This section contains rows of tubing which protects the tubes from direct heat. The convection section removes heat from the flue gas to preheat the contents of the tubes and significantly reduces the temperature of the flue gas exiting the stack. This section consists of the coil inlet, which is preheated by a feed charge. Most of the heat is gained in the radiant zone which is lined with refractory lining. The radiant tubes are located along the walls of the radiant section and receive radiant heat directly from the burners at the bottom or target wall in the middle. They include the following: Radiant section, Convection section, Shield section and Stack and Breeching sections. There are various furnace designs for different functions, but all share several common features and components to its design. What is a direct fired heater? Also known as an industrial furnace, a fired heater is a direct-fired heat exchanger that uses the hot gases of combustion to increase the temperature of a feed flowing through coils of tubes aligned throughout the heater.
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