Industrial furnaces are divided into two types according to the heating mode: one is flame furnace (or fuel furnace), which uses the combustion heat of solid, liquid or gas fuel in the furnace to heat the workpiece; the other is electric furnace, which converts electric energy into heat for heating.

According to the thermal system, industrial furnaces are divided into two types: one is intermittent furnace, also known as periodic furnace, which is characterized by no division of temperature section in the furnace. The furnace is produced in one or two shifts, and the furnace temperature changes in each heating cycle, such as various chamber furnace, trolley furnace, well furnace, hood furnace, etc; The second is the continuous furnace, which is characterized by dividing the temperature section in the furnace, which is generally composed of preheating, heating (high temperature) and soaking (heat preservation). The furnace is produced continuously in three shifts. In the heating process of industrial furnace, the temperature in each section can be considered unchanged, such as two or three section continuous heating furnace, push rod heating furnace and heat treatment furnace, annular furnace, walking furnace and vibrating bottom furnace It is mainly used in rotary furnace, cupola and lime kiln.