Method for evaluating the suitability of non-metallic seals for hydrogen pipelines

Abstract

The application provides a hydrogen transmission pipeline non-metallic sealing piece applicability evaluation method, considers hydrogen-doped physicochemical properties of the non-metallic sealing piece, combines actual operation conditions and surrounding external environment of the hydrogen transmission pipeline, comprehensively analyzes the hydrogen-doped physicochemical properties, operation parameters and management level of the non-metallic sealing piece, first constructs a hydrogen transmission pipeline non-metallic sealing piece applicability evaluation index system and specific index scoring criteria, provides an evaluation means for the applicability evaluation of the hydrogen transmission pipeline non-metallic sealing piece, and provides strong support for selection of the hydrogen transmission pipeline non-metallic sealing piece in a construction period and applicability evaluation of the non-metallic sealing piece in an operation period.

Description

Technical Field

[0001] This invention belongs to the field of safety risk assessment technology and relates to a method for evaluating the suitability of non-metallic sealing components for hydrogen pipelines. Background Technology

[0002] Hydrogen energy boasts advantages such as being pollution-free, sustainable, zero-emission, and highly efficient, gradually becoming one of the important directions for new energy development. In the future, hydrogen energy will account for at least 15% of the final energy system, complementing solar and wind energy to form the main body of the final energy system. Compared to long-haul truck transportation, hydrogen pipelines offer advantages such as high transport capacity, long transport distance, high transport efficiency, and long service life. Pipeline hydrogen transportation is considered the main mode of hydrogen transportation in the future; however, the investment and construction cost of pure hydrogen pipelines is approximately 5-6 million yuan per kilometer, requiring a significant initial investment.

[0003] Considering the issues of low cost and high efficiency, alternative routes are being explored beyond pure hydrogen pipeline transportation, gradually developing pipeline transportation with different hydrogen blending ratios. Hydrogen-blended natural gas pipeline transportation can achieve low-cost and high-efficiency hydrogen transportation and has become the mainstream direction for hydrogen transportation.

[0004] During long-term transportation, hydrogen inevitably enters the interior of pipes, elbows, welds, tees, valves, and seals in hydrogen-blended natural gas pipelines, causing damage. Therefore, optimized selection of pipeline materials, especially seals, is necessary. Currently, the suitability evaluation of non-metallic seals for hydrogen-blended natural gas pipelines is still in its initial stages and largely lacks support for selecting appropriate non-metallic seals.

[0005] Therefore, in order to ensure the long-term safe use of non-metallic seals for hydrogen-blended natural gas pipelines, it is urgent to develop a suitability evaluation method for non-metallic seals used in hydrogen transportation pipelines. Summary of the Invention

[0006] The purpose of this invention is to provide a method for evaluating the suitability of non-metallic seals for hydrogen transportation pipelines, addressing the issue of suitability evaluation for non-metallic seals for hydrogen transportation pipelines.

[0007] This invention is achieved through the following technical solution: A method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines includes the following steps: S1. Obtain the evaluation index system, which includes primary, secondary, and tertiary indicators. The primary indicator is the operational risk of non-metallic seals under hydrogen doping conditions. The secondary indicators include the physicochemical performance parameters, operating parameters, and management level under hydrogen doping conditions. Each secondary indicator is further divided into several tertiary indicators. Each secondary and tertiary indicator has a corresponding weight. Each tertiary indicator has a corresponding scoring criterion and set of comments. S2, Test non-metallic seals under hydrogen doping conditions to obtain data on each tertiary index corresponding to the physicochemical performance parameters; Obtain data on each tertiary index corresponding to the operating parameters and management level; S3. Based on the data of all tertiary indicators and the corresponding scoring criteria, score each tertiary indicator to obtain the scoring results; based on the scoring results and the set of comments, establish the membership matrix of the tertiary indicators in each secondary indicator. S4. Based on the membership matrix of the tertiary indicators in each secondary indicator and the weights corresponding to the tertiary indicators, calculate the evaluation matrix of each secondary indicator; based on the evaluation matrix of the secondary indicators and the weights corresponding to the secondary indicators, calculate the evaluation result of the primary indicator. S5, based on the evaluation results of the primary indicators and the pre-defined suitability level standard range, obtains the suitability level of the non-metallic seal.

[0008] Preferably, in S1, the three-level indicators corresponding to the physicochemical performance parameters include at least two of the following: leakage rate, explosion resistance, and anti-aging performance.

[0009] Preferably, in S1, the three-level indicators corresponding to the operating parameters include at least two of the following: service time, service pressure, ambient temperature, and gas composition.

[0010] Preferably, in S1, each of the three-level indicators corresponding to the management level includes at least two of personnel management, operational parameters, and emergency management.

[0011] Preferably, in S1, the weights of the secondary and tertiary indicators are determined using the structural entropy weighting method.

[0012] The preferred set of comments is as follows: .

[0013] Preferably, in S2, the three-level indicators corresponding to the physicochemical performance parameters include at least two of leakage rate, explosion resistance and aging resistance; the non-metallic seal is tested under hydrogen doping conditions, specifically at least two of hydrogen doping sealing test, hydrogen doping explosion resistance test and hydrogen doping aging test.

[0014] Preferably, S4 specifically includes: Based on the membership matrix of the tertiary indicators in each secondary indicator and the weights of the tertiary indicators, an evaluation matrix for each secondary indicator is established. Based on the evaluation matrix of each secondary indicator and the weight of the secondary indicators, an evaluation matrix for the primary indicators is established. The evaluation results of the primary indicators are obtained based on the evaluation matrix and comment set of the primary indicators.

[0015] Furthermore, the evaluation results of the primary indicators are obtained from the evaluation matrix and comment set based on the primary indicators, specifically as follows: The set of comments is converted into an evaluation level matrix. The evaluation matrix of the primary indicator is multiplied by the evaluation level matrix to obtain the evaluation result of the primary indicator.

[0016] Preferably, in S5, the pre-divided applicability level standard intervals are (0,1], (1,2], (2,3], (3,4], which correspond to applicability levels of excellent, good, medium, and poor, respectively.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention considers the physicochemical properties of hydrogen-doped non-metallic sealing components. Combining the actual operating conditions of hydrogen transmission pipelines and the surrounding external environment, it comprehensively analyzes the physicochemical properties of hydrogen-doped non-metallic sealing components from three aspects: operating parameters, and management level. For the first time, it constructs a suitability evaluation index system and specific index scoring criteria for non-metallic sealing components used in hydrogen transmission pipelines. This provides an evaluation method for the suitability evaluation of non-metallic sealing components used in hydrogen transmission pipelines, and can provide strong support for the selection of the best non-metallic sealing components during the construction phase and the suitability evaluation of non-metallic sealing components during the operation phase. By using the suitability evaluation method for non-metallic sealing components used in hydrogen transmission pipelines established by this invention, the superiority or inferiority of the three-level indicators can be controlled, avoiding certain factors from affecting the operational safety of non-metallic sealing components. The evaluation process is easy to implement, and the evaluation classification is clear. This invention adopts a suitability evaluation model based on fuzzy comprehensive evaluation, which can avoid fuzziness and uncertainty in the evaluation process. The obtained evaluation results can be applied to actual field operations, providing technical support for the long-term safe operation of non-metallic sealing components used in hydrogen transmission pipelines.

[0018] Furthermore, this invention comprehensively analyzes the hydrogen-doped sealing performance, hydrogen-doped explosion resistance, and hydrogen-doped aging resistance of non-metallic seals, which can avoid the impact of high hydrogen leakage rate, poor explosion resistance, and poor aging resistance on the operational safety of non-metallic seals. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the method for evaluating the suitability of non-metallic sealing components for hydrogen pipelines according to the present invention.

[0021] Figure 2This is a schematic diagram of the suitability evaluation index system for non-metallic sealing components used in hydrogen transportation pipelines in an embodiment of the present invention. Detailed Implementation

[0022] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0023] It should be noted that the process equipment or apparatus not specifically mentioned in the following embodiments are all conventional equipment or apparatus in the art.

[0024] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not intended to limit the order of the method steps or define the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0025] This invention discloses a method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines, comprising the following steps: S1. Obtain the evaluation index system, which includes primary, secondary, and tertiary indicators. The primary indicator is the operational risk of non-metallic seals under hydrogen doping conditions. The secondary indicators include the physicochemical performance parameters, operating parameters, and management level under hydrogen doping conditions. Each secondary indicator is further divided into several tertiary indicators. Each secondary and tertiary indicator has a corresponding weight. Each tertiary indicator has a corresponding scoring criterion and set of comments. S2, Test non-metallic seals under hydrogen doping conditions to obtain data on each tertiary index corresponding to the physicochemical performance parameters; Obtain data on each tertiary index corresponding to the operating parameters and management level; S3. Based on the data of all tertiary indicators and the corresponding scoring criteria, score each tertiary indicator to obtain the scoring results; based on the scoring results and the set of comments, establish the membership matrix of the tertiary indicators in each secondary indicator. S4. Based on the membership matrix of the tertiary indicators in each secondary indicator and the weights corresponding to the tertiary indicators, calculate the evaluation matrix of each secondary indicator; based on the evaluation matrix of the secondary indicators and the weights corresponding to the secondary indicators, calculate the evaluation result of the primary indicator. S5, based on the evaluation results of the primary indicators and the pre-defined suitability level standard range, obtains the suitability level of the non-metallic seal.

[0026] Specifically, the method for evaluating the suitability of non-metallic sealing components for hydrogen pipelines according to the present invention includes the following steps: The first step is to analyze the physicochemical properties of different non-metallic seals under hydrogen-doped conditions, such as leakage rate, aging performance, and explosion resistance. At the same time, considering the management level and operating parameters of non-metallic seals used in hydrogen pipelines, including low-temperature brittleness and gas composition, an evaluation index system for the suitability of non-metallic seals used in hydrogen pipelines is constructed.

[0027] The second step involves determining primary, secondary, and tertiary indicators to establish a suitability evaluation index system for non-metallic seals under hydrogen-doped conditions. The primary indicator is the operational risk (P) of the non-metallic seal under hydrogen-doped conditions. Secondary indicators include physicochemical performance parameters (P1), operational parameters (P2), and management level (P3). Tertiary indicators include leakage rate (P...). 11 Explosion-resistant performance P 12 Anti-aging properties P 13 Service time P 21 Service pressure P 22 Ambient temperature P 23 Gas component P 24 Personnel Management P 31 Operating parameter P 32 Emergency Management P 33 Where P = (P1, P2, P3), P1 = (P... 11 ,P 12 ,P 13 P2 = (P 21 ,P 22 ,P 23 ,P 24 P3 = (P 31 ,P 32 ,P 33 ).

[0028] Third, the evaluation index system can not only be used for hazard identification, but also for quantitative assessment. For this purpose, corresponding scoring criteria are established for each tertiary index, as shown in Table 1.

[0029] Table 1 Scoring Criteria for Level 3 Indicators

[0030] The fourth step is to rank the importance of the secondary and tertiary indicators. Based on the ranking results, the structural entropy weighting method is used to determine the weights of each level of indicator.

[0031] (1) Collect the ranking opinions of three groups of evaluators on the importance of each indicator, and form the ranking number of indicator importance. . This represents the importance ranking number of the j-th tertiary indicator among the i-th secondary indicators.

[0032] (2) Analysis of average recognition and blindness of typical ranking of indicator weights.

[0033] The membership function for event ordering is: (1) In the formula, x Give the event to all evaluators Qualitative ranking number, It corresponds to the sort number x membership function value b ij λ is the transformation parameter, λ=j+2.

[0034] Assume the three groups of evaluators have equal say. Assume the three groups of evaluators have equal say in the event. The consensus is called the average recognition rate. b j The calculation process is as follows: (2) in, This represents the importance ranking number of the j-th tertiary indicator within the i-th secondary indicator. x The membership function values, i=1,2,3; then Let represent the membership matrix of the weights of the i-th secondary indicator, where n is the number of tertiary indicators in the i-th secondary indicator. Then, the average recognition rate of the typical ranking results from the three groups of evaluators is . b j The maximum recognition value is b i .

[0035] Blindness The calculation method is as follows: (3) Where m equals i, representing the number of evaluators.

[0036] (3) Weight normalization processing, the evaluator's weight for a certain event Overall understanding for: (4) Will After normalization, the final weight of the j-th tertiary indicator is: (5) Using the structural entropy weighting method to quantify the ranking results of indicator importance can avoid uncertainties in the indicator weighting process.

[0037] The fifth step is to establish a set of comments. Based on the actual situation of non-metallic seals used in hydrogen pipelines, the comments for secondary and tertiary indicators are divided into four levels, forming the comment set:

[0038] Step 6: Convert the set of comments into an evaluation level matrix, as follows:

[0039] Step 7: Divide the applicability level standard intervals. Divide the evaluation results of the primary indicators into different applicability level standard intervals: (0,1], (1,2], (2,3], (3,4], which correspond to the levels of excellent, good, average, and poor, respectively.

[0040] Step 8: Establish a membership matrix. Based on the scoring criteria in Table 1, score the third-level index parameters of non-metallic seals. Based on the scoring results and comment sets of the third-level indicators, establish a membership matrix for the grading of the third-level indicators in each second-level indicator. . i represents the i-th secondary indicator, This represents the membership degree of the j-th tertiary indicator within the i-th secondary indicator to each level in the grading criteria. Let n represent the membership matrix of the tertiary indicators in the i-th secondary indicator of a non-metallic seal, where n represents the number of tertiary indicators in the i-th secondary indicator.

[0041] Step 9: Based on the membership matrix of the tertiary indicators in the secondary indicators and the weights of the tertiary indicators, calculate the evaluation matrices for the primary and secondary indicators, and the evaluation matrix for the primary indicators. The secondary indicator evaluation matrix is ​​as follows: , .

[0042] Step 10: Based on the evaluation matrix and rating matrix of the primary indicators, as well as the applicability rating standard range, obtain the applicability rating of non-metallic seals for hydrogen pipelines.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] Example A survey of the types of sealing components used in valves and other materials at long-distance hydrogen-blended natural gas stations revealed that these components are made of materials such as fluororubber, nitrile rubber, nylon, graphite, and polytetrafluoroethylene (PTFE). Based on the field application and future prospects of each material, five categories were selected as the preferred choices: fluororubber, nitrile rubber, nylon, graphite-PTFE, and para-polystyrene-PTFE. The applicability evaluation method of this invention will be specifically described using fluororubber under 5% hydrogen blending conditions as an example.

[0045] See Figure 1 The suitability evaluation method for non-metallic seals used in hydrogen pipelines in this embodiment includes the following steps: The first step established a two-tiered indicator system encompassing physicochemical performance parameters, operational parameters, and management level. Physicochemical performance parameters included leakage rate, explosion resistance, and aging resistance; operational parameters included service time, service pressure, ambient temperature, and gas composition; and management level included personnel management, operational parameters, and emergency management. The constructed suitability evaluation indicator system for non-metallic sealing components used in hydrogen pipelines is as follows: Figure 2 As shown.

[0046] The second step involves constructing an evaluation index system. The primary index is the operational risk (P) of non-metallic seals under hydrogen doping conditions. Secondary indices include physicochemical performance parameters (P1), operational parameters (P2), and management level (P3). Tertiary indices include leakage rate (P). 11 Explosion-resistant performance P 12 Anti-aging properties P 13 Service time P 21 Service pressure P 22 Ambient temperature P 23 Gas component P 24 Personnel Management P 31 Operating parameter P 32 Emergency Management P 33 Where P = (P1, P2, P3), P1 = (P... 11 ,P12 ,P 13 P2 = (P 21 ,P 22 ,P 23 ,P 24 P3 = (P 31 ,P 32 ,P 33 ).

[0047] The third step is to establish corresponding scoring criteria for each of the three-level indicators in the evaluation index system, which can be used not only for hazard identification but also for quantitative assessment. See Table 1 for details.

[0048] The fourth step is to rank the importance of the secondary and tertiary indicators. Based on the ranking results, the structural entropy weighting method is used to determine the weights of each level of indicator.

[0049] Three groups of experts from the fields of non-metallic sealing component physicochemical properties, operation management, and personnel management were selected to rank the importance of secondary and tertiary indicators. Based on the importance ranking results, the structural entropy weight method was used to determine the weights of each level of indicator. The specific calculation parameters for the weights of secondary indicators include average recognition rate, blindness, overall recognition, and normalized weight. The specific parameter calculation results are shown in Table 2.

[0050] Table 2. Calculation results of the entropy weight method for the secondary index structure.

[0051] Similar to the solution process in Table 2, the tertiary indicators under each secondary indicator were calculated using the structural entropy weight method, and the results are shown in Table 3.

[0052] Table 3 Weights of Level 3 Indicators

[0053] The fifth step is to establish a set of comments. Based on the actual situation of non-metallic seals used in hydrogen pipelines, the comments for secondary and tertiary indicators are divided into four levels. The set of comments is as follows:

[0054] Step 6: Convert the set of comments into an evaluation level matrix, as follows:

[0055] The seventh step is to divide the applicability level standard ranges. The evaluation results of the primary and secondary indicators are divided into different applicability level standard ranges as (0,1], (1,2], (2,3], and (3,4], which correspond to the levels of excellent, good, average, and poor, respectively.

[0056] Step 8: Establish a membership matrix. Based on the scoring criteria in Table 1 and the data of each tertiary indicator, score each tertiary indicator of the non-metallic seal. Based on the scoring results and comment set of the tertiary indicators, establish a membership matrix for the tertiary indicators in each secondary indicator. .

[0057] Taking fluororubber as an example, hydrogen-doped sealing tests, hydrogen-doped anti-explosion tests, and hydrogen-doped aging tests were conducted to obtain data on physicochemical properties (including leakage rate P). 11 Explosion-resistant performance P 12 Anti-aging properties P 13 We obtained data for each of the three-level indicators corresponding to the operating parameters and management level. Ten experts from different fields were invited to score the three-level indicators, as shown in Table 4 below.

[0058] Table 4. Summary of Comments for Level 3 Indicators

[0059] Based on the scoring results and the set of comments, a membership matrix for the tertiary indicators in each secondary indicator is established, as shown below:

[0060]

[0061]

[0062] Step 9: Calculate the evaluation matrices for the primary and secondary indicators based on the membership matrix of the tertiary indicators within the secondary indicators and the weights of the tertiary indicators. The evaluation matrix for the secondary indicators is as follows: i=1,2,3 Evaluation matrix of primary indicators , This indicates the weight of the secondary indicator.

[0063] Based on the membership matrix of the tertiary indicators in each secondary indicator and the weights of the tertiary indicators, establish the P of each secondary indicator. i Evaluation matrix for:

[0064]

[0065]

[0066] Therefore, the evaluation matrix of the primary indicator can be obtained based on the evaluation matrix of the secondary indicator and the corresponding weights of the secondary indicator. for:

[0067]

[0068] Step 10: Based on the evaluation matrix and rating matrix of the primary indicators, as well as the applicability rating standard range, obtain the applicability rating of non-metallic seals for hydrogen pipelines.

[0069] Based on the evaluation matrix and rating level matrix of the secondary indicators, the evaluation results of each secondary indicator are... for:

[0070] The evaluation results of the secondary indicators can intuitively display the evaluation level of each secondary indicator, for example... E 1 represents the difference. E 2 is good. E 3 is considered moderate.

[0071] Based on the evaluation matrix and rating level matrix of the primary indicators, the evaluation results of the primary indicators are as follows: for:

[0072] Based on the evaluation results of the primary indicators and comparing them with the standard range for suitability grades, fluororubber is classified as having a medium suitability grade under 5% hydrogen doping conditions. Similar to the calculation process above, nitrile rubber, nylon, graphite-PTFE, and para-polystyrene-PTFE were also evaluated separately, resulting in the following suitability grades for non-metallic seals: Table 5 Risk Level Assessment Results for Seals Made of Different Materials

[0073] Based on the hydrogen doping performance test and applicability evaluation model for non-metallic seals, it can be seen that in soft seals, nitrile rubber is better than fluororubber and is at a good level; in hard seals, nylon, graphite-PTFE, and para-polystyrene-PTFE are all at a good level. Comparing the evaluation results E, 1.5988 < 1.7141 < 1.7845, that is, the ranking of the plastics is: graphite-PTFE < para-polystyrene-PTFE < nylon.

[0074] As can be seen from the above, this invention comprehensively analyzes the physical and chemical properties, operating parameters, and management level of hydrogen-doped sealing components, and for the first time constructs an evaluation index system and specific index scoring criteria for the applicability of non-metallic sealing components for hydrogen transportation pipelines. The applicability evaluation model based on fuzzy comprehensive evaluation and structural entropy weight method includes the evaluation index system for the applicability of non-metallic sealing components for hydrogen transportation pipelines, specific index scoring criteria, average recognition degree, blindness, overall understanding and normalization processing of index importance ranking, construction of combined comments, calculation of membership degree matrix, calculation of evaluation matrix and determination of applicability level.

[0075] This invention establishes a suitability evaluation method for non-metallic seals used in hydrogen pipelines, filling a gap in the evaluation of the operational suitability of such seals. It has been applied in the field, and the evaluation results are consistent with actual field conditions, providing a judgment strategy for material selection of non-metallic seals for hydrogen-blended natural gas pipelines. This method avoids key indicators affecting the operational safety of non-metallic seals, such as high hydrogen-blended leakage rates, poor explosion resistance, poor aging resistance, and poor low-temperature brittleness. The evaluation process is easy to execute, and the evaluation grading is clear. The suitability evaluation model based on fuzzy comprehensive evaluation and structural entropy weighting avoids fuzziness and uncertainty in the evaluation process. The obtained suitability grade results can be applied to actual field conditions, providing technical support for the long-term safe operation of non-metallic seals used in hydrogen pipelines. This invention develops a suitability evaluation model based on hydrogen-blended physicochemical properties, fuzzy comprehensive evaluation, and structural entropy weighting.

[0076] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines, characterized in that, Includes the following steps: S1. Obtain the evaluation index system, which includes primary, secondary, and tertiary indicators. The primary indicator is the operational risk of non-metallic seals under hydrogen doping conditions. The secondary indicators include the physicochemical performance parameters, operating parameters, and management level under hydrogen doping conditions. Each secondary indicator is further divided into several tertiary indicators. Each secondary and tertiary indicator has a corresponding weight. Each of the three-level indicators has a corresponding set of scoring criteria and comments; S2, Test non-metallic seals under hydrogen doping conditions to obtain data on each tertiary index corresponding to the physicochemical performance parameters; Obtain data on each tertiary index corresponding to the operating parameters and management level; S3. Based on the data of all tertiary indicators and the corresponding scoring criteria, score each tertiary indicator to obtain the scoring results; based on the scoring results and the set of comments, establish the membership matrix of the tertiary indicators in each secondary indicator. S4. Based on the membership matrix of the tertiary indicators in each secondary indicator and the weights corresponding to the tertiary indicators, calculate the evaluation matrix of each secondary indicator; based on the evaluation matrix of the secondary indicators and the weights corresponding to the secondary indicators, calculate the evaluation result of the primary indicator. S5, based on the evaluation results of the primary indicators and the pre-defined suitability level standard range, obtains the suitability level of the non-metallic seal.

2. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, In S1, the tertiary indicators corresponding to the physicochemical performance parameters include at least two of the following: leakage rate, explosion resistance, and anti-aging performance.

3. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, In S1, the three-level indicators corresponding to the operating parameters include at least two of the following: service time, service pressure, ambient temperature, and gas composition.

4. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, In S1, each of the three-level indicators corresponding to the management level includes at least two of personnel management, operational parameters, and emergency management.

5. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, In S1, the weights of the secondary and tertiary indicators are determined using the structural entropy weighting method.

6. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, The collection of comments is as follows: .

7. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, In S2, the three-level indicators corresponding to the physical and chemical performance parameters include at least two of the following: leakage rate, explosion resistance, and aging resistance; the non-metallic seals are tested under hydrogen doping conditions, specifically at least two of the following: hydrogen doping sealing test, hydrogen doping explosion resistance test, and hydrogen doping aging test.

8. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, S4 specifically includes: Based on the membership matrix of the tertiary indicators in each secondary indicator and the weights of the tertiary indicators, an evaluation matrix for each secondary indicator is established. Based on the evaluation matrix of each secondary indicator and the weight of the secondary indicators, an evaluation matrix for the primary indicators is established. The evaluation results of the primary indicators are obtained based on the evaluation matrix and comment set of the primary indicators.

9. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 8, characterized in that, The evaluation matrix and comment set based on the primary indicators yield the evaluation results of the primary indicators, specifically as follows: The set of comments is converted into an evaluation level matrix. The evaluation matrix of the primary indicator is multiplied by the evaluation level matrix to obtain the evaluation result of the primary indicator.

10. The method for evaluating the suitability of non-metallic sealing components for hydrogen transportation pipelines according to claim 1, characterized in that, In S5, the pre-divided applicability level standard intervals are (0,1], (1,2], (2,3], (3,4], which correspond to applicability levels of excellent, good, medium, and poor, respectively.

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