Question

b) Why are the bricks heated in a kiln? class 4​

Answer 1

$\large\fbox\red{Answer}$In a continuous kiln fire is always burning and bricks are being warmed, fired and cooled simultaneously in different parts of the kiln. ... Heat in the flue gas is utilised for heating and drying of green bricks and the heat in the fired bricks is used for preheating air for combustion.

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Answer 2

Heat in the flue gas is utilised for heating and drying of green bricks and the heat in the fired bricks is used for preheating air for combustion. Due to incorporation of heat recovery features, continuous kilns are more energy efficient.