🔍 Key Concepts

• Superheater function – what does a superheater do to steam after it leaves the boiler drum? • How heat transfer to the superheater changes if gas temperature, gas flow, or boiler cleanliness change • Difference between problems that affect steam temperature vs. overall boiler efficiency/pressure

💭 Think About

• For each option, ask: does this condition tend to make the gas side around the superheater hotter or cooler? • Which option would most directly reduce the amount of heat available to be picked up by the superheater tubes at a normal firing rate? • Think about where in the boiler each item (feedwater, excess air, generating tubes, economizer) acts, and how that would influence the flue gas temperature entering the superheater.

✅ Before You Answer

• Identify which listed condition would lower flue gas temperature reaching the superheater more than the others. • Distinguish between something that mainly affects steam quantity/pressure and something that directly affects steam outlet temperature. • Make sure your choice is something that could occur even when the firing rate is normal, not only at high or low firing.