Boiler stack gas temperatures will be higher...

Question 1 / 205eccefa0bacbc34ba4d46e64

Question 1 of 205eccefa0bacbc34ba4d46e64

Boiler stack gas temperatures will be higher than normal when __________.

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Question 1 of 20

5eccefa0bacbc34ba4d46e64

Boiler stack gas temperatures will be higher than normal when __________.

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🔍 Key Concepts

• complete vs incomplete combustion and how they affect stack temperature • the effect of excess air on flame temperature and heat transfer • what happens when combustion continues beyond the furnace (secondary combustion)

💭 Think About

• Think about which condition would cause hot gases to still be releasing heat as they travel up the stack rather than in the furnace where it belongs. • Consider whether more or less excess air generally leads to higher flame temperatures and how that affects stack temperature. • Ask yourself which option would reduce heat transfer to the water/steam side so that more heat remains in the flue gas leaving through the stack.

✅ Before You Answer

• For each choice, decide if it makes the flue gas hotter at the point it enters the stack or cooler. • Check which options would cause poor heat absorption by boiler surfaces, leaving higher temperatures in the gas. • Verify which condition is most associated with afterburning/secondary combustion versus normal primary combustion in the furnace.

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Question 1 of 20

Boiler stack gas temperatures will be higher than normal when __________.

fuel temperature at the burners is excessively high

not enough excess air is being supplied for combustion

secondary combustion is occurring in the gas passages

internal water wall refractory baffles have failed

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Question 1 / 205eccefa0bacbc34ba4d46e64

Question 1 of 205eccefa0bacbc34ba4d46e64

Boiler stack gas temperatures will be higher than normal when __________.

Back

Question 1 of 20

5eccefa0bacbc34ba4d46e64

Boiler stack gas temperatures will be higher than normal when __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed