The industrial furnace controllable atmosphere furnace uses an artificially prepared atmosphere, which can be passed into the furnace for gas carburizing, carbonitriding, bright quenching, normalizing, annealing and other heat treatments: in order to change the metallographic structure and improve the mechanical properties of the workpiece purpose. In the flowing particle furnace, the combustion gas of fuel or other fluidizing agent applied from the outside is used to forcibly flow through the graphite particles or other inert particle layer on the furnace bed. The workpiece can be buried in the particle layer to achieve enhanced heating and can also be infiltrated. Various non-oxidizing heating such as carbon and nitriding. In the salt bath furnace, the molten salt is used as the heating medium to prevent oxidation and decarburization of the workpiece.　　Smelting cast iron in the cupola is often affected by the coke quality, air supply method, charge condition and air temperature, which makes the smelting process difficult to stabilize and it is difficult to obtain high-quality molten iron. The hot-blast cupola can effectively increase the temperature of molten iron, reduce alloy burning loss, and reduce the oxidation rate of molten iron, thereby producing high-grade cast iron.

Industrial furnaces With the emergence of coreless induction furnaces, cupola furnaces are gradually being replaced. The smelting work of this kind of induction furnace is not restricted by any cast iron grade. It can quickly switch from smelting one grade of cast iron to smelting another grade of cast iron, which is conducive to improving the quality of molten iron. Some special alloy steels, such as ultra-low carbon stainless steels and steels used for rolls and steam turbine rotors, require the molten steel smelted in an open hearth or general electric arc furnace to be removed by vacuum degassing and argon stirring in the refining furnace to further refine it. High-quality molten steel with high purity and large capacity.

The flame furnace has a wide range of fuel sources and low prices. It is convenient to adopt different structures according to local conditions and help reduce production costs. However, the flame furnace is difficult to achieve precise control, which causes serious environmental pollution and low thermal efficiency. The characteristics of the electric furnace are that the furnace temperature is uniform and easy to realize automatic control, and the heating quality is good. According to the energy conversion method, electric furnaces can be divided into resistance furnaces, induction furnaces and electric arc furnaces.　The furnace heating capacity calculated by the furnace bottom area per unit time of the industrial furnace is called the furnace productivity. The faster the furnace heating rate and the greater the furnace loading capacity, the higher the furnace productivity. In general, the higher the furnace productivity, the lower the unit heat consumption per kilogram of material heated. Therefore, in order to reduce energy consumption, it is necessary to produce at full capacity, maximize the productivity of the furnace, and implement automatic proportional adjustment of fuel and combustion air to the combustion device to prevent excessive or insufficient air. In addition, it is necessary to reduce the heat storage and heat dissipation loss of the furnace wall, the heat loss of water-cooled components, the radiation heat loss of various openings, and the heat loss of the flue gas away from the furnace.