ID Fan Working Principle
An ID fan, or induced draft fan, is a type of mechanical equipment used in industrial processes to remove exhaust gases from a furnace, boiler, or other combustion systems. Its primary function is to create a negative pressure (or draft) within the combustion chamber or stack, which helps to expel the flue gases produced during the combustion process.
In summary, the ID fan’s working principle revolves around creating a negative pressure to facilitate the expulsion of exhaust gases from industrial processes. This helps maintain efficient combustion and environmental compliance in various manufacturing and energy generation applications.
Fan Working Principle
Here’s how an ID fan typically works:
Placement: The ID fan is usually positioned at the outlet of the furnace or boiler system. It draws hot flue gases (and sometimes ambient air mixed with the flue gases) from the combustion chamber or other processing unit.
Impeller Design: The fan consists of an impeller (rotating blades) housed inside a casing. The impeller rotates due to an external power source, such as an electric motor.
Negative Pressure Creation: As the impeller rotates, it draws gases into the casing of the fan. This action creates a negative pressure zone, reducing the pressure inside the combustion chamber or the stack where the gases are emitted. This negative pressure helps to ensure that the flue gases flow out of the system efficiently.
Discharge: Once the gases are drawn into the fan casing, they are discharged through a duct or chimney, often into a pollution control device or directly into the atmosphere, depending on environmental regulations and the specific industrial process.
Control: The operation of the ID fan is often controlled automatically based on the combustion process’s requirements. It may vary its speed or airflow to maintain optimal conditions inside the furnace or boiler, ensuring efficient combustion and emission control.