CN210741113U

CN210741113U - A hierarchical cooling formula stove cellar for storing things for production of lithium cell negative electrode material

Info

Publication number: CN210741113U
Application number: CN201921603050.3U
Authority: CN
Inventors: 张瑞林; 陈国教
Original assignee: Kaifeng Greyfont New Materials Co Ltd
Current assignee: Kaifeng Ruifeng New Material Co.,Ltd.
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-06-12
Anticipated expiration: 2029-09-24

Abstract

The utility model discloses a hierarchical cooling formula stove cellar for storing things for lithium cell negative electrode material production, the problem of solution is that traditional graphitizing furnace's cooling system overall structure is comparatively complicated, and the production process damages easily, and life is short. Cooling system include a plurality of levels cooling jacket, cooling jacket from the top down include one-level water jacket, second grade water jacket and tertiary water jacket in proper order, tertiary water jacket is connected with row material cooling system, the cross-sectional area of one-level water jacket is greater than the cross-sectional area of second grade water jacket, is equipped with annular cooling water tray between second grade water jacket upper portion and the one-level water jacket. The utility model discloses cooling system prolongs, and the structure is simpler, reduces the equipment maintenance, increases equipment life.

Description

A hierarchical cooling formula stove cellar for storing things for production of lithium cell negative electrode material

Technical Field

The utility model relates to a lithium cell negative pole material production field, concretely relates to hierarchical cooling type stove cellar for storing things for production of lithium cell negative pole material.

Background

In the lithium ion battery cathode material, the graphite carbon cathode material is always the main type of cathode material due to wide source and low price; the carbon material is a main raw material of a graphite lithium battery cathode material, carbon atoms of the carbon material are irregularly arranged, and the carbon atoms are recrystallized and rearranged in order only by high-temperature heat treatment at 2200-3000 ℃ in a furnace kiln such as a graphitizing furnace, so that the graphite lithium battery cathode material can present a graphite crystal structure, and has a plurality of excellent performances of graphite, such as obviously improved electrical conductivity and thermal conductivity, better chemical and thermal stability, reduced impurities, reduced hardness, easier machining and the like. The graphitizing furnace has the function of converting carbonaceous materials into artificial graphite materials, such as graphite materials which can provide high-quality carbon elements for iron and steel smelting, aluminum smelting, cathode materials, other non-ferrous metal industries, nuclear industry and the like.

The most widely used graphitization furnace at present is the acheson furnace. The Acheson furnace is of an open type rectangular furnace body structure, the production process comprises the steps of longitudinally or transversely paralleling carbonized materials, filling metallurgical coke and quartz sand around the carbonized materials, electrifying in the length direction of the furnace body, utilizing resistance heating of the coke, and finally enabling the heated object to generate resistance heating; and lining materials such as coke powder, carbon black, silica sand/coke/silicon carbide mixture and the like are used for heat shielding at the periphery of the coke so as to insulate heat. However, the existing Acheson furnace can not meet the requirements of energy conservation and emission reduction, safe operation and stable product quality.

In contrast, patent No. CN201010108180.7 discloses a vertical high-temperature continuous graphitization furnace. The cooling system of the graphitizing furnace is characterized in that a central cooling area is arranged in a peripheral cooling device, a cooling water pipe is separately arranged for cooling the central cooling area to introduce cooling water into the upper part of the central cooling area, the cooling water falls from the upper part of the central cooling area to the lower part of the central cooling area and then is discharged through a water outlet, meanwhile, materials pass through and are discharged from the outer side of the central cooling area, and the materials are simultaneously cooled by the peripheral cooling device and the central cooling area when passing through the central cooling area, so that the cooling effect is good; however, the lower outlet of the peripheral cooling device needs to be integrated with the valve, the pipeline and the like related to the inlet and the outlet of cooling water of the central cooling area, the material outlet and the like, so that the peripheral cooling device and the material outlet are not interfered with each other, the overall structure is complex, the production process is easy to damage, and the service life is short.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that the cooling system overall structure of traditional graphitizing furnace is comparatively complicated, and the production process damages easily, and life is short, provides a simple structure, long service life's a hierarchical cooling type stove cellar for storing things that is used for lithium cell negative pole material to produce.

In order to solve the technical problem, the utility model adopts the following technical scheme: a graded cooling type furnace pit for producing a lithium battery negative electrode material comprises a furnace body and a support frame, wherein a furnace cover is arranged above the furnace body, a cooling system is arranged below the furnace body, and a discharging cooling system is arranged at the lower part of the cooling system; the support frame comprises a stand column, a cross beam is arranged on the stand column, and the furnace body is arranged above the cross beam; the cooling system comprises a plurality of stages of cooling water jackets, the cooling water jackets sequentially comprise a first-stage water jacket, a second-stage water jacket and a third-stage water jacket from top to bottom, the third-stage water jacket is connected with the discharging cooling system, the cross sectional area of the first-stage water jacket is larger than that of the second-stage water jacket, and an annular cooling water disc is arranged between the upper part of the second-stage water jacket and the first-stage water jacket.

The interior of the annular cooling water disk is formed by winding cooling water pipes one by one.

The inner walls of the secondary water jacket and the tertiary water jacket are provided with graphite lining layers;

the first-stage water jacket, the second-stage water jacket and the third-stage water jacket are all of cylindrical structures.

The discharging and cooling system comprises a connecting plate, the upper part of the connecting plate is connected with the third-stage water jacket, the lower part of the connecting plate is provided with a fourth-stage water jacket and a fifth-stage water jacket, and the fourth-stage water jacket and the fifth-stage water jacket are connected through a conical water jacket.

The utility model discloses a cooling system extension, the structure is simpler, reduces the equipment maintenance, increases equipment life.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1;

fig. 3 is a schematic top view of the furnace lid of the present invention;

fig. 4 is a schematic cross-sectional structure of the furnace lid of the present invention;

FIG. 5 is a schematic side view of the furnace lid of the present invention;

fig. 6 is a second schematic side view of the furnace lid of the present invention;

FIG. 7 is a schematic view of the discharge cooling structure of the present invention;

FIG. 8 is a schematic view of the structure of the lower part of the three-stage water jacket of the present invention;

fig. 9 is a schematic view of the top view of the discharge cooling structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1 to 9, a graded cooling furnace pit for producing a lithium battery cathode material comprises a furnace body 1 and a support frame 5, wherein a furnace cover 4 is arranged above the furnace body, a cooling system 2 is arranged below the furnace body 1, and a discharging cooling system 3 is arranged at the lower part of the cooling system 2; the support frame 5 comprises a vertical column 51, a beam 52 is arranged on the vertical column 51, and the furnace body 1 is arranged above the beam 52. The cooling system 2 comprises a plurality of stages of cooling water jackets, the cooling water jackets sequentially comprise a first-stage water jacket 21, a second-stage water jacket 22 and a third-stage water jacket 23 from top to bottom, the third-stage water jacket 23 is connected with the discharging cooling system 3, the cross sectional area of the first-stage water jacket 21 is larger than that of the second-stage water jacket, and an annular cooling water disc 26 is arranged between the upper part of the second-stage water jacket 22 and the first-stage water jacket 21. The upper part of the primary water jacket 21 is connected with the furnace body. Each stage of cooling water jacket of the cooling system 2 comprises cooling water pipes, cooling water passes through the cooling water pipes and is not full of the whole cooling water jacket, and each cooling water jacket is provided with an independent water inlet and an independent water outlet, so that a layered cooling device is formed, the cost is reduced, and the cooling efficiency is improved.

The inside of the annular cooling water disk 26 is formed by winding cooling water pipes one by one. The annular cold water plate has a larger cooling area and is suitable for high-temperature products with higher cooling temperature, and the annular cold water plate is arranged between the first-stage water jacket and the second-stage water jacket, so that high-temperature materials coming out of the first-stage water jacket are greatly cooled, then the materials are gradually cooled through the second-stage water jacket, the third-stage water jacket and the discharging cooling system, the cooling level is clear, the cooling division is clear, the cooling efficiency is improved, and the cooling effect is optimized.

And graphite lining layers 27 are arranged on the inner walls of the secondary water jacket 22 and the tertiary water jacket 23. The graphite lining layer 27 has good heat transfer effect and fast heat transfer, accelerates the heat exchange speed between the material and the cooling water, and is suitable for the two-stage water jacket 22 area and the three-stage water jacket 23 area with higher material temperature. And the graphite lining layer 27 is not arranged in the region of the primary water jacket 21, because the material which just falls from the furnace body is primarily cooled in the region of the primary water jacket, the cooling strength cannot be too large. The temperature of the lower electrode of the furnace body is prevented from being influenced, the lower electrode is protected, the furnace body is prevented from exploding, and the temperature of high-temperature materials is preliminarily reduced.

The primary water jacket 21, the secondary water jacket 22 and the tertiary water jacket 23 are all in a cylindrical structure.

The discharge cooling system 3 comprises a connecting plate 34, a four-stage water jacket 31 and a five-stage water jacket 32 are arranged below the connecting plate 34, and the four-stage water jacket 31 and the five-stage water jacket 32 are connected through a conical water jacket 33. The four-stage water jacket 31, the conical water jacket 33 and the five-stage water jacket 32 are respectively provided with an independent water inlet and an independent water outlet, so that cooling is carried out in a grading manner, and the cooling effect is good. The discharging cooling system 3 is used as a part of the cooling system, the cooling system is greatly lengthened, the cooling distance of the material during falling is increased, the cooling effect is increased, the structure is simple, all levels of cold area water jackets and the discharging cooling system 3 can be connected through simple fixing, the structure is simple, and the service life is long.

Two four-stage water jackets 31 are arranged below the connecting plate 34, and pulleys 35 are arranged on the lower surface of the connecting plate 34; the upright post 51 is further provided with a movable beam 53, the movable beam 53 is arranged below the three-stage water jacket 23, the movable beam 53 is provided with a slide rail 531, and the pulley 35 is matched with the slide rail 531. The pulley 35 moves in the slide rail 531, and the butt joint of any one of the four-stage water jacket 31 and the three-stage water jacket 23 on the connecting plate 34 is realized.

Three-level water jacket 23 below be equipped with square board 232, square board 232 both sides are equipped with two apron 231, apron 231 is connected with square board 232 is articulated. When the feeding port of one fourth-stage water jacket 31 on the connecting plate 34 is selected to correspond to the blanking port of the third-stage water jacket 23, the feeding port of the other fourth-stage water jacket 31 on the connecting plate 34 is covered by the corresponding cover plate 231, so that the four-stage water jacket 31 is protected.

The utility model discloses a supporting two sets of row material cooling system that have set up under connecting plate 34, when one of them row material cooling system takes place to damage, only need push away gently, just can be corresponding with the feed inlet of another row material cooling system level four water jacket 31 and tertiary water jacket 23's blanking mouth, the operation process is quick, simple, avoids shutting down the loss that leads to the fact for the enterprise, improves work efficiency, reduction in production cost.

Bell 4 of stove is the bellied spherical structure that makes progress, bell 4 include a plurality of segment 41, the apex angle department of segment 41 is equipped with arc wall 42, is equipped with outer hole 43 and inlayer hole 44 on the sector of segment 41. The furnace cover assembled by the fan-shaped blocks 41 has integrity, the normal service life of the furnace cover reaches 8-10 years, and the service life of the furnace cover is greatly prolonged.

The vertical distance h between the highest lower surface 49 of the inner surface of the furnace lid 4 is greater than 450 mm. The utility model discloses the highest perpendicular distance that is in between lower surface 49 of 4 internal surfaces of bell of spherical structure is 500mm, and the thickness of segment 41 is 180 + 220mm, has increased the distance of bell body with furnace body high temperature area for even the furnace body internal temperature reaches more than 2800 ℃, the bell still can not damage, higher furnace body temperature, great improvement the graphitization degree of product. The utility model discloses the graphitization degree of the lithium battery negative electrode material of production reaches 96%, and the carbon content reaches more than 99%, and the graphitization degree of the lithium battery negative electrode material that traditional handicraft made can only reach about 90%, and the carbon content is only within 99%. The quality of the lithium battery cathode material prepared by the utility model has qualitative leap.

And adopt the utility model discloses a kiln, the desulfurization time also shortens greatly, and traditional kiln desulfurization is accomplished and is needed 6-7 hours, and the sulphur content after the desulfurization is between 0.05-1.5%, and the utility model discloses the desulfurization is accomplished and only needs 3-4 hours, and the off-the-shelf sulphur content is detected and is reached within 0.05%.

The number of the fan-shaped blocks 41 is 4, the central angle of each fan-shaped block is 90 degrees, and the arc-shaped grooves 42 of the four fan-shaped blocks 41 form a circular electrode hole 45; the positive electrode of the kiln is inserted in the electrode hole 45 and used for discharging electricity to the inside of the kiln.

Each sector 41 is provided with an inner layer hole 44 and two outer layer holes 43. The four fan-shaped blocks 41 are provided with four inner layer holes 44 and eight outer layer holes 43, wherein two inner layer holes 44 are used for the insertion holes of the flue pipe of the kiln, and the other two inner layer holes 44 are used for the insertion holes of the explosion-proof air bag of the kiln; eight outer holes 43 are used for the insertion holes of the material feeding pipeline. The fan-shaped blocks of the utility model can be three, five, six, etc., and the number of the outer layer holes 43 and the inner layer holes 44 is enough.

A bulge 46 is arranged on one side of each sector 41, a groove 47 is arranged on the other side of each sector 41, adjacent sectors 41 are connected through the matching of the bulge 46 and the groove 47, and heat insulation cotton 48 is arranged between the bulge 46 and the groove 47 of each adjacent sector 41. The external dimension of the protrusion 46 is matched with the internal dimension of the groove 47, and when the fan-shaped fan is installed, the protrusion of one fan-shaped block 41 is clamped into the groove of the adjacent; the heat insulation cotton 48 is arranged to fill the gap between the bulge 46 and the groove 47 of the adjacent fan-shaped block 41, and simultaneously, the heat insulation effect is achieved, and heat leakage from the gap between the bulge 46 and the groove is prevented.

The lower surface 49 of the outer side of the sector block 41 is a plane and is used for matching with the upper surface of the furnace body 1. The fan-shaped blocks 41 can be stably arranged on the furnace body.

The utility model discloses because 500mm has been increased to the bell, and adopts the overall structure design for the high temperature resistance of bell increases, and has prolonged the high temperature region of furnace body, makes the interior temperature of stove can reach more than 2800 ℃, and after the interior temperature reached 2800 ℃, the graphitization degree of material increased greatly in the stove, and the carbon content increases, and metallic impurity becomes few, and product quality has obtained qualitative leap.

Adopt the graphite that above-mentioned technical scheme produced, each item data is obviously superior to national standard, and because each item data of the lithium cell negative pole material of producing with other technologies of trade, the utility model discloses the concrete detection data of the graphite that 4 batches were produced see table 1 below:

table 1: the utility model discloses the concrete detection data table of each batch production's graphite

Claims

1. The utility model provides a hierarchical cooling formula stove cellar for storing things for lithium cell negative electrode material production which characterized in that: the furnace comprises a furnace body (1) and a support frame (5), wherein a furnace cover (4) is arranged above the furnace body, a cooling system (2) is arranged below the furnace body (1), and a discharging and cooling system (3) is arranged at the lower part of the cooling system (2); the support frame (5) comprises a vertical column (51), a cross beam (52) is arranged on the vertical column (51), and the furnace body (1) is arranged above the cross beam (52); the cooling system (2) comprises a plurality of stages of cooling water jackets, the cooling water jackets sequentially comprise a first-stage water jacket (21), a second-stage water jacket (22) and a third-stage water jacket (23) from top to bottom, the third-stage water jacket (23) is connected with the discharging cooling system (3), the cross sectional area of the first-stage water jacket (21) is larger than that of the second-stage water jacket, and an annular cooling water disc (26) is arranged between the upper part of the second-stage water jacket (22) and the first-stage water jacket (21).

2. The staged-cooling kiln for the production of negative electrode materials for lithium batteries as claimed in claim 1, wherein: the interior of the annular cooling water plate (26) is formed by winding cooling water pipes one by one.

3. The staged-cooling kiln for the production of negative electrode materials for lithium batteries as claimed in claim 1, wherein: graphite lining layers (27) are arranged on the inner walls of the secondary water jacket (22) and the tertiary water jacket (23);

the primary water jacket (21), the secondary water jacket (22) and the tertiary water jacket (23) are all in cylindrical tube structures.

4. The staged-cooling kiln for the production of negative electrode materials for lithium batteries as claimed in claim 3, wherein: the discharging cooling system (3) comprises a connecting plate (34), the upper part of the connecting plate (34) is connected with the third-stage water jacket (23), the lower part of the connecting plate (34) is provided with a fourth-stage water jacket (31) and a fifth-stage water jacket (32), and the fourth-stage water jacket (31) and the fifth-stage water jacket (32) are connected through a conical water jacket (33).