Pyrolysis furnace

Abstract

The utility model provides a pyrolyzing furnace, and relates to the technical field of batteries. The pyrolyzing furnace comprises a furnace body and a material stirring piece, and the furnace body is provided with a cooling layer; the material stirring piece is rotationally installed in the furnace body, the material stirring piece can rotate, the material stirring piece is provided with a first stirring part located in the cooling layer, and rotation of the material stirring piece is configured to enable the first stirring part to stir materials in the cooling layer; wherein the shifting part is provided with a first cooling channel which is at least partially distributed on the first shifting part; the cavity wall of the cooling layer is provided with a second cooling channel. The cooling efficiency of the pyrolyzing furnace can be improved, the number of cooling layers is reduced, and the cooling time is shortened.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pyrolysis furnace. Background Art

[0002] When separating the positive lithium iron phosphate particles and negative graphite in the waste lithium iron phosphate battery powder, most of them use a disk dryer to modify the surface of the positive lithium iron phosphate particles for flotation separation. The disk dryer is sequentially provided with a preheating layer, a pyrolysis layer and a cooling layer from top to bottom. However, the cooling efficiency of each cooling layer is low. In order to ensure the cooling effect, a large number of cooling layers need to be set, which also leads to a longer cooling time. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a pyrolysis furnace, aiming to solve the technical problems of low cooling efficiency and long cooling time of the disk dryer in the prior art.

[0004] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0005] The present application embodiment provides a pyrolysis furnace, the pyrolysis furnace comprising:

[0006] A furnace body, wherein the furnace body has a cooling layer;

[0007] A material shifting member, the material shifting member is rotatably mounted in the furnace body, the material shifting member is rotatable, and the material shifting member has a first shifting portion located in the cooling layer;

[0008] The material-shifting member has a first cooling channel which is at least partially distributed on the first shifting portion, and the cavity wall of the cooling layer has a second cooling channel.

[0009] In one embodiment, the furnace body further comprises a preheating layer and a pyrolysis layer, wherein the preheating layer, the pyrolysis layer and the cooling layer are arranged in sequence from top to bottom and can form a circuitous material channel extending from top to bottom;

[0010] Among them, the cooling layer located at the lower end is provided with an air inlet, and the preheating layer located at the upper end is provided with an air outlet.

[0011] In one of the embodiments, the cavity wall of the pyrolysis layer is provided with a first heating channel;

[0012] And / or, the material-moving member has a second moving portion located in the pyrolysis layer, and the material-moving member also has a second heating channel at least partially distributed in the second moving portion.

[0013] In one embodiment, the pyrolysis furnace further includes a partition, the furnace body has an inner cavity, and the partition is arranged in the inner cavity to divide the inner cavity from top to bottom into the preheating layer, the pyrolysis layer and the cooling layer;

[0014] Among them, the material moving part includes a main shaft and multiple scrapers, and the multiple scrapers are arranged on the main shaft. The scrapers located in the preheating layer form the third moving part, the scrapers located in the pyrolysis layer form the second moving part, and the scrapers located in the cooling layer form the first moving part.

[0015] In one embodiment, the partition comprises n furnace plates, and the n furnace plates are sequentially arranged from the upper end of the furnace body to the lower end of the furnace body, and n is a natural number, and n≥2;

[0016] Among them, each of the furnace plates has a blanking opening, the furnace plate located at the nth layer is a central blanking plate, and the furnace plate located at the n+1th layer is an edge blanking plate. The blanking opening of the central blanking plate is located in the middle thereof and forms a central blanking opening, and the blanking opening of the edge blanking plate is located at its edge and forms an edge blanking opening.

[0017] In one of the embodiments, the movement of the scraper is configured to be able to apply a driving force to the material to move toward the drop opening on the furnace plate corresponding to it.

[0018] In one embodiment, the edge blanking tray is mounted on the main shaft, and the edge blanking tray is provided with a plurality of blanking openings in a circumferential direction;

[0019] Wherein, the second heating channel is also distributed at the edge drop tray located at the pyrolysis layer.

[0020] In one embodiment, the edge blanking tray has a mounting hole in the middle, and the spindle is inserted into the mounting hole and the central blanking opening;

[0021] Wherein, a shielding portion is provided on the main shaft at the mounting hole, and the mounting hole is located within a coverage area of ​​the axial projection of the shielding portion on the main shaft.

[0022] In one of the embodiments, the upward end of the furnace plate is arranged as an inclined surface, and the inclined surface is configured to enable the material located thereon to have a tendency to move toward the corresponding drop opening.

[0023] In one embodiment, the portion of the second cooling channel located on the cavity wall of the cooling layer is at least partially located inside the corresponding furnace plate;

[0024] The portion of the first heating channel located at the cavity wall of the pyrolysis layer is at least partially located inside the corresponding furnace plate.

[0025] The beneficial effects of this application are:

[0026] The present application provides a pyrolysis furnace, which can achieve heat dissipation while stirring materials through a first cooling channel in a first toggle part in conjunction with a second cooling channel on the cavity wall of a cooling layer, and increase the heat exchange area, thereby effectively improving the heat dissipation efficiency, reducing the number of cooling layers, shortening the cooling time, and reducing the height of the furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The structure of the pyrolysis furnace in the first embodiment of the present application is shown in FIG. Figure 1 ;

[0029] Figure 2 The structure of the pyrolysis furnace in the first embodiment of the present application is shown in FIG. Figure 2 ;

[0030] Figure 3 Shows Figure 2 A local enlarged view of point A in FIG.

[0031] Figure 4 The schematic diagram of the structure of the edge drop tray of the pyrolysis furnace in the first embodiment of the present application is shown;

[0032] Figure 5 The schematic diagram of the structure of the central material drop tray of the pyrolysis furnace in the first embodiment of the present application is shown;

[0033] Figure 6 The schematic diagram of the structure of the pyrolysis furnace in the second embodiment of the present application is shown.

[0034] Description of main component symbols:

[0035] 100-furnace body; 110-preheating layer; 120-pyrolysis layer; 130-cooling layer; 200-air outlet; 300-feed port; 400-air inlet; 500-feeding piece; 510-spindle; 520-scraper; 530-second heating channel; 540-first cooling channel; 600-center drop tray; 610-center drop port; 700-edge drop tray; 710-edge drop port; 720-mounting hole; 800-shielding part. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] In the related technology, waste lithium iron phosphate battery powder contains a large number of positive lithium iron phosphate particles, fluorine-containing organic particles and negative graphite particles. The surface polarity of lithium iron phosphate particles is strong and they show strong hydrophilicity, while graphite particles are strong hydrophobicity. It is a practical method to utilize the difference in hydrophilicity and hydrophobicity between the two to achieve efficient separation through flotation.

[0041] Since the organic binder PVDF (polyvinylidene difluoride) attached to the surface of lithium iron phosphate particles during coating makes them have strong hydrophobicity, the separation efficiency of positive and negative electrode materials in flotation is low, and a large amount of positive electrode materials enter the negative electrode graphite powder during the separation process, which is not conducive to the wet recovery of lithium iron phosphate and the regeneration and recycling of graphite negative electrode. Therefore, before the positive electrode lithium iron phosphate particles and negative electrode graphite in the waste lithium iron phosphate battery powder are flotation-separated, it is necessary to use a disk dryer to modify the surface of the positive electrode lithium iron phosphate particles for flotation separation, and the disk dryer is sequentially provided with a preheating layer, a pyrolysis layer and a cooling layer from top to bottom. However, in order to ensure the cooling effect, it is necessary to set a multi-layer cooling layer, which also leads to a long cooling time, and the height of the disk dryer increases, which is not convenient for the installation of supporting equipment (such as feeding equipment, waste gas treatment equipment, etc.), and has a high requirement for the height of the factory building.

[0042] like Figure 1 and Figure 2 As shown, the first embodiment of the present application provides a pyrolysis furnace, which includes a furnace body 100 and a material shifting member 500, wherein the furnace body 100 has a cooling layer 130; the material shifting member 500 is rotatably installed in the furnace body 100, the material shifting member 500 can rotate, and the material shifting member 500 has a first shifting portion located in the cooling layer 130, and the rotation of the material shifting member 500 is configured to enable the first shifting portion to shift the material in the cooling layer 130;

[0043] The material shifting member 500 has a first cooling channel 540 at least partially distributed in the first shifting portion, and a first cooling medium flows through the first cooling channel 540 ; the cavity wall of the cooling layer 130 has a second cooling channel, and a second cooling medium flows through the second cooling channel.

[0044] In this embodiment, the furnace body 100 takes a vertical furnace body 100 as an example, the upper end of the furnace body 100 is provided with a feed port 300, and the lower end of the furnace body 100 is provided with a discharge port. During operation, the material is discharged from the feed port 300 of the furnace body 100, and the material is discharged from the discharge port after passing through the preheating layer 110, the pyrolysis layer 120 and the cooling layer 130 in sequence. Among them, by respectively providing the second cooling channel and the first cooling channel 540 in the cavity wall of the cooling layer 130 and the first toggle portion located in the cooling layer 130, the second cooling medium and the first cooling medium are used to simultaneously perform heat exchange with the material in the cooling layer 130.

[0045] Obviously, the first moving part can rotate with the main shaft 510 to contact and move the material, so as to achieve the effect of stirring the material, that is, the material can be evenly contacted with the first moving part and the cavity wall of the cooling layer 130, thereby improving the heat dissipation efficiency and heat dissipation uniformity. In addition, since the material is stirred by the first moving part, the material can be in contact with the gas in the furnace body 100, thereby enhancing the heat dissipation effect.

[0046] Exemplarily, the first cooling channel 540 is distributed in the material-dispensing member 500 and the first dispensing portion, and the first cooling channel 540 extends along the axial direction of the material-dispensing member 500 so as to be connected to a pipeline for conveying the first cooling medium through a rotary joint. It should be noted that the first cooling medium in the first cooling channel 540 and the second cooling medium in the second cooling channel both maintain flow. Optionally, the first cooling channel 540 can form a circulation channel with the pipeline for conveying the first cooling medium; similarly, the second cooling channel can form a circulation channel with the pipeline for conveying the second cooling medium.

[0047] Of course, based on reducing costs and reducing operational difficulty, the first cooling medium and the second cooling medium are the same, such as cooling water, cooling oil, etc., and no specific limitation is made here.

[0048] By using the pyrolysis furnace provided by the utility model, the first cooling channel 540 in the first toggle part cooperates with the second cooling channel on the cavity wall of the cooling layer 130 to achieve heat dissipation while stirring the material, and increase the heat exchange area, thereby effectively improving the heat dissipation efficiency, reducing the number of cooling layers 130, shortening the cooling time, and lowering the height of the furnace body 100 to solve other technical problems caused by the height of the furnace body 100.

[0049] like Figure 2 As shown, in some embodiments, as described above, the furnace body 100 also has a preheating layer 110 and a pyrolysis layer 120; specifically, the preheating layer 110, the pyrolysis layer 120 and the cooling layer 130 are arranged in sequence from top to bottom and can form a circuitous material channel extending from top to bottom; wherein, the cooling layer 130 located at the lower end is provided with an air inlet 400, and the preheating layer 110 located at the upper end is provided with an air outlet 200.

[0050] In this embodiment, the treatment of lithium iron phosphate battery powder of waste batteries is taken as an example, that is, the material treated by the pyrolysis furnace provided in this application is lithium iron phosphate battery powder of waste batteries. During the treatment process of the pyrolysis furnace, the preheating working temperature of the preheating layer 110 is lower than the pyrolysis working temperature of the pyrolysis layer 120, and the cooling working temperature of the cooling layer 130 is lower than the preheating working temperature of the preheating layer 110.

[0051] At the same time, a gaseous cooling medium is introduced through the air inlet 400 of the cooling layer 130 located at the lower end, and the gaseous cooling medium passes through the cooling layer 130, the pyrolysis layer 120 and the preheating layer 110 from bottom to top in sequence, and is discharged from the air outlet 200 of the preheating layer 110 located at the upper end. The gaseous cooling medium is configured to be used only for heat exchange.

[0052] It is easy to understand that the mixed material of the positive electrode material and the negative electrode material in the waste lithium battery is first passed into the preheating layer 110 from the feed inlet 300 and kept moving in the preheating layer 110 to preheat the material and prepare for the next roasting step; after the preheating is completed, the temperature of the material entering the pyrolysis layer 120 is adjusted, and the temperature of the material is further increased, which can remove the organic matter adhering to the surface of the positive electrode material and completely decompose the organic matter; after the material is pyrolyzed in the pyrolysis layer 120, it enters the cooling layer 130, and the first cooling channel 540 and the second cooling channel are used to cool the material.

[0053] In addition, during operation, a gaseous cooling medium is introduced from the air inlet 400, and the gaseous cooling medium passes through the cooling layer 130, the pyrolysis layer 120 and the preheating layer 110 from bottom to top. In this process, the gaseous cooling medium first contacts the material in the cooling layer 130 to cool it down, and at the same time, the temperature of the gaseous cooling medium increases; secondly, the heated gaseous cooling medium can be quickly heated after entering the pyrolysis layer 120 to act on the material; finally, the gaseous cooling medium can use the residual heat to preheat the material in the preheating layer 110 after entering the preheating layer 110, thereby making full use of the preheating. Of course, an air inlet can also be provided on the side wall of the preheating layer 110 to introduce heating gas into the preheating layer 110 through the air inlet to achieve the purpose of adjusting the temperature in the preheating layer 110. For example, the heating gas can be heated nitrogen, and of course, it can also be other gases that do not react with the material.

[0054] Exemplarily, the gaseous cooling medium is an inert gas, ensuring that the gaseous cooling medium is only used for heat exchange and does not react with the material. In other words, as long as the gaseous cooling medium can absorb the heat of the material in the cooling layer 130 to achieve the purpose of cooling, the temperature of the gaseous cooling medium can be room temperature, or low temperature, etc., as long as the temperature of the gaseous cooling medium is lower than the temperature of the material. Specifically, in this application, nitrogen is used as an example of the gaseous cooling medium. Of course, other inert gases can also be used, which is not limited here. It should be noted that nitrogen, as a carrier of organic decomposition products, can take away the fluorine-containing gas.

[0055] like Figure 2 and Figure 3 As shown, in one embodiment, the cavity wall of the pyrolysis layer 120 is provided with a first heating channel, and a first heating medium flows through the first heating channel;

[0056] And / or, the material moving member 500 has a second moving portion located in the pyrolysis layer 120, the second moving portion moves the material in the pyrolysis layer 120, and the material moving member 500 also has a second heating channel 530 at least partially distributed in the second moving portion, and a second heating medium flows through the second heating channel 530.

[0057] That is, the following situations exist:

[0058] In the first case, only the first heating channel is provided on the cavity wall of the pyrolysis layer 120, and the first heating medium exchanges heat with the material to heat the material;

[0059] In the second case, only the second toggle portion is provided with a second heating channel 530, and the second heating medium exchanges heat with the material to heat the material;

[0060] In the third case, a first heating channel is provided on the cavity wall of the pyrolysis layer 120, and at the same time, a second heating channel 530 is provided on the second driving part, so that the material is heated by the first heating medium and the second heating medium.

[0061] Optionally, the first heating medium and the second heating medium are the same, which can simplify the equipment structure and reduce costs. Exemplarily, the first heating medium and the second heating medium are both thermal oils, and the precise temperature control of the thermal oils effectively saves energy and fuel costs, while avoiding the loss of negative electrode graphite materials and physical phase destruction. Of course, in some embodiments, the first heating medium and the second heating medium can also be set to different types, which are not specifically limited here, and the specific types can be set according to the actual scenario.

[0062] like Figure 2 As shown, in one embodiment, the pyrolysis furnace further includes a partition, the furnace body 100 has an inner cavity, and the partition is arranged in the inner cavity to divide the inner cavity into a preheating layer 110, a pyrolysis layer 120 and a cooling layer 130 from top to bottom;

[0063] Among them, the material moving part 500 includes a main shaft 510 and multiple scrapers 520, and the multiple scrapers 520 are arranged on the main shaft 510. The scrapers 520 located in the preheating layer 110 form a third moving part, and the third moving part moves the material in the preheating layer 110. The scrapers 520 located in the pyrolysis layer 120 form a second moving part, and the scrapers 520 located in the cooling layer 130 form a first moving part.

[0064] Specifically, the number of preheating layers 110 can be multiple, the number of pyrolysis layers 120 can be multiple, and the number of cooling layers 130 can be multiple; in other words, the partition divides the inner cavity into multiple layers of chambers, and divides the multi-layer chambers from top to bottom into multiple preheating layers 110, multiple pyrolysis layers 120 and multiple cooling layers 130. The specific number can be set according to actual needs and is not specifically limited here.

[0065] Exemplarily, the preheating layer 110 includes 2-4 chambers, the pyrolysis layer 120 includes 4-6 chambers, and the cooling layer 130 includes 2-4 chambers.

[0066] In addition, the main shaft 510 is extended from bottom to top, and the scrapers 520 are distributed so that each chamber can have a scraper 520, and the material can be stirred by the scraper 520 to improve the corresponding heating effect and cooling efficiency.

[0067] Exemplarily, the furnace body 100 is configured to be cylindrical, the main shaft 510 and the furnace body 100 are coaxially configured, and a driving motor is disposed at the bottom of the furnace body 100 , and the driving motor is connected to the main shaft 510 to drive the main shaft 510 to rotate.

[0068] To facilitate understanding of the improved structure of the present application, it should be noted that, based on the working principle of the disk dryer, the disk dryer has a central axis and rakes installed on the central axis, and the rakes are driven to rotate by the central axis to scrape the material to the drop opening of the furnace plate. Obviously, the main axis 510 of the present application can be the central axis, but the scraper 520 is not necessarily a rake, that is, in some embodiments, the scraper 520 and the rake can be the same component, that is, the scraper 520 can play the role of a rake; and in some embodiments, the scraper 520 and the rake can also be different components, and the two have different divisions of labor.

[0069] That is to say, when the scraper 520 and the rake blade are the same component, the first toggle portion, the second toggle portion and the third toggle portion can be formed by the rake blade; when the scraper 520 and the rake blade are different components, the first toggle portion, the second toggle portion and the third toggle portion are not formed by the rake blade, but are formed by the scraper 520.

[0070] On the basis of the above embodiment, the first cooling medium and the second cooling medium are both cooling water, and the main shaft 510 and the first toggle part are both provided with a first cooling channel 540, so that an inlet connected to the first cooling channel 540 is provided on the main shaft 510, and the inlet is provided at the end of the main shaft 510, and an outlet connected to the first cooling channel 540 is provided at the end of the first toggle part, so that the first cooling channel 540 is connected to the cooling water unit for rapid cooling, and enters the first cooling channel 540 for circulation after cooling.

[0071] Exemplarily, the first cooling channel 540 also has a portion extending along the axis of the main shaft 510, and the first cooling channel 540 is formed with a first inlet and a first outlet at the end of the main shaft 510; that is, the first cooling channel 540 is at least distributed on the main shaft 510 and the first shifting portion. As is common knowledge among technicians in this field, the first inlet and the first outlet are respectively connected to the inlet and outlet of the first rotating joint connected to the lower end of the main shaft 510, and the first inlet has an extended section extending along the main shaft 510, so that the first inlet, the first cooling channel 540 and the first outlet constitute a rotary cooling channel, which can realize the flow of cooling water along the rotary cooling channel.

[0072] The pyrolysis furnace provided by the present application is used to achieve dynamic uniform pyrolysis, wherein a combination of multiple chambers is used to synchronously control the main process parameters such as pyrolysis temperature, time, and atmosphere; the material can be tumbled and evenly heated in the furnace body 100, so that the pyrolysis time of the lithium iron phosphate battery is shortened and the pyrolysis uniformity is improved; the organic matter removal rate of the material in the present application can reach more than 99%. In addition, the temperature gradient in the furnace body 100 is obvious, and preheating, pyrolysis, and cooling are independently completed in one furnace body 100. The temperature field in each stage is uniform, and the temperature and atmosphere in different stages are highly controllable and easy to control.

[0073] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the partition includes n furnace plates, and the n furnace plates are sequentially arranged from the upper end of the furnace body 100 to the lower end of the furnace body 100, n is a natural number, and n≥2;

[0074] Among them, each furnace plate has a material drop opening, the furnace plate located at the nth layer is the central material drop opening 600, and the furnace plate located at the n+1th layer is the edge material drop opening 700. The material drop opening of the central material drop opening 600 is located in the middle and forms a central material drop opening 610, and the material drop opening of the edge material drop opening 700 is located at its edge and forms an edge material drop opening 710. All the material drop openings together constitute the above-mentioned circuitous material channel, and the material flows along the circuitous material channel.

[0075] In this embodiment, the material falls into the furnace body 100 from the feed port 300, and the material will fall onto the furnace plate; when the material falls onto the central drop tray 600, the material will move toward the central drop port 610 located at the central drop tray 600 to fall into the edge drop tray 700 below; when the material falls onto the edge drop tray 700, the material will move toward the edge drop port 710 located at the edge drop tray 700 to fall into the central drop tray 600 below, thereby making the material move along an S-shaped path, thereby extending its movement time in the furnace body 100.

[0076] Exemplarily, the central drop tray 600 and the edge drop tray 700 are both coaxially arranged with the main shaft 510 , and the central drop opening 610 of the central drop tray 600 is coaxially arranged with the main shaft 510 , and the main shaft 510 passes through the central drop opening 610 on the central drop tray 600 .

[0077] For example, in the above steps, when the material passes through the preheating layer 110 , the pyrolysis layer 120 and the cooling layer 130 , the moving speed of the material can be controlled by controlling the rotation speed of the main shaft 510 .

[0078] For example, there are 10 chambers in the furnace body 100, 1-4 layers are preheating layers 110, and the hot air from the pyrolysis layer 120 preheats the material, while reducing the temperature of the gas discharged from the outlet 200. 5-8 layers are pyrolysis layers 120, which use heat transfer oil for precise temperature control, ensuring that the temperature of the lithium iron phosphate particle material is continuously stable within the set temperature range, so that the organic matter PVDF on the surface of the lithium iron phosphate particles is completely decomposed and removed; 9-10 layers are cooling layers 130. After the modified material is subjected to the flotation process, the negative electrode graphite entrains less than 3% of the lithium iron phosphate particles, which has good economic applicability.

[0079] For example, when n is equal to 2, the first stove plate is the central stove plate, and the second stove plate is the edge stove plate; when n=3, the first stove plate is the central stove plate, the second stove plate is the edge stove plate, and the third stove plate is the central stove plate, etc. Of course, in other embodiments, n can also be 4, 5, 6, etc., which will not be listed here one by one.

[0080] like Figure 2 As shown, in one embodiment, the movement of the scraper 520 is configured to be able to apply a driving force to the material to move toward the drop opening on the furnace plate corresponding to it.

[0081] The rotation of the scraper 520 is used to push the material of the corresponding center drop tray 600 to the center drop port 610 or the material of the edge drop tray 700 to move to the edge drop port 710, which can not only maintain the fluidity of the material, but also avoid uneven distribution of the material on the center drop tray 600 or the edge drop tray 700 and the presence of material residue.

[0082] like Figure 2 As shown, in some embodiments, a mounting hole 720 is provided in the middle of the edge blanking tray 700, and the main shaft 510 is inserted into the mounting hole 720 and the center blanking port 610; wherein, a shielding portion 800 is provided on the main shaft 510 at the mounting hole 720, and the mounting hole 720 is located within the coverage area of ​​the shielding portion 800 on the axial projection of the main shaft 510.

[0083] That is to say, the edge drop tray 700 and the center drop tray 600 are both installed on the inner wall of the furnace body 100, and there is no interference between the rotation of the main shaft 510 and the edge drop tray 700 and the center drop tray 600. However, since the material falls from the central drop opening 610 of the center drop tray 600 to the middle of the edge drop tray 700, in order to prevent the material from directly falling from the mounting hole 720 into the next layer of the center drop tray 600, a shielding part 800 is provided at the part of the main shaft 510 located at each edge drop tray 700, and then the shielding part 800 blocks the gap between the mounting hole 720 and the main shaft 510, so that the material can be guided to the edge drop tray 700.

[0084] Exemplarily, the shielding portion 800 is a disk coaxially mounted on the main shaft 510 , and the outer diameter of the disk is greater than the diameter of the mounting hole 720 .

[0085] like Figure 6 As shown, the second embodiment of the present application provides a pyrolysis furnace, the only difference being that no corresponding toggle portion is provided at the edge blanking tray 700. Specifically, the edge blanking tray 700 is mounted on the main shaft 510, and the edge blanking tray 700 is provided with a plurality of edge blanking openings 710 in the circumferential direction; wherein the second heating channel 530 is also distributed in the edge blanking tray 700 located at the pyrolysis layer 120.

[0086] In this embodiment, since the edge material drop tray 700 is fixed to the main shaft 510, the edge material drop tray 700 rotates with the main shaft 510, so that the material can be moved to the edge material drop opening 710 on the edge material drop tray 700 under the action of centrifugal force, and the material can be evenly distributed under the action of centrifugal force. Obviously, in this embodiment, it is not necessary to set a toggle part on the edge material drop tray 700 to achieve driving material movement, which can save costs.

[0087] In addition, due to the structural characteristics between the edge blanking tray 700 and the main shaft 510 , the second heating channel 530 can be distributed on the edge blanking tray 700 to eliminate the first heating channel on the edge blanking tray 700 .

[0088] like Figure 6 As shown, in one embodiment, an upward end of the furnace plate is arranged as an inclined surface, and the inclined surface is configured to enable the material located thereon to have a tendency to move toward the corresponding drop opening.

[0089] For example, the furnace plate has an inner edge and an outer edge, and the height of the inner edge is higher than the height of the outer edge, so that the upper end surface of the furnace plate forms an inclined surface, thereby enabling the material to move toward the outer edge. Thus, the movement of the material is facilitated by providing the above-mentioned inclined surface.

[0090] Of course, in other embodiments, the slopes of the inclined surfaces of the edge drop tray 700 and the central drop tray 600 may be set to be the same or different, which is not specifically limited here.

[0091] In some embodiments, the second heating channel 530 also has a portion extending along the axis of the main shaft 510, and the second heating channel 530 is formed with a second inlet and a second outlet at the end of the main shaft 510; wherein the first cooling channel 540 and the second heating channel 530 are respectively located at both ends of the main shaft 510 to avoid interference between the two.

[0092] That is to say, the second heating channel 530 is distributed at least on the main shaft 510 and the second toggle portion. Among them, as common knowledge of technicians in this field, the second inlet and the second outlet are respectively connected to the inlet and outlet of the second rotary joint connected to the end of the main shaft 510, and the second inlet has an extended section extending along the main shaft 510 to form a rotary heating flow channel. It should be noted that the first rotary joint and the second rotary joint are respectively located at opposite ends of the main shaft 510, and how to install the rotary joint is common knowledge of technicians in this field and is not specifically limited here.

[0093] In some embodiments, the portion of the second cooling channel located on the cavity wall of the cooling layer 130 is at least partially located inside the corresponding furnace plate;

[0094] The portion of the first heating channel located on the cavity wall of the pyrolysis layer 120 is at least partially located inside the corresponding furnace plate.

[0095] That is to say, by setting the part of the first heating channel located on the furnace plate inside the furnace plate, the inner wall of the pyrolysis layer 120 is ensured to be smooth and material jamming is avoided; similarly, by setting the part of the second cooling channel located on the furnace plate inside the furnace plate, the inner wall of the cooling layer 130 is ensured to be smooth and material jamming is avoided.

[0096] Exemplarily, the first heating channel is a jacket structure provided on the cavity wall of the pyrolysis layer 120 , and in order to reduce the residue of materials on the inner wall of the pyrolysis layer 120 , the inner wall of the pyrolysis layer 120 is made into a smooth plane.

[0097] As above, the second cooling channel may also adopt a similar structural setting to the first heating channel, which will not be described in detail here. In addition, to facilitate understanding of the technical solution of the present application, the working principle is provided as follows:

[0098] The material is transported to the feed port 300 by a screw feeder, and the material passes through the edge feed port 710 of the edge feed tray 700 and the center feed port 610 of the center feed tray 600 from top to bottom to reach the discharge port. In this process, the material passes through the preheating layer 110, the pyrolysis layer 120 and the cooling layer 130 in sequence, so that the preheating layer 110 can preheat the material, the pyrolysis layer 120 can pyrolyze the organic matter on the surface of the positive electrode material in the material, and the cooling layer 130 can cool the pyrolyzed material; wherein, the gaseous cooling medium introduced from the air inlet 400 at the bottom of the furnace body 100 can realize the cooling of the material in the cooling layer 130, and facilitate the waste heat of the material in the cooling layer 130 to cooperate with the first heating channel and the second heating channel 530 in the pyrolysis layer 120 to quickly heat up to the pyrolysis temperature, and because the gaseous cooling medium can contact the material, it is beneficial to improve the heating uniformity and the pyrolysis effect, and the gaseous cooling medium discharged from the pyrolysis layer 120 can realize the preheating of the material in the preheating layer 110, realize the waste heat utilization, and save energy and reduce consumption. In addition, since the second heating channel 530 is provided at one end of the main shaft 510 and the second toggle part, the pyrolysis efficiency can be further improved; and since the first cooling channel 540 is provided at the other end of the main shaft 510 and the first toggle part, the cooling efficiency can be further improved.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0100] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A pyrolysis furnace, characterized in that: The pyrolysis furnace comprises: A furnace body (100), wherein the furnace body (100) has a cooling layer (130); A material shifting member (500), the material shifting member (500) being rotatably mounted in the furnace body (100), and the material shifting member (500) having a first shifting portion located in the cooling layer (130); The material-shifting member (500) has a first cooling channel (540) at least partially distributed on the first shifting portion, and the cavity wall of the cooling layer (130) has a second cooling channel.

2. The pyrolysis furnace according to claim 1, characterized in that: The furnace body (100) further comprises a preheating layer (110) and a pyrolysis layer (120), wherein the preheating layer (110), the pyrolysis layer (120) and the cooling layer (130) are arranged in sequence from top to bottom and can form a circuitous material channel extending from top to bottom; The cooling layer (130) located at the bottom is provided with an air inlet (400), and the preheating layer (110) located at the top is provided with an air outlet (200).

3. The pyrolysis furnace according to claim 2, characterized in that: The cavity wall of the pyrolysis layer (120) is provided with a first heating channel; And / or, the material shifting member (500) has a second shifting portion located in the pyrolysis layer (120), and the material shifting member (500) also has a second heating channel (530) at least partially distributed in the second shifting portion.

4. The pyrolysis furnace according to claim 3, characterized in that: The pyrolysis furnace further comprises a partition, the furnace body (100) has an inner cavity, and the partition is arranged in the inner cavity to divide the inner cavity from top to bottom into the preheating layer (110), the pyrolysis layer (120) and the cooling layer (130); The material moving member (500) comprises a main shaft (510) and a plurality of scrapers (520), wherein the plurality of scrapers (520) are arranged on the main shaft (510), the scrapers (520) located in the preheating layer (110) form a third moving part; the scrapers (520) located in the pyrolysis layer (120) form the second moving part, and the scrapers (520) located in the cooling layer (130) form the first moving part.

5. The pyrolysis furnace according to claim 4, characterized in that: The partition comprises n furnace plates, and the n furnace plates are sequentially arranged at intervals from the upper end of the furnace body (100) to the lower end of the furnace body (100), and n is a natural number, and n≥2; Each of the furnace plates has a material drop opening, the furnace plate located at the nth layer is a central material drop opening (600), and the furnace plate located at the n+1th layer is an edge material drop opening (700), the material drop opening of the central material drop opening (600) is located in the middle thereof and forms a central material drop opening (610), and the material drop opening of the edge material drop opening (700) is located at the edge thereof and forms an edge material drop opening (710).

6. The pyrolysis furnace according to claim 5, characterized in that: The movement of the scraper (520) is configured to be able to apply a driving force to the material to move toward the drop opening on the furnace plate corresponding to it.

7. The pyrolysis furnace according to claim 5, characterized in that: The edge blanking plate (700) is installed on the main shaft (510), and the edge blanking plate (700) is provided with a plurality of edge blanking openings (710) in a circumferential direction; Wherein, the second heating channel (530) is also distributed at the edge drop tray (700) located at the pyrolysis layer (120).

8. The pyrolysis furnace according to claim 5, characterized in that: The edge blanking plate (700) has a mounting hole (720) in the middle, and the main shaft (510) is inserted into the mounting hole (720) and the central blanking opening (610); Wherein, a shielding portion (800) is provided on the main shaft (510) at the mounting hole (720), and the mounting hole (720) is located within a coverage area of ​​the shielding portion (800) in the axial projection of the main shaft (510).

9. The pyrolysis furnace according to any one of claims 5 to 8, characterized in that The upward end of the furnace plate is arranged as an inclined surface, and the inclined surface is configured to enable the material located thereon to have a tendency to move toward the corresponding drop opening.

10. The pyrolysis furnace according to claim 9, characterized in that: The portion of the second cooling channel located on the cavity wall of the cooling layer (130) is at least partially located inside the corresponding furnace plate; The portion of the first heating channel located on the cavity wall of the pyrolysis layer (120) is at least partially located inside the corresponding furnace plate.

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