What are the three types of fans in a boiler?
Time:Dec 29th, 2025
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Primary Air Fan: Delivers primary air for fuel combustion in the boiler. For example, in a pulverized coal boiler, primary air fan is responsible for drying and carrying pulverized coal into the furnace, providing the necessary oxygen for initial combustion. It should be selected with stable air pressure and accurate airflow to ensure uniform fuel delivery into the furnace, laying the foundation for combustion. It is suitable for pulverized coal boilers, biomass boilers, and other boilers that require air-assisted fuel delivery.
Secondary Air Fan: Supplements the boiler furnace with secondary air (combustion air) to provide the necessary air for combustion and promotes complete fuel combustion by organizing the airflow structure. It requires uniform air delivery and adjustable air pressure, allowing for flexible adjustment of the airflow according to the combustion conditions in the furnace to ensure combustion efficiency and reduce energy consumption. It is widely applicable to various industrial and power plant boilers, especially suitable for high-intensity combustion conditions.
Induced Draft Fan: It extracts the flue gas and soot generated by boiler combustion from the furnace and discharges them to the flue or dust removal equipment. It requires a large air volume and has the properties of high temperature resistance and corrosion resistance to maintain a slight negative pressure in the furnace and prevent flue gas from escaping. It is a key piece of equipment in all boiler systems that require flue gas exhaust.
