Blower and induced draft fan: differences and application analysis

In industrial production and building ventilation systems, blowers and induced draft fans are two common types of fan equipment. Although they are all used for gas transportation, there are significant differences in structure, working principle, and application scenarios. This article will provide a detailed analysis of the differences between blowers and induced draft fans, as well as their respective application characteristics.

1、 Structure and Working Principle

Blower:

Structure: Blowers are usually designed in an axial or centrifugal manner, with high air pressure and volume.

Working principle: By generating centrifugal force or axial thrust through rotating blades, gas is sucked in from the inlet of the fan, then accelerated and discharged to the outlet.

Induced draft fan:

Structure: Centrifugal design is also commonly used for induced draft fans, but their blade angles and volute shapes are different from those of blowers.

Working principle: The induced draft fan generates negative pressure, sucks in gas from the outlet, accelerates it through the impeller, and discharges it to the inlet.

2、 Application scenarios

Blower:

Mainly used in situations that require high air pressure and volume, such as boiler combustion, sewage treatment, chemical production, etc.

In the air conditioning system, the blower is used to send air into the room, achieving air circulation and temperature regulation.

Induced draft fan:

Mainly used in situations where exhaust gas or smoke needs to be removed, such as factory smoke exhaust, tunnel ventilation, kitchen fume exhaust, etc.

In the air conditioning system, the induced draft fan is used to expel polluted indoor air from the outside and maintain fresh indoor air.

3、 Performance characteristics

Blower:

The wind pressure and volume are high, but the efficiency is relatively low.

Smooth operation with low noise.

Induced draft fan:

Moderate wind pressure and volume, high efficiency.

Has strong adaptability to particulate matter and moisture in gases.

In summary, there are significant differences between blowers and induced draft fans in terms of structure, working principle, and application scenarios. When selecting and using, reasonable choices should be made based on actual needs and operating conditions to ensure stable operation and efficient performance of the system.