![]() Stack is the vertical pipe through which combusted gas or flue gas is vented out into the atmosphere. The shield section is the name given to the first two rows leading into the convection section. The convection zone is “out of sight’’ of the burners although some heat transfer occurs by radiation because the temperature is still high enough, most of the transfer here is by convection mode. In the radiant zone, heat is transferred predominantly (about 90%) by radiation. These zones are identified in a typical heater such as that of Fig-1. The heat is transferred by direct radiation, convection, and also by reflection from refractory walls lining the chamber. There are different modes of heat transfer occurred in fire heaters. What are the different modes of heat transfer in a fired heater or Furnace? Basically, this heat energy is released by combusting fuels into an open space and transferred to the fluids inside tubes which are ranges along the walls and roofs of the combustion chamber. The maximum flame temperature of hydrocarbon burned with stoichiometric air is about 3500ᵒF (1926ᵒC). ![]() Fire heater works by direct heat transfer from the product of combustion of fuels.
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