Graphitization large box furnace

Abstract

The utility model discloses a large graphitization box furnace, which comprises an outer furnace body, a box furnace and a furnace cover, the box furnace is arranged in the outer furnace body, the furnace cover is arranged on the top of the outer furnace body, coke powder is filled in the box furnace, more than two heating cores are arranged in the box furnace, the end parts of the heating cores are sequentially and mutually lapped to form electric connection, and the heating cores are arranged in the outer furnace body. The heating core located at the tail end sequentially penetrates through the box furnace and the side vertical wall of the end of the outer furnace body. By arranging the heating cores which are in lap joint with each other, the heating cores can adaptively move during heating and when coke powder is heated to expand, the situation that the heating cores are broken to affect heating is avoided, and further, by arranging a limiting plate, the stability of mutual connection of the heating cores can be guaranteed; and the plurality of heating cores are overlapped, so that the manufacturing length of a single heating core can be shortened, and the manufacturing and transportation cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of graphitization technology. Specifically, it relates to a large graphitization furnace. Background Technology

[0002] With the development of the new energy industry, the demand for energy storage materials is constantly increasing. Among them, graphitization of anode materials is usually carried out in graphitization furnace. The battery cell generates heat when energized, which heats the coke powder in the graphitization furnace. As the demand for anode materials increases, the volume of graphitization furnace is also increasing. However, during the heating process, the coke powder may expand or contract under the influence of temperature. The battery cell arranged in the coke powder is subjected to the pressure of the coke powder, which may cause bending, tilting, or even cracking and breaking, affecting the heating stability. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide a graphitization large box furnace that improves single-batch output and heating stability.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a graphitization box furnace, including an outer furnace body, a box furnace, and a furnace cover. The box furnace is disposed inside the outer furnace body, and the furnace cover is disposed on the top of the outer furnace body. Coke powder is loaded in the box furnace. Two or more heating cores are disposed in the box furnace. The ends of the heating cores are sequentially overlapped to form an electrical connection. The heating core located at the end sequentially passes through the side walls of the box furnace and the end of the outer furnace body.

[0005] In the aforementioned graphitization furnace, a first carbon black layer is laid flat on the inner bottom wall of the outer furnace body, a first calcined heat-insulating material layer is laid flat on the surface of the first carbon black layer, a first calcined resistance material layer is laid flat on the surface of the first calcined heat-insulating material layer, and the bottom of the furnace is attached to the surface of the first calcined resistance material layer.

[0006] In the aforementioned graphitization furnace, the thickness of the first carbon black layer is 0.11 to 1.03 times the height of the outer furnace body; the thickness of the first post-calcination insulation layer is 0.02 to 0.04 times the height of the outer furnace body; and the thickness of the first post-calcination resistance layer is 0.01 to 0.03 times the height of the outer furnace body.

[0007] In the aforementioned graphitization furnace, a second carbon black layer is filled between the opposite side walls of the outer furnace body and the side walls of the furnace box. The second carbon black layer is pressed onto the surface of the first calcined resistance material layer. A second calcined insulation material layer is attached to the top of the second carbon black layer, and the top of the second calcined insulation material layer is attached to the furnace cover. Graphitized carbon cloth is laid between the side walls of the furnace box and the second carbon black layer, and graphitized carbon cloth is laid flat on the surface of the second carbon black layer. A graphitized resistance material layer is provided between the end of the outer furnace body and the end of the furnace box.

[0008] In the aforementioned graphitization furnace, the height of the second carbon black layer is 0.25 to 0.3 times the height of the outer furnace body; the height of the second post-calcination insulation layer is 0.35 to 0.39 times the height of the outer furnace body.

[0009] In the aforementioned graphitization furnace, on the plane along the width direction of the outer furnace body: the width A1 of the second carbon black layer is 0.13 to 0.14 times the width of the outer furnace body, and the width of the second calcined heat-insulating material layer is equal to the width of the second carbon black layer.

[0010] In the aforementioned graphitization furnace, the thickness of the furnace cover is 0.17 to 0.19 times the height of the outer furnace body, the furnace cover is provided with an exhaust port, and a second calcined resistance material layer is provided between the furnace cover and the furnace.

[0011] The aforementioned graphitization furnace comprises a bottom plate, side plates, and a cover plate. The bottom plate is laid on the surface of the first calcined resistance material layer. Columns are sequentially arranged along the edges of the plane formed by the bottom plate. Each of the four side faces of the column has a slot along its height. A side plate is positioned between the opposite faces of two adjacent columns, with the ends of the side plates engaging the slots on the side walls of the columns. The cover plate lies flat on the surface of the coke powder. By using a furnace assembled from interconnected components, rapid on-site assembly is possible, reducing labor and improving work efficiency.

[0012] In the aforementioned graphitization furnace, an inner support plate is provided on the side wall of the column facing the interior space of the furnace, and the inner support plate is inserted into a groove on the side wall of the column; an outer support plate is provided on the side wall of the column facing the outer furnace body, and the outer support plate is inserted into a groove on the side wall of the column; a chamfer is provided at the top corner of the inner support plate, and the size of the outer support plate matches the size of the chamfer.

[0013] In the aforementioned graphitization furnace, multiple sets of overlapping heating cores are arranged inside the coke powder. Limiting plates are provided on both sides of the heating cores. Two adjacent heating cores are arranged either parallel or vertically, with the end of one heating core overlapping the end of another heating core. The overlap length of the heating cores is 0.05 to 0.07 times the total length of the heating cores.

[0014] The technical solution of this utility model has achieved the following beneficial technical effects:

[0015] By setting up overlapping heating cores, the heating cores can move adaptively when the coke powder expands due to heat, preventing the heating cores from breaking and affecting the heating process. Furthermore, by setting up limiting plates, the stability of the interconnection of heating cores can be ensured. The overlapping of multiple heating cores can shorten the manufacturing length of a single heating core, reducing manufacturing and transportation costs. Attached Figure Description

[0016] Figure 1 A schematic cross-sectional view of the graphitization furnace of this utility model along its width.

[0017] Figure 2 A cross-sectional view of the graphitization furnace of this utility model along its length.

[0018] Figure 3 A top view of the graphitization furnace of this utility model;

[0019] Figure 4 A partial top view of the box furnace of this utility model;

[0020] Figure 5 A front sectional view of the column of this utility model;

[0021] Figure 6 A cross-sectional schematic diagram of the arrangement of heating cores inside the graphitization furnace of this utility model;

[0022] Figure 7 A schematic diagram of the heating element of this utility model;

[0023] Figure 8 A schematic diagram of the overlapping heating elements of this utility model.

[0024] The reference numerals in the figure are as follows: 1-Outer furnace body; 2-First carbon black layer; 3-First post-calcined insulation material layer; 4-Second carbon black layer; 5-Second post-calcined insulation material layer; 6-Box furnace; 61-Bottom plate; 62-Side plate; 63-Cover plate; 64-Inner support plate; 65-Outer support plate; 66-Column; 7-Heating core; 71-Limiting plate; 8-Furnace cover; 9-Exhaust port; 10-First post-calcined resistance material layer; 11-Graphitized resistance material layer; 13-Second post-calcined resistance material layer. Detailed Implementation

[0025] The graphitization furnace in this embodiment, such as Figure 1-2 As shown, it includes an outer furnace body 1, a box furnace 6, and a furnace cover 8. The box furnace 6 is set inside the outer furnace body 1, and an insulation layer is filled between the box furnace 6 and the outer furnace body 1. The furnace cover 8 is set on the top of the outer furnace body 1. Coke powder is loaded in the box furnace 6. There are two or more heating cores 7 in the box furnace 6. The ends of the heating cores 7 are connected to each other in sequence to form an electrical connection. The heating cores 7 at the end pass through the side walls of the box furnace 6 and the end of the outer furnace body 1 in sequence.

[0026] like Figure 1-2 As shown, a first carbon black layer 2 is laid flat on the inner bottom wall of the outer furnace body 1. A first calcined heat-insulating material layer 3 is laid flat on the surface of the first carbon black layer 2. A first calcined resistance material layer 10 is laid flat on the surface of the first calcined heat-insulating material layer 3. The bottom of the furnace box 6 is attached to the surface of the first calcined resistance material layer 10. In this embodiment, the height of the outer furnace body 1 is 5000mm, the thickness of the first carbon black layer 2 is 0.11 to 1.03 times the height of the outer furnace body 1, specifically 600mm; the thickness of the first calcined heat-insulating material layer 3 is 0.02 to 0.04 times the height of the outer furnace body 1, specifically 150mm; and the thickness of the first calcined resistance material layer 10 is 0.01 to 0.03 times the height of the outer furnace body 1, specifically 100mm.

[0027] like Figure 1 As shown, a second carbon black layer 4 is filled between the two opposite side walls of the outer furnace body 1 and the two side walls of the box furnace 6. The second carbon black layer 4 is pressed on the surface of the first calcined resistance material layer 10. A second calcined heat-insulating material layer 5 is attached to the top of the second carbon black layer 4, and the top of the second calcined heat-insulating material layer 5 is attached to the furnace cover 8. Graphitized carbon cloth is laid between the side wall of the box furnace 6 and the second carbon black layer 4, and graphitized carbon cloth is laid flat on the surface of the second carbon black layer 4. A graphitized resistance material layer 11 is provided between the end of the outer furnace body 1 and the end of the box furnace 6. The height of the second carbon black layer 4 is 0.25 to 0.3 times the height of the outer furnace body 1, specifically 1400 mm. The height of the second calcined heat-insulating material layer 5 is 0.35 to 0.39 times the height of the outer furnace body 1, specifically 1890 mm.

[0028] Specifically, the width of the outer furnace body 1 is 6420mm. On the plane along the width direction of the outer furnace body 1, the width A1 of the second carbon black layer 4 is 0.13 to 0.14 times the width of the outer furnace body 1, specifically 870mm. The width of the second calcined heat-insulating material layer 5 is equal to the width of the second carbon black layer 4.

[0029] The thickness of the furnace cover 8 is 0.17 to 0.19 times the height of the outer furnace body 1. The furnace cover 8 is provided with an exhaust port 9. A second calcined resistance material layer 13 is provided between the furnace cover 8 and the furnace box 6.

[0030] like Figure 2 , Figure 3 and Figure 4 As shown, the outer furnace body 1 has a length of 30400mm, the box furnace 6 has a length of 26670mm, a width of 3500mm, and a height of 2760mm. The box furnace 6 includes a bottom plate 61, side plates 62, and a cover plate 63. The bottom plate 61 is laid on the surface of the first calcined resistance material layer 10. Columns 66 are arranged sequentially along the edge of the plane formed by the bottom plate 61. The four side surfaces of the column 66 are provided with slots along their height direction. Side plates 62 are arranged between the opposite surfaces of two adjacent columns 66. The ends of the side plates 62 are inserted into the slots on the side walls of the column 66. The cover plate 63 is laid flat on the surface of the coke powder.

[0031] like Figure 3 , Figure 5 As shown, an inner support plate 64 is provided on the side wall of the column 66 facing the interior space of the furnace 6, and the inner support plate 64 is inserted into a slot on the side wall of the column 66; an outer support plate 65 is provided on the side wall of the column 66 facing the outer furnace body 1, and the outer support plate 65 is inserted into a slot on the side wall of the column 66; a chamfer is provided at the top corner of the inner support plate 64, and the size of the outer support plate 65 matches the size of the chamfer. In actual use, a corner of the top of the inner support plate 64 is cut off, and the cut-off corner forms the outer support plate 65. After the top of the inner support plate 64 is chamfered, the extension length of the edge of the inner support plate 64 can be effectively reduced, the strength can be improved, and material waste can be avoided.

[0032] like Figure 1 , Figure 6 As shown, multiple sets of overlapping heating cores 7 are arranged inside the coke powder, such as... Figure 7 , Figure 8 As shown, limit plates 71 are provided on both sides of the heating core 7. Two adjacent heating cores 7 are arranged in parallel or vertically. The end of one heating core 7 overlaps the end of another heating core 7. The overlap length of the heating core 7 is 0.05 to 0.07 times the total length of the heating core 7. Specifically, the heating core 7 is a graphite square column with a length of 1500 mm and a width of 150 mm. The overlap length is 100 mm. On the cross-section of the furnace 6, the horizontal spacing between adjacent heating cores 7 is 340 mm, and the vertical spacing between adjacent heating cores 7 is 330 mm.

[0033] Specifically during construction:

[0034] 1. First, lay a 600mm thick first carbon black layer 2, with a flatness of 5mm / 13m;

[0035] 2. Lay a layer of the first post-calcination insulation material 3150mm thick, and make it contact with the inner wall of the outer furnace body 1, with a flatness of 5mm / 13m; then lay the first post-calcination resistance material layer 10 thick.

[0036] 3. Place the base plate 61, and arrange the columns 66, side plates 62, inner support plate 64 and outer support plate 65 according to the drawings;

[0037] 4. A layer of graphitized carbon cloth is attached to the side of the column 66, and a second carbon black layer 4 with a height of 1300mm is filled in. A layer of graphitized carbon cloth is then attached to the surface of the second carbon black layer 4. Then, the second calcined insulation material layer 5 is placed to the specified height.

[0038] 5. Load coke powder into the furnace 6 and arrange the heating core 7 at the same time. Ensure a 100mm overlap at the joint of the heating core 7. After loading, lay a layer of cover plate 63 on the top and lay a layer of second calcined resistance material 13 on the cover plate 63. Finally, cover the furnace cover 8.

[0039] 6. Arrange the 45 exhaust ports 9 on the furnace cover 8 according to the diagram. The furnace cover 8 is made of 900mm thick calcined resistance material.

[0040] 7. Inspect all vents and the surrounding environment for cleanliness, and notify the power supply.

[0041] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A graphitization large box furnace comprising an outer furnace body (1), a box furnace (6) and a furnace cover (8), said box furnace (6) being disposed within said outer furnace body (1), said furnace cover (8) being disposed on top of said outer furnace body (1), characterized in that, The coke powder is loaded in the box furnace (6), two or more heating cores (7) are arranged in the box furnace (6), the end portions of the heating cores (7) are sequentially overlapped to form an electrical connection, and the heating cores (7) at the end portions sequentially pass through the side vertical walls of the end portions of the box furnace (6) and the outer furnace body (1).

2. The graphitization large box furnace according to claim 1, characterized by A first carbon black layer (2) is laid on the inner bottom wall of the outer furnace body (1), a first calcined heat preservation material layer (3) is laid on the surface of the first carbon black layer (2), a first calcined resistance material layer (10) is laid on the surface of the first calcined heat preservation material layer (3), and the box bottom of the box furnace (6) is attached to the surface of the first calcined resistance material layer (10).

3. The graphitization furnace according to claim 2, wherein The thickness of the first carbon black layer (2) is 0.11-1.03 times the height of the outer furnace body (1), the thickness of the first calcined heat preservation material layer (3) is 0.02-0.04 times the height of the outer furnace body (1), and the thickness of the first calcined resistance material layer (10) is 0.01-0.03 times the height of the outer furnace body (1).

4. The graphitization furnace according to claim 2, wherein Second carbon black layers (4) are filled between the opposite side walls of the outer furnace body (1) and the side walls of the box furnace (6), the second carbon black layers (4) are pressed on the surface of the first calcined resistance material layer (10), a second calcined heat preservation material layer (5) is attached to the top of the second carbon black layers (4), the top of the second calcined heat preservation material layer (5) is attached to the furnace cover (8), graphite carbon cloth is laid between the second carbon black layers (4) and the side walls of the box furnace (6), the surface of the second carbon black layers (4) is laid with graphite carbon cloth, and a graphitized resistance material layer (11) is arranged between the end portion of the outer furnace body (1) and the end portion of the box furnace (6).

5. The graphitization furnace according to claim 4, wherein The height of the second carbon black layer (4) is 0.25-0.3 times the height of the outer furnace body (1), and the height of the second calcined heat preservation material layer (5) is 0.35-0.39 times the height of the outer furnace body (1).

6. The graphitization furnace according to claim 5, wherein In the plane along the width direction of the outer furnace body (1), the width A1 of the second carbon black layer (4) is 0.13-0.14 times the width of the outer furnace body (1), and the width of the second calcined heat preservation material layer (5) is equal to the width of the second carbon black layer (4).

7. The graphitization furnace according to claim 2, wherein The thickness of the furnace cover (8) is 0.17-0.19 times the height of the outer furnace body (1), an exhaust port (9) is arranged on the furnace cover (8), and a second calcined resistance material layer (13) is arranged between the furnace cover (8) and the box furnace (6).

8. The graphitization furnace of claim 2, wherein The box furnace (6) comprises a bottom plate (61), a side plate (62) and a cover plate (63), the bottom plate (61) is laid on the surface of the first calcined resistance material layer (10), the plane formed by laying the bottom plate (61) is provided with a stand (66) along the edge thereof in sequence, the four side surfaces of the stand (66) are all provided with a clamping groove along the height direction thereof, the side plate (62) is arranged between the opposite surfaces of two adjacent stands (66), the end of the side plate (62) is clamped into the clamping groove on the side wall of the stand (66), and the cover plate (63) is laid on the surface of the coke powder.

9. The graphitization furnace according to claim 8, characterized in that, The side wall of the stand (66) towards the inside space of the box furnace (6) is provided with an inner side support plate (64) clamped into the clamping groove on the side wall of the stand (66), and the side wall of the stand (66) towards the outer furnace body (1) is provided with an outer side support plate (65) clamped into the clamping groove on the side wall of the stand (66); and the top corner of the inner side support plate (64) is provided with a chamfer, and the size of the outer side support plate (65) is consistent with the size of the chamfer.

10. The graphitization furnace of claim 1, wherein A plurality of groups of heating cores (7) are arranged in the coke powder and overlap with each other, the two side walls of the two ends of the heating core (7) are both provided with a limiting plate (71), and two adjacent heating cores (7) are arranged in parallel, arranged in up and down, the end of one heating core (7) is overlapped on the end of another heating core (7), and the overlapping length of the heating core (7) is 0.05-0.07 times of the total length of the heating core (7).

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