1, classified by heating mode:
● Direct heating furnace: by directly transferring the heat source to the heated object, such as flame heating furnace and electric heating furnace.
● Indirect heating furnace: heat is transferred to the heated object through medium (such as gas, liquid or solid), such as fluid circulation heating furnace and radiation heating furnace.
2, according to the classification of heating medium:
● Gas heating furnace: heating with gas as fuel, such as natural gas and liquefied gas.
● Electric heating furnace: electric energy is used for heating, such as resistance heating furnace and arc heating furnace.
● Liquid heating furnace: It uses liquid medium (usually oil or water) to transfer heat for heating, such as oil-immersed heating furnace and water-immersed heating furnace.
3, according to the heating temperature range classification:
● Low-temperature heating furnace: generally used for heating in a lower temperature range, such as room temperature to several hundred degrees Celsius.
● Medium temperature heating furnace: suitable for heating in the medium temperature range, such as several hundred degrees Celsius to several thousand degrees Celsius.
● High temperature heating furnace: used for heating in high temperature range, such as 1000 degrees Celsius or above.
It should be noted that the specific heating furnace types and heating methods will be different according to different application fields, process requirements and characteristics of heating objects. When choosing a suitable heating furnace, it is necessary to determine the most suitable type and heating mode according to specific requirements.