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What does regenerative air preheater consists of?

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What does regenerative air preheater consists of?

(a) Rotor

(b) Skewers

(c) Propeller

(d) Piston

I got this question in semester exam.

The above asked question is from Boiler Mounting Accessories in portion Steam Generators & Accessories of Energy Engineering

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Best answer
The correct answer is (a) Rotor

The best explanation: This type of air preheater consists of a rotor which turns about 2 to 3rpm. The rotor is filled with thin corrugated metal elements. Hot gases pass through one half of the heater and air through the other half. As the rotor turns, the heat storage elements transfer the heat absorbed from the hot gases to the incoming air.

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