Spray drying tower for producing lithium iron phosphate

Abstract

The embodiment of the utility model discloses a spray drying tower for producing lithium iron phosphate, which comprises an air distributor, a rotary atomizer, a main air inlet pipe, a tower body and an exhaust pipe, the air distributor is mounted at the top of the tower body, the main air inlet pipe is mounted on the side surface of the air distributor, and the tower body comprises an upper tower body and a lower tower body. A supporting seat ring is installed on the outer side of the joint of the upper tower body and the lower tower body, an exhaust pipe is installed at the bottom of the lower tower body, the rotary atomizer penetrates through the middle of the air distributor, the top of the rotary atomizer is located at the upper end of the air distributor, and the rotary atomizer is located at the lower end of the bottom of the air distributor. Powder is effectively prevented from being retained in the exhaust pipe; by arranging the two air pipes, a pipe wall protection air layer can be formed, adhesion and hanging in the air pipes are avoided, and the device is suitable for high-viscosity powder.

Description

Technical Field

[0001] The utility model relates to the technical field of drying, in particular to a spray drying tower for producing lithium iron phosphate. Background Art

[0002] Batteries are increasingly used in modern life, with lithium batteries gaining popularity due to their high energy density, long lifespan, and environmental friendliness. Lithium iron phosphate batteries, a new type of lithium battery, are widely used in energy storage, electric vehicles, and green energy. However, as a composite material, lithium iron phosphate (LIP) requires a complex preparation process, with drying, in particular, having a crucial impact on material quality. Therefore, spray drying of LFP has become the most common drying method.

[0003] The lithium iron phosphate spray drying tower has a fast drying speed. The surface area of ​​the liquid material is greatly increased after atomization. In the hot air flow, 95%-98% of the water can be evaporated instantly. The drying time is only a few seconds. It is particularly suitable for drying heat-sensitive materials.

[0004] To obtain a high energy density battery, the lithium iron phosphate material needs to have a high stacking density, so the lithium iron phosphate material needs to have an extremely small particle size, and generally requires the spray-dried product D50 to be less than 20um.

[0005] The main characteristics of the traditional use of upper exhaust are that the product has a larger particle size and a smaller bulk density, but a smaller risk of thermal denaturation. Upper exhaust is mostly suitable for processes with agglomeration functions, but not for the production of lithium iron phosphate. Utility Model Content

[0006] The utility model provides a spray drying tower for producing lithium iron phosphate, which dries a material solution to make the product particle size smaller, obtain a higher bulk density, and reduce the risk of thermal denaturation.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A spray drying tower for producing lithium iron phosphate comprises an air distributor, a rotary atomizer, a main air inlet pipe, a tower body and an exhaust pipe. The air distributor is mounted on the top of the tower body, the main air inlet pipe is mounted on the side of the air distributor, the tower body comprises an upper tower body and a lower tower body, a support seat ring is mounted on the outside of the connection between the upper tower body and the lower tower body, the exhaust pipe is mounted on the bottom of the lower tower body, the rotary atomizer passes through the middle of the air distributor, the top of the rotary atomizer is located at the upper end of the air distributor, and the rotary atomizer is located at the lower end of the bottom of the air distributor.

[0009] Preferably, the upper tower body includes an upper inner tower body and an upper outer tower body, the lower tower body includes a lower inner tower body and a lower outer tower body, thermal insulation rock wool is provided between the upper inner tower body and the upper outer tower body, and thermal insulation rock wool is provided between the lower inner tower body and the lower outer tower body. The bottom of the air distributor is installed in the middle of the top of the upper inner tower body, and the rotary atomizer is installed at the top center of the upper outer tower body.

[0010] Preferably, the air distributor includes an air inlet ring, an air outlet ring, a connecting ring and multiple air guide plates, the main air inlet pipe is connected to the air inlet ring, the connecting ring connects the air inlet ring and the air outlet ring, multiple air guide plates are installed on the connecting ring, the diameter of the air outlet ring is smaller than the diameter of the air inlet ring, and the lower end of the connecting ring is provided with several circumferentially distributed mounting plates, and the bottom of the mounting plate is installed on the top of the upper inner tower body.

[0011] Preferably, an air inlet cover plate is provided on the top of the air inlet ring, and the air inlet cover plate is a ring plate. A vertical sealing plate is installed on the upper end of the air inlet cover plate, and a fixed ring plate is installed on the sealing plate. The fixed ring plate is installed on the top plate on the top of the upper outer tower body. The inner side of the fixed ring plate is provided with a baffle mounting plate and a mounting ring plate pointing vertically downward. A conical baffle is installed on the lower end of the baffle mounting plate. The baffle passes through the air outlet ring, and a rotary atomizer mounting plate is installed on the bottom of the mounting ring plate. The rotary atomizer is installed in the middle of the rotary atomizer mounting plate. The bottom of the rotary atomizer passes through the baffle. The baffle and the bottom of the rotary atomizer are both located in the upper inner tower body.

[0012] Preferably, a conical sealing plate is installed between the air outlet ring and the opening of the upper inner tower body, and two air ducts pass through the conical sealing plate. One end of the air duct is located between the conical sealing plate and the air outlet ring, and the other end of the two air ducts passes through the top plate on the top of the upper outer tower body.

[0013] Preferably, a cyclone separator is installed at the end of the exhaust pipe.

[0014] Preferably, the exhaust pipe is a curved pipe with a bending angle of 60 degrees, and a sewage outlet is installed at the lower end of the exhaust pipe.

[0015] Preferably, both the upper tower body and the lower tower body are equipped with air hammers, the lower tower body is equipped with a manhole, and the upper tower body is equipped with a tower door and a sight glass.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model improves the exhaust mechanism of the drying tower, and the exhaust pipe is located at the bottom, which effectively avoids powder retention in the exhaust pipe; by arranging two air pipes, a protective wind layer can be formed on the pipe wall to avoid sticking in the air pipe, which is suitable for high-viscosity powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of an embodiment of the present utility model.

[0019] Figure 2 It is a partial schematic diagram of an embodiment of the present utility model.

[0020] Figure 3 It is a schematic diagram of the partial internal structure of an embodiment of the present utility model.

[0021] Figure 4 yes Figure 3 A partial schematic diagram of .

[0022] Figure 5 This is a schematic diagram of an air distributor according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of an air distributor according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the combined installation of an air distributor and a rotary atomizer according to one embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the combined installation of an air distributor and a rotary atomizer according to one embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] As shown in the figure, the utility model discloses a spray drying tower for producing lithium iron phosphate, comprising an air distributor 1, a rotary atomizer 2, a main air inlet pipe 3, a tower body 4, and an exhaust pipe 5. The air distributor 1 is mounted on the top of the tower body 4, the main air inlet pipe 3 is mounted on the side of the air distributor 1, the tower body 4 comprises an upper tower body 6 and a lower tower body 7, a support seat ring 8 is mounted on the outside of the connection between the upper tower body 6 and the lower tower body 7, the exhaust pipe 5 is mounted on the bottom of the lower tower body 7, the rotary atomizer 2 passes through the middle of the air distributor 1, the top of the rotary atomizer 2 is located at the upper end of the air distributor 1, and the rotary atomizer 2 is located at the lower end of the bottom of the air distributor 1. The exhaust pipe 5 is located at the bottom, effectively preventing powder from being retained in the exhaust pipe. The main air inlet pipe 3 is used to supply hot air.

[0028] After being filtered and heated, air enters the main air inlet pipe 3 and enters the air distributor 1 at the top of the dryer. The hot air enters the air distributor 1 in a spiral pattern and is evenly distributed. The liquid feed passes through a peristaltic pump and filter, and is then delivered to the rotary atomizer 2 at the top of the drying tower. The rotary atomizer 2 rotates at high speed, spraying the liquid feed into extremely fine mist droplets. The liquid feed and the hot air come into contact with each other in parallel, rapidly evaporating the water and drying the finished product in a very short time. The finished product is continuously discharged from the bottom of the drying tower. To ensure product purity, the entire drying process is designed to minimize contact with metal materials and keep the process simple.

[0029] In one embodiment of the present invention, the upper tower body 6 includes an upper inner tower body 61 and an upper outer tower body 62, and the lower tower body 7 includes a lower inner tower body 71 and a lower outer tower body 72. Insulation rock wool 9 is provided between the upper inner tower body 61 and the upper outer tower body 62, and insulation rock wool 9 is provided between the lower inner tower body 71 and the lower outer tower body 72. The bottom of the air distributor 1 is installed in the middle of the top of the upper inner tower body 61, and the rotary atomizer 2 is installed in the center of the top of the upper outer tower body 62. The upper tower body 6 and the lower tower body 7 are a double-layer structure, which plays a role in insulation, maintains the temperature inside the tower body, and ensures the drying effect.

[0030] In one embodiment of the present invention, the air distributor 1 includes an air inlet ring 10, an air outlet ring 11, a connecting ring 12, and a plurality of air guide plates 13. The main air inlet duct 3 is connected to the air inlet ring 10, and the connecting ring 12 connects the air inlet ring 10 and the air outlet ring 11. The plurality of air guide plates 13 are mounted on the connecting ring 12. Of course, the other end of the air guide plate 13 is mounted on the air outlet ring 11. The diameter of the air outlet ring 11 is smaller than that of the air inlet ring 10. The lower end of the connecting ring 12 is provided with a plurality of circumferentially distributed mounting plates 14. The bottom of the mounting plates 14 is mounted on the top of the upper inner tower body 61. The length of the air guide plates 13 gradually changes to achieve spiral air inlet.

[0031] In one embodiment of the present invention, an air inlet cover plate 15 is provided at the top of the air inlet ring 10. The air inlet cover plate 15 is an annular plate. A vertical sealing plate 16 is installed at the upper end of the air inlet cover plate 15. A fixing ring plate 17 is installed on the sealing plate 16. The fixing ring plate 17 is installed on the top plate 621 at the top of the upper outer tower body 62. The inner side of the fixing ring plate 17 is provided with a baffle mounting plate 18 and a mounting ring plate 19 extending vertically downward. A conical baffle 20 is installed at the lower end of the baffle mounting plate 18. The baffle 20 passes through the air outlet ring 11. A rotary atomizer mounting plate 21 is installed at the bottom of the mounting ring plate 19. The rotary atomizer 2 is installed in the middle of the rotary atomizer mounting plate 21. The bottom of the rotary atomizer 2 passes through the baffle 20. The baffle 20 and the bottom of the rotary atomizer 2 are both located within the upper inner tower body 61. The air inlet cover plate 15 is used for sealing to prevent airflow from flowing out from the upper end. The hot air flow from the air distributor 1 is discharged from the lower end between the baffle 20 and the air inlet ring 10, contacts the feed liquid and heats and dries the feed liquid.

[0032] In one embodiment of the present invention, a conical sealing plate 22 is installed between the air outlet ring 11 and the opening of the upper inner tower body 61. Two air ducts 23 pass through the conical sealing plate 22. One end of the air duct 23 is located between the conical sealing plate 22 and the air outlet ring 11, and the other end of the two air ducts 23 passes through the top plate 621 at the top of the upper outer tower body. The air ducts 23 are designed to form a protective air layer on the pipe wall to prevent the dried powdered product from sticking to the air duct.

[0033] In one embodiment of the present invention, a cyclone separator 24 is installed at the end of the exhaust pipe 5. Powder and hot air enter the cyclone separator 24, the powder is collected by the pollination cylinder located at the lower end of the cyclone separator 24, and the exhaust gas is filtered by the bag filter and then exhausted by the exhaust fan.

[0034] In one embodiment of the present invention, the exhaust pipe 5 is a curved pipe with a curvature angle of 60 degrees. A drain outlet 25 is installed at the bottom of the exhaust pipe 5 to prevent water from accumulating at the elbow during tower cleaning.

[0035] In one embodiment of the present invention, both the upper tower body 6 and the lower tower body 7 are equipped with an air hammer 26. The lower tower body is equipped with a manhole 27, which facilitates cleaning of the tower cone. The upper tower body is equipped with a tower door 28 and a sight glass 29. The tower door 28 facilitates maintenance and cleaning of the drying tower. The sight glass 29 allows for a clear view of the atomization of the liquid inside the drying tower during production. A pressure sensor is installed near the tower door 28 to monitor the pressure within the drying tower.

[0036] The above content is merely an example and explanation of the structure of the present invention. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A spray drying tower for producing lithium iron phosphate, characterized in that: It includes an air distributor, a rotary atomizer, a main air inlet pipe, a tower body and an exhaust pipe. The air distributor is installed on the top of the tower body, the main air inlet pipe is installed on the side of the air distributor, the tower body includes an upper tower body and a lower tower body, a support seat ring is installed on the outside of the connection between the upper tower body and the lower tower body, an exhaust pipe is installed at the bottom of the lower tower body, the rotary atomizer passes through the middle of the air distributor, the top of the rotary atomizer is located at the upper end of the air distributor, and the rotary atomizer is located at the lower end of the bottom of the air distributor.

2. A spray drying tower for producing lithium iron phosphate according to claim 1, characterized in that: The upper tower body includes an upper inner tower body and an upper outer tower body, and the lower tower body includes a lower inner tower body and a lower outer tower body. Insulation rock wool is provided between the upper inner tower body and the upper outer tower body, and insulation rock wool is provided between the lower inner tower body and the lower outer tower body. The bottom of the air distributor is installed in the middle of the top of the upper inner tower body, and the rotary atomizer is installed at the center of the top of the upper outer tower body.

3. A spray drying tower for producing lithium iron phosphate according to claim 2, characterized in that: The air distributor includes an air inlet ring, an air outlet ring, a connecting ring and multiple air guide plates. The main air inlet pipe is connected to the air inlet ring. The connecting ring connects the air inlet ring and the air outlet ring. Multiple air guide plates are installed on the connecting ring. The diameter of the air outlet ring is smaller than the diameter of the air inlet ring. The lower end of the connecting ring is provided with several circumferentially distributed mounting plates. The bottom of the mounting plate is installed on the top of the upper inner tower body.

4. A spray drying tower for producing lithium iron phosphate according to claim 3, characterized in that: An air inlet cover is provided on the top of the air inlet ring. The air inlet cover is a ring-shaped plate. A vertical sealing plate is installed on the upper end of the air inlet cover. A fixed ring plate is installed on the sealing plate. The fixed ring plate is installed on the top plate on the top of the upper outer tower body. A baffle mounting plate and a mounting ring plate are provided on the inner side of the fixed ring plate. A conical baffle is installed on the lower end of the baffle mounting plate. The baffle passes through the air outlet ring. A rotary atomizer mounting plate is installed on the bottom of the mounting ring plate. The rotary atomizer is installed in the middle of the rotary atomizer mounting plate. The bottom of the rotary atomizer passes through the baffle. The baffle and the bottom of the rotary atomizer are both located in the upper inner tower body.

5. A spray drying tower for producing lithium iron phosphate according to claim 4, characterized in that: A conical sealing plate is installed between the air outlet ring and the opening of the upper inner tower body. Two air ducts pass through the conical sealing plate. One end of the air duct is located between the conical sealing plate and the air outlet ring, and the other end of the two air ducts passes through the top plate on the top of the upper outer tower body.

6. The spray drying tower for producing lithium iron phosphate according to claim 1, characterized in that: A cyclone separator is installed at the end of the exhaust pipe.

7. A spray drying tower for producing lithium iron phosphate according to claim 6, characterized in that: The exhaust duct is a curved pipe with a bending angle of 60 degrees, and a sewage outlet is installed at the bottom of the exhaust duct.

8. The spray drying tower for producing lithium iron phosphate according to claim 1, characterized in that: Both the upper tower body and the lower tower body are equipped with air hammers, the lower tower body is equipped with a manhole, and the upper tower body is equipped with a tower door and a sight glass.

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