What is the difference between medium frequency furnace ...

The main differences between power frequency furnace and medium frequency induction furnace are as follows:

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1. Medium frequency furnace has high power density and high productivity That is, under the same stirring force and capacity, the medium frequency furnace can input three times the power of the power frequency furnace. In other words, the crucible size of the medium frequency furnace with the same power is only one third of that of the power frequency furnace In larger furnaces, due to the influence of inductor line current and voltage, the input power of medium frequency furnace is about two times that of power frequency furnace Therefore, the average power consumption of medium frequency furnace is lower than that of power frequency furnace

2. The medium frequency furnace can empty the charge during each smelting, which is easy to change the variety of molten metal. It has fast starting melting, no need to start melting, and easy to use The power frequency furnace needs to leave part of the remaining molten iron for the next 4 melting, otherwise the starting block should be used

3. Under the same productivity conditions, the selected medium frequency furnace has small capacity, so the floor area is small, the amount of furnace lining materials is small, and the operation cost is low

4. The operation reliability of medium frequency furnace is high and the utilization rate of equipment is improved

5. Compared with power frequency furnace, medium frequency furnace has less stirring force, less metal scouring on furnace lining and long service life of furnace lining In recent years, with the development of SCR medium frequency power supply technology, large-scale high-power medium frequency smelting furnace has developed rapidly, which has been adopted by more and more users, and has the trend of gradually replacing small and medium-sized power frequency furnace This paper compares and analyzes the energy consumption of power frequency furnace and medium frequency furnace, and provides necessary technical data as a reference for feasibility analysis and scheme selection

Medium frequency induction furnace is a kind of three-phase power frequency alternating current, rectified into direct current, and then the direct current into an adjustable current, supplying the alternating current flowing through the capacitor and the induction coil, and generating high density in the induction coil The magnetic lines of force and cut the metal material contained in the induction coil, which produces a large eddy current in the metal material. This eddy current also has some properties of medium frequency current, that is, the free electrons of the metal itself flow in the resistive metal body to generate heat.

The medium frequency electric furnace uses an medium frequency power supply to establish an medium frequency magnetic field, which induces eddy currents and generates heat inside the ferromagnetic material, thereby achieving the purpose of heating the material. The medium frequency electric furnace uses 200-2500Hz medium frequency power supply for induction heating, melting and heat preservation. The medium frequency electric furnace is mainly used for smelting carbon steel, alloy steel, special steel, and can also be used for smelting and heating of non-ferrous metals such as copper and aluminum. The equipment is small in size and weight. Lightweight, high efficiency, low power consumption, fast melting and heating, easy control of furnace temperature, and high production efficiency.

Constant power output, faster melting speed, more obvious power saving effect. The zero-voltage sweep software is started, which is more suitable for frequent start-up requirements. Comprehensive protection measures, such as over-current, over-voltage, current-limiting, pressure-limiting, water shortage, and equal protection, ensure reliable operation of the equipment under the premise of ensuring the melting speed. The operation is simple, and it is suitable for various casting processes.

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Medium frequency electric furnace for multiple occasions

(1) Standard parts heating forging

(2) Melting of various metal materials

(3) Heating coordination of motor rotor

(4) Heating pipe expansion at the end of steel pipe

(5) Die heat

(6) Medium frequency quenching of shafts

(7) Preheating of welds or tempering after welding, etc.

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