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Air Preheaters and Boiler Efficiency Quiz

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Air Preheaters and Boiler Efficiency Quiz

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Questions and Answers

What is the main purpose of Air Preheaters (APHs)?

To cool down the incoming air for combustion

To increase the temperature of the flue gas

To increase the pressure drop losses

To improve overall boiler efficiency by transferring heat (correct)

How does air preheater leakage impact boiler efficiency?

It decreases the flue gas flow rate and pressure drop losses

It improves boiler efficiency by lowering flue gas temperature

It increases both the flue gas flow rate and associated pressure drop losses (correct)

It has no impact on boiler efficiency

Which type of APH is the primary focus of the report?

Electrical APH

Regenerative APH (correct)

Combustion APH

Tubular APH

What is the operational principle of regenerative-type APHs?

They use a metal matrix of heat transfer plates to transfer energy between hot flue gas and cold combustion air Signup and view all the answers

Why are proper operating and maintenance practices important for APHs?

They are important for maintaining APH performance and improving boiler efficiency Signup and view all the answers

What is the primary focus of the report?

Importance of plant heat rate in APH decision-making Signup and view all the answers

Why are traditional O&M practices for APHs mentioned in the text?

To contrast with new challenges in APH decision-making Signup and view all the answers

What do APHs do to improve overall boiler efficiency?

Transfer heat from exhaust gases to incoming air Signup and view all the answers

Why should utilities base APH decisions on the benefits of upgrades on plant heat rate?

All of the above Signup and view all the answers

What is the major relationship between APH parameters and heat rate?

APH parameters indirectly affect plant efficiency Signup and view all the answers