What is the purpose of prepurging a boiler before ignition?

The purpose of prepurging a boiler before ignition is primarily to remove unburned fuel from the combustion chamber. This step is crucial for ensuring safe and efficient operation of the boiler. By clearing out any residual combustible gases or vapors, prepurging helps prevent the risk of explosion or fire that could occur if these gases were to ignite upon the initial application of the ignition source.

Prepurging typically involves the introduction of air into the combustion chamber to help displace any unburned fuel. This process not only enhances safety but also contributes to the efficiency of the combustion process once the boiler is ignited, promoting a cleaner burn and reducing emissions.

While heating the boiler, checking the fuel supply, and adjusting pressure levels are important areas of boiler operation and management, they do not specifically relate to the initiation of combustion or the removal of potentially hazardous gases, which is the primary focus of prepurging.