Boiler induced draft fan

A boiler centrifugal fan is a type of centrifugal fan and an essential component of the boiler system, primarily used to supply airflow to the boiler combustion system, ensuring the boiler operates normally.

The following is a detailed introduction to boiler centrifugal fans:

- Working Principle: The air within the fan blades rotates along with the impeller, generating centrifugal force due to the air's mass. The air flows from the inlet along the blades to the outlet, creating a vacuum at the inlet. Under atmospheric pressure, air enters the fan, gains energy from the impeller, and is continuously discharged from the fan outlet.

- Structural Composition: Generally consists of a motor, impeller, housing,扇形导向装置 (sector guide device), and connecting pipelines. The motor provides power, while the impeller is the key component generating airflow.

- Performance Characteristics

- Advantages: Simple construction, reliable operation, minimal maintenance workload, high wind pressure, and high efficiency at rated load, reaching up to 94%.

- Disadvantages: Lower efficiency at small loads and relatively large size.

- Classification: Based on different characteristics and usage environments, centrifugal fans can be categorized into front-mounted, rear-mounted, and side-mounted centrifugal fans. Front-mounted centrifugal fans are usually installed at the front of the flue and are suitable for applications requiring high air pressure and flow, such as air purification and combustion control. Rear-mounted centrifugal fans are installed at the rear of the flue and are suitable for systems with low resistance, such as gas boilers. Side-mounted centrifugal fans are installed on the side of the boiler and are ideal for spaces with limited room or where exhaust gas or hot air needs to be discharged.

- Application Areas: Mainly used for ventilation and induced draft in boilers, as well as widely applied in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling; cooling and ventilation in air conditioning equipment and household appliances; drying and conveying of grains; inflation and propulsion in wind tunnels and air cushion vehicles.

- Selection and Maintenance

- Selection: Based on factors such as boiler type, capacity, combustion method, and system resistance, choose the appropriate model and specifications of the boiler centrifugal fan to meet the airflow and pressure requirements for boiler combustion.

- Maintenance: Regularly inspect the wear and tear of components like the impeller, bearings, and motor, and replace damaged parts promptly; keep the fan clean to prevent dust and debris from entering the fan and affecting its normal operation; regularly lubricate and maintain the fan to ensure smooth and reliable operation.