Question 473Steam Plants - Assistant Engineer

The correct answer is C) explosions in the boiler furnace. The primary function of a flame safeguard system on an automatically fired auxiliary boiler is to prevent explosions in the boiler furnace. The flame safeguard system monitors the burner flame and will automatically shut off the fuel supply if the flame is lost or becomes unstable, preventing the buildup of unburned fuel that could lead to an explosion. This is a critical safety feature to protect the boiler and surrounding equipment. The other answer choices are incorrect because they do not accurately describe the primary function of the flame safeguard system. Option A is incorrect as the system is not focused on preventing dry firing or overpressure. Option B is too broad, as the system is specifically designed to prevent explosions, not just uncontrolled fires. Option D is incorrect as the system is not primarily focused on overheating of the pressure parts.