Forced circulation air heaters

GT V02 1961005-010

The heating of air or other fluids by heat exchange from hot gases frequently sets severe problems  in  choice  of equipment and materials of construction  owing to the high  temperature of the hot gases  being  handled. Such difficulties as scaling of metals and loss of  strength  are aggravated by the possibility  of local overheating caused by stratification  in the hot gas or by uneven  cooling on the air side of the heat exchanger. The source  of  hot  gas may be  either furnace   waste gases, or, with  independently $red heaters, combustion products from gas or oil burners. This paper describes methods  employed on independently .fired heaters   to reduce  and  control  combustion  product   temperatures without  loss of efficiency. 

C. J. V. Denning