Spray dryer for lithium battery positive electrode material

Abstract

The utility model provides a lithium battery anode material spray dryer which comprises an air inlet device, a spraying device, a collecting device, a dust collecting bag cleaning device and an air outlet device, the air inlet device comprises an induced draft fan, a first air supply pipeline, an air heater and a second air supply pipeline, and the induced draft fan is arranged at one end of the first air supply pipeline; the other end of the first air supply pipeline is connected with the upper portion of the spraying device, the air heater is installed on the first air supply pipeline, the bottom of the spraying device is connected with the collecting device through the second air supply pipeline, and the dust collecting bag cleaning device is arranged in the collecting device which is connected with the air outlet device. According to the equipment, dust on the cloth bag is shaken down in a vibration manner, and the dust collection cloth bag can be automatically cleaned by matching with internal and external pulse blowing of the cloth bag. The device is convenient to operate and capable of automatically cleaning the cloth bag of the drying tower, manual cleaning is avoided, time and labor are saved, dust collected by the cloth bag can be effectively removed, and cross contamination of sprayed materials is prevented.

Description

Technical Field

[0001] This utility model belongs to the field of bag dust removal technology for spray dryers, and specifically relates to a spray dryer for lithium battery cathode materials. Background Technology

[0002] A spray dryer works by filtering and heating air before it enters the air distributor at the top of the dryer. The hot air enters the drying chamber in a spiral pattern and is evenly distributed. The liquid feed is atomized into extremely fine droplets by a high-speed centrifugal atomizer or high-pressure atomizer at the top of the tower. These droplets come into contact with the air in a parallel flow and are dried into the finished product in a very short time. The finished product is continuously discharged from the bottom of the dryer and the cyclone separator. Fine dust is collected by a pulse bag filter, and exhaust gas is discharged by a fan. The spray dryer mainly consists of a drying chamber, an induced draft fan, a hot air distributor, a cyclone separator, an airflow regulator, an electrical control system, and a dust removal system. During preheating, the drying chamber and the discharge outlet of the cyclone separator should be kept sealed to prevent cold air from entering the drying chamber and affecting the preheating effect. The current drawback is that the dust collection bags in the spray dryer's dust removal system are difficult to clean, causing cross-contamination of the sprayed materials. Cleaning the bags requires removing them from the dust collection chamber, which is time-consuming, labor-intensive, and prone to scratching and contamination. Therefore, it is necessary to develop a spray dryer for lithium-ion battery cathode materials that can improve the dust collection efficiency of the bags. Utility Model Content

[0003] The purpose of this invention is to provide a spray dryer for lithium battery cathode materials to solve the above-mentioned problems.

[0004] To solve the above-mentioned technical problems, this utility model provides a lithium battery cathode material spray dryer, including: an air inlet device, a spraying device, a collecting device, a dust collector bag cleaning device, and an air outlet device. The air inlet device includes an induced draft fan, a first air supply duct, an air heater, and a second air supply duct. The induced draft fan is disposed at one end of the first air supply duct, and the other end of the first air supply duct is connected to the upper part of the spraying device. The air heater is installed on the first air supply duct. The bottom of the spraying device is connected to the collecting device through the second air supply duct. The dust collector bag cleaning device is disposed in the collecting device, and the collecting device is connected to the air outlet device.

[0005] As a preferred embodiment of the lithium battery cathode material spray dryer of this utility model, the air inlet device further includes an air filter, which is installed on the first air supply duct.

[0006] As a preferred embodiment of the lithium battery cathode material spray dryer described in this utility model, the spray device includes a slurry inlet pipe, a peristaltic pump, a spray nozzle, and a spray drying tower. The peristaltic pump is installed on the slurry inlet pipe, the tail end of the slurry inlet pipe is connected to the spray nozzle, and the spray nozzle is located at the top of the spray drying tower.

[0007] As a preferred embodiment of the lithium battery cathode material spray dryer of this utility model, the collection device includes a collection chamber, multiple cloth bags, multiple steel mesh cylinders, a receiving hopper, a first spray pipe, a second spray pipe, a clean air chamber, and a spraying device. The clean air chamber is located above the collection chamber. The first and second spray pipes are both placed horizontally. One end of the first spray pipe is connected to the spraying device, and the other end is connected to one end of the second spray pipe. The other end of the second spray pipe is connected to the clean air chamber. The bottom end of the second spray pipe is provided with multiple air outlets, each air outlet is aligned with a cloth bag, and each cloth bag corresponds to a steel mesh cylinder. The cloth bags are covered outside the steel mesh cylinders. The multiple steel mesh cylinders are fixed in the collection chamber. The bottom of the collection chamber is provided with a discharge port, and the discharge port is connected to the receiving hopper.

[0008] As a preferred embodiment of the lithium battery cathode material spray dryer of this utility model, the collecting device further includes multiple pulse blowing pipes, pulse nozzles and pulse ports. The upper end of each pulse blowing pipe is connected to an air outlet, and the lower end of each pulse blowing pipe is provided with a pulse nozzle and a pulse port. The pulse port is located inside the pulse nozzle. The pulse blowing pipe is sleeved on the outside of the top of the cloth bag, and the pulse port is inserted into the inside of the top of the cloth bag.

[0009] As a preferred embodiment of the lithium battery cathode material spray dryer described in this utility model, the collecting device further includes an air hammer, which is disposed above the discharge port.

[0010] As a preferred embodiment of the lithium battery cathode material spray dryer of this utility model, the dust collector bag cleaning device includes a vibration motor, a transmission shaft and a vibration steel wire. The output end of the vibration motor extends outward and is connected to one end of the transmission shaft. The center outer side of the transmission shaft is covered with a first high-temperature rubber column, which is embedded in the side wall of the collection chamber. The other end of the transmission shaft is connected to the vibration steel wire, and part of the vibration steel wire is wound around the steel mesh cylinder.

[0011] As a preferred embodiment of the lithium battery cathode material spray dryer of this utility model, the dust removal bag cleaning device further includes a second high-temperature rubber column, which is installed on the side wall of the collection chamber and covers the first high-temperature rubber column.

[0012] As a preferred embodiment of the lithium battery cathode material spray dryer of this utility model, the air outlet device includes an exhaust fan and a first exhaust pipe. One end of the clean air chamber is provided with a first air inlet, which is far away from the spraying device. The first exhaust pipe is connected to the first air inlet, and the exhaust fan is installed on the first exhaust pipe.

[0013] As a preferred embodiment of the lithium battery cathode material spray dryer of this utility model, the air outlet device further includes a concentration detection device and a concentration controller, which are installed on the first exhaust pipe.

[0014] Compared with the prior art, the lithium battery cathode material spray dryer proposed in this utility model has the following advantages:

[0015] 1. Install a vibration device on the wall of the collection chamber of the spray dryer to shake all the filter bags. The dust particles on the bags are shaken off by vibration and pulse blowing, making them easier to collect.

[0016] 2. This equipment is not only easy to operate, but also can automatically clean the dust collector bags of the spray dryer, avoiding cross-contamination of the sprayed material and manual cleaning, saving time and effort. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a spray dryer for lithium battery cathode materials according to the present invention;

[0019] Figure 2 This is a partial structural schematic diagram of a dust collector bag cleaning device for a lithium battery cathode material spray dryer according to the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the vibration shaft of a spray dryer for lithium battery cathode materials according to the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the vibration shaft and the second high-temperature rubber column of a spray dryer for lithium battery cathode materials according to this utility model.

[0022] Figure 5 This is a schematic diagram of the pulse blowpipe, pulse nozzle, and pulse port of a lithium battery cathode material spray dryer according to the present invention.

[0023] Figure 6 This is a top view schematic diagram of the pulse blowpipe, pulse nozzle, and pulse port of a lithium battery cathode material spray dryer according to the present invention.

[0024] Figure 7 This is a schematic diagram of the installation structure of a dust collector bag cleaning device for a lithium battery cathode material spray dryer according to the present invention.

[0025] Among them, 1 is the induced draft fan, 2 is the first air supply duct, 3 is the air heater, 4 is the second air supply duct, 5 is the air filter, 6 is the slurry inlet pipe, 7 is the peristaltic pump, 8 is the spray nozzle, 9 is the spray drying tower, 10 is the collection chamber, 11 is the filter bag, 12 is the discharge port, 13 is the first spray pipe, 14 is the second spray pipe, 15 is the clean air chamber, 16 is the spray device, 17 is the air outlet, 18 is the receiving hopper, 19 is the pulse blow pipe, 20 is the pulse nozzle, 21 is the pulse port, 22 is the air hammer, 23 is the vibration motor, 24 is the vibration shaft, 25 is the vibrating steel wire, 26 is the first high-temperature rubber column, 27 is the second high-temperature rubber column, 28 is the exhaust fan, 29 is the first exhaust pipe, 30 is the first air inlet and outlet, 31 is the concentration detection device, and 32 is the concentration controller. Detailed Implementation

[0026] This utility model provides a spray dryer for lithium battery cathode materials, which mainly includes: an air inlet device (not shown), a spray device (not shown), a collection device (not shown), a dust collector bag cleaning device (not shown), and an air outlet device (not shown).

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the present utility model will be further described in detail below with reference to specific embodiments.

[0028] First, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0029] Secondly, this utility model is described in detail using structural diagrams, etc. When detailing the embodiments of this utility model, for ease of explanation, the schematic diagrams illustrating the structure of a lithium battery cathode material spray dryer may be partially enlarged, not according to general proportions. Furthermore, these schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include three-dimensional space with length, width, and depth.

[0030] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of a spray dryer for lithium battery cathode materials according to this utility model. Figure 1 As shown, a lithium battery cathode material spray dryer includes: an induced draft fan 1, an air heater 3, and an air filter 5, all mounted on a first air supply duct 2, which leads to a spray drying tower 9. A peristaltic pump 7 is installed on a slurry inlet pipe 6, the tail end of which is connected to a spray nozzle 8, which is located at the top of the spray drying tower 9. The outlet of the spray drying tower 9 is connected to a collection chamber 10 via a second air supply duct 4. A clean air chamber 15 is located above the collection chamber 10. A first spray pipe 13 and a second spray pipe 14 are both horizontally placed. One end of the first spray pipe 13 is connected to a spraying device 16, and the other end is connected to one end of the second spray pipe 14. The other end of the second spray pipe 14 is connected to the clean air chamber 15. The bottom end of the second spray pipe 14 is provided with multiple air outlets 17, each air outlet 17 being aligned with a cloth bag 11.

[0031] Please continue reading. Figure 1 and combined Figures 5 to 6 , Figure 5 This is a schematic diagram of the pulse blowpipe, pulse nozzle, and pulse port of a lithium battery cathode material spray dryer according to the present invention. Figure 6 This is a top view schematic diagram of the pulse blowpipe, pulse nozzle, and pulse orifice of a spray dryer for lithium battery cathode materials according to this utility model. Figure 1 , 5 As shown in Figure 6, the pulse blowpipe 19 is installed below the air outlet 17 and is connected to the air outlet 17. In order to clean the dust collection more thoroughly, the pulse air blows downward from the top of the filter bag 11, so that the entire filter bag 11 can be blown. If the air is blown horizontally from the filter bag 11, more nozzles would be needed. The pulse blowpipe 19 is made into a cylindrical ring structure, and the pulse nozzle 20 is also circular. The lower end of the pulse blowpipe 19 is provided with a pulse nozzle 20 and a pulse port 21. The pulse port 21 is located inside the pulse nozzle 20. The original pulse blowing from the inside of the filter bag 11 to the outside of the filter bag is changed to pulse blowing from both inside and outside of the filter bag at the same time. That is, the pulse port 21 is set inside and the pulse nozzle 20 is set outside. The pulse port 21 and the pulse nozzle 20 first blow the gas downward to clean it, and then the pulse port 21 draws air upward to increase the pressure inside the collection chamber 10. A pulse blowing pipe 19 is fitted onto the outside of the top of the cloth bag 11, and a pulse port 21 is inserted into the inside of the top of the cloth bag 11. Each cloth bag 11 corresponds to a steel mesh cylinder (not shown). The cloth bag 11 covers the steel mesh cylinder, and multiple steel mesh cylinders are fixed in the collection chamber 10. The bottom of the collection chamber 10 is provided with a discharge port 18. An air hammer 22 is set above the receiving hopper 18, which is connected to the discharge port 12. One end of the clean air chamber 15 is provided with a first air inlet 30, which is away from the blowing device 16. A first exhaust pipe 28 is connected to the first air inlet 30. An exhaust fan 28, a concentration detection device 31, and a concentration controller 32 are set on the first exhaust pipe 29.

[0032] Please continue reading. Figure 1 and combined Figures 2 to 4 , Figure 2 This is a partial structural schematic diagram of a dust collector bag cleaning device for a lithium battery cathode material spray dryer according to the present invention. Figure 3 This is a schematic diagram of the structure of the vibration shaft of a spray dryer for lithium battery cathode materials according to the present invention; Figure 4 This is a schematic diagram of the vibration shaft and the second high-temperature rubber column of a spray dryer for lithium battery cathode materials according to this utility model. Figure 1 , 2 As shown in Figure 4, the dust collector bag cleaning device includes a vibration motor 23, a transmission shaft 24, and a vibration steel wire 25. The vibration motor 23 can be installed on the dust collector mounting frame of the spray dryer. The output end of the vibration motor 23 extends outward and is connected to one end of the transmission shaft 24. The center of the transmission shaft 24 is covered with a first high-temperature rubber column 26, which is embedded in the side wall of the collection chamber. A second high-temperature rubber column 27 is installed on the side wall of the collection chamber 10, and the second high-temperature rubber column 27 covers the first high-temperature rubber column 26. Through the arrangement of the above two layers of rubber columns, the airtightness of the collection chamber 10 is improved.

[0033] Please continue reading. Figure 1 and combined Figure 7 , Figure 7 This is a schematic diagram of the installation structure of a dust collector bag cleaning device for a lithium battery cathode material spray dryer according to this utility model. Figure 1 and Figure 7 As shown, the other end of the transmission shaft 24 is connected to the vibrating steel wire 25. Part of the vibrating steel wire 25 is wound around the steel mesh cylinder. The vibrating steel wire 25 connects multiple transmission shafts 24 and steel mesh cylinders fitted with high-temperature rubber columns. For greater strength, stainless steel wires can be added between the vibrating steel wires 25 to form a steel wire loop array. The cloth bag 11 is covered outside the steel mesh cylinder, which is equivalent to being located in this steel wire loop array. The vibration motor 23 drives the transmission shaft 24 and the vibrating steel wire 25 to vibrate, causing the steel mesh cylinder to drive the cloth bag 11 to vibrate. While vibrating, pulse air is blown, and the air is blown in the form of pulses from the top of the cloth bag 11 downwards. Through the combination of vibration and pulse, the automatic cleaning of the cloth bag 11 is completed.

[0034] The working process of the above-mentioned spray dryer is as follows:

[0035] 1. Before spraying, turn on the dust collector bag cleaning device and clean the dust collected on the bag 11.

[0036] 2. During gas heating, air is sent to the first air supply duct 2 by the induced draft fan 1, heated by the air heater 3, filtered by the air filter 5, and then to the spray drying tower 9. It then enters the collection chamber 10 through the second air supply duct 4. The gas in the collection chamber 10 first passes through the filter bag 11 for dust removal. The pulse blowing device 16 blows the dust particles on the filter bag 11 down into the discharge port 12. After dust removal, the clean gas re-enters the clean air chamber 15, passes through the first air inlet 30, and then passes through the exhaust fan 28 and the first exhaust pipe 29 to the concentration detection device 31. After detection, the gas is exhausted through the concentration controller 32.

[0037] 3. During spraying, spraying begins once the temperature of the spray drying tower 9 reaches the required level. The liquid material is pumped from the peristaltic pump 7 through the feed pipe 6 to the spray nozzle 8. The liquid material is then atomized into extremely fine droplets by the high-speed centrifugal atomizing nozzle or high-pressure atomizing nozzle at the top of the tower. These droplets come into contact with the air and dry into the finished product in a very short time. The finished product, after contact with hot air, enters the collection chamber 10 through the second air supply pipe. The finished product is then sent from the discharge port 12 to the receiving hopper 18. The air hammer 22 then hammers the finished product off the inclined side of the discharge port 12, preventing it from adhering to the side wall. Some sprayed material may stick to the cloth bag 11. The vibrating motor 23 drives the vibrating steel wire 25 to vibrate, causing the steel mesh cylinder to move the cloth bag 11, shaking off the sprayed material. Internal and external pulse air blowing is performed from above the cloth bag 11, blowing the fine sprayed material off the bag 11.

[0038] Therefore, the lithium battery cathode material spray dryer described in this utility model uses vibration to shake off the dust collected on the filter bags, and then combines this with pulse air blowing inside and outside the filter bags to automatically clean the dust collection bags. This equipment is not only easy to operate, but also can automatically clean the filter bags of the drying tower, avoiding manual cleaning, saving time and labor, effectively removing dust collected on the filter bags, and preventing cross-contamination of the sprayed materials.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A spray dryer for lithium battery cathode materials, characterized in that, include: The system includes an air inlet device, a spraying device, a collection device, a dust collector bag cleaning device, and an air outlet device. The air inlet device includes an induced draft fan, a first air supply duct, an air heater, and a second air supply duct. The induced draft fan is located at one end of the first air supply duct, and the other end of the first air supply duct is connected to the upper part of the spraying device. The air heater is installed on the first air supply duct. The bottom of the spraying device is connected to the collection device through the second air supply duct. The dust collector bag cleaning device is located in the collection device, and the collection device is connected to the air outlet device.

2. The spray dryer for lithium battery cathode materials as described in claim 1, characterized in that: The air intake device also includes an air filter, which is installed on the first air supply duct.

3. The spray dryer for lithium battery cathode materials as described in claim 1, characterized in that: The spraying device includes a slurry inlet pipe, a peristaltic pump, a spray nozzle, and a spray drying tower. The peristaltic pump is installed on the slurry inlet pipe, and the tail end of the slurry inlet pipe is connected to the spray nozzle. The spray nozzle is located at the top of the spray drying tower.

4. The spray dryer for lithium battery cathode materials as described in claim 1, characterized in that: The collection device includes a collection chamber, multiple cloth bags, multiple steel mesh cylinders, a receiving hopper, a first blowing pipe, a second blowing pipe, a clean air chamber, and a blowing device. The clean air chamber is located above the collection chamber. The first and second blowing pipes are both placed horizontally. One end of the first blowing pipe is connected to the blowing device, and the other end is connected to one end of the second blowing pipe. The other end of the second blowing pipe is connected to the clean air chamber. The bottom end of the second blowing pipe is provided with multiple air outlets, each air outlet is aligned with a cloth bag, and each cloth bag corresponds to a steel mesh cylinder. The cloth bags are covered outside the steel mesh cylinders. The multiple steel mesh cylinders are fixed in the collection chamber. The bottom of the collection chamber is provided with a discharge port, which is connected to the receiving hopper.

5. A spray dryer for lithium battery cathode materials as described in claim 4, characterized in that: The collecting device also includes multiple pulse blowing pipes, pulse nozzles, and pulse ports. The upper end of each pulse blowing pipe is connected to an air outlet, and the lower end of each pulse blowing pipe is provided with a pulse nozzle and a pulse port. The pulse port is located inside the pulse nozzle. The pulse blowing pipe is sleeved on the outside of the top of the cloth bag, and the pulse port is inserted into the inside of the top of the cloth bag.

6. The spray dryer for lithium battery cathode materials as described in claim 4, characterized in that: The collecting device also includes an air hammer, which is positioned above the discharge port.

7. A spray dryer for lithium battery cathode materials as described in claim 4, characterized in that: The dust collector bag cleaning device includes a vibration motor, a transmission shaft, and a vibration steel wire. The output end of the vibration motor extends outward and is connected to one end of the transmission shaft. A first high-temperature rubber column is wrapped around the center of the transmission shaft. The first high-temperature rubber column is embedded in the side wall of the collection chamber. The other end of the transmission shaft is connected to the vibration steel wire, and part of the vibration steel wire is wound around the steel mesh cylinder.

8. A spray dryer for lithium battery cathode materials as described in claim 7, characterized in that: The dust collector bag cleaning device also includes a second high-temperature rubber column, which is installed on the side wall of the collection chamber and covers the first high-temperature rubber column.

9. A spray dryer for lithium battery cathode materials as described in claim 4, characterized in that: The air outlet device includes an exhaust fan and a first exhaust pipe. One end of the clean air chamber is provided with a first air inlet, which is far away from the blowing device. The first exhaust pipe is connected to the first air inlet, and the exhaust fan is installed on the first exhaust pipe.

10. A spray dryer for lithium battery cathode materials as described in claim 9, characterized in that: The air outlet device also includes a concentration detection device and a concentration controller, which are installed on the first exhaust duct.

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