What are the differences between universal and industrial electric furnaces?
Is usually a set of industrial furnace equipment, including electric furnace, electric power equipment (electric furnace transformer, rectifier, inverter, etc.), shutter, affiliated auxiliary appliance (choke, compensation capacitance, etc.), vacuum equipment, testing control instrument (electrician instruments, thermal instrumentation, etc.), automatic control system, furnace with mechanical equipment (front-rear machinery and furnace were rotated device, etc.).
Large electric furnace power equipment and testing and control instruments are generally concentrated in the electric furnace power supply room. Compared with fuel furnace, electric furnace has the following advantages: the atmosphere in the furnace is easy to control, and even can be pumped into vacuum; Fast material heating, high heating temperature, temperature easy to control; The production process is easy to realize mechanization and automation. Good labor and health conditions; High thermal efficiency; Good product quality, etc. In metallurgical industry, electric furnace is mainly used for smelting, heating and heat treatment of iron and steel, ferroalloy and non-ferrous metals. The industrial scale electric furnace appeared at the end of the 19th century. Since the 1950s, the proportion of electric furnace in metallurgical furnace equipment increased year by year due to the increase of demand for advanced metallurgical products and the decrease of electricity cost with the development of electric power industry.
Electric furnace can be divided into resistance furnace, induction furnace, arc furnace, plasma furnace, electron beam furnace and so on. There are crucible furnace (coreless induction furnace) and furrow furnace (coreless induction furnace) in industrial applications. Crucibles are made of refractory or steel, with capacities ranging from a few kilograms to dozens of tons. The melting characteristic of the crucible is that the melt in the crucible is electrically driven to force the liquid level of the crucible to rise, and the melt flows from the center of the liquid level to the surrounding, which causes the circulation flow.
This phenomenon is called electric effect, can make the melt composition uniform, the disadvantage is that the slag is biased to the periphery, the coverage is poor. Compared with the melting furnace, the crucible furnace has the advantages of flexible operation, high melting temperature, low power factor and high power consumption. The inductor of melting furnace is composed of iron core, induction ring and lining of melting furnace. In principle, the furnace can be considered as a secondary one - turn coil and short - circuited core transformer. The induction current flows in the melt and the electrothermal transformation is realized.
On 2018-08-08 11:45:46
