Graphitization furnace

Abstract

The utility model provides a graphitization furnace and relates to the technical field of graphitization. The graphitization furnace comprises a furnace body, a heating resistance layer, an induction coil and a heating electrode pair; the furnace body is provided with a material chamber. The heating resistance layer is arranged on the inner side wall of the furnace body in the circumferential direction of the furnace body; the induction coil is arranged around the furnace body; the heating electrode pair is arranged on the inner periphery of the heating resistance layer. When the graphitization furnace operates, the to-be-graphitized material is contained in the material chamber. The induction coil is electrified, so that the heating resistance layer is inductively heated, and the to-be-graphitized material is heated. Meanwhile, a heating electrode pair arranged on the inner periphery of the heating resistance layer is electrified, so that the to-be-graphitized material passing through the heating electrode pair generates current, the electric energy is continuously converted into internal energy, and the temperature of the to-be-graphitized material is increased. According to the graphitization furnace, the to-be-graphitized material is heated in an electromagnetic induction heating mode and an electric heating mode at the same time, the to-be-graphitized material can be evenly heated, and therefore the performance uniformity of a product obtained through graphitization treatment is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of graphitization, in particular to a graphitization furnace. Background Art

[0002] Graphitization refers to the process of converting carbon products with other crystal structures into graphite crystal structures. Generally, graphitization is a high-temperature heat treatment process in which carbon products are heated to above 2300°C in a high-temperature electric furnace to convert amorphous chaotic layer carbon into a three-dimensional ordered graphite crystalline structure.

[0003] Graphitized carbon materials obtained through graphitization have broad application prospects in the fields of steel smelting, lithium-ion batteries and nuclear industry. Taking lithium-ion batteries as an example, graphitization can improve the volume density, electrical conductivity, thermal conductivity, corrosion resistance and mechanical processing performance of the product, and is a key process in the production of artificial graphite negative electrodes.

[0004] However, the existing graphitization equipment has a single heating method, which easily leads to uneven heating of the material, thus affecting the uniformity of product performance. Utility Model Content

[0005] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide a graphitization furnace.

[0006] The utility model provides the following technical solutions:

[0007] A graphitization furnace, comprising:

[0008] A furnace body having a material chamber;

[0009] A heating resistor layer is arranged on the inner wall of the furnace body along the circumference of the furnace body;

[0010] an induction coil, arranged around the furnace body; and

[0011] The heating electrode pair is arranged inside the heating resistor layer.

[0012] As a further optional solution for the graphitization furnace, the graphitization furnace further includes a feeding device, and the feeding device includes a feeding pipe and a first screw conveying mechanism;

[0013] One end of the feed pipe is connected to the top of the furnace body, and the tube cavity of the feed pipe is connected to the material chamber, and the first spiral conveying mechanism is arranged in the feed pipe.

[0014] As a further optional solution for the graphitization furnace, the feeding device further comprises a feeding hopper, and the feeding hopper is connected to an end of the feeding pipe away from the furnace body.

[0015] As a further optional solution for the graphitization furnace, the side wall of the feed pipe is connected to a protective gas pipe for injecting protective gas, and the furnace body is connected to an exhaust pipe.

[0016] As a further optional solution for the graphitization furnace, a plurality of the feeding devices are provided, and the feeding pipes of the plurality of the feeding devices are evenly distributed on the top end surface of the furnace body.

[0017] As a further optional solution for the graphitization furnace, the graphitization furnace further includes a discharging device, and the discharging device includes a discharging pipe and a second screw conveying mechanism;

[0018] One end of the discharge pipe is connected to the bottom end of the furnace body, and the tube cavity of the discharge pipe is connected to the material chamber, and the second spiral conveying mechanism is arranged in the discharge pipe.

[0019] As a further optional solution for the graphitization furnace, the discharge device further includes a cooling jacket, which is sleeved on the discharge pipe, and a cooling channel for a refrigerant to flow through is formed between the cooling jacket and the discharge pipe.

[0020] As a further optional solution for the graphitization furnace, the discharge device is provided with a plurality of discharge pipes, and the discharge pipes of the plurality of discharge devices are evenly distributed on the bottom end surface of the furnace body;

[0021] The graphitization furnace further includes a discharge hopper, which is respectively connected to one end of the plurality of discharge pipes away from the furnace body.

[0022] As a further optional solution for the graphitization furnace, the heating resistor layer is a graphite lining.

[0023] As a further optional solution for the graphitization furnace, the heating electrode pair includes a first electrode and a second electrode, the first electrode is located at one end of the material chamber along the first direction, and the second electrode is located at the other end of the material chamber along the first direction;

[0024] Wherein, the first direction is a horizontal direction.

[0025] The embodiments of the present invention have the following beneficial effects:

[0026] When the graphitization furnace is in operation, the material to be graphitized is placed in the material chamber. The induction coil is energized, so that the heating resistor layer is induced to heat and heat the material to be graphitized. At the same time, the heating electrode pair arranged inside the heating resistor layer is energized, so that the material to be graphitized passing through the heating electrode pair generates current and continuously converts electrical energy into internal energy, so that its own temperature rises. The graphitization furnace uses electromagnetic induction heating and electric heating to heat the material to be graphitized at the same time, which can make the material to be graphitized be heated evenly, so that the performance uniformity of the product obtained after graphitization treatment is higher.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 The overall structural diagram of a graphitization furnace provided by an embodiment of the utility model is shown;

[0030] Figure 2 A schematic structural diagram of a feeding device in a graphitization furnace provided by an embodiment of the utility model is shown;

[0031] Figure 3 A schematic structural diagram of a discharge device in a graphitization furnace provided in an embodiment of the utility model is shown.

[0032] Description of main component symbols:

[0033] 100-furnace body; 101-material chamber; 110-exhaust pipe; 200-heating resistor layer; 300-induction coil; 400-heating electrode pair; 410-first electrode; 420-second electrode; 500-feeding device; 510-feeding pipe; 511-protective air pipe; 520-first spiral conveying mechanism; 521-first rotating shaft; 522-first spiral blade; 530-feeding hopper; 600-discharging device; 610-discharging pipe; 620-second spiral conveying mechanism; 621-second rotating shaft; 622-second spiral blade; 630-cooling jacket; 700-discharging hopper. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] Example

[0040] See also Figure 1 This embodiment provides a graphitization furnace, specifically a continuous induction graphitization furnace, which includes a furnace body 100, a heating resistor layer 200, an induction coil 300 and a heating electrode pair 400.

[0041] The furnace body 100 has a material chamber 101, and the material chamber 101 is used to accommodate the material to be graphitized.

[0042] The heating resistor layer 200 is located in the material chamber 101 , and the heating resistor layer 200 is disposed on the inner wall of the furnace body 100 along the circumferential direction of the furnace body 100 .

[0043] The induction coil 300 is disposed around the furnace body 100 and cooperates with the heating resistor layer 200 to perform electromagnetic induction heating on the graphitized material.

[0044] The heating electrode pair 400 is located in the material chamber 101 , and the heating electrode pair 400 is arranged inside the heating resistor layer 200 to electrically heat the material to be graphitized.

[0045] When the graphitization furnace is in operation, the material to be graphitized is placed in the material chamber 101. The induction coil 300 is energized, so that the heating resistor layer 200 is induced to generate heat, and the material to be graphitized is heated. At the same time, the heating electrode pair 400 arranged inside the heating resistor layer 200 is energized, so that the material to be graphitized passing through the heating electrode pair 400 generates current, and continuously converts electrical energy into internal energy, so that its own temperature rises. The graphitization furnace adopts electromagnetic induction heating and electric heating to heat the material to be graphitized at the same time, which can make the material to be graphitized be heated evenly, so that the performance uniformity of the product obtained after graphitization treatment is higher.

[0046] Specifically, the heating resistor layer 200 is a graphite lining.

[0047] The graphite lining is provided in a cylindrical shape and fits with the inner wall of the furnace body 100 . The length of the graphite lining along its own axis direction is equal to the height of the material chamber 101 .

[0048] Specifically, the heating electrode pair 400 includes a first electrode 410 and a second electrode 420. One of the first electrode 410 and the second electrode 420 is a positive electrode, and the other is a negative electrode. In addition, the first electrode 410 is located at one end of the material chamber 101 along the first direction, and the second electrode 420 is located at the other end of the material chamber 101 along the first direction.

[0049] The first direction is a horizontal direction, which is indicated by the X direction in the figure.

[0050] After the heating electrode pair 400 is powered on, an electric field is formed between the first electrode 410 and the second electrode 420, so that the material to be graphitized between the first electrode 410 and the second electrode 420 generates current and continuously converts electrical energy into internal energy, thereby increasing its own temperature.

[0051] Exemplarily, the first electrode 410 is a positive electrode, and the second electrode 420 is a negative electrode.

[0052] In some embodiments, the first electrode 410 and the second electrode 420 are both columnar electrodes, and the first electrode 410 and the second electrode 420 are both vertically disposed.

[0053] Please combine Figure 2 In some embodiments, the graphitization furnace further includes a feeding device 500 , and the feeding device 500 includes a feeding pipe 510 and a first screw conveying mechanism 520 .

[0054] The feed pipe 510 is vertically arranged, the bottom end of the feed pipe 510 is connected to the top end of the furnace body 100 , and the tube cavity of the feed pipe 510 is connected to the material chamber 101 .

[0055] Correspondingly, the first screw conveying mechanism 520 is disposed in the feeding pipe 510 .

[0056] When in use, the material to be graphitized enters the feed pipe 510, and the first screw conveying mechanism 520 continuously feeds the material to be graphitized in the feed pipe 510 into the material chamber 101, thereby realizing continuous feeding of the material to be graphitized, and the feeding speed is controllable.

[0057] Specifically, the first spiral conveying mechanism 520 is composed of a first rotating shaft 521 and a first spiral blade 522 .

[0058] The first rotating shaft 521 is rotatably disposed in the feed pipe 510, and the axis of the first rotating shaft 521 coincides with the axis of the feed pipe 510. The first spiral blade 522 is spirally wound around the first rotating shaft 521, rotates with the first rotating shaft 521, and pushes the graphitized material into the material chamber 101 during the rotation process.

[0059] Furthermore, a protective gas pipe 511 for injecting protective gas is connected to the side wall of the feed pipe 510 , and an exhaust pipe 110 is connected to the furnace body 100 .

[0060] When in use, the protective gas is injected into the protective gas pipe 511, and the protective gas enters the feed pipe 510. A part of the protective gas is discharged from the end of the feed pipe 510 away from the furnace body 100, and the other part of the protective gas enters the material chamber 101 and is discharged from the exhaust pipe 110 on the furnace body 100.

[0061] At this time, a slightly positive pressure environment is formed in the feed pipe 510 and the furnace body 100, which can prevent the outside air from entering, thereby making the material to be graphitized less likely to be oxidized.

[0062] Optionally, the protective gas is argon, and the flow rate of the argon is Q, satisfying 0.5m3 / h≤Q≤5m3 / h.

[0063] Alternatively, Q may be 0.5 m3 / h, 1 m3 / h, 1.5 m3 / h, 2 m3 / h, 2.5 m3 / h, 3 m3 / h, 3.5 m3 / h, 4 m3 / h, 4.5 m3 / h, 5 m3 / h, or any value between 0.5 m3 / h and 5 m3 / h.

[0064] Furthermore, the feeding device 500 also includes a feeding hopper 530 , and the feeding hopper 530 is connected to the top end of the feeding pipe 510 .

[0065] The feed hopper 530 can guide the material to be graphitized into the feed pipe 510 and can store a certain amount of the material to be graphitized to avoid interruption of the feeding process of the material to be graphitized.

[0066] In some embodiments, a plurality of feeding devices 500 are provided, and the feeding pipes 510 of the plurality of feeding devices 500 are evenly distributed on the top end surface of the furnace body 100 .

[0067] The user can choose to use different numbers of feeding devices 500 to feed materials and adjust the feeding speed of the material to be graphitized, or can choose to use feeding devices 500 at different positions to feed materials so that the material to be graphitized can be better heated.

[0068] Please combine Figure 3 In some embodiments, the graphitization furnace further includes a discharge device 600 , and the discharge device 600 includes a discharge pipe 610 and a second spiral conveying mechanism 620 .

[0069] The discharge pipe 610 is vertically arranged, the top end of the discharge pipe 610 is connected to the bottom end of the furnace body 100 , and the tube cavity of the discharge pipe 610 is connected to the material chamber 101 .

[0070] Correspondingly, the second spiral conveying mechanism 620 is disposed in the discharge pipe 610 .

[0071] When in use, the product obtained after graphitization treatment falls into the discharge pipe 610 from the bottom of the material chamber 101, and the second spiral conveying mechanism 620 discharges the product in the discharge pipe 610, thereby realizing continuous discharge of the product, which is compatible with the continuous feeding of the material to be graphitized, and the discharge speed is controllable.

[0072] Specifically, the second spiral conveying mechanism 620 is composed of a second rotating shaft 621 and a second spiral blade 622 .

[0073] The second rotating shaft 621 is rotatably disposed in the discharge pipe 610, and the axis of the second rotating shaft 621 coincides with the axis of the discharge pipe 610. The second spiral blade 622 is spirally wound around the second rotating shaft 621, rotates with the second rotating shaft 621, and pushes the product out of the discharge pipe 610 during the rotation process.

[0074] Furthermore, the discharge device 600 further includes a cooling jacket 630. The cooling jacket 630 is sleeved on the discharge pipe 610, and a cooling channel is formed between the cooling jacket 630 and the discharge pipe 610 for the coolant to flow through.

[0075] When in use, the refrigerant is allowed to flow continuously in the cooling channel, which can absorb the heat of the product in the feed pipe 510 and accelerate the cooling speed of the product so that the product can be discharged in time.

[0076] In some embodiments, a plurality of discharge devices 600 are provided, and the discharge pipes 610 of the plurality of discharge devices 600 are evenly distributed on the bottom end surface of the furnace body 100 to achieve uniform discharge.

[0077] Correspondingly, the graphitization furnace further includes a discharge hopper 700 , and the top end of the discharge hopper 700 is connected to the bottom ends of the plurality of discharge pipes 610 .

[0078] The products discharged through the multiple discharge pipes 610 are gathered in the discharge hopper 700 and then discharged from the bottom end of the discharge hopper 700 for further bagging.

[0079] In summary, when the graphitization furnace is in operation, the feeding device 500 continuously feeds the material to be graphitized into the material chamber 101. The induction coil 300 is energized to make the heating resistor layer 200 inductively heat and heat the material to be graphitized. At the same time, the heating electrode pair 400 arranged inside the heating resistor layer 200 is energized, so that the material to be graphitized passing through the heating electrode pair 400 generates current and continuously converts electrical energy into internal energy to increase its own temperature. Finally, the product obtained after graphitization is continuously discharged to the discharge hopper 700 through the discharge device 600.

[0080] The graphitization furnace adopts electromagnetic induction heating and electric heating to heat the material to be graphitized at the same time, so that the material to be graphitized can be heated evenly, thereby making the performance uniformity of the product obtained after graphitization treatment higher.

[0081] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0082] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0083] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A graphitization furnace, characterized in that: include: A furnace body having a material chamber; A heating resistor layer is arranged on the inner wall of the furnace body along the circumference of the furnace body; An induction coil is arranged around the furnace body; as well as The heating electrode pair is arranged inside the heating resistor layer.

2. The graphitization furnace according to claim 1, characterized in that: The graphitization furnace further includes a feeding device, which includes a feeding pipe and a first screw conveying mechanism; One end of the feed pipe is connected to the top of the furnace body, and the tube cavity of the feed pipe is connected to the material chamber, and the first spiral conveying mechanism is arranged in the feed pipe.

3. The graphitization furnace according to claim 2, characterized in that: The feeding device further comprises a feeding hopper, and the feeding hopper is connected to an end of the feeding pipe away from the furnace body.

4. The graphitization furnace according to claim 2, characterized in that: The side wall of the feed pipe is connected with a protective gas pipe for injecting protective gas, and the furnace body is connected with an exhaust pipe.

5. The graphitization furnace according to claim 2, 3 or 4, characterized in that: The feeding devices are provided in plurality, and the feeding pipes of the plurality of feeding devices are evenly distributed on the top end surface of the furnace body.

6. The graphitization furnace according to claim 1, characterized in that: The graphitization furnace further includes a discharging device, which includes a discharging pipe and a second screw conveying mechanism; One end of the discharge pipe is connected to the bottom end of the furnace body, and the tube cavity of the discharge pipe is connected to the material chamber, and the second spiral conveying mechanism is arranged in the discharge pipe.

7. The graphitization furnace according to claim 6, characterized in that: The discharge device further comprises a cooling jacket, which is sleeved on the discharge pipe, and a cooling channel for a refrigerant to flow through is formed between the cooling jacket and the discharge pipe.

8. The graphitization furnace according to claim 6, characterized in that: The discharging device is provided in plurality, and the discharging pipes of the plurality of discharging devices are evenly distributed on the bottom end surface of the furnace body; The graphitization furnace further includes a discharge hopper, which is respectively connected to one end of the plurality of discharge pipes away from the furnace body.

9. The graphitization furnace according to claim 1, characterized in that: The heating resistor layer is a graphite lining.

10. The graphitization furnace according to claim 1, characterized in that: The heating electrode pair includes a first electrode and a second electrode, the first electrode is located at one end of the material chamber along a first direction, and the second electrode is located at the other end of the material chamber along the first direction; Wherein, the first direction is a horizontal direction.

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