Furnace core coil type high-medium-low frequency smelting furnace

Abstract

Disclosed is a furnace core coil type high-medium-low frequency smelting furnace. A furnace core power supply coil and a center iron core are designed in the center of a combustion chamber of the high-medium-low frequency smelting furnace. The furnace core power supply coil is wound on the center iron core. The center iron core is fixed to the center of the furnace bottom perpendicularly, or the center iron core in the combustion chamber and part of an iron core arranged at the furnace bottom and on a furnace shell form an E-shaped magnetic field loop. The furnace core power supply coil and the center iron core have cooling measures. The middle of the furnace bottom of the smelting furnace is provided with cooling medium inlet-outlet connectors of the furnace core power supply coil and the center iron core. Insulation and refractory materials are arranged outside the center iron core and the furnace core power supply coil, and the center iron core and the furnace core power supply coil are isolated from combustion chamber working materials. Magnetism isolating is conducted on the furnace bottom of the combustion chamber of the smelting furnace and the furnace shell, suitable materials are selected, a closed loop and eddy heating are prevented, and water cooling is conducted on the smelting furnace shell in necessity.

Description

Technical field: [0001] High, medium and low frequency melting furnaces are important devices for metal casting and scrap metal smelting, and their power consumption accounts for more than 20% of China's total annual electricity consumption. and the key to efficient smelting. Background technique: [0002] Traditional high-, medium- and low-frequency melting furnaces all adopt hollow furnaces. The inside of the furnace shell is made of insulating refractory materials. There are no coils and magnets in the middle of the furnace. Water cables are used to supply coils outside the furnace shell of the furnace. The refractory brick in the furnace shell should not be too thick, otherwise it will affect the heating depth of the smelting furnace, and the volume of the smelting furnace itself should not be too large; The temperature rise is very slow, the heating and heating of the furnace core will be relatively low, and the reactive power loss is also large, requiring a large amou...

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Problems solved by technology

[0002] Traditional high-, medium- and low-frequency melting furnaces all adopt hollow furnaces. The inside of the furnace shell is made of insulating refractory materials. There are no coils and magnets in the middle of the furnace. Water cables are used to supply coils outside the furnace shell of the furnace. The refractory brick in the furnace shell should not be too thick, otherwise it will affect the heating depth of the smelting furnace, and the volume of the smelting furnace itself should not be too large; The temperature rise is very slow, the heating and heating of the furnace core will be relatively low, and the reactive power loss is also large, requiring a large amount of capacitance compensation, and generating large harmonics, which seriously affects the production effect of the melting furnace, and the heating heat loss per unit of material is relatively large, and frequency The life of refractory materials for smelting furnace lining is short, and frequent furnace repairs increase the production cost of the enterprise; in the later stage of smelting, because the temperature of the material exceeds the Curie point, the temperature of the material rises slowly after paramagnetic, and the smelting loss is very large

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