Control method of rotary kiln and electronic equipment

Abstract

The invention discloses a control method of a rotary kiln and electronic equipment, and relates to the technical field of battery manufacturing. The method can determine an initial value of a sintering period of a target material calcined through the rotary kiln based on initial parameter values of a plurality of process parameters of the rotary kiln, obtain the yield of a calcined product obtained by calcining the target material based on the initial value, and determine the yield of the calcined product based on a comparison result of the yield and an expected yield of the calcined product. And target parameter values of all the process parameters are obtained, and then the rotary kiln is controlled to operate according to the target parameter values. Therefore, the method can automatically obtain the target parameter value of the working parameter according to the difference value between the yield and the expected yield, and control the operation of the rotary kiln according to the target parameter value. Compared with a manual experience-based control mode, the control efficiency of the rotary kiln is improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a control method and electronic equipment for a rotary kiln. Background Technology

[0002] In preparing electrode materials, the lithium source and precursor are first uniformly mixed to obtain a mixed raw material. This mixed raw material is then placed in a sagger and subsequently placed in a roller kiln for preliminary sintering to obtain the positive electrode active material. The positive electrode active material is then pulverized and placed in a rotary kiln for secondary sintering to obtain the final electrode material. During this process, the operation of the rotary kiln needs to be controlled.

[0003] In related technologies, the operation of rotary kilns is usually controlled manually based on work experience. However, manual control is inefficient. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art. Therefore, the first objective of this application is to provide a method for controlling a rotary kiln, the method comprising: Based on the initial parameter values ​​of multiple process parameters of the rotary kiln, the initial value of the sintering cycle of the target material calcined by the rotary kiln is determined, wherein the multiple process parameters include at least two of the following: filling rate, rotation speed and tilt angle. Based on the initial value of the sintering cycle, the yield of the calcined product obtained by calcining the target material is obtained, and the yield is negatively correlated with the sintering cycle. Based on the comparison between the output and the expected output of the calcined product, target parameter values ​​for each process parameter are obtained. The target parameter values ​​are obtained based on the initial parameter values. Controlling the operation of the rotary kiln according to the target parameter values ​​can ensure that the difference between the output of the calcined product and the expected output is within the difference range, and can ensure that the sintering cycle of the target material is within the expected cycle range of the target material under the target parameter values. The rotary kiln is controlled to operate according to the target parameter values.

[0005] Optionally, based on the initial parameter values ​​of multiple process parameters of the rotary kiln, an initial value for the sintering cycle of the target material calcined in the rotary kiln is determined, including: Obtain the particle size and density of the target material; Based on the particle size and the density, a target period determination model that is compatible with the target material is obtained from multiple period determination models. Based on the target cycle determination model and the initial parameter values ​​of multiple process parameters of the rotary kiln, the initial value of the sintering cycle of the target material calcined in the rotary kiln is determined.

[0006] Optionally, the density includes: tapped density and loose packing density; the target material is a positive electrode material; the particle size of the target material is greater than or equal to 10 micrometers and less than or equal to 13 micrometers; the tapped density of the target material is greater than or equal to 2.4 g / cm³ and less than or equal to 2.8 g / cm³; the loose packing density of the target material is greater than or equal to 2.2 g / cm³ and less than or equal to 2.5 g / cm³; and the target period determination model satisfies: ; T The sintering cycle of the target material. φ The fill rate, L The length of the rotary kiln body is given. n The rotational speed is... α The inclination angle is described above.

[0007] Optionally, the output is the daily output. P satisfy: ; in, ρ The density of the target material. V The volume of the rotary kiln is [missing information]. φ The fill rate is mentioned.

[0008] Optionally, based on the comparison between the yield and the expected yield of the calcined product, target parameter values ​​for each of the process parameters are obtained, including: If the comparison result indicates that the difference between the output and the expected output is within the range of the difference, then the initial parameter value of each of the process parameters is determined as the target parameter value of the process parameter; If the comparison result indicates that the difference between the output and the expected output is outside the range of the difference, then the initial parameter value of at least one of the process parameters is adjusted to obtain the target parameter value of each of the process parameters. The target parameter value of each of the process parameters is within the range of the parameter values ​​of the process parameters.

[0009] Optionally, adjusting the initial parameter value of at least one of the process parameters includes: First, adjust the initial parameter value of the rotation speed. If it is still not possible to make the difference between the output and the expected output within the range of the difference, then adjust the initial parameter value of the tilt angle, and finally adjust the initial parameter value of the filling rate.

[0010] Optionally, adjusting the initial parameter value of at least one of the process parameters includes: If the output exceeds the expected output, reduce the initial value of at least one of the process parameters. If the output is less than the expected output, increase the initial parameter value of at least one of the process parameters.

[0011] Optionally, controlling the operation of the rotary kiln according to the target parameter value includes: Based on the target parameter values ​​of multiple process parameters, the feed rate of the target material is obtained; The rotary kiln is controlled to operate according to the target parameter values ​​and the feed rate.

[0012] Optionally, based on the target parameter values ​​of the plurality of process parameters, the feed rate of the target material is obtained, including: Based on the target parameter values ​​of the multiple process parameters, the target value of the sintering cycle is determined; Based on the target value of the sintering cycle, the feed rate of the target material is obtained, and the feed rate is negatively correlated with the sintering cycle.

[0013] In some embodiments, the rotary kiln control method provided in this application may include: Obtain the particle size and density of the target material; Based on the particle size and density of the target material, a target period determination model that is compatible with the target material is obtained from multiple period determination models; The initial parameter values ​​of multiple process parameters of the rotary kiln for calcining the target material are input into the target cycle determination model to obtain the initial value of the sintering cycle of the target material output by the target cycle determination model. The multiple process parameters include at least two of the following: filling rate, rotation speed and tilt angle. Based on the initial value of the sintering cycle, the yield of the calcined product obtained by calcining the target material is obtained, and the yield is negatively correlated with the sintering cycle. Based on the comparison between the output and the expected output of the calcined product, target parameter values ​​for each process parameter are obtained. The target parameter values ​​are obtained based on the initial parameter values. Controlling the operation of the rotary kiln according to the target parameter values ​​can ensure that the difference between the output of the calcined product and the expected output is within the difference range, and can ensure that the sintering cycle of the target material is within the expected cycle range of the target material under the target parameter values. Based on the target parameter values ​​of the multiple process parameters, the target value of the sintering cycle is determined; Based on the target value of the sintering cycle, the feed rate of the target material is obtained, and the feed rate is negatively correlated with the sintering cycle; The rotary kiln is controlled to operate according to the target parameter values ​​and the feed rate.

[0014] In some embodiments, the rotary kiln control method provided in this application may include: Obtain the particle size and density of the target material; Based on the particle size and density of the target material, a target period determination model that is compatible with the target material is obtained from multiple period determination models; The initial parameter values ​​of multiple process parameters of the rotary kiln for calcining the target material are input into the target cycle determination model to obtain the initial value of the sintering cycle of the target material output by the target cycle determination model. The multiple process parameters include at least two of the following: filling rate, rotation speed and tilt angle. Based on the initial value of the sintering cycle, the yield of the calcined product obtained by calcining the target material is obtained, and the yield is negatively correlated with the sintering cycle. If the difference between the output and the expected output of the calcined product is outside the range of difference, the initial parameter value of the rotation speed is adjusted first. If it is still impossible to make the difference between the output and the expected output within the range of difference, the initial parameter value of the tilt angle is adjusted, and finally the initial parameter value of the filling rate is adjusted to obtain the target parameter values ​​of each process parameter. Controlling the operation of the rotary kiln according to the target parameter values ​​can make the difference between the output of the calcined product and the expected output within the range of difference, and can make the sintering cycle of the target material within the expected cycle range of the target material under the target parameter values. Based on the target parameter values ​​of the multiple process parameters, the target value of the sintering cycle is determined; Based on the target value of the sintering cycle, the feed rate of the target material is obtained, and the feed rate is negatively correlated with the sintering cycle; The rotary kiln is controlled to operate according to the target parameter values ​​and the feed rate.

[0015] In some embodiments, for target materials with a particle size greater than or equal to 10 micrometers and less than or equal to 13 micrometers, a tap density greater than or equal to 2.4 g / cm³ and less than or equal to 2.8 g / cm³, a loose packing density greater than or equal to 2.2 g / cm³ and less than or equal to 2.5 g / cm³, and of a type of cathode material, the rotary kiln control method provided in this application may include: Based on the initial parameter values ​​of multiple process parameters of the rotary kiln, an initial value for the sintering cycle of the target material calcined in the rotary kiln is determined. These multiple process parameters include at least two of the following: filling rate, rotational speed, and tilt angle. The sintering cycle of the target material is... T satisfy: , φ The fill rate, LThe length of the rotary kiln body is given. n The rotational speed is... α The tilt angle is mentioned; Based on the initial value of the sintering cycle, the yield of the calcined product obtained by calcining the target material is obtained, and the yield is negatively correlated with the sintering cycle. If the difference between the output and the expected output of the calcined product is outside the range of difference, the initial parameter value of the rotation speed is adjusted first. If it is still impossible to make the difference between the output and the expected output within the range of difference, the initial parameter value of the tilt angle is adjusted, and finally the initial parameter value of the filling rate is adjusted to obtain the target parameter values ​​of each process parameter. Controlling the operation of the rotary kiln according to the target parameter values ​​can make the difference between the output of the calcined product and the expected output within the range of difference, and can make the sintering cycle of the target material within the expected cycle range of the target material under the target parameter values. Based on the target parameter values ​​of the multiple process parameters, the target value of the sintering cycle is determined; Based on the target value of the sintering cycle, the feed rate of the target material is obtained, and the feed rate is negatively correlated with the sintering cycle; The rotary kiln is controlled to operate according to the target parameter values ​​and the feed rate.

[0016] A second objective of this application is to provide an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the rotary kiln control method as described above.

[0017] A third objective of this application is to provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the rotary kiln control method as described above.

[0018] The fourth objective of this application is to provide a computer program product comprising a computer program that, when executed by a processor, implements the rotary kiln control method as described above.

[0019] The beneficial effects of the technical solution provided in this application include at least the following: This application provides a control method and electronic device for a rotary kiln. This method determines the initial value of the sintering cycle of the target material calcined in the rotary kiln based on the initial parameter values ​​of multiple process parameters of the rotary kiln. Based on this initial value, it obtains the yield of the calcined product obtained from the calcined target material. Furthermore, based on the comparison between the yield and the expected yield of the calcined product, it obtains the target parameter values ​​for each process parameter, and then controls the operation of the rotary kiln according to the target parameter values. Therefore, this method can automatically obtain the target parameter values ​​of the operating parameters based on the difference between the yield and the expected yield, and control the operation of the rotary kiln according to the target parameter values, making it particularly suitable for the field of lithium-ion battery cathode materials. Compared to manual control of rotary kilns based on experience, this method improves the control efficiency of the rotary kiln. Furthermore, controlling the rotary kiln according to target parameter values ​​not only ensures that the difference between the yield of the calcined product and the expected yield is within a certain range, but also ensures that the target value of the sintering cycle of the target material is within the expected cycle range of the target material under that target parameter value. Therefore, it can effectively increase production capacity and reduce product energy consumption while ensuring the performance of the calcined product (i.e., calcination quality). In addition, it reduces reliance on manual labor, which can improve the control accuracy of the rotary kiln to a certain extent and simplify the operation for staff.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] Figure 1 This is a flowchart of a rotary kiln control method provided in an embodiment of this application; Figure 2 This is a flowchart of another rotary kiln control method according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0023] This application provides a control method for a rotary kiln, which is applied to an electronic device. Optionally, the electronic device can be a rotary kiln control device, a mobile terminal, a fixed terminal, or a server. The mobile terminal can be a mobile phone, laptop, or tablet computer. The fixed terminal can be a desktop computer. The server can be a single server, a server cluster consisting of several servers, or a cloud computing service center. See also... Figure 1 The method includes: Step 101: Based on the initial parameter values ​​of multiple process parameters of the rotary kiln, determine the initial value of the sintering cycle of the target material calcined in the rotary kiln.

[0024] The process parameters include at least two of the following: filling rate, rotational speed (also known as the kiln chamber speed), and tilt angle. For example, the process parameters may include: filling rate, rotational speed, and tilt angle.

[0025] Step 102: Based on the initial value of the sintering cycle, obtain the yield of calcined products obtained from calcining the target material.

[0026] The output is negatively correlated with the initial value of the sintering cycle and positively correlated with the quality of the target material.

[0027] Step 103: Based on the comparison results between the yield and the expected yield of the calcined product, obtain the target parameter values ​​for each process parameter.

[0028] The target parameter values ​​for each process parameter are obtained based on the initial parameter values. Controlling the rotary kiln operation according to the target parameter values ​​ensures that the difference between the calcined product yield and the desired yield is within a certain range, and that the sintering cycle value is within the desired cycle range for the target material under those target parameter values. This desired cycle range is the ideal reaction time range for the target material under those target parameter values, and is determined based on the reaction characteristics of the target material and the target parameter values. This desired cycle range can be pre-acquired by electronic equipment.

[0029] It is understandable that if the process parameters are set to the target values, the sintering cycle value will be the target value for the sintering cycle.

[0030] Step 104: Control the operation of the rotary kiln according to the target parameter values ​​of multiple process parameters.

[0031] The electronic equipment obtains target parameter values ​​for multiple process parameters and can control the operation of the rotary kiln according to these target parameter values.

[0032] In summary, the embodiments of this application provide a control method for a rotary kiln. This method can determine the initial value of the sintering cycle of the target material calcined in the rotary kiln based on the initial parameter values ​​of multiple process parameters of the rotary kiln. Based on the initial value, it obtains the yield of the calcined product obtained from the calcined target material. Based on the comparison between the yield and the expected yield of the calcined product, it obtains the target parameter values ​​of each process parameter, and then controls the operation of the rotary kiln according to the target parameter values. Therefore, this method can automatically obtain the target parameter values ​​of the operating parameters based on the difference between the yield and the expected yield, and control the operation of the rotary kiln according to the target parameter values. Compared to manual control of rotary kilns based on experience, this method improves the control efficiency of the rotary kiln. Furthermore, controlling the rotary kiln according to target parameter values ​​not only ensures that the difference between the yield of the calcined product and the expected yield is within a certain range, but also ensures that the sintering cycle of the target material is within the expected cycle range of the target material under that target parameter value. Therefore, it can effectively increase production capacity and reduce product energy consumption while ensuring the performance of the calcined product (i.e., calcination quality). In addition, it reduces reliance on manual labor, which can improve the control accuracy of the rotary kiln to a certain extent and simplify the operation for staff.

[0033] Figure 2 This is a flowchart of another rotary kiln control method provided in an embodiment of this application, which can be applied to electronic devices. See also... Figure 2 The method may include: Step 201: Obtain the initial parameter values ​​of multiple process parameters of the rotary kiln, as well as the particle size and density of the target material calcined in the rotary kiln.

[0034] The process parameters include at least two of the following: filling rate, rotational speed, and tilt angle. For example, multiple process parameters may include: filling rate, rotational speed, and tilt angle. Filling rate refers to the percentage of the target material's volume relative to the total kiln capacity. Rotational speed refers to the speed at which the rotary kiln rotates. Tilting angle refers to the angle between the kiln's axial direction and the horizontal direction. This horizontal direction is parallel to the ground. The target material can be a cathode material, such as a ternary cathode material. Density may include: tapped density and loose density.

[0035] In this embodiment, the operator can input the initial parameter values ​​of the multiple process parameters, as well as the particle size and density of the target material, into the electronic equipment of the rotary kiln. Accordingly, the electronic equipment can then acquire the initial parameter values ​​of the multiple process parameters, as well as the particle size and density of the target material.

[0036] Understandably, the filling rate, rotational speed, and inclination angle of a rotary kiln all affect the sintering cycle of the material. Specifically, the larger the inclination angle of the rotary kiln, the faster the axial movement of the material during accumulation or agitation, thus affecting the sintering cycle.

[0037] As the filling ratio changes, the packing morphology of the material and the collision frequency between particles will change, which will indirectly change the axial movement speed of the material. This speed will affect the sintering cycle (also known as calcination time) of the material, and thus also affect the degree of sintering.

[0038] The rotary kiln is equipped with lifting plates on its inner wall. As the kiln rotates, these lifting plates also rotate. Under the combined action of friction from the kiln's inner wall and the thrust of the lifting plates, the material rises along the kiln's inner wall. After reaching a certain height, it rolls down due to gravity, thus being tumbled and lifted, ensuring uniform heating. Because the kiln itself is inclined, each time the material rolls down, it moves a small section towards the lower end of the kiln (i.e., the discharge end), resulting in axial movement. The rotational speed affects the rate of this axial movement, thereby influencing the sintering cycle.

[0039] Step 202: Based on the particle size and density of the target material, obtain the target period determination model that is compatible with the target material from multiple period determination models.

[0040] Electronic devices can pre-store cycle determination models for various types of materials. Since different types of cathode materials have specific particle size and density ranges, the electronic device can determine the material type of the target material based on its particle size and density, and then retrieve the corresponding cycle determination model from a pool of stored models. The electronic device can then use this cycle determination model as the target cycle determination model compatible with the target material. The target material's material type can be at least one of the following: NCM111, NCM811, NCM83, NCM / 522, NCM622, and NCA. NCM refers to lithium nickel cobalt manganese oxide. NCA refers to lithium nickel cobalt aluminum oxide.

[0041] In the embodiments of this application, the cycle determination model for any type of material can satisfy: Formula (1) In formula (1), T For the sintering cycle, φ The filling rate of the rotary kiln. Based on the properties of any given material type and the filling rate of the rotary kiln. φ The determined correction coefficient k, i.e., k= . L The length of the rotary kiln body (i.e., kiln length) is the axial length of the rotary kiln. n The rotational speed of the rotary kiln. D The inner diameter of the rotary kiln. α The tilt angle of the rotary kiln. Inner diameter.D It will affect the material's stacking shape and the linear velocity of the material as it moves along the kiln wall or baffle, thus affecting the sintering cycle.

[0042] In the embodiments of this application, the properties of different types of materials, such as viscosity, flowability, particle size, and density, will vary, and the viscosity, flowability, particle size, and density of the material will also affect the sintering cycle. That is, under the same sintering conditions, the sintering cycle of materials with different properties will differ. For example, the better the flowability and the lower the viscosity of the sintered material, the faster the axial movement speed of the material will be, and the shorter the sintering cycle will be. However, some properties of the material (such as viscosity and flowability) are difficult to measure, and the degree of correlation with the sintering cycle is difficult to determine directly.

[0043] Furthermore, changes in the filling rate lead to variations in the material's packing morphology and the collision frequency between particles, indirectly altering the axial movement speed of the material and thus affecting the sintering cycle. Therefore, this embodiment utilizes a correction coefficient k to represent the filling rate. φ The influence of material properties on the sintering cycle is considered. This allows for a more comprehensive consideration of influencing factors when determining the sintering cycle, enabling accurate determination of the sintering cycle.

[0044] In this embodiment, the electronic device can identify 'a' and 'b' in the correction coefficient k in advance using actual production data. Specifically, for various types of materials, the electronic device can obtain multiple historical actual sintering cycles for the material and identify 'a' and 'b' based on these actual sintering cycles and the corresponding historical parameter values ​​of the process parameters. For example, the electronic device can identify parameters 'a' and 'b' using optimization algorithms such as nonlinear least squares, genetic algorithms, or particle swarm optimization.

[0045] Since a and b can be obtained based on actual production data, it can be ensured that the obtained a and b are more in line with actual industrial applications. This ensures that the accuracy of the sintering cycle determined by the cycle determination model is much higher than that of the classical model based on ideal assumptions, which can effectively guide production and optimize output and efficiency.

[0046] For example, assume the target material has a particle size of 10-13 micrometers, a tap density of 2.4-2.8 g / cm³, and a loose density of 2.2-2.5 g / cm³. That is, the material type of the target material can be NCM811. Then, a can be 0.0861, and b can be greater than or equal to -0.6377 and less than or equal to -0.6211, such as -0.6299. In other words, in this case, the target period determination model can be: Formula (2) Furthermore, the target period determination model shown in formula (2) above can also be applied to determine the sintering period of materials with properties similar to NCM811.

[0047] Step 203: Based on the target cycle determination model and the initial parameter values ​​of multiple process parameters of the rotary kiln, determine the initial value of the sintering cycle of the target material calcined in the rotary kiln.

[0048] The electronic device can input the initial parameter values ​​of these multiple process parameters into the target cycle determination model, thereby obtaining the sintering cycle of the target material output by the target cycle determination model.

[0049] For example, assuming the target material is NCM811, the electronic device can bring the initial parameter values ​​of multiple process parameters of the rotary kiln into the formula (2) mentioned above to obtain the initial value of the sintering cycle of the NCM811 material.

[0050] Step 204: Based on the initial value of the sintering cycle, obtain the yield of calcined products obtained from calcining the target material.

[0051] This output is negatively correlated with the initial value of the sintering cycle and positively correlated with the quality of the target material. This output can be the daily output.

[0052] In this embodiment of the application, during the actual sintering process, after sintering in a hot kiln, the product needs to be cooled in a cold kiln for m minutes to obtain the calcined product. Based on this, taking daily output as an example, the output of the calcined product is... P It can satisfy: Formula (3) In formula (3), ρ For the density of the material, V This refers to the volume of the rotary kiln. ρ × V × φ This refers to the mass of the material during the sintering cycle.

[0053] Understandably, for cathode materials with a particle size of 10-13 micrometers, a tap density of 2.4-2.8 g / cm³, and a loose packing density of 2.2-2.5 g / cm³, such as NCM811, m can be 120. At this point, the yield of the calcined product... P It can satisfy: Formula (4) Step 205: Based on the comparison between the yield of calcined products and the expected yield of calcined products, obtain the target parameter values ​​for each process parameter.

[0054] After obtaining the yield of the calcined product, the electronic equipment can compare the yield with the expected yield to obtain a comparison result. Subsequently, based on this comparison result, the electronic equipment can obtain the target parameter values ​​for each process parameter. Controlling the rotary kiln operation according to the target parameter values ​​ensures that the difference between the yield of the calcined product and the expected yield is within a certain range, and that the sintering cycle value is within the expected cycle range of the target material under that target parameter value. This expected cycle range is the ideal reaction time range of the target material under that target parameter value, and is determined based on the reaction characteristics of the target material and the target parameter value. This expected cycle range can be pre-acquired by the electronic equipment.

[0055] The comparison result can indicate that the difference between the output and the expected output is within a certain range, or that the difference is outside that range. This range can be pre-stored by the electronic device.

[0056] If the comparison result indicates that the difference between the output and the expected output is within the acceptable range, the electronic equipment can determine that controlling the rotary kiln operation according to the initial process parameters will result in an output of calcined products close to the expected output. Therefore, for each process parameter, the electronic equipment can determine the initial parameter value as the target parameter value, thereby obtaining the target parameter values ​​for multiple process parameters.

[0057] If the comparison result indicates that the difference between the actual output and the expected output is outside the expected range, the electronic equipment can determine that controlling the rotary kiln operation according to the initial process parameters results in a significant discrepancy between the calcined product output and the expected output. Therefore, for each process parameter, the electronic equipment can adjust the initial parameter value to obtain the target parameter value, thereby obtaining target parameter values ​​for multiple process parameters. The target parameter values ​​for each process parameter must fall within the specified range.

[0058] In this embodiment of the application, the electronic device can first adjust the initial parameter value of the rotation speed. If it is still not possible to make the difference between the output and the expected output within the range of the difference, then adjust the initial parameter value of the tilt angle, and finally adjust the initial parameter value of the filling rate.

[0059] In other words, when adjusting the initial values ​​of process parameters, rotational speed is prioritized, followed by tilt angle, and then filling rate. This adjustment method is particularly suitable for scenarios involving calcined cathode materials.

[0060] In some optional embodiments, if the comparison result indicates that the difference between the output and the expected output is outside the range of difference, and if the output is less than the expected output, the electronic device can increase the initial value of at least one process parameter within the range of at least one process parameter. That is, the electronic device can increase the initial value of the fill rate within the range of the fill rate parameter; and / or increase the initial value of the rotational speed within the range of the rotational speed parameter; and / or increase the initial value of the tilt angle within the range of the tilt angle parameter. The range of fill rate (or rotational speed, tilt angle) parameter values ​​can all be pre-stored by the electronic device.

[0061] If the output exceeds the expected output, the electronic equipment can reduce the initial value of at least one process parameter within a range of process parameter values. That is, the electronic equipment can reduce the initial value of the fill rate within a range of fill rate parameters; and / or, reduce the initial value of the rotational speed within a range of rotational speed parameters; and / or, reduce the initial value of the tilt angle within a range of tilt angle parameters.

[0062] In some alternative embodiments, the electronic device can determine the adjustment step size for each process parameter based on the difference between the production yield and the desired production yield. This adjustment step size is positively correlated with the difference. The electronic device can then adjust the initial parameter value of each process parameter using the adjustment step size.

[0063] In this embodiment, the electronic device can adjust the initial parameter value of at least one process parameter multiple times until the difference between the yield of the calcined product calculated based on the adjusted initial parameter value and the expected yield is within the difference range, and the sintering cycle value is within the expected cycle range. Then, the electronic device can determine the adjusted initial parameter values ​​of each process parameter as the target parameter values.

[0064] Step 206: Based on the target parameter values ​​of multiple process parameters, obtain the feed rate of the target material.

[0065] In this embodiment, the electronic device can determine the target value of the sintering cycle based on target parameter values ​​of multiple process parameters. Subsequently, the electronic device can obtain the feed rate of the target material based on the target value of the sintering cycle. This feed rate is inversely proportional to the target value of the sintering cycle.

[0066] Optionally, this feed rate W It can satisfy: Formula (5) For example, assuming the target material is NCM811, then the feed rate of the target material is... W NCM811 It can satisfy: Formula (6) Step 207: Control the operation of the rotary kiln according to the target parameter values ​​and the feed rate.

[0067] If the electronic device is not the control device for the rotary kiln, then after receiving the feed rate, it can send the target parameter value and the feed rate to the control device of the rotary kiln. The control device can then control the operation of the rotary kiln according to the target parameter value and the feed rate.

[0068] If the electronic device is the control device for the rotary kiln, then after obtaining the feed rate, the electronic device can directly control the operation of the rotary kiln according to the target parameter value and the feed rate.

[0069] The following is an exemplary description of the process of obtaining parameters a and b in the correction coefficient k by fitting actual production data: The electronic equipment can acquire multiple sets of actual production data and obtain the corresponding correction coefficient k based on each set of actual production data. As shown in Table 1, each set of actual production data can include historical parameter values ​​for parameters such as rotational speed, kiln length, kiln inner diameter, inclination angle, feed rate, sintering cycle, rotary kiln volume, material density, and filling rate. The normal filling rate range is 8% to 12%.

[0070] Table 1

[0071] As shown in Table 1, the rate at which the correction coefficient k decreases slows significantly with increasing fill rate. Therefore, it can be determined that k is related to... φ The power function can then be fitted to obtain the correction coefficients a and b using methods such as linear fitting.

[0072] The following section compares the actual sintering period X min with the sintering period Y min predicted by the target period determination model described above, assuming a rotary kiln length of 17m, an inner diameter of 1.68m, and a material type of NCM811: By adjusting the values ​​of parameters such as rotary kiln speed (0.058 / 0.084), tilt angle (0.5°, 0.7°), feed rate (1482.99 kg / h, 1673.52 kg / h, 1713.68 kg / h, 1831.12 kg / h), and corresponding filling rate, the sintering cycle of the material under a certain condition was obtained based on the time it takes for the material to start continuously entering and exiting the rotary kiln. The comparison results are detailed in Table 2.

[0073] In Table 2, the actual sintering period X min in each set of examples is the average of the results of more than 10 repeated verifications. The deviation Z% between the predicted sintering period and the actual sintering period satisfies: Z%(YX) / X*100%.

[0074] Table 2

[0075] As can be seen from Examples 1 to 4 in Table 2, the absolute value of the deviation Z% between the sintering period Y predicted by the target period determination model provided in this application and the actual measured sintering period X is ≤2.0%. Therefore, the target period determination model provided in this application has high reliability.

[0076] The following section uses NCM811 as an example to illustrate the calcination process of the target material: (1) Prepare a mixed salt solution of a certain concentration by accurately mixing nickel salt (such as NiSO4·6H2O), cobalt salt (such as CoSO4·7H2O), and manganese salt (such as MnSO4·H2O) in a molar ratio of 8:1:1; (2) Use NaOH or KOH as a precipitant and ammonia (NH3·H2O) as a complexing agent (ammonia can form complexes with metal ions, effectively controlling the precipitation rate, which is the key to forming spherical particles), and pump the salt solution, alkaline solution, and ammonia simultaneously into an inert atmosphere (such as N2, to prevent Mn2 from forming precipitates). + In the oxidized reaction vessel; after the reaction, Ni² + Co² + Mn² + Co-precipitation forms a nucleus that gradually grows into an ideal spherical Ni. 0.8 Co 0.1 Mn 0.1 (OH)2 precursor particles; (3) Lithium source LiOH·H2O and precursor are uniformly mixed to obtain mixed raw materials, and the mixed raw materials are placed in a saggar for sintering treatment. After that, they are taken out, crushed and sintered again. After cooling, the positive electrode active material of NCM811 series is obtained.

[0077] It is understood that the order of steps in the rotary kiln control method provided in this application embodiment can be appropriately adjusted, and steps can be added or removed as needed. For example, step 206 can be deleted as appropriate. Any variations that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application, and therefore will not be elaborated further.

[0078] In summary, the embodiments of this application provide a control method for a rotary kiln. This method can determine the initial value of the sintering cycle of the target material calcined in the rotary kiln based on the initial parameter values ​​of multiple process parameters of the rotary kiln. Based on the initial value, it obtains the yield of the calcined product obtained from the calcined target material. Based on the comparison between the yield and the expected yield of the calcined product, it obtains the target parameter values ​​of each process parameter, and then controls the operation of the rotary kiln according to the target parameter values. Therefore, this method can automatically obtain the target parameter values ​​of the operating parameters based on the difference between the yield and the expected yield, and control the operation of the rotary kiln according to the target parameter values. Compared to manual control of rotary kilns based on experience, this method improves the control efficiency of the rotary kiln. Furthermore, controlling the rotary kiln according to target parameter values ​​not only ensures that the difference between the yield of the calcined product and the expected yield is within a certain range, but also ensures that the sintering cycle of the target material is within the expected cycle range of the target material under that target parameter value. Therefore, it can effectively increase production capacity and reduce product energy consumption while ensuring the performance of the calcined product (i.e., calcination quality). In addition, it reduces reliance on manual labor, which can improve the control accuracy of the rotary kiln to a certain extent and simplify the operation for staff.

[0079] This application provides an electronic device that can be used to execute the rotary kiln control method provided in the above-described method embodiments. See also Figure 3 The electronic device 300 includes a processor 301. The processor 301 is used for: Based on the initial parameter values ​​of multiple process parameters of the rotary kiln, determine the initial value of the sintering cycle of the target material calcined in the rotary kiln. The multiple process parameters include at least two of the following: filling rate, rotation speed and tilt angle. Based on the initial value of the sintering cycle, the yield of calcined products obtained from calcining the target material is obtained. The yield is negatively correlated with the sintering cycle. Based on the comparison between the output and the expected output of the calcined product, the target parameter values ​​of each process parameter are obtained. The target parameter values ​​are obtained based on the initial parameter values. Controlling the operation of the rotary kiln according to the target parameter values ​​can ensure that the difference between the output of the calcined product and the expected output is within the range of the difference, and can ensure that the sintering cycle of the target material is within the expected cycle range of the target material under the target parameter values. Control the operation of the rotary kiln according to the target parameter values.

[0080] Optionally, the processor 301 can be used for: Obtain the particle size and density of the target material; Based on the particle size and density of the target material, a target period determination model that is compatible with the target material is obtained from multiple period determination models. Based on the target cycle determination model and the initial parameter values ​​of multiple process parameters of the rotary kiln, the initial value of the sintering cycle of the target material calcined in the rotary kiln is determined.

[0081] Optionally, the density includes: tapped density and loose packing density. The target material is a positive electrode material with a particle size greater than or equal to 10 micrometers and less than or equal to 13 micrometers. The tapped density of the target material is greater than or equal to 2.4 g / cm³ and less than or equal to 2.8 g / cm³, and the loose packing density of the target material is greater than or equal to 2.2 g / cm³ and less than or equal to 2.5 g / cm³. The target period determination model satisfies: ; T The sintering cycle of the target material. φ For fill rate, L The length of the rotary kiln body. n For rotational speed, α It is the angle of inclination.

[0082] Optionally, the output is the daily output, and the output P satisfies: ; Where ρ is the density of the target material, V is the volume of the rotary kiln, and φ is the filling rate.

[0083] Optionally, the processor 301 can be used for: If the comparison results indicate that the difference between the output and the expected output is within the range of the difference, then the initial parameter values ​​of each process parameter are determined as the target parameter values ​​of the process parameters. If the comparison result indicates that the difference between the output and the expected output is outside the range of the difference, then the initial parameter value of at least one process parameter is adjusted to obtain the target parameter value of each process parameter. Among them, the target parameter values ​​of each process parameter are within the range of the process parameter values.

[0084] Optionally, the processor 301 can be used for: First, adjust the initial parameter value of the rotation speed. If it is still not possible to make the difference between the output and the expected output within the range, then adjust the initial parameter value of the tilt angle and the initial parameter value of the filling rate.

[0085] Optionally, the processor 301 can be used for: If the output exceeds the expected output, reduce the initial value of at least one process parameter. If the output is less than the expected output, increase the initial value of at least one process parameter.

[0086] Optionally, the processor 301 can be used for: Based on the target parameter values ​​of multiple process parameters, the feed rate of the target material is obtained; Control the operation of the rotary kiln according to the target parameter values ​​and the feed rate.

[0087] Optionally, the processor 301 can be used for: Based on the target parameter values ​​of multiple process parameters, determine the target value of the sintering cycle; Based on the target value of the sintering cycle, the feed rate of the target material is obtained, and the feed rate is negatively correlated with the sintering cycle.

[0088] In summary, this application provides an electronic device that can determine the initial value of the sintering cycle of the target material calcined in the rotary kiln based on the initial parameter values ​​of multiple process parameters of the rotary kiln. Based on this initial value, it obtains the yield of the calcined product obtained from the calcined target material. Furthermore, based on a comparison between the yield and the expected yield of the calcined product, it obtains the target parameter values ​​for each process parameter, and then controls the operation of the rotary kiln according to the target parameter values. Therefore, this electronic device can automatically obtain the target parameter values ​​of the operating parameters based on the difference between the yield and the expected yield, and control the operation of the rotary kiln according to the target parameter values. Compared to manual control of rotary kilns based on experience, this method improves the control efficiency of the rotary kiln. Furthermore, controlling the rotary kiln according to target parameter values ​​not only ensures that the difference between the yield of the calcined product and the expected yield is within a certain range, but also ensures that the sintering cycle of the target material is within the expected cycle range of the target material under that target parameter value. Therefore, it can effectively increase production capacity and reduce product energy consumption while ensuring the performance of the calcined product (i.e., calcination quality). In addition, it reduces reliance on manual labor, which can improve the control accuracy of the rotary kiln to a certain extent and simplify the operation for staff.

[0089] like Figure 3 As shown, the electronic device 300 further includes a memory 303. The processor 301 and the memory 303 are connected, for example, via a bus 302. Optionally, the electronic device 300 may also include a transceiver 304. It should be noted that in practical applications, the transceiver 304 is not limited to one, and the structure of the electronic device 300 does not constitute a limitation on the embodiments of this application.

[0090] Processor 301 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 301 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0091] Bus 302 may include a pathway for transmitting information between the aforementioned components. Bus 302 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 302 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0092] The memory 303 stores a computer program corresponding to the rotary kiln control method provided in the above embodiments of this application. This computer program is executed by the processor 301. The processor 301 executes the computer program stored in the memory 303 to implement the content shown in the aforementioned method embodiments.

[0093] This application provides a computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the rotary kiln control method provided in the above-described method embodiments. For example, Figure 1 or Figure 2 The method shown.

[0094] This application provides a computer program product, which includes a computer program that, when executed by a processor, implements the rotary kiln control method provided in the above-described method embodiments. For example, Figure 1 or Figure 2 The method shown.

[0095] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0096] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0097] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0099] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0100] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A control method of a rotary kiln, characterized by, The method comprises: determining an initial value of a sintering period of a target material calcined by the rotary kiln based on initial parameter values of a plurality of process parameters of the rotary kiln, the plurality of process parameters comprising at least two of a filling rate, a rotating speed and an inclination angle; obtaining a yield of a calcined product of the target material based on the initial value of the sintering period, the yield being negatively correlated with the sintering period; obtaining target parameter values of the plurality of process parameters based on a comparison result of the yield and an expected yield of the calcined product, the target parameter values being obtained based on the initial parameter values, and the rotary kiln being controlled to operate according to the target parameter values so that a difference between the yield and the expected yield of the calcined product is within a difference range, and a period value of the sintering period of the target material is within an expected period range of the target material under the target parameter values; controlling the rotary kiln to operate according to the target parameter values.

2. The method of claim 1, wherein, The method comprises: obtaining a particle size and a density of the target material; obtaining a target period determination model suitable for the target material from a plurality of period determination models based on the particle size and the density; determining the initial value of the sintering period of the target material calcined by the rotary kiln based on the target period determination model and the initial parameter values of the plurality of process parameters of the rotary kiln.

3. The method of claim 2, wherein, The density comprises a tap density and a loose bulk density, the target material is a positive electrode material, the particle size of the target material is greater than or equal to 10 microns and less than or equal to 13 microns, the tap density of the target material is greater than or equal to 2.4 grams per cubic centimeter and less than or equal to 2.8 grams per cubic centimeter, and the loose bulk density of the target material is greater than or equal to 2.2 grams per cubic centimeter and less than or equal to 2.5 grams per cubic centimeter; the target period determination model satisfies: ； T for the sintering cycle of the target material, φ for the filling rate, L for the length of the kiln body of the rotary kiln, n for the rotational speed, α for the inclination angle.

4. The method according to any one of claims 1 to 3, characterized in that, The yield is daily yield, the yield P satisfies: ； wherein ρ is the density of the target material, V is the volume of the rotary kiln, φ is the fill rate.

5. The method according to any one of claims 1 to 3, characterized in that, The method comprises: if the comparison result indicates that the difference between the yield and the expected yield is within the difference range, determining the initial parameter values of the plurality of process parameters as the target parameter values of the plurality of process parameters; if the comparison result indicates that the difference between the yield and the expected yield is outside the difference range, adjusting the initial parameter values of at least one of the plurality of process parameters to obtain the target parameter values of the plurality of process parameters; wherein the target parameter values of the plurality of process parameters are within a parameter value range of the plurality of process parameters.

6. The method of claim 5, wherein, The method comprises: preferentially adjusting the initial parameter value of the rotating speed, adjusting the initial parameter value of the inclination angle if the difference between the yield and the expected yield still cannot be within the difference range, and finally adjusting the initial parameter value of the filling rate.

7. The method according to any one of claims 1 to 3, characterized in that, The method comprises: obtaining a feeding speed of the target material based on the target parameter values of the plurality of process parameters. According to the target parameter value and the feeding speed, the rotary kiln is controlled to operate.

8. The method of claim 7, wherein, Based on the target parameter values of the plurality of process parameters, a feeding speed of the target material is obtained, including: Based on the target parameter values of the plurality of process parameters, a target value of the sintering period is determined. Based on the target value of the sintering period, a feeding speed of the target material is obtained, and the feeding speed is negatively correlated with the sintering period.

9. An electronic device, comprising: The electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method according to any one of claims 1-8 when executing the computer program.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executable on the processor to implement the method according to any one of claims 1-8.

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