CN117704788A - Continuous production type rotary kiln and material continuous processing method - Google Patents
Continuous production type rotary kiln and material continuous processing method Download PDFInfo
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- CN117704788A CN117704788A CN202211088081.6A CN202211088081A CN117704788A CN 117704788 A CN117704788 A CN 117704788A CN 202211088081 A CN202211088081 A CN 202211088081A CN 117704788 A CN117704788 A CN 117704788A
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- 239000000463 material Substances 0.000 title claims abstract description 87
- 238000010924 continuous production Methods 0.000 title claims abstract description 30
- 238000003672 processing method Methods 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000011282 treatment Methods 0.000 claims abstract description 16
- 238000010000 carbonizing Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 238000005253 cladding Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 12
- 229910002804 graphite Inorganic materials 0.000 abstract description 12
- 239000010439 graphite Substances 0.000 abstract description 12
- 239000010406 cathode material Substances 0.000 abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052744 lithium Inorganic materials 0.000 abstract description 7
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 19
- 238000007789 sealing Methods 0.000 description 16
- 238000005096 rolling process Methods 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 238000009656 pre-carbonization Methods 0.000 description 10
- 238000005469 granulation Methods 0.000 description 9
- 230000003179 granulation Effects 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 238000003763 carbonization Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 6
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- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
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- 238000005245 sintering Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
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- 239000000779 smoke Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
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- 238000009434 installation Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 1
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- 238000011049 filling Methods 0.000 description 1
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- 239000007773 negative electrode material Substances 0.000 description 1
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- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention discloses a continuous production type rotary kiln and a material continuous processing method, and belongs to the technical field of rotary kiln equipment. The invention comprises a first cylinder body, a second cylinder body and a through part, wherein the second cylinder body is provided with at least 2 sections, the through part is arranged between two adjacent sections of second cylinder bodies, the first cylinder body penetrates through the second cylinder body and the through part, and a continuous channel is formed between the first cylinder body and the second cylinder body as well as between the first cylinder body and the through part; according to the process requirement, the rotary kiln can be divided into at least 2 treatment areas, and different treatment areas finish different procedures of material production; the first cylinder body rotates in linkage with the through part. The rotary kiln disclosed by the invention has the advantages of high energy utilization rate, compact structure, energy conservation, environmental friendliness and capability of realizing multi-process continuous production, and is very suitable for continuous treatment of granulating and pre-carbonizing of graphite cathode materials of lithium batteries, and is also suitable for other similar processes.
Description
Technical Field
The invention relates to the technical field of lithium battery material preparation, in particular to a continuous production rotary kiln and a material continuous processing method.
Background
At present, the graphite cathode material of the lithium battery commonly used in the market is mainly artificial graphite, and the basic working procedures of the material are crushing, granulating, graphitizing, sieving and the like. In the existing production process, the granulating process is to add pretreated aggregate, binder and other materials into a hot-pack kettle, install resistance wires outside the hot-pack kettle, transfer heat to the materials in the kettle through the wall surface, and uniformly stir and mix the materials below 650 ℃, so as to granulate and primarily carbonize, and the granulated materials enter the next graphitization process after being cooled by a cooling kettle. Since graphitization cost is the highest proportion of the production of the anode material, it is about 50% of the cost of the anode material. In order to improve the filling rate of the graphitization process and save the cost, the material is further pre-carbonized before graphitization in the industry, and the pre-carbonized is usually carried out by heating the material to 1000 ℃ through a kiln such as a tunnel kiln and the like, so that the volatile content of the material is reduced.
Main equipment involved in the existing preparation process of the graphite cathode material of the lithium battery, such as a hot ladle kettle and a cooling kettle, are intermittent equipment, are only suitable for small batch intermittent production, and have low production efficiency; and tunnel kiln etc. belong to static heating, and relative to dynamic heating, its heat transfer efficiency is lower, and is heated inhomogeneous, and holds the crucible of material and has also absorbed a large amount of heats in the carbomorphism in-process, need cool off together and lead to the energy consumption higher. In addition, the materials are heated to 650 ℃ in a hot ladle kettle for granulation and preliminary carbonization, the materials after granulation also need to be cooled to normal temperature and then enter a kiln such as a tunnel kiln, and the temperature is increased from normal temperature to about 1000 ℃ again, so that the process is complex and energy is wasted seriously.
Through searching, the Chinese patent application number is 202110437669.7, the application date is 22 days of 4 months of 2021, and the invention is named as: the rotary reactor of the application comprises a graphite negative electrode material coating section/positive electrode material presintering section connected with a feeding end and a graphite negative electrode carbonization section/positive electrode material sintering section connected with the coating/presintering section so as to realize sequential and continuous conveying of reaction materials from the feeding end, the coating/presintering section and the carbonization/sintering section to a discharging end, a first heating furnace for realizing coating/presintering of the reaction materials by heating is arranged outside the coating/presintering section of the rotary reactor, and a second heating furnace for realizing carbonization/sintering of the reaction materials by heating is arranged outside the carbonization/sintering section of the rotary reactor. This application heating furnace body divide into two sections, is cladding section and carbomorphism section respectively, sets up strutting arrangement between two sections, and common sense can know for preventing strutting arrangement from being heated, and this strutting arrangement needs to keep certain cooling distance with barrel heating section still enough support space, and the increase of equipment area must be led to in the trend, and on the other hand this strutting arrangement exposes in the air, has the heat loss, has caused the waste of energy, and simultaneously, the material of this section must have the cooling of certain degree, leads to the material quality unstable.
Chinese patent No. ZL201921255044.3, grant bulletin day 2020, 4 months and 17 days, and the invention is named: a rotary kiln supporting structure; this application includes rotary kiln barrel, a plurality of backing sheet and backing wheel, and the backing wheel passes through the backing sheet to be installed on the outer wall of rotary kiln barrel, and the rivet is installed to rotary kiln barrel and the coaxial heart line of backing wheel to the one end of backing sheet, and the backing sheet passes through the rivet equipartition on the outer wall of rotary kiln barrel, and the face that the backing sheet was located is tangent with the excircle of rotary kiln barrel, and the other end of backing sheet is connected with the installation arm, and the one end that the backing sheet was kept away from to the installation arm is articulated with the backing wheel. However, the main purpose of this application is to connect the rotary kiln cylinder with the rotary kiln cylinder through the supporting sheet, so that the rotary kiln cylinder is separated from the rotary kiln cylinder by a certain distance, and the high temperature of the rotary kiln cylinder borne by the rotary kiln cylinder is reduced, and the rotary kiln cylinder is not relevant to the problems involved in the preparation process of the graphite cathode material of the lithium battery.
Disclosure of Invention
1. Technical problem to be solved by the invention
In view of the problems of low production efficiency, low heat transfer efficiency and high energy consumption of equipment such as granulation, pre-carbonization and the like in the preparation process of the graphite cathode material of the lithium battery in the prior art, the invention provides the continuous production rotary kiln and the material continuous processing method.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to a continuous production rotary kiln, which comprises a first cylinder, a second cylinder and a through part, wherein the second cylinder is provided with at least 2 sections, the through part is arranged between two adjacent sections of second cylinders, the first cylinder penetrates through the second cylinder and the through part, and a continuous channel is formed between the first cylinder and the second cylinder as well as between the first cylinder and the through part; the rotary kiln is divided into at least 2 treatment areas, and different procedures of production are completed in different treatment areas; the first cylinder body rotates in linkage with the through part.
As a further improvement of the invention, the through part comprises a third cylinder and a plurality of supporting pieces, wherein the supporting pieces are arranged along the circumferential direction of the first cylinder, one end of each supporting piece is connected with the first cylinder, and the other end of each supporting piece is connected with the third cylinder.
As a further improvement of the invention, one end of the supporting piece is fixedly connected with the first cylinder, and the other end is hinged with the third cylinder.
As a further improvement of the invention, the second cylinder and the through part form an outer cylinder, one end of the outer cylinder is provided with a heat source inlet, and the other end of the outer cylinder is provided with a heat source outlet, wherein the heat source inlet is close to the discharging part, the heat source outlet is close to the material conveying part, and the heat source inlet is communicated with the heat source outlet through the channel.
As a further improvement of the present invention, a driving part is disposed at one end of the first cylinder, and the driving part is provided with a main driving part and an auxiliary driving part, and when the main driving part stops running, the auxiliary driving part cuts in to continue driving the first cylinder to rotate.
As a further improvement of the invention, the rotary kiln is divided into a granulating and cladding area and a pre-carbonizing area, wherein the granulating and cladding area is close to the material conveying part, and the pre-carbonizing area is close to the material discharging part.
As a further improvement of the invention, the inner side wall of the first cylinder body in the granulating and coating area is provided with shoveling pieces which are uniformly arranged along the circumferential direction of the inner side wall of the first cylinder body, and meanwhile, the shoveling pieces are arranged at intervals along the axial direction of the first cylinder body, and the interval is increased along the material conveying direction.
As a further improvement of the invention, the material-copying piece comprises a first material-copying section and a second material-copying section, wherein an included angle beta larger than 90 degrees is formed between the first material-copying section and the second material-copying section, the first material-copying section is connected with the inner side wall of the first barrel, and a notch is formed at the joint of the first material-copying section and the first barrel.
As a further improvement of the invention, the outer side wall of the first cylinder body is provided with the flow guiding spiral, the flow guiding spiral is arranged along the axial direction of the first cylinder body, and a plurality of first through holes are formed in the position, close to the outer side wall of the first cylinder body, of the flow guiding spiral.
As a further improvement of the invention, the two ends of the first cylinder extending out of the second cylinder are respectively provided with a first supporting part and a second supporting part, and the through part is provided with a third supporting part.
As a further improvement of the invention, a jacket is arranged at the joint of the material conveying part and the first cylinder body, and a protective air source inlet is arranged on the jacket.
According to the method for continuously processing the materials by using the rotary kiln, the materials are conveyed into the first cylinder of the rotary kiln, the heat source enters the channel through the heat source inlet, the heat source indirectly contacts the materials in the first cylinder for countercurrent heat exchange, and the materials are processed in different processing areas of the rotary kiln and then output.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) The continuous production rotary kiln is divided into at least 2 treatment areas, different treatment areas can finish different production procedures, continuous production of 2 procedures of granulating and pre-carbonizing graphite cathode materials is realized, multiple heating and cooling are not needed, the process is simple, and the degree of automation is high; and the materials are heated by dynamic rotation, so that the materials are heated more uniformly, the heat transfer effect is greatly improved compared with the traditional static heating, and the situations of energy waste such as crucible heat absorption and the like in the traditional carbonization process are avoided.
(2) According to the continuous production rotary kiln, the through part containing the supporting piece is adopted, the supporting structure of the through part effectively compensates the heated radial expansion of the first cylinder, reduces the internal stress of the first cylinder caused by expansion deformation, adopts multiple points to support the first cylinder on one hand, ensures that the structure is more reliable and safer, reduces the heat loss and the space waste caused by all sections of the rotary kiln on the other hand, improves the energy utilization rate, and has more compact structure and smaller equipment occupation area.
(3) According to the continuous production rotary kiln, the shoveling piece is arranged on the inner side wall of the first barrel body in the granulating and coating area, so that the heat transfer efficiency is improved, the shoveling piece adopts the hollowed flanging structure, the height of the shoveling piece does not exceed the highest height of a material layer, and the hollowed space is deviated to the advancing direction of the material, so that a small amount of material can be taken away after the shoveling piece exposes the height of the material layer in the rotating process of the first barrel body, and the taken away material can slide along the gap space between the shoveling piece and the barrel wall, so that on one hand, the serious dust emission of the material is prevented, and on the other hand, the full friction and mixing among the materials are ensured, and the granulation is facilitated; in the pre-carbonization area, no or few shoveling plates are arranged, so that dust emission is further reduced, and the method is more economical and reasonable.
(4) According to the continuous production rotary kiln, the diversion spiral is arranged on the outer side wall of the first barrel body in the granulation coating area, so that the smoke can circulate uniformly, the first barrel body is heated uniformly, the materials are heated uniformly, the diversion spiral is provided with the plurality of first through holes near the outer side wall of the first barrel body, the smoke circulates along the outer side wall of the first barrel body as much as possible, and the heat transfer effect is further improved.
(5) According to the continuous production rotary kiln, the preheated protective gas (such as nitrogen) enters the kiln from the material feeding end, so that waste gas in the kiln is driven, the whole length of the kiln is ensured to be in the nitrogen protection range, and on the other hand, the phenomenon that the waste gas in the kiln is condensed by cold nitrogen to be stained with walls is prevented, and the heat resistance after being stained with walls is prevented from being improved, so that the heat exchange efficiency is prevented from being influenced.
Drawings
FIG. 1 is a schematic structural view of a continuous production rotary kiln according to the present invention;
FIG. 2 is a cross-sectional view at A-A in FIG. 1;
FIG. 3 is an assembled schematic view of the first cylinder and the third cylinder;
FIG. 4 is a cross-sectional view of FIG. 3;
FIG. 5 is a schematic view of the through portion in FIG. 4;
FIG. 6 is a schematic diagram of the seal between the second cylinder and the third cylinder;
FIG. 7 is a schematic view of an arrangement of a flow-guiding helix;
FIG. 8 is a schematic view of the arrangement of the shovelling member;
fig. 9 (a) is a side view of the shovelling member; fig. 9 (b) is a front view of the shovelling member;
FIG. 10 is a schematic view of the structure of the feed section and drive section of the rotary kiln;
fig. 11 is a schematic view of another view of the driving part of the rotary kiln.
Reference numerals in the schematic drawings illustrate:
1. a first cylinder; 11. a material guiding spiral; 12. a material copying piece; 121. a first material-making section; 122. a second material-making section; 123. a notch; 13. a diversion spiral; 131. a first through hole;
2. a second cylinder; 21. a heat source inlet; 22. a heat source outlet; 23. a temperature measuring element;
31. a first support; 32. a first rolling ring;
41. a second support; 42. a second rolling ring;
5. a through part; 51. a third support; 52. a third rolling ring; 521. a backing plate; 522. a stop block; 53. a third cylinder; 54. a support;
6. a driving section; 61. a first motor; 62. a speed reducer; 63. a coupling; 64. a first drive gear; 65. a second drive gear; 66. a second motor; 67. a switching member; 68. driving clutch;
7. a material conveying part; 71. a screw conveyor; 72. protecting an air source inlet; 73. a jacket;
8. a discharging part;
9. a sealing part; 91. a second anchor; 92. a first seal; 93. a second seal; 94. a third seal; 95. a second screw; 96. a second nut;
10. and (5) material.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present invention and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, the continuous production rotary kiln of the embodiment comprises a first cylinder 1, a second cylinder 2 and a through part 5, wherein the second cylinder 2 is provided with at least 2 sections, the through part 5 is arranged between two adjacent sections of second cylinders 2, the first cylinder 1 is commonly called a rotary center cylinder in practical application, the section of the rotary center cylinder is circular, and the rotary center cylinder is made of high-temperature heat-resistant steel. One end of the rotary center cylinder is connected with the material conveying part 7 in a sealing way, and the other end is connected with the material discharging part 8 in a sealing way. The second cylinder 2 is commonly referred to as a furnace or shell in practice. The through-part 5 comprises a third cylinder 53 and a support 54.
In this embodiment, the second cylinder 2 and the third cylinder 53 are assembled into a furnace housing (i.e., an outer cylinder), and the first cylinder 1 penetrates the furnace housing. Meanwhile, since the through part 5 is provided along the circumferential direction of the first cylinder 1 by the supporting member 54, one end is connected to the first cylinder 1, and the other end is connected to the third cylinder 53, a continuous heat source channel is formed between the first cylinder 1 and the second cylinder 2, and between the first cylinder 53. One end of the furnace body shell is provided with a heat source inlet 21, and the other end of the furnace body shell is provided with a heat source outlet 22, wherein the heat source inlet 21 is close to the discharging part 8, the heat source outlet 22 is close to the material conveying part 7, and the heat source inlet 21 is communicated with the heat source outlet 22 through the channel. The embodiment belongs to an external heating rotary kiln, and a heat source is high-temperature flue gas.
Under the design background of the embodiment, the rotary kiln can be divided into a plurality of treatment areas, continuous production of different procedures can be carried out by utilizing different temperatures of high-temperature flue gas in different treatment areas, heat loss and space waste caused by all sections of the rotary kiln are reduced, the energy utilization rate is improved, the structure is more compact, and the occupied area of equipment is smaller.
Taking the production of the artificial graphite cathode material as an example, realizing the continuous production of 2 working procedures of granulating and pre-carbonizing, and having no need of multiple heating and cooling, simple process and high degree of automation; and the materials are heated by dynamic rotation, so that the materials are heated more uniformly, the heat transfer effect is greatly improved compared with the traditional static heating, and the situations of energy waste such as crucible heat absorption and the like in the traditional carbonization process are avoided.
Besides granulation and pre-carbonization of graphite cathode materials, under the design principle of the embodiment, a plurality of treatment areas can be formed in the rotary kiln by prolonging the length of the rotary kiln body so as to adapt to continuous production with more multiple steps.
On the other hand, the length of the rotary kiln body is relatively long, and the rotary kiln body is further lengthened necessarily due to the arrangement of the multi-section treatment areas based on the design thought of the embodiment. In view of this, in the present embodiment, the first support portion and the second support portion are provided at both ends of the first cylinder 1 extending out of the second cylinder 2, respectively, and at the same time, the third support portion is provided at the through portion 5, the third cylinder 53 is arranged coaxially with the first cylinder 1, and the first cylinder 1 and the third cylinder 53 are rotated in linkage via the support 54. The first cylinder body 1 is respectively arranged on the first supporting part and the second supporting part, and the third supporting part is closer to the high-temperature region, so that the bending deformation and stress of the first cylinder body 1 are reduced, and the reliability of the first cylinder body 1 of the core part is ensured.
Referring to fig. 1, 3 and 4, the first support portion includes a first support 31 and a first rolling ring 32, the second support portion includes a second support 41 and a second rolling ring 42, the third support portion includes a third support 51 and a third rolling ring 52, the first rolling ring 32 and the second rolling ring 42 are disposed on the outer peripheral wall of the first cylinder 1, and the third rolling ring 52 is disposed on the outer peripheral wall of the third cylinder 53. A backing plate 521 and a stopper 522 are further provided between the third rolling ring 52 and the third cylinder 53, and similarly, a backing plate and a stopper are also provided between the first rolling ring 32, the second rolling ring 42, and the first cylinder 1. The first support 31, the second support 41 and the third support 51 form a support for the respective rolling rings.
The third support is formed at the through part 5, so that the stress of the first cylinder 1 is reduced and the rigidity of the first cylinder 1 is ensured. The supporting structure of the through part 5 effectively compensates the radial expansion of the first cylinder 1 caused by heating, and reduces the internal stress of the first cylinder 1 caused by expansion deformation. The first barrel is supported by multiple points, so that the structure is more reliable and safer.
The second cylinder 2 is divided into two sections by the through part 5, which can be called a front furnace body and a rear furnace body, and each section is divided into an upper section and a lower section. The total number of the furnace bodies is 4, namely a front upper furnace body, a front lower furnace body, a rear upper furnace body and a rear lower furnace body. Wherein, all set up a plurality of temperature measuring element 23 on preceding upper furnace body, the back upper furnace body for monitor flue gas temperature, in order to ensure that the material is heated according to temperature curve. The furnace body is a steel shell with a lining, the lining is a high-temperature-resistant heat insulation material, the front/rear upper furnace body and the front/rear lower furnace body are provided with round holes along the end face of the feeding/discharging direction, the diameter of each round hole is slightly larger than that of the first cylinder body 1, the other end of each round hole is in a circular ring through hole shape, the end face is in sealing connection with the third cylinder body 53, the middle shape of the furnace body can be any shape larger than that of the first cylinder body 1 except the end face sealed with the third cylinder body 53, and a flue gas channel can be formed with the rotary center cylinder.
The rotary kiln is obliquely arranged, and the feeding end is from high to low to the discharging end. The included angle between the central axis and the horizontal line is alpha, and alpha is more than 0 degree and less than or equal to 6 degrees.
Example 2
Referring to fig. 2, in the continuous production rotary kiln according to this embodiment, substantially the same as embodiment 1, the number of supporting members 54 is specifically set 6 along the circumferential direction of the first cylinder 1, the third cylinder 53 is provided with connecting members along the circumferential direction of the inner side wall thereof at intervals, the connecting members may be rib plates, one end of each supporting member 54 is welded and fixed on the first cylinder 1, and the other end of each supporting member 54 is welded and fixed on the rib plates in a tangent manner with the outer wall of the first cylinder 1.
Example 3
Referring to fig. 5, in the continuous production rotary kiln of the present embodiment, basically the same as in embodiment 1, in this embodiment, a support member 54 is specifically provided, one end of which is fixedly connected to the first cylinder 1, and the other end of which is hinged to the third cylinder 53. The supporting piece 54 can be provided with a pin part, the supporting piece 54 is hinged with the third cylinder 53 by passing a screw rod through the pin part and fastening the screw rod through a nut, the other end of the supporting piece 54 is welded on the first cylinder 1, and the supporting piece 54 is fixed with the outer wall of the first cylinder 1 in a tangent way.
Example 4
In order to adapt to continuous granulation and pre-carbonization treatment of graphite cathode materials, through multiple tests and theoretical analysis, in the embodiment, according to the temperature distribution in the length direction of the rotary kiln body, the rotary kiln body is provided with a proper length, and then the rotary kiln is divided into a granulation coating area and a pre-carbonization area, wherein the granulation coating area is close to a material conveying part 7, and the pre-carbonization area is close to a material discharging part 8. The granulating and coating region and the pre-carbonizing region may be partitioned by the penetrating portion 5, or may not be partitioned by the penetrating portion 5. In the embodiment, the rotary kiln is divided into a granulating and cladding area and a pre-carbonizing area by taking the through part 5 as a partition, and the through part 5 is arranged at a deflection material outlet and is in the range of 1/2-2/3 of the length of the first cylinder body 1.
Referring to fig. 8 and 9, in this embodiment, the inner side wall of the first cylinder 1 located in the granulating and coating area is provided with the shoveling pieces 12, the shoveling pieces 12 are uniformly arranged along the circumferential direction of the inner side wall of the first cylinder 1, meanwhile, the shoveling pieces 12 are arranged at intervals along the axial direction of the first cylinder 1, two adjacent shoveling pieces 12 are arranged in a quincuncial staggered manner, and along the material conveying direction, the arrangement interval is larger and larger along with the increase of the material temperature. The pre-carbonization zone is not provided with a shoveling member 12.
The material-copying part 12 is of a flanging structure and comprises a first material-copying section 121 and a second material-copying section 122, wherein an included angle beta larger than 90 degrees is formed between the first material-copying section 121 and the second material-copying section 122, and the included angle beta is determined according to a material 10 repose angle and is generally 110-160 degrees. The height interval between the material shoveling piece 12 and the material layer is 5-30 mm, the first shoveling section 121 is connected with the inner side wall of the first cylinder body 1, an eccentric notch 123 is formed at the joint of the first shoveling section 121 and the first cylinder body 1, and the notch 123 is biased to the advancing direction of the material and forms a gap with the inner wall of the cylinder body so as to facilitate blanking. The design can simultaneously improve heat transfer efficiency, strengthen relative motion between materials and prevent three effects of dust emission.
Example 5
Referring to fig. 3, 4 and 7, in this embodiment, a diversion spiral 13 is disposed on the outer side wall of the first cylinder 1 before the middle support, the diversion spiral 13 is disposed along the axial direction of the first cylinder 1, and a plurality of first through holes 131 are formed on the outer side wall of the first cylinder 1 near the diversion spiral 13. The guide spiral not only strengthens the cylinder body, but also ensures the uniform circulation of the flue gas, uniformly heats the first cylinder body 1, ensures the uniform heating of materials, and ensures that the flue gas circulates along the outer side wall of the first cylinder body 1 as much as possible by the first through holes 131, thereby further improving the heat transfer effect. The middle support is a high temperature section, so that the diversion spiral 13 can be arranged, the diversion ring can be arranged, and the diversion structure can be omitted according to the actual process requirements.
Example 6
Referring to fig. 10 and 11, one end of the first cylinder 1 is provided with a driving portion 6, the driving portion 6 is provided with a main driving portion and an auxiliary driving portion, the main driving portion includes a first motor 61, a speed reducer 62, a coupling 63, a first driving gear 64 and a second driving gear 65, the second driving gear 65 is commonly called a large gear, the first driving gear 64 is commonly called a small gear and is meshed with the second driving gear 65, and the first motor 61 is sequentially connected with the speed reducer 62, the coupling 63 and the first driving gear 64 to further drive the first cylinder 1 to rotate. The auxiliary driving part comprises a second motor 66 and a driving clutch 68, the driving clutch 68 is also connected with the speed reducer 62, and when the main driving part stops running, the switching piece 67 controls the driving clutch 68, so that the auxiliary driving part cuts in and continuously drives the first cylinder 1 to rotate, thereby ensuring the stable running of the rotary kiln.
Example 7
Referring to fig. 1 and 10, one end of the first cylinder 1 is connected with the material conveying part 7, the material conveying part 7 comprises a spiral conveying part 71, the spiral conveying part 71 is connected with the first cylinder 1, a jacket 73 is arranged at the joint with the first cylinder 1, a protective gas source inlet 72 is arranged on the jacket 73, and a preheating protective gas (such as nitrogen) enters the kiln from the material feeding end to drive waste gas in the kiln, so that the whole kiln length is ensured to be in a nitrogen protection range, and on the other hand, the waste gas in the kiln is prevented from being condensed by cold nitrogen to be stained with a wall, so that improvement of thermal resistance after staining is avoided, and heat exchange efficiency is influenced.
The screw conveyor 71 may be a screw conveyor, which is connected with the feeding end of the first cylinder 1 in a sealing manner, and the first cylinder 1 is provided with a material guiding screw 11. The material guiding screw 11 is connected to the inner wall of the first cylinder 1, the height of the material guiding screw is 150-350 mm, and the number of screw plate heads is 4-8, so that the material can rapidly advance when entering the low temperature area of the rotary kiln, and rapidly enter the smoke heating area of the first cylinder 1.
Example 8
Referring to fig. 6, a sealing portion 9 is provided at the junction between the third cylinder 53 and the second cylinder 2. The seal 9 includes a second anchor 91, a first seal 92, a second seal 93, a third seal 94, a second screw 95, and a second nut 96. The second anchoring member 91 is fixed on the second cylinder 2, the first sealing member 92 is connected with the second anchoring member 91, the second sealing member 93 covers the joint of the third cylinder 53 and the second cylinder 2, and is an elastic member such as a seal spring piece, the second sealing member 93 is arranged in a lamination manner along the periphery of the second cylinder 2, the third sealing member 94 is arranged on the second sealing member 93, the first sealing member 92, the second sealing member 93 and the third sealing member 94 are fixed through the second screw rod 95 and the second nut 96, the third sealing member 94 is provided with a hook, and a counterweight can be arranged. By this sealing structure, the joint between the third cylinder 53 and the second cylinder 2 is securely sealed, and leakage is prevented.
Example 9
For the granulating and pre-carbonizing procedures of the graphite cathode material of the lithium battery, the hot ladle kettle and the cooling kettle are intermittent equipment, the production efficiency is low, the tunnel kiln is also a static heating type, the materials are heated unevenly, and the continuous granulating and pre-carbonizing continuous processing of the graphite cathode material can be realized by utilizing the continuous production type rotary kiln.
Specifically, the pretreated material enters the rotary kiln material conveying part 7 through the feeding conveying system, the rotary kiln material conveying part 7 conveys the material into the first barrel 1, the rotary kiln belongs to an external heating rotary kiln, high-temperature flue gas enters a flue gas channel of the rotary kiln through the heat source inlet 21, the heat source inlet 21 is provided with a heat source uniform distribution device, the heat source indirectly contacts and exchanges heat with the material in the first barrel 1 in a countercurrent manner, the material is granulated in a middle temperature section of the rotary kiln, the high temperature section is pre-carbonized, the material after pre-carbonization flows out through a discharging opening of a rear-section discharging part 8 of the rotary kiln, and waste gas generated in the granulating and pre-carbonization process is discharged through a waste gas outlet on the rear-section discharging part 8, so that the continuity of the material from feeding, granulating and pre-carbonization to discharging is realized.
Claims (10)
1. A continuous production rotary kiln, characterized in that: the device comprises a first barrel (1), a second barrel (2) and a through part (5), wherein the second barrel (2) is provided with at least 2 sections, the through part (5) is arranged between two adjacent sections of second barrels (2), the first barrel (1) penetrates through the second barrel (2) and the through part (5), and a continuous channel is formed between the first barrel (1) and the second barrel (2) and between the first barrel and the through part (5); the rotary kiln is divided into at least 2 treatment areas, and different procedures of production are completed in different treatment areas; the first cylinder (1) rotates in linkage with the through part (5).
2. A continuous production rotary kiln according to claim 1, wherein: the through part (5) comprises a third cylinder body (53) and supporting pieces (54), the supporting pieces (54) are arranged in a plurality along the circumferential direction of the first cylinder body (1), one end of each supporting piece (54) is connected with the first cylinder body (1), and the other end of each supporting piece is connected with the third cylinder body (53).
3. A continuous production rotary kiln according to claim 2, wherein: one end of the supporting piece (54) is fixedly connected with the first cylinder body (1), and the other end of the supporting piece is hinged with the third cylinder body (53).
4. A continuous production rotary kiln according to any one of claims 1 to 3, wherein: the second cylinder (2) and the through part (5) form an outer cylinder, one end of the outer cylinder is provided with a heat source inlet (21), the other end of the outer cylinder is provided with a heat source outlet (22), the heat source inlet (21) is close to the discharging part (8), the heat source outlet (22) is close to the conveying part (7), and the heat source inlet (21) is communicated with the heat source outlet (22) through the channel.
5. A continuous production rotary kiln according to claim 4, wherein: the rotary kiln is divided into a granulating and cladding area and a pre-carbonizing area, wherein the granulating and cladding area is close to the material conveying part (7), and the pre-carbonizing area is close to the material discharging part (8).
6. A continuous production rotary kiln according to claim 5, wherein: the inner side wall of the first barrel (1) in the granulating and coating area is provided with a shoveling piece (12), the shoveling piece (12) comprises a first shoveling section (121) and a second shoveling section (122), the first shoveling section (121) is connected with the inner side wall of the first barrel (1), and a notch (123) is formed at the joint of the first shoveling section (121) and the first barrel (1).
7. A continuous production rotary kiln according to claim 5, wherein: the outer side wall of the first barrel (1) is provided with a diversion spiral (13), the diversion spiral (13) is arranged along the axial direction of the first barrel (1), and a plurality of first through holes (131) are formed in the part, close to the outer side wall of the first barrel (1), of the diversion spiral (13).
8. A continuous production rotary kiln according to claim 4, wherein: the two ends of the first cylinder body (1) extending out of the second cylinder body (2) are respectively provided with a first supporting part and a second supporting part, and the through part (5) is provided with a third supporting part.
9. A continuous production rotary kiln according to claim 4, wherein: a jacket (73) is arranged at the joint of the material conveying part (7) and the first cylinder body (1), and a protective air source inlet (72) is arranged on the jacket (73).
10. A method for continuous processing of materials using a rotary kiln according to any one of claims 1 to 9, characterized in that: and conveying the materials into a first cylinder (1) of the rotary kiln, enabling a heat source to enter the channel through a heat source inlet (21), enabling the heat source to indirectly contact and exchange heat with the materials in the first cylinder (1) in a countercurrent mode, and outputting the materials after different technological treatments are carried out in different treatment areas of the rotary kiln.
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| CN202211088081.6A CN117704788A (en) | 2022-09-07 | 2022-09-07 | Continuous production type rotary kiln and material continuous processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118066847A (en) * | 2024-04-24 | 2024-05-24 | 苏州中材非金属矿工业设计研究院有限公司 | Novel process for realizing granulation and pre-carbonization integrated production by adopting rotary kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118066847A (en) * | 2024-04-24 | 2024-05-24 | 苏州中材非金属矿工业设计研究院有限公司 | Novel process for realizing granulation and pre-carbonization integrated production by adopting rotary kiln |
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