A lithium battery rotary kiln with a thermal energy recovery mechanism

Abstract

The present invention discloses a lithium battery rotary kiln with a thermal energy recovery mechanism, which includes a kiln tail bin, a drag wheel mechanism, a driving mechanism, a rotary kiln body and a kiln head bin; one end of the rotary kiln body close to the kiln tail bin is provided with a first material guiding end, a cooling bin is arranged below the first material guiding end, a material guiding mechanism is arranged in the cooling bin, and a first heat exchange component is vertically inserted through the center of the material guiding mechanism; a thermal energy recovery bin is arranged below the drag wheel mechanism and the driving mechanism, and a first baffle and a second baffle are arranged inside the thermal energy recovery bin, so that the thermal energy recovery bin is sequentially separated into a dust removal cavity, a heat exchange cavity and a water storage cavity by the first baffle and the second baffle; a burner, a support plate and a feeding mechanism are arranged inside the kiln head bin. By respectively arranging a first material guiding end and a second material guiding end at both ends of the rotary kiln body, and arranging a mutually connected cooling bin and a thermal energy recovery bin below the rotary kiln body, the present invention can simultaneously realize the collaborative work of flue gas treatment, material cooling and prevention of material agglomeration by recovering thermal energy.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing rotary kilns, and particularly relates to a lithium battery rotary kiln with a heat energy recovery mechanism. Background Art

[0002] During the production process of lithium batteries, a rotary kiln is often used to sinter battery materials. When the existing lithium battery materials are injected into the inner cavity of the rotary kiln for sintering, agglomeration often occurs. Therefore, when the lithium battery materials are injected into the rotary kiln for sintering, local overburning or local undercooking phenomena will occur, reducing the uniformity of the sintered battery materials and affecting the quality of the battery materials. Moreover, during the sintering process of the battery material rotary kiln, a large amount of high-temperature flue gas will be generated at the tail end of the kiln. If directly discharged, it will not only cause waste of heat energy but also pollute the environment. Although the existing technology can recover heat energy through heat exchange to reduce the production energy consumption of the equipment, the recovered heat energy cannot be fully utilized, and the recovered heat energy cannot be used to establish coordinated work among the flue gas treatment equipment, material cooling equipment, and the structure for preventing material agglomeration. Summary of the Invention

[0003] The purpose of the present invention is to provide a lithium battery rotary kiln with a heat energy recovery mechanism to solve the problems mentioned in the above background art.

[0004] To achieve the above object, the solution of the present invention is: a lithium battery rotary kiln with a heat energy recovery mechanism, including a kiln tail bin, a drag wheel mechanism, a driving mechanism, a rotary kiln body and a kiln head bin; the kiln tail bin and the kiln head bin are respectively arranged at both ends of the rotary kiln body; the drag wheel mechanism and the driving mechanism are both arranged below the rotary kiln body and connected to the rotary kiln body for driving the rotary kiln body to rotate; one end of the rotary kiln body close to the kiln tail bin is provided with a first material guiding end, and a cooling bin is arranged below the first material guiding end. A material guiding mechanism is arranged in the cooling bin, and both ends of the material guiding mechanism are respectively communicated with the first material guiding end and the kiln tail bin. A first heat exchange component is vertically inserted through the center of the material guiding mechanism; a heat energy recovery bin is arranged below the drag wheel mechanism and the driving mechanism. A first baffle and a second baffle are arranged inside the heat energy recovery bin, so that the heat energy recovery bin is sequentially separated into a dust removal chamber, a heat exchange chamber and a water storage chamber by the first baffle and the second baffle; a filter is arranged below the first baffle, and an overflow hole is arranged on the second baffle; a heat exchange and dust removal component is arranged inside the dust removal chamber, and a second heat exchange component is arranged in the heat exchange chamber. The dust removal chamber is communicated with the inner cavity of the first material guiding end through a gas guide pipe, and the dust removal chamber is communicated with the inner cavity of the cooling bin through a water return pipe; a liquid extraction pump is arranged in the water storage chamber, and a coolant is filled in the water storage chamber; a three-way pipe is arranged outside the heat energy recovery bin, and three water inlets of the three-way pipe are respectively connected with a first water inlet pipe, a second water inlet pipe and a water injection pipe. The first water inlet pipe is communicated with the first heat exchange component, the second water inlet pipe is communicated with the heat exchange and dust removal component, and the water injection pipe is communicated with the liquid extraction pump, so that the liquid extraction pump injects the coolant in the water storage chamber into the three-way pipe through the water injection pipe and respectively introduces it into the first heat exchange component and the heat exchange and dust removal component to cool the falling materials in the first material guiding end and perform dust removal heat exchange cooling on the high-temperature flue gas in the first material guiding end; one end of the second heat exchange component is connected with an inert gas pipe, and the other end of the second heat exchange component is communicated with the inner cavity of the second material guiding end through an injection gas pipe, so that the inert gas passes through the second heat exchange component for heat exchange and temperature rise and then is injected into the rotary kiln body through the second material guiding end; a burner, a support plate and a feeding mechanism are arranged inside the kiln head bin. The support plate is connected to the upper end of the inner cavity of the kiln head bin, and the burner is fixed above the support plate for generating high-temperature gas and injecting the high-temperature gas into the rotary kiln body; the feeding mechanism is fixed on one side of the support plate close to the second material guiding end for conveying the lithium battery materials to be processed into the rotary kiln body.

[0005] Further, the number of the drag wheel mechanisms is not less than 2; the driving mechanism is located between the drag wheel mechanisms; a limiting ring and a toothed ring connected to the drag wheel mechanism and the driving mechanism are arranged on the outer side of the rotary kiln body.

[0006] Further, a discharge port 61 is provided on one side of the second material guiding end close to the rotary kiln body, and a feed port is provided on one side of the second material guiding end close to the kiln head bin. Air guiding nets are provided on both sides of the second material guiding end between the discharge port and the feed port, and a gas collecting hood is provided outside the air guiding net inside the kiln head bin. The gas collecting hood is connected to an injection pipe, so that the inert gas flowing in the injection pipe is injected into the inner cavity of the second material guiding end through the gas collecting hood and enters the rotary kiln body. A feeding wheel is rotatably provided in the inner cavity of the second material guiding end, and a driving member for driving the feeding wheel to rotate is provided inside the kiln head bin. A gap is provided between the vanes of the feeding wheel for transporting the lithium battery materials to be processed.

[0007] Furthermore, the driving member is located inside the kiln head bin above the support plate. The driving member includes a first gear, a motor and a second gear. The motor is fixed at the top end inside the kiln head bin. The first gear is rotatably provided on the output shaft of the motor. One end of the rotating shaft of the feeding wheel extends into the kiln head bin, and the second gear is fixed on the rotating shaft of the feeding wheel and meshes with the first gear, so that when the motor drives the first gear to rotate, the second gear is engaged to drive the feeding wheel to rotate synchronously.

[0008] Further, the rotating shaft of the feeding wheel is a hollow shaft, and the heat conduction pipe of the burner passes through the hollow rotating shaft of the feeding wheel and extends into the inner cavity of the rotary kiln body.

[0009] Further, the material guiding mechanism includes an aggregate hopper and a first heat exchange coil. The first heat exchange coil is vertically arranged in the inner cavity of the cooling bin. The aggregate hopper is connected to the upper end of the first heat exchange coil, and the lower end of the first heat exchange coil is connected to the kiln tail bin.

[0010] Furthermore, a material guiding hopper is provided at the bottom of the inner cavity of the first material guiding end. The bottom end of the material guiding hopper is connected to a pipeline, and the bottom end of the pipeline extends into the material opening of the aggregate hopper.

[0011] Further, the first heat exchange component is a spray pipe, and nozzles are evenly provided on the spray pipe. The top end of the spray pipe is connected to a first water inlet pipe.

[0012] Further, the heat exchange and dust removal component is a spray seat, and nozzles are evenly provided at the bottom of the spray seat. The spray seat is connected to a second water inlet pipe.

[0013] Further, the second heat exchange component is a second heat exchange coil. The second heat exchange coil is arranged at the bottom end of the heat exchange cavity, and one end of the second heat exchange coil is connected to an external inert gas pipe, and the other end of the second heat exchange coil is connected to the injection pipe.

[0014] The beneficial effects of the present invention compared with the prior art are:

[0015] (1) In the present invention, a feeding end one and a feeding end two are respectively arranged at both ends of the rotary kiln body, and a cooling bin and a heat energy recovery bin that are interconnected are arranged below the rotary kiln body. The high-temperature flue gas generated during the operation of the rotary kiln body can be introduced into the dust removal chamber of the heat energy recovery bin through a gas guide pipe. Cooling water is sprayed by a spray seat two in the dust removal chamber to cool and remove dust from the flue gas. After the impurities in the smoke and dust are filtered by a filter, clean gas is discharged, reducing the impact on the environment. The replaced hot water will heat-exchange and heat the inert gas (nitrogen) flowing in the second heat exchange coil, so that the nitrogen is heated and then introduced into the gas collecting hood of the kiln head bin through a gas supply pipe. The inert gas can impact the lithium battery material conveyed inside the feeding end one, disperse the lithium battery material and conduct preliminary drying on it. This not only reduces the overburning or undercooking of the lithium battery material during sintering due to agglomeration, ensuring the uniformity of material sintering, but also can preheat and increase the temperature of the battery material, shortening the sintering time of the battery material and improving the sintering rate. At the same time, after the sintered lithium battery material is introduced into the cooling bin from the feeding end one, the surface temperature of the material on the first heat exchange coil can be taken away by the cold water sprayed by the spray seat one. This can not only achieve the purpose of cooling the material, but also displace the heat in the material with cold water, raising the temperature of the cold water. Then, the heated water body can be introduced into the heat energy recovery bin through a return pipe to be mixed with the hot water in the dust removal chamber for the heat exchange chamber to conduct secondary heat exchange on the inert gas flowing in the second heat exchange coil, fully recovering and utilizing the heat in the flue gas and sintered materials, reducing resource waste. At the same time, the effects of flue gas treatment, material cooling and preventing material agglomeration can be achieved, achieving the purpose of saving energy consumption and the coordinated operation of each component.

[0016] (2) In the present invention, a feeding wheel is arranged inside the feeding end one, and a gas collecting hood connected to the gas supply pipe and a driving member for driving the feeding wheel to rotate are arranged inside the kiln head bin. After the battery material is injected into the inside of the feeding end one, the driving member can drive the feeding wheel to rotate to push the material into the inner cavity of the rotary kiln body. When the heated inert gas (nitrogen) is introduced into the inside of the feeding end one through the gas collecting hood, it can impact the lithium battery material conveyed in the gap of the feeding wheel inside the feeding end one, fully dispersing the lithium battery material and preheating and preliminarily drying the material before the lithium battery material enters the rotary kiln body, thereby effectively reducing the agglomeration between the lithium battery materials and raising the initial processing temperature of the lithium battery materials, providing a basis for preventing overburning or undercooking of the materials and shortening the sintering rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view structural schematic diagram of the present invention;

[0018] Figure 2 is the front sectional structural schematic diagram of the present invention;

[0019] Figure 3 for the present invention Figure 2Schematic diagram of the enlarged structure at A in the [device / component name];

[0020] Figure 4 This is the sectional structure diagram of the second material guiding end of the present invention;

[0021] Figure 5 This is the sectional structure diagram of the cooling bin of the present invention.

[0022] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0023] Tail bin of the kiln 1, first material guiding end 2, material guiding hopper 21, air duct 22, towing wheel mechanism 3, driving mechanism 4, rotary kiln body 5, second material guiding end 6, discharge port 61, feeding wheel 62, feeding port 63, air guiding net 64, head bin of the kiln 7, gas collecting hood 71, first gear 72, motor 73, second gear 74, burner 75, support plate 76, feeding mechanism 77, cooling bin 8, first water inlet pipe 81, aggregate hopper 82, spray pipe 83, first heat exchange coil 84, return water pipe 85, heat energy recovery bin 9, three-way pipe 91, second water inlet pipe 92, water injection pipe 93, gas injection pipe 94, spray seat 95, filter 96, first baffle 97, second heat exchange coil 98, second baffle 99. Detailed implementation manners

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the attached drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the attached drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0025] Embodiment 1:

[0026] As Figures 1-5As shown in the figure, a lithium battery rotary kiln with a heat energy recovery mechanism includes a kiln tail bin 1, a drag wheel mechanism 3, a driving mechanism 4, a rotary kiln body 5, and a kiln head bin 7; the kiln tail bin 1 and the kiln head bin 7 are respectively arranged at both ends of the rotary kiln body 5; the drag wheel mechanism 3 and the driving mechanism 4 are both arranged below the rotary kiln body 5 and connected to the rotary kiln body 5 for driving the rotary kiln body 5 to rotate; one end of the rotary kiln body 5 close to the kiln tail bin 1 is provided with a first material guiding end 2, a cooling bin 8 is arranged below the first material guiding end 2, a material guiding mechanism is arranged in the cooling bin 8, and both ends of the material guiding mechanism are respectively communicated with the first material guiding end 2 and the kiln tail bin 1, and a first heat exchange component is vertically inserted through the center of the material guiding mechanism; a heat energy recovery bin 9 is arranged below the drag wheel mechanism 3 and the driving mechanism 4, and a first baffle 97 and a second baffle 99 are arranged inside the heat energy recovery bin 9, so that the heat energy recovery bin 9 is sequentially separated into a dust removal chamber, a heat exchange chamber, and a water storage chamber by the first baffle 97 and the second baffle 99; a filter 96 is arranged below the first baffle 97, and an overflow hole is arranged on the second baffle 99; a heat exchange and dust removal component is arranged inside the dust removal chamber, and a second heat exchange component is arranged in the heat exchange chamber. The dust removal chamber is communicated with the inner cavity of the first material guiding end 2 through a gas guide pipe 22, and the dust removal chamber is communicated with the inner cavity of the cooling bin 8 through a water return pipe 85; a liquid extraction pump is arranged in the water storage chamber, and a coolant is filled in the water storage chamber; a three-way pipe 91 is arranged outside the heat energy recovery bin 9, and three water ports of the three-way pipe 91 are respectively connected with a first water inlet pipe 81, a second water inlet pipe 92, and a water injection pipe 93. The first water inlet pipe 81 is communicated with the first heat exchange component, the second water inlet pipe 92 is communicated with the heat exchange and dust removal component, and the water injection pipe 93 is communicated with the liquid extraction pump, so that the liquid extraction pump injects the coolant in the water storage chamber into the three-way pipe 91 through the water injection pipe 93, and the coolant is respectively introduced into the first heat exchange component and the heat exchange and dust removal component through the three-way pipe 91 to cool the falling materials in the first material guiding end 2 and perform dust removal, heat exchange, and cooling on the high-temperature flue gas in the first material guiding end 2; one end of the second heat exchange component is connected with an inert gas pipe, and the other end of the second heat exchange component is communicated with the inner cavity of the second material guiding end 6 through an air injection pipe 94, so that the inert gas is heated through heat exchange by the second heat exchange component and then injected into the rotary kiln body 5 through the second material guiding end 6; a burner 75, a support plate 76, and a feeding mechanism 77 are arranged inside the kiln head bin 7. The support plate 76 is connected to the upper end of the inner cavity of the kiln head bin 7, and the burner 75 is fixed above the support plate 76 for generating high-temperature gas and injecting the high-temperature gas into the rotary kiln body 5; the feeding mechanism 77 is fixed on one side of the support plate 76 close to the second material guiding end 6 for conveying the lithium battery materials to be processed into the rotary kiln body 5; wherein, a material scraping bar (not marked in the figure) is arranged on the inner wall of the rotary kiln body 5, so that the lithium battery materials can be lifted and scattered by the rotating material scraping bar during processing inside the rotary kiln body 5, avoiding the phenomenon of battery material accumulation and sticking.Both ends of the rotary kiln body 5 are provided with connecting rings (not marked in the figure) for connecting the first feeding end 2 and the second feeding end 6, so that the rotary kiln body 5 can rotate stably between the first feeding end 2 and the second feeding end 6 under the action of the idler wheel mechanism 3 and the driving mechanism 4;

[0027] As shown in Figure 2, in this embodiment, the material guiding mechanism includes a material collecting hopper 82 and a first heat exchange coil pipe 84. The first heat exchange coil pipe 84 is vertically arranged in the inner cavity of the cooling bin 8. The material collecting hopper 82 is connected to the upper end of the first heat exchange coil pipe 84, and the lower end of the first heat exchange coil pipe 84 is communicated with the kiln tail bin 1. In this embodiment, a material guiding hopper 21 is arranged at the bottom of the inner cavity of the first material guiding end 2. The bottom end of the material guiding hopper 21 is connected with a pipeline, and the bottom end of this pipeline extends to the material inlet of the material collecting hopper 82. In this embodiment, the first heat exchange component is a spray pipe 83, and nozzles are evenly arranged on the spray pipe 83. The top end of the spray pipe 83 is communicated with a first water inlet pipe 81. In this embodiment, the heat exchange and dust removal component is a spray seat 95, and nozzles are evenly arranged at the bottom of the spray seat 95. The spray seat 95 is communicated with a second water inlet pipe 92. In this embodiment, the second heat exchange component is a second heat exchange coil pipe 98. The second heat exchange coil pipe 98 is arranged at the bottom end of the heat exchange cavity, and one end of the second heat exchange coil pipe 98 is connected with an external inert gas pipe, and the other end of the second heat exchange coil pipe 98 is connected with an injection gas pipe 94. When rotating between the first material guiding end 2 and the second material guiding end 6 under the action of the idler wheel mechanism 3 and the driving mechanism 4, the lithium battery materials to be processed in the kiln head bin 7 will be sent into the second material guiding end 6 through the feeding mechanism 77, and then introduced into the inner cavity of the rotary kiln body 5 through the second material guiding end 6, so that the heat generated by the combustion of the burner 75 can sinter the lithium battery materials in the inner cavity of the rotary kiln body 5. The high-temperature flue gas generated by sintering will be introduced into the dust removal cavity of the heat energy recovery bin 9 through the gas guide pipe 22 of the first material guiding end 2. The sintered lithium battery materials will be introduced into the material collecting hopper 82 through the material guiding hopper 21 of the first material guiding end 2 and then sent into the first heat exchange coil pipe 84. After the high-temperature flue gas enters the dust removal cavity, the water pump in the water storage cavity will pump the coolant into the injection water pipe 93 and introduce it into the first water inlet pipe 81 and the second water inlet pipe 92 respectively through the three-way pipe 91. Among them, the first water inlet pipe 81 will inject the coolant into the spray pipe 83, and the coolant will be sprayed onto the surface of the first heat exchange coil pipe 84 through the nozzles on the spray pipe 83 to perform heat exchange and cooling on the high-temperature lithium battery materials conveyed in the first heat exchange coil pipe 84, so that the sintered lithium battery materials can be cooled and then sent into the kiln tail bin 1.The water inlet pipe two 92 injects the coolant into the spray seat 95 and atomizes and sprays the coolant through the nozzles of the spray seat 95, so as to wrap and settle the impurities in the high-temperature flue gas and reduce the temperature of the flue gas, enabling the turbid coolant accumulated in the dust removal cavity after spraying to be heated up by the heat energy of the flue gas. After being filtered by the filter 96, the heated turbid coolant can exchange heat with and heat the inert gas (nitrogen) flowing in the heat exchange coil two 98. After the nitrogen is heated up, it is introduced into the feeding end two 6 through the injection pipe 94 to preheat and heat up the lithium battery material in the feeding end two 6. As the nitrogen enters the inner cavity of the rotary kiln body 5 along with the heated lithium battery material, it can not only preheat and preliminarily dry the lithium battery material by recycling the heat energy, prevent the lithium battery material from agglomerating, ensure the shortening of the sintering time of the battery material, and improve the sintering rate of the battery material in the rotary kiln body 5, but also ensure that the lithium battery material can be stably sintered under the action of nitrogen, guaranteeing the stability of the sintering of the lithium battery material in the rotary kiln body 5. At the same time, the liquid after heat exchange in the heat exchange cavity will gradually cool down. After the cooled water body rises to the overflow port of the baffle two 99, it will enter the water storage cavity for reuse. Through the setting of the heat energy recovery bin 9, the whole device can fully recover and utilize the high temperature generated by the sintering of the rotary kiln body 5, and at the same time achieve the effects of flue gas treatment, material cooling and preventing material agglomeration, so as to achieve the purpose of saving energy consumption.

[0028] As shown in the claims Figure 1 In this embodiment, as shown, the number of the idler wheel mechanisms 3 is not less than 2; the driving mechanism 4 is located between the idler wheel mechanisms 3; a limiting ring and a toothed ring connected to the idler wheel mechanisms 3 and the driving mechanism 4 are provided on the outer side of the rotary kiln body 5. Among them, the idler wheel mechanism 3 and the driving mechanism 4 can drive the rotary kiln body 5 to rotate stably, and both belong to the prior art and will not be described in detail here.

[0029] As Figure 3As shown, in this embodiment, a discharge port 61 is provided on one side of the second material guiding end 6 close to the rotary kiln body 5, and a feed port 63 is provided on one side of the second material guiding end 6 close to the kiln head bin 7. Air guiding nets 64 are provided on both sides of the second material guiding end 6 between the discharge port 61 and the feed port 63, and a gas collecting hood 71 is provided outside the air guiding net 64 inside the kiln head bin 7. The gas collecting hood 71 is communicated with the injection gas pipe 94, so that the inert gas flowing in the injection gas pipe 94 is injected into the inner cavity of the second material guiding end 6 through the gas collecting hood 71 and enters the inside of the rotary kiln body 5; a feeding wheel 62 is rotatably provided in the inner cavity of the second material guiding end 6, and a driving member for driving the feeding wheel 62 to rotate is provided inside the kiln head bin 7. A gap is provided between the vanes of the feeding wheel 62 for transporting the lithium battery materials to be processed; among them, after the lithium battery materials to be processed are injected into the second material guiding end 6 through the feeding mechanism 77, they can remain in the gaps between the vanes of the feeding wheel 62. As the driving member in the kiln head bin 7 operates, the feeding wheel 62 can be driven to rotate, and then the lithium battery materials to be processed are pushed from one end of the feed port 63 to one end of the discharge port 61 and injected into the inner cavity of the rotary kiln body 5; the arrangement of the gas collecting hood 71 and the air guiding net 64 enables the heated nitrogen to be injected into the second material guiding end 6 to continuously wash the lithium battery materials to be processed, so as to fully disperse the lithium battery materials transported inside the second material guiding end 6 and preheat and preliminarily dry the materials, effectively preventing the agglomeration phenomenon from occurring when the lithium battery materials are sintered in the inner cavity of the rotary kiln body 5, avoiding overburning or undercooking of the battery materials, and ensuring the uniformity of material sintering;

[0030] In this embodiment, the driving member is inside the kiln head bin 7 above the support plate 76. The driving member includes a first gear 72, a motor 73 and a second gear 74; the motor 73 is fixed at the top end inside the kiln head bin 7; the first gear 72 is rotatably arranged on the output shaft of the motor 73; one end of the rotating shaft of the feeding wheel 62 extends into the kiln head bin 7, and the second gear 74 is fixed on the rotating shaft of the feeding wheel 62 and meshes with the first gear 72, so that when the motor 73 drives the first gear 72 to rotate, the second gear 74 is engaged to drive the feeding wheel 62 to rotate synchronously; among them, the driving member composed of the first gear 72, the motor 73 and the second gear 74 can drive the first gear 72 to rotate by the motor 73 and engage the second gear 74 to drive the feeding wheel 62 to rotate synchronously, and then the stable transportation of the lithium battery materials to be processed inside the second material guiding end 6 is realized through the rotation of the feeding wheel 62; in this embodiment, the rotating shaft of the feeding wheel 62 is a hollow shaft, and the heat conduction pipe of the burner 75 passes through the hollow rotating shaft of the feeding wheel 62 and extends into the inner cavity of the rotary kiln body 5; among them, the rotating shaft of the feeding wheel 62 with a special shape will neither affect its own rotation nor affect the heat conduction of the burner 75, ensuring that both the feeding wheel 62 and the burner 75 can be used independently;

[0031] In summary, for the lithium battery rotary kiln with a heat energy recovery mechanism provided by the present invention, by respectively arranging a feeding end one 2 and a feeding end two 6 at both ends of the rotary kiln body 5, and arranging a cooling chamber 8 and a heat energy recovery chamber 9 which are communicated with each other below the rotary kiln body 5, the high-temperature flue gas generated during the operation of the rotary kiln body 5 can be introduced into the dust removal chamber of the heat energy recovery chamber 9 through the gas guide pipe 22. The flue gas is cooled and dust-removed by spraying cooling water through the spray seat 95 in the dust removal chamber, and after filtering the impurities in the soot through the filter 96, the clean gas is discharged, reducing the impact on the environment; and the replaced hot water will heat-exchange and heat the inert gas (nitrogen) flowing in the second heat exchange coil 98, so that the nitrogen is heated and then introduced into the gas collecting hood 71 of the kiln head bin 7 through the injection pipe 94, so that the inert gas can impact the lithium battery materials conveyed inside the feeding end two 6, break up the lithium battery materials and preliminarily dry them. This not only reduces the over-burning or undercooking of the lithium battery materials during sintering due to agglomeration, ensures the uniformity of material sintering, but also can preheat to increase the temperature of the battery materials, shorten the sintering time of the battery materials, and improve the sintering rate; at the same time, after the sintered lithium battery materials are introduced into the cooling chamber 8 from the feeding end one 2, the surface temperature of the materials in the first heat exchange coil 84 can be taken away by spraying cold water through the spray pipe 83. This can not only achieve the purpose of cooling the materials, but also displace the heat in the materials by the cold water, so that the cold water is heated, so that the heated water body can be introduced into the heat energy recovery chamber 9 through the return pipe 85 to be mixed with the hot water in the dust removal chamber for the heat exchange chamber to conduct secondary heat exchange on the inert gas flowing in the second heat exchange coil 98, fully recover and utilize the heat in the flue gas and the sintered materials, reduce resource waste, and at the same time can achieve the effects of flue gas treatment, material cooling and preventing material agglomeration, achieving the purpose of saving energy consumption and the coordinated operation of each component.

[0032] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A lithium battery rotary kiln with a heat energy recovery mechanism, comprising a kiln tail bin (1), a drag wheel mechanism (3), a driving mechanism (4), a rotary kiln body (5) and a kiln head bin (7); the kiln tail bin (1) and the kiln head bin (7) are respectively arranged at two ends of the rotary kiln body (5); the drag wheel mechanism (3) and the driving mechanism (4) are both arranged below the rotary kiln body (5) and connected to the rotary kiln body (5) for driving the rotary kiln body (5) to rotate; it is characterized in that: One end of the rotary kiln body (5) close to the kiln tail bin (1) is provided with a first material guiding end (2). A cooling bin (8) is arranged below the first material guiding end (2). A material guiding mechanism is arranged in the cooling bin (8). Two ends of the material guiding mechanism are respectively communicated with the first material guiding end (2) and the kiln tail bin (1). A first heat exchange assembly is vertically inserted through the center of the material guiding mechanism. A heat energy recovery bin (9) is arranged below the idler wheel mechanism (3) and the driving mechanism (4). A first baffle (97) and a second baffle (99) are arranged inside the heat energy recovery bin (9), so that the heat energy recovery bin (9) is sequentially divided into a dust removal chamber, a heat exchange chamber and a water storage chamber by the first baffle (97) and the second baffle (99). A filter (96) is arranged below the first baffle (97). An overflow hole is arranged on the second baffle (99). A heat exchange and dust removal assembly is arranged inside the dust removal chamber. A second heat exchange assembly is arranged in the heat exchange chamber. The dust removal chamber is communicated with the inner cavity of the first material guiding end (2) through a gas guide pipe (22), and the dust removal chamber is communicated with the inner cavity of the cooling bin (8) through a water return pipe (85). A liquid extraction pump is arranged in the water storage chamber, and a coolant is filled in the water storage chamber. A three-way pipe (91) is arranged outside the heat energy recovery bin (9). Three water inlets of the three-way pipe (91) are respectively connected with a first water inlet pipe (81), a second water inlet pipe (92) and a water injection pipe (93). The first water inlet pipe (81) is communicated with the first heat exchange assembly. The second water inlet pipe (92) is communicated with the heat exchange and dust removal assembly. The water injection pipe (93) is communicated with the liquid extraction pump, so that the liquid extraction pump injects the coolant in the water storage chamber into the three-way pipe (91) through the water injection pipe (93), and the coolant is respectively introduced into the first heat exchange assembly and the heat exchange and dust removal assembly through the three-way pipe (91) to cool the materials falling in the first material guiding end (2) and perform dust removal, heat exchange and cooling on the high-temperature flue gas in the first material guiding end (2). One end of the second heat exchange assembly is connected with an inert gas pipe, and the other end of the second heat exchange assembly is communicated with the inner cavity of the second material guiding end (6) through an air injection pipe (94), so that the inert gas is heated through heat exchange of the second heat exchange assembly and then injected into the rotary kiln body (5) through the second material guiding end (6). Inside the kiln head bin (7), a burner (75), a support plate (76) and a feeding mechanism (77) are arranged. The support plate (76) is connected to the upper end of the inner cavity of the kiln head bin (7). The burner (75) is fixed above the support plate (76) and is used for generating high-temperature gas and injecting the high-temperature gas into the rotary kiln body (5). The feeding mechanism (77) is fixed on one side of the support plate (76) close to the second material guiding end (6) and is used for conveying the lithium battery material to be processed into the rotary kiln body (5).

2. The lithium battery rotary kiln with a heat energy recovery mechanism according to claim 1, characterized in that: The number of the idler wheel mechanisms (3) is not less than 2. The driving mechanism (4) is located between the idler wheel mechanisms (3). A limiting ring and a toothed ring connected with the idler wheel mechanism (3) and the driving mechanism (4) are arranged on the outer side of the rotary kiln body (5).

3. A lithium battery rotary kiln with a heat energy recovery mechanism as described in claim 1 or 2, characterized in that: On one side of the second material guiding end (6) close to the rotary kiln body (5), there is a discharge port 61, and on one side of the second material guiding end (6) close to the kiln head bin (7), there is a feed port (63). On both sides of the second material guiding end (6) between the discharge port (61) and the feed port (63), there are air guiding nets (64). And outside the air guiding net (64) inside the kiln head bin (7), there is a gas collecting hood (71). The gas collecting hood (71) is connected to the injection gas pipe (94), so that the inert gas flowing in the injection gas pipe (94) is injected into the inner cavity of the second material guiding end (6) through the gas collecting hood (71) and enters the inside of the rotary kiln body (5). In the inner cavity of the second material guiding end (6), there is a feeding wheel (62) rotatably arranged, and inside the kiln head bin (7), there is a driving member for driving the feeding wheel (62) to rotate. There are gaps between the vanes of the feeding wheel (62) for transporting the lithium battery materials to be processed.

4. The rotary kiln for lithium batteries with a heat energy recovery mechanism according to claim 3, characterized in that: The driving member is located inside the kiln head bin (7) above the support plate (76). The driving member includes a first gear (72), a motor (73) and a second gear (74). The motor (73) is fixed at the top end inside the kiln head bin (7). The first gear (72) is rotatably arranged on the output shaft of the motor (73). One end of the rotating shaft of the feeding wheel (62) extends into the inside of the kiln head bin (7), and the second gear (74) is fixed on the rotating shaft of the feeding wheel (62) and meshes with the first gear (72). When the motor (73) drives the first gear (72) to rotate, the meshing second gear (74) drives the feeding wheel (62) to rotate synchronously.

5. The rotary kiln for lithium batteries with a heat energy recovery mechanism according to claim 4, wherein: The rotating shaft of the feeding wheel (62) is a hollow shaft, and the heat conduction pipe of the burner (75) passes through the hollow rotating shaft of the feeding wheel (62) and extends to the inner cavity of the rotary kiln body (5).

6. The rotary kiln for lithium batteries with a thermal energy recovery mechanism as claimed in claim 1 or 2, characterized in that: The material guiding mechanism includes a collecting hopper (82) and a first heat exchange coil pipe (84). The first heat exchange coil pipe (84) is vertically arranged in the inner cavity of the cooling bin (8). The collecting hopper (82) is connected to the upper end of the first heat exchange coil pipe (84), and the lower end of the first heat exchange coil pipe (84) is connected to the kiln tail bin (1).

7. The rotary kiln for lithium batteries with a thermal energy recovery mechanism according to claim 6, wherein: At the bottom of the inner cavity of the first material guiding end (2), there is a material guiding hopper (21). The bottom end of the material guiding hopper (21) is connected with a pipeline, and the bottom end of this pipeline extends into the material opening of the collecting hopper (82).

8. The rotary kiln for lithium batteries with a heat energy recovery mechanism according to claim 6, characterized in that: The first heat exchange component is a spray pipe (83). The spray pipe (83) is evenly provided with nozzles. The top end of the spray pipe (83) is connected to the first water inlet pipe (81).

9. The rotary kiln for lithium batteries with a thermal energy recovery mechanism according to claim 1 or 2, characterized in that: The heat exchange and dust removal component is a spray seat (95). The bottom of the spray seat (95) is evenly provided with nozzles. The spray seat (95) is connected to the second water inlet pipe (92).

10. A lithium battery rotary kiln with a heat energy recovery mechanism as described in claim 1 or 2, characterized in that: The second heat exchange component is a second heat exchange coil pipe (98). The second heat exchange coil pipe (98) is arranged at the bottom end of the heat exchange cavity. And one end of the second heat exchange coil pipe (98) is connected to an external inert gas pipe, and the other end of the second heat exchange coil pipe (98) is connected to the injection gas pipe (94).

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