Targeted performance-oriented anti-burst design method for cylindrical pressure-bearing equipment

Abstract

This invention relates to the field of energy transportation technology and discloses a method for designing explosion-resistant cylindrical pressure equipment with target performance. The method includes: S1: clarifying the design requirements of the pressure equipment and selecting one from sustainable service, controllable damage, and protection against penetration damage as its target explosion-resistant performance; S2: initially determining the structural dimensions of the pressure equipment; S3: establishing a numerical model of the dynamic response of the pressure equipment under explosion load and obtaining the response results through elastoplastic dynamic response analysis; S4: verifying the response results using corresponding judgment indicators based on the selected target explosion-resistant performance until the structural dimensions of the pressure equipment that meet the target explosion-resistant performance are obtained. This method establishes a three-level explosion-resistant performance target for different explosion-resistant performance requirements of pressure equipment under different service environments and risk levels, and provides corresponding design criteria and judgment indicators. It achieves quantifiable control over the elastoplastic response level and damage degree of the equipment, improving the design's relevance.

Description

Technical Field

[0001] This invention relates to the field of energy transportation technology, and in particular to a design method for anti-explosion of cylindrical pressure-bearing equipment oriented towards target performance. Background Technology

[0002] Pressure equipment is used for the storage and transportation of flammable and explosive media such as oil, natural gas, and hydrogen. During service, this equipment, in addition to bearing internal normal operating loads, may also be subjected to accidental external explosive loads. If it ruptures under an external explosive load, it can easily lead to leakage of the internal media. Therefore, it is necessary to conduct explosion-resistant design for pressure equipment to improve its safety protection capabilities. However, the target requirements for the explosion resistance performance of pressure equipment vary depending on the service scenario and risk level. For high-safety-requirement locations, the response of pressure equipment after being subjected to an explosive load is usually limited to the elastic stage to ensure equipment integrity and sustainable service. For pressure equipment with general safety requirements, plastic deformation is usually allowed, and ensuring that it does not rupture under a single explosive load is sufficient to meet the explosion resistance performance requirements.

[0003] Currently, in the field of explosion-proof design for pressure equipment, existing methods mainly focus on resisting implosion loads, while some methods also exist for resisting external explosion loads. These methods provide different design and safety verification criteria for pressure equipment under two service scenarios: continuous service and non-fracture under a single explosion load. However, these methods cannot achieve quantitative control over the equipment's elasto-plastic response level and damage degree, and still cannot meet the different explosion-proof performance design requirements for pressure equipment under different service scenarios and risk levels. Summary of the Invention

[0004] To address the technical problem that existing explosion-resistant design methods cannot meet the differentiated explosion-resistant performance design requirements of pressure equipment, this invention provides an explosion-resistant design method for cylindrical pressure equipment oriented towards target performance. This method establishes three levels of explosion-resistant performance targets—sustainable service, controllable damage, and prevention of penetration damage—to address the different explosion-resistant performance requirements of pressure equipment under different service environments and risk levels. It also provides corresponding design criteria and judgment indicators for different explosion-resistant performance targets, enabling quantifiable control over the equipment's elastoplastic response level and damage degree, improving the design's relevance, and meeting the explosion-resistant design requirements of pressure equipment under different service scenarios and risk levels.

[0005] This invention provides a method for designing explosion-resistant cylindrical pressure-bearing equipment with target performance, comprising:

[0006] S1: Define the design requirements for pressure equipment and select one of the following as its target explosion resistance performance: sustainable service (P1), controllable damage (P2), and protection against penetration damage (P3);

[0007] S2: Initially determine the structural dimensions of the pressure-bearing equipment; and perform a static strength check on the initially determined pressure-bearing equipment: if it fails, redesign the structural dimensions; if it passes, proceed to step S3;

[0008] S3: Establish a numerical model of the dynamic response of the pressure-bearing equipment under external explosion load, and perform elastoplastic dynamic response analysis through the numerical model of the dynamic response to obtain the response results of the pressure-bearing equipment;

[0009] S4: Based on the selected target explosion-proof performance, the response results are verified using corresponding judgment indicators until the structural dimensions of the pressure equipment that meet the target explosion-proof performance are obtained; wherein...

[0010] The criteria for determining sustainable service (P1) are:

[0011] ;and ;

[0012] in, The maximum equivalent plastic strain of the pressure-bearing equipment after the external explosion load is applied; The average thin film equivalent plastic strain of the pressure-bearing equipment wall thickness after external explosion load is applied;

[0013] The criteria for determining controllable damage (P2) are:

[0014] ;or ;

[0015] in, The device ductility ratio is expressed as follows: , The maximum deflection of the pressure vessel cylinder after the external explosion load is applied. The deflection of the cylinder section in the thickness direction of the pressure-bearing equipment when it fully yields after the external explosion load is applied. The deflection angle of the cylinder section is defined as the angle formed by the axial tangent direction at the connection point between the end cap and the cylinder before deformation of the pressure equipment, and the line connecting the connection point and the point of maximum deflection of the cylinder after deformation.

[0016] The criteria for determining protection against penetration damage (P3) are:

[0017] ;

[0018] in, The structural penetration factor is... Pressure-bearing equipment after external explosion load is applied within the area Maximum depth along the wall thickness direction The thickness of the cylinder wall; , For the equivalent plastic strain of the pressure-bearing equipment after external explosion load, This represents the fracture strain.

[0019] In some embodiments, the controllable damage (P2) includes first-order damage (P... 21 ) and secondary injury (P 22 );

[0020] The first-degree injury (P) 21 The criteria for determining () are:

[0021] ;or ;

[0022] The secondary injury (P) 22 The criteria for determining () are:

[0023] ;or ;

[0024] In some embodiments, in step S3, the external explosion load applied to the numerical model of the dynamic response has an explosion shock wave impulse determined by multiplying the designed explosion shock wave impulse by a load amplification factor.

[0025] In some embodiments, in step S1, the design requirements include at least one of the following: explosion load type, design explosion load impulse magnitude, design pressure, working pressure, design temperature range, working temperature range, medium composition, medium characteristics, equipment category, design service life, equipment material, and geometric volume.

[0026] In some embodiments, the structural dimensions include the inner diameter, length, and wall thickness of the pressure vessel.

[0027] In some embodiments, when the target blast resistance performance is sustainable service (P1), the explosion load in the dynamic response numerical model established in step S3 is applied by applying a time-dependent corresponding pressure load to the outer wall of the pressure equipment, or by constructing a fluid-structure interaction numerical analysis model of the dynamic response of the pressure equipment under the explosion flow field to apply the explosion load.

[0028] In some embodiments, when the target blast resistance is controllable damage (P2) or penetration-resistant damage (P3), the explosion load in the dynamic response numerical model established in step S3 is applied by constructing a fluid-structure interaction numerical analysis model of the dynamic response of the pressure-bearing equipment under the explosion flow field.

[0029] In some embodiments, the mechanical properties of the pressure-bearing equipment material in the dynamic response analysis model are described by a stress-strain constitutive relation related to strain rate; the material failure behavior is characterized by a dynamic failure criterion related to strain rate and stress triaxiality.

[0030] Compared with the prior art, the advantages and positive effects of the present invention are:

[0031] The aforementioned design method for explosion-proof cylindrical pressure equipment, which focuses on target performance, establishes a three-level target explosion-proof performance system for sustainable service, controllable damage, and prevention of penetration damage, in response to the differentiated explosion-proof performance requirements under different service environments and risk levels. This system enables design based on the actual explosion-proof performance requirements of the pressure equipment, thereby improving the design's relevance.

[0032] Furthermore, this method proposes corresponding design criteria and judgment indicators for different target explosion resistance performances, realizing quantitative control of the degree of plastic deformation and damage of pressure equipment. It can meet the explosion resistance performance design requirements of equipment with the minimum cost or minimum weight, solve the problem of wall thickness design redundancy in existing design methods, and improve the economic efficiency of design. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a flowchart of the explosion-resistant design method for cylindrical pressure-bearing equipment based on target performance, as described in this invention.

[0035] Figure 2 The deflection angle of the cylinder section in the target performance-oriented cylindrical pressure-bearing equipment anti-explosion design method of this invention. A schematic diagram;

[0036] Figure 3 This is a stress distribution cloud map of the gas cylinder stress analysis model in the target performance-oriented cylindrical pressure-bearing equipment anti-explosion design method of the present invention;

[0037] Figure 4 This is a gas cylinder model diagram in the fluid-structure interaction numerical analysis model of the fluid-structure interaction design method for the anti-explosion design of cylindrical pressure-bearing equipment oriented towards target performance in this invention;

[0038] Figure 5 This is a simulation diagram of a gas cylinder under explosion load in the target performance-oriented cylindrical pressure-bearing equipment anti-explosion design method of the present invention; Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Reference Figures 1-5 This is an embodiment of the explosion-resistant design method for cylindrical pressure-bearing equipment based on target performance, as described in this invention. Figure 2 As shown, the pressure vessel includes a cylinder 1 and end caps 2 connected to both ends of the cylinder.

[0041] like Figure 1 As shown, the method for designing explosion-resistant cylindrical pressure-bearing equipment with target performance includes the following steps:

[0042] S1: Define the design requirements for pressure equipment and select one of the following as its target explosion resistance performance: sustainable service (P1), controllable damage (P2), and protection against penetration damage (P3).

[0043] S2: Initially determine the structural dimensions of the pressure-bearing equipment; and perform a static strength check on the initially determined pressure-bearing equipment: if it fails, redesign the structural dimensions; if it passes, proceed to step S3;

[0044] S3: Establish a numerical model of the dynamic response of the pressure-bearing equipment under external explosion load, and conduct elastoplastic dynamic response analysis through the numerical model of dynamic response to obtain the response results of the pressure-bearing equipment.

[0045] S4: Based on the selected target explosion resistance performance, the response results are verified using the corresponding judgment index until the structural dimensions of the pressure equipment that meet the target explosion resistance performance are obtained.

[0046] The criteria for determining sustainable service (P1) are as follows:

[0047] ;and ;

[0048] in, The maximum equivalent plastic strain of the pressure-bearing equipment after the external explosion load is applied; The average thin film equivalent plastic strain of the pressure-bearing equipment wall thickness after external explosion load is applied;

[0049] The criteria for determining controllable damage (P2) are:

[0050] ;or ;

[0051] in, The device ductility ratio is expressed as follows: , The maximum deflection of the pressure vessel cylinder after the external explosion load is applied. The deflection of the cylinder section in the thickness direction of the pressure-bearing equipment when it fully yields after the external explosion load is applied. The deflection angle of the cylinder section is defined as the angle formed by the axial tangent direction at the connection point between the end cap and the cylinder before deformation of the pressure equipment, and the line connecting the connection point and the point of maximum deflection of the cylinder after deformation.

[0052] The criteria for determining protection against penetration damage (P3) are:

[0053] ;

[0054] in, The structural penetration factor is... Pressure-bearing equipment after external explosion load is applied within the area Maximum depth along the wall thickness direction The thickness of the cylinder wall; , For the equivalent plastic strain of the pressure-bearing equipment after external explosion load, This represents the fracture strain.

[0055] The present invention provides a target-performance-oriented design method for the explosion-proof design of cylindrical pressure equipment. It establishes a three-level target explosion-proof performance system for sustainable service, controllable damage, and prevention of penetration damage, in response to the differentiated explosion-proof performance requirements under different service environments and risk levels. This system can be designed according to the actual explosion-proof performance requirements of the pressure equipment, thereby improving the design's relevance.

[0056] Furthermore, this method proposes corresponding design criteria and judgment indicators for different target explosion resistance performances, realizing quantitative control of the degree of plastic deformation and damage of pressure equipment. It can meet the explosion resistance performance design requirements of equipment with the minimum cost or minimum weight, solve the problem of wall thickness design redundancy in existing design methods, and improve the economic efficiency of design.

[0057] To further clarify the technical solution of the present invention, the various steps of the present invention will be described in more detail below.

[0058] S1: Define the design requirements and target explosion-proof performance of pressure equipment.

[0059] In step S1, the design requirements for the pressure-bearing equipment specifically include the type of explosive load that the pressure-bearing equipment will withstand and the magnitude of the designed explosive load impulse; the main technical parameters of the equipment, including the design pressure and working pressure, the design temperature range and working temperature range, the composition and characteristics of the medium; as well as the equipment category, design service life, equipment materials, geometric volume, etc.

[0060] The target blast resistance performance includes three levels: sustainable service (P1), controllable damage (P2), and protection against penetration damage (P3), which are defined as follows:

[0061] Sustainable Service (P1): After being subjected to explosive loads, the equipment remains largely elastic, with only minor plastic deformation occurring in confined areas. This has no impact on service continuity, and the equipment can continue to operate normally.

[0062] Controllable damage (P2): After the equipment is subjected to explosive load, local plastic deformation and a certain degree of damage are allowed, but the overall structure does not fail and can be restored to use after repair.

[0063] Protection against penetration damage (P3): After being subjected to explosive loads, the equipment is allowed to undergo significant plastic deformation or even partial loss of function. The equipment can no longer continue to serve, but the structural integrity is guaranteed, and there will be no penetration damage, explosive leakage, or overall structural failure.

[0064] S2: Preliminary determination of the structural dimensions of the pressure equipment

[0065] In step S2, based on the design requirements, service environment, and working conditions of the pressure equipment, and in accordance with relevant applicable design specifications and standards, the type, geometry, and materials of the pressure equipment are determined, and the preliminary structural dimensions are designed. These structural dimensions include parameters such as the inner diameter, length, and wall thickness of the pressure equipment.

[0066] Furthermore, after step S2, step S21 is also included: performing a static strength check on the preliminarily determined structural dimensions of the pressure-bearing equipment.

[0067] Specifically, for pressure vessels with a design pressure not exceeding 35MPa, the equipment dimensions, wall thickness, and other parameters are determined using conventional design methods in accordance with the national standard GB / T 150-Pressure Vessels.

[0068] For pressure vessels with a design pressure greater than or equal to 35 MPa and less than 100 MPa, static strength design is performed using analytical methods according to the national standard GB / T4732-Pressure Vessel Analysis and Design, and stress classification and linearization checks are performed on areas with high stress. If the static strength check does not meet the requirements of the standard, the structural dimensions or material parameters are adjusted and the design and check are repeated; if the requirements are met, proceed to the next step.

[0069] S3: Establish a numerical model of the dynamic response and perform elastoplastic dynamic response analysis.

[0070] Before step S3, i.e., before performing the elastoplastic dynamic response analysis, to avoid the occurrence of plastic instability in the pressure equipment, it is necessary to determine the corresponding load amplification factor according to the design requirements. The impulse of the explosion shock wave during the dynamic response analysis of the pressure equipment under external explosion load = design explosion shock wave impulse × load amplification factor. The value of this load amplification factor can be taken as 1.75, referring to the ASME standard for explosion-proof design of pressure equipment.

[0071] In step S3, after establishing the dynamic response numerical model, it is necessary to select an appropriate explosion load application method according to different target explosion resistance performance.

[0072] Specifically, for pressure equipment with explosion resistance performance aimed at sustainable service (P1), since its overall structural response is basically elastic, structural deformation is small, and plastic energy dissipation effect can be ignored, there are two ways to apply the explosion load in its dynamic response model:

[0073] Method 1: Applying explosive loads by applying time-dependent pressure loads to the outer wall of the pressure equipment.

[0074] Method 2: Alternatively, the loading of explosive loads can be achieved by combining the immersion boundary method, arbitrary Lagrange-Euler algorithms, and other algorithms to construct a fluid-structure interaction numerical analysis model of the pressure-bearing equipment under the explosive flow field.

[0075] For pressure equipment with explosion resistance performance targeting controlled damage (P2) or penetration damage (P3), its structural response involves the elastoplastic stage, with significant structural deformation. The resulting plastic energy dissipation effect will cause the actual load impulse borne by the structure to be lower than the original applied load impulse. Therefore, the application of explosion load can be achieved by constructing a fluid-structure interaction numerical analysis model of the pressure equipment under the explosion flow field, so as to accurately apply the explosion load and characterize the structural dynamic response.

[0076] In the fluid-structure interaction numerical analysis model, the mechanical properties of the pressure-bearing equipment material are described using a stress-strain constitutive relation related to strain rate, and the material failure behavior should also be characterized using a dynamic failure criterion related to strain rate, i.e.:

[0077] ;

[0078] ;

[0079] in, For stress; For fracture strain; In response to the situation; For strain rate; The stress is triaxial. Furthermore, the material mechanical property parameters in the above constitutive relation were obtained at the corresponding temperature of the pressure-bearing equipment before the explosive load was applied. The stress-strain mechanical property parameters and failure parameters related to the material strain rate can be obtained by conducting Hopkinson bar dynamic loading tests on material specimens or by consulting relevant literature.

[0080] S4: Verification of the explosion resistance performance of pressure equipment under explosive load

[0081] In step S4, the response result is verified using corresponding judgment indicators based on the selected target blast resistance performance. The judgment indicators are defined as follows:

[0082] The specific criteria for determining sustainable service (P1) are as follows:

[0083] ;and ;

[0084] in, The maximum equivalent plastic strain of the pressure-bearing equipment after the external explosion load is applied; The average thin film equivalent plastic strain of the pressure-bearing equipment wall thickness after external explosion load is applied.

[0085] Controllable damage (P2) can be further subdivided based on the degree of damage to pressure equipment after being subjected to explosive loads:

[0086] Grade I injury (P) 21 The definition of "minor damage" is as follows: The equipment suffers relatively minor damage, primarily manifested as slight deformation of the overall structure or limited plastic deformation of local structures, while maintaining structural integrity and allowing for continued service after repair. Specific criteria for assessment are as follows:

[0087] ;or ;

[0088] Secondary injury (P) 22 Level 1 damage is defined as follows: The equipment is severely damaged, primarily manifested as significant overall deformation, loss of localized function, a marked decrease in load-bearing capacity, and compromised structural integrity. Compared to Level 1 damage, its repair and reuse value is relatively low. Specific criteria for assessment are as follows:

[0089] ;or ;

[0090] in, The device ductility ratio is expressed as follows: ,in The maximum deflection of the pressure vessel cylinder after the external explosion load is applied. This refers to the deflection of the cylinder section in the thickness direction when the pressure-bearing equipment fully yields after the external explosion load is applied. The deflection angle of the cylinder section is physically defined as: the angle formed by the axial tangent direction at the connection point (point a) between the end cap 2 and the cylinder 1 before the pressure vessel deforms due to the explosion, and the line connecting this connection point and the point of maximum deflection of the cylinder after deformation (point b). See [reference needed]. Figure 2 .

[0091] The specific criteria for determining protection against penetrating damage (P3) are as follows:

[0092] ;

[0093] in, The structural penetration factor is... Pressure-bearing equipment after external explosion load is applied within the area Maximum depth along the wall thickness direction The thickness of the cylinder wall; , For the equivalent plastic strain of the pressure-bearing equipment after external explosion load, Fracture strain.

[0094] If the response of the pressure-bearing equipment is confirmed to meet the selected target explosion-proof performance (i.e., P1, P2, or P3) after comparison with the judgment criteria, then the structural dimension design of the current pressure-bearing equipment is considered successful, and its explosion-proof performance has reached the preset target. At this point, the entire explosion-proof design process is complete.

[0095] Conversely, if the verification results do not meet the selected target explosion resistance performance, it indicates that the current structural dimensions cannot meet the explosion resistance requirements. In this case, the equipment design needs to be improved, and the modeling, analysis, and verification cycle of steps S2 to S4 needs to be repeated until the structural dimensions that meet the requirements are obtained.

[0096] The technical solution of the present invention will be described in detail below through specific and exemplary embodiments.

[0097] According to the explosion-proof design method for pressure equipment proposed in this invention, a pressure equipment with explosion-proof performance capable of withstanding controllable damage and considering subsequent repair is designed. The pressure equipment type is a single-layer hydrogen storage cylinder with a volume of 1000L and a design pressure of 50MPa, requiring it to withstand explosions of not less than 10... 4 The impulse of the explosion shock wave.

[0098] 1. Clearly define the design requirements and target explosion-proof performance of pressure equipment.

[0099] Based on the working environment, the main technical parameters are shown in Table 1.

[0100] Table 1 Main Technical Parameters

[0101] 2. Preliminary design of structural dimensions and static strength verification of pressure equipment

[0102] Based on the proposed design of a single-layer hydrogen storage cylinder with a geometric volume of 1000L, the cylinder length L is 2850mm, the end cap is a hemispherical shape with a radius R of 325mm, and the total cylinder length is 3500mm. The cylinder's inner diameter is 650mm, and the design pressure is 50MPa. An analytical design method is required for the preliminary design and verification of the cylinder. The cylinder wall thickness is calculated using the formula in GB / T 4732 - Analysis and Design of Pressure Vessels.

[0103] ;

[0104] in, To calculate the thickness; The design pressure is set at 50 MPa. The inner diameter of the cylinder; For the allowable stress of the material, take 398 MPa, 0.4 > .

[0105] The calculated thickness of the gas cylinder, based on the above formula, is 43.6 mm. Design thickness = calculated thickness + corrosion allowance. The nominal thickness is the design thickness plus the negative deviation of the material thickness, rounded up to the material's standard specification thickness. Considering the extremely low corrosiveness of the medium, the corrosion allowance is taken as 0, and rounded up according to relevant national standards, resulting in a final nominal thickness of 45 mm for the gas cylinder.

[0106] A stress analysis model of a single-layer hydrogen storage cylinder under the design pressure was constructed using finite element analysis software, and the stress distribution cloud map of the designed hydrogen storage cylinder was obtained. (See attached image.) Figure 3 Based on the calculation results, five stress classification lines were selected at the middle of the hydrogen storage container, the middle of the end cap, and the inlet / outlet gas pipe seats for stress linearization verification. The overall film stress (P) was then calculated once. m ) and primary stress with secondary stress (P) L +P b +Q), the verification result is as follows Figure 5 As shown in Table 2, the stress at all stress classification lines is below the allowable stress intensity limit. Therefore, the designed single-layer hydrogen storage cylinder passes the verification.

[0107] Table 2 Stress classification and linearization verification results

[0108] 3. Elastic-plastic dynamic response analysis of pressure-bearing equipment under explosive load

[0109] To prevent plastic instability in pressure-bearing equipment, the load amplification factor is 1.75. The impulse of the explosion shock wave experienced by the pressure-bearing equipment under external explosion load in the dynamic response analysis is 10. 4 ×1.75=1.75×10 4 .

[0110] A fluid-structure interaction numerical analysis model of the dynamic response of a pressure vessel under an explosive flow field was constructed using LS-DYNA software and algorithms such as the immersion boundary method and arbitrary Lagrange-Euler methods. This model implemented the application of external explosive loads, while the internal pressure of the gas cylinder was achieved by setting pressure boundary conditions on the inner wall. The gas cylinder model is shown below. Figure 4 As shown, the key locations of the gas cylinder are subjected to mesh refinement, and fixed boundary conditions are applied to the left and right end caps of the gas cylinder.

[0111] The dynamic response behavior of the material in the model is described using the Johnson-Cook dynamic constitutive model and failure criteria, namely:

[0112] ;

[0113] ;

[0114] In the formula, , , , These represent the material's equivalent stress, equivalent plastic strain, plastic strain rate, and reference strain rate, respectively, where A, B, n, and C are material constants. For fracture strain, The stress triaxiality is represented by D1-D4, which are material failure parameters.

[0115] Relevant literature was consulted to obtain the material parameters of 4130X steel, as shown in Table 3. Where ρ is the material's mass density, E is Young's modulus, and υ is Poisson's ratio.

[0116] Table 3 Parameters of 4130X Steel

[0117] 4. Verification of the explosion resistance performance of pressure equipment under explosive load

[0118] By analyzing the target performance quantitative indicators, including plastic strain, structural displacement, and structural penetration coefficient of the pressure-bearing equipment obtained from the simulation, the response results are verified to ensure that they meet the explosion-proof design performance indicators.

[0119] According to regulations, the target's blast resistance performance is Level 1 damage (P... 21 Pressure equipment should meet the following requirements:

[0120] ;or ;

[0121] The simulated maximum structural deflection is located in the central region of the equipment's blast-facing surface, such as... Figure 5 As shown.

[0122] Maximum deflection of the pressure vessel cylinder after external explosion load is applied Deflection of the cylinder wall section under full yield in the thickness direction . Meanwhile, based on the simulation results, we can obtain... .

[0123] Therefore, the gas cylinder was assessed to meet the design requirements and satisfy the explosion-proof performance target.

[0124] 5. Complete the explosion-proof design of pressure equipment.

[0125] The single-layer hydrogen storage cylinder passed the static strength check and the safety status check of the pressure-bearing equipment under explosion load. Therefore, the explosion resistance of the single-layer hydrogen storage cylinder is considered to meet the design requirements, and the design is completed. The main parameters of the designed single-layer hydrogen storage cylinder are shown in Table 4.

[0126] Table 4 Main Design Parameters

[0127] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A method for designing explosion-resistant cylindrical pressure-bearing equipment with target performance, characterized in that, include: S1: Define the design requirements for pressure equipment and select one of the following as its target explosion resistance performance: sustainable service (P1), controllable damage (P2), and protection against penetration damage (P3); S2: Initially determine the structural dimensions of the pressure-bearing equipment, and perform a static strength check on the initially determined pressure-bearing equipment: if it fails, redesign the structural dimensions; if it passes, proceed to step S3. S3: Establish a numerical model of the dynamic response of the pressure-bearing equipment under external explosion load, and perform elastoplastic dynamic response analysis through the numerical model of the dynamic response to obtain the response results of the pressure-bearing equipment; S4: Based on the selected target explosion-proof performance, the response results are verified using corresponding judgment indicators until the structural dimensions of the pressure equipment that meet the target explosion-proof performance are obtained; wherein... The criteria for determining sustainable service (P1) are: ;and ; in, The maximum equivalent plastic strain of the pressure-bearing equipment after the external explosion load is applied; The average thin film equivalent plastic strain of the pressure-bearing equipment wall thickness after external explosion load is applied; The criteria for determining controllable damage (P2) are: ;or ; in, The device ductility ratio is expressed as follows: , The maximum deflection of the pressure vessel cylinder after the external explosion load is applied. The deflection of the cylinder section in the thickness direction of the pressure-bearing equipment when it fully yields after the external explosion load is applied. The deflection angle of the cylinder section is defined as the angle formed by the axial tangent direction at the connection point between the end cap and the cylinder before deformation of the pressure equipment, and the line connecting the connection point and the point of maximum deflection of the cylinder after deformation. The criteria for determining protection against penetration damage (P3) are: ； in, The structural penetration factor is... Pressure-bearing equipment after external explosion load is applied within the area Maximum depth along the wall thickness direction The thickness of the cylinder wall; , For the equivalent plastic strain of the pressure-bearing equipment after external explosion load, This represents the fracture strain.

2. The method for designing explosion-resistant cylindrical pressure-bearing equipment based on target performance as described in claim 1, characterized in that, The controllable damage (P2) includes a primary damage (P 21 ) and a secondary damage (P 22 ). The determination index of the primary damage (P 21 ) is: ;or ; The secondary injury (P 22 ) determination index is: ;or .

3. The method for designing explosion-resistant cylindrical pressure-bearing equipment based on target performance as described in claim 1, characterized in that, In step S3, the external explosion load applied to the numerical model of the dynamic response has an explosion shock wave impulse determined by multiplying the designed explosion shock wave impulse by a load amplification factor.

4. The method for designing explosion-resistant cylindrical pressure-bearing equipment based on target performance according to claim 1, characterized in that, In step S1, the design requirements include at least one of the following: explosion load type, design explosion load impulse magnitude, design pressure, working pressure, design temperature range, working temperature range, medium composition, medium characteristics, equipment category, design service life, equipment material, and geometric volume.

5. The method for designing explosion-resistant cylindrical pressure-bearing equipment based on target performance according to claim 1, characterized in that, The structural dimensions include the inner diameter, length, and wall thickness of the pressure equipment.

6. The method for designing explosion-resistant cylindrical pressure-bearing equipment based on target performance according to claim 1, characterized in that, When the target blast resistance performance is sustainable service (P1), the explosion load in the dynamic response numerical model established in step S3 is applied by applying a time-dependent corresponding pressure load to the outer wall of the pressure equipment, or by constructing a fluid-structure interaction numerical analysis model of the dynamic response of the pressure equipment under the explosion flow field.

7. The method for designing explosion-resistant cylindrical pressure-bearing equipment based on target performance according to claim 1, characterized in that, When the target's blast resistance is controllable damage (P2) or penetration-resistant damage (P3), the explosion load in the dynamic response numerical model established in step S3 is applied, which is achieved by constructing a fluid-structure interaction numerical analysis model of the dynamic response of the pressure-bearing equipment under the explosion flow field.

8. The method for designing explosion-resistant cylindrical pressure-bearing equipment based on target performance according to claim 1, characterized in that, In the dynamic response analysis model, the mechanical properties of the pressure equipment material are described by the stress-strain constitutive relationship related to strain rate; the material failure behavior is characterized by the dynamic failure criterion related to strain rate and stress triaxiality.

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