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The primary air fan is one of the three main types of fans in a coal-fired power plant boiler, forming the core power equipment of the boiler flue gas system together with the forced draft fan (secondary air fan) and induced draft fan. Its main task is to provide sufficient high-pressure primary air to the boiler combustion system, undertaking key functions such as fuel delivery, drying, sealing, and combustion support.
The primary air fan outlet air is divided into hot and cold paths: hot primary air is heated by an air preheater and then sent to the pulverizing system for drying and carrying pulverized coal; cold primary air is used to regulate the temperature of the air-coal mixture. After mixing, both types of air together transport the pulverized coal to the furnace and provide oxygen for the initial combustion stage. In circulating fluidized bed boilers, the primary air also needs to be divided into multiple paths to achieve functions such as bed fluidization, coal feeding, and sealing.
As of 2026, primary air fans mostly adopt a centrifugal design, featuring high pressure head, large flow rate, and high stability, and are widely used in thermal power generation, industrial boilers, and incineration systems.
Working Principle
Centrifugal primary air fans mainly consist of an impeller, a volute casing, a main shaft, bearing housings, and a coupling. When the motor drives the impeller to rotate at high speed through the coupling, the air between the blades is thrown towards the outer edge of the impeller under centrifugal force, increasing its kinetic and pressure energy. After the gas enters the volute casing, the flow velocity decreases as the flow cross-section gradually expands, and some of the kinetic energy is further converted into static pressure energy. The air at the center of the impeller is discharged, creating a certain degree of vacuum. Air outside the intake port is continuously drawn in under atmospheric pressure—as the impeller continues to rotate, air is continuously drawn in and expelled, achieving continuous gas delivery.
Core Functions
Pulverized Coal Heating and Drying: Hot primary air (approximately 300-350℃), heated by the air preheater, is sent to the pulverizing system for preliminary heating and drying of the pulverized coal, reducing its moisture content and improving combustion efficiency.
Pulverizing System Sealing: In some boilers, sealing air is directly drawn from the primary air header and introduced into equipment such as the coal feeder, effectively preventing pulverized coal leakage.
Initial Fuel Combustion Support: After thorough mixing of pulverized coal and primary air in the burner, the mixture is sent to the furnace, providing the necessary oxygen for ignition and initial combustion.
Product Parameters
The following data represents partial performance specifications. If you require specific parameters not listed, please contact us for customized design service.
Series no.
6-06 series
Feature selection
Performance
Impeller diameter
400-2800mm
Rotation speed
≤3000rpm
Pressure range
1706-8265Pa
Flow range
2752-498507㎥/h
Structure
Blade type
Backward, Straight, Aerofoil type
Impeller support
SWSI, DWDI, Overhung type
Lubrication method
Oil bath, grease, lubrication oil station
Cooling method
Air cooling, Water cooling, Oil cooling
Driven mode
Direct driven, Coupling driven, Belt driven
Installation & Manufacturing
Our manufacturing facility operates more than 300 sets of processing and testing equipment with an annual production capacity of 10,000 units. We maintain strict quality control throughout production to ensure zero-error manufacturing and can meet emergency delivery requirements to guarantee your project timelines.
Xinxiang SIMO Blower Co., Ltd which was founded in 1955,with a registered capital of RMB50,000,000. mainly designs and manufactures Centrifugal fans and Axial flow fans which are applied to industrial systems, which is the senior member of China General Machinery Industry Association ... Xinxiang SIMO Blower Co., Ltd which was founded in 1955,with a registered capital of RMB50,000,000. mainly designs and manufactures Centrifugal fans and Axial flow fans which are applied to industrial systems, which is the senior member of China General Machinery Industry Association ...
