Induced Draft Fans

An induced draft fan is a general mechanical equipment that generates negative pressure through mechanical power to achieve the directional flow of gases. It falls under the category of gas conveying equipment in fluid machinery. Its core function is to create a negative pressure environment through the rotation of the impeller, guiding the flow of gases (such as flue gas, exhaust gas, air, etc.) in industrial production, HVAC, energy and power systems, etc. It is mainly used to remove dust-laden gases, high-temperature flue gas or harmful exhaust gas generated in the process, while maintaining the pressure balance within the system to ensure the stable operation of the production process or ventilation system. It is mainly composed of an impeller, casing, air inlet, regulating door, and transmission part, etc.

Characteristics of the induced draft fan:
– Motor power: 7.5 – 90 Kw
– Specialized fans for fertilizer manufacturing equipment can be provided.
– In terms of performance, it features large air volume, low wind pressure, high efficiency and energy saving.
– In terms of structure, it has a large impeller diameter and a sturdy casing.
– In terms of material, it can be made of ordinary or special materials.
– In terms of operation, it is highly adjustable, operates smoothly and is easy to maintain.
– It is suitable for various materials and stainless steel can be chosen.
The Application of Induced Draft Fans

As a mechanical device that uses mechanical energy to increase gas pressure and discharge gas, induced draft fans, with their powerful suction capacity, have extensive and significant applications in many fields.

1. In the industrial production sector, the role of induced draft fans is particularly crucial. Many industrial furnaces, such as steelmaking converters, steel rolling heating furnaces, and ceramic kilns, generate large amounts of high-temperature flue gas and harmful gases during operation. Induced draft fans can promptly extract these gases from the furnaces. On one hand, this ensures stable internal pressure within the furnaces, creating favorable conditions for the complete combustion of fuel and improving energy utilization. On the other hand, it also prevents the accumulation of flue gas within the furnaces, which could affect product quality and production safety. Additionally, in chemical production, some reaction vessels release various gases, and induced draft fans can transport these gases to subsequent treatment equipment, ensuring a safe and environmentally friendly production environment.

Benefits: Efficient energy utilization, safety, and environmental protection.

2. The energy and power industry is also a significant application area for induced draft fans. In thermal power plants, the combustion in boilers generates a large amount of flue gas, which induced draft fans are responsible for extracting from the boiler tail and discharging through chimneys into the atmosphere. They not only need to overcome the flow resistance of flue gas in the boiler flue, dust collectors, desulfurization towers, and other equipment but also ensure stable combustion conditions within the boiler, making them indispensable in thermal power systems. In waste incineration power plants, induced draft fans also play a role in extracting the flue gas produced by incineration and sending it to subsequent purification equipment for treatment before emission.

Benefits: Large air volume, durability.

3. In building ventilation, induced draft fans are often used in underground garages, basements, and other places. These areas have poor air circulation and can accumulate vehicle exhaust and damp air. Induced draft fans can extract the stale air and allow fresh air to enter, improving indoor air quality and safeguarding people’s health. In some large shopping malls, stadiums, and other public buildings, when natural ventilation is insufficient, induced draft fans are also used as part of the mechanical ventilation system.

Benefits: Assisting in regulating the indoor air environment.

4. The environmental protection treatment field also relies on the support of induced draft fans. In sewage treatment plants, the treatment process generates malodorous gases, which induced draft fans can extract and send to odor removal equipment for treatment, preventing pollution to the surrounding environment. In exhaust gas treatment systems, induced draft fans can draw various industrial exhaust gases into purification devices, where they undergo filtration, adsorption, combustion, and other treatments to meet emission standards before being released, effectively reducing air pollution.

Benefits: Strong environmental adaptability.

5. In addition, in grain storage, induced draft fans can be used for ventilation and cooling in grain silos to prevent mold growth. In mining, induced draft fans can help remove harmful gases such as methane from underground mines, ensuring the safety of mining operations.

Benefits: Wide application range.