CN107655333B - Composite heating type heat treatment furnace - Google Patents
Composite heating type heat treatment furnace Download PDFInfo
- Publication number
- CN107655333B CN107655333B CN201610594942.6A CN201610594942A CN107655333B CN 107655333 B CN107655333 B CN 107655333B CN 201610594942 A CN201610594942 A CN 201610594942A CN 107655333 B CN107655333 B CN 107655333B
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- induction coil
- electrode
- heat treatment
- heating
- treatment furnace
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details specially adapted for crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/06—Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D27/00—Stirring devices for molten material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/22—Furnaces without an endless core
- H05B6/24—Crucible furnaces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/04—Carbon-containing material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Carbon And Carbon Compounds (AREA)
- General Induction Heating (AREA)
Abstract
The application discloses a composite heating type heat treatment furnace. The composite heating type heat treatment furnace comprises an induction coil arranged outside a furnace body and used for inductively heating materials, and an electrode pair which is arranged in the furnace body and used as a secondary heating element; the induction coil arranged on the outermost layer of the graphitizing furnace also serves as a furnace shell. The application combines induction heating and electrode pair direct current heating, thereby obviously improving the heating effect and improving the uniformity of material heating.
Description
Technical Field
The application relates to a composite heating type heat treatment furnace, and belongs to the field of heat treatment furnaces.
Background
Most of the existing graphitizing furnaces generate heat by graphite bodies, and then the heat is transmitted to the heated material in a radiation or heat transfer mode, so that the energy consumption is high and the efficiency is low; most medium frequency induction furnaces only transfer heat to a heating body through graphite crucible induction heating, and a large temperature difference exists between powder close to the crucible and powder located in the middle.
Chinese patent CN201010108189.8 discloses a vertical high-temperature continuous graphitizing furnace, which uses upper and lower electrode pairs connected with a dc power supply and uses materials as resistors to generate heat, and has the disadvantages of high energy consumption and low heating efficiency. The medium frequency induction graphitizing furnace, such as a vertical continuous induction high temperature graphitizing furnace disclosed in China patent CN201410666556.4, an ultra-high temperature graphitizing treatment device disclosed in China patent CN201410016297.0, a continuous high temperature graphite purifying device disclosed in China patent CN201210487294.6, a graphite purifying and graphitizing high temperature vertical continuous induction heating furnace disclosed in China patent CN200910042891.6, a continuous vertical medium frequency high temperature high purity graphite production device disclosed in China patent CN200920009018.2 and the like, is characterized by high heating efficiency and low energy consumption, but has lower heat conductivity coefficient of powder, thereby causing poor temperature uniformity of materials in the furnace, uneven performance of products, and the graphitizing furnaces are provided with furnace shell structures and heat preservation layers, besides the need of furnace shell cooling water cooling, the volume of the heating furnace is limited, the heat preservation layer is replaced, maintenance is time-consuming and labor-consuming, and mass production is not realized in practice.
The existing induction heating furnace heats the graphite crucible through medium frequency induction, and then heat is transferred to materials from the crucible through heat conduction, but the heat conductivity coefficient of the materials is lower, so that the temperature difference exists between the materials at the center and the edge close to the crucible, and finally uneven product performance is caused; and the direct current heating furnace needs large current, and has high energy consumption and low heating efficiency.
Disclosure of Invention
The application aims to provide a composite heating type heat treatment furnace, which combines an intermediate frequency induction heating technology and a direct current heating technology, so that the energy consumption is saved, the temperature uniformity of a heating material is improved, and the heating effect is better.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
the composite heating heat treatment furnace is structurally characterized by comprising an induction coil arranged outside a furnace body and used for inductively heating materials, and an electrode pair which is arranged in the furnace body and used as a secondary heating element; the induction coil arranged on the outermost layer of the graphitizing furnace also serves as a furnace shell.
Therefore, the application adopts the combination of induction heating and direct current heating of the electrode, thereby obviously improving the heating effect, improving the uniformity of material heating, mutually compensating the temperature, and enabling the highest temperature to reach 3100 ℃. In addition, the induction coil is used as an outer layer furnace shell, the traditional metal furnace shell is not arranged any more, the size of the furnace body is not limited by the metal furnace shell, the volume of the metal furnace shell can be reduced, the diameter of the furnace shell is generally 1.2-1.8 times of that of a heating coil, the occupied area is reduced, the manufacturing cost and the cooling cost of the metal furnace shell can be saved, the induction coil is used as a heat-insulating material by utilizing the characteristic that the heat conductivity of powder materials is poor, and meanwhile, the induction coil can penetrate through a non-conductor to directly heat the powder materials, so that the heating efficiency of the graphitization furnace is greatly improved, the production cost is reduced, and the graphitization furnace is convenient for mass production.
According to the embodiment of the application, the application can be further optimized, and the following technical scheme is formed after the optimization:
the induction coil is an encapsulated induction coil; preferably the induction coil has a diameter of 0.5m to 10m, more preferably 1m to 3m; preferably, the upper part of the induction coil is a support body formed by pouring materials, and the lower part of the induction coil is a poured hollow induction coil.
A rotating disc is arranged at the top of the induction coil, and a rotating shaft, an electrode and a feed inlet are arranged on the rotating disc; a plate electrode is arranged at the bottom of the induction coil, and a discharge hole connected with the cooling area is arranged in the middle of the plate electrode; the electrode pair is formed between the electrode and the plate electrode, so that the electrode is heated by the induction coil to form a heating element while the electrode pair forms a secondary heating element (the induction heating element is high in heating efficiency, low in energy consumption, free of low-voltage high current, free of low-voltage rectification, low in production cost, and capable of reducing the consumption of copper loss and iron loss of the transformer, improving the electric heating efficiency by 50%), further improving the area of a heating area, further improving the temperature in the furnace, and improving the heating efficiency.
The edge part of the rotating disc is supported by an induction coil; the electrode penetrates through and is fixed on the rotating disc, and the plate electrode and the induction coil form a crucible for containing heating materials. Preferably, the electrode is provided with an adjusting structure for adjusting the length of the electrode extending into the induction coil; more preferably the adjustment structure is a rotary structure or a threaded structure.
The number of the electrodes is not less than 2, and the electrodes are uniformly distributed along the central line of the rotating disc; preferably the electrodes are located at a distance of 50-500mm from the inner wall of the induction coil.
In order to facilitate the rapid overflow of the impurity gas during heating, the middle part of the electrode is provided with a through hole structure which is used as an exhaust channel and a temperature measuring channel; the lower part of the electrode is preferably provided with uniformly distributed inclined holes from outside to inside.
In order to realize the stirring effect on the materials when the electrodes rotate and to ensure that the heating process of the materials is more uniform, the rotating shaft is connected with the driving device to form a rotating element to drive the rotating disc to rotate; preferably, the rotation speed of the rotating shaft is not higher than 6r/min, preferably 0 r/min-3r/min. Thus, the electrode is driven to rotate by the driving device, and the material is stirred during heating.
The heat treatment furnace is a graphitizing furnace without a furnace shell, and materials arranged in the inner wall area of the induction coil also serve as an inner heat insulation layer.
The current frequency of the induction coil is 350-3000HZ, and the heating power is 500-2000kW.
The electrode comprises at least one electrode group, each electrode group is provided with three electrodes, and the three electrodes of each electrode group are respectively connected with ABC three phases of three-phase electricity to form an electrode heating zone between the three electrodes; preferably, the electrode heating zone is located at an upper portion of the induction coil heating zone.
Compared with the prior art, the application has the beneficial effects that:
1. achieving higher temperatures; the two heating modes work simultaneously, the temperatures are mutually compensated, the better temperature can be obtained, and the highest temperature can reach 3100 ℃. Through the composite heating of the front section and the rear section, the beneficial compensation of always maintaining the high temperature section of the hearth can be realized when the temperature of the current section is insufficient or the power of the heating electrode is reduced.
2. Different temperature distributions are realized; different temperature distribution in the hearth is realized by adjusting the current of the electrode and the power of the induction heating power supply.
3. The temperature uniformity is better; the electrode heating can compensate the temperature difference between the center and the edge caused by heat conduction, and meanwhile, the temperature difference caused by poor heat preservation effect of the top and the bottom of the hearth is compensated, so that the temperature uniformity is improved.
4. The furnace has no metal furnace shell, is not limited by the size of the furnace shell, has no limitation on the size of the furnace body, has the diameter of a heating zone of 2-10m which is 2-6 times that of a traditional induction furnace, has high single-furnace treatment yield, and is more suitable for mass production; in addition, no furnace shell and cooling water are provided, so that the danger caused by water leakage is avoided, and meanwhile, the energy consumption of a cooling water system is saved.
5. The traditional carbon felt heat preservation layer is abandoned, the characteristics of small granularity, small bulk specific gravity and low heat transfer efficiency of the cathode material are utilized, and powder is directly used as the heat preservation material, so that heat loss caused by outward heat transfer is avoided, the overall heat efficiency is improved, and the maintenance cost caused by the heat preservation material is reduced.
6. The multi-electrode directly heats the material and is also heated by induction, and is used as a heat source to heat the powder material at the same time, so that the high temperature area is enlarged to 4-5 times of the original area, and the powder material is more uniform.
Drawings
Fig. 1 is a schematic diagram of the structure of an embodiment of the present application.
Detailed Description
The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" are used hereinafter to denote only the directions corresponding to the upper, lower, left, and right directions of the drawings, and do not limit the structure.
A composite heating type heat treatment furnace is shown in figure 1, and comprises a packaged induction coil 4 which is used for inductively heating materials outside a furnace body and an electrode pair which is used as a secondary heating element. The graphitizing furnace is a graphitizing furnace without a furnace shell, the induction coil 4 arranged on the outermost layer of the graphitizing furnace is also used as a furnace shell, and the material arranged in the inner wall area of the induction coil 4 is also used as an inner heat-insulating layer. The upper part of the induction coil 4 is a support body formed by pouring materials, the lower part of the induction coil is a poured hollow induction coil, and the induction coil 4 is formed by the two induction coils together.
The upper part of the induction coil 4 is provided with a rotating disc 2, the rotating disc 2 is provided with a rotating shaft 1, an electrode 3 and a feed inlet 5, the bottom of the induction coil 4 is also provided with a plate electrode 7, a discharge outlet 6 is arranged in the middle of the plate electrode 7, and the discharge outlet 6 is connected with a cooling zone 8; the electrode pair is formed between the electrode 3 and the plate electrode 7, and the induction heating formed by the electrode pair and the induction coil 4 forms composite heating; the edge part of the rotating disc 2 is supported by an induction coil 4; the electrode 7 penetrates through and is fixed on the rotating disc 2, and the length of the electrode 7 extending into the induction coil 4 can be adjusted through rotation or threads; the plate electrode 7 and the induction coil 4 form a crucible for holding the heated material.
The number of the electrodes 3 is not less than 2, and the electrodes are uniformly distributed along the central line of the rotating disc 2; the distance between the electrode 3 and the inner wall of the induction coil 4 is 50-500mm; the middle part of the electrode 3 is of a through hole structure, and the through hole structure is used as an exhaust channel and a temperature measuring channel, and preferably, the electrode 3 is simultaneously provided with uniformly distributed inclined holes from outside to inside, so that impurities are more easily discharged.
The rotating shaft 1 is connected with a driving device to form a rotating element to drive the rotating disc 2 to rotate, so that the stirring function of the electrode 3 is realized; preferably, the rotation shaft 1 is preferably 0 r/min-3r/min.
The induction coil 4 preferably has a diameter of 1m-3m.
The current frequency of the induction coil is 350-3000HZ, and the heating power is 500-2000kW.
As a preferred solution, when the number of electrodes 3 is a multiple of 3 (minimum 1 group), the 3 electrodes connected may be formed into an electrode group, and the three electrodes of each electrode group are respectively connected with ABC three phases of the three-phase power, i.e. one electrode is connected with a phase a, one electrode is connected with a phase B, and one electrode is connected with a phase C, so that a heating zone is formed between the three electrodes of one motor group. The electrode heating zone is positioned at the upper part of the induction heating zone to form composite heating.
The foregoing examples are set forth in order to provide a more thorough description of the present application and are not intended to limit the scope of the application, and various modifications of the application, which are equivalent to those skilled in the art upon reading the present application, will fall within the scope of the application as defined in the appended claims.
Claims (17)
1. The composite heating heat treatment furnace is characterized by comprising an induction coil (4) arranged outside a furnace body and used for inductively heating materials, and an electrode pair which is arranged in the furnace body and used as a secondary heating element; the induction coil (4) arranged on the outermost layer of the graphitizing furnace is also used as a furnace shell, a rotating disc (2) is arranged at the top of the induction coil (4), and a rotating shaft (1), an electrode (3) and a feed inlet (5) are arranged on the rotating disc (2); a plate electrode (7) is arranged at the bottom of the induction coil (4), and a discharge hole (6) connected with a cooling area (8) is arranged in the middle of the plate electrode (7); the electrode pair is formed between the electrode (3) and the plate electrode (7), and the rotating shaft (1) is connected with the driving device to form a rotating element to drive the rotating disc (2) to rotate;
the upper part of the induction coil (4) is a support body formed by pouring materials, and the lower part of the induction coil is a poured hollow induction coil.
2. A composite heated heat treatment furnace according to claim 1, characterised in that the induction coil (4) is an encapsulated induction coil.
3. A composite heated heat treatment furnace according to claim 2, characterised in that the induction coil (4) has a diameter of 0.5m-10m.
4. A composite heated heat treatment furnace according to claim 2, characterised in that the induction coil (4) has a diameter of 1m-3m.
5. The composite heating heat treatment furnace according to claim 1, wherein the edge portion of the rotary disk (2) is supported by an induction coil (4); the electrode (3) penetrates through and is fixed on the rotating disc (2), and the plate electrode (7) and the induction coil (4) form a crucible for containing heating materials.
6. The composite heating heat treatment furnace according to claim 5, wherein the electrode (3) is provided with an adjusting structure for adjusting the length of the electrode (3) extending into the induction coil (4).
7. The composite heated heat treating furnace of claim 6, wherein the adjustment structure is a rotary structure or a screw structure.
8. The composite heating heat treatment furnace according to claim 1, wherein the number of the electrodes (3) is not less than 2, and is uniformly distributed along the center line of the rotary disk (2).
9. A composite heated heat treatment furnace according to claim 8, characterised in that the electrode (3) is at a distance of 50-500mm from the inner wall of the induction coil (4).
10. The composite heating heat treatment furnace according to claim 1, wherein the middle part of the electrode (3) is a through hole structure which serves as both an exhaust passage and a temperature measurement passage.
11. A composite heating heat treatment furnace according to claim 10, wherein the lower part of the electrode (3) is provided with uniformly distributed inclined openings from outside to inside.
12. A composite heated heat treatment furnace according to claim 1, characterised in that the rotational speed of the rotational shaft (1) is not higher than 6r/min.
13. The composite heated heat treatment furnace according to claim 12, wherein the rotational speed of the rotational shaft (1) is 0 r/min-3r/min.
14. The composite heating heat treatment furnace according to claim 1, wherein the heat treatment furnace is a shell-less graphitization furnace, and the material provided in the inner wall area of the induction coil (4) also serves as an inner heat insulating layer.
15. The composite heated heat treating furnace according to any one of claims 1 to 14, wherein the current frequency of the induction coil is 350 to 3000HZ and the heating power is 500 to 2000kW.
16. A composite heated heat treatment furnace according to any of claims 1-14, wherein the electrodes (3) comprise at least one electrode group, each electrode group having three electrodes, the three electrodes of each electrode group being connected to three phases ABC of a three-phase electricity respectively to form an electrode heating zone between the three electrodes.
17. The composite heated heat treating furnace according to claim 16, wherein the electrode heating zone is located at an upper portion of the induction coil heating zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610594942.6A CN107655333B (en) | 2016-07-26 | 2016-07-26 | Composite heating type heat treatment furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610594942.6A CN107655333B (en) | 2016-07-26 | 2016-07-26 | Composite heating type heat treatment furnace |
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| CN107655333A CN107655333A (en) | 2018-02-02 |
| CN107655333B true CN107655333B (en) | 2023-12-05 |
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| CN201610594942.6A Active CN107655333B (en) | 2016-07-26 | 2016-07-26 | Composite heating type heat treatment furnace |
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| CN109708469A (en) * | 2018-12-28 | 2019-05-03 | 王治军 | A kind of aluminium bronze undercurrent type smelting furnace of air-pressure guide |
| CN110671934B (en) * | 2019-10-09 | 2021-12-28 | 西藏克瑞斯科技有限公司 | Multi-chamber shaft furnace type intermediate frequency furnace |
| CN111442647A (en) * | 2020-04-30 | 2020-07-24 | 安徽汇科新能源有限责任公司 | Crucible for graphitizing furnace for high-temperature purification of negative electrode material |
| CN114040522A (en) * | 2021-11-05 | 2022-02-11 | 中国电子科技集团公司第四十八研究所 | Semiconductor equipment heating device |
| CN114234652B (en) * | 2021-12-03 | 2023-07-21 | 汨罗市鑫祥碳素制品有限公司 | Secondary heating type vertical graphite furnace |
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| CN104724702A (en) * | 2015-04-16 | 2015-06-24 | 新郑市东升炭素有限公司 | Double-section graphitization furnace equipment and production process |
| CN205029900U (en) * | 2015-10-19 | 2016-02-10 | 株洲晨昕中高频设备有限公司 | High temperature is induction coil for graphitizing furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011061847A1 (en) * | 2009-11-20 | 2011-05-26 | Kaneko Kyojiro | Electromagnetic casting apparatus for silicon |
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| US3684446A (en) * | 1970-02-24 | 1972-08-15 | Superior Graphite Co | Method for high-temperature treatment of petroleum coke |
| GB1317144A (en) * | 1970-02-24 | 1973-05-16 | Superior Graphite Co | Method and apparatus for high-temperature treatment of petroleum coke |
| JPS55138036A (en) * | 1979-04-13 | 1980-10-28 | Hitachi Chem Co Ltd | Production of graphite-dispersed alloy |
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