How to save energy by smelting process of electric furnace

Nov 15, 2022


In the metal smelting industry, induction furnaces are widely used

In the metal smelting industry, induction furnaces are widely used. In actual production, reasonable use of electric furnaces is of great significance to the entire production line, especially in improving production efficiency and reducing energy consumption.

Today, Luoyang Shennai will summarize with you how to use the smelting process of electric furnace to save energy.

The first is the packing materials that need to be treated reasonably. The charged furnace materials must be properly classified according to chemical composition, impurity content and block size. Large and long scrap steel shall be cut, and light and thin materials shall be packaged if possible to ensure smooth charging.

The size of packing block shall be consistent with the power frequency, and the power frequency used for induction furnace will decrease with the increase of furnace capacity. The penetration of the induced current into the deep layer is properly matched with the the geometric dimensions of the the metal charge.

This work can shorten heating time, improve thermal efficiency and reduce power consumption. Avoid the unqualified composition of furnace charge, delay the smelting time of the whole process, increase the material and power consumption, and even cause the scrap of molten steel.

At the same time, we should try to extend the continuous smelting time. The unit power consumption is closely related to the smelting method. According to the data, in consideration of the energy loss required for slag melting and overheating, the unit power consumption is 580kw * h/t when the advanced medium frequency induction smelting furnace is cold started. During hot furnace operation, the unit power consumption is 505-545 kw * h/t; if continuous charging operation is conducted, the unit power consumption is 494 kw * h/t.

Therefore, if conditions permit, centralized continuous smelting shall be arranged as much as possible, and one smelting furnace shall be increased as much as possible to extend the continuous smelting time, reduce the number of cold furnace smelting and reduce power consumption.

Another aspect is that we should adopt reasonable furnace front operation technology, such as controlling the amount of subsequent furnace charge added each time of temperature rise. After the molten steel is transferred to the ladle, an appropriate amount of heat preservation agent and slag remover should be put in time, which can reduce the loss of molten steel in the process of killing and pouring, and the tapping temperature can be appropriately reduced to save power consumption.

In smelting operation, the temperature shall be raised for a short time before pouring, while the molten iron shall be kept at a lower temperature for the rest of the time, which can reduce the erosion of high-temperature molten iron on the furnace lining, extend the service life of the furnace lining, and reduce power consumption.

Finally, we can save electricity and reduce consumption by strengthening the management and maintenance of furnace equipment. Standardize the operation process requirements of furnace building, drying, sintering, smelting, etc., and strictly implement the maintenance system of relevant power supply, so as to effectively improve the furnace life, ensure the normal operation of the electric furnace, and reduce power consumption.

This is our knowledge sharing today about making the smelting process of electric furnace more energy saving. I hope it can help you.

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