Question 317Steam Plants - Assistant Engineer

The correct answer is B) securing fuel oil to the burner. A dirty flame scanner will likely not detect the presence of a flame, which would then trigger the safety systems to secure fuel oil to the burner. This is a standard safety mechanism to prevent unburnt fuel from accumulating and potentially causing a fire or explosion. The other answer choices are incorrect because: A) a dirty flame scanner would not affect the forced draft air, C) the incomplete purge cycle is more likely caused by a problem with the purge timing rather than the flame scanner, and D) increased fuel oil consumption would be more likely caused by improper air-fuel ratio adjustments, not the flame scanner itself.