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 which comprises a feeding end, and the feeding end is provided with an opening; a material outlet of the feeding device extends into the opening, and the feeding device is used for inputting materials into the rotary barrel; the gas conveying device is arranged on the feeding device and used for inputting protective gas into the rotary barrel; and the sealing device is connected with the feeding device and the feeding end and is used for sealing a gap between the rotary barrel and the feeding device. According to the rotary kiln, the feeding device, the gas conveying device and the sealing device can be combined together, and compared with independent arrangement of all the devices, the overall structure of the rotary kiln can be more compact, the size of the rotary kiln is reduced, and the installation space is saved.

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.

[0003] In the recycling process of the retired lithium battery, the battery is crushed and transported to the inside of the rotary kiln through the feeding device for heating. During the heating process, the battery will produce flammable and toxic gas, and nitrogen needs to be continuously introduced into the inside of the rotary kiln to ensure a safe and anaerobic environment, and the rotary kiln needs to have good sealing performance.

[0004] Therefore, how to reasonably design each part of the rotary kiln is a problem that the rotary kiln field continues to face. Practical new type content

[0005] The embodiments of the present application provide a rotary kiln and a lithium battery recycling device, which can reduce the volume of the rotary kiln and save installation space.

[0006] In a first aspect, the embodiments of the present application provide a rotary kiln, comprising:

[0007] A rotary cylinder, the rotary cylinder comprises a feeding end, the feeding end has an opening;

[0008] A feeding device, the material outlet of the feeding device extends into the opening, for inputting material into the inside of the rotary cylinder;

[0009] A gas conveying device is arranged on the feeding device, for inputting protective gas into the inside of the rotary cylinder;

[0010] A sealing device is connected with the feeding device and the feeding end, for sealing the gap between the rotary cylinder and the feeding device.

[0011] In some embodiments, the feeding device comprises a first shell, the gas conveying device comprises a second shell, the second shell is provided with a gas inlet for inputting the protective gas;

[0012] The second shell is sleeved on the outer periphery of the first shell, a first gas passage is formed between the second shell and the first shell, and the first gas passage is in communication with the inside of the rotary cylinder.

[0013] In some embodiments, the second shell and the first shell are formed as an integral structure.

[0014] In some embodiments, the sealing device comprises a sealing part and a third shell, the sealing part is annular, the sealing part comprises opposite first and second sides, the first side is connected with the third shell, and the second side is connected with the feed end;

[0015] The third shell is connected with the second shell, and a second gas passage is formed between the third shell and the first shell, which is in communication with the first gas passage and the interior of the rotary cylinder.

[0016] In some embodiments, the gas conveying device further comprises a first flange, and the second shell is connected to the first flange;

[0017] The sealing device further comprises a second flange, and the third shell is connected to the second flange;

[0018] The first flange is connected with the second flange.

[0019] In some embodiments, the rotary kiln further comprises:

[0020] A heating furnace is sleeved outside the rotary cylinder, and the interior of the heating furnace is used for inputting high-temperature gas, which can exchange heat with the rotary cylinder to heat the material in the interior of the rotary cylinder.

[0021] In some embodiments, the outer peripheral surface of the heating furnace is provided with an air inlet and an air outlet, the air inlet is used for inputting high-temperature gas into the interior of the heating furnace, and the air outlet is used for discharging the heat-exchanged gas to the outside.

[0022] In some embodiments, the air inlet is connected with an air inlet channel, and the air inlet channel is arranged along the tangent direction of the outer peripheral surface of the heating furnace;

[0023] The air outlet is connected with an air outlet channel, and the air outlet channel is arranged along the tangent direction of the outer peripheral surface of the heating furnace.

[0024] In some embodiments, the air inlet channel is arranged at the side of the heating furnace in the horizontal direction, and the air outlet channel is arranged at the side of the heating furnace in the horizontal direction.

[0025] 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.

[0026] In some embodiments, the air inlet and the air outlet are arranged staggered in the horizontal direction.

[0027] 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.

[0028] In some embodiments, the gas inlets are multiple, and the multiple gas inlets are arranged at intervals.

[0029] The gas outlets are multiple, and the multiple gas outlets are arranged at intervals.

[0030] In some embodiments, the heating furnace comprises multiple sections connected in sequence, a separation structure is arranged between each two adjacent sections, each section is provided with at least one gas inlet and at least one gas outlet, and the temperature of the high-temperature gas input into different sections is different.

[0031] In a second aspect, the embodiments of the present application further provide a lithium battery recycling device, comprising:

[0032] A rotary cylinder, which comprises a feeding end with an opening;

[0033] A feeding device, a material outlet of the feeding device extending into the opening, for inputting the crushed recycled lithium battery into the rotary cylinder;

[0034] A gas delivery device arranged in the feeding device, for inputting a protective gas into the rotary cylinder;

[0035] A sealing device connected with the feeding device and the feeding end, for sealing the gap between the rotary cylinder and the feeding device.

[0036] The rotary kiln of the embodiments of the present application has the gas delivery device arranged in the feeding device and used for inputting a protective gas into the rotary cylinder, and the sealing device connected with the feeding device and the feeding end of the rotary cylinder and used for sealing the gap between the rotary cylinder and the feeding device, so that the feeding device, the gas delivery device and the sealing device can be combined together, and compared with the independent arrangement of each device, the overall structure of the rotary kiln can be more compact, the volume of the rotary kiln can be reduced, and the installation space can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment 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 creative labor.

[0038] Figure 1 FIG. 1 is a structural schematic diagram of the rotary kiln of the embodiments of the present application.

[0039] Figure 2 FIG. 2 is a front view of the rotary kiln shown in FIG. 1. Figure 1 ​

[0040] Figure 3 Fig. 1 is a schematic view of a rotary kiln according to an embodiment of the present application. Figure 2

[0041] Figure 4 Fig. 2 is a schematic view of a rotary kiln according to an embodiment of the present application. Figure 1

[0042] Figure 5 Fig. 3 is a schematic view of a first layout of an air inlet of a heating furnace of a rotary kiln according to an embodiment of the present application.

[0043] Figure 6 Fig. 4 is a schematic view of a second layout of an air inlet of a heating furnace of a rotary kiln according to an embodiment of the present application.

[0044] Figure 7 Fig. 5 is a schematic view of a layout of an air inlet and an air outlet of a heating furnace of a rotary kiln according to an embodiment of the present application.

[0045] Figure 8 Fig. 6 is a schematic view of an internal structure of a heating furnace of a rotary kiln according to an embodiment of the present application.

[0046] Figure 9 Fig. 7 is a schematic view of a structure of a rotary kiln system according to an embodiment of the present application.

[0047] BRIEF DESCRIPTION OF DRAWINGS

[0048] 100 - rotary kiln; 200 - rotary kiln system; 300 - main pipe;

[0049] 10 - feeding device; 20 - gas conveying device; 30 - sealing device; 40 - rotary cylinder; 50 - heating furnace; 60 - skid;

[0050] 11 - first shell; 21 - second shell; 22 - first flange; 31 - sealing part; 311 - first side of the sealing part; 312 - second side of the sealing part; 32 - third shell; 33 - second flange; 41 - feeding end; 42 - discharging end; 51 - air inlet; 51a - air inlet passage; 52 - air outlet; 52a - air outlet passage; 53 - flow guide plate; 54 - section of the heating furnace; 55 - partition structure; L - central axis of the heating furnace. DETAILED DESCRIPTION

[0051] 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 those skilled in the art without creative work fall within the scope of protection of the present application.

[0052] ​​The embodiment of the present application provides 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 is applied to lithium battery recycling and pyrolysis of crushed lithium batteries. It should be noted that, in addition to being applied to lithium battery recycling, the rotary kiln of the embodiment of the present application can also be applied to other fields and used for pyrolysis of other materials, which is not limited herein.

[0053] Reference Figures 1 to 3 , Figure 1 The structure schematic diagram of the rotary kiln 100 provided by the embodiment of the present application is shown in FIG. 1. Figure 2 The front view of the rotary kiln 100 shown in FIG. 1 is shown in FIG. 2. Figure 1 The front view of the rotary kiln 100 shown in FIG. 1 is shown in FIG. 2. Figure 3 The front view of the rotary kiln 100 shown in FIG. 1 is shown in FIG. 2. Figure 2 The front view of the rotary kiln 100 shown in FIG. 1 is shown in FIG. 2.

[0054] The rotary kiln 100 comprises a feeding device 10, a gas conveying device 20, a sealing device 30, a rotary cylinder 40, a heating furnace (or a heating furnace chamber) 50 and a skid 60.

[0055] 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 and pyrolyzing the lithium batteries. The rotary cylinder 40 comprises a feeding end 41 and a discharging end 42, and the feeding end 41 and the discharging end 42 both have openings. The feeding end 41 is used for inputting materials into the rotary cylinder 40, and the discharging end 42 is used for discharging products after pyrolysis of the materials to the outside.

[0056] The feeding device 10 is installed on the skid 60, and the skid 60 can be used for supporting the feeding device 10. The feeding device 10 has a material inlet and a material outlet. The material inlet is used for adding materials, such as crushed recycled lithium batteries, into the feeding device 10. In actual application, the material inlet can be funnel-shaped. The feeding device 10 is connected with 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, and is used for inputting materials, such as crushed recycled lithium batteries, into the rotary cylinder 40.

[0057] The gas conveying device 20 is arranged on the feeding device 10. The gas conveying device 20 is used for inputting protective gas into the rotary cylinder 40, so as to ensure an anaerobic environment in the rotary cylinder 40. In actual application, the protective gas can be nitrogen or other inert gas.

[0058] In some embodiments, the partial internal structure schematic diagram of the rotary kiln 100 shown in FIG. 1 is shown in FIG. 3. Figure 4 , Figure 4 The partial internal structure schematic diagram of the rotary kiln 100 shown in FIG. 1 is shown in FIG. 3. Figure 1 The partial internal structure schematic diagram of the rotary kiln 100 shown in FIG. 1 is shown in FIG. 3.

[0059] The feeding device 10 comprises a first shell 11. In practical applications, the first shell 11 can be annular, so that the material conveying part of the feeding device 10 is in the shape of a column as a whole. The gas conveying device 20 comprises a second shell 21. The second shell 21 is provided with a gas inlet for inputting the protective gas, for example, nitrogen.

[0060] The second shell 21 is sleeved on the outer periphery of the first shell 11. A 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 conveyed to the interior of the rotary cylinder 40 through the first gas passage.

[0061] In some embodiments, the second shell 21 and the first shell 11 are formed in an integrated structure. Therefore, the combination of the feeding function and the gas conveying function can be realized by one structure, so that the structure of the feeding device 10 and the gas conveying 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 in an integrated structure, which is also convenient for realizing good sealing between the second shell 21 and the first shell 11.

[0062] Continuing to refer to Figures 1 to 3 The sealing device 30 is connected with the feeding device 10 and the feeding end 41 of the rotary cylinder 40, and is used for sealing the gap between the rotary cylinder 40 and the feeding device 10. It can be understood that the material in the interior of the rotary cylinder 40 is easy to produce toxic gas in the process of pyrolysis, so it is necessary to ensure the sealing of the rotary cylinder 40 to avoid leakage of toxic gas. The sealing device 30 can seal the gap between the rotary cylinder 40 and the feeding device 10, which can realize good sealing of the rotary cylinder 40 without affecting the material conveying function of the feeding device 10.

[0063] 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 is connected with the third shell 32, and the second side 312 is connected with the feeding end 41 of the rotary cylinder 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.

[0064] The second gas passage is formed between the third shell 32 and the first shell 11, and 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 delivered 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 ease of description, and in actual application, the first gas passage and the second gas passage are not clearly separated.

[0065] In some embodiments, as shown in Figure 4 The gas delivery device 20 further includes a first flange 22. The second shell 21 is connected to the first flange 22. The sealing device 30 further includes a second flange 33. The third shell 32 is connected to the second flange 33. The first flange 22 is connected to the second flange 33 to achieve the connection of the third shell 32 and the second shell 21, and to achieve good sealing between the third shell 32 and the second shell 21.

[0066] The rotary kiln 100 of the embodiments of the present application, the gas delivery device 20 is arranged in the feeding device 10 and is used to input protective gas into the interior of the rotary drum 40, the sealing device 30 is connected with the feeding device 10 and the feeding end 41 of the rotary drum 40 and is used to seal the gap between the rotary drum 40 and the feeding device 10, so that the feeding device 10, the gas delivery device 20 and the sealing device 30 can be combined together, 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.

[0067] In some embodiments, continuing to refer to Figures 1 to 3 The heating furnace 50 is arranged outside the rotary drum 40. The interior of the heating furnace 50 is used to input high-temperature gas (hot air), and the high-temperature gas can exchange heat with the rotary drum 40 to heat the material in the interior of the rotary drum 40, so that the material can be indirectly heated by the high-temperature gas to achieve pyrolysis of the material. In actual application, the temperature of the high-temperature gas can be set according to actual needs. For example, in one feasible example, the temperature of the high-temperature gas can be 300-600°C.

[0068] In actual application, the high-temperature gas can be generated externally, for example, high-temperature flue gas generated by fuel combustion is delivered to the interior of the heating furnace 50 through a pipeline. It can be understood that the high-temperature flue gas generated by fuel combustion is only one feasible implementation manner of generating high-temperature gas, and other ways can also be used to generate high-temperature gas, and the original source of the high-temperature gas is not specifically limited in the embodiments of the present application.

[0069] In some embodiments, the outer peripheral surface of the heating furnace 50 is provided with an air inlet 51 and an air outlet 52. The air inlet 51 is used to input high-temperature gas into the heating furnace 50, for example, the air inlet 51 can be connected to an external high-temperature gas source through a pipe. The air outlet 52 is used to discharge the heat-exchanged gas to the outside.

[0070] It is understandable that the gas discharged from the outlet 52 can be directly discharged into the external environment, or it can be returned to the external high-temperature gas source for recycling, or it can be transported to other production processes for further use. This application does not specify the final destination of the gas discharged from the outlet 52.

[0071] In some embodiments, the air inlet 51 is connected to an air inlet channel, which is connected to an external air source. The extending 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. That is, the extending direction of the air inlet channel is not directly opposite the center of the rotating cylinder 40. In some embodiments, the air inlet channel is arranged along the tangential direction of the outer peripheral surface of the heating furnace 50.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In some embodiments, reference Figure 5 , Figure 5This 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.

[0076] 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.

[0077] In some embodiments, reference Figure 7 , Figure 7 This 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.

[0078] 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.

[0079] 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.

[0080] In some embodiments, referring to Figure 8 , Figure 8 is a schematic view of the internal structure of the heating furnace 50 of the rotary kiln of the embodiments. The inner wall of the heating furnace 50 is provided with a flow guide plate 53. The flow guide plate 53 is perpendicular to the central axis L of the heating furnace 50, and the flow guide plate 53 is close to the air inlet 51. The size of the flow guide plate 53 can be set according to actual needs. It can be understood that by setting the flow guide plate 53, the high-temperature gas input through the air inlet 51 can be prevented from directly discharging from the air outlet 52 without heat exchange with the rotary cylinder 40, and the high-temperature gas can form a spiral advancing flow mode with the help of the flow guide plate 53, so that the high-temperature gas is in full contact with the rotary cylinder 40, and the heat utilization rate of the high-temperature gas heating is improved.

[0081] In some embodiments, the air inlet 51 of the heating furnace 50 is multiple, and the multiple air inlets 51 are arranged at intervals; and / or, the air outlet 52 is multiple, and the multiple air outlets 52 are arranged at intervals. It can be understood that by setting multiple air inlets 51 and / or multiple air outlets 52, compared with a single air inlet and a single air outlet, the input speed and / or discharge speed of the high-temperature gas can be accelerated, so that the flow efficiency of the high-temperature gas inside the heating furnace 50 is improved, the heat exchange efficiency of the high-temperature gas and the rotary cylinder 40 is improved, and good heating effect is ensured.

[0082] In some embodiments, as shown in Figure 8 , the heating furnace 50 includes multiple sections 54 connected in sequence. A separation structure 55 is arranged between each two adjacent sections 54. The separation structure 55 can be, for example, a partition plate. Each section 54 is provided with at least one air inlet 51 and at least one air outlet 52. The temperature of the high-temperature gas input in different sections 54 is different. Therefore, multiple sections 54 can be set according to different heating needs, each section 54 forms a different temperature zone, and the temperature zones are separated from each other by the separation structure 55, so that the heating furnace 50 can be divided into multiple temperature zones independent of each other and not affecting each other, meeting the different heating needs of each process section, and avoiding the influence of the high-temperature gas in each temperature zone on each other.

[0083] The embodiments 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 battery.

[0084] Referring to Figure 9 , Figure 9 is a schematic view of the structure of the rotary kiln system 200 of the embodiments. The rotary kiln system 200 includes multiple stages of rotary kilns connected in sequence, and each stage of rotary kiln can be the rotary kiln 100 in the above embodiments, for example Figure 9As shown, the rotary kiln system 100 includes two rotary kilns 100. Each rotary kiln has different heating temperature requirements, which can meet the heating requirements of different process stages.

[0085] The outlet 52 of the heating furnace 50 of one rotary kiln 100 is connected to the inlet 51 of the heating furnace 50 of another rotary kiln 100, so that the gas discharged from the outlet 52 flows into the inlet 51. It can be understood that the gas discharged from the outlet 52 of the heating furnace 50 still has a certain temperature, so that the gas discharged from the outlet 52 of one heating furnace flows into the inlet 51 of another heating furnace, which can heat the materials in another rotary kiln again, fully utilize the heat energy of the gas, and improve the overall heat energy utilization rate of the rotary kiln.

[0086] For example, in actual application, high-temperature gas can be first input into a rotary kiln 100 with higher heating temperature requirements to heat the materials, and then flow into a rotary kiln 100 with lower heating temperature requirements to heat the materials, so as to fully utilize the high-temperature gas and improve the overall heat energy utilization rate.

[0087] In some embodiments, as shown in FIG. 2, Figure 9 As shown, the rotary kiln system 200 further includes a main pipeline 300. The outlet 52 of the heating furnace 50 of one rotary kiln 100 is connected to the inlet 51 of the heating furnace 50 of another rotary kiln 100 through the main pipeline 300, so that the gas discharged from the outlet 52 can flow into the inlet 51 of another heating furnace 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 heating temperature requirement of the subsequent rotary kiln 100 is higher, 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 heating temperature requirement of the subsequent rotary kiln 100 is lower, normal-temperature gas can be input into the main pipeline 300 through the bypass pipeline to reduce the temperature of the gas in the main pipeline 300.

[0088] In some embodiments, an adjusting valve is arranged on the bypass pipeline to adjust the flow of gas in the bypass pipeline. It can be understood that by adjusting the flow of 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.

[0089] 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. In this case, the gas outlet of the heating furnace of the first-stage rotary kiln 100 is connected to 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 to 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 to 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 to the gas outlet of the heating furnace located upstream of the material conveying direction.

[0090] It can be understood that, in actual applications, the heating temperatures required by the rotary kilns 100 of different stages of the rotary kiln system 200 are different. It is possible that the heating temperature required by the rotary kiln 100 located upstream of the material conveying direction is higher than the heating temperature required by the rotary kiln 100 located downstream of the material conveying direction, 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; or it is possible that the heating temperature required by the rotary kiln 100 located downstream of the material conveying direction is higher than the heating temperature required by the rotary kiln 100 located upstream of the material conveying direction, 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 embodiments 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 rotary kiln located upstream and the rotary kiln located downstream, different heating process requirements can be met, and the setting of the rotary kiln system 200 is more flexible.

[0091] In the description of the present application, it should be understood that terms such as "first", "second", etc. 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.

[0092] The principles and implementation modes of the present application are described by applying specific examples herein, and the above descriptions of the examples are only used to help understand the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges can be changed, 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 comprising a feeding end with an opening; a feeding device, a material outlet of which extends into the opening, for feeding material into the interior of the rotary cylinder; a gas delivery device provided on the feeding device for feeding protective gas into the interior of the rotary cylinder; a sealing device connected with the feeding device and the feeding end for sealing the gap between the rotary cylinder and the feeding device.

2. The rotary kiln according to claim 1, wherein: the feeding device comprises a first shell, and the gas delivery device comprises a second shell provided with a gas inlet for feeding the protective gas; the second shell is sleeved on the peripheral edge of the first shell, and a first gas passage is formed between the second shell and the first shell, which is in communication with the interior of the rotary cylinder.

3. The rotary kiln according to claim 2, wherein: the second shell is formed in an integral structure with the first shell.

4. The rotary kiln according to claim 2, wherein: the sealing device comprises a sealing part and a third shell, the sealing part is annular, and comprises opposite first and second sides, the first side is connected with the third shell, and the second side is connected with the feeding end; the third shell is connected with the second shell, and a second gas passage is formed between the third shell and the first shell, which is in communication with the first gas passage and the interior of the rotary cylinder.

5. The rotary kiln according to claim 4, wherein: the gas delivery device further comprises a first flange, and the second shell is connected with the first flange; the sealing device further comprises a second flange, and the third shell is connected with the second flange; the first flange is connected with the second flange.

6. A rotary kiln according to any one of claims 1 to 5, characterised in that, The rotary kiln further comprises: a heating furnace sleeved on the exterior of the rotary cylinder, and the interior of the heating furnace is used for feeding high-temperature gas which can exchange heat with the rotary cylinder to heat the material in the interior of the rotary cylinder.

7. The rotary kiln according to claim 6, wherein: the peripheral surface of the heating furnace is provided with an air inlet and an air outlet, the air inlet is used for feeding high-temperature gas into the interior of the heating furnace, and the air outlet is used for discharging the heat-exchanged gas to the outside.

8. The rotary kiln according to claim 7, wherein: the air inlet is connected with an air inlet channel arranged along the tangent direction of the peripheral surface of the heating furnace; the air outlet is connected with an air outlet channel arranged along the tangent direction of the peripheral surface of the heating furnace.

9. The rotary kiln according to claim 8, wherein: the air inlet channel is arranged along the horizontal direction at the side of the heating furnace, and the air outlet channel is arranged along the horizontal direction at the side of the heating furnace.

10. The rotary kiln according to claim 7, wherein: 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.

11. The rotary kiln according to claim 7, wherein: The air inlet and the air outlet are arranged in a horizontal direction.

12. The rotary kiln according to claim 7, characterized in that: The inner wall of the heating furnace is provided with a guide plate, the guide plate is perpendicular to the central axis of the heating furnace, and the guide plate is close to the air inlet.

13. The rotary kiln according to claim 7, characterized in that: The air inlet is a plurality of air inlets, and the plurality of air inlets are arranged at intervals; and / or The air outlet is a plurality of air outlets, and the plurality of air outlets are arranged at intervals.

14. The rotary kiln according to claim 13, characterized in that: The heating furnace comprises a plurality of sequentially connected sections, 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.

15. A lithium battery recycling processing apparatus, characterized by, Comprise: A rotary cylinder body, the rotary cylinder body comprises a feeding end, the feeding end has an opening; A feeding device, the material outlet of the feeding device extends into the opening, for inputting crushed recycled lithium batteries into the rotary cylinder body; A gas conveying device is arranged on the feeding device, for inputting protective gas into the rotary cylinder body; A sealing device is connected with the feeding device and the feeding end, for sealing the gap between the rotary cylinder body and the feeding device.

Images