Cobalt hydroxide steam rotary drying device

Abstract

The utility model discloses a cobalt hydroxide steam rotary drying device which comprises a barrel, the front end of the barrel is connected with a feeding screw, a radial striker plate, an axial striker plate and an overflow plate are arranged at the front end in the barrel, and a dry and wet material mixing area is formed among the radial striker plate, the axial striker plate and the overflow plate; an ellipsoidal steam pipe is arranged in the cylinder body, and high-temperature steam is introduced into the ellipsoidal steam pipe to dry materials entering the cylinder body; high-temperature steam is used as a heat source for indirect heating, and condensate water is formed after heat exchange between the steam and materials and can be temporarily stored in the ellipsoidal steam pipe, so that the utilization rate of heat energy is improved; meanwhile, through the arrangement of the dry and wet material mixing area, the material viscosity can be reduced, and pipe adhesion and wall adhesion are avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of cobalt hydroxide drying equipment, specifically relating to a cobalt hydroxide steam rotary drying equipment. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] With the rapid development of technology, the demand for high-performance lithium-ion batteries is increasing. Cathode materials are a crucial component of lithium-ion batteries. Cobalt hydroxide, as a basic raw material and intermediate in the production of cathode materials, not only enhances battery stability but also helps improve battery life and performance, thus its demand in the battery field is steadily growing. Simultaneously, as an important catalyst and raw material for magnetic materials, glass, and ceramics, cobalt hydroxide also enjoys strong market demand. Fine cobalt hydroxide powder is light blue-green, turning rose-colored when it transforms into a hexagonal crystal system; its color is related to particle size.

[0004] Currently, flash drying is the most common process for producing cobalt hydroxide. Air is heated to the required temperature by a heater, and the cobalt hydroxide is fed into the main tower by a screw feeder. Under the impact of a high-speed rotating dispersing mechanism and high-temperature airflow, the cobalt hydroxide is pulverized and entrained by the airflow, causing the moisture in the material to evaporate rapidly, thus completing the drying process. Because the flash dryer used for cobalt hydroxide drying evaporates the moisture from the material under high-temperature conditions, a large amount of high-temperature hot air is needed to exchange heat with the material and carry it to a dust removal device for collection. In actual production, to obtain a qualified dried product, the system's inlet air needs to be heated to a high temperature, resulting in a significantly higher temperature in the system's exhaust gas. The high-temperature hot air acts as a heat exchange medium and transports the material, leading to high energy consumption and low energy utilization in the drying system. Furthermore, due to limitations in equipment processing capacity, increased equipment investment is required to improve output. Larger equipment sizes and higher-speed material movement within the dryer cause more severe wear and tear on the equipment, reducing its lifespan. Utility Model Content

[0005] The purpose of this invention is to provide a cobalt hydroxide steam rotary drying device that uses high-temperature steam as a heat source for indirect heating. After the steam exchanges heat with the material, condensate is formed and can be temporarily stored in an ellipsoidal steam pipe, thereby improving the utilization rate of thermal energy. At the same time, the dry and wet material mixing zone can reduce the viscosity of the material and prevent it from sticking to the pipe and wall.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] In a first aspect, embodiments of this utility model provide a cobalt hydroxide steam rotary dryer, comprising a cylinder, the front end of which is connected to a feeding screw, and a radial baffle, an axial baffle, and an overflow plate are provided at the front end of the cylinder interior, forming a dry-wet material mixing zone between the radial baffle, the axial baffle, and the overflow plate; an ellipsoidal steam pipe is provided inside the cylinder, and high-temperature steam is introduced into the ellipsoidal steam pipe to dry the material entering the cylinder.

[0008] As a further technical solution, the ellipsoidal steam pipe is arranged in multiple layers from the inside to the outside. The multiple ellipsoidal steam pipes in each layer are arranged in a ring and uniformly. The ellipsoidal steam pipes in adjacent layers are connected through the condensate outflow channel. The innermost ellipsoidal steam pipe is connected to the condensate outflow pipe as a condensate pipe, and the ellipsoidal steam pipes in the remaining layers are connected to the steam inlet main pipe.

[0009] As a further technical solution, the end of the ellipsoidal steam pipe near the rear end of the cylinder is fixed by an end plate. The end plate seals the ends of the condensate outlet pipe and the steam inlet main pipe located inside the cylinder. The ends of the condensate outlet pipe and the steam inlet main pipe located outside the cylinder are connected to the condensate pipe and the steam pipe by a high-temperature rotary joint.

[0010] As a further technical solution, one end of the radial baffle is fixed to the inner wall surface of the front end of the cylinder, and the other end is connected to the axial baffle, with the feeding screw extending into the axial baffle.

[0011] As a further technical solution, an inner thread is provided on the inner wall surface of the axial baffle plate, and an outer thread is provided on the outer wall surface of the axial baffle plate.

[0012] As a further technical solution, multiple arc-shaped turning plates are provided on the inner wall surface of the radial baffle plate at the material contact end.

[0013] As a further technical solution, the overflow plate is fixed to the inner wall of the cylinder, and the overflow plate is provided with multiple round holes to allow the ellipsoidal steam pipe to pass through. Multiple straight-flipping plates are provided on the end face of the overflow plate facing the front end of the cylinder.

[0014] As a further technical solution, a feed hood is provided at the front end of the cylinder, a humid gas outlet is provided above the feed hood, a discharge hood is provided at the rear end of the cylinder, and a humid gas inlet is provided above the discharge hood.

[0015] As a further technical solution, the outer wall surface of the cylinder is connected to the transmission device through a gear ring, and the transmission device drives the cylinder to rotate.

[0016] As a further technical solution, the feeding screw is connected to the feeding bin, which stores wet materials to be dried.

[0017] The beneficial effects of the above-described embodiments of this utility model are as follows:

[0018] (1) The cobalt hydroxide steam rotary dryer provided by this utility model uses high-temperature steam as a heat source for indirect heating. After the steam exchanges heat with the material, condensate is formed, which improves the utilization rate of thermal energy. The gas introduced into the dryer is only used as a moisture-carrying gas, which avoids the energy loss of hot air heating, resulting in lower energy consumption. At the same time, less exhaust gas is generated, and it is not easy to carry dust, which has the dual effects of energy saving and environmental protection. The steam rotary dryer has a larger processing capacity, which can meet the needs of large-scale production of cobalt hydroxide.

[0019] (2) For cobalt hydroxide, this invention uniquely sets up a feed baffle and an overflow plate at the feed end of the cylinder to form a dry and wet material mixing zone. An ellipsoidal steam pipe is also arranged in this zone to keep dry cobalt hydroxide material in this zone. When wet materials with high viscosity enter this zone, they will first mix with dry materials. Through the movement of the tipping plate, the dry and wet materials can be mixed more evenly, reducing the viscosity of the materials and avoiding sticking to the pipe and wall. After the dry and wet materials are mixed, they continue to move forward from the overflow plate to avoid overburning of the materials in this zone.

[0020] (3) The ellipsoidal steam pipe of this utility model has greater advantages compared with ordinary straight steam pipes. First, the steam heat exchange area is larger, and the contact with the material is more thorough. Second, the high-temperature condensate formed after steam heat exchange can accumulate at the bottom of the ellipsoid, and can continue to transfer heat with the material. It is discharged after the bottom of the ellipsoid is completely filled with condensate, making full use of the heat of the high-temperature condensate and improving the energy utilization rate. At the same time, multiple layers of steam pipes are designed inside the cylinder, which are connected by a condensate collection channel at the discharge end. The condensate is collected in the innermost condensate outlet pipe and discharged. The innermost condensate outlet pipe can buffer the condensate. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Figure 1 This is a schematic diagram of the overall structure of the cobalt hydroxide steam rotary drying device of this utility model;

[0023] Figure 2 This is a schematic diagram of the feed end of the cobalt hydroxide steam rotary drying device of this utility model;

[0024] Figure 3This is a schematic diagram of the discharge end of the cobalt hydroxide steam rotary dryer of this utility model;

[0025] Figure 4 This is a cross-sectional view of the steam rotary dryer of this utility model;

[0026] Figure 5 This is a cross-sectional view of the radial baffle plate of this utility model;

[0027] Figure 6 This is a cross-sectional view of the overflow plate of this utility model.

[0028] The diagram is for illustrative purposes only.

[0029] The components include: 1. Feeding bin; 2. Feeding screw; 3. Motor; 4. Feeding hood; 5. Cylinder; 6. Discharge hood; 7. High-temperature rotary joint; 8. Transmission device; 9. Radial baffle plate; 10. Axial baffle plate; 11. Gas channel; 12. Dry and wet material mixing zone; 13. Overflow plate; 14. Inner spiral ribbon; 15. Outer spiral ribbon; 16. End plate; 17. Condensate outlet pipe; 18. Steam inlet main pipe; 19. Condensate outlet channel; 20. Elliptical steam pipe; 21. Arc-shaped turning plate; 22. Straight turning plate; 23. Fixing plate; 24. Elliptical condensate pipe. Detailed Implementation

[0030] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0031] Example 1

[0032] In a typical embodiment of this utility model, such as Figures 1-6 As shown, a cobalt hydroxide steam rotary dryer is provided, including a cylinder 5. The front end of the cylinder 5 is connected to a feeding screw 2. A radial baffle 9, an axial baffle 10, and an overflow plate 13 are provided at the front end of the cylinder 5. A dry and wet material mixing zone 12 is formed between the radial baffle 9, the axial baffle 10, and the overflow plate 13. An ellipsoidal steam pipe 20 is provided inside the cylinder 5. High-temperature steam is introduced into the ellipsoidal steam pipe 20 to dry the material entering the cylinder 5.

[0033] In this embodiment, the ellipsoidal steam pipe 20 is arranged in multiple layers from the inside out. Multiple ellipsoidal steam pipes in each layer are arranged in a uniform ring. Adjacent layers of ellipsoidal steam pipes are connected through a condensate outlet channel 19. The innermost ellipsoidal steam pipe serves as an ellipsoidal condensate pipe 24, connected to the condensate outlet pipe 17. The remaining layers of ellipsoidal steam pipes are connected to the main steam inlet pipe 18. The innermost ellipsoidal condensate pipe 24 serves both as a condensate collection pipe and as a buffer. Compared to straight steam pipes, ellipsoidal steam pipes have a larger heat exchange area, allowing for more thorough contact with cobalt hydroxide materials. The high-temperature condensate formed after steam heat exchange can accumulate at the bottom of the ellipsoid, continuing to transfer heat with the materials. Therefore, ellipsoidal steam pipes can slow down the outflow rate of condensate. Since the condensed steam still has a high temperature, rapid outflow would cause heat loss. Fully utilizing the heat of the condensate for heat exchange with the materials can improve energy utilization efficiency. Furthermore, ellipsoidal steam pipes have a larger surface area, resulting in a larger contact area with the materials and more thorough heat exchange.

[0034] Furthermore, the end of the ellipsoidal steam pipe near the rear end of the cylinder is fixed by an end plate 16. The end plate 16 seals the ends of the condensate outlet pipe 17 and the steam inlet main pipe 18 located inside the cylinder. The ends of the condensate outlet pipe and the steam inlet main pipe located outside the cylinder are connected to the condensate pipe and the steam pipe through a high-temperature rotary joint 7. The steam pipe inside the cylinder 5 is supported by a fixing plate 23.

[0035] In this embodiment, one end of the radial baffle 9 is fixed to the inner wall surface of the front end of the cylinder, and the other end is connected to the axial baffle 10. The feeding screw 2 extends into the axial baffle 10. The radial baffle 9 is conical, and the axial baffle 10 is cylindrical. The connected radial and axial baffles form a funnel shape, which prevents material from entering the feeding hood.

[0036] Furthermore, an inner spiral ribbon 14 is provided on the inner wall surface of the axial baffle plate 10, and an outer spiral ribbon 15 is provided on the outer wall surface of the axial baffle plate 10. The unique structures of the inner spiral ribbon 14 and the outer spiral ribbon 15 are located on both sides of the axial baffle plate 10. When the cylinder rotates, the spiral ribbon structure can push the material towards the discharge end inside the cylinder, which not only cleans the material in the gas channel, but also pushes the material in the mixing area towards the discharge end.

[0037] like Figure 5 As shown, multiple arc-shaped turning plates 21 are provided on the inner wall surface of the radial baffle plate 9 at the material contact end.

[0038] In this embodiment, the overflow plate 13 is fixed to the inner wall of the cylinder 5. The overflow plate 13 has multiple circular holes for the ellipsoidal steam pipe 20 to pass through. Multiple straight-flipping material plates 22 are provided on the end face of the overflow plate 13 facing the front end of the cylinder. The overflow plate 13 is conical in shape. Due to the presence of the overflow plate, dry material will always be present in the dry and wet material mixing zone 12.

[0039] To increase the mixing efficiency of cobalt hydroxide in this area, four arc-shaped turning plates 21 are installed on the radial baffle surface, four straight turning plates 22 are added inside the overflow plate 13, and an external spiral ribbon 15 is added to the axial baffle plate 10. These structures can rotate with the cylinder, effectively turning the cobalt hydroxide material, which is beneficial for mixing dry and wet materials, uniform heat exchange between the material and the steam pipe, and accelerating the dehydration process. In addition, the overflow plate is designed at an inclined angle to ensure that the dry and wet cobalt hydroxide mixture moves forward with the cylinder in a timely manner. The mixed material overflows the overflow plate as the cylinder rotates, continues to exchange heat with the steam straight pipe, and is discharged from the discharge port below the discharge hood 6 after drying.

[0040] In this embodiment, the front end of the cylinder 5 is used as the feeding end and the rear end is used as the discharging end. Therefore, a feeding hood 4 is provided at the front end of the cylinder 5, and a humid gas outlet is provided above the feeding hood 4. A discharging hood 6 is provided at the rear end of the cylinder 5, and a humid gas inlet is provided above the discharging hood.

[0041] Moisture-carrying gas enters through the moisture-carrying gas inlet above the discharge hood 6, and the moisture removed from the material is carried by the moisture-carrying gas to the moisture-carrying gas outlet above the discharge hood 6 for discharge. To prevent the material conveyed by the feed screw from entering the front end of the rotary dryer through the airflow channel 11, affecting the normal discharge of the airflow and increasing the dust content of the exhaust gas, an internal screw belt 14 is provided on the axial baffle plate 10 to transport the material overflowing along the gas channel 11 back to the dry and wet material mixing zone 12 of the dryer.

[0042] In this embodiment, the outer wall of the cylinder 5 is connected to the transmission device 8 through a gear ring. The transmission device 8 drives the cylinder 5 to rotate, and at the same time, the transmission device can also tilt the cylinder at a certain angle, which is conducive to the discharge of condensate. The existing structure is adopted here.

[0043] In this embodiment, the feeding screw 2 is connected to the feeding bin 1, which stores wet material to be dried. The feeding screw 2 is driven by the motor 3 to transport the material into the cylinder 5.

[0044] The working principle of the cobalt hydroxide steam rotary dryer provided in this embodiment is as follows: the cobalt hydroxide material is temporarily stored in the feeding bin 1 and conveyed to the steam rotary dryer cylinder 5 through the feeding screw 2. In response to the problem of large stickiness and agglomeration of wet cobalt hydroxide material, the material first enters the dry and wet material mixing zone 12. This zone consists of radial baffle 9, axial baffle 10, overflow plate 13 and internal ellipsoidal steam straight pipe. The material exchanges heat with the ellipsoidal steam straight pipe. The cobalt hydroxide material in this zone will first undergo a drying and dehydration process. As the drying process proceeds and the material moves, the subsequently entering wet material mixes with the dehydrated material in this zone, which can effectively solve the problems of agglomeration and sticking to steam pipes and walls of wet cobalt hydroxide material.

[0045] In the specific application of this embodiment, a 40t / t cobalt hydroxide steam rotary dryer with a feed moisture content of 65% and a product moisture content of less than 10% is used. The drying temperature is 130℃ and the heating steam pressure is 0.4-0.6MPa(G). Compared with disc dryers and flash dryers, this device reduces the installed power per ton of cobalt hydroxide by 45%, requires fewer pieces of equipment, significantly reduces energy consumption, and produces more uniform particle size and higher output.

[0046] The cobalt hydroxide steam rotary dryer provided in this embodiment increases material processing capacity. Its built-in ellipsoidal steam pipe offers a large heating and heat transfer area and high thermal efficiency. Addressing the issue of wet cobalt hydroxide material sticking to the walls and agglomerating, this invention incorporates a baffle ring and overflow plate at the front of the dryer cylinder, forming a wet-dry material mixing zone. This zone allows a portion of the wet cobalt hydroxide material to continue drying and mix with the added wet material, preventing adhesion. The ellipsoidal steam pipe design increases the contact area between the steam pipe and the material, resulting in more thorough heat exchange. Simultaneously, the ellipsoidal design allows high-temperature condensate to remain temporarily inside the pipe, continuing to exchange heat with the material and improving energy utilization.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cobalt hydroxide steam tumble drying apparatus, characterized by, The application relates to a dry-wet material mixing and drying device, which comprises a barrel, a feed screw connected to the front end of the barrel, a radial baffle plate, an axial baffle plate and an overflow plate arranged at the front end of the barrel, and an ellipsoidal steam pipe arranged in the barrel.

2. The cobalt hydroxide steam flash dryer of claim 1, wherein, The ellipsoidal steam pipe is sequentially provided with multiple layers from inside to outside, multiple ellipsoidal steam pipes of each layer are arranged in a ring shape, adjacent layers of the ellipsoidal steam pipes are connected through condensate water outflow channels, the innermost layer of the ellipsoidal steam pipes is connected with a condensate water outflow pipe, and the rest of the layers of the ellipsoidal steam pipes are connected with a steam inlet main pipe.

3. The cobalt hydroxide steam flash dryer of claim 2, wherein, The end of the ellipsoidal steam pipe close to the rear end of the barrel is fixed through an end plate, the end plate seals the end of the condensate water outflow pipe and the steam inlet main pipe in the barrel, and the end of the condensate water outflow pipe and the steam inlet main pipe outside the barrel is connected with the condensate water pipe and the steam pipe through a high-temperature rotary joint.

4. The cobalt hydroxide steam flash dryer of claim 1, wherein, One end of the radial baffle plate is fixed on the inner wall surface of the front end of the barrel, and the other end is connected with the axial baffle plate.

5. The cobalt hydroxide steam flash dryer of claim 4, wherein, An inner screw belt is arranged on the inner wall surface of the axial baffle plate, and an outer screw belt is arranged on the outer wall surface of the axial baffle plate.

6. The cobalt hydroxide steam flash dryer of claim 4, wherein, Multiple arc-shaped turnover plates are arranged on the inner wall surface of the end of the radial baffle plate in contact with the material.

7. The cobalt hydroxide steam flash dryer of claim 1, wherein, The overflow plate is fixed on the inner wall surface of the barrel, multiple circular holes are arranged on the overflow plate to allow the ellipsoidal steam pipe to pass through, and multiple straight turnover plates are arranged on the end surface of the overflow plate facing the front end of the barrel.

8. The cobalt hydroxide steam flash dryer of claim 1, wherein, A feed cover is arranged at the front end of the barrel, a humid gas outlet is arranged above the feed cover, a discharge cover is arranged at the rear end of the barrel, and a humid gas inlet is arranged above the discharge cover.

9. The cobalt hydroxide steam flash dryer of claim 1, wherein, The outer wall surface of the barrel is connected with a transmission device through a gear ring, and the transmission device drives the barrel to rotate.

10. The cobalt hydroxide steam flash dryer of claim 1, wherein, The feed screw is connected with a feeding bin, and the feeding bin stores wet material to be dried.

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