Microwave reactor control methods, apparatuses, devices, and storage media

Abstract

This invention discloses a microwave reactor control method, apparatus, equipment, and storage medium. The method includes: firstly, employing a variable frequency microwave reactor so that the microwave source's power and frequency are both adjustable; secondly, establishing a corresponding control mode to allow real-time adjustment of the microwave source's power and frequency according to the feeding conditions within the microwave reactor, thereby preventing undercooked materials or premature surface carbonization during heating. The three-dimensional electromagnetic field model in this invention can predict the temperature and stack radius of each temperature control zone. Thus, based on the stack radius, the appropriate microwave frequency for the microwave source in the temperature control zone is determined to allow microwaves to penetrate the feed within that zone. Then, the power of the microwave source is further adjusted to ensure the temperature in the temperature control zone meets the requirements. This invention effectively improves the processing efficiency of the microwave reactor.

Description

Technical Field

[0001] This invention relates to the field of chemical processes, and in particular to microwave reactor control methods, apparatus, equipment, and storage media. Background Technology

[0002] Biomass pyrolysis, generally speaking, refers to the process in which biomass is heated to a higher temperature in an anaerobic or low-oxygen environment, causing molecular decomposition to produce coke, condensable liquid and gaseous products. It is an important form of biomass energy utilization.

[0003] During the rapid pyrolysis of biomass, the biomass feedstock is rapidly heated to a high reaction temperature under oxygen-deficient conditions, which triggers the decomposition of macromolecules and produces small molecule gases, condensable volatiles, and a small amount of coke products.

[0004] Microwave heating is a common heating method for rapid biomass pyrolysis. Compared with other pyrolysis methods, it has the advantages of fast heating rate, short residence time and moderate pyrolysis temperature, and therefore has promising research and development prospects in the field of chemical applications.

[0005] The inventors discovered through research that the existing technology has at least the following defects:

[0006] The heating process is prone to uneven heating, which can lead to undercooked materials or premature carbonization of the surface, thus affecting the efficiency and effectiveness of microwave heating.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to avoid the phenomenon of "half-cooked" material or premature carbonization of the surface during the heating process of microwave reactors.

[0009] This invention provides a microwave reactor control method, comprising the following steps:

[0010] S11. Based on the modeling of the continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor.

[0011] S12. In the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into temperature control zones corresponding to each controllable microwave source, and a preset heating rate range is set for each temperature control zone.

[0012] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed.

[0013] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters; the simulation results include the predicted temperature value and the predicted material pile radius value of each temperature control zone after one time step.

[0014] S15. Calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius.

[0015] S16. Based on the predicted temperature value and the current temperature value of each temperature control zone, determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range. If yes, adjust the microwave power of the controllable microwave source that exceeds the preset heating rate range according to the preset rules, update the current microwave power using the adjusted microwave power of the controllable microwave source, and return to step S14. If no, generate a control command for the controllable microwave source based on the current microwave power and the predicted microwave frequency.

[0016] Preferably, in this invention, the control commands include:

[0017] The power control command and frequency control command of the controllable microwave source.

[0018] Preferably, in this invention, the preset heating rate range includes:

[0019] 0.5℃ / s–10℃ / s.

[0020] Preferably, in this invention, the step of generating a three-dimensional electromagnetic field model of the microwave reactor based on microwave reactor modeling and meshing the three-dimensional electromagnetic field model includes:

[0021] Let the internal volume of the microwave reactor be V; and the number of the controllable microwave sources be n.

[0022] Let the power of the i-th controllable microwave source be P. i The total power of the microwave reactor is

[0023] The meshed three-dimensional electromagnetic field model has d mesh elements and is stored in set D, where the dielectric constant of the i-th mesh element belonging to set D is ε′. i The dielectric loss is ε″ i The loss tangent is tanδ iThe temperature is T i The initial velocity is the feed rate v0, and the initial direction is the feed direction x.

[0024] Preferably, in this invention, the step of calculating the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the stockpile radius includes:

[0025] S21. For each temperature control zone, the current microwave frequency of the controllable microwave source is obtained according to the three-dimensional electromagnetic field model at the first time step when the material enters the temperature control zone.

[0026] S22. Traverse the grid cells in the temperature control zone and calculate the corresponding material stacking radius value h for each grid cell. i Then, the data is stored in the data set Queue. Finally, the data in the data set Queue is sorted in descending order of value. At the same time, a mapping sequence Map is established to store the dielectric constant and loss tangent values ​​of the corresponding grid cell identifiers in the Queue data set.

[0027] S23. Traverse the grid cells in the mapping sequence Map, read the data of dielectric constant and loss tangent, and calculate the penetration depth D of the controllable microwave source into the current grid cell. pi Then it is stored in the data collection Comp;

[0028] S24. Compare the values ​​in the data set Comp with those in the data set Queue. Determine whether all values ​​in the data set Comp are greater than those in the data set Queue. If not, reduce the microwave frequency of the controllable microwave source by a first preset ratio, and use the adjusted microwave frequency of the controllable frequency conversion microwave source as the current microwave frequency and return to step S23. If yes, use the current microwave frequency as the predicted microwave frequency.

[0029] Preferably, in this invention, the first preset ratio includes 0.5%–5%, more preferably 2%–3%.

[0030] Preferably, in this invention, the calculation of the penetration depth D of the controllable microwave source into the current grid cell is... pi ,include:

[0031] The penetration depth is calculated using the method proposed by Meredith, and the formula is as follows:

[0032]

[0033] Among them, D p λ is the microwave penetration depth, λ0 is the microwave wavelength, ε' is the dielectric constant of the material, and tanδ is the tangent of the material loss angle.

[0034] Preferably, in this invention, the step of determining whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range based on the predicted temperature value and the current temperature value of each temperature control zone, and adjusting the microwave power of the controllable microwave source that exceeds the preset heating rate range according to preset rules, includes:

[0035] S31. Based on the three-dimensional electromagnetic field model, obtain the current microwave power of the controllable frequency conversion microwave source and the material feeding rate v0 at the first time step when the material enters the temperature control zone.

[0036] S32. Set up a moving grid according to the feed rate v0, and calculate the actual rate v′ of each grid cell in the moving grid according to the three-dimensional electromagnetic field model. i ;

[0037] S33. Traverse the temperature points of the grid cells in the temperature control zone at the next time step t and calculate their relationship with the preset number of previous time steps t. i = The temperature difference at temperature point {f(t)}, if the maximum temperature difference exceeds the upper limit of the preset heating rate range, the grid cell identifier corresponding to the maximum temperature point and the temperature difference data set Temp1 are added; if the minimum temperature difference exceeds the lower limit of the preset heating rate range, the grid cell identifier corresponding to the minimum temperature point and the temperature difference data set Temp2 are added.

[0038] S34. Compare the number of elements in Temp1 and Temp2. ​​If the number of elements in Temp1 is greater than a preset multiple of Temp2, reduce the microwave power according to a second preset ratio. If the number of elements in Temp1 is less than the preset multiple of Temp2, increase the microwave power according to a third preset ratio.

[0039] Preferably, in this invention, the second preset ratio and the third preset ratio include:

[0040] 0.5%–3%.

[0041] Preferably, in this invention, the preset number of time steps includes:

[0042] 1–5.

[0043] Preferably, in this invention, the mesh comprises:

[0044] One or more of the following: tetrahedral mesh, hexahedral mesh, pyramidal mesh, wedge mesh, and polyhedral mesh.

[0045] In another aspect of the invention, a microwave reactor control device is also provided, comprising:

[0046] A modeling unit is used to model a continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor, and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor.

[0047] The partitioning unit is used to divide the inner cavity of the microwave reactor into temperature control zones corresponding to each controllable microwave source in the three-dimensional electromagnetic field model, and to set a preset heating rate range for each temperature control zone.

[0048] The parameter acquisition unit is used to acquire the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed.

[0049] The prediction unit is used to calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters with a preset time step as the calculation period; the simulation results include the predicted temperature value and the predicted value of the stockpile radius of each temperature control zone after one time step.

[0050] The frequency calculation unit is used to calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius.

[0051] The instruction generation unit is used to determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range based on the predicted temperature value and the current temperature value of each temperature control zone. If so, the microwave power of the controllable microwave source that exceeds the preset heating rate range is adjusted according to preset rules, the adjusted microwave power of the controllable microwave source is used to update the current microwave power and the result is returned to the prediction unit. If not, a control instruction for the controllable microwave source is generated based on the current microwave power and the predicted microwave frequency.

[0052] In another aspect of this invention, a microwave storage reactor control device is also provided, comprising:

[0053] Memory, used to store computer programs;

[0054] A processor is used to invoke and execute the computer program to implement the various steps of the microwave reactor control method as described in any of the preceding claims.

[0055] In another aspect of the present invention, a storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the various steps of the microwave reactor control method as described in any of the preceding claims.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] Through research, the inventors discovered that the existing technology, which relies on adjusting the microwave power of the microwave source in the microwave reactor, results in uneven heating of the material because the microwaves cannot penetrate the material. Consequently, the material may be undercooked or the surface may carbonize prematurely during the heating process in the microwave reactor.

[0058] Based on the above findings, this invention first employs a variable frequency microwave reactor so that the microwave source of the microwave reactor is not only adjustable in power but also in frequency. Furthermore, this invention also sets up a corresponding control method so that the power and frequency of the microwave source can be adjusted in real time according to the feeding conditions in the microwave reactor, thereby avoiding the phenomenon of "half-cooked" material or premature carbonization of the surface during the heating process.

[0059] In this invention, the three-dimensional electromagnetic field model generated based on the microwave reactor model can not only predict the temperature of each temperature control zone, but also the predicted value of the material pile radius. Thus, the microwave frequency adapted to the microwave source in the temperature control zone is first determined based on the material pile radius to enable the microwave to penetrate the feed in the temperature control zone, and then the power of the microwave source is further adjusted to ensure that the temperature of the temperature control zone meets the requirements.

[0060] As can be seen from the above, the present invention can effectively control the temperature of each temperature control zone during the heating process of the microwave reactor, while also avoiding the phenomenon of "half-cooked" material or premature carbonization of the surface, thereby effectively improving the processing effect of the microwave reactor.

[0061] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other objects, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. Attached Figure Description

[0062] Figure 1 This is a flowchart illustrating the steps of the microwave reactor control method described in this invention;

[0063] Figure 2 This is a schematic diagram of the structure of the microwave reactor control device described in this invention;

[0064] Figure 3 This is a schematic diagram of the structure of the microwave reactor control device described in this invention. Detailed Implementation

[0065] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0066] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0067] In this document, for ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “above,” “upper,” etc., are used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that spatial relative terms are intended to encompass different orientations of an object in use or operation, in addition to those depicted in the figures. For example, if an object in the figure is flipped, an element described as “below” or “under” another element or feature would be oriented “above” that element or feature. Thus, the exemplary term “below” can encompass both the downward and upward orientations. An object may also have other orientations (rotated 90 degrees or other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0068] In this document, the terms "first," "second," etc., are used to distinguish two different elements or parts, and are not used to define specific positions or relative relationships. In other words, in some embodiments, the terms "first," "second," etc., can also be used interchangeably.

[0069] Example 1

[0070] To avoid the phenomenon of "undercooked" materials or premature carbonization of the surface, and thus effectively improve the processing effect of microwave reactors, such as... Figure 1 As shown, an embodiment of the present invention provides a microwave reactor control method, including the following steps:

[0071] S11. Based on the modeling of the continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor.

[0072] This invention utilizes three-dimensional electromagnetic field simulation technology to simulate the temperature distribution data within the cavity of a microwave reactor. Since the power and frequency of the controllable microwave source need to be adjusted in this invention, the microwave reactor should be a frequency conversion microwave reactor.

[0073] In practical applications, the specific methods for meshing a three-dimensional electromagnetic field model can be as follows:

[0074] Let the internal volume of the microwave reactor be V; and the number of the controllable microwave sources be n.

[0075] Let the power of the i-th controllable microwave source be P. i The total power of the microwave reactor is

[0076] The meshed three-dimensional electromagnetic field model has d mesh elements and is stored in set D, where the dielectric constant of the i-th mesh element belonging to set D is ε′. i The dielectric loss is ε″ i The loss tangent is tanδ i The temperature is T i The initial velocity is the feed rate v0, and the initial direction is the feed direction x.

[0077] It should be noted that the microwave reactor in this embodiment of the invention is a continuously fed microwave reactor. The material to be heated continuously passes through the cavity of the microwave reactor from the feed port and exits from the discharge port. The microwave reactor heats the material in the cavity through multiple controllable microwave sources.

[0078] In practical applications, the mesh of the three-dimensional electromagnetic field model in this embodiment of the invention can be one or more of tetrahedral meshes, hexahedral meshes, pyramidal meshes, wedge meshes, and polyhedral meshes.

[0079] S12. In the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into temperature control zones corresponding to each controllable microwave source, and a preset heating rate range is set for each temperature control zone.

[0080] In this embodiment of the invention, the inner cavity of the microwave reactor is divided into multiple temperature control zones, and the number of temperature control zones corresponds to the controllable microwave source of the microwave reactor, that is, each controllable microwave source corresponds to one temperature control zone.

[0081] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed.

[0082] Before simulating the temperature distribution inside the microwave reactor cavity, it is necessary to generate various input parameters for the three-dimensional electromagnetic field model. Specifically, the input parameters may include the current microwave power, current microwave frequency, and current stack radius of each controllable microwave source in the microwave reactor, as well as the dielectric constant, loss tangent, feed direction, and feed rate of the heated feed.

[0083] The inventors discovered through research that the reason why the material is "half-cooked" or the surface is prematurely carbonized during the heating process of the microwave reactor is because microwaves cannot penetrate the material pile, resulting in uneven heating of the material pile.

[0084] Based on the above findings, in this embodiment of the invention, a variable frequency microwave reactor is first used so that the controllable microwave source of the microwave reactor is not only adjustable in power but also in frequency. Then, the invention also sets a corresponding control method so that the power and frequency of the microwave source can be adjusted in real time according to the feeding conditions in the microwave reactor, thereby avoiding the phenomenon of "half-cooked" material or premature carbonization of the surface during the heating process.

[0085] In order to achieve appropriate control of the controllable microwave sources in the variable frequency microwave reactor, the input parameters of the three-dimensional electromagnetic field model in this embodiment of the invention include, in addition to the microwave power of each controllable microwave source, the microwave frequency of each controllable microwave source, the current stack radius value of each temperature control zone, and the dielectric constant, loss tangent, feed direction and feed rate of the heated feed.

[0086] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters; the simulation results include the predicted temperature value and the predicted material pile radius value of each temperature control zone after one time step.

[0087] In this embodiment of the invention, the simulation results of the three-dimensional electromagnetic field model calculated based on the input parameters are periodic, that is, a calculation is performed every time step. In practical applications, the value of the time step can be determined based on the actual computing power of the computer and the experience of those skilled in the art, and no specific limitation is made here.

[0088] In this embodiment of the invention, the purpose of calculating the simulation results of the three-dimensional electromagnetic field model based on the input parameters is to obtain the predicted temperature and material radius of each temperature control zone at the next time step at the current time step, that is, to predict the predicted temperature and material radius of each temperature control zone.

[0089] In practical applications, measurement devices such as infrared sensors can be used to obtain real-time data on the material pile radius inside a physical microwave reactor. Then, a three-dimensional electromagnetic field model can be used to obtain the predicted value of the material pile radius of each temperature control zone at the next time step.

[0090] S15. Calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius.

[0091] The penetration depth of a microwave source into a material pile is related to the microwave frequency of the source, the dielectric constant of the material pile, and the loss tangent. In other words, based on the predicted radius of the material pile corresponding to each temperature control zone, the microwave frequency for each controllable microwave source to penetrate the corresponding material pile in the next long-term adaptation phase can be calculated using a three-dimensional electromagnetic field model. The specific steps are as follows:

[0092] S21. For each temperature control zone, the current microwave frequency of the controllable microwave source is obtained according to the three-dimensional electromagnetic field model at the first time step when the material enters the temperature control zone.

[0093] S22. Traverse the grid cells in the temperature control zone and calculate the corresponding material stacking radius value h for each grid cell. i Then, the data is stored in the data set Queue. Finally, the data in the data set Queue is sorted in descending order of value. At the same time, a mapping sequence Map is established to store the dielectric constant and loss tangent values ​​of the corresponding grid cell identifiers in the Queue data set.

[0094] S23. Traverse the grid cells in the mapping sequence Map, read the data of dielectric constant and loss tangent, and calculate the penetration depth D of the controllable microwave source into the current grid cell. pi Then it is stored in the data collection Comp;

[0095] The calculated penetration depth D of the controllable microwave source into the current grid cell is... pi ,include:

[0096] The penetration depth is calculated using the method proposed by Meredith, and the formula is as follows:

[0097]

[0098] Among them, D p λ is the microwave penetration depth, λ0 is the microwave wavelength, ε' is the dielectric constant of the material, and tanδ is the tangent of the material loss angle.

[0099] S24. Compare the values ​​in the data set Comp with those in the data set Queue. Determine whether all values ​​in the data set Comp are greater than those in the data set Queue. If not, reduce the microwave frequency of the controllable microwave source by a first preset ratio, and use the adjusted microwave frequency of the controllable frequency conversion microwave source as the current microwave frequency and return to step S23. If yes, use the current microwave frequency as the predicted microwave frequency.

[0100] In practical applications, the first preset ratio used to gradually adjust the frequency of the controllable frequency-converting microwave source can be selected from 0.5% to 5%, and more preferably from 2% to 3%.

[0101] S16. Based on the predicted temperature value and the current temperature value of each temperature control zone, determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range. If yes, adjust the microwave power of the controllable microwave source that exceeds the preset heating rate range according to the preset rules, update the current microwave power using the adjusted microwave power of the controllable microwave source, and return to step S14. If no, generate a control command for the controllable microwave source based on the current microwave power and the predicted microwave frequency.

[0102] In this embodiment of the invention, it is necessary to control the heating rate of the material during the heating process. That is, the material needs to maintain a set heating trend during the heating process. Therefore, it is necessary to set a reasonable heating rate range between two adjacent temperature control zones (i.e., a preset heating rate range), or a preset heating rate range between two steps for the same position of the material, to ensure that the material maintains the set heating trend during the heating process.

[0103] In practical applications, based on the time interval of a preset number of time steps, the preset heating rate for the same temperature control zone can be set between 5% and 10%.

[0104] In this embodiment of the invention, it is necessary to determine, at the next time step, whether each temperature control zone includes grid cells exceeding the preset heating rate. In practical applications, determining whether each temperature control zone includes grid cells exceeding the preset heating rate and adjusting the microwave power of the controllable microwave source can be done in parallel or sequentially. Specifically, based on the predicted temperature value and the current temperature value of each temperature control zone, it is determined whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range. If so, the microwave power of the controllable microwave source exceeding the preset heating rate range is adjusted according to a preset rule. This can specifically include:

[0105] S31. Based on the three-dimensional electromagnetic field model, obtain the current microwave power of the controllable frequency conversion microwave source and the material feeding rate v0 at the first time step when the material enters the temperature control zone.

[0106] S32. Set up a moving grid according to the feed rate v0, and calculate the actual rate v′ of each grid cell in the moving grid according to the three-dimensional electromagnetic field model. i ;

[0107] In this invention, the calculation of the actual rate v′ of each grid cell is described as follows: i The calculation equations for time can include:

[0108] The velocity vector field V is described as satisfying the Navier-Stokes equations (NS equations for short):

[0109] Where V is the velocity vector, t is time, g is the external force (gravity) acting on the fluid, μ is the dynamic viscosity, ρ is the fluid density, and p is the pressure.

[0110] S33. Traverse the temperature points of the grid cells in the temperature control zone at the next time step t and calculate their relationship with the temperature points t at the previous time steps a preset number of times. i = {f(t)} temperature difference, if the maximum temperature difference exceeds the upper limit of the preset heating rate range, the grid cell identifier corresponding to the maximum temperature point and the temperature difference data set Temp1 are added; if the minimum temperature difference exceeds the lower limit of the preset heating rate range, the grid cell identifier corresponding to the minimum temperature point and the temperature difference data set Temp2 are added.

[0111] To prevent the problem of insufficient material heating rate, in this embodiment of the invention, it is also necessary to determine whether the temperature control zone includes grid cells that exceed the upper limit of the preset heating rate range, and to determine which grid cells are below the lower limit of the preset heating rate range. This embodiment of the invention adopts a traversal method to determine the maximum heating point of the grid cells in the temperature control zone. When the maximum heating point exceeds the upper limit of the preset heating rate range, the corresponding grid cell identifier and temperature difference data set Temp1 are added. Then, the same judgment is performed on the remaining grid cells, thereby selecting all grid cells that exceed the upper limit of the preset heating rate range, which means selecting all grid cells that exceed the upper limit of the preset heating rate range within a preset number of time steps.

[0112] In practical applications, the preset number of time steps in the embodiments of the present invention can range from 1 to 5, preferably 3.

[0113] Similar to selecting all grid cells that exceed the upper limit of the preset heating rate range in the next time step, this embodiment of the invention also selects all grid cells that are below the lower limit of the preset heating rate range within a preset number of time steps, and adds the grid cell identifier corresponding to the minimum temperature point to the temperature difference data set Temp2.

[0114] S34. Compare the number of elements in Temp1 and Temp2. ​​If the number of elements in Temp1 is greater than a preset multiple of Temp2, reduce the microwave power according to a second preset ratio. If the number of elements in Temp1 is less than the preset multiple of Temp2, increase the microwave power according to a third preset ratio.

[0115] In practical applications, the preset multiplier can preferably be set to 10 times. The second and third preset ratios used to adjust the microwave power can specifically be between 0.5% and 3%.

[0116] In practical applications, step S33 can be to compare the temperature difference between the temperature point in the next time step t and the temperature difference of each time step within the previous preset number of time steps. The maximum temperature difference can be selected from the maximum values ​​of the previous 1-5 time steps. Furthermore, the preferred number can be 3.

[0117] In practical applications, step S34 is used to compare the temperature point in the next time step t with the temperature difference of the previous time step. The minimum temperature difference can be selected from the maximum value of the previous 1-5 time steps. Furthermore, the preferred number can be 3.

[0118] In summary, in this embodiment of the invention, a variable frequency microwave reactor is first used so that the microwave source of the microwave reactor is not only adjustable in power but also in frequency. Next, this embodiment of the invention also sets a corresponding control method so that the power and frequency of the microwave source can be adjusted in real time according to the feeding conditions in the microwave reactor, thereby avoiding the phenomenon of "half-cooked" material or premature carbonization of the surface during the heating process.

[0119] In this embodiment of the invention, the three-dimensional electromagnetic field model generated based on the microwave reactor model can not only predict the temperature of each temperature control zone, but also the predicted value of the material pile radius. Thus, the microwave frequency adapted to the microwave source in the temperature control zone is first determined based on the material pile radius so that the microwave can penetrate the feed in the temperature control zone, and then the power of the microwave source is further adjusted so that the temperature of the temperature control zone can meet the requirements.

[0120] As can be seen from the above, the embodiments of the present invention can effectively control the temperature of each temperature control zone during the heating process of the microwave reactor, while also avoiding the phenomenon of "half-cooked" material or premature carbonization of the surface, thereby effectively improving the processing effect of the microwave reactor.

[0121] Example 2

[0122] In another aspect of the present invention, a microwave storage reactor control device is also provided. Figure 2 This diagram illustrates the structure of a microwave storage reactor control device provided in an embodiment of the present invention. The microwave storage reactor control device is... Figure 1 The device corresponding to the microwave reactor control method described in the corresponding embodiment is implemented through a virtual device. Figure 1 In the corresponding embodiment of the microwave storage reactor control method, the various virtual modules constituting the microwave storage reactor control device can be executed by electronic devices, such as network devices, terminal devices, or servers. The microwave storage reactor control device in this embodiment can realize the control of microwave storage reactors required for industrial control. Specifically, the microwave storage reactor control device in this embodiment includes:

[0123] Modeling unit 01 is used to model a continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor, and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor.

[0124] Partitioning unit 02 is used to divide the inner cavity of the microwave reactor into temperature control zones corresponding to each controllable microwave source in the three-dimensional electromagnetic field model, and to set a preset heating rate range for each temperature control zone.

[0125] The parameter acquisition unit 03 is used to acquire the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed.

[0126] Prediction unit 04 is used to calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters with a preset time step as the calculation period; the simulation results include the predicted temperature value and the predicted material pile radius value of each temperature control zone after one time step;

[0127] Frequency calculation unit 05 is used to calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius.

[0128] The instruction generation unit 06 is used to determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range based on the predicted temperature value and the current temperature value of each temperature control zone. If so, the microwave power of the controllable microwave source that exceeds the preset heating rate range is adjusted according to a preset rule, the adjusted microwave power of the controllable microwave source is used to update the current microwave power and the result is returned to the prediction unit. If not, a control instruction for the controllable microwave source is generated based on the current microwave power and the predicted microwave frequency.

[0129] Since the working principle and beneficial effects of the microwave reactor control device in the embodiments of the present invention have already been demonstrated, Figure 1 The corresponding microwave reactor control methods are also described and explained, so they can be referenced together, and will not be repeated here.

[0130] Example 3

[0131] Corresponding to the above method embodiments, this application also provides a microwave reactor control device, such as a terminal and a server. The server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The terminal can be a smartphone, tablet, laptop, desktop computer, etc., but is not limited to these.

[0132] Example diagram of the hardware structure block diagram of the microwave storage reactor control device provided in the embodiments of the present invention is shown below. Figure 3 As shown, it may include:

[0133] Processor 1, communication interface 2, memory 3, and communication bus 4;

[0134] The processor 1, communication interface 2, and memory 3 communicate with each other via communication bus 4.

[0135] Optionally, communication interface 2 can be an interface of a communication module, such as the interface of a GSM module;

[0136] Processor 1 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.

[0137] Memory 3 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0138] Specifically, processor 1 is used to execute the computer program stored in memory 3 to perform the following steps:

[0139] S11. Based on the modeling of the continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor.

[0140] S12. In the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into temperature control zones corresponding to each controllable microwave source, and a preset heating rate range is set for each temperature control zone.

[0141] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed.

[0142] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters; the simulation results include the predicted temperature value and the predicted material pile radius value of each temperature control zone after one time step.

[0143] S15. Calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius.

[0144] S16. Based on the predicted temperature value and the current temperature value of each temperature control zone, determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range. If yes, adjust the microwave power of the controllable microwave source that exceeds the preset heating rate range according to the preset rules, update the current microwave power using the adjusted microwave power of the controllable microwave source, and return to step S14. If no, generate a control command for the controllable microwave source based on the current microwave power and the predicted microwave frequency.

[0145] The microwave storage reactor control device in this embodiment of the invention, when the program instructions included in its computer program product are executed by a computer, can enable the computer to execute the microwave storage reactor control method described in the above aspects and achieve the same technical effect.

[0146] Example 4

[0147] In this embodiment of the invention, a storage medium is also provided, which can store a program suitable for execution by a processor, the program being used for:

[0148] S11. Based on the modeling of the continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor.

[0149] S12. In the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into temperature control zones corresponding to each controllable microwave source, and a preset heating rate range is set for each temperature control zone.

[0150] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed.

[0151] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters; the simulation results include the predicted temperature value and the predicted material pile radius value of each temperature control zone after one time step.

[0152] S15. Calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius.

[0153] S16. Based on the predicted temperature value and the current temperature value of each temperature control zone, determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range. If yes, adjust the microwave power of the controllable microwave source that exceeds the preset heating rate range according to the preset rules, update the current microwave power using the adjusted microwave power of the controllable microwave source, and return to step S14. If no, generate a control command for the controllable microwave source based on the current microwave power and the predicted microwave frequency.

[0154] Optionally, the refined and extended functions of the program can be found in the description above.

[0155] The above-described product can execute the methods provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the methods. Technical details not described in detail in this embodiment can be found in the methods provided in other embodiments of the present invention.

[0156] The above-described product can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in the method provided in the embodiments of the present invention.

[0157] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0158] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. Furthermore, the couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0159] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0160] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0161] It should be understood that in the embodiments of this application, the claims, various embodiments, and features can be combined with each other to solve the aforementioned technical problems.

[0162] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0163] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of microwave reactor control, characterized by, Including the following steps: S11. Based on the modeling of the continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor. S12. In the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into temperature control zones corresponding to each controllable microwave source, and a preset heating rate range is set for each temperature control zone. S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed. S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters; the simulation results include the predicted temperature value and the predicted material pile radius value of each temperature control zone after one time step. S15. Calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius. S16. Based on the predicted temperature value and the current temperature value of each temperature control zone, determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range. If yes, adjust the microwave power of the controllable microwave source that exceeds the preset heating rate range according to preset rules, update the current microwave power using the adjusted microwave power of the controllable microwave source, and return to step S14. If no, generate a control command for the controllable microwave source based on the current microwave power and the predicted microwave frequency. The control command includes a power control command and a frequency control command for the controllable microwave source. Based on the microwave reactor modeling, a three-dimensional electromagnetic field model of the microwave reactor is generated and meshed, including: Let the internal volume of the microwave reactor be V; and the number of the controllable microwave sources be n. Let the power of the i-th controllable microwave source be P i , and the total power of the microwave reactor be ; The meshed three-dimensional electromagnetic field model has d grid cells and is stored in a set D, wherein the dielectric constant of the i-th grid cell belonging to the set D is , the dielectric loss is , the loss tangent value is tan , and the temperature is T i， The initial rate is the feed rate , and the initial direction is the feed direction x; The step of calculating the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the stockpile radius includes: S21. For each temperature control zone, the current microwave frequency of the controllable microwave source is obtained according to the three-dimensional electromagnetic field model at the first time step when the material enters the temperature control zone. S22, traversing the grid cells in the temperature control area, calculating the corresponding pile-up radius value h of each grid cell i After that, the data is stored in the data set Queue, and finally the data in the data set Queue is sorted in descending order of numerical value, and a mapping sequence Map is established to store the dielectric constant and loss tangent value data corresponding to the grid cell identifier in the Queue data set; S23, traversing the grid cells in the mapping sequence Map, reading the data of dielectric constant and loss tangent value, and calculating the penetration depth D of the controllable microwave source to the current grid cell pi , and then storing it in the data set Comp; S24. Compare the values ​​in the data set Comp with those in the data set Queue, and determine whether all values ​​in the data set Comp are greater than those in the data set Queue. If not, reduce the microwave frequency of the controllable microwave source by a first preset ratio, and use the adjusted microwave frequency of the controllable microwave source as the current microwave frequency and return to step S23. If yes, use the current microwave frequency as the predicted microwave frequency. The step of determining whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range based on the predicted temperature value and the current temperature value of each temperature control zone, and adjusting the microwave power of the controllable microwave source that exceeds the preset heating rate range according to preset rules, includes: S31, obtaining, according to the three-dimensional electromagnetic field model, a current microwave power of the controllable microwave source and a feeding rate of the material when the material enters the temperature control zone at a first time step ; S32、according to the feed rate Setting a dynamic grid, and calculating the actual speed of each grid unit in the dynamic grid according to the three-dimensional electromagnetic field model ; S33. Traverse the temperature points of the grid cells in the temperature control zone at the next time step t and calculate their relationship with the preset number of previous time steps t. i ={ f If the maximum temperature difference exceeds the upper limit of the preset heating rate range, the grid cell identifier corresponding to the maximum temperature point and the temperature difference data set Temp1 are added; if the minimum temperature difference exceeds the lower limit of the preset heating rate range, the grid cell identifier corresponding to the minimum temperature point and the temperature difference data set Temp2 are added. S34. Compare the number of elements in Temp1 and Temp2. ​​If the number of elements in Temp1 is greater than a preset multiple of Temp2, reduce the microwave power according to a second preset ratio. If the number of elements in Temp1 is less than the preset multiple of Temp2, increase the microwave power according to a third preset ratio.

2. The microwave reactor control method of claim 1, wherein, The preset heating rate range includes: 0.5℃ / s–10℃ / s.

3. The microwave reactor control method of claim 1, wherein, The first preset ratio includes: 0.5% – 5 %。 4. The microwave reactor control method of claim 1, wherein, The first preset ratio includes: 2% – 3%。 5. The microwave reactor control method of claim 1, wherein, calculating a penetration depth D of the controllable microwave source into a current grid cell pi comprising: The penetration depth is calculated using the method proposed by Meredith, and the formula is as follows: ； wherein, D p is the depth of microwave penetration, λ 0 For microwave wavelengths, ε' is the dielectric constant of the material, tan δ is the loss tangent of the material.

6. The microwave reactor control method of claim 1, wherein, The second preset ratio and the third preset ratio include: 0.5 %– 3%。 7. The microwave reactor control method of claim 1, wherein, The preset number of time steps includes: 1–5.

8. The microwave reactor control method as claimed in claim 1, wherein, The grid includes: One or more of the following: tetrahedral mesh, hexahedral mesh, pyramidal mesh, and wedge mesh.

9. A microwave reactor control device, characterized by, For implementing the microwave reactor control method as described in any one of claims 1 to 8; comprising: A modeling unit is used to model a continuously fed microwave reactor, generate a three-dimensional electromagnetic field model of the microwave reactor, and mesh the three-dimensional electromagnetic field model; the microwave reactor is a frequency conversion microwave reactor. The partitioning unit is used to divide the inner cavity of the microwave reactor into temperature control zones corresponding to each controllable microwave source in the three-dimensional electromagnetic field model, and to set a preset heating rate range for each temperature control zone. The parameter acquisition unit is used to acquire the input parameters of the three-dimensional electromagnetic field model, including: the current microwave power, current microwave frequency and current stacking radius of each controllable microwave source in the microwave reactor and each temperature control zone, as well as the dielectric constant, loss tangent, feeding direction and feeding rate of the heated feed. The prediction unit is used to calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters with a preset time step as the calculation period; the simulation results include the predicted temperature value and the predicted value of the stockpile radius of each temperature control zone after one time step. The frequency calculation unit is used to calculate the predicted microwave frequency of the controllable microwave source corresponding to each temperature control zone based on the predicted value of the material pile radius. The instruction generation unit is used to determine whether the heating rate of each temperature control zone exceeds the corresponding preset heating rate range based on the predicted temperature value and the current temperature value of each temperature control zone. If so, the microwave power of the controllable microwave source that exceeds the preset heating rate range is adjusted according to preset rules, the adjusted microwave power of the controllable microwave source is used to update the current microwave power and the result is returned to the prediction unit. If not, a control instruction for the controllable microwave source is generated based on the current microwave power and the predicted microwave frequency.

10. A microwave reactor control device, comprising: Memory, used to store computer programs; A processor is configured to invoke and execute the computer program to implement the various steps of the microwave reactor control method as described in any one of claims 1-8.

11. A storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the microwave reactor control method as described in any one of claims 1-8.

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