A method for designing a structure of a multidirectional gradient pore size reaction carrier
By designing a multi-directional gradient pore size reaction carrier using implicit trigonometric functions, the problem of low catalyst utilization in hydrogen production microreactors was solved, achieving high specific surface area and controllable reactant flow direction, thus improving hydrogen production efficiency.
Patent Information
- Application Number
- CN202411928927.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2044-12-25
AI Technical Summary
Existing hydrogen production microreactors have a high specific surface area but the flow direction of the reactants cannot be controlled, resulting in the incomplete utilization of the catalyst.
An implicit trigonometric function was used to design a multi-directional gradient pore size reaction carrier. By adjusting the parameters, a smooth, fully enclosed, high-porosity porous structure was constructed to achieve controllable reaction flow direction. The reaction carrier was made of CuSn10 material with a diameter of 16×16×16mm. The gradient pore size structure allows the reactants to flow through the large pores first and then through the small pores to increase the contact rate.
This achieves a combination of high specific surface area and controllable reactive flow direction, improving the utilization rate of hydrogen production catalysts and hydrogen production performance.
Smart Images
Figure CN119849160B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of hydrogen production, in particular to a structure design method of a multi-directional gradient-pore reaction carrier. BACKGROUND
[0002] Hydrogen energy, as a high-efficiency clean secondary energy, plays an important role in the future development of the energy industry.
[0003] In the micro-reactor hydrogen production technology, the micro-reactor has the advantages of strong heat and mass transfer capacity, rapid integration and amplification, high safety and the like, so that the micro-reactor becomes an important development direction of the hydrogen production technology. In the design of the hydrogen production micro-reactor catalytic reaction carrier, the traditional catalytic reaction carrier with high specific surface area can have higher porosity under the same volume, so as to load more catalysts and achieve good hydrogen production performance, but the complex and disordered flow channel inside the catalytic reaction carrier cannot control the flow direction of the reactants, so that the catalysts cannot be fully utilized.
[0004] To solve the above problems, a gradient-pore hydrogen production reaction carrier with high specific surface area and controllable reactant flow direction is needed. SUMMARY
[0005] The application provides a structure design method of a multi-directional gradient-pore reaction carrier, which can make the designed gradient-porous structure have the performance of high specific surface area and controllable reactant flow direction, and be better applied to a hydrogen production catalytic reaction carrier.
[0006] The application adopts the following technical scheme.
[0007] A structure design method of a multi-directional gradient-pore reaction carrier, the method first designs a porous reaction carrier based on an implicit trigonometric function, the implicit trigonometric function constructs a porous structure of a porous reaction carrier model by describing all points on an equivalent surface of the carrier, and the porous structure has the characteristics of smoothness, full closure and high porosity; then the method adjusts parameters in the implicit trigonometric function, establishes the association between the porous structure pore diameter control parameters and the spatial coordinate position, thereby constructing a gradient-pore reaction carrier of the carrier model, changes the modeling parameters, and records the porosity and gradient rate of the gradient-pore reaction carrier under different parameters, so as to analyze the influence relationship between the model geometric properties and the modeling parameters, and modify the parameters of the implicit trigonometric function to realize the construction of the gradient-pore reaction carrier, that is, to obtain the reaction carriers with different pore diameter gradients by changing the parameters.
[0008] The average curvature of all points on the surface of the porous reaction carrier model is 0.
[0009] The porous reaction carrier is a hydrogen production reaction carrier, which has the characteristics of high specific surface area and the performance of controllable reactant flow direction.
[0010] The implicit trigonometric function is run by a program module based on Rhino software.
[0011] The structural design method comprises the following steps:
[0012] Step S1: Building a program module based on implicit trigonometric function modeling in Rhino software, testing the functions and setting parameters of each module;
[0013] Step S2: Generating four kinds of porous structure models of Gyroid, Diamond, Primitive and I-WP based on implicit trigonometric function in Rhino software, and respectively counting the specific surface area of the four kinds of porous structure models under the same constraint condition;
[0014] Step S3: The porous structure model with the largest specific surface area among the four kinds of porous structure models generated by implicit trigonometric function is used for subsequent gradient pore size reaction carrier structure design.
[0015] In step S1, the implicit trigonometric function for constructing the porous reaction carrier is first selected; then the shape size and the number of unit cells contained in the model are determined, and the related parameters are set in the Grasshopper plug-in of Rhinoceros 7.4 software.
[0016] In step S2, the implicit trigonometric function is four, corresponding to the four kinds of porous structure models of Gyroid, Diamond, Primitive and I-WP;
[0017] The implicit trigonometric function corresponding to Gyroid is:
[0018] The implicit trigonometric function corresponding to Diamond is:
[0019] The implicit trigonometric function corresponding to Primitive is:
[0020] The implicit trigonometric function corresponding to I-WP is: In the above implicit trigonometric function, the C value in the function represents a constant, and different porosity porous structures are obtained by changing the C value.
[0021] In step S2, the grid model of the gradient porous reaction carrier is generated by the built-in plug-in in the Grasshopper plug-in, the outer size of the model is controlled to be 2*2*2 mm, and the minimum pore size of each model is 0.5 mm. Four implicit trigonometric functions are respectively input into the modeling program to generate the corresponding models, and the specific surface area of each model is calculated by measuring the surface area and volume of the model. The models and specific surface areas constructed by the four implicit trigonometric functions are shown in Table 2.
[0022] In step S3, if the porous structure model with the maximum specific surface area in the four porous structure models is the I-WP type porous structure model, a functional relationship between the C value and the corresponding coordinate axis of the gradient direction is established on the basis of the implicit trigonometric function, and the design scheme of the gradient pore size is realized by changing the parameter value of the implicit trigonometric function. Specifically, the C value is converted into a one-variable first-order function, and in the function expression constituted by the C value, the parameter A is used to control the pore size and pore size gradient of the model, and the parameter T is used to assist in controlling the pore size of the model. By changing the parameters A and T, the porous carrier structure with a specific pore size gradient is designed, and a gradient pore size reaction carrier model is formed.
[0023] The implicit trigonometric functions corresponding to the gradient pore size reaction carrier model in each direction are as follows:
[0024] When there is no gradient direction, the implicit trigonometric function is When the gradient direction is X direction, the implicit trigonometric function is
[0025]
[0026] When the gradient direction is Y direction, the implicit trigonometric function is
[0027]
[0028] When the gradient direction is Z direction, the implicit trigonometric function is
[0029]
[0030] When the gradient direction is xy direction, the implicit trigonometric function is
[0031]
[0032] When the gradient direction is xz direction, the implicit trigonometric function is
[0033]
[0034] When the gradient direction is yz direction, the implicit trigonometric function is
[0035]
[0036] When the gradient direction is three-direction, the implicit trigonometric function is
[0037]
[0038] In step S3, if the porous structure model with the maximum specific surface area among the four porous structure models is the I-WP type porous structure model, and the multi-directional gradient pore size reaction carrier is used for hydrogen production in a microreactor, then the designed multi-directional gradient pore size reaction carrier is prepared by using CuSn10 material to form a reaction carrier with a size of 16x16x16mm, and is assembled with a hydrogen production reaction cavity through a clearance fit. In the hydrogen production reaction, the reactants flow through large pores first to achieve sufficient diffusion, and then flow out through small pores to increase the contact probability of the reactants.
[0039] In the modeling, the gradient rate of the built multi-directional gradient pore size reaction carrier model is ensured to be 1.5%, the total porosity of the model is 68.50%, and the size of the model is 16x16x16mm. Since the reaction requirements of the porous structure body, the pore size gradient in the X direction of the designed gradient pore size reaction carrier model is a single-sided gradient, and the pore size gradients in the Y and Z directions are two-sided gradients. In the function of each gradient direction, the function parameters related to the pore sizes in the Y and Z directions are assigned with absolute values.
[0040] According to the problems existing in the structure of the existing hydrogen production catalyst reaction carrier, the present application proposes a gradient porous structure design method based on implicit trigonometric functions, which can make the designed gradient porous structure have the performance of high specific surface area and controllable reactant flow direction, and better apply to the hydrogen production catalyst reaction carrier.
[0041] The present application is a porous structure for hydrogen production, which is used to ensure the multi-directional regulation of the flow distribution of the reactants in the hydrogen production reaction, and to realize the efficient utilization of the hydrogen production reaction catalyst.
[0042] The application discloses a structural design method of a multi-directional gradient pore diameter hydrogen production reaction carrier, which adopts CuSn10 material to manufacture a reaction carrier with a size of 16*16*16mm, and is assembled with a hydrogen production reaction cavity through a clearance fit. The carrier is designed with a gradient pore diameter structure, so that the reactants flow through large pores in the hydrogen production process to realize sufficient diffusion, and then flow out through small pores to increase the contact probability of the reactants. The gradient form design aims to control the flow distribution of the reactants in multiple directions, and effectively improves the utilization rate of the hydrogen production reaction catalyst. The application comprises the following steps: 1. building a program module based on an implicit trigonometric function modeling in Rhino software, and introducing the functions and parameter setting results of the modules; 2. building four kinds of porous structure models of Gyroid, Diamond, Primitive and I-WP type based on the implicit trigonometric function in the Rhino software, and respectively counting the specific surface areas of the four kinds of porous structure models under the same constraint condition; and 3. selecting the I-WP type with the largest specific surface area among the four kinds of porous structure models to design a gradient structure. The application establishes a function relationship between the C value of the implicit trigonometric function and the corresponding coordinate axis of the gradient direction, and realizes the gradient structure design of the model by changing the parameter value of the implicit trigonometric function. The application proves that the structural design of the gradient pore diameter hydrogen production reaction carrier based on the implicit trigonometric function can be realized by modifying the implicit trigonometric function, and can provide a new idea for subsequent gradient model modeling.
[0043] Compared with the prior art, the application provides a novel gradient pore diameter reaction carrier structural design method suitable for hydrogen production, and has the following beneficial effects: the application designs the porous reaction carrier on the basis of the implicit trigonometric function, the trigonometric function can describe all points on a certain value surface, so that a porous structure body can be constructed, and the average curvature of all points on the surface of the porous reaction carrier model generated by the implicit trigonometric function is 0. On the basis of the implicit trigonometric function, the correlation between the pore diameter control parameter and the spatial coordinate position is established by adjusting the parameter in the implicit trigonometric function, so that the gradient pore diameter reaction carrier is constructed. The porosity and gradient rate of the gradient pore diameter reaction carrier under different parameters are recorded by changing the modeling parameters, so as to explore the influence relationship between the geometric properties of the model and the modeling parameters. The results show that the construction of the gradient pore diameter reaction carrier can be realized by modifying the parameters of the implicit function, and different pore diameter gradients of the reaction carrier can be obtained by changing the parameters, so that the reaction carrier has the performances of high specific surface area and controllable reactant flow direction when used as a hydrogen production reaction carrier. BRIEF DESCRIPTION OF DRAWINGS
[0044] The application will be further described in detail in combination with the drawings and specific embodiments:
[0045] ATTACHMENT Figure 1is the overall visual programming schematic diagram of the Grasshopper plug-in in the operation process of the Rhino software of the embodiment of the present application;
[0046] attached Figure 2 is the basic structure control module schematic diagram of the model of the embodiment Figure 2 (a) of is to control the length, width and height dimensions of the model Figure 2 (b) of is to control the number of unit cells of the model
[0047] attached Figure 3 is the data processing module schematic diagram of the embodiment Figure 3 (a) of is the Range operator Figure 3 (b) of is the Cross Reference operator
[0048] attached Figure 4 is the space point generation and coordinate conversion module schematic diagram of the embodiment Figure 4 (a) of is to respectively assign X and Y coordinates to the data after cross operation, and to assign Z coordinates to the data after equidistant division processing, so that the data after cross operation form coordinate points in space through the assigned coordinates Figure 4 (b) of is to convert each coordinate point into a coordinate of the Cartesian coordinate system
[0049] attached Figure 5 is the mesh generation module schematic diagram of the embodiment
[0050] attached Figure 6 is the mesh softening module schematic diagram of the embodiment
[0051] attached Figure 7 is the mesh thickening module schematic diagram of the embodiment
[0052] attached Figure 8 is the mesh scaling module schematic diagram of the embodiment
[0053] attached Figure 9 is the output module schematic diagram of the embodiment DETAILED DESCRIPTION
[0054] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings, and the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0055] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.
[0056] As shown in the figure, a structural design method of a multidirectional gradient pore diameter reaction carrier, the method first designs a porous reaction carrier based on an implicit trigonometric function, the implicit trigonometric function constructs a porous structure of a porous reaction carrier model by describing all points on the equivalent surface of the carrier, the porous structure has the characteristics of smoothness, full closure and high porosity, then by adjusting the parameters in the implicit trigonometric function, the association between the pore diameter control parameters of the carrier model and the spatial coordinate position is established, thereby constructing a gradient pore diameter reaction carrier of the carrier model, and by changing the modeling parameters and recording the porosity and gradient rate of the gradient pore diameter reaction carrier under different parameters, the influence relationship between the geometric properties of the model and the modeling parameters is analyzed, and the construction of the gradient pore diameter reaction carrier is realized by modifying the parameters of the implicit trigonometric function, that is, different pore diameter gradients of the reaction carrier are obtained by changing the parameters.
[0057] The average curvature of all points on the surface of the porous reaction carrier model is 0.
[0058] The porous reaction carrier is a hydrogen production reaction carrier, which has the characteristics of high specific surface area and controllable reactant flow.
[0059] The implicit trigonometric function is run based on a program module of Rhino software.
[0060] The structural design method comprises the following steps:
[0061] Step S1: Building a program module based on implicit trigonometric function modeling in Rhino software, testing the functions and setting parameters of each module;
[0062] Step S2: Generating four kinds of porous structure models of Gyroid, Diamond, Primitive and I-WP based on implicit trigonometric function in Rhino software, and respectively counting the specific surface area of the four kinds of porous structure models under the same constraint condition;
[0063] Step S3: The largest specific surface area of the four kinds of porous structure models generated by the implicit trigonometric function is used for subsequent structural design of the gradient pore diameter reaction carrier.
[0064] In step S1, the implicit trigonometric function for constructing the porous reaction carrier is first selected; then the size of the model and the number of unit cells contained are determined, and the related parameters are set in the Grasshopper plug-in of Rhinoceros 7.4 software.
[0065] In step S2, the implicit trigonometric function is four, corresponding to the four kinds of porous structure models of Gyroid, Diamond, Primitive and I-WP;
[0066] The implicit trigonometric function corresponding to Gyroid is:
[0067] The implicit trigonometric function corresponding to Diamond is:
[0068] The implicit trigonometric function corresponding to Primitive is:
[0069] The implicit trigonometric function corresponding to I-WP is: In the above implicit trigonometric functions, the C value in the function represents a constant, and by changing the C value, a porous structure with different porosities can be obtained.
[0070] In step S2, a grid model of the gradient porous reaction carrier is generated by a built-in plug-in in the Grasshopper plug-in, the size of the model is controlled to be 2x2x2mm, and the minimum pore size of each model is 0.5mm. Four implicit trigonometric functions are input into the modeling program to generate the corresponding models, and the specific surface area of each model is calculated by measuring the surface area and volume of the model. The models and specific surface areas constructed by the four implicit trigonometric functions are shown in Table 2.
[0071] In step S3, if the porous structure model with the largest specific surface area among the four porous structure models is from the I-WP type porous structure model, a functional relationship between the C value and the corresponding coordinate axis in the gradient direction is established based on the implicit trigonometric function, and the design scheme of the gradient pore size is realized by changing the parameter value of the implicit trigonometric function. Specifically, the C value is converted into a first-order function, and in the function expression formed by the C value, the parameter A is used to control the pore size and pore size gradient of the model, and the parameter T is used to assist in controlling the pore size of the model. By changing the parameters A and T, a porous carrier structure with a specific pore size gradient is designed; a gradient pore size reaction carrier model is formed;
[0072] The implicit trigonometric functions corresponding to the gradient pore size reaction carrier model in each direction are as follows:
[0073] When there is no gradient direction, the implicit trigonometric function is When the gradient direction is X, the implicit trigonometric function is
[0074]
[0075] When the gradient direction is Y, the implicit trigonometric function is
[0076]
[0077] When the gradient direction is Z direction, the implicit trigonometric function is
[0078]
[0079] When the gradient direction is xy bidirectional, the implicit trigonometric function is
[0080]
[0081] When the gradient direction is xz bidirectional, the implicit trigonometric function is
[0082]
[0083] When the gradient direction is yz bidirectional, the implicit trigonometric function is
[0084]
[0085] When the gradient direction is three-way, the implicit trigonometric function is
[0086]
[0087] In step S3, if the porous structure model with the largest specific surface area among the four porous structure models is the I-WP type porous structure model, and the multi-directional gradient pore size reaction carrier is used for hydrogen production in a microreactor, then the designed multi-directional gradient pore size reaction carrier is prepared by using CuSn10 material to form a reaction carrier with a size of 16x16x16mm, which is assembled with the hydrogen production reaction cavity through clearance fit. In the hydrogen production reaction, the reactants first flow through the large pores to achieve sufficient diffusion, and then flow out through the small pores to increase the probability of reactant contact.
[0088] In modeling, the gradient rate of the built multi-directional gradient pore size reaction carrier model is ensured to be 1.5%, the total porosity of the model is 68.50%, and the model size is 16x16x16mm. Since according to the reaction requirements of the porous structure, the pore size gradient in the X direction of the designed gradient pore size reaction carrier model is a single-sided gradient, and the pore size gradients in the Y and Z directions are two-sided gradients, the function parameters related to the Y and Z direction pore sizes in the function of each gradient direction are assigned with absolute values.
[0089] Embodiment:
[0090] In this example, the following steps are included:
[0091] Step 1, the implicit trigonometric function is introduced into the Grasshopper plug-in of Rhinoceros 7.4 (Robert McNeel & Assoc, USA) software to build the modeling program module; wherein the Grasshopper plug-in of the rhinoceros software is the overall visual programming diagram, as shown in Figure 1 ; Figure 2 The basic structure control module of the model, the basic structure parameters of the model are controlled by the change of its parameters; wherein Figure 2 (a) controls the length, width and height of the model; Figure 2 (b) controls the number of unit cells of the model; Figure 3 Data processing module; wherein Figure 3 (a) is a Range operator, which is used to divide the numerical interval determined by the model unit cell number equally, the more the number of division, the higher the final forming precision of the grid model; Figure 3 (b) is a Cross Reference operator, which performs cross operation on the divided numerical interval data and the modeling size data through multiplication operation; Figure 4 Space point generation and coordinate conversion module; wherein Figure 4 (a) is the data after cross operation respectively assigned X, Y coordinates, and the data after equal interval division processing is assigned Z coordinate, through the assigned coordinates, the data after cross operation forms the coordinate points in space. Figure 4 (b) is the coordinate of each coordinate point converted to Cartesian coordinate system. Figure 5 Grid generation module, input the Cartesian coordinates of each point into the implicit trigonometric function to extract the isosurface through the cubic algorithm to finally generate the grid of porous structure. Figure 6 Grid softening module, the softening level of the grid is adjusted by assigning the number of iterations. Figure 7 Grid thickening module, the generated porous structure grid can be thickened by assigning thickness. Figure 8 Grid scaling module, the required porous structure grid can be obtained by assigning the scaling factor. Figure 9 Output module, this module can assign color to the porous structure grid.
[0092] Step 2: The basic steps of structural design of four kinds of porous reaction carriers based on implicit trigonometric functions described in the application: ① Select the implicit trigonometric function for constructing the porous reaction carrier; ② Determine the size and the number of unit cells of the model, and set the relevant parameters in the Grasshopper plug-in of Rhinoceros 7.4 software; ③ Generate a gradient porous reaction carrier grid model through the built-in plug-in in the Grasshopper plug-in; ④ Process the generated gradient porous reaction carrier grid model for softening, thickening, equal scaling, etc.; ⑤ Export the grid model and complete the conversion of the grid and the surface to complete the modeling. The implicit trigonometric function modeling formulas of the four models are shown in Table 1.
[0093] Table 1: Four implicit trigonometric functions and their corresponding model names
[0094]
[0095] In constructing the four basic implicit trigonometric function models, the C value in the function represents a constant, and different porous structures with different porosities can be obtained by changing the C value. The size of the model is controlled to be 2x2x2mm, and the minimum pore size of each model is 0.5mm. The four implicit trigonometric functions are input into the modeling program to generate the corresponding models, and the specific surface area of each model is calculated by measuring the surface area and volume of the model. The models and specific surface areas of the four implicit trigonometric functions are shown in Table 2.
[0096] Table 2: Models and specific surface areas of four implicit trigonometric functions
[0097]
[0098] Table 2 is the model and specific surface area of the four implicit trigonometric functions. As can be seen from Table 2, compared with other implicit trigonometric functions, the I-WP type implicit trigonometric function has a higher specific surface area. The porous structure has a high specific surface area, which can make it have a higher catalyst loading area and a higher mass and heat transfer capacity, thereby having higher hydrogen production performance. Therefore, the I-WP type implicit trigonometric function is used for subsequent design and research of gradient pore reaction carriers.
[0099] Step 3: The structure design of the subsequent gradient pore reaction carrier was carried out using I-WP type. The function relationship between C value and the corresponding coordinate axis of the gradient direction was established on the basis of implicit trigonometric function, and the design scheme of gradient pore was realized by changing the parameter value of implicit trigonometric function. As shown in Table 3, the C value was converted into a unary function, and in the function expression constituted by the C value, the parameter A was used to control the pore size and pore gradient of the model, and the parameter T was used to assist the control of the pore size of the model. By changing the parameters A and T, the structure design of the porous carrier with specific pore gradient was realized. The implicit trigonometric function of the I-WP type reaction carrier in each gradient direction is shown in Table 3. Among them, the design ideas of Y and Z one-way gradient models are consistent, so the common implicit trigonometric function is used for modeling.
[0100] Table 3 Implicit trigonometric function corresponding to each direction gradient pore reaction carrier model
[0101]
[0102] In the modeling, the gradient rate of the built each direction gradient pore reaction carrier model was ensured to be 1.5%, the total porosity of the model was 68.50%, and the model size was 16x16x16mm. Since according to the reaction requirements of the porous structure, the pore gradient of the X direction of the designed gradient pore reaction carrier model is unilateral gradient, and the pore gradient of the Y and Z directions is two-sided gradient, in the function of each gradient direction, the function parameters related to the Y and Z direction pores are assigned with absolute value. The I-WP type each direction gradient pore reaction carrier model is shown in Table 3.
[0103] Table 3 I-WP type each direction gradient pore reaction carrier model
[0104] In summary, in this example, on the basis of four classical implicit trigonometric functions, the I-WP type implicit trigonometric function model with larger specific surface area was finally selected for gradient pore modeling through the screening of specific surface area. Through the modification of the I-WP type implicit trigonometric function, the new type of implicit trigonometric function can construct the reaction carrier of single-direction, double-direction and three-direction gradient pore, and its high specific surface area and controllable reactant flow direction make it can be used as a hydrogen production reaction carrier.
Claims
1. A structural design method for a multi-directional gradient pore size reaction carrier, characterized in that: The method first designs a porous reactive carrier based on implicit trigonometric functions. These implicit trigonometric functions construct the porous structure of the porous reactive carrier model by describing all points on the carrier's isosurface. The porous structure is characterized by smoothness, complete closure, and high porosity. Then, by adjusting the parameters in the implicit trigonometric functions, a relationship is established between the pore size control parameters of the porous structure and the spatial coordinate position, thereby constructing a gradient pore size reactive carrier model. Furthermore, by changing the modeling parameters and recording the porosity and gradient rate of the gradient pore size reactive carrier under different parameters, the influence relationship between the model's geometric properties and the modeling parameters is analyzed. The construction of the gradient pore size reactive carrier is achieved by modifying the parameters of the implicit trigonometric functions, that is, reactive carriers with different pore size gradients are obtained by changing the parameters. The structural design method includes the following steps; Step S1: Build the program module based on implicit trigonometric function modeling in Rhino software, and test the function and setting parameters of each module; Step S2: In Rhino software, generate four porous structure models based on implicit trigonometric functions: Gyroid, Diamond, Primitive, and I-WP. Under the same constraints, calculate the specific surface area of the four porous structure models. Step S3: Design the structure of the subsequent gradient pore size reaction carrier based on the porous structure model with the largest specific surface area among the four porous structure models generated by implicit trigonometric functions. In step S2, there are four types of implicit trigonometric functions, which correspond to the four porous structure models: Gyroid, Diamond, Primitive, and I-WP. The implicit trigonometric functions corresponding to Gyroid are: φ(x,y,z)=sin(πx)cos(πy)+sin(πy)cos(πz)+sin(πz)cos(πx)+C; The implicit trigonometric functions corresponding to Diamond are: φ(x,y,z)=sin(πx)sin(πy)sin(πz)+sin(πx)cos(πy)cos(πz)+cos(πx)sin(πy)cos(πz)+cos(πx)cos(πy)sin(πz)+C; The implicit trigonometric function corresponding to Primitive is: φ(x,y,z)=cos(πx)+cos(πy)+cos(πz)+C; The implicit trigonometric function corresponding to I-WP is: φ(x,y,z)=cos(πx)cos(πy)+cos(πy)cos(πz)+cos(πz)cos(πx)+C; In the above implicit trigonometric function, the value of C in the function represents a constant, and by changing the value of C, porous structures with different porosities can be obtained.
2. The structural design method for a multi-directional gradient pore size reaction carrier according to claim 1, characterized in that: The average curvature of all points on the surface of the porous reactive carrier model is 0.
3. The structural design method for a multi-directional gradient pore size reaction carrier according to claim 2, characterized in that: The porous reaction support is a hydrogen production reaction support, which combines the characteristics of high specific surface area and controllable reaction flow direction.
4. The structural design method for a multi-directional gradient pore size reaction carrier according to claim 1, characterized in that: In step S1, the implicit trigonometric function for constructing the porous reaction support is first selected; then the external dimensions and number of unit cells of the model are determined, and the relevant parameters are set in the Grasshopper plugin of the Rhinoceros software.
5. The structural design method for a multi-directional gradient pore size reaction carrier according to claim 1, characterized in that: In step S2, a grid model of a gradient porous reactive carrier is generated using a built-in plugin in the Grasshopper plugin. The external dimensions of the model are controlled to be 2×2×2mm, and the minimum pore diameter of each model is 0.5mm. Four implicit trigonometric functions are input into the modeling program to generate the corresponding models. The specific surface area of each model is calculated by measuring the surface area and volume of the model.
6. The structural design method for a multi-directional gradient pore size reaction carrier according to claim 1, characterized in that: In step S3, if the porous structure model with the largest specific surface area among the four porous structure models comes from the I-WP type porous structure model, then a functional relationship between the C value and the coordinate axis corresponding to the gradient direction is established based on the implicit trigonometric functions. The gradient pore size design scheme is achieved by changing the parameter values of the implicit trigonometric functions. Specifically, the C value is converted into a linear function in one variable. In the function expression formed by the C value, parameter A is used to control the pore size and pore gradient of the model, and parameter T is used to assist in controlling the pore size of the model. By changing the above parameters A and T, a porous carrier structure design with a specific pore size gradient is achieved, forming a gradient pore size reactive carrier model. The implicit trigonometric functions corresponding to the gradient pore size reactive carrier model in each direction are as follows: When there is no gradient direction, the implicit trigonometric function is φ(r) = cos(πx)cos(πy) + cos(πy)cos(πz) + cos(πz)cos(πx) + T; when the gradient direction is X-axis, the implicit trigonometric function is φ(r) = cos(πx)cos(πy) + cos(πy)cos(πz) + cos(πz)cos(πx) + A1x + T; When the gradient direction is Y, the implicit trigonometric function is φ(r)=cos(πx)cos(π|y|)+cos(π|y|)cos(πz)+cos(πz)cos(πx)+A1|y|+T; When the gradient direction is Z, the implicit trigonometric function is φ(r)=cos(πx)cos(πy)+cos(πy)cos(π|z|)+cos(π|z|)cos(πx)+A1|z|+T; When the gradient direction is bidirectional (x and y), the implicit trigonometric function is φ(r) = cos(πx)cos(π|y|) + cos(π|y|)cos(πz) + cos(πz)cos(πx) + A1x + A2|y| + T; When the gradient direction is bidirectional (x and z), the implicit trigonometric function is φ(r) = cos(πx)cos(π|z|) + cos(πy)cos(π|z|) + cos(π|z|)cos(πx) + A1x + A2|z| + T; When the gradient direction is bidirectional (y-z), the implicit trigonometric function is φ(r) = cos(πx)cos(π|y|) + cos(π|y|)cos(π|z|) + cos(π|z|)cos(πx) + A1|y| + A2|z| + T; When the gradient direction is triaxial, the implicit trigonometric function is φ(r)=cos(πx)cos(π|y|)+cos(π|y|)cos(π|z|)+cos(π|z|)cos(πx)+A1x+A2|y|+A3|z|+T.
7. The structural design method for a multi-directional gradient pore size reaction carrier according to claim 6, characterized in that: In step S3, if the porous structure model with the largest specific surface area among the four porous structure models comes from the I-WP type porous structure model, and the multi-directional gradient pore size reaction carrier is used for hydrogen production in a microreactor, then the designed multi-directional gradient pore size reaction carrier is made of CuSn10 material during preparation. It is assembled with the hydrogen production reaction chamber through gap fitting. In the hydrogen production reaction, the gradient pore size structure allows the reactants to first flow through the large pores to achieve sufficient diffusion, and then flow out through the small pores to increase the contact probability of the reactants.