Methods, apparatus, equipment and storage media for accelerating biomass microwave pyrolysis processes

Abstract

This invention discloses a method, apparatus, equipment, and storage medium for accelerating biomass microwave pyrolysis. The method includes: modeling a continuously fed microwave reactor, generating a three-dimensional electromagnetic field model, and meshing it; dividing the inner cavity of the microwave reactor into a preset number of temperature control zones based on the three-dimensional electromagnetic field model, and setting a target temperature range for each zone; obtaining input parameters for the three-dimensional electromagnetic field model; calculating simulation results based on the input parameters; determining whether each temperature control zone includes meshes exceeding the target temperature range; if so, adjusting the microwave power of the controllable microwave source for the meshes exceeding the target temperature range, and using the adjusted microwave power as the current microwave power; if not, increasing the updated material feed rate; and generating a feed rate command based on the updated material feed rate. This invention can improve the efficiency of the microwave reactor by increasing the feed rate.

Description

Technical Field

[0001] This invention relates to the field of chemical processes, and in particular to methods, apparatus, equipment and storage media for accelerating biomass microwave pyrolysis processes. 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] Because microwave heating has the characteristics of fast heating rate and short residence time, the usual way to control temperature is to establish a large constant temperature zone at the end of the process to stabilize the discharge temperature. However, this inadvertently compresses the pyrolysis space in the reactor and reduces the processing efficiency of reactors of the same size.

[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 achieve temperature control and improve the processing capacity of microwave reactors by increasing the material feeding rate.

[0009] This invention provides a method for accelerating the microwave pyrolysis process of biomass, 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;

[0011] S12. Based on the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into a preset number of temperature control zones, and the target temperature range of each temperature control zone is set respectively.

[0012] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feed rate of the biomass.

[0013] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters; the simulation results include the predicted temperature values ​​of each temperature control zone after one time step.

[0014] S15. Based on the predicted temperature values ​​of each temperature control zone, determine whether each temperature control zone includes grids that exceed the target temperature range. If yes, adjust the microwave power of the controllable microwave source for grids that exceed the target temperature range according to preset rules, use the adjusted microwave power of the controllable microwave source as the current microwave power, and return to step S14. If no, increase and update the material feeding rate and return to step S14.

[0015] S16. Generate the microwave reactor feed rate command based on the updated material feed rate.

[0016] Preferably, in this invention, it further includes:

[0017] S17. If, at the current material feeding rate, the temperature control zone still includes grids exceeding the target temperature range after a preset number of calculation cycles, the material feeding rate is reduced to the value before the last update.

[0018] Preferably, in this invention, the preset number includes:

[0019] 3 to 40.

[0020] Preferably, in this invention, dividing the inner cavity of the microwave reactor into a predetermined number of temperature-controlled zones includes:

[0021] The microwave reactor's interior is divided into a predetermined number of temperature control zones of equal length, or, based on the heating curve, the microwave reactor's interior is divided into a predetermined number of temperature control zones with the same temperature difference.

[0022] 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:

[0023] Let the internal volume of the microwave reactor be V; and the number of the controllable microwave sources be n.

[0024] Let the power of the i-th controllable microwave source be P. i The total power of the microwave reactor is

[0025] 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 ,

[0026] Preferably, in this invention, the step of determining whether each temperature control zone includes a grid exceeding the target temperature range based on the predicted temperature value of each temperature control zone, and adjusting the microwave power of the controllable microwave source of the grid exceeding the target temperature range according to a preset rule, includes:

[0027] Perform the following steps for each of the temperature control zones:

[0028] S21. Obtain the current microwave power of each controllable microwave source at the first time step when the biomass enters the temperature control zone according to the three-dimensional electromagnetic field model;

[0029] S22. Traverse the maximum temperature point of the grid cell in the temperature control zone. If the maximum temperature point exceeds the upper limit of the target temperature range, store the grid cell identifier and temperature data corresponding to the maximum temperature point into the data set Col1.

[0030] S23. Traverse the minimum temperature point of the grid cell in the temperature control zone. If the minimum temperature point exceeds the lower limit of the target temperature range, store the grid cell identifier and temperature data corresponding to the minimum temperature point into the data set Col2.

[0031] S24. For the grid cells currently stored in the data set Col1, according to Maxwell's equations for electric field intensity, solve for the controllable electric field intensity component range E of the biomass within the grid cell in the temperature control zone during the remaining residence time, ensuring that the maximum temperature does not exceed the upper limit of the target temperature range. x-j E y-j E z-j For the grid cells currently stored in the data set Col2, based on Maxwell's equations for electric field intensity, solve for the controllable electric field intensity component range E of the biomass within the grid cell in the temperature-controlled zone during the remaining residence time, ensuring that the minimum temperature is not lower than the lower limit of the target temperature range. x-i E y-i E z- i;

[0032] S25. After obtaining the controllable electric field intensity component range of all grid cells in the sets Col1 and Col2, the forward waves transmitted by all controllable microwave sources belonging to the temperature control zone through the matrix waveguide are decomposed, and the components of the forward waves in the three directions are respectively...

[0033] S26. Traverse all possibilities of the components of the controllable microwave source in the temperature control zone at the corresponding time step, and couple them with the components of other temperature control zones to obtain the set of optimal electric field intensity components that satisfy the judgment rules for all grid cells in Col1 and Col2. The total power of the current temperature control zone corresponding to this set is P. j And adjust the microwave power of the controllable microwave source to which the temperature control zone belongs accordingly.

[0034] Preferably, in this invention, the process of optimizing the three-dimensional electromagnetic field model includes:

[0035] The mesh is a tetrahedral mesh or a hexahedral mesh.

[0036] Preferably, in this invention, the increase in the material feed rate is a preset percentage of the feed rate before the last update, and the preset percentage includes:

[0037] 0.1% to 5%.

[0038] Preferably, in this invention, the three-dimensional electromagnetic field model is meshed, which includes a Lagrange mesh, and this includes:

[0039] In step S14:

[0040] The preset time step is calculated by analogy between the material feed rate and the node displacement of the entire grid; and the preset time step is less than the maximum time step when the process induces the hot spot effect;

[0041] The simulation results of the three-dimensional electromagnetic field model are calculated based on the input parameters, including the new coordinates of each grid node after displacement after one time step and the predicted temperature values ​​of each temperature control zone.

[0042] In step S15: An upper limit and a lower limit for the deviation of the predicted temperature value are preset. Step S15 includes: determining whether each temperature control zone includes a grid exceeding the target temperature range based on the predicted temperature value of each temperature control zone; if so, and the deviation exceeds the lower limit, adjusting the microwave power of the controllable microwave source for the grid exceeding the target temperature range according to preset rules, using the adjusted microwave power as the current microwave power, and returning to step S14; if not, or the deviation exceeds the upper limit, increasing the material feeding rate and returning to step S14.

[0043] In another aspect of the present invention, a device for accelerating biomass microwave pyrolysis process is also provided, comprising:

[0044] The 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.

[0045] The partitioning unit is used to divide the inner cavity of the microwave reactor into a preset number of temperature control zones according to the three-dimensional electromagnetic field model, and to set the target temperature range for each temperature control zone.

[0046] The parameter acquisition unit is used to acquire the input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feed rate of the biomass.

[0047] 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 values ​​of each temperature control zone after one time step.

[0048] The calculation unit is used to determine whether each temperature control zone includes a grid that exceeds the target temperature range based on the predicted temperature value of each temperature control zone. If so, the microwave power of the controllable microwave source for the grid that exceeds the target temperature range is adjusted according to a preset rule, and the adjusted microwave power of the controllable microwave source is used as the current microwave power. If not, the material feeding rate is increased and updated.

[0049] The instruction generation unit is used to generate the microwave reactor feed rate instruction based on the updated material feed rate.

[0050] Preferably, in this invention, it further includes:

[0051] The callback unit is used to reduce the material feed rate to the value before the last update if, at the current material feed rate, the temperature control zone still includes grids exceeding the target temperature range after a preset number of calculation cycles.

[0052] In another aspect of this invention, a device for accelerating the microwave pyrolysis process of biomass storage 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 method for accelerating the microwave pyrolysis process of biomass 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 method for accelerating the microwave pyrolysis process of biomass as described in any of the preceding claims.

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

[0057] The inventors discovered through research that existing technologies require temperature field control in the later stages of the reaction; otherwise, temperature runaway can easily occur due to hot spot effects. The usual method of temperature control is to establish a constant temperature zone to stabilize the temperature field and regulate the uniformity of material temperature, but this inadvertently affects the processing capacity of reactors of the same size.

[0058] Based on the above understanding, this invention divides the cavity of the microwave reactor into multiple temperature-controlled zones according to a three-dimensional electromagnetic field model, and then predicts the temperature value of each temperature-controlled zone (i.e., calculates the predicted temperature value of each temperature-controlled zone after the next time step). In this way, by using the predicted temperature value of each temperature-controlled zone at the next time step, the microwave power of the controllable microwave source in the grid cell whose temperature does not meet the standard is adjusted, thereby avoiding temperature fluctuations in the biomass within the microwave reactor cavity. Simultaneously, to ensure the microwave reactor achieves the optimal feeding rate, in this embodiment of the invention, the feeding rate of the microwave reactor can be gradually increased while ensuring that all temperature-controlled zones do not exceed the standard, thereby effectively improving the processing capacity and efficiency of the microwave reactor.

[0059] Because each temperature control zone in this invention performs independent calculations, the amount of calculation can be effectively reduced, and the calculation efficiency can be effectively improved. This, in turn, can improve the generation efficiency of the final control command. Thus, by improving the response time of the microwave heating biomass microwave pyrolysis process, the temperature control effect of the microwave reactor can be improved, making the heating process of biomass in the microwave reactor cavity more stable and controllable.

[0060] 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

[0061] Figure 1 This is a flowchart illustrating the steps of the method for accelerating the biomass microwave pyrolysis process described in this invention.

[0062] Figure 2 This is a schematic diagram of the structure of the biomass microwave pyrolysis process acceleration device described in this invention;

[0063] Figure 3 This is a schematic diagram of the structure of the biomass microwave pyrolysis process acceleration control device described in this invention. Detailed Implementation

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Example 1

[0069] In order to improve the processing efficiency of microwave reactors by increasing the material feed rate, such as Figure 1 As shown, this embodiment of the invention provides a method for accelerating a biomass microwave pyrolysis process, comprising the following steps:

[0070] 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;

[0071] This invention utilizes three-dimensional electromagnetic field simulation technology to simulate the temperature distribution data within the cavity of a microwave reactor.

[0072] In practical applications, the specific methods for meshing a three-dimensional electromagnetic field model can be as follows:

[0073] Let the internal volume of the microwave reactor be V; and the number of the controllable microwave sources be n.

[0074] Let the power of the i-th controllable microwave source be P. i The total power of the microwave reactor is

[0075] 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 .

[0076] In practical applications, the mesh cells in the embodiments of the present invention can be in the form of tetrahedrons or hexahedrons.

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

[0078] S12. Based on the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into a preset number of temperature control zones, and the target temperature range of each temperature control zone is set respectively.

[0079] In this embodiment of the invention, the inner cavity of the microwave reactor is divided into multiple temperature control zones, the number of which can be selected from 3 to 40. Next, a corresponding target temperature range is set for each temperature control zone. After dividing the inner cavity of the microwave reactor into multiple temperature control zones, the predicted temperature value for each temperature control zone is calculated separately. Therefore, the amount of calculation can be effectively reduced, calculation efficiency can be improved, and thus the temperature control response time can be improved.

[0080] In this embodiment of the invention, the specific method of dividing the temperature control zone into multiple zones can be:

[0081] The inner cavity of the microwave reactor is divided into multiple temperature control zones at equal intervals;

[0082] Alternatively, the microwave reactor cavity can be divided into multiple temperature control zones with the same temperature difference based on the temperature values ​​at various locations within the reactor cavity. For example, each location within the microwave reactor cavity that increases by 100°C can be designated as a temperature control zone.

[0083] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feed rate of the biomass.

[0084] Before simulating the temperature distribution inside the microwave reactor cavity, various input parameters need to be generated for the three-dimensional electromagnetic field model. These parameters may include the initial microwave power of each controllable microwave source in the microwave reactor, the physical properties of the biomass, and the material feed rate.

[0085] For each temperature-controlled zone, its initial microwave power is the current microwave power of each controllable microwave source in that temperature-controlled zone at the beginning of a calculation cycle (i.e., the current time step) when the biomass has just entered.

[0086] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters; the simulation results include the predicted temperature values ​​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 temperature prediction value of each temperature control zone at the next time step at the current time step, that is, to predict the temperature prediction value of each temperature control zone.

[0089] S15. Based on the predicted temperature values ​​of each temperature control zone, determine whether each temperature control zone includes grids that exceed the target temperature range. If yes, adjust the microwave power of the controllable microwave source for grids that exceed the target temperature range according to preset rules, use the adjusted microwave power of the controllable microwave source as the current microwave power, and return to step S14. If no, increase and update the material feeding rate and return to step S14.

[0090] In this embodiment of the invention, it is necessary to determine, at the next time step, whether each temperature control zone includes grid cells that exceed the target temperature range of that temperature control zone. In practical applications, determining whether each temperature control zone includes grid cells that exceed the target temperature range and adjusting the microwave power of the controllable microwave source can be done in parallel or sequentially.

[0091] Preferably, the specific method of this step may include:

[0092] S21. Obtain the current microwave power of each controllable microwave source at the current time step when biomass enters the temperature control zone based on the three-dimensional electromagnetic field model.

[0093] For each temperature control zone, at the beginning of a calculation cycle (i.e., the current time step) when biomass has just entered, the current microwave power of each controllable microwave source in that temperature control zone can be used as a parameter for temperature prediction by the three-dimensional electromagnetic field model.

[0094] S22. Traverse the maximum temperature point of the grid cell in the temperature control zone. If the maximum temperature point exceeds the upper limit of the target temperature range, store the grid cell identifier and temperature data corresponding to the maximum temperature point into the data set Col1.

[0095] To determine whether the temperature control zone includes grid cells that exceed the upper limit of the target temperature range, and to identify which grid cells exceed the upper limit of the target temperature range, this embodiment of the invention employs a traversal approach to determine the maximum temperature point of the grid cells in the temperature control zone. When the maximum temperature point exceeds the upper limit of the target temperature range, the grid cell identifier and temperature data corresponding to the maximum temperature point are stored in the data set Col1. The same determination is then performed on the remaining grid cells to select all grid cells that exceed the upper limit of the target temperature range. In other words, all grid cells whose temperature exceeds the limit (exceeds the upper limit of the target temperature range) in the next time step are selected, and these grid cells are stored in the data set Col1.

[0096] S23. Traverse the minimum temperature point of the grid cell in the temperature control zone. If the minimum temperature point exceeds the lower limit of the target temperature range, store the grid cell identifier and temperature data corresponding to the minimum temperature point into the data set Col2.

[0097] To prevent the biomass from failing to reach the target temperature, this embodiment of the invention also determines whether the temperature control zone includes grid cells below the lower limit of the target temperature range, and identifies which grid cells are below the lower limit of the target temperature range. This embodiment of the invention uses a traversal method to determine the minimum temperature point of the grid cells in the temperature control zone. When the minimum temperature point is lower than the lower limit of the target temperature range, the grid cell identifier and temperature data corresponding to the minimum temperature point are stored in the data set Col2. Then, the same judgment is performed on the remaining grid cells to select all grid cells that are below the lower limit of the target temperature range. In other words, all grid cells whose temperature is below the target temperature range in the next time step are selected, and these grid cells are stored in the data set Col2.

[0098] S24. For the grid cells currently stored in the data set Col1, according to Maxwell's equations for electric field intensity, solve for the controllable electric field intensity component range E of the biomass within the grid cell in the temperature control zone during the remaining residence time, ensuring that the maximum temperature does not exceed the upper limit of the target temperature range. x-j E y-j E z-jFor the grid cells currently stored in the data set Col2, based on Maxwell's equations for electric field intensity, solve for the controllable electric field intensity component range E of the biomass within the grid cell in the temperature-controlled zone during the remaining residence time, ensuring that the minimum temperature is not lower than the lower limit of the target temperature range. x-i E y-i E z-i ;

[0099] Specifically, for a grid cell j in the dataset Col1, assuming it is only irradiated by microwaves along the x-axis, the electric field intensity components along the other two axes are 0. At this time, the maximum temperature of grid cell j during the remaining residence time is equal to the upper limit of the target temperature range. 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 By combining the maximum value and Maxwell's equations, and considering the coordinates of grid element j within the reaction cavity (i.e., the cavity of the microwave reactor), E is established. 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 range of controllable electric field intensity components for grid cell j, where the maximum temperature of the grid cell j within the remaining residence time does not exceed the upper limit of the target temperature range of the temperature zone it is located in.

[0100] For a specific grid cell i in the dataset Col2, assuming it is only irradiated by microwaves along the x-axis, the electric field intensity components along the other two axes are 0. At this point, the minimum temperature of grid cell i during the remaining residence time is equal to the lower limit of the target temperature range. The electric field intensity component along the x-axis at this point is called E. x-i The theoretical minimum value E xj-min Similarly, we can obtain E. y-i E z-i Minimum value E yj-min E zj-min Then, according to E x-i E y-i E z-i By combining the minimum value and Maxwell's equations with the coordinates of grid element i within the reaction chamber, E is established. x-i E y-i E z-i A planar triangular coordinate system (the minimum value of the x-axis of this coordinate system is E) xj-minThe maximum value is the component of the electric field intensity that the microwave source of the temperature control zone can provide at full power on the x-axis (the same applies to the y and z axes). This coordinate system is the range of controllable electric field intensity components for grid cell i during the remaining dwell time, where the minimum temperature does not exceed the lower limit of the target temperature range of the temperature control zone.

[0101] S25. After obtaining the controllable electric field intensity component range of all grid cells in the sets Col1 and Col2, the forward waves transmitted by all controllable microwave sources belonging to the temperature control zone through the matrix waveguide are decomposed, and the components of the forward waves in the three directions are respectively...

[0102] S26. Traverse all possibilities of the components of the controllable microwave source in the temperature control zone at the corresponding time step, and couple them with the components of other temperature control zones to obtain the set of optimal electric field intensity components that satisfy the judgment rules for all grid cells in Col1 and Col2. The total power of the current temperature control zone corresponding to this set is P. j And adjust the microwave power of the controllable microwave source to which the temperature control zone belongs accordingly.

[0103] Specifically, assuming the current time step is t, for the k controllable microwave sources belonging to the current temperature control zone, the components of their forward waves in the three directions are as follows: For a controllable microwave source not belonging to the current temperature control zone, if it is closer to the outlet direction than the current temperature control zone, the components of its forward wave in the three directions are consistent with the components at the current time step t; if it is closer to the inlet direction than the current temperature control zone, the components of its forward wave in the three directions are consistent with the components at the previous time step t-1. In this embodiment of the invention, it is necessary to traverse all possibilities of the components of the controllable microwave source belonging to the current temperature control zone at the current time step t, that is, it is necessary to traverse the E values ​​related to Col1. x-j E y-j E z-j E related to the plane trigonometric coordinate system and Col2 x-i E y-i E z-i The optimal electric field intensity component set is obtained by superimposing all possibilities on the intersection of the planar triangular coordinate system with the components of the forward wave in three directions outside the current temperature control zone. This ensures that the maximum temperature of the cell grid in Col1 does not exceed the upper limit of the target temperature range of its temperature control zone during the remaining dwell time, and simultaneously ensures that the minimum temperature of the cell grid in Col2 does not fall below the lower limit of the target temperature range during the remaining dwell time.

[0104] For all possibilities of the components of the controllable microwave source in the current temperature control zone at the current time step t, For example, the specific method of obtaining it is as follows:

[0105] Let Q be the number of microwave sources belonging to the current temperature control zone. For the set of Q controllable electric field intensity component ranges Q E ={E x-1 E x-2 , ..., E x-Q}, from the first element E x-1 Begin 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 condition. The range of values.

[0106] then, and The method of obtaining and Similarly, I will not go into details here.

[0107] After obtaining the optimal set of electric field intensity components The total power of the current temperature control zone corresponding to this set is P. j And adjust the microwave power of the controllable microwave source corresponding to the current temperature control zone.

[0108] S16. Generate the microwave reactor feed rate command based on the updated material feed rate.

[0109] When all temperature control zones are within the target temperature range grid, a microwave reactor feed rate command can be generated based on the updated material feed rate. This allows for the determination of the optimal feed rate achievable by the actual microwave reactor, provided that all temperature control zones remain within limits. Consequently, the reactor's capacity can be maximized under controllable temperature conditions, thereby enhancing its processing power.

[0110] To avoid product quality problems caused by excessively high feed rates in the microwave pyrolysis process, this embodiment of the invention may further include the following steps:

[0111] S17. If, at the current material feeding rate, the temperature control zone still includes grids exceeding the target temperature range after a preset number of calculation cycles, the material feeding rate is reduced to the value before the last update.

[0112] In summary, this embodiment of the invention divides the cavity of the microwave reactor into multiple temperature-controlled zones based on a three-dimensional electromagnetic field model, and then predicts the temperature value of each temperature-controlled zone (i.e., calculates the predicted temperature value of each temperature-controlled zone after the next time step). In this way, by using the predicted temperature value of each temperature-controlled zone at the next time step, the microwave power of the controllable microwave source in the grid cell whose temperature does not meet the standard is adjusted, thereby avoiding temperature fluctuations in the biomass within the microwave reactor cavity. Simultaneously, to achieve the optimal feed rate for the microwave reactor, this embodiment of the invention allows for a gradual increase in the feed rate of the microwave reactor, provided that the temperature in each temperature-controlled zone does not exceed the standard, thereby effectively improving the processing capacity and efficiency of the microwave reactor.

[0113] Because each temperature control zone in this invention performs independent calculations, the amount of calculation can be effectively reduced, and the calculation efficiency can be effectively improved. This, in turn, can improve the generation efficiency of the final control command. Thus, by improving the response time of the microwave heating biomass microwave pyrolysis process, the temperature control effect of the microwave reactor can be improved, making the heating process of biomass in the microwave reactor cavity more stable and controllable.

[0114] Example 2

[0115] Furthermore, in this embodiment of the invention, an optimization scheme for a Lagrange mesh scenario is further disclosed when the three-dimensional electromagnetic field model is meshed. Specifically:

[0116] When using a Lagrange grid for meshing:

[0117] Step S14 in Example 1 needs to be adjusted or limited accordingly, specifically:

[0118] The preset time step is determined as follows: the preset time step is calculated by analogy with the displacement of all grid nodes based on the material feed rate; and the preset time step is less than the maximum time step when the hot spot effect is induced by the process.

[0119] The simulation results of the three-dimensional electromagnetic field model calculated based on the input parameters include the new coordinates of each grid node after displacement after one time step and the predicted temperature values ​​of each temperature control zone.

[0120] Next, step S15 in Embodiment 1 needs to be adjusted or limited accordingly, specifically including:

[0121] In step S15: An upper limit and a lower limit for the deviation of the predicted temperature value are preset. Step S15 includes: determining whether each temperature control zone includes a grid exceeding the target temperature range based on the predicted temperature value of each temperature control zone; if so, and the deviation exceeds the lower limit, adjusting the microwave power of the controllable microwave source for the grid exceeding the target temperature range according to preset rules, using the adjusted microwave power as the current microwave power, and returning to step S14; if not, or the deviation exceeds the upper limit, increasing the material feeding rate and returning to step S14.

[0122] Example 3

[0123] In another aspect of this invention, a device for accelerating the microwave pyrolysis process of biomass storage is also provided. Figure 2 This diagram illustrates the structure of a device for accelerating the microwave pyrolysis process of biomass provided in an embodiment of the present invention. The device for accelerating the microwave pyrolysis process of biomass is... Figure 1 The device corresponding to the method for accelerating the microwave pyrolysis process of biomass described in the corresponding embodiment is implemented through a virtual device. Figure 1 In the corresponding embodiment of the method for accelerating the microwave pyrolysis process of biomass, each virtual module constituting the device for accelerating the microwave pyrolysis process of biomass can be executed by electronic devices, such as network devices, terminal devices, or servers. The device for accelerating the microwave pyrolysis process of biomass in this embodiment can achieve the acceleration of the microwave pyrolysis process of biomass required for industrial control. Specifically, the device for accelerating the microwave pyrolysis process of biomass in this embodiment includes:

[0124] 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.

[0125] Partitioning unit 02 is used to divide the inner cavity of the microwave reactor into a preset number of temperature control zones according to the three-dimensional electromagnetic field model, and to set the target temperature range for each temperature control zone.

[0126] The parameter acquisition unit 03 is used to acquire the input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feeding rate of the biomass.

[0127] 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 values ​​of each temperature control zone after one time step.

[0128] The calculation unit 05 is used to determine whether each temperature control zone includes a grid that exceeds the target temperature range based on the predicted temperature value of each temperature control zone. If so, the microwave power of the controllable microwave source for the grid that exceeds the target temperature range is adjusted according to a preset rule, and the adjusted microwave power of the controllable microwave source is used as the current microwave power. If not, the material feeding rate is increased and updated.

[0129] The instruction generation unit 06 is used to generate the microwave reactor feed rate instruction based on the updated material feed rate.

[0130] Preferably, in embodiments of the present invention, it may further include:

[0131] The callback unit (not shown in the figure) is used to reduce the material feed rate to the value before the last update if, at the current material feed rate, the temperature control zone still includes grids that exceed the target temperature range after a preset number of calculation cycles.

[0132] Since the working principle and beneficial effects of the biomass microwave pyrolysis process acceleration device in the embodiments of the present invention have already been demonstrated, Figure 1 The corresponding methods for accelerating the biomass microwave pyrolysis process are also described and explained, so they can be referenced together and will not be repeated here.

[0133] Example 4

[0134] Corresponding to the above method embodiments, this application also provides a device for accelerating the microwave pyrolysis process of biomass storage, 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.

[0135] An example diagram of the hardware structure block diagram of the biomass microwave pyrolysis process acceleration device provided in this embodiment of the invention is shown below. Figure 3 As shown, it may include:

[0136] Processor 1, communication interface 2, memory 3, and communication bus 4;

[0137] The processor 1, communication interface 2, and memory 3 communicate with each other via communication bus 4.

[0138] Optionally, communication interface 2 can be an interface of a communication module, such as the interface of a GSM module;

[0139] 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.

[0140] Memory 3 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0141] Specifically, processor 1 is used to execute the computer program stored in memory 3 to perform the following steps:

[0142] 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;

[0143] S12. Based on the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into a preset number of temperature control zones, and the target temperature range of each temperature control zone is set respectively.

[0144] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feed rate of the biomass.

[0145] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters; the simulation results include the predicted temperature values ​​of each temperature control zone after one time step.

[0146] S15. Based on the predicted temperature values ​​of each temperature control zone, determine whether each temperature control zone includes grids that exceed the target temperature range. If yes, adjust the microwave power of the controllable microwave source for grids that exceed the target temperature range according to preset rules, use the adjusted microwave power of the controllable microwave source as the current microwave power, and return to step S14. If no, increase and update the material feeding rate and return to step S14.

[0147] S16. Generate the microwave reactor feed rate command based on the updated material feed rate.

[0148] Preferably, in embodiments of the present invention, it may further include:

[0149] S17. If, at the current material feeding rate, the temperature control zone still includes grids exceeding the target temperature range after a preset number of calculation cycles, the material feeding rate is reduced to the value before the last update.

[0150] The microwave pyrolysis process acceleration device for biomass 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 pyrolysis process acceleration method for biomass described in the above aspects and achieve the same technical effect.

[0151] Example 5

[0152] 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:

[0153] 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;

[0154] S12. Based on the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into a preset number of temperature control zones, and the target temperature range of each temperature control zone is set respectively.

[0155] S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feed rate of the biomass.

[0156] S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters; the simulation results include the predicted temperature values ​​of each temperature control zone after one time step.

[0157] S15. Based on the predicted temperature values ​​of each temperature control zone, determine whether each temperature control zone includes grids that exceed the target temperature range. If yes, adjust the microwave power of the controllable microwave source for grids that exceed the target temperature range according to preset rules, use the adjusted microwave power of the controllable microwave source as the current microwave power, and return to step S14. If no, increase and update the material feeding rate and return to step S14.

[0158] S16. Generate the microwave reactor feed rate command based on the updated material feed rate.

[0159] Preferably, in embodiments of the present invention, it may further include:

[0160] S17. If, at the current material feeding rate, the temperature control zone still includes grids exceeding the target temperature range after a preset number of calculation cycles, the material feeding rate is reduced to the value before the last update.

[0161] Optionally, the refined and extended functions of the program can be found in the description above.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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 accelerating the microwave pyrolysis process of biomass, characterized in that, 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, including: Let the internal volume of the microwave reactor be V; and the number of controllable microwave sources be n. Let the power of the i-th controllable microwave source be P. i The total power of the microwave reactor is ; 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 ; S12. Based on the three-dimensional electromagnetic field model, the inner cavity of the microwave reactor is divided into a preset number of temperature control zones, and the target temperature range of each temperature control zone is set respectively. S13. Obtain the input parameters of the three-dimensional electromagnetic field model, including: the initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feed rate of the biomass. S14. Using a preset time step as the calculation period, calculate the simulation results of the three-dimensional electromagnetic field model based on the input parameters; the simulation results include the predicted temperature values ​​of each temperature control zone after one time step. S15. Based on the predicted temperature values ​​of each temperature control zone, determine whether each temperature control zone includes grids that exceed the target temperature range. If yes, adjust the microwave power of the controllable microwave source for grids that exceed the target temperature range according to preset rules, use the adjusted microwave power of the controllable microwave source as the current microwave power, and return to step S14. If no, increase and update the material feeding rate and return to step S14. The step of determining whether each temperature control zone includes a grid exceeding the target temperature range based on the predicted temperature value of each temperature control zone, and adjusting the microwave power of the controllable microwave source for the grid exceeding the target temperature range according to a preset rule, includes: Perform the following steps for each of the temperature control zones: S21. Obtain the current microwave power of each controllable microwave source at the first time step when the biomass enters the temperature control zone according to the three-dimensional electromagnetic field model; S22. Traverse the maximum temperature point of the grid cell in the temperature control zone. If the maximum temperature point exceeds the upper limit of the target temperature range, store the grid cell identifier and temperature data corresponding to the maximum temperature point into the data set Col1. S23. Traverse the minimum temperature point of the grid cell in the temperature control zone. If the minimum temperature point exceeds the lower limit of the target temperature range, store the grid cell identifier and temperature data corresponding to the minimum temperature point into the data set Col2. S24. For the grid cells currently stored in the data set Col1, according to Maxwell's equations for electric field intensity, solve for the range of controllable electric field intensity components within the grid cell where the maximum temperature of the biomass in the temperature-controlled zone during the remaining residence time does not exceed the upper limit of the target temperature range. E x-j , E y-j， E z-j For the grid cells currently stored in the data set Col2, based on Maxwell's equations for electric field intensity, solve for the range of controllable electric field intensity components within the grid cell to ensure that the minimum temperature of the biomass in the temperature-controlled zone during the remaining residence time is not lower than the lower limit of the target temperature range. E x-i , E y-i , E z-i ; S25. After obtaining the controllable electric field intensity component range of all grid cells in the sets Col1 and Col2, the forward waves transmitted by all controllable microwave sources belonging to the temperature control zone through the matrix waveguide are decomposed, and the components of the forward waves in the three directions are respectively... ; S26. Traverse all possibilities of the components of the controllable microwave source in the temperature control zone at the corresponding time step, and couple them with the components of other temperature control zones to obtain the set of optimal electric field intensity components that satisfy the judgment rules for all grid cells in Col1 and Col2. The total power of the current temperature control zone corresponding to this set is P. j And adjust the microwave power of the controllable microwave source to which the temperature control zone belongs accordingly; S16. Generate the microwave reactor feed rate command based on the updated material feed rate.

2. The method for accelerating the biomass microwave pyrolysis process according to claim 1, characterized in that, Also includes: S17. If, at the current material feeding rate, the temperature control zone still includes grids exceeding the target temperature range after a preset number of calculation cycles, the material feeding rate is reduced to the value before the last update.

3. The method for accelerating the biomass microwave pyrolysis process according to claim 1, characterized in that, The preset number includes: 3 to 40.

4. The method for accelerating the biomass microwave pyrolysis process according to claim 1, characterized in that, The step of dividing the inner cavity of the microwave reactor into a predetermined number of temperature-controlled zones includes: The microwave reactor's interior is divided into a predetermined number of temperature control zones of equal length, or, based on the heating curve, the microwave reactor's interior is divided into a predetermined number of temperature control zones with the same temperature difference.

5. The method for accelerating the biomass microwave pyrolysis process according to any one of claims 1 to 4, characterized in that, The meshing of the three-dimensional electromagnetic field model includes: The mesh is a tetrahedral mesh or a hexahedral mesh.

6. The method for accelerating the biomass microwave pyrolysis process according to any one of claims 1 to 4, characterized in that, The increase in the material feed rate is a preset percentage of the feed rate before the last update, whereby the preset percentage includes: 0.1% to 5%.

7. The method for accelerating the biomass microwave pyrolysis process according to any one of claims 1 to 4, characterized in that, The three-dimensional electromagnetic field model is meshed, including a Lagrange mesh, which includes: In step S14: The preset time step is calculated by analogy between the material feed rate and the node displacement of the entire grid; and the preset time step is less than the maximum time step when the process induces the hot spot effect; The simulation results of the three-dimensional electromagnetic field model are calculated based on the input parameters, including the new coordinates of each grid node after displacement after one time step and the predicted temperature values ​​of each temperature control zone. In step S15: An upper limit and a lower limit for the deviation of the predicted temperature value are preset. Step S15 includes: determining whether each temperature control zone includes a grid exceeding the target temperature range based on the predicted temperature value of each temperature control zone; if so, and the deviation exceeds the lower limit, adjusting the microwave power of the controllable microwave source for the grid exceeding the target temperature range according to preset rules, using the adjusted microwave power as the current microwave power, and returning to step S14; if not, or the deviation exceeds the upper limit, increasing the material feeding rate and returning to step S14.

8. A device for accelerating a biomass microwave pyrolysis process, used to implement the method for accelerating a biomass microwave pyrolysis process as described in any one of claims 1-7, characterized in that, include: The 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 partitioning unit is used to divide the inner cavity of the microwave reactor into a preset number of temperature control zones according to the three-dimensional electromagnetic field model, and to set the target temperature 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 initial microwave power of each controllable microwave source in the microwave reactor, and the physical property parameters and material feed rate of the biomass. 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 values ​​of each temperature control zone after one time step. The calculation unit is used to determine whether each temperature control zone includes a grid that exceeds the target temperature range based on the predicted temperature value of each temperature control zone. If so, the microwave power of the controllable microwave source for the grid that exceeds the target temperature range is adjusted according to a preset rule, and the adjusted microwave power of the controllable microwave source is used as the current microwave power. If not, the material feeding rate is increased and updated. The instruction generation unit is used to generate the microwave reactor feed rate instruction based on the updated material feed rate.

9. The biomass microwave pyrolysis process acceleration device according to claim 8, characterized in that, Also includes: The callback unit is used to reduce the material feed rate to the value before the last update if, at the current material feed rate, the temperature control zone still includes grids exceeding the target temperature range after a preset number of calculation cycles.

10. A device for accelerating biomass microwave pyrolysis process, 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 method for accelerating the biomass microwave pyrolysis process as described in any one of claims 1-7.

11. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the various steps of the method for accelerating the biomass microwave pyrolysis process as described in any one of claims 1-7.

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