How to grasp the selection skills of intermediate frequency furnace charge?

The intermediate frequency induction furnace is an induction coil made of copper tube wound on the outside of the furnace, and the metal charge is installed in the furnace. When the alternating current passes through the induction coil, an alternating magnetic flux first occurs in the coil, and passes through the closed metal charge. An induced current occurs within a certain depth of the surface, causing the charge to heat and melt.

The furnace lining is made of refractory materials. The intermediate frequency furnace charge requires good corrosion resistance, resistance to falling off, no cracks, and long service life. Below, Yuhua Xiaobian will explain to us the selection skills of the intermediate frequency furnace charge., Intermediate frequency furnace charge selection skills

1. It is necessary to grasp the chemical composition of the various charge materials used, carry out careful and reasonable batching accounting, and use the reasonable allocation of various charge materials to ensure that the primary chemical composition in the molten steel meets the requirements, and the content of harmful impurity elements is as small as possible, and does not exceed the standard. , To avoid delaying the smelting time due to adjustment of the composition, due to the unqualified composition of the molten steel, the waste of molten steel, the consumption of additives, and the consumption of electricity.

2. The charge must be properly classified according to the chemical composition, impurity content and block size, cut large and long scrap, and conditionally handle light and thin materials to ensure smooth feeding and reduce smelting time.

3. The size of the charge block size should be adapted to the power frequency. The power frequency used by the induction furnace decreases with the increase of the furnace capacity. Therefore, large-capacity intermediate frequency furnaces can use large pieces of charge, and small-capacity induction furnaces can use small pieces of charge. Induction The current distribution in multimetallic conductors obeys the skin response.

4. The induced current in the charge and molten steel should be gradually weakened from the surface to the center according to the skin. The distance from the point where the current intensity is reduced to 36.8% of the surface current intensity to the surface of the conductor is called the current penetration depth. The induced current mainly penetrates into the deep layer, and the heat of the reinforced heating material is mainly supplied from the outer layer. In order to obtain the same temperature of the entire cross-section of the charge, with the extension of the heating time, the heat lost from the charge to the surrounding medium increases. As a result, the heat rate decreases. If the penetration depth and the geometric size of the charge are properly matched, the heating demand time is short and the heat rate is high.