What do induced draft fans do in a boiler system?

Induced draft fans play a crucial role in the operation of a boiler system by creating a negative pressure within the furnace. This negative pressure helps to draw flue gases out of the combustion chamber and into the stack or chimney. By removing these gases effectively, the induced draft fans ensure that the combustion process operates efficiently, maintaining proper airflow and preventing the buildup of harmful gases within the boiler.

The proper removal of flue gases is essential for optimizing combustion efficiency and reducing emissions, thus playing an integral part in meeting environmental regulations. Without induced draft fans, the combustion process would be compromised, potentially leading to incomplete combustion, increased emissions, and even safety hazards due to the accumulation of gases.

While increasing air supply for combustion is important, it is primarily the role of forced draft fans, not induced draft fans. Circulating water through the feedwater system pertains to different components of the boiler system, such as feed pumps. Regulating water pressure is also a function associated with different systems within the boiler, not the function of induced draft fans. Therefore, the primary responsibility of induced draft fans is focused on the effective removal of flue gases from the furnace.