performance curve aids in the elimination of smoke and dust from the boiler, enhancing environmental protection. Energy-saving electromagnetic speed-regulating motors and dual-speed motors can adapt to changes in boiler operating loads, providing significant energy-saving effects.

Form

1. 1. Both the centrifugal fan and the induced draft centrifugal blower are designed as single-suction types.

2. 2. Each fan is available in left-hand or right-hand rotation. Viewing the impeller from the motor end, a clockwise rotation indicates a right-hand centrifugal fan ("right"), while a counterclockwise rotation indicates a left-hand centrifugal fan ("left").

3. 3. The outlet position of the centrifugal fan is determined by the casing's outlet angle and can be configured in various directions such as 0°, 45°, 90°, 135°, 180°, 225°, etc.

4. 4. The fan drive modes include:

   • Type D: Motor and centrifugal fan connected by an elastic coupling for direct drive.
   • Type A: Motor and fan directly connected.
   • Type C: Motor and fan driven by a V-belt.

Structural Characteristics

The industrial centrifugal fan comprises an impeller, casing, air inlet, adjustment door, transmission part (Types C and D), and a bracket. The adjustment door is optional and must be specified when ordering.

1.  
2. 1. Impeller: The blades are made of steel plates welded between an arc-conical front disc and a flat rear disc. The optimized design ensures high efficiency, low noise, and strong structural integrity. The impeller undergoes dynamic and static balance calibration for smooth operation.
3. 2. Casing: Constructed as a volute-shaped body welded from standard steel plates.
4. 3. Air Inlet: Features a convergent streamlined structure fixed to the fan inlet side with bolts. Flexible connection devices are available for both the casing outlet and the fan inlet to reduce vibration.
5. 4. Adjustment Door: Used to regulate the fan flow rate, installed axially in front of the centrifugal fan. It consists of petal-shaped blades with an adjustment range from 90° (fully closed) to 0° (fully open). The lever position is on the right side when viewed from the air inlet. For a right-hand centrifugal fan, pushing the lever from bottom to top moves from fully closed to fully open; for a left-hand fan, pulling the lever from top to bottom achieves the same.
6. Proper lubrication is crucial for the adjustment door's components. For the centrifugal fan's adjustment door, calcium-sodium-based grease is used; for the induced draft centrifugal blower operating at higher temperatures, molybdenum disulfide high-temperature grease (up to 260°C) ensures lubrication during high-temperature operation. This is unnecessary when using variable speed or dual-speed motors.
7. 5. Transmission Part: The main shaft of Types C and D transmissions is made from high-quality steel. Both the centrifugal fan and the induced draft centrifugal blower use rolling bearings housed in an integral cylindrical bearing box equipped with a thermometer and oil level indicator. Lubrication is provided by full-loss system oil L-AN46, added according to the oil level mark. The induced draft centrifugal fan includes a water cooling device requiring water pipe installation, with consumption varying with temperature (generally 0.5~1m³/h). In colder regions, water use may not be necessary depending on specific conditions.

Performance and Selection

The performance of the industrial centrifugal fan is characterized by parameters such as flow rate, total pressure, spindle speed, internal power, and efficiency. The provided performance data is based on air at t=20°C, atmospheric pressure pₐ=101325Pa, and gas density ρ₀=1.2kg/m³. The air intake state of the induced draft centrifugal blower is shown in the performance table, referring to conditions when the adjustment blade is at 0° (fully open). For ordering, the performance table should be referenced, and if usage conditions differ, performance should be converted using relevant formulas. The selected motor power should not be lower than the required power value.

Factory inspection ensures that at the design flow rate, the total pressure deviation does not exceed ±5% of the design value. Variations in flow rate during use can result from changes in pipe network resistance or blockage. If the centrifugal fan is newly installed and exhibits excessive or insufficient flow during operation, possible causes include discrepancies between actual and calculated pipe network resistance or unaccounted total pressure deviations.

To address flow issues:

1. 1. Adjust Fan Speed: Use dual-speed motors or speed-regulating motors to adjust the centrifugal fan's speed and flow rate.

2. 2. Modify Adjustment Door: Adjust the flow rate using the adjustment door's opening degree.

3. 3. Replace Fan: Substitute with a new centrifugal fan of higher or lower pressure to modify the flow rate.

4. 4. Alter Pipe Network: Change the pipe network to adjust the resistance coefficient and flow rate.

If the flow remains insufficient with the adjustment door fully open, consider reducing the pipe network's resistance coefficient or increasing the fan speed. However, the speed must not exceed the maximum specified in the performance table.