4th Class Power Engineering 4B7 Practice Exam

Which statement describes the function of the flame safeguard system in a boiler?

Monitors flame and shuts off fuel if flame is lost Sets boiler pressure Adjusts combustion air automatically to meet demand Purges the furnace after shutdown

Correct Answer:

Monitors flame and shuts off fuel if flame is lost

Explanation:

The essential job of the flame safeguard system is to monitor the burner flame and shut off the fuel if the flame is lost. It uses a flame detector to verify there is a flame while fuel is being supplied, and if no flame is detected within a set time, the safety controller closes the fuel valve and may trigger an alarm or interlock to prevent unburned fuel from building up. This safety action protects against fuel leaks and potential explosions when combustion is interrupted. The other functions described belong to different boiler controls: setting boiler pressure is handled by the pressure control system, automatic adjustment of combustion air is done by an air-mandate control, and purge-after-shutdown sequences are part of separate safety/venting routines.

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