What is the purpose of the draft system in a boiler?

The purpose of the draft system in a boiler is to control the flow of air to and from the boiler. A well-functioning draft system ensures that the correct amount of air is supplied for combustion and that the flue gases produced during combustion are effectively vented away from the boiler. By regulating this flow, the draft system plays a crucial role in maintaining the efficiency of the combustion process, ensuring that fuel is burned properly, and preventing the accumulation of harmful gases within the system.

A balanced draft system contributes to optimal boiler performance, safety, and the overall efficiency of the heating process. If the air supply is insufficient, it can lead to incomplete combustion and increased emissions. Conversely, too much air can cool the flame and reduce the combustion temperature, impacting efficiency. Thus, the draft system's main function is to manage the airflow necessary for effective combustion and safe operation.