Direct and indirect heating hot air furnace difference between

What is the difference between direct heating hot air furnace and indirect heating hot air furnace

According to heating mode, what is the difference between direct heating hot air furnace and indirect heating hot air furnace

Direct heating hot air furnace, is the use of flue gas heating hot air furnace. Indirect heating hot air furnace, is the use of heat transfer heat to clean air.

The process of directly heating the air in a hot blast furnace is very simple. First, the air is fed into the combustion chamber by a fan. Then, with the participation of oxygen in the air, the fuel burns to give off heat to form flue gas, and finally, the air is fed into the drying chamber by a fan.

Indirect heating hot air furnace, because clean air and smoke are completely separated, it is different from direct heating hot air furnace in the heat exchanger.

Whether directly heating hot air furnace or indirectly heating hot air furnace, in the hot air or flue gas outlet is generally equipped with cold air inlet, in order to adjust the temperature of the medium, meet the requirements of the process.