🔍 Key Concepts

• Heat transfer in superheaters and how gas‑side fouling affects metal temperature • Relationship between steam flow (demand) and superheater outlet/metal temperature • Effect of air/fuel ratio on furnace gas temperature

💭 Think About

• Which condition would reduce heat being carried away by steam through the superheater tubes, causing metal temperature to rise? • Which options would increase or decrease furnace gas temperature, and how does that relate to superheater temperature? • Does higher feedwater temperature directly change the gas‑side temperature in the superheater region?

✅ Before You Answer

• Identify which choice reduces steam flow or cooling through the superheater tubes versus which increases it • Decide which factor most directly causes higher gas‑side temperature at the superheater rather than just changing boiler efficiency • Eliminate any options that mainly affect the economizer or drum conditions, not the superheater itself