New York Low Pressure Boiler COF Practice

What component controls the exhaust flow in a low pressure boiler?

1. Blower

2. Stack

3. Exhaust damper

4. Fan

The correct answer is: Exhaust damper

The component that controls the exhaust flow in a low pressure boiler is the exhaust damper. This device is positioned within the flue or stack system and functions to regulate the amount of flue gases that can exit the boiler. By opening or closing, the exhaust damper can adjust the flow to ensure optimal performance and efficiency, while also assisting in maintaining proper draft conditions within the boiler. Controlling the exhaust flow is crucial for preventing back pressure that could affect combustion processes, thus ensuring safe and efficient operation. Additionally, it plays a significant role in maintaining emissions compliance and improving the overall efficiency of the system. While blowers and fans may aid in moving air or exhaust, they do not directly regulate the flow like the exhaust damper does. The stack serves primarily as a conduit for the exhaust gases to exit the boiler and does not control the flow itself. Therefore, the exhaust damper is essential for managing the exhaust flow effectively.