Online graphitization particle size detection device

Abstract

The utility model discloses an online graphitization particle size detection device which is arranged on a continuous graphitization production line and comprises a high-pressure inert gas supply device, a Venturi tube, a dry laser particle analyzer and an air extractor, the output end of the high-pressure inert gas supply device is connected with the input end of the Venturi tube, the output end of the Venturi tube is connected with the input end of the dry laser particle analyzer, the continuous graphitization production line is provided with a sampling port and a material return port, and a throat pipe of the Venturi tube is connected with the sampling port; the output end of the dry laser particle analyzer is connected with the input end of the air extractor, and the output end of the air extractor is connected with the material return port. The online graphitization granularity detection device can detect the granularity of a continuous graphitization material on line in real time, so that key indexes of the graphitization material can be controlled in time, the fluctuation of the indexes in a reasonable range is reduced, and the qualified rate of products is improved.

Description

Technical Field

[0001] This utility model relates to the field of graphite processing technology, and in particular to an online graphitization particle size detection device. Background Technology

[0002] With the development of lithium battery material technology, continuous graphitization technology has matured significantly. Its simple process, short production cycle, and low production cost have garnered considerable attention from the industry. It integrates multiple processes such as furnace loading, power supply, cooling, and unloading, achieving continuous production with a high degree of automation. Currently, small-batch production products are available on the market, and their technical specifications meet customer requirements. However, online detection technology accompanying continuous graphitization has not yet made significant progress, leading to fluctuations in the technical specifications of continuously graphitized products. Currently, it is not possible to adjust process parameters in a timely manner to keep product technical specifications within a reasonable range and improve product yield. Against this backdrop, online detection technology for continuous graphitization needs to be rapidly improved to keep pace with the development of continuous graphitization technology. Utility Model Content

[0003] The purpose of this invention is to provide an online graphitization particle size detection device that can detect the particle size of continuous graphitized materials in real time, making the key indicators of graphitized materials controllable in a timely manner, reducing the fluctuation of indicators within a reasonable range, and improving the product qualification rate.

[0004] To achieve the above objectives, the present invention provides an online graphitization particle size detection device, which is installed on a continuous graphitization production line. The device includes a high-pressure inert gas supply device, a Venturi tube, a dry laser particle size analyzer, and an extraction device. The output end of the high-pressure inert gas supply device is connected to the input end of the Venturi tube, and the output end of the Venturi tube is connected to the input end of the dry laser particle size analyzer. The continuous graphitization production line is provided with a sampling port and a return port. The throat of the Venturi tube is connected to the sampling port. The output end of the dry laser particle size analyzer is connected to the input end of the extraction device, and the output end of the extraction device is connected to the return port.

[0005] Compared with existing technologies, this invention utilizes a high-pressure inert gas supply device to input high-pressure inert gas into the venturi tube, creating a negative pressure at the throat of the venturi tube. This negative pressure allows for the extraction of graphitized material from the sampling port, achieving rapid and continuous online sampling. Furthermore, the use of an extraction device in conjunction with the high-pressure inert gas supply device creates a high-pressure unidirectional conveying channel between the input and output ends of the dry laser particle size analyzer. Therefore, the entire process of the graphitized material, from sampling input to detection and finally to the output return port, is fully automated and continuous. The entire process is simple and controllable, thus greatly satisfying the requirements for automatic detection and real-time feedback. This enables online detection of the graphitized particle size of the graphitized material, allowing the control system to provide real-time feedback of the detection results to the continuous graphitization production line. This helps the continuous graphitization production line adjust process parameters in a timely manner, ensuring that product technical indicators fluctuate within a reasonable range and effectively improving the product qualification rate.

[0006] Preferably, the online graphitization particle size detection device further includes a control system, which is communicatively connected to the high-pressure inert gas supply device, the dry laser particle size analyzer, and the gas extraction device.

[0007] Specifically, the online graphitization particle size detection device further includes a control valve. The output end of the high-pressure inert gas supply device is connected to the input end of the control valve, and the output end of the control valve is connected to the input end of the venturi tube. The output of the high-pressure inert gas is controlled by the control valve, thereby controlling the negative pressure at the throat and thus controlling the number of samples taken.

[0008] Specifically, the high-pressure inert gas supply device is a high-pressure nitrogen supply device.

[0009] Specifically, the air extraction device is an axial flow fan.

[0010] Specifically, the online graphitization particle size detection device includes a sample inlet tube, which is connected between the throat of the venturi tube and the sampling port. By providing the sample inlet tube, the connection between the venturi tube and the sampling port can be made more convenient. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the online graphitization particle size detection device of this utility model installed on a continuous graphitization production line.

[0012] Figure 2 This is a structural diagram of the online graphitization particle size detection device of this utility model. Detailed Implementation

[0013] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0014] like Figure 1 and Figure 2 As shown, the online particle size detection device 2 disclosed in this utility model is installed on a continuous graphitization production line 200. The online particle size detection device 2 includes a high-pressure inert gas supply device 21, a control valve 22, a venturi tube 23, a dry laser particle size analyzer 24, and an exhaust device 25; the exhaust device 25 is an axial flow fan. The output end of the high-pressure inert gas supply device 21 is connected to the input end of the control valve 22, and the output end of the control valve 22 is connected to the input end of the venturi tube 23. The output end of the venturi tube 23 is connected to the input end of the dry laser particle size analyzer 24. The continuous graphitization production line is provided with a sampling port and a return port. The throat of the venturi tube 23 is connected to the sampling port 202. By setting the control valve 22, the output of the high-pressure inert gas can be controlled, thereby controlling the negative pressure at the throat and thus controlling the number of samples. The output end of the dry laser particle size analyzer 24 is connected to the input end of the vacuum pump 25, and the output end of the vacuum pump 25 is connected to the return port 203 through a pipe 251. The high-pressure inert gas supply device 21 is a high-pressure nitrogen supply device.

[0015] Please see again Figure 1 The online graphitization particle size detection device 2 also includes a control system 3, which is communicatively connected to the high-pressure inert gas supply device 21, the control valve 22, the dry laser particle size analyzer 23, the air extraction device 24, and the continuous graphitization production line 200.

[0016] Please see again Figure 2 Specifically, the online particle size detection device 2 includes a sample inlet tube 26, which is connected between the throat of the venturi tube 23 and the sampling port 202. By providing the sample inlet tube 26, the connection between the venturi tube 23 and the sampling port 202 can be made more convenient.

[0017] Based on the above and in conjunction with the accompanying drawings, the working principle of the online graphitization particle size detection device 2 of this utility model will be specifically explained below:

[0018] First, the material is graphitized using a continuous graphitization production line of 200 pairs. Petroleum coke is used as the raw material. The petroleum coke is first coarsely crushed into particles with a diameter of 10-50mm. The material with a diameter of 10-50mm is then further crushed into particles with a diameter of 0.5-20mm by crushing equipment such as jaw crusher, hammer crusher, and roller crusher. Carbonaceous raw materials are ground into fine powder particles with a Dv50 of 15 μm using equipment such as Raymond mills and ball mills. Graphite raw materials are mixed with asphalt in different proportions, with a mixing ratio of 100:15, to complete the granulation process. Then, the carbonaceous paste formed by graphite and asphalt is molded into particles of a certain shape to complete the shaping process. The shaped particles are then loaded into a specially designed heating furnace for high-temperature heat treatment, which carbonizes the asphalt in the green body. The asphalt coke formed by the asphalt carbon binds the carbonaceous aggregate and powder particles together. The carbonized material is then fed into a continuous graphitization furnace at a rate of 500 kg / h. The graphitized material becomes artificial graphite. After being cooled to below 150 degrees Celsius in a nitrogen-protected atmosphere, the artificial graphite is then transported through pipelines to a grinding mill for pulverization. The pulverized samples flow on the production line until the next process, at which point online graphitization degree and particle size tests are performed.

[0019] The control system 3 is activated, and the signal from the control system 3 activates the high-pressure inert gas supply device 21, control valve 22, and dry laser particle size analyzer 24. High-pressure nitrogen flows into the venturi tube 23, where a negative pressure is generated at the throat of the venturi tube 23. This negative pressure carries the graphite out of the production line through the sample inlet 26 and sampling port 202, forming a mixture of graphite sample and nitrogen gas, which is then introduced into the dry laser particle size analyzer 24. The control system 3 adjusts the opening and closing degree of the control valve 22 on the dry laser particle size analyzer 24 according to the degree of light shading, stabilizing the degree of light shading within the range of 3-7% for a stabilization time greater than 0.5 seconds. At this time, the dry laser particle size analyzer 24 starts the measurement program to detect the particle size of the graphite sample (the graphite sample does not need to stop after being transported into the dry laser particle size analyzer 24; the dry laser particle size analyzer 24 can detect the graphite sample while it is flowing). After testing, the graphite sample is returned to the continuous graphitization production line 200 through the return port 203 by the negative pressure generated by the vacuum device 25. The measured outputs Dv10, Dv50, Dv90, and Dv99 data. After testing, the particle size Dv50 is confirmed and controlled according to the required Dv50 = 10µm ± 1.5µm, monitored every 10 minutes to ensure the artificial graphite particle size is within the required range. If the test results are outside the above range, the control system 3 feeds back to the continuous graphitization production line 200 for process adjustments.

[0020] Compared with the prior art, this utility model uses a high-pressure inert gas supply device 21 to input high-pressure inert gas into the venturi tube 23, which generates a negative pressure at the throat of the venturi tube 23. This negative pressure allows the graphitized material in the sampling port 202 to be extracted, achieving the purpose of online rapid and continuous sampling. Furthermore, the output of high-pressure nitrogen is controlled by control valve 22, thereby controlling the negative pressure at the throat and thus controlling the sampling quantity. The suction device 25, in conjunction with the high-pressure inert gas supply device 21, forms a high-pressure unidirectional conveying channel between the input and output ends of the dry laser particle size analyzer 24. Therefore, the entire process of graphitized material from sampling input to detection and finally to the output return port 203 is fully automated and continuous. The entire process is simple and controllable, achieving automatic detection and enabling online detection of the graphitized particle size of the graphitized material. The control system 3 can then instantly feed the detection results back to the continuous graphitization production line 200, helping the continuous graphitization production line 200 to adjust process parameters in a timely manner, ensuring that product technical indicators fluctuate within a reasonable range and effectively improving the product qualification rate.

[0021] The structure and detection principle of the dry laser particle size analyzer 24 involved in the continuous graphitization online measurement system 100 of this utility model are well known to those skilled in the art, and will not be described in detail here.

[0022] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. An online graphitization particle size detection device, which is arranged on a continuous graphitization production line, characterized in that: The online graphitization particle size detection device comprises a high-pressure inert gas supply device, a Venturi tube, a dry laser particle size instrument and a gas extraction device; the output end of the high-pressure inert gas supply device is connected with the input end of the Venturi tube; the output end of the Venturi tube is connected with the input end of the dry laser particle size instrument; the continuous graphitization production line is provided with a sampling port and a material return port; the throat of the Venturi tube is connected with the sampling port; the output end of the dry laser particle size instrument is connected with the input end of the gas extraction device; and the output end of the gas extraction device is connected with the material return port.

2. The on-line graphitization particle size detection device according to claim 1, characterized by: The online graphitization particle size detection device further comprises a control system which is in communication connection with the high-pressure inert gas supply device, the dry laser particle size instrument and the gas extraction device.

3. The on-line graphitization particle size detection device of claim 1, wherein: The online graphitization particle size detection device further comprises a control valve; the output end of the high-pressure inert gas supply device is connected with the input end of the control valve; and the output end of the control valve is connected with the input end of the Venturi tube.

4. The on-line graphitization particle size detection device of claim 1, wherein: The high-pressure inert gas supply device is a high-pressure nitrogen gas supply device.

5. The on-line graphitization particle size detection device of claim 1, wherein: The gas extraction device is an axial flow fan.

6. The in-line graphitization particle size detection device of claim 1, wherein: The online graphitization particle size detection device further comprises a sample inlet pipe which is connected between the throat of the Venturi tube and the sampling port.

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