Atmosphere control system for high-temperature carbonization process of hard carbon negative electrode material

Abstract

The utility model provides an atmosphere control system for a high-temperature carbonization process of a hard carbon cathode material, which comprises a plurality of groups of gas supply units connected with a gas mixing and guaranteeing unit through pipelines, and the gas mixing and guaranteeing unit comprises a gas mixer connected with the gas supply units through pipelines. The gas mixer is connected with a mixed gas oxygen content detector through a pipeline, the mixed gas oxygen content detector is connected with a mixed gas mass flow meter through a pipeline, the mixed gas mass flow meter is connected with a high-temperature carbon determination furnace through a pipeline provided with a mixed gas pressure gauge, and the high-temperature carbon determination furnace is connected with a tail gas treatment unit through a pipeline. According to the utility model, a plurality of groups of gas supply units are arranged to provide various gases and are matched with the gas mixing and guaranteeing unit to provide various mixed atmospheres for the high-temperature carbon determination furnace, and the gas atmospheres in the carbonization process are accurately controlled, so that the optimal mixed atmosphere of a hard carbon negative electrode material in the high-temperature carbonization process is conveniently optimized; meanwhile, the performance stability of the hard carbon negative electrode material is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of atmosphere control system, specifically relating to an atmosphere control system for the high-temperature carbonization process of hard carbon anode materials. Background Technology

[0002] With the continuous development of sodium-ion batteries and sodium-ion battery technology, biomass hard carbon anode materials have attracted widespread attention due to their low cost, environmental friendliness, and superior performance. Hard carbon anode materials, with their disordered structure, defects, heteroatoms, and increasing graphite interlayer spacing, have broad application prospects in the field of sodium-ion batteries. However, the performance of hard carbon anode materials is greatly affected by the atmosphere during the carbonization process. Traditional carbonization processes often cannot precisely control the atmosphere, leading to unstable performance of hard carbon anode materials and failing to meet the requirements of high-performance sodium-ion batteries.

[0003] Therefore, an atmosphere control system capable of stably controlling the gas supply, mixing, detection, and exhaust gas absorption processes during carbonization is essential. Utility Model Content

[0004] The technical problem this invention aims to solve is to address the shortcomings of the prior art by providing an atmosphere control system for the high-temperature carbonization process of hard carbon anode materials. This atmosphere control system provides various gases through multiple gas supply units and, in conjunction with a gas mixing and protection unit, provides multiple mixed atmospheres to the high-temperature carbonization furnace. This allows for precise control of the gas atmosphere during the carbonization process, facilitating the selection of the optimal mixed atmosphere for the hard carbon anode material during high-temperature carbonization, while simultaneously ensuring the stable performance of the hard carbon anode material.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an atmosphere control system for the high-temperature carbonization process of hard carbon anode material, characterized in that the atmosphere control system includes multiple gas supply units, each of which is connected to a gas mixing and protection unit via a pipeline. The gas mixing and protection unit includes a gas mixer connected to the gas supply unit via a pipeline, the gas mixer being connected to a mixed gas oxygen content detector via a pipeline, the mixed gas oxygen content detector being connected to a mixed gas mass flow meter via a pipeline, the mixed gas mass flow meter being connected to a high-temperature carbonization furnace via a pipeline equipped with a mixed gas pressure gauge, and the high-temperature carbonization furnace being connected to a tail gas treatment unit via a pipeline.

[0006] The atmosphere control system for the high-temperature carbonization process of the aforementioned hard carbon anode material is characterized in that the multiple sets of gas supply units consist of two or more sets.

[0007] The above-mentioned atmosphere control system for the high-temperature carbonization process of hard carbon anode material is characterized in that the gas supply unit includes a gas generator for providing a gas source, the gas generator is connected to a gas processor through a pipeline equipped with a shut-off valve, the gas processor is connected to a gas source mass flow meter through a pipeline sequentially equipped with a pressure regulating valve, a flow regulating valve and a gas source pressure gauge, and the gas source mass flow meter is connected to a gas mixer through a pipeline equipped with a one-way valve.

[0008] The atmosphere control system for the high-temperature carbonization process of the aforementioned hard carbon anode material is characterized in that the gas processor has a tubular structure with a height-to-diameter ratio greater than 3.

[0009] The atmosphere control system for the high-temperature carbonization process of the aforementioned hard carbon anode material is characterized in that the gas processor is segmented and loaded with one or more of color-changing silica gel, molecular sieve or activated carbon, as well as a deoxidizer.

[0010] The atmosphere control system for the high-temperature carbonization process of the aforementioned hard carbon anode material is characterized in that the deoxidizer is one or more of copper-based catalysts, nickel-based catalysts, and manganese-based catalysts.

[0011] The atmosphere control system for the high-temperature carbonization process of the aforementioned hard carbon anode material is characterized in that the oxygen content detector of the mixed gas is detected every 20 min to 40 min, and the oxygen content detector of the mixed gas is a non-scattering infrared gas analyzer.

[0012] The atmosphere control system for the high-temperature carbonization process of the aforementioned hard carbon anode material is characterized in that a PID controller is used for temperature control heating in the high-temperature carbonization furnace.

[0013] The above-mentioned atmosphere control system for the high-temperature carbonization process of hard carbon anode material is characterized in that the exhaust gas treatment unit includes a first exhaust gas processor, a second exhaust gas processor, a third exhaust gas processor and a fourth exhaust gas processor connected in sequence by pipelines. The first exhaust gas processor, the second exhaust gas processor, the third exhaust gas processor and the fourth exhaust gas processor are respectively filled with four of the following: color-changing silica gel, anhydrous calcium chloride, molecular sieve, paraffin wax sheet and activated carbon. The fourth exhaust gas processor is provided with a pipeline with a vent valve.

[0014] This utility model has the following advantages compared with the prior art:

[0015] 1. This utility model provides multiple gases by setting up multiple gas supply units and cooperating with gas mixing and protection units to provide multiple mixed atmospheres for the high-temperature carbonization furnace, thereby precisely controlling the gas atmosphere during the carbonization process. This facilitates the selection of the optimal mixed atmosphere for hard carbon anode materials during the high-temperature carbonization process, while ensuring the stable performance of hard carbon anode materials.

[0016] 2. This utility model sets up a gas supply unit to further process the gas purity and flow stability to provide a stable and reliable gas source to the high-temperature carbonization furnace. It also sets up a gas mixing and protection unit to mix multiple gas sources to achieve a mixed atmosphere, control the amount of mixed gas introduced into the high-temperature carbonization furnace and the pressure inside the furnace, and ensure the performance of the hard carbon anode material after high-temperature carbonization, thereby controlling the high-temperature carbonization effect of the hard carbon anode material.

[0017] 3. This utility model provides data support for industrial applications by setting up a mixed gas oxygen content detector and transmitting the data to synchronously update the carbonization process in real time.

[0018] 4. This utility model achieves high-temperature carbonization by heating the hard carbon anode material in a high-temperature carbonization furnace. By setting up an exhaust gas treatment unit, it completes the purification and discharge of exhaust gas, preventing environmental pollution and meeting environmental protection requirements for discharge.

[0019] 5. This utility model allows for flexible adjustment of reaction pressure and temperature through various valves and heating systems, thereby optimizing process conditions and ensuring the stability of hard carbon anode materials. It also facilitates real-time monitoring of the carbonization process of hard carbon anode materials in multiple dimensions, such as pressure, temperature, flow rate, and purity, solving problems such as the inability of existing carbonization equipment to accurately control the atmosphere and purify exhaust gas.

[0020] 6. This utility model solves the problems of unstable performance of hard carbon anode materials caused by the inability to control the purity and stability of the gas source and the inability to accurately control the mixing ratio of the gas in the prior art, as well as the environmental protection problems caused by the lack of absorption and treatment of exhaust gas.

[0021] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the atmosphere control system for the high-temperature carbonization process of the hard carbon anode material of this invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1—Gas supply unit; 1-1—Gas generator; 1-2—Stop valve;

[0025] 1-3—Gas processor; 1-4—Pressure regulator; 1-5—Flow regulator;

[0026] 1-6—Gas source pressure gauge; 1-7—Gas source mass flow meter; 1-8—Check valve;

[0027] 2—Gas mixing and protection unit; 2-1—Gas mixer; 2-2—Oxygen content detector of mixed gas;

[0028] 2-3—Mixed gas mass flow meter; 2-4—Mixed gas pressure gauge; 3—High-temperature carbonization furnace;

[0029] 4—Exhaust gas treatment unit; 4-1—First exhaust gas processor; 4-2—Second exhaust gas processor;

[0030] 4-3—Third exhaust gas processor; 4-4—Fourth exhaust gas processor; 4-5—Vent valve. Detailed Implementation

[0031] like Figure 1 As shown, the atmosphere control system for the high-temperature carbonization process of a hard carbon anode material according to this utility model includes multiple gas supply units 1. Each gas supply unit 1 is connected to a gas mixing and protection unit 2 via a pipeline. The gas mixing and protection unit 2 includes a gas mixer 2-1 connected to the gas supply unit 1 via a pipeline. The gas mixer 2-1 is connected to a mixed gas oxygen content detector 2-2 via a pipeline. The mixed gas oxygen content detector 2-2 is connected to a mixed gas mass flow meter 2-3 via a pipeline. The mixed gas mass flow meter 2-3 is connected to a high-temperature carbonization furnace 3 via a pipeline equipped with a mixed gas pressure gauge 2-4. The high-temperature carbonization furnace 3 is connected to a tail gas treatment unit 4 via a pipeline.

[0032] It should be noted that by setting up multiple gas supply units 1 to provide a variety of gases, and cooperating with gas mixing and protection unit 2 to provide a variety of mixed atmospheres for high-temperature carbonization furnace 3, it is convenient to select the optimal mixed atmosphere for hard carbon anode material during high-temperature carbonization process, while ensuring the performance stability of hard carbon anode material.

[0033] It should be noted that by setting up a gas supply unit 1, the gas purity and flow stability are further processed to provide a stable and reliable gas source to the high-temperature carbonization furnace 3.

[0034] It should be noted that by setting up a gas mixing and protection unit 2, the gas mixer 2-1 is used to mix multiple gas sources to achieve a mixed atmosphere, the mixed gas oxygen content detector 2-2 is used to detect the oxygen content in the mixed gas to ensure the performance of the hard carbon anode material after high-temperature carbonization, and the mixed gas mass flow meter 2-3 and mixed gas pressure gauge 2-4 are used to detect the flow rate and pressure of the mixed gas, and to control the amount of mixed gas fed into the high-temperature carbonization furnace 3 and the pressure inside the high-temperature carbonization furnace 3, thereby controlling the high-temperature carbonization effect of the hard carbon anode material.

[0035] It should be noted that high-temperature carbonization is achieved by heating the hard carbon anode material in a high-temperature carbonization furnace 3.

[0036] It should be noted that by setting up exhaust gas treatment unit 4, the exhaust gas is purified and discharged into the air, and other post-treatment processes are completed to prevent environmental pollution.

[0037] In this embodiment, there are two or more sets of gas supply units 1. By controlling the number of gas supply units 1, the composition of the mixed gas can be controlled, and the number of gas supply units 1 can be flexibly adjusted according to the required atmosphere.

[0038] like Figure 1 As shown, in this embodiment, the gas supply unit 1 includes a gas generator 1-1 for providing a gas source. The gas generator 1-1 is connected to a gas processor 1-3 via a pipeline equipped with a shut-off valve 1-2. The gas processor 1-3 is connected to a gas source mass flow meter 1-7 via a pipeline sequentially equipped with a pressure regulating valve 1-4, a flow regulating valve 1-5, and a gas source pressure gauge 1-6. The gas source mass flow meter 1-7 is connected to a gas mixer 2-1 via a pipeline equipped with a check valve 1-8. By setting the gas generator 1-1 to provide a gas source, setting the shut-off valve 1-2 to control the output of the gas source, setting the gas processor 1-3 to further process the purity of the gas, setting the pressure regulating valve 1-4 and the flow regulating valve 1-5 to ensure the stability of the pressure, flow rate, and flow direction of the gas during flow, setting the gas source pressure gauge 1-6 to measure the gas flow rate, and setting the check valve 1-8 to prevent the backflow of the mixed gas in the gas mixer 2-1.

[0039] It should be noted that gas generator 1-1 can be a nitrogen generator, hydrogen generator, or other generators, or it can be a compressed gas cylinder containing the required gas.

[0040] In this embodiment, the gas processor 1-3 is a tubular structure with a height-to-diameter ratio greater than 3. By designing the gas processor 1-3 as a tubular structure and controlling the height-to-diameter ratio, it is ensured that the gas is in full contact with the deoxidizer in the gas processor 1-3, thereby improving the gas purity and facilitating the processing of the gas by the filling material. If the height-to-diameter ratio is greater than 3 or less than 3, the gas may exit from the gas processor 1-3 before it is completely deoxidized.

[0041] In this embodiment, gas processors 1-3 are segmented and loaded with one or more of the following: color-changing silica gel, molecular sieve, and activated carbon, as well as a deoxidizer. By loading one or more of the following: color-changing silica gel, molecular sieve, and activated carbon, as well as the deoxidizer, the gas is treated to improve its purity.

[0042] In this embodiment, the deoxidizer is one or more of copper-based catalysts, nickel-based catalysts, and manganese-based catalysts. The function of copper-based, nickel-based, and manganese-based catalysts as deoxidizers is to utilize metals such as copper, manganese, and nickel as active components to react chemically with O2, generating oxides and thus removing oxygen. Among them, copper-based catalysts have relatively low cost and strong versatility; nickel-based catalysts are prepared by co-precipitation using nickel as the active component and alumina as the support; and manganese-based catalysts are prepared by co-precipitation using manganese as the active component. While manganese-based deoxidizers have relatively small capacity, commercially available indicator deoxidizers are all manganese-based, characterized by changing from green to dark brown after oxygen absorption and returning to green after activation and regeneration.

[0043] It should be noted that the deoxidizer is preferably a manganese-based catalyst.

[0044] In this embodiment, the oxygen content detector 2-2 of the mixed gas is detected every 20 to 40 minutes. The oxygen content detector 2-2 is a non-scattering infrared gas analyzer. By detecting every 20 to 40 minutes, the oxygen content of the mixed gas is controlled in real time.

[0045] In this embodiment, the heating of the high-temperature carbonization furnace 3 is stopped when the pressure detected by the mixed gas pressure gauge 2-4 exceeds 0.2 MPa. If the pressure exceeds 0.2 MPa, it indicates an abnormal reaction, and the heating should be stopped and the abnormality checked.

[0046] In this embodiment, a PID controller is used for temperature control heating in the high-temperature carbon-fixing furnace 3. The PID controller (Proportional-Integral-Derivative controller) has the following advantages when performing temperature control heating: Precise control: The PID controller can precisely control the temperature and reduce errors by combining the three parameters of proportional (P), integral (I), and derivative (D); Fast response: Derivative control can predict the future trend of the system, enabling the controller to respond quickly to temperature changes and reduce system lag; Elimination of steady-state error: Integral control can eliminate the steady-state error of the system, ensuring that the temperature is controlled near the set point and that there will be no long-term deviation; Stability: The PID controller can provide stable control output, reduce system oscillation, and make temperature control more stable; Flexibility: The parameters of the PID controller can be adjusted according to different system characteristics and control requirements, exhibiting high flexibility; Strong adaptability: The PID controller can adapt to various heating systems and environmental conditions, exhibiting good versatility; Energy saving: By precisely controlling the heating power, the PID controller can reduce unnecessary energy consumption, achieving energy-saving effects; Reduced wear: Because the PID controller can reduce system oscillation and over-adjustment, it can reduce the wear of heating elements and extend their service life.

[0047] like Figure 1As shown, in this embodiment, the exhaust gas treatment unit 4 includes a first exhaust gas processor 4-1, a second exhaust gas processor 4-2, a third exhaust gas processor 4-3, and a fourth exhaust gas processor 4-4 connected sequentially via pipelines. The first exhaust gas processor 4-1, the second exhaust gas processor 4-2, the third exhaust gas processor 4-3, and the fourth exhaust gas processor 4-4 are respectively filled with four of the following: color-changing silica gel, anhydrous calcium chloride, molecular sieve, paraffin wax flakes, and activated carbon. By using these four materials to treat the exhaust gas, the exhaust gas is purified, preventing environmental pollution. The color-changing silica gel can absorb moisture and visually indicate the water content through color changes; anhydrous calcium chloride is mainly used as a desiccant, effectively absorbing and removing water vapor, improving treatment efficiency; the molecular sieve utilizes its high specific surface area and strong adsorption capacity to adsorb impurities in the exhaust gas; the paraffin wax flakes adsorb and fix organic matter on the paraffin surface, thereby achieving the effect of purifying the exhaust gas; and the activated carbon utilizes its high specific surface area and strong adsorption capacity to adsorb impurities in the exhaust gas.

[0048] In actual use, the following steps are included:

[0049] Step 1: Fill gas processor 1-3 with half of the color-changing silica gel and half of the copper catalyst, separate them with cotton and seal them with cotton. Then, add color-changing silica gel, anhydrous calcium chloride, molecular sieve and paraffin sheets to the first tail gas processor 4-1, the second tail gas processor 4-2, the third tail gas processor 4-3 and the fourth tail gas processor 4-4 in sequence, and seal them with cotton as well.

[0050] Step 2: Place the untreated hard carbon anode material into the high-temperature carbon fixation furnace 3, and open the vent valve 4-5 of the exhaust gas treatment unit 4.

[0051] Step 3: Open gas generator 1-1, shut-off valve 1-2, pressure regulating valve 1-4, flow regulating valve 1-5 and check valve 1-8 to introduce gas into gas mixer 2-1, and check the airtightness of the atmosphere control system. Then adjust the pressure regulating valve 1-4 and flow regulating valve 1-5 to adjust the gas flow and purge the atmosphere control system.

[0052] Step 4: Use a high-temperature carbonization furnace 3 to carbonize the hard carbon anode material at high temperature.

[0053] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of this utility model shall still fall within the protection scope of this utility model.

Claims

1. An atmosphere control system for the high-temperature carbonization process of hard carbon anode materials, characterized in that, The atmosphere control system includes multiple gas supply units (1), each of which is connected to a gas mixing and protection unit (2) via a pipeline. The gas mixing and protection unit (2) includes a gas mixer (2-1) connected to the gas supply unit (1) via a pipeline. The gas mixer (2-1) is connected to a mixed gas oxygen content detector (2-2) via a pipeline. The mixed gas oxygen content detector (2-2) is connected to a mixed gas mass flow meter (2-3) via a pipeline. The mixed gas mass flow meter (2-3) is connected to a high-temperature carbonization furnace (3) via a pipeline equipped with a mixed gas pressure gauge (2-4). The high-temperature carbonization furnace (3) is connected to a tail gas treatment unit (4) via a pipeline.

2. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 1, characterized in that, The gas supply unit (1) consists of two or more groups.

3. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 1, characterized in that, The gas supply unit (1) includes a gas generator (1-1) for providing a gas source. The gas generator (1-1) is connected to a gas processor (1-3) through a pipeline with a shut-off valve (1-2). The gas processor (1-3) is connected to a gas source mass flow meter (1-7) through a pipeline with a pressure regulating valve (1-4), a flow regulating valve (1-5), and a gas source pressure gauge (1-6) installed in sequence. The gas source mass flow meter (1-7) is connected to a gas mixer (2-1) through a pipeline with a check valve (1-8).

4. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 3, characterized in that, The gas processor (1-3) has a tubular structure with a height-to-diameter ratio greater than 3.

5. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 4, characterized in that, The gas processor (1-3) is divided into sections containing one or more of the following: color-changing silica gel, molecular sieve, or activated carbon, as well as a deoxidizer.

6. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 5, characterized in that, The deoxidizer is one or more of copper-based catalysts, nickel-based catalysts, and manganese-based catalysts.

7. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 1, characterized in that, The oxygen content detector (2-2) of the mixed gas is detected every 20 min to 40 min. The oxygen content detector (2-2) of the mixed gas is a non-scattering infrared gas analyzer.

8. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 1, characterized in that, The high-temperature carbon furnace (3) uses a PID controller for temperature control and heating.

9. The atmosphere control system for the high-temperature carbonization process of hard carbon anode material according to claim 1, characterized in that, The exhaust gas treatment unit (4) includes a first exhaust gas processor (4-1), a second exhaust gas processor (4-2), a third exhaust gas processor (4-3), and a fourth exhaust gas processor (4-4) connected in sequence by pipelines. The first exhaust gas processor (4-1), the second exhaust gas processor (4-2), the third exhaust gas processor (4-3), and the fourth exhaust gas processor (4-4) are respectively filled with four of the following: color-changing silica gel, anhydrous calcium chloride, molecular sieve, paraffin wax flakes, and activated carbon. The fourth exhaust gas processor (4-4) is provided with a pipeline with a vent valve (4-5).

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