Under normal firing rates, a reduction of...

Question 1 / 270705eccefa0bacbc34ba4d46e1e

Question 1 of 270705eccefa0bacbc34ba4d46e1e

Under normal firing rates, a reduction of the steam outlet temperature from an uncontrolled superheater could be caused by __________.

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Question 1 of 27070

Under normal firing rates, a reduction of the steam outlet temperature from an uncontrolled superheater could be caused by __________.

🔍 Key Concepts

• heat transfer in boilers between hot gas and steam/water sides • location and function of an uncontrolled superheater in the gas path • how excess air and fouling of tubes change gas temperature around the superheater

💭 Think About

• For each choice, ask: does this make the furnace / gas path hotter or cooler where the superheater sits? • Remember an uncontrolled superheater has no attemperator or spray control – its outlet temperature mostly follows the gas temperature around it. • Think through the gas flow path: furnace → generating tubes → superheater → economizer (general order). Which problem would most directly lower gas temperature at the superheater?

✅ Before You Answer

• Verify which options would increase gas temperature at the superheater (those are unlikely to reduce outlet steam temperature). • Check which fouling (generating tubes vs economizer tubes) would tend to make less heat absorbed earlier in the path, leaving hotter gas for later sections. • Consider which factor can lower gas temperature even if firing rate (heat input) stays the same, by changing the mass of gas and dilution rather than the fuel energy.

Question 1 of 27070

Under normal firing rates, a reduction of the steam outlet temperature from an uncontrolled superheater could be caused by __________.

high feed water temperature

too much excess air

dirty generating tubes

fouled economizer tubes

Question 1 / 270705eccefa0bacbc34ba4d46e1e

Question 1 of 270705eccefa0bacbc34ba4d46e1e

Under normal firing rates, a reduction of the steam outlet temperature from an uncontrolled superheater could be caused by __________.

Back

Question 1 of 27070

Under normal firing rates, a reduction of the steam outlet temperature from an uncontrolled superheater could be caused by __________.