Luoyang HongtengIntermediate frequency induction furnace
As a commonly used heating equipment, the intermediate frequency electric furnace has a problem that many users have to consider when using it. That is how to adjust the heating speed of the electric furnace. In response to this problem, we have summarized some knowledge and experience here, and shared with you today. From the analysis of the design of the electric furnace, the heating speed is determined by the heating power of the intermediate frequency furnace, the material of the heating blank and the heating temperature. After these factors are determined, the heating speed of the intermediate frequency furnace is also determined. Therefore, theoretically speaking, the heating speed of the intermediate frequency furnace is fixed, and what will affect the heating speed of the electric furnace at this time is the power output of the electric furnace. In the normal use of the intermediate frequency furnace, the factors that affect the power output of the intermediate frequency furnace, and then affect the speed or heating speed of the intermediate frequency furnace are as follows: (1) The rectifier circuit part of the intermediate frequency furnace is not adjusted properly, the DC voltage does not reach the maximum value, the rectifier...
We have introduced a lot of relevant knowledge about induction furnaces. Today, Hongteng editor will summarize the classification of induction furnaces. Induction furnaces are classified according to their structure, and there are two categories: crucible type (coreless induction furnace) and groove type (cored induction furnace). Crucible coreless induction furnaces can be divided into power frequency furnaces and intermediate frequency furnaces according to different frequencies. According to different structures, grooved cored induction furnaces can be divided into vertical furnaces and horizontal furnaces. In the field of foundry, induction furnaces are used for three purposes: melting, holding and pouring. According to these different uses, electric furnaces can be divided into: melting furnaces, holding furnaces and pouring furnaces. Power frequency crucible induction furnace is mainly used for smelting cast iron and non-ferrous metals. Due to the large electromagnetic stirring force, the life of the furnace lining is very short during steelmaking. Therefore, it is not suitable for steelmaking unless the life of the refractory material can be solved. For non-ferrous metals with strict gas content requirements (such as oxygen-free copper), it is not suitable to use power frequency crucible induction furnaces. When the power frequency crucible induction furnace is used as a holding...
Regarding the use of induction furnaces, there are many things to pay attention to during smelting operations. The editor of Hongteng summed up some knowledge in this area and shared it with you today. Pig iron: For the medium frequency induction furnace with the advantage of rapid smelting, it is agreed that it is better to add pig iron in the early stage of smelting. This is because the shape of pig iron is relatively consistent, and it is easy to obtain high induced current, which is beneficial to improve the smelting speed. Recarburizer: For intermediate frequency electric furnace, it is best to gradually add recarburizer when the metal charge is added. If it is added too early, the recarburizer will adhere to the vicinity of the furnace bottom; if it is added too late, it will not only delay the adjustment of the melt composition in the furnace, but also may cause excessive heating errors. Ferrosilicon: The higher the Si content in the molten iron, the slower the carburization rate is when the carburizer is added. Therefore, for the medium frequency induction furnace with weak stirring force, it is better to add ferrosilicon later. Adding too early, the metal...
Induction furnaces are widely used, and the design of large-scale industrial-frequency crucible induction furnaces often needs to take into account the refractory materials for the furnace lining. In general, the lining materials of induction furnaces are mainly based on the utilization rate and economy of the furnace. In order to ensure the normal operation of the induction furnace, the refractory materials of the furnace lining generally have the following requirements: 1. Sufficient refractoriness Materials with a refractoriness higher than 1580°C are called refractories. The operating temperature of the furnace lining is generally lower than the temperature of the molten metal. However, based on the requirements for the life of the furnace lining, some areas of the furnace body have to be considered, and the temperature is too high. In cast iron induction furnaces, it is often unsafe to use materials with low refractoriness. As the lining material of cast iron induction furnace, its refractoriness should be greater than 1650-1700℃. 2. Good thermal stability Induction furnaces rely on electromagnetic induction to exchange energy. In order to ensure high electrical efficiency of the furnace, the thickness of the furnace lining of the induction coil is limited. In addition, the temperature of the...
In the metal smelting industry, induction furnaces are widely used. In actual production, the rational use of electric furnaces is of great significance to the entire production line, especially in improving the production efficiency of the production line and reducing energy consumption. Today, the editor of Hongteng will summarize with you how to use the smelting process of electric furnace to save energy. The first is the need to properly handle the charge in the furnace. The charged charge must be properly classified according to chemical composition, impurity content, block size, etc., cutting large and long scrap, and conditionally handling light and thin materials to ensure smooth charging. The size of the filler block should be adapted to the frequency of the power supply. The power frequency used by an induction furnace decreases as the furnace capacity increases. The penetration depth of the induced current matches the geometry of the metal charge. This work can shorten heating time, improve thermal efficiency, and reduce power consumption. Avoid delaying the smelting time of the whole process due to unqualified filling material components, increasing material consumption, power consumption, and even scrapping molten steel. At the same time, we should try to extend the...
The melting furnace body of the circuit is mainly composed of induction coil, refractory material and magnetic yoke. The induction coil is wound from a hollow copper tube, and then the tube is cooled by water. The section of the copper pipe can be round or square, and the square is more efficient. Inside the induction coil, a crucible made of refractory material is knotted. The metals to be smelted, such as various steels, are placed in the crucible, and then the electromagnetic induction heating principle is used. When the induction coil passes an intermediate frequency current, an intermediate frequency magnetic field is generated , in which most of the magnetic field passes through the steel and is called the main flux. However, there is still a part of the magnetic field that does not pass through the steel, which is called leakage flux. Only the main magnetic flux can generate an induced potential in the steel, form an eddy current, and make the steel in the furnace heat up. The leakage magnetic flux forms a leakage current, which only reduces the voltage on the circuit, but cannot complete the heating. The relative magnitude of the main flux and leakage...
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