Device for cooling iron phosphate for lithium battery

Abstract

The utility model relates to a device for cooling iron phosphate for a lithium battery. The device comprises a cooling cylinder, a feeding central pipe, a discharging central pipe and a supporting system, at least one heat exchange layer is arranged in the cooling cylinder in the circumferential direction, and each heat exchange layer comprises a plurality of evenly-distributed heat exchange pipes. A transmission device for rotating the cooling cylinder is arranged outside the cooling cylinder; the feeding central pipe, the discharging central pipe and the cooling cylinder are coaxially arranged; the two ends of each heat exchange pipe penetrate through the annular end plates to communicate with the feeding side air chamber and the discharging side air chamber correspondingly. And the discharging central pipe and the feeding central pipe are not communicated with the heat exchange pipe. Cooled materials in the cooling cylinder are in indirect contact with cold air in the heat exchange pipes for heat exchange, the contact area is large, the heat exchange efficiency is high, the processing capacity is large, the filling rate of the materials in the cooling cylinder is higher than that of a conventional cooling furnace, and the retention time of the materials can be adjusted. And the heated air can be used as combustion-supporting air, so that energy is saved. And compared with cooling water, the consumption cost of public works is low.

Description

Technical Field

[0001] The utility model relates to the field of cooling devices, in particular to a device for cooling iron phosphate for lithium batteries. Background Art

[0002] In the lithium battery industry, the temperature of solid iron phosphate materials after roasting is relatively high. After cooling the materials using an integrated calcination / roasting + cooling furnace, the temperature of the materials is difficult to reach below 60°C. In addition, iron phosphate powders have small particle sizes and large specific surface areas. The moisture content after roasting is generally required to be at the ppm level, and it is easy to absorb moisture from the air during the cooling process.

[0003] The traditional method is to cool the material by spraying cooling water on the outer wall of the horizontal cylinder or adding a cooling air jacket outside the cylinder. The contact area between the cooling water or cooling air and the material per unit length is very small, and it cannot be guaranteed that all materials can be indirectly in contact with the cooling water or cooling air. There are problems such as low heat exchange efficiency and high equipment investment cost. When a cooling spiral with a jacket is used, there are problems such as short material residence time and difficulty in cooling to the required packaging temperature. Utility Model Content

[0004] The utility model aims to overcome the problems of low cooling efficiency in the cooling method of iron phosphate materials for lithium batteries in the prior art.

[0005] To this end, the utility model provides the following technical solutions:

[0006] A device for cooling iron phosphate for lithium batteries, comprising:

[0007] A cooling cylinder, wherein at least one heat exchange layer is arranged inside the cooling cylinder along the circumferential direction, and each heat exchange layer comprises a plurality of evenly distributed heat exchange tubes; and a transmission device for rotating the cooling cylinder is arranged outside the cooling cylinder;

[0008] The feeding central tube, one end of which is close to the cooling cylinder, is flush with the feeding end of the cooling cylinder in the vertical direction or extends into the cooling cylinder by a distance of ≤100mm (i.e., the distance that one end of the feeding central tube extends into the cooling cylinder is ≤100mm);

[0009] The other end of the discharge center pipe close to the cooling cylinder is flush with the discharge end of the cooling cylinder in the vertical direction or extends into the cooling cylinder by a distance of ≤100mm (i.e., the other end of the discharge center pipe extends into the cooling cylinder by a distance of ≤100mm);

[0010] A support system is respectively arranged at both ends of the cooling cylinder and is rotatably connected to the feed center pipe and the discharge center pipe;

[0011] The feed center tube and the discharge center tube are coaxially arranged with the cooling cylinder, and the diameters of the feed center tube and the discharge center tube are both smaller than the diameter of the cooling cylinder;

[0012] Both ends of each heat exchange tube pass through annular end plates and are connected to a feed side air chamber and a discharge side air chamber respectively; and the discharge center tube is not connected to the heat exchange tube, and the feed center tube is not connected to the heat exchange tube.

[0013] At least one heat exchange layer consisting of a plurality of evenly distributed heat exchange tubes is arranged in the circumferential direction inside the cooling cylinder, and the two ends of each heat exchange tube are respectively connected to the feed side air chamber and the discharge side air chamber through the annular end plate; and the discharge center tube and the feed center tube are not connected to the heat exchange tube. In this way, the air passes through the tube and the cooled material passes through the shell. There is no contact between the air and the material to be cooled, and the exhaust gas dust removal system is not required, which reduces the equipment investment. During the rotation of the cooling cylinder, the material to be cooled in the cooling cylinder is indirectly contacted and heat-exchanged with the air in the heat exchange tube. After being heated by the material, the cold air can be used as combustion air for waste heat recovery, which saves energy and reduces consumption on the one hand, and reduces the operating cost of the equipment on the other hand. The device can indirectly cool the iron phosphate material in the lithium battery industry, with large processing capacity and high heat exchange efficiency.

[0014] The support system mentioned above can be any conventional support system in the industry, such as rollers, bearings, etc.

[0015] In one embodiment, the annular end plate includes a first annular end plate and a second annular end plate; the first annular end plate is fixedly connected to the feed end of the cooling cylinder and the feed center pipe respectively; the second annular end plate is fixedly connected to the discharge end of the cooling cylinder and the discharge center pipe respectively;

[0016] One end of each of the heat exchange tubes passes through the first annular end plate to communicate with the feed-side air chamber, and the other end passes through the second annular end plate to communicate with the discharge-side air chamber.

[0017] In one embodiment, the support system includes a sleeve, a bearing, a bearing seat, etc.;

[0018] The shaft sleeves are respectively interference fit or fixedly connected with the feed center tube and the discharge center tube.

[0019] In one embodiment, the sleeve is sealed and fixedly connected to the feed center tube and the discharge center tube. The specific sealing and fixing method is not limited. The sleeve and the feed center tube / discharge center tube can be sealed by conventional methods in the industry to prevent material leakage.

[0020] The first annular end plate and the second annular end plate are rotatably sealed and fixedly connected to the feed center pipe and the discharge center pipe respectively through the shaft sleeve, that is, the two ends of the cooling cylinder and the feed center pipe and the discharge center pipe are supported by bearings, and the support structure of rollers and supporting wheels is not used, thereby reducing equipment investment and maintenance work.

[0021] In one embodiment, the first annular end plate is parallel to the second annular end plate in a vertical direction.

[0022] In one embodiment, the shapes of the heat exchange tubes in each heat exchange layer are the same or different.

[0023] In one embodiment, the shape of the heat exchange tubes in each of the heat exchange layers is selected from a circle, a polygon or a triangle.

[0024] In one embodiment, the shapes of the heat exchange tubes in each of the heat exchange layers are all circular (the shapes of the corresponding heat exchange tubes in each layer are all circular), and are coaxially arranged.

[0025] In one embodiment, the device further comprises a feeding mechanism and a discharging mechanism;

[0026] The feeding mechanism is connected to the cooling cylinder via the feeding center pipe; the cooling cylinder is connected to the discharging mechanism via the discharging center pipe.

[0027] In one embodiment, the feeding mechanism is sealedly connected to the feeding central tube;

[0028] The discharge center pipe is sealedly connected to the discharge mechanism.

[0029] In one embodiment, the feeding mechanism is selected from a chute feeding device, a feeding box or a screw feeding device;

[0030] The discharging mechanism is selected from a spiral discharging device, a discharging box or a spiral discharging device.

[0031] In one embodiment, the transmission device adopts gear transmission or friction pair transmission.

[0032] The utility model provides a device for cooling iron phosphate for lithium batteries. The material to be cooled in the feeding mechanism enters the cooling cylinder through the feeding center pipe, and the cold air enters the heat exchange tube connected thereto through the discharge side air chamber. The high-temperature material to be cooled in the cooling cylinder and the cold air are in countercurrent indirect contact. Then, during the rotation of the cooling cylinder, the material to be cooled and the cold air in each heat exchange tube are in indirect contact for heat exchange, thereby increasing the heat exchange area and the heat exchange efficiency. The cooled material is discharged from the cooling cylinder through the discharge center pipe and enters the discharge mechanism. The heated air in the heat exchange tube is discharged through the feeding side air chamber and can be used as combustion air for waste heat recovery. During the entire rotation process, the two ends of the cooling cylinder and the feeding center pipe and the discharge center pipe are supported by bearings, and the support structure of rollers and supporting wheels is not used, thereby reducing equipment investment and maintenance work.

[0033] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0034] The utility model provides a device for cooling iron phosphate for lithium batteries. By arranging at least one heat exchange layer composed of a plurality of evenly distributed heat exchange tubes in the circumferential direction inside the cooling cylinder, during the rotation of the cooling cylinder, the cooled material in the cooling cylinder and the cold air in the heat exchange tubes are indirectly contacted for heat exchange. The area of ​​indirect contact between the cooled material and the cold air in the heat exchange tubes is large, the heat exchange efficiency is high, and the processing capacity is large. The material filling rate in the cooling cylinder is higher than that of a conventional cooling furnace, and the material residence time is adjustable. The heated air can be used as combustion-supporting air to save energy. Compared with cooling water, the utility consumption cost is low. In addition, the device for cooling iron phosphate for lithium batteries is not only suitable for powdered materials, but also for small particle materials, and has a large processing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a device for cooling iron phosphate for lithium batteries provided by the utility model;

[0036] Figure 2 for Figure 1 A cross-sectional view of the support system at the connection between the sleeve and the feed center pipe;

[0037] Figure 3 To adopt Figure 1 The device shown is a schematic diagram of a method for cooling iron phosphate for lithium batteries.

[0038] Description of reference numerals:

[0039] 1. Cooling cylinder; 2. Feed box; 3. Feed support system; 4. Heat exchange tube; 5. Discharge support system; 6. Transmission device; 7. Feed side air chamber; 8. Discharge side air chamber; 9. Discharge box; 10. First annular end plate; 11. Second annular end plate; 12. Feed center tube; 13. Bushing; 14. High-temperature material; 15. Low-temperature material; 16. Hot air; 17. Cold air. DETAILED DESCRIPTION

[0040] The following is a detailed description of the embodiments of the present invention: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and process are given, but the protection scope of the present invention is not limited to the following embodiments. The experimental methods in the following embodiments that do not specify specific conditions are usually based on conventional conditions.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the term "external" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description or simplified description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] like Figure 1 As shown, a device for cooling iron phosphate for lithium batteries includes a feed box 2, a feed center pipe 12, a feed side air chamber 7, a feed support system 3, a cooling cylinder 1, a discharge center pipe, a discharge support system 5, a discharge side air chamber 8 and a discharge box 9;

[0043] The interior of the cooling cylinder 1 is provided with 4 heat exchange layers along the circumferential direction, each heat exchange layer is composed of a large number of evenly distributed heat exchange tubes 4, and the heat exchange tubes 4 of each layer form a circle and form a coaxially arranged concentric circle with the cooling cylinder 1 (the shape of the heat exchange tubes in each heat exchange layer can be the same or different, such as polygonal, triangular, etc., not limited to a circle); the outside of the cooling cylinder 1 is provided with a transmission device 6 for rotating the cooling cylinder 1, and the transmission device 6 can specifically select a conventional gear transmission or friction pair transmission in the industry;

[0044] Combined with Figure 2As shown, the feed box 2 (the conventional screw feed device or chute feed device in the industry can also be used) is sealed and connected to the feed center pipe 12. The feed center pipe 12 is located at one end close to the cooling cylinder 1 and is flush with the feed end of the cooling cylinder 1 in the vertical direction (it can also be slightly extended into the cooling cylinder, as long as the extension distance does not exceed 100mm); the feed support system 3 is arranged at the feed end of the cooling cylinder 1 and is rotatably connected to the feed center pipe 12. The first annular end plate 10 is fixedly connected to the feed end of the cooling cylinder 1, and is rotatably and sealedly connected to the feed center pipe 12 through the shaft sleeve 10 in the feed support system 3. One end of each heat exchange tube 4 passes through the first annular end plate 10 and is connected to the feed side air chamber 7.

[0045] The discharge support system 5 is arranged at the discharge end of the cooling cylinder 1 and is rotatably connected to the discharge center tube. The second annular end plate 11 is fixedly connected to the discharge end of the cooling cylinder 1 and is rotatably and sealedly connected to the discharge center tube via the shaft sleeve 10 in the discharge support system 5. The other end of each heat exchange tube 4 passes through the second annular end plate 11 and is connected to the discharge side air chamber 8; the discharge center tube is connected to the discharge box 9 (a conventional spiral discharge device or chute discharge device in the industry can also be used), and the discharge center tube is located at one end close to the cooling cylinder 1 and is flush with the feed end of the cooling cylinder 1 in the vertical direction (it is also OK to extend slightly into the cooling cylinder, as long as the extension distance does not exceed 100mm).

[0046] The feed center tube 12 and the discharge center tube are coaxially arranged with the cooling cylinder 1 , and the diameters of the feed center tube 12 and the discharge center tube are both smaller than the diameter of the cooling cylinder 1 ; and the discharge center tube and the feed center tube 12 are not connected to the heat exchange tubes 4 .

[0047] like Figure 3 As shown, when the above device is used to cool the iron phosphate for lithium batteries, the high-temperature material 14 iron phosphate enters the cooling cylinder through the feed box and the feed center tube, and the cold air 17 enters each heat exchange tube through the discharge side air chamber, and indirectly contacts with the high-temperature material in the cooling cylinder in a countercurrent manner. Then, under the action of the transmission device, the cooling cylinder rotates and drives the high-temperature material in the cooling cylinder to exchange heat indirectly with the cold air in the heat exchange tube (the material and the cold air are not in contact). The residence time of the high-temperature material in the cooling cylinder and the flow rate of the cold air are adjusted according to the heat exchange requirements. After the heat exchange is completed, the obtained low-temperature material 15 enters the discharge box through the discharge center tube and is then discharged; the obtained hot air 16 is discharged from the heat exchange tube into the feed side air chamber, and is discharged from the outlet at the top of the feed side air chamber as the combustion-supporting air of the roasting furnace or the carrier gas of the dryer. The entire heat exchange process is efficient, the cooling efficiency is high, the residence time is controllable, and it is easy to cool to the required packaging temperature. In addition, it can also save energy and reduce consumption, reduce the operating costs of the equipment, etc.

[0048] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the protection scope of the present invention.

Claims

1. A device for cooling iron phosphate for lithium batteries, characterized in that: include: A cooling cylinder, wherein at least one heat exchange layer is arranged inside the cooling cylinder along the circumferential direction, and each heat exchange layer comprises a plurality of evenly distributed heat exchange tubes; and a transmission device for rotating the cooling cylinder is arranged outside the cooling cylinder; The end of the feeding center pipe close to the cooling cylinder is flush with the feeding end of the cooling cylinder in the vertical direction or extends into the cooling cylinder by a distance of ≤100mm; The other end of the discharge center pipe close to the cooling cylinder is flush with the discharge end of the cooling cylinder in the vertical direction or extends into the cooling cylinder by a distance of ≤100mm; A support system is respectively arranged at both ends of the cooling cylinder and is rotatably connected to the feed center pipe and the discharge center pipe; The feed center tube and the discharge center tube are coaxially arranged with the cooling cylinder, and the diameters of the feed center tube and the discharge center tube are both smaller than the diameter of the cooling cylinder; Both ends of each heat exchange tube pass through annular end plates and are connected to the feed side air chamber and the discharge side air chamber respectively; and the discharge center tube and the feed center tube are not connected to the heat exchange tube.

2. The device for cooling iron phosphate for lithium batteries according to claim 1, characterized in that: The annular end plate comprises a first annular end plate and a second annular end plate; The first annular end plate is fixedly connected to the feed end of the cooling cylinder and the feed center tube respectively; the second annular end plate is fixedly connected to the discharge end of the cooling cylinder and the discharge center tube respectively; One end of each of the heat exchange tubes passes through the first annular end plate to communicate with the feed-side air chamber, and the other end passes through the second annular end plate to communicate with the discharge-side air chamber.

3. The device for cooling iron phosphate for lithium batteries according to claim 1, characterized in that: The support system includes a sleeve, a bearing and a bearing seat; The shaft sleeves are respectively interference fit or fixedly connected with the feed center tube and the discharge center tube.

4. The device for cooling iron phosphate for lithium batteries according to claim 1, characterized in that: The shapes of the heat exchange tubes in each heat exchange layer are the same or different.

5. The device for cooling iron phosphate for lithium batteries according to claim 4, characterized in that: The shape of the heat exchange tubes in each heat exchange layer is selected from a circle, a polygon or a triangle.

6. The device for cooling iron phosphate for lithium batteries according to claim 4, characterized in that: The heat exchange tubes in each heat exchange layer are all circular in shape and are coaxially arranged.

7. The device for cooling iron phosphate for lithium batteries according to claim 1, characterized in that: The device also includes a feeding mechanism and a discharging mechanism; The feeding mechanism is connected to the cooling cylinder via the feeding center pipe; the cooling cylinder is connected to the discharging mechanism via the discharging center pipe.

8. The device for cooling iron phosphate for lithium batteries according to claim 7, characterized in that: The feeding mechanism is in sealed communication with the feeding center pipe; The discharge center pipe is sealed and connected to the discharge mechanism.

9. The device for cooling iron phosphate for lithium batteries according to claim 8, characterized in that: The feeding mechanism is selected from a chute feeding device, a feeding box or a screw feeding device; The discharging mechanism is selected from a chute discharging device, a discharging box or a spiral discharging device.

10. The device for cooling iron phosphate for lithium batteries according to claim 1, characterized in that: The transmission device adopts gear transmission or friction pair transmission.

Images