A system for preparing a carbon electrode material

Abstract

The utility model relates to a kind of preparation systems of carbon electrode material, belong to electrochemical energy storage technical field, it includes: active carbon feeding bin, fluidized bed, microwave generator, dust collector group, fan and exhaust cylinder connected in turn;The discharge outlet of active carbon feeding bin is connected with the first feed port of fluidized bed bottom by screw conveyor, and the medicine barrel equipped with phenolic resin solution is connected with the second feed port of fluidized bed bottom by screw pump, and the bottom of fluidized bed is also provided with air inlet.The system can realize mass production of liquid flow battery carbon electrode material, process is stable, while ensuring the high specific surface area and excellent electrochemical performance of carbon electrode material, by uniform spraying, wrapping of high molecular material to carbon powder, the strength and impact resistance of carbon material are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical energy storage technology, specifically to a preparation system for a carbon electrode material. Background Technology

[0002] Energy storage technology is a revolutionary technology that will bring about changes to the development and operation of future energy systems. Among the many energy storage technologies, electrochemical energy storage technology has made the fastest progress. Electrochemical energy storage technology, mainly based on lithium-ion batteries and flow batteries, has achieved major breakthroughs in safety, energy conversion efficiency and economy, and has great prospects for industrial application.

[0003] Electrochemical energy storage refers to the process of using chemical elements as energy storage media to convert electrical energy into chemical energy through chemical reactions and store it in batteries. Electrochemical energy storage systems mainly consist of battery packs, battery management systems (BMS), energy management systems (EMS), power converters (PCS), and other electrical equipment. The battery pack is the most important component of the energy storage system, responsible for energy storage. A single cell in a flow battery stack typically consists of the following parts: an electrolyte tank, internal electrodes, and an ion-conducting membrane, achieving the conversion of chemical energy into electrical energy through electrochemical reactions.

[0004] Commonly used electrode materials include porous carbon materials, metal oxides, and polymers. Among them, porous carbon materials are the most widely used, and their advantages mainly lie in their large specific surface area, low price, good electrochemical stability, and mature technology.

[0005] Currently, the main processes for preparing carbon electrode materials in China include high-temperature activation, chemical activation, and hydrothermal oxidation. Each method has its advantages and disadvantages. For example, patent ZL202020650619.8 uses a three-stage high-temperature activation method to heat the carbon material to a maximum of 1400℃, resulting in high energy consumption. Patent ZL201710702918.4 uses a method of high-temperature activation with an activating agent followed by acid washing. While this method improves the electrochemical activity of the carbon electrode material, it suffers from insufficient strength. Most domestic patents related to carbon electrode material preparation focus on describing the processes and steps used in laboratory pilot-scale tests. While the technology is generally mature at this stage, there are relatively few patents on equipment / devices for large-scale preparation of carbon electrode materials. Most patents only focus on improving the electrochemical performance and increasing the specific surface area of ​​activated carbon, neglecting the strength of the carbon material and its impact resistance in electrochemical reactions.

[0006] Therefore, it is necessary to design a carbon electrode material preparation system to overcome the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a carbon electrode material preparation system that enables mass production of carbon electrode materials for flow batteries with stable processes. While ensuring the high specific surface area and excellent electrochemical performance of the carbon electrode material, the system also greatly improves the strength and impact resistance of the carbon material by uniformly spraying and coating the carbon powder with polymer materials.

[0008] This utility model provides a carbon electrode material preparation system, comprising: an activated carbon feeding bin, a fluidized bed, a microwave generator, a dust collector group, a fan, and an exhaust stack connected in sequence; the outlet of the activated carbon feeding bin is connected to the first inlet at the bottom of the fluidized bed via a screw conveyor, and a solvent tank containing phenolic resin solution is connected to the second inlet at the bottom of the fluidized bed via a screw pump; the bottom of the fluidized bed is also provided with an air inlet.

[0009] Preferably, a temperature display for monitoring the outlet temperature is provided at the top of the fluidized bed.

[0010] Preferably, a visualization window is provided in the middle of the fluidized bed.

[0011] Preferably, the top of the microwave generator is provided with a rectifier grid for uniform material output.

[0012] Preferably, the microwave generator contains multiple magnetrons that are evenly distributed on the inner wall of the microwave generator.

[0013] Preferably, the internal temperature of the microwave generator is maintained at 150℃-200℃.

[0014] Preferably, the pipe connected to the microwave generator outlet is also equipped with a damper for adjusting the amount of ambient temperature air drawn in, and a temperature display for monitoring the temperature is provided on the side of the pipe where the damper is discharging material.

[0015] Preferably, the dust collector group includes a cyclone dust collector and a bag dust collector connected in sequence.

[0016] Preferably, two cyclone dust collectors are connected in series between the microwave generator and the bag filter.

[0017] Preferably, the fluidized bed is provided with multiple nozzles connected to the second feed inlet.

[0018] This invention has the following advantages and beneficial effects: The system reprocesses powdered activated carbon after high-temperature activation. Hot air is blown into a fluidized bed, and phenolic resin is sprayed under specific temperature conditions, causing it to uniformly adhere to and coat the surface of the powdered activated carbon. Microwave heating further strengthens the adhesion. The properties of the phenolic resin polymer protect the carbon powder, significantly improving the strength of the carbon material and preventing breakage and fragmentation during long-term use. The downstream process involves two-stage cyclone dust removal and baghouse dust collection, followed by multi-stage sieving of the carbon powder to ultimately obtain high-quality, highly stable carbon electrode material. This system offers advantages such as continuous large-scale production, fast reaction speed, high sieving accuracy, and the production of carbon electrode material with high activity, high strength, and strong impact resistance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the carbon electrode material preparation system according to a preferred embodiment of the present invention; Explanation of icon numbers: 1. Activated carbon feeding hopper; 2. Screw conveyor; 3. Fluidized bed; 4. Microwave generator; 5. Cyclone dust collector; 6. Bag filter dust collector; 7. Fan; 8. Exhaust stack; 9. Second feed inlet; 10. Screw pump; 11. Dissolving tank; 12. First feed inlet; 13. Air inlet; 14. Temperature display; 15. Visualization window; 16. Rectifier screen; 17. Magnetron; 18. Damper. Detailed Implementation

[0020] To better understand this utility model, the following embodiments are further illustrations of this utility model, but the content of this utility model is not limited to the following embodiments.

[0021] like Figure 1 As shown, a carbon electrode material preparation system includes: an activated carbon feeding bin 1, a screw conveyor 2, a fluidized bed 3, a microwave generator 4, a two-stage cyclone dust collector 5, a bag filter 6, a fan 7, and an exhaust stack 8, connected in sequence.

[0022] The activated carbon feeding bin 1 is connected to the first feed port 12 on the lower side of the fluidized bed 3 via a screw conveyor 2, and is used to continuously feed powdered activated carbon raw materials into the fluidized bed 3. Here, it refers to dry powder material that has been treated with activator doping and activated at high temperature.

[0023] Meanwhile, the second feed inlet 9 at the bottom of the fluidized bed 3 is connected to the screw pump 10 and the dissolving tank 11 in sequence through plastic pipes. First, a phenolic resin solution of a certain concentration is prepared in the dissolving tank 11, stirred evenly, and then pumped into the fluidized bed 3 by the screw pump 10. It enters from the bottom and is evenly sprayed upward through multiple nozzles to fully contact the powdered activated carbon in the fluidized bed 3.

[0024] like Figure 1 As shown, an air inlet 13 is provided at the bottom of the fluidized bed 3 to supply hot air at 40-80℃ to the inside of the fluidized bed 3 to heat the material. At this temperature, the phenolic resin droplets and powdered activated carbon can better fuse and encapsulate, forming a uniform carbon material. A temperature display instrument 14 is provided at the top of the fluidized bed 3 to monitor the outlet temperature, and a visualization window 15 is provided in the middle of the fluidized bed 3 to facilitate viewing the internal reaction status at any time.

[0025] The microwave generator 4 has a conical bottom and a rectifier mesh 16 at the top to ensure uniform material output. The microwave generator 4 also has 3-5 groups of magnetrons 17, with 5-8 magnetrons per group, evenly distributed on the inner wall of the generator 4. The internal temperature of the microwave generator 4 is maintained at 150℃-200℃. At this temperature, the carbon powder coated with phenolic resin undergoes a carbonization reaction, and the phenolic resin undergoes dehydration and dehydrogenation reactions to generate products containing a large amount of carbon. This process not only improves the thermal stability of the phenolic resin but also endows it with good electrical conductivity and chemical stability, thereby enhancing the overall strength of the carbon electrode material and extending its service life.

[0026] The microwave generator 4 outlet pipe is also equipped with a damper 18, and a temperature display instrument 14 for monitoring temperature is provided on the side of the pipe where the damper 18 is discharging. It draws in room temperature air to cool the material to below 80°C. The size of the damper 18 is adjusted to control the amount of air mixed in, reduce the risk of spontaneous combustion of the subsequent carbon sample, and facilitate subsequent dust removal and screening.

[0027] After cooling, the material sequentially enters a two-stage cyclone dust collector 5 and a bag filter dust collector 6 for multiple dust removal and sieving processes. The material sieved in the first-stage cyclone dust collector 5 has a mesh size of 40-120 mesh, the material sieved in the second-stage cyclone dust collector 5 has a mesh size of 120-160 mesh, and the material sieved in the bag filter dust collector 6 has a mesh size of less than 160 mesh. Different mesh sizes of the cyclone dust collector 5 and bag filter dust collector 6 can be selected according to actual needs to obtain carbon electrode materials with different particle sizes, meeting the application requirements of different scenarios. Finally, the dust-removed airflow is extracted by the fan 7 and discharged into the atmosphere through the exhaust stack 8.

[0028] This system further processes powdered activated carbon after high-temperature activation. Hot air is blown into a fluidized bed 3, and phenolic resin is sprayed onto the surface of the powdered activated carbon under specific temperature conditions. This coating is then uniformly applied and coated with the resin. Microwave heating further strengthens the adhesion. The properties of the phenolic resin polymer protect the carbon powder, significantly improving the strength of the carbon material and preventing breakage or fracture during long-term use. The carbon powder is then subjected to multi-stage sieving using a two-stage cyclone dust collector and a bag filter, ultimately yielding high-quality, highly stable carbon electrode material. This system offers advantages such as continuous large-scale production, fast reaction speed, high sieving accuracy, and the production of carbon electrode materials with high activity, high strength, and strong impact resistance.

[0029] The above description is merely a preferred embodiment of the present utility model, and should not be construed as limiting the scope of the present utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present utility model, and these improvements and modifications are also considered to be within the scope of protection of the present utility model.

Claims

1. A system for preparing carbon electrode materials, characterized in that, include: The activated carbon feeding hopper, fluidized bed, microwave generator, dust collector group, fan and exhaust stack are connected in sequence; the outlet of the activated carbon feeding hopper is connected to the first inlet at the bottom of the fluidized bed through a screw conveyor, and the dissolving tank containing phenolic resin solution is connected to the second inlet at the bottom of the fluidized bed through a screw pump. The bottom of the fluidized bed is also equipped with an air inlet.

2. The carbon electrode material preparation system as described in claim 1, characterized in that: A temperature display is installed at the top of the fluidized bed to monitor the outlet temperature.

3. The carbon electrode material preparation system as described in claim 1, characterized in that: A visualization window is located in the middle of the fluidized bed.

4. The carbon electrode material preparation system as described in claim 1, characterized in that: The top of the microwave generator is equipped with a rectifier grid to ensure uniform material output.

5. The carbon electrode material preparation system as described in claim 1, characterized in that: The microwave generator contains multiple magnetrons, which are evenly distributed on the inner wall of the microwave generator.

6. The carbon electrode material preparation system as described in claim 1, characterized in that: The internal temperature of the microwave generator is maintained at 150℃-200℃.

7. The carbon electrode material preparation system as described in claim 1, characterized in that: The pipe connecting to the microwave generator outlet is also equipped with a damper for adjusting the amount of ambient temperature air drawn in, and a temperature display for monitoring the temperature is located on the side of the pipe where the damper is discharging material.

8. The carbon electrode material preparation system as described in claim 1, characterized in that: The dust collector assembly consists of a cyclone dust collector and a bag filter dust collector connected in sequence.

9. The carbon electrode material preparation system as described in claim 8, characterized in that: Two cyclone dust collectors are connected in series between the microwave generator and the bag filter.

10. The carbon electrode material preparation system as described in claim 1, characterized in that: The fluidized bed is equipped with multiple nozzles connected to the second feed inlet.

Images