In a "D" type marine boiler, operating under...

Question 1 of 270705eccefa0bacbc34ba4d46e13

In a "D" type marine boiler, operating under constant load, which of the following conditions could cause the superheated steam temperature to rise above normal?

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Question 1 of 27070

In a "D" type marine boiler, operating under constant load, which of the following conditions could cause the superheated steam temperature to rise above normal?

🔍 Key Concepts

• Heat balance in a D-type marine boiler and how changes in combustion affect gas temperature at the superheater • Relationship between excess air / combustion air and furnace gas temperature • Effect of feedwater temperature and deaerating feed tank (DFT) pressure on drum conditions versus steam temperature

💭 Think About

• Which of these options directly affects the furnace gas temperature going over the superheater elements? • Do changes in feedwater temperature or DFT pressure primarily change steam temperature, or do they more strongly affect drum level, steaming rate, and efficiency? • What happens to flame temperature and gas temperature when there is not enough air for complete combustion?

✅ Before You Answer

• Identify which choice would most likely change the flue gas temperature at the superheater inlet under constant load • Check which factors mainly influence drum pressure and saturation temperature, not the superheater outlet temperature • Verify how insufficient combustion air affects flame temperature, smoke, and stack conditions in a boiler