About ID Fan Blower
An Induced Draft (ID) fan blower is a critical centrifugal device that extracts hot flue gases from boilers, furnaces, or industrial processes and discharges them through a stack. By operating under negative pressure at the outlet, it ensures consistent air movement, optimizes combustion efficiency, and handles high-temperature, dust-laden environments.
Key Characteristics and Functions:
- System Pressure: Creates a negative pressure (vacuum) environment to pull gases through the system.
- Placement: Located at the outlet of the boiler/furnace, before the chimney.
- Construction: Designed with heavy-duty materials, often with specialized blade designs to handle wear, high temperatures, and abrasive dust.
- Drive Types: Typically driven by electric motors, frequently using belt drives for flexibility in speed and to reduce vibration transmission from high-temperature exhaust.
- Components: Consists of an impeller, housing (casing), motor, and inlet/outlet dampers for flow control.
- Specifications: Capacities range from 1,000 to over 100,000 CMH (cubic meters per hour) with static pressures between 80-1000 mmWC.
Primary Applications:
- Boilers & Furnaces: Used to remove exhaust gases.
- Pollution Control: Moves air through ESPs (Electrostatic Precipitators) or bag filters.
- Industrial Ventilation: Used in high-temperature or hazardous fume extraction.
ID fans are essential for maintaining stable operating conditions in industries like power generation, cement, and manufacturing.