The advances in science and technology of hot-blast stoves, especially the close combination of information and network technology with scientific research and production, provide enormous technical possibilities to improve the automation and intelligence of heat treatment of industrial electric furnaces. Compared with fuel furnaces, the electric furnaces are characterized by easy control of the gas in the furnaces, even vacuum pumping, high heating temperature, easy control of temperature, and high possibility of mechanization and automation of production process.
With the development of computer technology and automation technology, computer control system is widely used in industrial automation, which greatly improves the technical level of plant equipment, promotes production, improves product quality and ensures the safety and reliability of production. Industrial electric furnace has become a major pillar of industrial automation. Since the 1950s, the demand for high-grade metallurgical products has increased and electricity charges have declined with the development of electric power industry, so the quota of electric furnace in metallurgical furnace equipment has increased year by year. Many industrial electric stoves are annealing furnace, resistance furnace, quenching furnace, salt bath furnace, box type hot blast furnace, well type hot blast furnace, trolley hot blast furnace, gas carburizing hot blast furnace.
In the casting workshop, there are cupolas, induction furnaces, resistance furnaces, electric arc furnaces, vacuum furnaces, open hearth furnaces, crucible furnaces, etc. for smelting metals; sand mold drying furnaces for baking sand molds, iron alloy baking furnaces, and casting annealing furnaces; preheating furnaces for welding parts and tempering furnaces after welding in the welding workshop; ingot or steel embryo feeding in the forging workshop. Various heating furnaces heated before forging; various annealing, normalizing, quenching and tempering furnaces for improving the mechanical properties of workpieces in metal heat treatment workshops. Industrial electric furnaces are also widely used in other industries, such as distillation and cracking furnaces in the petroleum industry, ore sintering and coking furnaces, cement and glass furnaces in the silicate industry. The industrial electric furnaces can be divided into two categories according to the thermodynamic system: intermittent furnaces, also known as periodic furnaces, and continuous furnaces. The characteristics of periodic furnaces are that the temperature of the furnaces varies in each heating cycle during intermittent production.
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