Rotary kiln and lithium battery recovery processing equipment

Abstract

The embodiment of the utility model provides a rotary kiln and lithium battery recovery processing equipment, and the rotary kiln comprises a rotary cylinder body which is internally used for loading materials; the rotary cylinder is sleeved with the heating furnace, an air inlet is formed in the peripheral face of the heating furnace and used for inputting high-temperature gas into the heating furnace, the air inlet is connected with an air inlet channel, the extending direction of the air inlet channel is staggered from the direction of the connecting line from the center of the air inlet to the center of the rotary cylinder, and the high-temperature gas can exchange heat with the rotary cylinder; and the material in the rotary cylinder is heated. According to the rotary kiln, the extending direction of the gas inlet channel is staggered from the direction of the connecting line from the center of the gas inlet to the center of the rotary cylinder, and high-temperature gas can flow along the periphery of the rotary cylinder after entering the heating furnace through the gas inlet channel, so that the high-temperature gas can uniformly and stably exchange heat with the rotary cylinder, and the heating effect is guaranteed; and overheating or poor heating of the materials can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotary kiln, in particular to a rotary kiln and a lithium battery recycling device. BACKGROUND

[0002] With the rapid development of new energy technology, the amount of lithium batteries on the market is increasing. After the lithium battery reaches the service life, the lithium battery needs to be retired and recycled. In the recycling process of the retired lithium battery, the battery is crushed and transported to the inside of the rotary kiln for heating.

[0003] At present, the common rotary kiln mainly uses electric heating, and there are few hot air indirect heating. In the existing hot air indirect heating mode, the material is prone to overheating or poor heating, so it needs to be further improved. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a rotary kiln and a lithium battery recycling device, which can avoid overheating or poor heating of the material and ensure the heating effect.

[0005] In a first aspect, the present application provides a rotary kiln, comprising:

[0006] A rotary cylinder, the inside of the rotary cylinder is used to load material;

[0007] A heating furnace is arranged outside the rotary cylinder, the outer periphery of the heating furnace is provided with an air inlet, the air inlet is used to input high-temperature gas into the inside of the heating furnace, the air inlet is connected with an air inlet channel, the extension direction of the air inlet channel is deviated from the direction of the line connecting the center of the air inlet to the center of the rotary cylinder, and the high-temperature gas can exchange heat with the rotary cylinder to heat the material in the inside of the rotary cylinder.

[0008] In some embodiments, the air inlet channel is arranged along the tangent direction of the outer periphery of the heating furnace.

[0009] In some embodiments, the outer periphery of the heating furnace is further provided with an air outlet, the air outlet is used to discharge the heat-exchanged gas to the outside, the air outlet is connected with an air outlet channel, and the air outlet channel is arranged along the tangent direction of the outer periphery of the heating furnace.

[0010] In some embodiments, the air inlet channel is arranged on the side of the heating furnace along the horizontal direction, and the air outlet channel is arranged on the side of the heating furnace along the horizontal direction.

[0011] In some embodiments, the air inlet is arranged in the lower half of the heating furnace, and the air outlet is arranged in the upper half of the heating furnace.

[0012] In some embodiments, the air inlet and the air outlet are arranged in a horizontal direction.

[0013] In some embodiments, the air inlet is a plurality of air inlets, and the plurality of air inlets are arranged at intervals.

[0014] The air outlet is a plurality of air outlets, and the plurality of air outlets are arranged at intervals.

[0015] In some embodiments, the heating furnace comprises a plurality of sequentially connected sections, and a separation structure is arranged between each two adjacent sections, each section is provided with at least one air inlet and at least one air outlet, and the temperature of the high-temperature gas input into different sections is different.

[0016] In some embodiments, the inner wall of the heating furnace is provided with a flow guide plate, the flow guide plate is perpendicular to the central axis of the heating furnace, and the flow guide plate is close to the air inlet.

[0017] In a second aspect, the embodiments of the present application provide a lithium battery recycling device, which comprises:

[0018] A rotary cylinder is arranged inside the rotary cylinder for loading the broken recycled lithium batteries.

[0019] A heating furnace is arranged outside the rotary cylinder, and the outer circumferential surface of the heating furnace is provided with an air inlet for inputting high-temperature gas into the heating furnace. The air inlet is connected with an air inlet channel, the extension direction of the air inlet channel is different from the direction of the line connecting the center of the air inlet with the center of the rotary cylinder, and the high-temperature gas can exchange heat with the rotary cylinder to heat the broken recycled lithium batteries.

[0020] The rotary kiln of the embodiments of the present application is characterized in that the extension direction of the air inlet channel is different from the direction of the line connecting the center of the air inlet with the center of the rotary cylinder, so that the high-temperature gas can flow along the outer periphery of the rotary cylinder after entering the heating furnace from the air inlet channel, the high-temperature gas can uniformly and stably exchange heat with the rotary cylinder, and the heating effect is ensured. Compared with the air inlet from the lower part of the heating furnace, the arrangement of the air inlet channel and the air inlet can avoid the high-temperature gas directly entering the material, so that the material can be prevented from being overheated. Compared with the air inlet from the upper part of the heating furnace, the arrangement of the air inlet channel and the air inlet can increase the contact area and contact time of the high-temperature gas and the material, so that the material can be prevented from being heated poorly. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 A structure schematic diagram of the rotary kiln of the embodiments of the present application.

[0023] Figure 2 A structure schematic diagram of the rotary kiln of the embodiments of the present application. Figure 1

[0024] Figure 3 A structure schematic diagram of the rotary kiln of the embodiments of the present application. Figure 2

[0025] Figure 4 A structure schematic diagram of the rotary kiln of the embodiments of the present application. Figure 1

[0026] Figure 5 A first layout schematic diagram of the gas inlet of the heating furnace of the rotary kiln of the embodiments of the present application.

[0027] Figure 6 A second layout schematic diagram of the gas inlet of the heating furnace of the rotary kiln of the embodiments of the present application.

[0028] Figure 7 A layout schematic diagram of the gas inlet and the gas outlet of the heating furnace of the rotary kiln of the embodiments of the present application.

[0029] Figure 8 A structure schematic diagram of the rotary kiln of the embodiments of the present application.

[0030] Figure 9 A structure schematic diagram of the rotary kiln system of the embodiments of the present application.

[0031] Explanation of reference signs:

[0032] 100-rotary kiln; 200-rotary kiln system; 300-main pipeline;

[0033] 10-feeding device; 20-gas conveying device; 30-sealing device; 40-rotary cylinder; 50-heating furnace; 60-skid;

[0034] ​​​11 - first housing; 21 - second housing; 22 - first flange; 31 - sealing portion; 311 - first side of the sealing portion; 312 - second side of the sealing portion; 32 - third housing; 33 - second flange; 41 - feed end; 42 - discharge end; 51 - gas inlet; 51a - gas inlet channel; 52 - gas outlet; 52a - gas outlet channel; 53 - deflector; 54 - section of the heating furnace; 55 - partition structure; L - central axis of the heating furnace. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0036] The embodiments of the present application provide a rotary kiln, which can be used for heating materials and realizing pyrolysis of the materials. For example, in actual application, the rotary kiln can be used as a lithium battery recycling device and applied to lithium battery recycling to pyrolyze crushed lithium batteries. It should be noted that in addition to being applied to lithium battery recycling, the rotary kiln of the embodiments of the present application can also be applied to other fields to pyrolyze other materials, which is not limited by the present application.

[0037] Reference Figures 1 to 3 , Figure 1 FIG. 1 is a structural schematic diagram of a rotary kiln 100 provided by the embodiments of the present application, Figure 2 FIG. 2 is a front view of the rotary kiln 100 shown in FIG. 1, Figure 1 FIG. 3 is a partial enlarged schematic view of the rotary kiln 100 shown in FIG. 1. Figure 3 FIG. 4 is a partial enlarged schematic view of the rotary kiln 100 shown in FIG. 1. Figure 2

[0038] The rotary kiln 100 includes a feeding device 10, a gas conveying device 20, a sealing device 30, a rotary cylinder 40, a heating furnace (or heating furnace chamber) 50, and a skid 60.

[0039] The rotary cylinder 40 is internally used for loading materials, and the materials are pyrolyzed after being heated. For example, the rotary cylinder 40 can be used for loading crushed recycled lithium batteries to pyrolyze the lithium batteries. The rotary cylinder 40 includes a feed end 41 and a discharge end 42, and both the feed end 41 and the discharge end 42 have openings. The feed end 41 is used for inputting materials into the rotary cylinder 40, and the discharge end 42 is used for discharging products after pyrolysis of the materials to the outside.

[0040] ​The feeding device 10 is mounted on the skid 60, which can be used to support the feeding device 10. The feeding device 10 has a material inlet and a material outlet. The material inlet is used to add materials, such as crushed recycled lithium batteries, into the feeding device 10. In practical applications, the material inlet can be in the form of a funnel. The feeding device 10 is connected to the rotary cylinder 40, and the material outlet of the feeding device 10 extends into the opening of the feeding end 41 of the rotary cylinder 40, which is used to input materials, such as crushed recycled lithium batteries, into the interior of the rotary cylinder 40.

[0041] The gas delivery device 20 is arranged on the feeding device 10. The gas delivery device 20 is used to input a protective gas into the interior of the rotary cylinder 40 to ensure an anaerobic environment in the interior of the rotary cylinder 40. In practical applications, the protective gas can be nitrogen or other inert gases.

[0042] In some embodiments, referring to Figure 4 , Figure 4 is Figure 1 a partial internal structure diagram of the rotary kiln 100.

[0043] The feeding device 10 includes a first shell 11. In practical applications, the first shell 11 can be in the form of a ring, so that the material conveying part of the feeding device 10 is in the form of a column as a whole. The gas delivery device 20 includes a second shell 21. The second shell 21 is provided with a gas inlet, which is used to input the protective gas, such as nitrogen.

[0044] The second shell 21 is arranged on the outer periphery of the first shell 11. The first gas passage is formed between the second shell 21 and the first shell 11, and the first gas passage is in communication with the interior of the rotary cylinder 40. It can be understood that the first gas passage is a thin gap formed between the second shell 21 and the first shell 11. Therefore, the protective gas input by the gas inlet of the second shell 21 can be delivered to the interior of the rotary cylinder 40 through the first gas passage.

[0045] In some embodiments, the second shell 21 and the first shell 11 are formed as an integral structure. Therefore, the combination of the feeding function and the gas delivery function can be achieved by one structure, so that the structure of the feeding device 10 and the gas delivery device 20 is more compact and simplified, which is convenient for production and manufacturing, and simplifies the overall structural design of the rotary kiln 100. In addition, the second shell 21 and the first shell 11 are formed as an integral structure, which is also convenient for achieving good sealing between the second shell 21 and the first shell 11.

[0046] Continuing to refer to Figures 1 to 3The sealing device 30 is connected with the feeding device 10 and the feeding end 41 of the rotary drum 40, and is used for sealing the gap between the rotary drum 40 and the feeding device 10. It can be understood that the materials in the rotary drum 40 are easy to produce toxic gas in the process of pyrolysis, and therefore the sealing of the rotary drum 40 needs to be ensured to avoid leakage of toxic gas. The sealing device 30 can seal the gap between the rotary drum 40 and the feeding device 10, and can realize good sealing of the rotary drum 40 without affecting the material conveying function of the feeding device 10.

[0047] In some embodiments, continuing to refer to Figure 4 The sealing device 30 comprises a sealing part 31 and a third shell 32. The sealing part 31 is annular. The sealing part 31 comprises opposite first and second sides 311 and 312, the first side 311 being connected with the third shell 32, and the second side 312 being connected with the feeding end 41 of the rotary drum 40. The third shell 32 is connected with the second shell 21 of the gas conveying device 20, so as to indirectly connect the third shell 32 with the first shell 11 of the feeding device 10, that is, indirectly connect the sealing device 30 with the feeding device 10. It can be understood that the second shell 21 is sleeved on the outer periphery of the first shell 11, and the third shell 32 is connected with the second shell 21, so the third shell 32 is also sleeved on the outer periphery of the first shell 11.

[0048] The third shell 32 and the first shell 11 form a second gas passage therebetween, and the second gas passage is in communication with the first gas passage and the interior of the rotary drum 40. It can be understood that the second gas passage is a thin gap formed between the third shell 32 and the first shell 11. Therefore, the protective gas input by the gas inlet of the second shell 21 can be conveyed to the interior of the rotary drum 40 through the first gas passage and the second gas passage. It should be noted that the first gas passage and the second gas passage are only for description, and in actual application, the first gas passage and the second gas passage are not clearly separated.

[0049] In some embodiments, as shown in Figure 4 The gas conveying device 20 further comprises a first flange 22. The second shell 21 is connected with the first flange 22. The sealing device 30 further comprises a second flange 33. The third shell 32 is connected with the second flange 33. The first flange 22 is connected with the second flange 33, so as to connect the third shell 32 with the second shell 21 and realize good sealing therebetween.

[0050] The rotary kiln 100 of the embodiment of the present application is provided with the gas conveying device 20 arranged at the feeding device 10 and used for inputting the protective gas into the rotary cylinder 40, and the sealing device 30 connected with the feeding device 10 and the feeding end 41 of the rotary cylinder 40 and used for sealing the gap between the rotary cylinder 40 and the feeding device 10, so that the feeding device 10, the gas conveying device 20 and the sealing device 30 can be combined together, and compared with the independent arrangement of each device, the overall structure of the rotary kiln 100 can be more compact, the volume of the rotary kiln 100 can be reduced, and the installation space can be saved.

[0051] In some embodiments, continuing to refer to Figures 1 to 3 The heating furnace 50 is arranged outside the rotary cylinder 40. The inside of the heating furnace 50 is used for inputting the high-temperature gas (hot air), and the high-temperature gas can exchange heat with the rotary cylinder 40 to heat the material in the rotary cylinder 40, so that the material can be indirectly heated by the high-temperature gas to realize pyrolysis of the material. In actual application, the temperature of the high-temperature gas can be set according to actual requirements. For example, in one feasible example, the temperature of the high-temperature gas can be 300-600°C.

[0052] In actual application, the high-temperature gas can be generated externally, for example, high-temperature flue gas generated by fuel combustion is conveyed into the inside of the heating furnace 50 through a pipeline. It can be understood that the fuel combustion to generate the high-temperature flue gas is only one feasible implementation manner of generating the high-temperature gas, and other ways can also be adopted to generate the high-temperature gas, and the original source of the high-temperature gas is not specifically limited in the embodiment of the present application.

[0053] In some embodiments, the outer peripheral surface of the heating furnace 50 is provided with the gas inlet 51 and the gas outlet 52. The gas inlet 51 is used for inputting the high-temperature gas into the inside of the heating furnace 50, for example, the gas inlet 51 can be connected to the gas source of the external high-temperature gas through a pipeline. The gas outlet 52 is used for discharging the heat-exchanged gas to the outside.

[0054] It can be understood that the gas discharged from the gas outlet 52 can be directly discharged to the external environment, can be returned to the gas source of the external high-temperature gas for recycling, or can be conveyed to other production links for further use, and the final destination of the gas discharged from the gas outlet 52 is not specifically limited in the present application.

[0055] In some embodiments, the gas inlet 51 is connected with a gas inlet channel connected with the external gas source. The extension direction of the gas inlet channel is deviated from the direction of the line connecting the center of the gas inlet 51 to the center of the rotary cylinder 40. That is, the extension direction of the gas inlet channel is not directly opposite to the center of the rotary cylinder 40. In some embodiments, the gas inlet channel is arranged along the tangent direction of the outer peripheral surface of the heating furnace 50.

[0056] Understandably, the extension direction of the air inlet channel is offset from the direction of the line connecting the center of the air inlet 51 to the center of the rotating cylinder 40. Therefore, after the high-temperature gas enters the heating furnace 50 through the air inlet channel, it can flow along the outer periphery of the rotating cylinder 40, allowing the high-temperature gas to exchange heat with the rotating cylinder 40 evenly and stably, ensuring the heating effect. Compared to air intake from the bottom of the heating furnace 50, the arrangement of the air inlet channel and air inlet 51 avoids the high-temperature gas from directly entering the material, thus preventing overheating of the material. Compared to air intake from the top of the heating furnace 50, the arrangement of the air inlet channel and air inlet 51 increases the contact area and contact time between the high-temperature gas and the material, thus preventing inadequate heating of the material.

[0057] In some embodiments, the air outlet 52 is connected to an air outlet channel. For example, the air outlet channel may be arranged along the tangential direction of the outer peripheral surface of the heating furnace 50.

[0058] In some embodiments, such as Figure 1 As shown, the air inlet channel and the air outlet channel are both horizontally located on the side of the heating furnace 50. This arrangement of the air inlet and outlet channels ensures good heating performance and prevents overheating or inadequate heating of the material.

[0059] In some embodiments, reference Figure 5 , Figure 5 This is a schematic diagram of a first layout of the air inlet of the rotary kiln heating furnace 50 according to an embodiment of this application. The heating furnace 50 has a central axis L. The orthographic projection of the air inlet 51 in the vertical plane is located below the central axis L of the heating furnace, that is, the air inlet 51 is located in the lower half of the heating furnace 50. The central axis L of the heating furnace 50 is located in this vertical plane. Figure 5 As shown, the air inlet 51 is connected to the air inlet channel 51a, and the extension direction of the air inlet channel 51a is offset from the direction of the line connecting the center of the air inlet 51 to the center of the rotating cylinder 40. The high-temperature gas input through the air inlet 51 flows in the direction shown by the dashed arrow in the figure.

[0060] In some embodiments, reference Figure 6 , Figure 6 This is a schematic diagram of a second layout of the air inlet of the rotary kiln heating furnace 50 according to an embodiment of this application. The air inlet 51 is connected to the air inlet channel 51a, and the extending direction of the air inlet channel 51a is offset from the direction of the line connecting the center of the air inlet 51 to the center of the rotary cylinder 40. The high-temperature gas input through the air inlet 51 flows in the direction shown by the dashed arrow in the figure. Figure 6 In the example shown, the air inlet 51 can be located in the upper half of the heating furnace 50.

[0061] In some embodiments, reference Figure 7 , Figure 7This is a schematic diagram showing the layout of the air inlet and outlet of the rotary kiln heating furnace 50 according to an embodiment of this application. The air inlet 51, projected vertically, is located below the central axis L of the heating furnace, and the air outlet 52, projected vertically, is located above the central axis L of the heating furnace. That is, the air inlet 51 is located in the lower half of the heating furnace 50, and the air outlet 52 is located in the upper half of the heating furnace 50. Figure 7 As shown, the high-temperature gas input through the air inlet 51 flows in the direction indicated by the dashed arrow in the figure and is discharged from the air outlet 52.

[0062] It should be noted that the central axis L mentioned above is only for the purpose of illustrating the technical solution of this application. In the actual structure of the heating furnace 50, there is no such structure as the central axis L.

[0063] In some embodiments, such as Figure 1 As shown, the orthographic projection of the air inlet 51 on the horizontal plane and the orthographic projection of the air outlet 52 on the horizontal plane of the heating furnace 50 are offset. That is, the air inlet 51 and the air outlet 52 are offset along the horizontal direction. This arrangement of the air inlet 51 and the air outlet 52 can prevent the high-temperature gas input through the air inlet 51 from being directly discharged through the air outlet 52, and can promote the high-temperature gas to form a spiral flow pattern inside the heating furnace 50, so that the high-temperature gas can fully contact the rotating cylinder 40 and improve the heat utilization rate of the high-temperature gas heating.

[0064] In some embodiments, reference Figure 8 , Figure 8 This is a schematic diagram of the internal structure of the rotary kiln heating furnace 50 according to an embodiment of this application. A guide plate 53 is provided on the inner wall of the heating furnace 50. The guide plate 53 is perpendicular to the central axis L of the heating furnace 50 and is located near the air inlet 51. The size of the guide plate 53 can be set according to actual needs. It is understood that by providing the guide plate 53, the high-temperature gas input through the air inlet 51 can be prevented from directly exiting through the air outlet 52 without heat exchange with the rotary cylinder 40. Furthermore, the high-temperature gas can form a spiral flow pattern with the help of the guide plate 53, ensuring sufficient contact between the high-temperature gas and the rotary cylinder 40, thereby improving the heat utilization rate of the high-temperature gas heating.

[0065] In some embodiments, the heating furnace 50 has multiple air inlets 51, which are spaced apart; and / or multiple air outlets 52, which are spaced apart. It is understood that by providing multiple air inlets 51 and / or multiple air outlets 52, compared to a single air inlet and a single air outlet, the input and / or discharge speeds of high-temperature gas can be accelerated. Therefore, the flow efficiency of high-temperature gas inside the heating furnace 50 can be improved, the heat exchange efficiency between the high-temperature gas and the rotating cylinder 40 can be increased, and a good heating effect can be ensured.

[0066] In some embodiments, such asFigure 8 As shown in FIG. 1, the heating furnace 50 includes a plurality of sequentially connected sections 54. A partition structure 55 is arranged between each two adjacent sections 54. The partition structure 55 may, for example, be a partition plate. Each section 54 is provided with at least one gas inlet 51 and at least one gas outlet 52. The high-temperature gas input into different sections 54 has different temperatures. Therefore, a plurality of sections 54 can be arranged according to different heating requirements, each section 54 forms a different temperature zone, and the different temperature zones are separated from each other by the partition structures 55, so that the heating furnace 50 can be divided into a plurality of temperature zones that are independent of and do not affect each other, to meet the different heating requirements of different process sections and avoid the high-temperature gas in each temperature zone from affecting each other.

[0067] The embodiments of the present application also provide a rotary kiln system. In actual application, the rotary kiln system can be used as a lithium battery recycling system and applied to lithium battery recycling to pyrolyze the crushed lithium batteries.

[0068] Reference Figure 9 , Figure 9 FIG. 2 is a structural schematic diagram of a rotary kiln system 200 according to an embodiment of the present application. The rotary kiln system 200 includes a plurality of sequentially connected rotary kilns. Each rotary kiln can be the rotary kiln 100 in the above embodiments, for example Figure 9 As shown in FIG. 2, the rotary kiln system 200 includes two rotary kilns 100. The heating temperature required in each rotary kiln is different, which can meet the heating requirements of different process sections.

[0069] The gas outlet 52 of the heating furnace 50 of one rotary kiln 100 is connected to the gas inlet 51 of the heating furnace 50 of another rotary kiln 100, so that the gas discharged from the gas outlet 52 flows into the gas inlet 51. It can be understood that the gas discharged from the gas outlet 52 of the heating furnace 50 still has a certain temperature, and therefore the gas discharged from the gas outlet 52 of one heating furnace flows into the gas inlet 51 of another heating furnace, which can heat the materials in another rotary kiln again, can fully utilize the heat energy of the gas, and improve the overall heat energy utilization rate of the rotary kiln.

[0070] For example, in actual application, the high-temperature gas can be first input into the rotary kiln 100 with higher heating temperature requirement to heat the materials, and then flow into the rotary kiln 100 with lower heating temperature requirement to heat the materials, so as to fully utilize the high-temperature gas and improve the overall heat energy utilization rate.

[0071] In some embodiments, as shown in FIG. 3, the rotary kiln system 200 includes a plurality of rotary kilns 100 connected in series. The gas outlet 52 of the heating furnace 50 of one rotary kiln 100 is connected to the gas inlet 51 of the heating furnace 50 of another rotary kiln 100, so that the gas discharged from the gas outlet 52 flows into the gas inlet 51. Figure 9As shown, the rotary kiln system 200 further comprises a main pipeline 300. The gas outlet 52 of the heating furnace 50 of one rotary kiln 100 is connected with the gas inlet 51 of the heating furnace 50 of another rotary kiln 100 through the main pipeline 300, so that the gas discharged from the gas outlet 52 can flow into the gas inlet 51 of the heating furnace of another rotary kiln through the main pipeline 300. The main pipeline 300 is in communication with a bypass pipeline, and the bypass pipeline is used to input high-temperature gas and / or normal-temperature gas into the main pipeline 300. By inputting high-temperature gas and / or normal-temperature gas into the main pipeline 300 through the bypass pipeline, the temperature of the gas flowing in the main pipeline 300 can be adjusted. For example, when the required heating temperature of the next-stage rotary kiln 100 is required to be high, high-temperature gas can be input into the main pipeline 300 through the bypass pipeline to increase the temperature of the gas in the main pipeline 300; when the required heating temperature of the next-stage rotary kiln 100 is required to be low, normal-temperature gas can be input into the main pipeline 300 through the bypass pipeline to decrease the temperature of the gas in the main pipeline 300.

[0072] In some embodiments, an adjusting valve is arranged on the bypass pipeline to adjust the flow of the gas in the bypass pipeline. It can be understood that by adjusting the flow of the gas in the bypass pipeline, for example, adjusting the flow of high-temperature gas or normal-temperature gas, the temperature of the gas in the main pipeline 300 can be further adjusted, and the temperature adjustment is more flexible.

[0073] In some embodiments, the rotary kiln system 200 comprises a first-stage rotary kiln 100 and a second-stage rotary kiln 100, and the material discharged from the rotary cylinder of the first-stage rotary kiln 100 is input into the rotary cylinder of the second-stage rotary kiln 100. That is, the first-stage rotary kiln 100 is located upstream of the material conveying direction, and the second-stage rotary kiln 100 is located downstream of the material conveying direction. The gas outlet of the heating furnace of the first-stage rotary kiln 100 is connected with the gas inlet of the heating furnace of the second-stage rotary kiln 100, that is, the gas outlet of the heating furnace located upstream of the material conveying direction is connected with the gas outlet of the heating furnace located downstream of the material conveying direction; or the gas outlet of the heating furnace of the second-stage rotary kiln 100 is connected with the gas inlet of the heating furnace of the first-stage rotary kiln 100, that is, the gas outlet of the heating furnace located downstream of the material conveying direction is connected with the gas outlet of the heating furnace located upstream of the material conveying direction.

[0074] It can be understood that in actual application, the heating temperature required by each stage of the rotary kiln 100 of the rotary kiln system 200 is different, and it is possible that the heating temperature required by the rotary kiln 100 upstream of the material conveying direction is higher than the heating temperature required by the rotary kiln 100 downstream, that is, the heating temperature required by the rotary cylinder of the first stage rotary kiln 100 is higher than the heating temperature required by the rotary cylinder of the second stage rotary kiln 100; it is also possible that the heating temperature required by the rotary kiln 100 downstream of the material conveying direction is higher than the heating temperature required by the rotary kiln 100 upstream, that is, the heating temperature required by the rotary cylinder of the second stage rotary kiln 100 is higher than the heating temperature required by the rotary cylinder of the first stage rotary kiln 100. Therefore, in the rotary kiln system 200 of the embodiment of the present application, the material flow direction and the gas flow direction between the first stage rotary kiln 100 and the second stage rotary kiln 100 are not necessarily the same, and by setting different connection modes between the heating furnaces of the upstream rotary kiln and the downstream rotary kiln, different heating process requirements can be met, so that the setting of the rotary kiln system 200 is more flexible.

[0075] In the description of the present application, it should be understood that terms such as "first", "second" are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0076] The principles and implementation modes of the present application are described by applying specific examples in the present application, and the above description of the examples is only for the purpose of helping to understand the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will have changes, and the above description of the present application should not be understood as limiting the present application.

Claims

1. A rotary kiln characterized by, The rotary kiln comprises: a rotary cylinder, an interior of which is used for loading materials; a heating furnace, which is sleeved outside the rotary cylinder, an outer peripheral surface of the heating furnace is provided with an air inlet, the air inlet is used for inputting high-temperature gas into an interior of the heating furnace, the air inlet is connected with an air inlet channel, an extension direction of the air inlet channel is deviated from a direction of a line connecting a center of the air inlet to a center of the rotary cylinder, the high-temperature gas can exchange heat with the rotary cylinder to heat the materials in the interior of the rotary cylinder.

2. A rotary kiln according to claim 1, characterised in that The air inlet channel is arranged along a tangent direction of the outer peripheral surface of the heating furnace.

3. The rotary kiln according to claim 1, wherein: the outer peripheral surface of the heating furnace is further provided with an air outlet, the air outlet is used for discharging the heat-exchanged gas to the outside, the air outlet is connected with an air outlet channel, the air outlet channel is arranged along a tangent direction of the outer peripheral surface of the heating furnace.

4. A rotary kiln according to claim 3, characterised in that The air inlet channel is arranged along a horizontal direction at a side of the heating furnace, and the air outlet channel is arranged along a horizontal direction at a side of the heating furnace.

5. The rotary kiln according to claim 3, wherein: the air inlet is arranged in a lower half of the heating furnace, and the air outlet is arranged in an upper half of the heating furnace.

6. The rotary kiln according to claim 3, wherein: the air inlet and the air outlet are arranged in a deviated manner along a horizontal direction.

7. The rotary kiln according to claim 3, wherein: the air inlet is a plurality of air inlets, and the plurality of air inlets are arranged in a spaced manner; and / or the air outlet is a plurality of air outlets, and the plurality of air outlets are arranged in a spaced manner.

8. The rotary kiln according to claim 7, wherein: the heating furnace comprises a plurality of sections connected in sequence, a separation structure is arranged between each two adjacent sections, each section is provided with at least one air inlet and at least one air outlet, and the high-temperature gas input into different sections has different temperatures.

9. The rotary kiln according to any one of claims 1 to 8, wherein: an inner wall of the heating furnace is provided with a flow guide plate, the flow guide plate is perpendicular to a central axis of the heating furnace, and the flow guide plate is close to the air inlet.

10. A lithium battery recycling processing apparatus, characterized by, The rotary kiln comprises: a rotary cylinder, an interior of which is used for loading broken recycled lithium batteries; a heating furnace, which is sleeved outside the rotary cylinder, an outer peripheral surface of the heating furnace is provided with an air inlet, the air inlet is used for inputting high-temperature gas into an interior of the heating furnace, the air inlet is connected with an air inlet channel, an extension direction of the air inlet channel is deviated from a direction of a line connecting a center of the air inlet to a center of the rotary cylinder, the high-temperature gas can exchange heat with the rotary cylinder to heat the broken recycled lithium batteries.

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