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How to save energy and save electricity in the intermediate frequency melting furnace
The development of the intermediate frequency melting furnace benefits from the use of static frequency converters. Compared with magnetic frequency converters, the efficiency of these frequency converters is as high as 95% to 98%. The rated power of the inverter used as the induction furnace is constantly increasing. Recently, the 9 000 kW inverter has been put into production, and it is connected to a furnace with a capacity of 12 t. The productivity of molten iron can reach 18 t/h; the intermediate frequency melting furnace The power density per ton of melting capacity is increased to 1 000 kW, which shortens the melting period to 35 min. The melting rate of the induction furnace varies with the capacity of the furnace. Generally, the melting rate of molten iron in the intermediate frequency melting furnace is 0.4 to 35 t/h.
For example, using a 2t capacity furnace, a melting rate of 2 to 2.38 t/h can be obtained, and a 12 t furnace can achieve a melting rate of 18 to 21 t/h; while a power frequency induction furnace is used to melt the melting rate of the cold material. The 1.5 t furnace is 0.75 t/h, the 3 t furnace is 1.5 t/h, the 5 t furnace is 2.5 t/h, and the 10 t furnace is only 4 t/h. It can be seen that the melting rate of the intermediate frequency melting furnace far exceeds the power frequency induction furnace, which can be used to replace the larger capacity power frequency induction furnace with a smaller capacity medium frequency melting furnace when selecting the cast iron production melting equipment. Condition, the medium frequency furnace replaces the power frequency furnace, which not only reduces the land use, but also reduces the investment, and also ensures the continuous supply of molten iron. It is very beneficial for the continuous operation and the production of cast iron with large production capacity. The medium frequency melting furnace is used for the continuous casting or centrifugal casting of the molten iron produced by the ductile iron pipe, and it can be used to replace the cupola, or double with the blast furnace and the cupola, and the production capacity can be fully utilized. For example, a centrifugal ductile iron pipe manufacturer uses a 10 t intermediate frequency melting furnace and a blast furnace double process to raise the temperature and adjust the composition of the molten iron, and heat the stored blast furnace molten iron from 1300 °C to 1520 °C. 27 min. The furnace has a frequency of 100 to 200 Hz and a power of 2,500 kW.
The intermediate frequency melting furnace has high electrical efficiency and thermal efficiency, which not only increases the melting rate, shortens the melting time, but also reduces the unit power consumption. Compared with the power frequency induction furnace, the power consumption can be reduced from 700 kW.h/t to 515-580 kW.h/t. The relevant data show that the unit power consumption is about 582 kW.t/h when the intermediate frequency melting furnace is cold-started, and the unit power consumption is 505-545 kW when the medium-frequency melting furnace is cold-started, considering the energy loss required for melting and superheating of the slag. .h/t, if continuous feeding operation, the unit power consumption is only 494 kW.h/t.
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