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In the method of ‘Tilting burners in the furnace’ at what degree are the burners tilted?

In the method of ‘Tilting burners in the furnace’ at what degree are the burners tilted? Correct Answer 30o

In this following method of a superheater temperature control burners in the furnace are tilted up or down through a range of 30o. When burners are tilted downwards much of heat is given to the water walls by the gas and the gas entering the super heater region is relatively cool.

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