Plant Operation Practice Test

What is the role of the induced draft fan in a boiler?

1. To supply water to the boiler

2. To facilitate combustion air flow

3. To remove combustion gases

4. To cool the boiler components

The correct answer is: To remove combustion gases

The role of the induced draft fan in a boiler is primarily to remove combustion gases from the boiler system. By creating a negative pressure inside the boiler, the induced draft fan effectively draws exhaust gases out of the combustion chamber and through the flue system. This process helps maintain the necessary airflow for effective combustion and ensures that toxic gases produced during the combustion process are expelled from the system, thereby enhancing the safety and efficiency of the operation. While other components in a boiler system may be responsible for supplying water, facilitating air flow, or cooling components, the induced draft fan's specific function revolves around managing the byproducts of combustion. This crucial role in gas removal helps prevent the buildup of harmful gases, contributing to proper combustion and the overall effectiveness of the boiler.