Finite element optimization design method based on plastic inner container for gas storage

Abstract

The invention discloses a finite element optimization design method based on a plastic inner container for gas storage, and belongs to the technical field of high-pressure hydrogen storage cylinders. According to ANSYSWorkbench finite element calculation, high-pressure hydrogen storage cylinders with different seal head structures can be quickly calculated, so that the most suitable seal head structure is calculated, and an optimal seal head gas cylinder model under the actual working condition can be simulated by using a finite element analysis method, so that the consumption of a large amount of manpower and financial resources is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure hydrogen storage cylinders, and specifically relates to a finite element optimization design method based on a plastic liner for gas storage. Background Art

[0002] Gas cylinders are a type of equipment used to store gas. They are often used to store and transport gas and are widely used in various fields. At present, in order to meet the requirements of larger gas storage capacity, better sealing and higher safety, it is necessary to continuously optimize the structure of gas cylinders, thereby increasing their gas storage capacity, enhancing sealing and improving the safety of gas cylinders during filling, discharging and use.

[0003] During the research and development of gas cylinders, due to the diversity of their head structures, it is necessary to continuously open molds and then use the blow molding process to produce gas cylinders; after the gas cylinders are manufactured, a series of experiments are required to verify whether their various performances meet the standards. The research and development process consumes a lot of human and financial resources. Summary of the invention

[0004] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a finite element optimization design method based on a plastic liner for gas storage.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions: a finite element optimization design method based on a plastic liner for gas storage,

[0006] Step 1: Taking high-pressure hydrogen storage cylinders as the research object, according to the structure of high-pressure hydrogen storage cylinders, SolidWorks software is used to divide the heads of high-pressure hydrogen storage cylinders into hemispherical heads (HHA), elliptical heads (EHA), butterfly heads (THA) and spherical heads (SDH), and the models of gas cylinders with different heads are modeled;

[0007] Step 2: Process the obtained geometric model and optimize the threaded holes on the surface of the high-pressure hydrogen storage cylinder;

[0008] Step 3: The optimized model is saved in a common format and imported into ANSYS Workbench software, and material properties are added, and a gas pressure of 0.5 MPa is applied to the inner wall of the gas cylinder;

[0009] Step 4: Use ANSYS Workbench software to perform finite element calculations on high-pressure hydrogen storage cylinders with different head structures under pressure, obtain stress cloud maps and deformation cloud maps of the finite element calculation simulation results under pressure conditions, and compare the finite element calculation results of high-pressure hydrogen storage cylinders with different head structures.

[0010] Preferably, the high-pressure hydrogen storage cylinder comprises a tank body and sealing heads on front and rear sides.

[0011] Preferably, the high-pressure hydrogen storage cylinder is formed as a whole in one step by blow molding.

[0012] Preferably, the finite element calculation of the high-pressure hydrogen storage cylinder in step 3 includes the following settings:

[0013] Material setting: The material of high-pressure hydrogen storage cylinder is one of HDPE and PA6;

[0014] Meshing: The high-pressure hydrogen storage cylinder contains many curved surfaces, so they are all divided using tetrahedral meshes with a mesh size of 0.01m. Fixed constraints are applied to obtain the overall meshing model of the high-pressure hydrogen storage cylinder.

[0015] As a preferred embodiment, the maximum stress and maximum deformation of the hemispherical head gas cylinder model are the smallest among the four gas cylinder models, and the hemispherical head model is determined to be the optimal head gas cylinder model.

[0016] The present invention has the beneficial effects as follows: according to the ANSYS Workbench finite element calculation, high-pressure hydrogen storage cylinders with different head structures can be quickly calculated, so as to calculate the most suitable head structure, and the finite element analysis method can be used to simulate the optimal head storage cylinder model under actual working conditions, thereby reducing the consumption of a large amount of human and financial resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a finite element analysis chart of the gas cylinder model with different heads of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the high-pressure hydrogen storage cylinder of the present invention.

[0019] In the figure: 1. Tank body; 2. End cover. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0021] Embodiment: A finite element optimization design method for a plastic liner for gas storage, such as Figure 1-Figure 2 As shown,

[0022] Step 1: Taking high-pressure hydrogen storage cylinders as the research object, according to the structure of high-pressure hydrogen storage cylinders, SolidWorks software is used to divide the heads of high-pressure hydrogen storage cylinders into hemispherical heads (HHA), elliptical heads (EHA), butterfly heads (THA) and spherical heads (SDH), and the models of gas cylinders with different heads are modeled;

[0023] Step 2: Process the obtained geometric model and optimize the threaded holes on the surface of the high-pressure hydrogen storage cylinder;

[0024] Step 3: The optimized model is saved in a common format and imported into ANSYS Workbench software, and material properties are added, and a gas pressure of 0.5 MPa is applied to the inner wall of the gas cylinder;

[0025] Step 4: Use ANSYS Workbench software to perform finite element calculations on high-pressure hydrogen storage cylinders with different head structures under pressure, obtain stress cloud maps and deformation cloud maps of finite element calculation simulation results under pressure conditions, and compare finite element calculation results of high-pressure hydrogen storage cylinders with different head structures;

[0026] The high-pressure hydrogen storage cylinder comprises a tank body and sealing heads at the front and rear sides.

[0027] The high-pressure hydrogen storage cylinder is integrally formed in one step by blow molding.

[0028] The finite element calculation of the high-pressure hydrogen storage cylinder in step 3 includes the following settings:

[0029] Material setting: The material of high-pressure hydrogen storage cylinder is one of HDPE and PA6;

[0030] Meshing: The high-pressure hydrogen storage cylinder contains many curved surfaces, so they are all divided using tetrahedral meshes with a mesh size of 0.01m. Fixed constraints are applied to obtain the overall meshing model of the high-pressure hydrogen storage cylinder.

[0031] The maximum stress and maximum deformation of the hemispherical head gas cylinder model are the smallest among the four gas cylinder models, and the hemispherical head model is determined to be the optimal head gas cylinder model.

[0032] The obtained stress cloud map and deformation cloud map determine the gas storage cylinder with the optimal head. Figure 1 Figure 2 is the finite element analysis results of gas cylinder models with different heads. It can be seen from the finite element analysis results that the maximum stress and maximum deformation of the hemispherical head gas cylinder model are the smallest among the four gas cylinder models, and the hemispherical head model is determined to be the optimal head gas cylinder model.

[0033] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A finite element optimization design method for a plastic liner for gas storage, characterized in that: These include: Step 1: Taking high-pressure hydrogen storage cylinders as the research object, according to the structure of high-pressure hydrogen storage cylinders, SolidWorks software is used to divide the heads of high-pressure hydrogen storage cylinders into hemispherical heads (HHA), elliptical heads (EHA), butterfly heads (THA) and spherical heads (SDH), and the models of gas cylinders with different heads are modeled; Step 2: Process the obtained geometric model and optimize the threaded holes on the surface of the high-pressure hydrogen storage cylinder; Step 3: The optimized model is saved in a common format and imported into ANSYS Workbench software, and material properties are added, and a gas pressure of 0.5 MPa is applied to the inner wall of the gas cylinder; Step 4: Use ANSYS Workbench software to perform finite element calculations on high-pressure hydrogen storage cylinders with different head structures under pressure, obtain stress cloud maps and deformation cloud maps of the finite element calculation simulation results under pressure conditions, and compare the finite element calculation results of high-pressure hydrogen storage cylinders with different head structures.

2. The finite element optimization design method for a plastic liner for gas storage according to claim 1 is characterized in that: The high-pressure hydrogen storage cylinder comprises a tank body and sealing heads at the front and rear sides.

3. The finite element optimization design method for a plastic liner for gas storage according to claim 1 is characterized in that: The high-pressure hydrogen storage cylinder is integrally formed in one step by blow molding.

4. The finite element optimization design method for a plastic liner for gas storage according to claim 2 is characterized in that: The finite element calculation of the high-pressure hydrogen storage cylinder in step 3 includes the following settings: Material setting: The material of high-pressure hydrogen storage cylinder is one of HDPE and PA6; Meshing: The high-pressure hydrogen storage cylinder contains many curved surfaces, so they are all divided using tetrahedral meshes with a mesh size of 0.01m. Fixed constraints are applied to obtain the overall meshing model of the high-pressure hydrogen storage cylinder.

5. The finite element optimization design method for a plastic liner for gas storage according to claim 1 is characterized in that: The maximum stress and maximum deformation of the hemispherical head gas cylinder model are the smallest among the four gas cylinder models, and the hemispherical head model is determined to be the optimal head gas cylinder model.

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