The boiler forced and induced draft fans are important equipment in the boiler system, primarily used to supply the necessary air for the combustion process of the boiler and to exhaust the waste gases produced by combustion.


The following is a detailed introduction about boiler forced and induced draft fans:

Working Principle

- Centrifugal Fan: Driven by an electric motor, the impeller rotates at high speed, causing air to flow from the center to the edge of the impeller under centrifugal force, thereby generating pressure and flow to achieve air transportation.

- Roots Blower: Utilizes two intermeshing impellers to create periodic volume changes during rotation, transporting air from the inlet to the outlet.

Structural Components

- Impeller: The core component of the fan, whose shape and size directly affect the fan's performance.

- Casing: Typically made of steel plate, it protects the internal components of the fan and guides the airflow.

- Inlet: Used to draw external air into the fan.

- Outlet: Used to deliver the pressurized air from the fan to the boiler.

- Transmission Device: Includes the motor, coupling, pulley, etc., used to transfer the motor's power to the impeller.

- Bearings and Sealing Devices: Used to support the impeller and prevent air leakage.

Performance Characteristics

- High Pressure: Capable of providing sufficient air pressure to overcome resistance during the combustion process.

- Stable Flow: Can provide a stable airflow according to the boiler's needs.

- High Efficiency: Advanced design and manufacturing processes improve the fan's efficiency.

- Stable Operation: Good vibration resistance and reliability, enabling long-term stable operation.

- Low Noise: Noise during fan operation is reduced through optimized impeller design and the use of soundproofing materials.

Selection Method

- Determine the Fan Type: Select the appropriate fan type based on factors such as the boiler type, combustion method, required air volume, and air pressure.

- Determine the Fan Model: Select the appropriate fan model based on the required air volume, air pressure, and fan type.

- Determine the Fan Speed: Select the appropriate fan speed based on the fan model and the required air volume and air pressure.

- Determine the Motor Power: Select the appropriate motor power for the fan based on the fan speed and the required air volume and air pressure.

Maintenance

- Regularly check the fan's operating conditions: including speed, air volume, air pressure, temperature, noise, etc., and address any issues promptly.

- Regularly clean the fan's impeller and casing: Prevent dust and debris accumulation in the impeller and casing, which could affect the fan's performance.

- Regularly replace the fan's lubricating oil and bearings: Prevent aging and damage of lubricating oil and bearings, which could affect the fan's operation.

- Regularly inspect the fan's transmission and sealing devices: Prevent loosening and leakage of transmission and sealing devices, which could affect the fan's performance.