Which component is crucial for monitoring flame presence in a boiler?

The flame safeguard system is essential for monitoring flame presence in a boiler as it continuously checks for the existence of a flame during operation. This system is designed to ensure safe operation by detecting whether the burner is lit or if flame failure occurs. In the event of a flame failure, the safeguard system initiates a sequence to shut down the boiler or prevent fuel from being supplied to the burner, thereby preventing the risk of explosion or unsafe operation.

Other components, while important for boiler operation, do not specifically serve the critical function of flame monitoring. The gas valve controls the flow of fuel to the burner but does not monitor flame presence. The combustion chamber is where the fuel is burned, but it does not provide feedback regarding whether combustion is occurring safely. The feedwater pump is responsible for supplying water to the boiler but has no role in flame detection. Thus, the flame safeguard system is vital for ensuring safety through reliable flame monitoring in boiler operation.