Question 172Steam Plants - Assistant Engineer

The correct answer is C) low superheater outlet temperature. Insufficient combustion air supply to the furnace would reduce the efficiency of the combustion process, resulting in lower heat transfer to the superheater. This would lead to a lower superheater outlet temperature, as the superheater is not receiving enough heat to raise the steam temperature to the desired level. The other options are incorrect because: A) High feed water consumption is not directly related to insufficient combustion air. B) The fires sputter due to improper air-fuel ratio, not just insufficient air. D) High stack temperature is more likely to occur when there is excessive air supply, not insufficient air.