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　　The emergence and development of any industry are inseparable from advances in science and technology. This, in turn, is driven by the ever-expanding market demand, which spurs industry players to continuously update and upgrade their products. In the manufacturing sector, this demand is even more pronounced—for instance, the processing of melting furnaces has shifted from traditional methods toward more advanced technological approaches. So, what are the key characteristics of these advanced processes? And when we use them, how should we proceed? Melting furnace manufacturer What should we pay attention to?

　　The manufacturer of melting furnaces defines a melting furnace as equipment used to melt metal ingots and some scrap metal, add necessary alloying elements, and then refine the molten material through processes such as slag removal and refining to produce the desired alloy. Depending on the type of heating energy used, melting furnaces can be classified into two main categories: fuel-fired furnaces (including those powered by natural gas, liquefied petroleum gas, coal gas, diesel, heavy oil, coke, and other fuels), which rely on the heat generated from the combustion of these fuels; and electrically heated furnaces, in which resistance elements are heated by passing an electric current through them, or in which an alternating magnetic field is generated by passing a current through a coil, inducing eddy currents that heat the charge within the magnetic field.

　　 Melting furnace manufacturer The introduction explains that the direct heating method refers to a heating approach in which the heat generated during fuel combustion or by resistive elements is directly transferred to the charge material in the melting furnace. This method boasts high thermal efficiency and a simple furnace structure. However, harmful gases volatilized from the charge material or covering agents in the melting furnace can corrode the resistive elements, thereby shortening their service life. Furthermore, according to the melting furnace manufacturer, the combustion process often involves excessive air content in the combustion products, leading to significant metal oxidation and loss during the heating process.

　　The smelting furnace manufacturer states that there are two types of indirect heating methods for smelting furnaces. In these methods, the combustion products or electrically heated resistive elements do not directly heat the charge; instead, they first heat a heat-transfer medium such as radiation tubes, which then transfer heat to the charge via radiation and convection. In the alternating magnetic field method, induced currents heat the charges within the magnetic field, while the heating elements—such as induction coils—are separated from the charges by a lining material. The advantage of indirect heating is that the combustion products or electric heating elements are kept separate from the charge, eliminating any harmful interactions between them. This helps maintain and improve the quality of the charge and reduces metal burn-off. The smelting furnace manufacturer also notes that induction heating has a stirring effect on the molten metal, which can accelerate the melting process, shorten melting time, and further reduce metal burn-off. However, the downside is that heat cannot be directly transferred to the charge. Compared with direct heating, indirect heating has lower thermal efficiency and a more complex furnace structure.

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