What is the function of a flame scanner in fired heater operations?

The function of a flame scanner in fired heater operations is primarily to monitor flame presence. Flame scanners are critical safety devices that detect whether a flame is present in the combustion chamber. This monitoring is essential for ensuring that the burner is functioning correctly and that combustion conditions are safe.

If the flame scanner detects that the flame is absent when it should be present, it can trigger safety protocols to shut down fuel flow to prevent dangerous situations such as unburned fuel accumulating. Conversely, if the flame is present, the flame scanner confirms that combustion is occurring as intended. This real-time monitoring helps to maintain operational efficiency and safety in the equipment, as improper flame conditions can lead to inefficient combustion, increased emissions, or even hazardous situations.

This function sets flame scanners apart from the other options provided. The role of flame scanners is distinct from regulating pressure, controlling airflow, or igniting the burner, which are managed by different components and systems within the overall operation of fired heaters.