Series medium frequency electric furnace

The current application of the series medium frequency electric furnace is the foundry industry. It is loved by people in the industry for its high power factor and the realization of one-to-two or one-to-N.

Introduction of series medium frequency electric furnace:

The series medium frequency electric furnace adopts thyristor series rectification and series inverter technology, which can realize that one series inverter medium frequency power supply can simultaneously supply one furnace for melting and one furnace for heat preservation and refining. Such a set of equipment is equivalent to two sets of equipment. The transformer utilization rate is high, which can save half of the transformer capacity usage fee. Due to the use of series rectification and series inverter technology, the power factor is high, which can always be maintained above 0.95, and there is no high-order harmonic pollution. All indicators have reached the requirements of the national power supply department, and there is no need to install reactive power compensation devices and harmonic elimination devices. , The induction coil current is small, the melting time is short, and it can save electricity by 20%. The series medium frequency electric furnace is the most energy-saving and the highest power factor medium frequency equipment today. Its indicators are ahead of the domestic and foreign counterparts and are close to the international advanced level.

The operation mode of series medium frequency electric furnace adopts one for two, one for two, that is, one set of rectifier power supply drives two sets of inverters to operate, or any set of devices can be operated separately to supply power to No. 1 and No. 2 furnaces, dual power supply and one for two Function, especially suitable for large-scale continuous production and operation of small and medium-sized castings. Any electric furnace can be used for high-power smelting operation, and the other furnace body can be insulated or preheated. The power is arbitrarily distributed as needed, and the total power of the two electric furnaces is constant. No change, that is: total power P total = P1 + P2.

Two electric furnaces connected in series with medium frequency electric furnaces continuously alternate smelting and heat preservation casting, and operate at the same time, which can make the power supply always run at full power. This mode of operation has one power supply and two furnaces, which greatly reduces the capacity of the transformer.

Technical parameters of series medium frequency electric furnace:

1. Materials that can be melted by a series medium frequency electric furnace: alloy steel, aluminum, copper and other metal materials
2. Heating power of series medium frequency electric furnace: 100Kw–15000Kw
3. Rated capacity of series medium frequency electric furnace: 0.2T—5T
4. Heating frequency of series medium frequency electric furnace: 100Hz–2000Hz
5. Productivity of series medium frequency electric furnace: generally one furnace per hour
6. The tilting method of series medium frequency electric furnace: hydraulic tilting furnace
7. Cooling of series medium frequency electric furnace: adopt model HSBL- cooling tower cooling

Features of series medium frequency electric furnace:

1. The series medium frequency electric furnace adjusts the power through frequency modulation, so it is relatively less affected by the nature of the load. The whole process of melting almost maintains a constant power output. Because of the series resonance, that is, the voltage resonance, the voltage is high, and the current is small, so the power loss is only small.
2. The series inverter of the series medium frequency electric furnace has high power factor and low harmonics. There is no need to install reactive power compensation devices. The power factor can reach more than 95%, and there is no need to install reactive power compensation devices and harmonic elimination devices. This can save users a lot of money. The power supply department will no longer look for trouble.
3. When the series inverter power supply of the series medium frequency electric furnace is working, the rectifier always works in full conduction, and the output power of the inverter loop is changed by controlling the inverter trigger pulse frequency. And the load current is a sine wave, so the series inverter power supply of the series medium frequency electric furnace will not seriously pollute the grid with high harmonics, and the power factor is high.