Composite heating type heat treatment furnace

Abstract

The invention discloses a composite heating type heat treatment furnace. The composite heating type heat treatment furnace comprises an induction coil arranged on the outer side of a furnace body andused for sensing a heated material and an electrode pair arranged in the furnace body as a secondary heating element, and the induction coil arranged at the outermost layer of a graphitizing furnace is used as a furnace shell. According to the composite heating type heat treatment furnace, by combining induction heating and electrode pair direct current heating, the heating effect is obviously improved, and meanwhile, the uniformity degree of material heating is improved.

Description

technical field [0001] The invention relates to a composite heating type heat treatment furnace, which belongs to the field of heat treatment furnaces. Background technique [0002] Most of the existing graphitization furnaces generate heat from the graphite body, and then transfer the heat to the heated material through radiation or heat transfer, which has high energy consumption and low efficiency; most intermediate frequency induction furnaces only transfer heat to the heating body through graphite crucible induction heating, There is a large temperature difference between the powder near the crucible and the powder in the middle. [0003] Chinese patent CN201010108189.8 discloses a vertical high-temperature continuous graphitization furnace. The upper and lower electrode pairs are connected to a DC power supply, and the material is used as a resistance to generate heat. The disadvantages are high energy consumption and low heating efficiency. Later, medium-frequency in...

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Problems solved by technology

[0002] Most of the existing graphitization furnaces generate heat from the graphite body, and then transfer the heat to the heated material through radiation or heat transfer, which has high energy consumption and low efficiency; most intermediate frequency induction furnaces only transfer heat to the heating body through graphite crucible induction heating, There is a large temperature difference between the powder near the crucible and the powder in the middle

[0003] Chinese patent CN201010108189.8 discloses a vertical high-temperature continuous graphitization furnace. The upper and lower electrode pairs are connected to a DC power supply, and the material is used as a resistance to generate heat. The disadvantages are high energy consumption and low heating efficiency.

Later, medium-frequency induction graphitization furnaces appeared, such as a vertical continuous induction high-temperature graphitization furnace disclosed in Chinese patent CN201410666556.4, an ultra-high temperature graphitization processing equipment disclosed in Chinese patent CN201410016297.0, and a Chinese patent CN201210487294.6 disclosed A continuous high-temperature graphite purification equipment, graphite purification and graphitization high-temperature vertical continuous induction heating furnace disclosed in Chinese patent CN200910042891.6, continuous vertical medium-frequency high-temperature high-purity graphite production equipment disclosed in Chinese patent CN200920009018.2, etc. It is characterized by high heating efficiency and low energy consumption, but the thermal conductivity of the powder is low, resulting in poor temperature uniformity of the materials in the furnace and uneven product performance, and these graphitization furnaces have a furnace shell structure and insulation layer, in addition to the need for furnace shell cooling water cooling, it also limits the size of the heating furnace, the replacement and maintenance of the insulation layer is time-consuming and labor-intensive, and mass production has not been realized in practice

[0004] The heating method of the existing induction heating furnace is to heat the graphite crucible through medium frequency induction, and then the heat is transferred from the crucible to the material through heat conduction, but the thermal conductivity of the material is low, which will cause the center and edge of the material close to the crucible There is a temperature difference, which eventually leads to uneven product performance; while the DC heating furnace requires a large current, high energy consumption, and low heating efficiency

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