Induced draft fan (suction fan) for boiler systems

The boiler induced draft fan is the core equipment in the boiler system, mainly used to extract flue gas, maintain negative pressure, ensure combustion safety, and environmentally friendly emissions. Its core functions can be summarized as follows:
1. Extract flue gas and maintain negative pressure in the furnace

The rotation of the impeller creates negative pressure, drawing the flue gas from the combustion chamber out of the furnace, ensuring a stable negative pressure inside the furnace (usually -30 to -50 Pa), preventing high-temperature flue gas from leaking out or cold air from flowing back, and avoiding the risk of explosion.

The negative pressure environment can reduce heat loss and improve combustion efficiency (thermal efficiency can reach 78%~86%).
2. Collaborate with environmental protection equipment to ensure compliance with emission standards

The flue gas must pass through the air preheater, electrostatic precipitator, desulfurization, and denitrification equipment in sequence. The induced draft fan must overcome the resistance of this equipment (for example, the resistance of the dust collector is about 1,500 ~ 3,000Pa ) and force the treated flue gas into the chimney.

Modern induced draft fans need to be equipped with intelligent regulation systems to precisely control the discharge pressure.
3. Optimize combustion efficiency

Negative pressure inhaled air adds oxygen to the combustion, promotes complete combustion of the fuel, and reduces the generation of pollutants such as carbon monoxide.

Discharge high-temperature flue gas in a timely manner to avoid heat accumulation in the furnace and improve heat exchange efficiency.

Typical application scenarios

Industrial boilers: exhaust flue gas generated by coal/gas combustion, combined with desulfurization and denitrification equipment.

Circulating fluidized bed boiler: Coordinated combustion control with primary and secondary air.

Small heating furnace: corrosion-resistant design, suitable for chemical, food, and other industries.

Product Structure

Actual picture

Q: What is the monthly supply capacity?

50-100 units

Q: Do you offer quality assurance?

During the warranty period, if there are any quality issues with the product, please contact us for replacement

Q: Can samples be ordered?

Yes

Q: How is your after-sales service?

Monday-Sunday，7:30-18:00，Long-time online after-sales service is worry-free

Q: How can I keep up with the product progress if I don't go to your company?

After placing an order, we will report the production progress regularly

Q: What information do I need to provide to get an accurate quotation?

The operating conditions for the gas to be delivered include flow rate (m3/h), total pressure (Pa), temperature (℃), gas density (kg/m3), and the altitude of the usage location (m); the material of the fan; the voltage, frequency, protection level, explosion-proof level, and whether the motor is variable frequency or not.

Q: Can your packaging ensure the safety of the product?

We wrap the inlet and outlet of the fan, as well as the motor, with stretch film and then secure the fan in a wooden box, which can fully protect the product during transportation and handling.

Q: How long is the warranty period for the product?

1 year