There Are Types Of Furnaces Based On Their Tubes And Sections

Apart from its shape, it turns out that there are still several types of furnaces based on the arrangement of the tubes in the radiation and convection sections. Here are some types of furnaces based on these features. Apart from that, if you’re looking for a residential furnace, perhaps you also need to know about gas furnace prices by size.

Heater With Vertical Coil

Most of its heating coil is in the form of a vertical tube. In some installations, the oil economizer section, the air preheater section, or both are installed above the vertical heating section. The tube in the convection section can be either vertical or horizontal arrangement.

Heater With Helical Coil

A helical coil heater is a cylindrical casing heater with a spiral coil in the radians section following the shape of the heater wall. These heaters generally do not have a convection section, but if there are, the surface of the convection can be in the form of a flat spiral or in the form of a horizontal bank tube. The stack of the helical heater coil is mostly located directly above the heater.

Heater With Coil Arbor

The arbor coil heaters are mostly used in catalytic reforming units for the purpose of preheating and reheat for gas and process air. This heater has a radians section consisting of inlet and outlet headers connected by L or U shaped tubes in a parallel arrangement. Convection section in the form of a conventional horizontal coil tube.

The furnace consists of several main parts, such as:

Radiation Section

It consists of a combustion chamber where the tube is placed around the combustion chamber. Each tube is connected to an elbow. Process fluid is circulated in a series of tubes, and heat is transferred from the fuel by radiation. The temperature of the flue gas (exhaust gas) coming out of the radiation section is quite high (ranging from 700 to 1100 degrees C).

Convection section

To recover the sensible heat from the flue gas, the process fluid is circulated at high speed through a series of tubes that are installed in parallel or perpendicularly, to a part where heat is transferred by convection.


Serves to drain the combustion gas (flue gas) into the free air.