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

Abstract

The application discloses a microwave cracking reactor control method, device, equipment and storage medium, the method comprises the steps that a three-dimensional electromagnetic field model is generated and gridded according to microwave cracking reactor modeling; the reaction cavity comprises a microwave reaction sub-cavity, a microwave absorption sub-cavity and a microwave transition sub-cavity; the temperature prediction value and the electromagnetic field intensity prediction value of each sub-cavity after a time step are obtained by calculation according to input parameters; the predicted dielectric properties of the wave-absorbing coating are calculated according to the temperature prediction value; then the predicted electromagnetic field intensity value in the microwave transition sub-cavity is further calculated; whether the microwave transition sub-cavity includes an over-standard grid exceeding the preset safety threshold is judged according to the predicted electromagnetic field intensity value, and the power adjustment instruction of the controllable microwave source is generated according to the judgment result; when the microwave cutoff rate at the next time step is predicted to be substandard, the microwave power of the controllable microwave source is adjusted in advance to assist in adjusting the process condition, and the economic efficiency of the process is ensured.

Description

Technical Field

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

[0002] Microwave cutoff waveguides are a necessary and frequently used technique in the field of microwave heating technology. For example, in the microwave pyrolysis and gasification process of biomass, tar is often generated. Therefore, the product gas obtained after microwave pyrolysis requires secondary tar removal treatment with combustion-supporting gases such as oxygen. If this type of gas comes into contact with microwaves at high temperatures, it is highly likely to cause flash explosions, "ignition," and other phenomena that endanger safe production. To avoid these phenomena, it is necessary to shield the microwaves in subsequent processes using microwave cutoff waveguides, or weaken the electromagnetic field strength to a safe range.

[0003] In existing technologies, chemical engineering typically employs two methods to prevent electromagnetic waves from entering a work area, namely, cutoff waveguides or absorbing coatings, to prevent electromagnetic radiation interference and ensure production process and personal safety.

[0004] The inventors discovered through research that the existing microwave absorbing coating methods have at least the following drawbacks:

[0005] Its dielectric properties fluctuate significantly with temperature and microwave frequency, resulting in unstable microwave absorption performance. This can lead to the control system using extremely low power and extremely low feed rate, or the operating conditions being kept in extreme conditions for a long time in order to maintain the high microwave absorption performance of the microwave absorbing coating, thereby affecting the economic efficiency of the process.

[0006] The information disclosed in the background section is intended only to enhance the understanding of the overall background of the present 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

[0007] The purpose of this invention is to improve the process control effect of microwave pyrolysis reactors.

[0008] This invention provides a method for controlling a microwave pyrolysis reactor, wherein the microwave absorbing coating is used in the microwave pyrolysis reactor, comprising the following steps:

[0009] S11. A three-dimensional electromagnetic field model is generated and meshed based on the microwave pyrolysis reactor model; the reaction chamber of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity; a controllable microwave source is located in the microwave reaction sub-cavity;

[0010] S12. Obtain the input parameters of the three-dimensional electromagnetic field model; the input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, and the mathematical model of the dielectric properties of the absorbing coating with frequency and temperature.

[0011] S13. 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 and electromagnetic field strength of each sub-cavity after one time step.

[0012] S14. Calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorber cavity based on the predicted temperature value and the input parameters.

[0013] S15. Calculate the predicted electromagnetic field strength correction value in the microwave transition sub-cavity based on the predicted electromagnetic field strength estimate and the predicted dielectric properties of each sub-cavity.

[0014] S16. Based on the predicted electromagnetic field strength correction value, determine whether the microwave transition subcavity includes an out-of-standard grid exceeding the preset safety threshold after one time step. If yes, reduce the current microwave power of the controllable microwave source corresponding to the out-of-standard grid according to the first preset rule and return to step S13; if no, generate a microwave power adjustment command for the controllable microwave source corresponding to the out-of-standard grid with the current microwave power as the target microwave power.

[0015] Preferably, in this embodiment of the invention, it further includes:

[0016] S17. Calculate the predicted overall microwave power of the microwave absorbing sub-cavity in the next time step based on the target microwave power;

[0017] S18. Calculate the current temperature field distribution of the microwave absorbing sub-cavity and determine whether the predicted overall microwave power is the same as the current overall microwave power of the microwave absorbing sub-cavity. If yes, increase the current material feeding rate according to the second preset rule. If no, calculate the dielectric properties of the microwave absorbing coating based on the current temperature field distribution of the microwave absorbing sub-cavity using the three-dimensional electromagnetic field model as the predicted dielectric properties and return to step S15.

[0018] Preferably, in this embodiment of the invention, it further includes:

[0019] S19. If, at the current material feed rate, the predicted temperature distribution at the microwave reactor outlet still does not meet the preset target temperature range after a preset number of calculation cycles, the material feed rate is adjusted to the value where the outlet temperature distribution met the predicted target temperature range before the last update.

[0020] S20. If, under the current controllable microwave power, the predicted temperature distribution at the outlet of the microwave reaction sub-cavity still does not meet the preset target temperature range after a preset number of calculation cycles, the material feed rate is adjusted to the value at the outlet before the last update, which satisfies the predicted target temperature range.

[0021] In another aspect of the invention, a microwave pyrolysis reactor control device is also provided, wherein the microwave pyrolysis reactor is provided with a microwave absorbing coating, comprising:

[0022] The model building unit is used to generate a three-dimensional electromagnetic field model and mesh it based on the microwave pyrolysis reactor; the reaction cavity of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity; a controllable microwave source is located in the microwave reaction sub-cavity;

[0023] The parameter acquisition unit is used to acquire the input parameters of the three-dimensional electromagnetic field model. The input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, and a mathematical model of the dielectric properties of the absorbing coating with respect to frequency and temperature.

[0024] The model calculation unit is used to calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters with a preset time step as the calculation period. The simulation results include the predicted temperature and electromagnetic field strength of each sub-cavity after one time step.

[0025] The dielectric property calculation unit is used to calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorber cavity based on the predicted temperature value and the input parameters.

[0026] An electromagnetic field strength calculation unit is used to calculate the predicted electromagnetic field strength value in the microwave transition sub-cavity based on the predicted electromagnetic field strength value and the predicted dielectric properties of each sub-cavity.

[0027] The power adjustment command unit is used to determine whether the microwave transition subcavity contains an out-of-standard grid exceeding a preset safety threshold after one time step based on the predicted electromagnetic field strength correction value. If so, the current microwave power of the controllable microwave source corresponding to the out-of-standard grid is reduced according to the first preset rule and returned to the model calculation unit; if not, a microwave power adjustment command for the controllable microwave source corresponding to the out-of-standard grid is generated with the current microwave power as the target microwave power.

[0028] Preferably, in this embodiment of the invention, it further includes:

[0029] A power calculation unit is used to calculate the predicted overall microwave power of the microwave absorbing sub-cavity in the next time step based on the target microwave power.

[0030] The feed rate adjustment unit is used to calculate the current temperature field distribution of the microwave absorbing sub-cavity and determine whether the predicted overall microwave power is the same as the current overall microwave power of the microwave absorbing sub-cavity. If so, the current material feed rate is increased according to the second preset rule. If not, the dielectric properties of the microwave absorbing coating are calculated based on the current temperature field distribution of the microwave absorbing sub-cavity using the three-dimensional electromagnetic field model as the predicted dielectric properties and returned to the dielectric properties calculation unit.

[0031] In another aspect of the present invention, a microwave pyrolysis reactor control device is also provided, comprising:

[0032] Memory, used to store computer programs;

[0033] A processor is used to invoke and execute the computer program to implement the various steps of the microwave pyrolysis reactor control method as described in any of the preceding claims.

[0034] 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 pyrolysis reactor control method as described in any of the preceding claims.

[0035] The microwave pyrolysis reactor control device includes a computer program stored on a medium. The computer program includes program instructions. When the program instructions are executed by the computer, the computer performs the methods described in the above aspects and achieves the same technical effect.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] In this invention, the temperature and electromagnetic field strength of each cavity in the reactor can be predicted from the three-dimensional electromagnetic field model generated based on the microwave reactor model, thereby obtaining the predicted dielectric properties of the microwave absorbing coating. Thus, the actual microwave shielding effect of the microwave absorbing coating within the reactor can be obtained based on the predicted values.

[0038] The purpose of setting up a microwave transition sub-cavity in this invention is to calculate the electromagnetic field strength inside the cavity and then use numerical simulation to intuitively predict whether the microwave cutoff rate will meet the standard at the next time step. Then, the dielectric properties of the current absorbing coating are recorded, and based on this, when it is predicted that the microwave cutoff rate will not meet the standard at the next time step, the microwave power of the controllable microwave source is adjusted in advance to assist in adjusting the process conditions.

[0039] Furthermore, in this embodiment of the invention, to ensure process safety, a microwave shutdown mechanism is introduced, taking advantage of the low thermal inertia and instantaneous restart capability of microwaves. Specifically, when the control algorithm predicts that the required computation time exceeds the time step, the shutdown mechanism is triggered to briefly shut down the microwave source equipment. This ensures that the process is not affected while avoiding safety hazards caused by excessively long response times leading to uninterrupted microwave operation. Upon obtaining a new analytical result (i.e., a new microwave power adjustment command), the shutdown mechanism is deactivated, and the microwave source is restarted according to the new controllable microwave source control command.

[0040] Furthermore, in this embodiment of the invention, a step may be included to control the material feed rate by rewinding when multiple adjustments are ineffective, so as to avoid the pyrolysis temperature required for the biomass microwave pyrolysis gasification process being substandard due to excessively high feed rate or excessively low microwave power.

[0041] 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

[0042] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a flowchart illustrating the steps of the microwave pyrolysis reactor control method described in this invention;

[0044] Figure 2 This is a schematic diagram of the structure of the microwave pyrolysis reactor control device described in this invention;

[0045] Figure 3 This is a schematic diagram of the structure of the microwave pyrolysis reactor control equipment described in this invention. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Example One

[0050] To improve the process control effect of microwave pyrolysis reactors, such as Figure 1 As shown, an embodiment of the present invention provides a method for controlling a microwave pyrolysis reactor, comprising the following steps:

[0051] S11. A three-dimensional electromagnetic field model is generated and meshed based on the microwave pyrolysis reactor model; the reaction chamber of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity; a controllable microwave source is located in the microwave reaction sub-cavity;

[0052] This invention utilizes three-dimensional electromagnetic field simulation technology to simulate the electromagnetic field strength and temperature distribution data within the cavity of a microwave reactor.

[0053] In this embodiment of the invention, the reaction chamber of the microwave pyrolysis reactor is specifically configured. Based on different functions or roles, the reaction chamber is logically or physically divided into three sub-cavities: a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity. Specifically, this can be achieved through:

[0054] Based on the different functions of each section of the reaction cavity, the reaction cavity is divided into microwave reaction sub-cavities, microwave absorption sub-cavities, and microwave transition sub-cavities, with each sub-cavity located in a different section of the reaction cavity.

[0055] Alternatively, it could also be:

[0056] Three independent cavities are set up: a microwave reaction subcavity, a microwave absorption subcavity, and a microwave transition subcavity. These cavities are then connected by flanges, and together they form the reaction chamber of the microwave pyrolysis reactor.

[0057] In this embodiment of the invention, the microwave reaction sub-cavity is provided with multiple controllable microwave sources for heating materials; the inner wall of the microwave absorption sub-cavity is covered with a wave-absorbing coating to absorb electromagnetic waves and prevent electromagnetic waves from overflowing and causing electromagnetic radiation interference; the microwave transition sub-cavity is used to verify or detect whether the remaining electromagnetic waves after being absorbed by the wave-absorbing coating (i.e., absorbing electromagnetic waves) meet the set standards.

[0058] In this embodiment of the invention, the material of the microwave absorbing coating may be one or more of the following: stony ferrite, SiC ceramic, retinol Schiff base, retinol Schiff base complex, carbonyl iron powder, carbonyl nickel powder, fiber, nickel fiber, cobalt fiber and alloy fiber; preferably SiC ceramic.

[0059] In practical applications, based on the modeling of the microwave pyrolysis reactor, the reactor wall, material inlet, material outlet, microwave reaction sub-cavity, microwave absorption sub-cavity, microwave transition sub-cavity, and vertical moving bed cavity are set up. A three-dimensional electromagnetic field model of the microwave pyrolysis reactor is then generated and meshed. Specifically, this can be achieved through:

[0060] Let the internal volume of the microwave reaction sub-cavity be V. r The internal volume of the microwave absorption sub-cavity is V. a The internal volume of the microwave transition sub-cavity is V. t The internal volume of the vertical moving bed cavity is V; the number of each controllable microwave source is n;

[0061] Let the power of the i-th controllable microwave source be P. i The total power of the microwave pyrolysis reactor is

[0062] The meshed three-dimensional electromagnetic field model has d mesh elements and is stored in set D, where the electromagnetic intensity of the i-th mesh element belonging to set D is E. i The temperature is T i .

[0063] In practical applications, the mesh in the embodiments of the present invention can be one or more of tetrahedral mesh, hexahedral mesh, pyramidal mesh, wedge mesh and polyhedral mesh; the calibration method can be one or more of general physics, fluid dynamics, plasma and semiconductor.

[0064] It should be noted that the microwave pyrolysis reactor in this embodiment of the invention is a continuously fed microwave pyrolysis reactor. The material continuously passes through the microwave reaction sub-cavity, microwave absorption sub-cavity and microwave transition sub-cavity from the feed port of the reaction chamber of the microwave pyrolysis reactor, and finally exits from the discharge port of the vertical moving bed chamber of the microwave pyrolysis reactor. The microwave reaction sub-cavity of the microwave pyrolysis reactor heats the material in the cavity through multiple controllable microwave sources.

[0065] S12. Obtain the input parameters of the three-dimensional electromagnetic field model; the input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, the current dielectric properties of the microwave absorbing coating, and the mathematical model of the dielectric properties of the microwave absorbing coating with frequency and temperature.

[0066] Before simulating the electromagnetic field strength and temperature field distribution inside the microwave pyrolysis reactor, it is necessary to obtain the various input parameters of the three-dimensional electromagnetic field model. Specifically, these parameters may include the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant and feed rate of the heated material, the current dielectric properties of the absorbing coating, and the mathematical model of the dielectric properties of the absorbing coating with frequency and temperature.

[0067] S13. 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 and electromagnetic field strength of each sub-cavity after one time step.

[0068] 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.

[0069] 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 values ​​of the temperature field distribution and electromagnetic field strength of the reactor cavity at the current time and the next time step. That is, based on the current dielectric properties of the microwave absorbing coating, the temperature field distribution and electromagnetic field strength of each cavity of the reactor (including microwave reaction sub-cavity, microwave absorption sub-cavity and microwave transition sub-cavity) are estimated in grid units to obtain the estimated values ​​of temperature and electromagnetic field strength of each grid.

[0070] S14. Calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorber cavity based on the predicted temperature value and the input parameters.

[0071] The dielectric properties of the microwave absorbing coating are affected by temperature. Therefore, after obtaining the predicted temperature field distribution over a long period of time, the predicted dielectric properties of the microwave absorbing coating over a long period of time can be calculated using the grid of the three-dimensional electromagnetic field model as the unit, based on the mathematical model of dielectric properties with frequency and temperature.

[0072] S15. Calculate the predicted electromagnetic field strength correction value in the microwave transition sub-cavity based on the predicted electromagnetic field strength estimate and the predicted dielectric properties of each sub-cavity.

[0073] The dielectric properties of the absorbing coating may change over a longer period of time, and the electromagnetic field strength prediction estimate obtained in step S13 is based on the dielectric properties at the current time, so its value will have some error. In view of this, in this embodiment of the invention, after obtaining the electromagnetic field strength prediction estimate, the electromagnetic field strength prediction estimate is also corrected by the predicted dielectric properties over a longer period of time to obtain a more accurate predicted electromagnetic field strength correction value in the microwave transition cavity.

[0074] S16. Based on the predicted electromagnetic field strength correction value, determine whether the microwave transition subcavity includes an out-of-standard grid exceeding the preset safety threshold after one time step. If yes, reduce the current microwave power of the controllable microwave source corresponding to the out-of-standard grid according to the first preset rule and return to step S13; if no, generate a microwave power adjustment command for the controllable microwave source corresponding to the out-of-standard grid with the current microwave power as the target microwave power.

[0075] To promptly prevent microwave cutoff rates from exceeding limits, this embodiment of the invention employs a method that, once a grid is detected in the microwave transition subcavity, the power of the controllable microwave source corresponding to the grid exceeding the preset safety threshold will be reduced in the next step. Because this method requires relatively little computation, it effectively improves the control response speed. Specifically, it can be:

[0076] When the microwave transition subcavity includes an out-of-standard grid whose predicted electromagnetic field strength exceeds a preset safety threshold, the current microwave power of the controllable microwave source corresponding to the out-of-standard grid is reduced according to a first preset ratio. In practical applications, the specific value of the first preset ratio can be selected within 2% to 5%, and more preferably within 2% to 3%.

[0077] In this embodiment of the invention, based on the predicted electromagnetic field strength correction value, it is determined whether the microwave transition sub-cavity after one time step includes an excessive grid exceeding a preset safety threshold. If so, the current microwave power of the controllable microwave source corresponding to the excessive grid is reduced according to a first preset rule. The specific detailed steps may be as follows:

[0078] S21. Traverse all grids for the maximum electromagnetic field strength point, identify all grids whose maximum electromagnetic field strength point exceeds the preset safety threshold as out-of-standard grids, and store the spatial coordinates and electromagnetic field strength data of the out-of-standard grids into the data set Danger.

[0079] To determine whether the microwave transition subcavity contains grids exceeding a preset safety threshold, and to identify which grids exceed the preset safety threshold, this embodiment of the invention employs a traversal approach to determine the point of maximum electromagnetic field strength in the grids of the microwave transition subcavity. When the maximum electromagnetic field strength point exceeds the preset safety threshold, the spatial coordinates of the grid corresponding to the maximum electromagnetic field strength point and the electromagnetic field strength data are stored in the data set Danger. The same determination is then performed on the remaining grids to select all grids that exceed the preset safety threshold, that is, to select all grids whose electric field strength exceeds the standard (exceeding the preset safety threshold of electromagnetic field strength) in the next time step, and the information data of these grids is stored in the data set Danger.

[0080] S22. Traverse all grids for the minimum electromagnetic field strength point, and store the spatial coordinates and electromagnetic field strength data of all grids whose minimum electromagnetic field strength point is lower than the preset safety threshold into the data set Safe.

[0081] In this embodiment of the invention, it is also necessary to determine which grids in the microwave transition subcavity are below a preset safety threshold. This embodiment of the invention adopts a traversal method to determine the minimum electromagnetic field strength point of the grids in the microwave transition subcavity. When the minimum electromagnetic field strength point does not exceed the preset safety threshold, the grid spatial coordinates and electromagnetic field strength data corresponding to the minimum electromagnetic field strength point are stored in the data set Safe. Then, the same judgment is performed on the remaining grids to select all grids that do not exceed the preset safety threshold. That is, all grids whose electric field strength in the next time step does not exceed the preset safety threshold are selected, and the information data of these grids are stored in the data set Safe.

[0082] S23. For the grid currently stored in the Danger data set, according to Maxwell's equations for electric field strength, solve for the controllable electric field strength component range E within the microwave transition cavity where the maximum electromagnetic field strength of the material in the grid does not exceed the preset safety threshold. x-j E y-j E z-j For the grid currently stored in the data set Safe, based on Maxwell's equations for electric field strength, solve for the range ΔE of the controllable electric field strength margin within the microwave transition cavity where the minimum electromagnetic field strength of the material in the grid reaches the preset safety threshold. x-j ΔE y-j ΔE z-j ;

[0083] Specifically, for a grid j in the Danger dataset, assuming a controllable microwave source transmits only an electromagnetic wave with frequency f along the x-axis at time t = 0, the electric field intensity components along the other two axes are 0. After several time steps (depending on the distance between the grid and the microwave source and the porosity of the material), the electric field intensity reaches grid j. Considering various attenuations during microwave transmission (such as reflection, diffraction, absorption, etc., taking the theoretical minimum absorption of the absorbing coating layer on the microwave absorber cavity wall at this time step), the maximum electric field intensity of grid j at the next time step is equal to the upper limit of the electromagnetic field intensity it can reach. The electric field intensity component along the x-axis at this time is called E. x-j The theoretical maximum value E xj-max Similarly, we can obtain E. y-j E z-j The maximum value E yj-max E zj-max Then, according to E x-j E y-j E z-j The range of the maximum value and Maxwell's equations are combined to establish E based on the coordinates of grid j within the reactor cavity (i.e., the cavity of the microwave reactor). x-j E y-j E z-j A planar triangular coordinate system (the minimum value of the x-axis in this coordinate system is 0, and the maximum value is E). xj-max (The same applies to the y and z axes). This coordinate system represents the controllable electric field strength component range where the maximum electromagnetic field strength of grid j in the next time step does not exceed the maximum value of the component in that direction of the preset safety threshold.

[0084] For a specific grid j in the dataset Safe, based on the components of the preset safety threshold of the electromagnetic field strength in three-dimensional space, the electric field strength value of that grid j in the dataset Safe is retrieved and decomposed in three dimensions. The difference between the decomposed value and the maximum value of the components of the preset safety threshold in three-dimensional space yields the component range ΔE of the controllable electric field strength margin for the minimum electromagnetic field strength of the biomass within the grid in the microwave transition cavity to reach the preset safety threshold. x-j ΔE y-j ΔE z-j ;

[0085] S24. After obtaining the controllable electric field intensity components and ranges of all grids in the Danger set, and without exceeding the components and ranges of the controllable electric field intensity margins of all grids in the Safe set, decompose the forward waves transmitted by all controllable microwave sources in the microwave reactive subcavity through the matrix waveguide; the components of the forward waves in the three directions are respectively

[0086] In this embodiment of the invention, the premise that the components and range of the controllable electric field strength margin do not exceed all grids in the set Safe means that when the components of the forward wave in the three directions are obtained as follows: Afterwards, it is necessary to re-verify whether the increase in the controllable electric field intensity of all grids in Safe falls within the component range ΔE of the controllable electric field intensity margin in the three dimensions. x-j ΔE y-j ΔE z-j middle.

[0087] S25. Iterate through all possibilities of the components of all controllable microwave sources in the microwave reactive subcavity that are transmitted to the microwave transition subcavity in the next time step, to obtain the optimal set of electric field strength components that allows all grids in Danger to satisfy a value not exceeding the preset safety threshold. The total power corresponding to this set is P. j And adjust the microwave power of the controllable microwave source in the microwave reaction subcavity accordingly.

[0088] Specifically, at the next time step, for the n controllable microwave sources belonging to the current microwave reactive subcavity, the components of its forward wave in the three directions are as follows: In this embodiment of the invention, it is necessary to traverse all possibilities of the component of the controllable microwave source belonging to the microwave reactive subcavity at the next time step, that is, to traverse the E related to Danger. x-j E y-j E z-j All possibilities in the planar triangular coordinate system are ultimately used to obtain the optimal set of electric field intensity components that guarantee the maximum electric field intensity of the cell grid in the Danger at the next time step does not exceed the preset safety threshold. (The electric field strength of the cell grid in Safe has been ensured in step S24, so there is no need to discuss it again.)

[0089] For all possibilities of the components of the controllable microwave source in the microwave reactive subcavity at the current time step t, For example, the specific method of obtaining it is as follows:

[0090] Given that the number of microwave sources in the microwave reactive subcavity is n, for the set of n controllable electric field intensity component ranges n E ={E x-1 E x-2 , ..., E x-n}, from the first element E x-1Begin the traversal. Each iteration iterates through all elements that intersect with the given element (using a for(for(...)) statement), recording the maximum number of elements and storing it in an empty array `a = {}`. Simultaneously, record the corresponding intersection interval and store it in an empty matrix `b = {}`. Finally, compare the maximum number of elements in each iteration result. The largest number in array `a` satisfies the condition, and the corresponding intersection interval stored in matrix `b` is the correct one. The range of values.

[0091] then, and The method of obtaining and Similarly, I will not go into details here.

[0092] After obtaining the optimal set of electric field intensity components The current total power corresponding to this set is P. j And adjust the microwave power of the controllable microwave source in the microwave reaction subcavity accordingly.

[0093] Preferably, in this embodiment of the invention, it further includes:

[0094] S17. Record the temperature distribution at the outlet of the reaction chamber at the current time step, generate control instructions for the controllable microwave source based on the current microwave power, and generate speed control instructions for the screw conveyor shaft based on the current material feed rate.

[0095] The temperature distribution at the outlet of the reaction cavity, that is, the temperature distribution of the cross section at the outlet of the reaction cavity, is recorded for the purpose of providing initial values ​​for calculating the data in the microwave absorbing sub-cavity at the next time step. Since the reaction cavity and the microwave absorbing sub-cavity are connected, the outlet of the reaction cavity is the inlet of the microwave absorbing sub-cavity.

[0096] Based on the control instructions for generating a controllable microwave source using the current microwave power, specifically in steps S21-S25, the optimal set of electric field intensity components can be obtained. The microwave power corresponding to each controllable microwave source is obtained through the component set. Each controllable microwave source has a control unit that controls the microwave power. The purpose of generating the control command for the controllable microwave source is to transmit the newly obtained microwave power to these control units in order to achieve microwave power modulation.

[0097] The function of speed control commands is similar to that of microwave source control commands, also aimed at controlling the material feeding rate. In actual production, the feeding rate is a specific concept of material transmission speed, and there is no corresponding control device that can directly correspond to the speed. The only thing that can be adjusted is the speed of the screw shaft at the conveyor end. By calculating the functional relationship between the speed and shaft distance and the feeding rate, the material feeding rate can be indirectly controlled.

[0098] Preferably, in embodiments of the present invention, an additional step for controlling the target material feed rate may be included, specifically:

[0099] When the time required to generate a microwave power adjustment command for the controllable microwave source corresponding to the out-of-range grid with the current microwave power as the target microwave power is greater than the preset time step, a shutdown mechanism is triggered to temporarily shut down the microwave source device until the microwave power adjustment command is generated.

[0100] In this embodiment of the invention, steps S11 to S16 may require multiple iterations to obtain an analytical solution that satisfies the boundary conditions. Therefore, before obtaining the analytical solution, the system cannot receive control commands from the new controllable microwave source. Consequently, the microwave source will continue to heat the microwave pyrolysis cavity using the microwave power of the current time step. To avoid safety hazards caused by excessively long response times leading to microwaves not being shut off, this embodiment of the invention also introduces a microwave shutdown mechanism. When the control algorithm predicts that the required computation time is longer than the time step, it triggers the shutdown mechanism to temporarily shut down the microwave source equipment. This ensures that the process is not affected while avoiding safety hazards caused by excessively long response times leading to microwaves not being shut off. Once a new analytical solution is obtained, the shutdown mechanism is closed, and the microwave source is restarted according to the new control commands from the controllable microwave source.

[0101] Preferably, in this embodiment of the invention, the method of controlling the material feed rate by rewinding may be included when multiple adjustments are ineffective. This is to avoid the pyrolysis temperature required for the biomass microwave pyrolysis gasification process being insufficient due to excessively high feed rate or excessively low microwave power. Specifically:

[0102] S18. If, under the current material feeding rate, the predicted temperature distribution at the microwave reaction sub-cavity outlet still does not meet the preset target temperature range after a preset number of calculation cycles, the material feeding rate is adjusted to the value where the temperature distribution at the outlet meets the predicted target temperature range before the last update; material feeding rate.

[0103] S19. If, under the current controllable microwave power, the predicted temperature distribution at the outlet of the microwave reaction sub-cavity still does not meet the preset target temperature range after a preset number of calculation cycles, the material feed rate is adjusted to the value at the outlet before the last update, which satisfies the predicted target temperature range.

[0104] In summary, the embodiments of the present invention, based on the three-dimensional electromagnetic field model generated from the modeling of the microwave reactor, can predict the temperature and electromagnetic field strength of each cavity of the reactor, thereby obtaining the predicted dielectric properties of the microwave absorbing coating. Thus, the actual microwave shielding effect of the microwave absorbing coating within the reactor can be obtained based on the predicted values.

[0105] The purpose of setting up a microwave transition sub-cavity in this invention is to calculate the electromagnetic field strength inside the cavity and then use numerical simulation to intuitively predict whether the microwave cutoff rate will meet the standard at the next time step. Then, the dielectric properties of the current absorbing coating are recorded, and based on this, when it is predicted that the microwave cutoff rate will not meet the standard at the next time step, the microwave power of the controllable microwave source is adjusted in advance to assist in adjusting the process conditions.

[0106] Furthermore, in this embodiment of the invention, to ensure process safety, a microwave shutdown mechanism is introduced, taking advantage of the low thermal inertia and instantaneous restart capability of microwaves. Specifically, when the control algorithm predicts that the required computation time exceeds the time step, the shutdown mechanism is triggered to briefly shut down the microwave source equipment. This ensures that the process is not affected while avoiding safety hazards caused by excessively long response times leading to uninterrupted microwave operation. Upon obtaining a new analytical result (i.e., a new microwave power adjustment command), the shutdown mechanism is deactivated, and the microwave source is restarted according to the new controllable microwave source control command.

[0107] Furthermore, in this embodiment of the invention, a step may be included to control the material feed rate by rewinding when multiple adjustments are ineffective, so as to avoid the pyrolysis temperature required for the biomass microwave pyrolysis gasification process being substandard due to excessively high feed rate or excessively low microwave power.

[0108] Example 2

[0109] Corresponding to the method embodiment, another aspect of the present invention also provides a microwave pyrolysis reactor control device. Figure 2 This diagram illustrates the structure of a microwave pyrolysis reactor control device provided in an embodiment of the present invention. The microwave pyrolysis reactor control device is... Figure 1 The device corresponding to the microwave pyrolysis reactor control method described in the corresponding embodiment is implemented through a virtual device. Figure 1 In the corresponding embodiment of the microwave pyrolysis reactor control method, the various virtual modules constituting the microwave pyrolysis reactor control device can be executed by electronic devices, such as network devices, terminal devices, or servers. Specifically, the microwave pyrolysis reactor control device in this embodiment of the invention includes:

[0110] Model building unit 01 is used to generate a three-dimensional electromagnetic field model and mesh it based on the microwave pyrolysis reactor model; the reaction cavity of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity and a microwave transition sub-cavity; a controllable microwave source is located in the microwave reaction sub-cavity;

[0111] The parameter acquisition unit 02 is used to acquire the input parameters of the three-dimensional electromagnetic field model. The input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, and a mathematical model of the dielectric properties of the absorbing coating with respect to frequency and temperature.

[0112] Model calculation unit 03 is used to calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters with a preset time step as the calculation period. The simulation results include the predicted temperature and electromagnetic field strength of each sub-cavity after one time step.

[0113] The dielectric property calculation unit 04 is used to calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorbing sub-cavity based on the predicted temperature value and the input parameters.

[0114] Electromagnetic field strength calculation unit 05 is used to calculate the predicted electromagnetic field strength value in the microwave transition sub-cavity based on the predicted electromagnetic field strength value and the predicted dielectric properties of each sub-cavity.

[0115] The power adjustment command unit 06 is used to determine whether the microwave transition subcavity contains an out-of-standard grid exceeding a preset safety threshold after one time step based on the predicted electromagnetic field strength correction value. If so, the current microwave power of the controllable microwave source corresponding to the out-of-standard grid is reduced according to the first preset rule and returned to the model calculation unit; if not, a microwave power adjustment command for the controllable microwave source corresponding to the out-of-standard grid is generated with the current microwave power as the target microwave power.

[0116] It should be noted that the specific implementation and technical effects of the microwave pyrolysis reactor control device in the embodiments of the present invention can be found by referring to... Figure 1 The corresponding microwave pyrolysis reactor control methods will not be elaborated here.

[0117] Example 3

[0118] Corresponding to the method embodiments, this invention also provides a microwave pyrolysis reactor control device, such as a terminal or 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.

[0119] An example diagram of the hardware structure block diagram of the microwave pyrolysis reactor control device provided in this application is shown below.Figure 3 As shown, it may include:

[0120] Processor 1, communication interface 2, memory 3, and communication bus 4;

[0121] The processor 1, communication interface 2, and memory 3 communicate with each other via communication bus 4.

[0122] Optionally, communication interface 2 can be an interface of a communication module, such as the interface of a GSM module;

[0123] Processor 1 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0124] Memory 3 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0125] Specifically, processor 1 is used to execute the computer program stored in memory 3 to perform the following steps:

[0126] S11. A three-dimensional electromagnetic field model is generated and meshed based on the microwave pyrolysis reactor model; the reaction chamber of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity; a controllable microwave source is located in the microwave reaction sub-cavity;

[0127] S12. Obtain the input parameters of the three-dimensional electromagnetic field model; the input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, and the mathematical model of the dielectric properties of the absorbing coating with frequency and temperature.

[0128] S13. 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 and electromagnetic field strength of each sub-cavity after one time step.

[0129] S14. Calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorber cavity based on the predicted temperature value and the input parameters.

[0130] S15. Calculate the predicted electromagnetic field strength correction value in the microwave transition sub-cavity based on the predicted electromagnetic field strength estimate and the predicted dielectric properties of each sub-cavity.

[0131] S16. Based on the predicted electromagnetic field strength correction value, determine whether the microwave transition subcavity includes an out-of-standard grid exceeding the preset safety threshold after one time step. If yes, reduce the current microwave power of the controllable microwave source corresponding to the out-of-standard grid according to the first preset rule and return to step S13; if no, generate a microwave power adjustment command for the controllable microwave source corresponding to the out-of-standard grid with the current microwave power as the target microwave power.

[0132] 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 microwave pyrolysis reactor control method provided in the embodiments of the present invention.

[0133] Example 4

[0134] 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:

[0135] S11. A three-dimensional electromagnetic field model is generated and meshed based on the microwave pyrolysis reactor model; the reaction chamber of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity; a controllable microwave source is located in the microwave reaction sub-cavity;

[0136] S12. Obtain the input parameters of the three-dimensional electromagnetic field model; the input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, and the mathematical model of the dielectric properties of the absorbing coating with frequency and temperature.

[0137] S13. 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 and electromagnetic field strength of each sub-cavity after one time step.

[0138] S14. Calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorber cavity based on the predicted temperature value and the input parameters.

[0139] S15. Calculate the predicted electromagnetic field strength correction value in the microwave transition sub-cavity based on the predicted electromagnetic field strength estimate and the predicted dielectric properties of each sub-cavity.

[0140] S16. Based on the predicted electromagnetic field strength correction value, determine whether the microwave transition subcavity includes an out-of-standard grid exceeding the preset safety threshold after one time step. If yes, reduce the current microwave power of the controllable microwave source corresponding to the out-of-standard grid according to the first preset rule and return to step S13; if no, generate a microwave power adjustment command for the controllable microwave source corresponding to the out-of-standard grid with the current microwave power as the target microwave power.

[0141] Optionally, the refined and extended functions of the program can be found in the description above.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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 for controlling a biomass microwave pyrolysis gasification process, applicable to microwave pyrolysis reactors equipped with microwave-absorbing coatings, characterized in that, Including the following steps: S11. A three-dimensional electromagnetic field model is generated based on the microwave pyrolysis reactor model and then meshed; the reaction chamber of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, a microwave transition sub-cavity, and a vertical moving bed cavity; A controllable microwave source is located in the microwave reaction sub-cavity; the step of generating a three-dimensional electromagnetic field model based on the microwave pyrolysis reactor and meshing it includes: setting the internal volume of the microwave reaction sub-cavity as V. r The internal volume V of the microwave absorption sub-cavity a The internal volume of the microwave transition sub-cavity is V. t The internal volume of the vertical moving bed cavity is V; the number of controllable microwave sources is n; let the power of the i-th controllable microwave source be P. i The total power of the microwave pyrolysis reactor is The meshed three-dimensional electromagnetic field model has d mesh elements and is stored in set D, where the electric field strength of the i-th mesh element belonging to set D is E. i The temperature is T i ; S12. Obtain the input parameters of the three-dimensional electromagnetic field model; the input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, and the mathematical model of the dielectric properties of the absorbing coating with frequency and temperature. S13. 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 and electromagnetic field strength of each sub-cavity after one time step. S14. Calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorber cavity based on the predicted temperature value and the input parameters. S15. Calculate the predicted electromagnetic field strength correction value in the microwave transition sub-cavity based on the predicted electromagnetic field strength estimate and the predicted dielectric properties of each sub-cavity. S16. Based on the predicted electromagnetic field strength correction value, determine whether the microwave transition subcavity includes an out-of-standard grid exceeding the preset safety threshold after one time step. If yes, reduce the current microwave power of the controllable microwave source corresponding to the out-of-standard grid according to the first preset rule and return to step S13; if no, generate a microwave power adjustment command for the controllable microwave source with the current microwave power as the target microwave power. Specifically, based on the predicted electromagnetic field strength correction value, it is determined whether the microwave transition sub-cavity after one time step includes an excessive grid exceeding a preset safety threshold. If so, the current microwave power of the controllable microwave source corresponding to the excessive grid is reduced according to a first preset rule, including: S21. Based on the predicted electromagnetic field strength correction value, traverse all grids for the maximum electromagnetic field strength point, determine all grids whose maximum electromagnetic field strength point exceeds the preset safety threshold as out-of-standard grids, and store the spatial coordinates and electromagnetic field strength data of the out-of-standard grids into the data set Danger. S22. Traverse all grids for the minimum electromagnetic field strength point, and store the spatial coordinates and electromagnetic field strength data of all grids whose minimum electromagnetic field strength point is lower than the preset safety threshold into the data set Safe. S23. For the grid currently stored in the Danger data set, according to Maxwell's equations for electric field strength, solve for the range of controllable electric field strength components within the grid where the maximum electromagnetic field strength of the material in the microwave transition cavity does not exceed the preset safety threshold. E x-j , E y-j , E z-j For the grid currently stored in the data set Safe, based on Maxwell's equations for electric field strength, solve for the range of controllable electric field strength margins within the microwave transition cavity for the minimum electromagnetic field strength of the material in the grid to reach the preset safety threshold. ; S24. After obtaining the controllable electric field intensity components and ranges of all grids in the Danger set, and without exceeding the components and ranges of the controllable electric field intensity margins of all grids in the Safe set, decompose the forward waves transmitted by all controllable microwave sources in the microwave reactive subcavity through the matrix waveguide; the components of the forward waves in the three directions are respectively ; S25. Iterate through all possibilities of the components of all controllable microwave sources in the microwave reactive subcavity that are transmitted to the microwave transition subcavity in the next time step, to obtain the optimal set of electric field strength components that allows all grids in Danger to satisfy a value not exceeding the preset safety threshold. The current total power corresponding to this set is P. j； And adjust the microwave power of the controllable microwave source in the microwave reaction subcavity accordingly.

2. The biomass microwave pyrolysis gasification process control method according to claim 1, characterized in that, Also includes: S17. Record the temperature distribution at the outlet of the reaction chamber at the current time step, generate control instructions for the controllable microwave source based on the current microwave power, and generate speed control instructions for the screw conveyor shaft based on the current material feeding rate.

3. The biomass microwave pyrolysis gasification process control method according to claim 1 or 2, characterized in that, The reaction cavity includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity, specifically: Based on the different functions of each section of the reaction cavity, the reaction cavity is divided into the microwave reaction sub-cavity, the microwave absorption sub-cavity, and the microwave transition sub-cavity; or, The microwave reaction sub-cavity, the microwave absorption sub-cavity, and the microwave transition sub-cavity are all independent cavities, and the sub-cavities are connected by flanges.

4. The biomass microwave pyrolysis gasification process control method according to claim 2, characterized in that, Also includes: When the time required to generate a microwave power adjustment command for the controllable microwave source corresponding to the out-of-range grid with the current microwave power as the target microwave power is greater than the preset time step, a shutdown mechanism is triggered to temporarily shut down the microwave source device until the microwave power adjustment command is generated.

5. The biomass microwave pyrolysis gasification process control method according to claim 2, characterized in that, Also includes: S18. If, under the current material feeding rate, the predicted temperature distribution at the microwave reaction sub-cavity outlet still does not meet the preset target temperature range after a preset number of calculation cycles, the material feeding rate is adjusted to the value where the temperature distribution at the outlet before the last update meets the predicted target temperature range.

6. The biomass microwave pyrolysis gasification process control method according to claim 3, characterized in that, The materials of the absorbing coating include: One or more of SiC ceramics, carbonyl iron powder, carbonyl nickel powder, nickel fiber, and alloy fiber.

7. The biomass microwave pyrolysis gasification process control method according to claim 6, characterized in that, The microwave absorbing coating is made of SiC ceramic.

8. A control device for a microwave pyrolysis reactor, wherein the microwave pyrolysis reactor is provided with a microwave absorbing coating, characterized in that, Used to implement the biomass microwave pyrolysis gasification process control method as described in any one of claims 1 to 7; The microwave pyrolysis reactor control device includes: The model building unit is used to generate a three-dimensional electromagnetic field model and mesh it based on the microwave pyrolysis reactor; the reaction cavity of the microwave pyrolysis reactor includes a microwave reaction sub-cavity, a microwave absorption sub-cavity, and a microwave transition sub-cavity; a controllable microwave source is located in the microwave reaction sub-cavity; The parameter acquisition unit is used to acquire the input parameters of the three-dimensional electromagnetic field model. The input parameters include: the current microwave frequency and current microwave power of each controllable microwave source in the microwave pyrolysis reactor, the dielectric constant of the heated material, the feed rate, and a mathematical model of the dielectric properties of the absorbing coating with respect to frequency and temperature. The model calculation unit is used to calculate the simulation results of the three-dimensional electromagnetic field model according to the input parameters with a preset time step as the calculation period. The simulation results include the predicted temperature value and the predicted electromagnetic field strength value of each sub-cavity after one time step. The dielectric property calculation unit is used to calculate the predicted dielectric properties of the microwave absorbing coating in the microwave absorber cavity based on the predicted temperature value and the input parameters. An electromagnetic field strength calculation unit is used to calculate the predicted electromagnetic field strength correction value in the microwave transition sub-cavity based on the predicted electromagnetic field strength estimate and the predicted dielectric properties of each sub-cavity. The power adjustment command unit is used to determine whether the microwave transition subcavity contains an out-of-standard grid exceeding a preset safety threshold after one time step based on the predicted electromagnetic field strength correction value. If so, the current microwave power of the controllable microwave source corresponding to the out-of-standard grid is reduced according to the first preset rule and returned to the model calculation unit; if not, a microwave power adjustment command for the controllable microwave source is generated with the current microwave power as the target microwave power.

9. A microwave pyrolysis reactor control device, characterized in that, include: Memory, used to store computer programs; A processor is configured to invoke and execute the computer program to implement the steps of the biomass microwave pyrolysis gasification process control method as described in any one of claims 1-7.

10. A storage medium, characterized in that, Includes software programs adapted for execution by a processor of the steps of the biomass microwave pyrolysis gasification process control method as described in any one of claims 1-7.

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