Vertical winnowing separation CFD-DEM coupling analog simulation method
Through the vertical air-selecting separation CFD-DEM coupled simulation simulation method, the problem of difficulty in separating irregular mixed materials in the existing technology is solved, and more accurate guidance on the lithium battery recycling process is achieved, and process efficiency is improved.
Patent Information
- Application Number
- CN202411991410.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-03-28
AI Technical Summary
The prior art is difficult to effectively separate irregular mixed materials in industrial production, such as copper foil, aluminum foil, plastic film and metal shell, which affects the efficiency of lithium battery recycling process.
The vertical wind-selected separation CFD-DEM coupled simulation simulation method was adopted to construct a three-dimensional simulation model, momentum equation and non-spherical particle drag equation, and gas-solid two-phase flow coupling equation was constructed through coupling, and the results were verified.
The separation simulation of more types of sheet-shaped mixed materials is achieved, more accurate industrial production guidance is provided, and the efficiency of lithium battery recycling process is improved.
Smart Images
Figure CN119720859A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of computer numerical simulation, and in particular to a CFD-DEM coupling simulation method for vertical air separation. Background Art
[0002] In recent years, lithium-ion power batteries have developed rapidly, but with their development, a large number of scrapped lithium batteries to be recycled have also been generated. If waste lithium batteries are disposed of at will, it will cause huge pollution to the environment. Moreover, lithium batteries contain a large amount of metals with recycling value, such as copper, aluminum, nickel, and cobalt. If these waste lithium batteries are recycled, it will bring hundreds of billions of related industrial chains, and at the same time, it can also reduce the dependence on the import of these metals. Therefore, for the recycling of lithium batteries, it is necessary to explore the industrial recycling process.
[0003] The pretreatment process is an important part of lithium battery recycling, which directly affects the subsequent recycling process. In the past, wind separation recycling was mostly for the separation of regular flake materials, but now it is necessary to separate irregular mixed materials in industrial production such as copper foil, aluminum foil, plastic film and metal shell. Summary of the invention
[0004] In view of the above situation, the main purpose of the present invention is to propose a vertical air separation CFD-DEM coupling simulation method and system to solve the above technical problems.
[0005] The present invention provides a vertical air separation CFD-DEM coupling simulation method, the method comprising the following steps: Step 1, obtaining structural data of the vertical air separation device, using the structural data to construct a three-dimensional simulation model, and performing meshing processing on the three-dimensional simulation model to obtain a processed three-dimensional simulation model; Step 2, obtaining processed data based on the processed three-dimensional simulation model, and constructing a momentum equation and a drag equation for non-spherical particles through the processed data; Based on the momentum equation and the drag equation for non-spherical particles, the gas-solid two-phase flow coupling equation is constructed by coupling. Step 3: Use simulation software to simulate the gas-solid two-phase flow coupling equation and obtain visual results; The visualization results are verified using the experimental setup.
[0006] The present invention also proposes a vertical air separation CFD-DEM coupling simulation system, the system comprising: Model building modules for: Acquire structural data of the vertical air separation device, construct a three-dimensional simulation model using the structural data, perform meshing processing on the three-dimensional simulation model, and obtain a processed three-dimensional simulation model; Equation solving modules for: Obtain processed data based on the processed three-dimensional simulation model, and construct momentum equations and non-spherical particle drag equations through the processed data; Based on the momentum equation and the drag equation for non-spherical particles, the gas-solid two-phase flow coupling equation is constructed by coupling. Experimental verification module for: Use simulation software to simulate the gas-solid two-phase flow coupling equation and obtain visual results; The visualization results are verified using the experimental setup.
[0007] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can simulate the separation of more types of flaky mixed materials by using CFD-DEM coupling to simulate, enrich the simulation data, and make the simulation process and results more intuitive.
[0008] 2. The present invention is used to separate irregular products after lithium battery crushing, providing more accurate guidance for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 This is a flow chart of a vertical air separation CFD-DEM coupling simulation method proposed by the present invention; Figure 2 A structural schematic diagram of a physical model of a vertical air separation CFD-DEM coupling simulation method proposed in the present invention; Figure 3 This is the overall framework of a vertical air separation CFD-DEM coupled simulation method system proposed in the present invention. DETAILED DESCRIPTION
[0010] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0011] These and other aspects of the embodiments of the present invention will be apparent with reference to the following description and accompanying drawings. In these descriptions and accompanying drawings, some specific implementations of the embodiments of the present invention are specifically disclosed to represent some ways of implementing the principles of the embodiments of the present invention, but it should be understood that the scope of the embodiments of the present invention is not limited thereto.
[0012] See also Figure 1 and Figure 2 The embodiment of the present invention provides a vertical air separation CFD-DEM coupling simulation method, the method comprising the following steps: Step 1, obtaining structural data of the vertical air separation device, using the structural data to construct a three-dimensional simulation model, and performing meshing processing on the three-dimensional simulation model to obtain a processed three-dimensional simulation model; In step 1, the structural data of the vertical air separation device is obtained, a three-dimensional simulation model is constructed using the structural data, and the three-dimensional simulation model is meshed to obtain a processed three-dimensional simulation model. The specific steps are as follows: Build a 3D simulation model based on structural data; Use meshing technology to partition and mesh the three-dimensional simulation model; Refine the mesh at the separation zone, air inlet and feed inlet in the model; Obtaining a processed three-dimensional simulation model; Step 2, obtaining processed data based on the processed three-dimensional simulation model, and constructing a momentum equation and a drag equation for non-spherical particles through the processed data; Based on the momentum equation and the drag equation for non-spherical particles, the gas-solid two-phase flow coupling equation is constructed by coupling. In step 2, the processed data is obtained based on the processed three-dimensional simulation model, and the momentum equation and the drag equation of the non-spherical particle are constructed by the processed data, wherein the expression of the momentum equation is: ; in, is the symbol of partial derivative, For time, is the porosity of the table, is the density of the gas, is the flow velocity of the gas, For pressure, is the acceleration due to gravity, is the average interaction force between fluid and particles per unit volume, is the Hamiltonian operator, is the stress tensor of the fluid phase; The drag equation for non-spherical particles is expressed as: ; in, is the drag force on the particle caused by the gas, is the drag coefficient, is the cross-sectional area of a spherical particle with the same volume as the actual particle, is the particle velocity, is the Reynolds number, is the particle diameter, is a natural constant, is the dynamic viscosity of the fluid, represents the correction factor; The expression of drag coefficient is: ; in, is the ratio of the surface area of spherical particles of equal volume to the actual surface area of particles, It is the ratio of the cross-sectional area of a spherical particle of equal volume to the projected area of the actual particle on a plane perpendicular to the flow direction. is a logarithmic function; Based on the momentum equation and the drag equation for non-spherical particles, the gas-solid two-phase flow coupling equation is constructed by coupling, and the relationship between the corresponding process is: ; in, is the stress tensor caused by particle viscosity.
[0013] Step 3: Use simulation software to simulate the gas-solid two-phase flow coupling equation and obtain visual results; The visualization results were verified using the experimental setup; In step 3, the gas-solid two-phase flow coupling equation is simulated using simulation software and the visualization results are obtained. The specific steps are as follows: The velocity inlet and pressure outlet are set as boundary conditions in the simulation process of the gas-solid two-phase flow coupling equation; Set the particle properties and initial velocity conditions according to the properties of the actual separation material; Based on the set particle properties and initial velocity conditions, the EDEM simulation software is used to simulate the gas-solid two-phase flow coupling equation and obtain the simulation results; And update the initial velocity conditions according to the simulation results; After completing the simulation, the simulation data is obtained; The simulation data is visualized to obtain visualization results.
[0014] See also Figure 3 The embodiment of the present invention further provides a vertical air separation CFD-DEM coupling simulation system, the system comprising: Model building modules for: Acquire structural data of the vertical air separation device, construct a three-dimensional simulation model using the structural data, perform meshing processing on the three-dimensional simulation model, and obtain a processed three-dimensional simulation model; Equation solving modules for: Obtain processed data based on the processed three-dimensional simulation model, and construct momentum equations and non-spherical particle drag equations through the processed data; Based on the momentum equation and the drag equation for non-spherical particles, the gas-solid two-phase flow coupling equation is constructed by coupling. Experimental verification module for: Use simulation software to simulate the gas-solid two-phase flow coupling equation and obtain visual results; The visualization results are verified using the experimental setup.
[0015] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.
[0016] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0017] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.
Claims
1. A vertical air separation CFD-DEM coupling simulation method, characterized in that: The method comprises the following steps: Step 1, obtaining structural data of the vertical air separation device, using the structural data to construct a three-dimensional simulation model, and performing meshing processing on the three-dimensional simulation model to obtain a processed three-dimensional simulation model; Step 2, obtaining processed data based on the processed three-dimensional simulation model, and constructing a momentum equation and a drag equation for non-spherical particles through the processed data; Based on the momentum equation and the drag equation for non-spherical particles, the gas-solid two-phase flow coupling equation is constructed by coupling. Step 3: Use simulation software to simulate the gas-solid two-phase flow coupling equation and obtain visual results; The visualization results are verified using the experimental setup.
2. A vertical air separation CFD-DEM coupling simulation method according to claim 1, characterized in that: In step 1, the structural data of the vertical air separation device is obtained, a three-dimensional simulation model is constructed using the structural data, and the three-dimensional simulation model is meshed to obtain a processed three-dimensional simulation model. The specific steps are as follows: Build a 3D simulation model based on structural data; Use meshing technology to partition and mesh the three-dimensional simulation model; Refine the mesh at the separation zone, air inlet and feed inlet in the model; The processed three-dimensional simulation model is obtained.
3. A vertical air separation CFD-DEM coupling simulation method according to claim 2, characterized in that: In step 2, processed data is obtained based on the processed three-dimensional simulation model, and the momentum equation and the non-spherical particle drag equation are constructed through the processed data, wherein the momentum equation is expressed as: ； in, is the symbol of partial derivative, For time, is the porosity of the table, is the density of the gas, is the flow velocity of the gas, For pressure, is the acceleration due to gravity, is the average interaction force between fluid and particles per unit volume, is the Hamiltonian operator, is the stress tensor of the fluid phase.
4. A vertical air separation CFD-DEM coupling simulation method according to claim 3, characterized in that: In step 2, processed data is obtained based on the processed three-dimensional simulation model, and the momentum equation and the non-spherical particle drag equation are constructed through the processed data, wherein the expression of the non-spherical particle drag equation is: ； in, is the drag force of the gas on the particle, is the drag coefficient, is the cross-sectional area of a spherical particle with the same volume as the actual particle, is the particle velocity, is the Reynolds number, is the particle diameter, is a natural constant, is the dynamic viscosity of the fluid, Represents the correction factor.
5. A vertical air separation CFD-DEM coupling simulation method according to claim 4, characterized in that: In the process of obtaining processed data based on the processed three-dimensional simulation model and constructing the momentum equation and the drag equation of non-spherical particles through the processed data, the expression of the drag coefficient is: ； in, is the ratio of the surface area of spherical particles of equal volume to the actual surface area of particles, It is the ratio of the cross-sectional area of a spherical particle of equal volume to the projected area of the actual particle on a plane perpendicular to the flow direction. is a logarithmic function.
6. A vertical air separation CFD-DEM coupling simulation method according to claim 5, characterized in that: In step 2, based on the momentum equation and the non-spherical particle drag equation, the gas-solid two-phase flow coupling equation is constructed by coupling, and the relationship between the corresponding process is: ； in, is the stress tensor due to particle viscosity.
7. A vertical air separation CFD-DEM coupling simulation method according to claim 6, characterized in that: In step 3, the gas-solid two-phase flow coupling equation is simulated using simulation software, and a visualization result is obtained. The specific steps are as follows: The velocity inlet and pressure outlet are set as boundary conditions in the simulation process of the gas-solid two-phase flow coupling equation; Set the particle properties and initial velocity conditions according to the properties of the actual separation material; Based on the set particle properties and initial velocity conditions, the EDEM simulation software is used to simulate the gas-solid two-phase flow coupling equation and obtain the simulation results; And update the initial velocity conditions according to the simulation results; After completing the simulation, the simulation data is obtained; The simulation data is visualized to obtain visualization results.
8. A vertical air separation CFD-DEM coupling simulation system, characterized in that: The system applies a vertical air separation CFD-DEM coupling simulation method as described in any one of claims 1 to 7 above, and the system comprises: Model building modules for: Acquire structural data of the vertical air separation device, construct a three-dimensional simulation model using the structural data, perform meshing processing on the three-dimensional simulation model, and obtain a processed three-dimensional simulation model; Equation solving modules for: Obtain processed data based on the processed three-dimensional simulation model, and construct momentum equations and non-spherical particle drag equations through the processed data; Based on the momentum equation and the drag equation for non-spherical particles, the gas-solid two-phase flow coupling equation is constructed by coupling. Experimental verification module for: Use simulation software to simulate the gas-solid two-phase flow coupling equation and obtain visual results; The visualization results are verified using the experimental setup.