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The heating method of the high-temperature resistance furnace and the type of electric furnace

  • Author:Zoe Jia
  • Release on:2024-01-18
High-temperature resistance furnaces can be divided into two categories: indirect heating and direct heating according to different heat generation methods. Indirect heating resistance furnace is a heating element made of special resistance material inside the furnace. When an electric current passes through the heating element, heat is generated, and then the charge placed in the furnace is heated through heat conduction, convection, and radiation. In the direct heating resistance furnace, the power supply is directly connected to the material to be heated, so that a strong current flows directly through the material to be heated and the material heats up by itself to achieve the heating effect. Most of the industrial resistance furnaces are indirectly heated, and only some are directly heated due to the special needs of the heating process.


The basic structure and type of high-temperature resistance heating furnace are developed with the development of the machinery industry, and the resistance furnace is a product with many varieties due to the needs of various heating processes and smelting processes. The structure of the resistance furnace body is divided into two types: periodic type and continuous type. Periodic work furnace. For example, box-type electric furnace, trolley-type electric furnace, pit electric furnace and other box-type electric furnaces, the shell is generally welded with section steel and steel plates, and the small electric furnace is generally made with a bracket because it needs to maintain a certain height of the working surface, and there are legs or brackets to support the furnace body under the box-type shell. Due to the large weight of the medium-sized electric furnace itself and the weight of the workpieces added to the furnace, the furnace body and bricks are generally welded directly on the chassis. Large electric furnaces can be designed as a structure without a rigid chassis on a specific dedicated foundation, and the bricks can be welded in situ, but this kind of electric furnace cannot be lifted and moved after installation.

The furnace door of small and medium-sized electric furnace can be opened and closed by counterweight and manual device, the lower part generally has a sand sealing groove, and some furnace doors are also equipped with a sand sealing groove on the upper side to ensure good sealing. Large electric furnace can be electric or pneumatic, hydraulic opening and closing of the furnace door, electric heating elements can generally be arranged on the left and right side walls and bottom surface of the furnace, in order to get a good thermal field, it is best to arrange electric heating elements on the top of the protective roof, because the height of the workpiece in the furnace will not exceed the width, so the above and lower two aspects of heating are more effective than the left and right two aspects. In order to ensure that the heat loss at the furnace door can be better balanced, 1/3 of the length of the furnace chamber can be used as a control area on the larger box-type electric furnace near the furnace door.
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