A flue gas air heater, when installed in a...

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Question 1 of 205eccefa0bacbc34ba4d46ed1

A flue gas air heater, when installed in a boiler, would be accompanied by the operating characteristic(s) of __________. higher furnace temperatures than a boiler without an air heater greater heat absorption per pound of fuel

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🔍 Key Concepts

• Flue gas air heater (air preheater) – what it does to the temperature of the incoming combustion air and overall boiler efficiency • Relationship between combustion air temperature and furnace temperature • How heat recovery from exhaust gas affects the amount of heat obtained per pound of fuel

💭 Think About

• If you warm the incoming combustion air using hot flue gas, what happens inside the furnace for the same fuel input? Consider flame stability and temperature. • Think about boiler efficiency: does recovering heat from the exhaust usually increase or decrease the useful heat absorbed per pound of fuel? • Could any of the statements be clearly impossible or contradictory to the basic purpose of installing an air heater?

✅ Before You Answer

• Verify how a flue gas air heater changes the temperature of air entering the burners compared to ambient air. • Check whether recovering waste heat from flue gas is typically used to improve or reduce boiler efficiency. • Ask yourself if it would make sense, from a design standpoint, to add an air heater that results in no gain in heat absorption per pound of fuel.

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