Oil and gas storage and transportation station safety grade evaluation method based on cloud fuzzy analytic hierarchy process
Technical Field
The invention belongs to the technical field of oil and gas storage and transportation safety, and particularly relates to an oil and gas storage and transportation station safety grade evaluation method based on a cloud fuzzy analytic hierarchy process.
Background
With the continuous promotion of the modern construction of our country, the petrochemical industry has become an important component in the industrial economy of our country. The use amount of energy sources such as petroleum, natural gas and the like is increased year by year, and the economic development is promoted, and meanwhile, serious potential safety hazards are brought. In the petroleum industry, oil and gas storage and transportation stations are hubs connecting production links, and the safety problem is more and more emphasized. During the storage, transportation and production of oil and gas, the leakage of materials can easily cause disastrous accidents such as fire, explosion, personnel poisoning and the like. Therefore, providing reliable safety level diagnosis results of the oil and gas storage and transportation station has great significance for the safe production of the oil and gas storage and transportation station.
In recent years, researchers at home and abroad have been striving to advance The development of Safety assessment theory to support and guide Safety analysis in hazardous production sites (Song Q et al, The application of closed model combined with a nonlinear and analytical Process [ J ]. Process Safety and Environmental Protection, 2021, 145: 12-22). With the development of interdisciplines of fuzzy mathematics, information science, management science, etc., most studies, such as the "a adaptation for environmental breakdown of engineered nanomaterials using Analytical Hierarchy Process (AHP) and fuzzy information science [ J ] environmental international, 2016, 92: 334-347, yoyo fly et al "risk assessment of air traffic safety based on entropy weight and fuzzy analysis [ J ]. aeronautical computing techniques, 2013, 43 (04): 1-5, witch et al "a set of comprehensive safety evaluation methods [ P ] applied to safety pre-evaluation: CN104915888A, 2015-09-16, Aicong et al, "a comprehensive pipe gallery operation management safety evaluation method [ P ]. Zhejiang province: CN111738612A, 2020-10-02 adopts analytic hierarchy process as multi-criterion decision tool to determine security level. The method has the advantages of small calculated amount, simple process and easy operation. However, the analytic hierarchy process lacks quantitative analysis, is highly subjective, and only gives relative risk. An oil and gas storage and transportation station is a production system with a complex structure, and the traditional analytic hierarchy process cannot perform quantitative comprehensive evaluation on the complex structure system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an oil and gas storage and transportation station safety level evaluation method based on a cloud fuzzy analytic hierarchy process, and a multi-level comprehensive evaluation structure for oil and gas storage and transportation station safety evaluation is constructed by comprehensively considering 4 main safety influence factors in management, personnel, facilities and environment. And finally, a reliable safety level quantization result of the oil and gas storage and transportation station is provided through similarity, so that potential safety hazards can be found in time in the oil and gas storage and transportation station, positive improvement is realized, and accidents are avoided.
In order to achieve the purpose of the invention, the safety grade evaluation method of the oil and gas storage and transportation station based on the cloud fuzzy analytic hierarchy process comprises the following steps:
acquiring basic information, including acquiring safety influence factor information in 4 aspects of management, personnel, facilities and environment;
a multilevel comprehensive evaluation structure for safety evaluation of an oil and gas storage and transportation station is constructed, and main factors and sub-index factors of a lower layer belonging to each main factor are determined;
determining an index comment variable value and correspondingly determining an index comment variable value interval;
generating a standard cloud based on the index comment variable value interval;
calculating to obtain the comprehensive weight of the sub-index factors;
the expert scores the indexes and collects scoring data;
generating a comprehensive cloud based on the sub-index factor comprehensive weight and the grading data;
similarity calculation is carried out on the standard cloud and the comprehensive cloud;
and comparing the obtained similarity value with the index comment variable value interval, and judging the safety level of the oil and gas storage and transportation station.
Further, the main factors in step 2 include management, personnel, facilities and environment, and the sub-index factors belonging to the lower layer of each main factor include:
the main management factors comprise three sub-index factors of a safety operation procedure, a supervision and inspection system and a safety policy;
the main factors of the personnel comprise four sub-index factors of pre-post training, personnel allocation, fatigue, skill and knowledge;
the main factors of the facility comprise four sub-index factors of facility layout, maintenance condition, measurement instrument inspection and corrosion resistance of the facility;
the main environmental factors include four sub-index factors of temperature, humidity, noise and sanitary condition.
Further, the index comment variable value interval is established, the safety level of the oil and gas storage and transportation station is qualitatively described, and then a quantization value interval is set for each level.
Further, the determining an index comment variable value and correspondingly determining an index comment variable value interval includes:
the index comment variable is qualitative description of the safety level of the oil and gas storage and transportation station and is determined as 'poor', 'normal', 'good' and 'excellent', and the quantitative value intervals of all levels are respectively defined as [0, 4 ], [4, 7 ], [7, 9) and [9, 10 ].
Further, the generating a standard cloud specifically includes:
calculating standard cloud digital features according to the index comment variable interval, wherein the standard cloud digital features comprise expected Ex, entropy En and super-entropy He, the expected Ex represents distribution of qualitative description in a domain of discourse, the entropy En reflects randomness and fuzziness of a qualitative concept, the super-entropy He is a measure of the cohesiveness of the index comment variables, and the calculation method of the digital features comprises the following steps:
He=λEn
in the formula, xmaxAnd xminRespectively indicating an upper limit and a lower limit of a variable interval of the comment; λ is a coefficient for expressing a linear relationship between entropy En and super entropy He;
inputting standard cloud digital feature expectation Ex, entropy En and super-entropy He into a forward cloud generator, and outputting N cloud drops Drop (x) by the forward cloud generatori,yi) Form a standard cloud in which yiThe calculation method of (2) is as follows:
in the formula, S is a normal random number with Ex as an expectation and He as a standard deviation.
Further, the calculating to obtain the sub-indicator factor comprehensive weight specifically includes:
step 5.1: quantizing the importance degree of each main factor and each sub-index factor by adopting a triangular fuzzy number, respectively constructing a fuzzy consistent judgment matrix about the main factor and a fuzzy consistent judgment matrix about the sub-index factor, and respectively and correspondingly obtaining a main factor weight and a sub-index factor weight;
step 5.2: consistency check, if the two fuzzy consistent judgment matrixes are consistent, entering a step 5.3, otherwise, returning to the step 5.1 to perform importance degree comparison again;
step 5.3: and obtaining the comprehensive weight of the sub-index factors according to the weight of the main factor factors and the weight of the sub-index factors.
Further, the sub-indicator factor comprehensive weight can be obtained by multiplying the main factor weight and the sub-indicator factor weight.
Further, step 7.1: respectively calculating and evaluating cloud digital characteristics of each sub-index factor according to grading data of experts;
step 7.2: calculating the comprehensive cloud digital characteristics according to the cloud digital characteristics and the comprehensive weights of the sub index factors;
step 7.3: and the comprehensive cloud digital characteristics are used as input of a forward cloud generator to generate cloud droplets of a certain scale to form a comprehensive cloud.
Further, in the step 7.1, in the cloud digital features of each sub-index factor, the cloud digital features of any sub-index factor include an evaluation cloud expected ExedEntropy EnedEntropy of HeedThe calculation of each cloud digital feature is as follows:
wherein E is the number of experts and V is the sample variance;
further, in step 7.2, the comprehensive cloud digital characteristics are calculated according to the comprehensive weights of the evaluation cloud digital characteristics and the sub index factors, and the comprehensive cloud expectation ExsEntropy EnsEntropy of HesThe calculation method is as follows:
in the formula, D is the number of sub-index factors, omegadIs the sub-index factor integrated weight.
Further, performing similarity calculation on the standard cloud and the comprehensive cloud, specifically including:
step 8.1: randomly selecting a cloud Drop (x) in the comprehensive cloudi,yi)。
Step 8.2: calculating secondary cloud Drop (x) in a standard cloudi,θi)。
Repeating step 8.1 and step 8.2 to generate N thetaiThe similarity calculation method is as follows:
compared with the prior art, the invention can realize the following beneficial effects:
the invention combines the complex structure characteristics of the production system of the oil and gas storage and transportation station, comprehensively considers 4 main safety influence factors in the aspects of management, personnel, facilities and environment, constructs a multilevel comprehensive evaluation structure of the safety evaluation of the oil and gas storage and transportation station, is a system analysis method combining the qualitative and quantitative evaluation, simultaneously introduces the randomness and the fuzziness of the multilevel evaluation factors, can effectively avoid the subjective influence factors of experts, can provide a reliable safety level diagnosis result of the oil and gas storage and transportation station, enables the oil and gas storage and transportation station to find potential safety hazards in time, improves actively and avoids accidents.
Drawings
Fig. 1 is a schematic flow chart of a security level assessment method according to an embodiment of the present invention.
Fig. 2 is a schematic view of a multi-level comprehensive evaluation structure for safety evaluation of an oil and gas storage and transportation station in the embodiment of the invention.
Fig. 3 is a schematic diagram of a forward cloud generator according to an embodiment of the present invention.
Detailed Description
For ease of understanding, the present invention is specifically described with reference to FIGS. 1-3.
The safety grade evaluation method for the oil and gas storage and transportation station based on the cloud fuzzy analytic hierarchy process comprises the following steps:
step 1: and collecting basic information. The collection includes 4 aspects of safety influence factor information of management, personnel, facilities and environment.
Step 2: a multilevel comprehensive evaluation structure for safety evaluation of an oil and gas storage and transportation station is constructed, and 4 main factors of management, personnel, facilities and environment and 15 sub-index factors of the lower layer are determined.
In this embodiment, the sub-indicator factor of the lower layer of the main factor M includes a safety operation procedure M1Supervision and inspection system M2And security policy M3(ii) a Sub-index factors under the main factor H of the personnel include pre-post training H1Staffing equipment H2Fatigue degree H3And skill and knowledge H4(ii) a Facility principal factor F underlying factors including facility layout F1Maintenance condition F2Measurement instrument test F3And facility corrosion resistance F4(ii) a Environmental main factor E the factors underlying layer include temperature E1Humidity E2Noise E3And sanitary conditions E4。
And step 3: and determining an index comment variable value, and correspondingly determining an index comment variable value interval. The safety level of the oil and gas storage and transportation station is qualitatively described, namely index comment variables are determined, and then a quantitative value interval is set for each index comment variable.
In this embodiment, "poor", "general", "good", and "excellent" are used as qualitative descriptions of the security level of the oil and gas storage and transportation yard, and the quantization value intervals of each level are defined as [0, 4 ], [4, 7 ], [7, 9 ], and [9, 10 ], respectively. It should be understood that other indicator comment variables and intervals may be set in other embodiments.
And 4, step 4: generating a standard cloud specifically as follows:
step 4.1: calculating standard cloud digital characteristics according to the index comment variable value interval, wherein the standard cloud digital characteristics comprise: ex, entropy En, super entropy He is expected. Wherein, it is expected that Ex represents the distribution of qualitative description of the security level in the domain of discourse, entropy En reflects the randomness and ambiguity of the qualitative description of the security level, and super-entropy He is the measure of the cohesiveness of the index variable, and each digital feature calculation method is as follows:
He=λEn
in the formula, xmaxAnd xminRespectively indicating an upper limit and a lower limit of a variable interval of the comment; λ is a coefficient for expressing a linear relationship between En and He. The quantization intervals are calculated as a whole, so that x in the present inventionmax=10,xmin=0。
Step 4.2: and generating cloud drops of a certain scale by using a forward cloud generator to form a standard cloud. The input of the forward cloud generator is 3 standard cloud digital features, and the output is N cloud Drop (x)i,yi) Formation of a standard cloud, xi,yiRepresenting the position of the cloud droplet in the universe of discourse. Wherein, yiThe calculation method of (2) is as follows:
in the formula, S is a normal random number with Ex as an expectation and He as a standard deviation.
And 5: calculating the index factor weight specifically as follows:
step 5.1: and respectively calculating the weights of the main index factors and the sub index factors. Comparing the importance of index factors pairwise, wherein each index factor is only compared with the factor of the same layer, and determining the index factors according to a triangular fuzzy 9-scale methodThe relative degree of importance. Wherein, the scale is
Indicating that the index factor A and the index factor B have the same importance; scale division
Indicating that index factor a is slightly more important than index factor B; scale division
Indicating that index factor A is more important than index factor B; scale division
The index factor A is obviously more important than the index factor B; scale division
Indicating that index factor a is more important than index factor B. Other scales
Is an intermediate importance between the scales described above. Scale division
To
Represented by triangular blur numbers. After all index factors are compared pairwise, a fuzzy consistent judgment matrix can be established, and the obtained mean value of the fuzzy importance scales is the factor weight.
By the method, the fuzzy consistent judgment matrix related to the main factor and the fuzzy consistent judgment matrix related to the sub-index factor can be obtained respectively, and the main factor weight and the sub-index factor weight are obtained correspondingly.
Step 5.2: and (5) consistency check, if the two fuzzy consistency judgment matrixes are consistent, entering a step 5.3, and if not, returning to the step 5.1 to perform importance degree comparison again.
Step 5.3: and calculating the sub index factor comprehensive weight. The sub-indicator factor integrated weight is obtained by multiplying the main indicator factor weight and the sub-indicator factor weight obtained in step 5.1.
Step 6: and inviting experts to score the indexes, scoring each index of the evaluation object by the experts according to own experience, and collecting scoring data.
And 7: generating a comprehensive cloud, which comprises the following specific steps:
step 7.1: and respectively calculating and evaluating the cloud digital characteristics of each sub-index factor according to the grading data of the experts. For any sub-index factor d, the evaluation cloud expectation Ex thereofedEntropy EnedEntropy of HeedThe calculation method is as follows:
wherein E is the number of experts, V is the sample variance, ExeIs desired for the sample.
Step 7.2: and calculating the comprehensive cloud digital characteristics according to the cloud digital characteristics and the comprehensive weight of the sub index factors. Synthetic cloud expectation ExsEntropy EnsEntropy of HesThe calculation method is as follows:
in the formula, D is the number of sub-index factors.
Step 7.3: and the comprehensive cloud digital characteristics are used as input of a forward cloud generator to generate cloud droplets of a certain scale to form a comprehensive cloud.
And 8: and calculating the similarity. The method comprises the following specific steps:
step 8.1: randomly selecting a cloud Drop (x) in the comprehensive cloudi,yi)。
Step 8.2: calculating secondary cloud Drop (x) in a standard cloudi,θi),θiIs to distinguish from yiI.e. for the same xiIn the integrated cloud, cloud Drop (x) is generatedi,yi) In the standard cloud, a secondary cloud Drop (x) is generatedi,θi)。
Repeating step 8.1 and step 8.2 to generate N thetaiThe similarity calculation method is as follows:
and step 9: and judging the security level of the oil and gas storage and transportation station by comparing the similarity of the comprehensive cloud and the standard cloud.
The temporal security level is "poor";
the temporal security level is "normal";
the temporal security level is "good";
the security level is "excellent".
To sum up, in order to avoid the influence of subjectivity, the method provided by this embodiment collects, sorts and analyzes potential safety hazard footprints from a complex system structure of an oil and gas storage and transportation station, comprehensively considers 4 main safety influence factors in the aspects of management, personnel, facilities and environment, constructs a multilevel comprehensive evaluation structure for evaluating the safety level of the oil and gas storage and transportation station, obtains a sub-index factor comprehensive weight by adopting fuzzy consistency discrimination matrix calculation, and performs similarity calculation through the generated standard cloud and comprehensive cloud to finally obtain a quantitative result of the safety level of the oil and gas storage and transportation station. The method combines the qualitative evaluation with the quantitative evaluation, and introduces the randomness and the fuzziness of multi-level evaluation factors, so that the subjective influence factors of experts can be effectively avoided, and the reliable safety level diagnosis result of the oil and gas storage and transportation station can be provided, so that the oil and gas storage and transportation station can find potential safety hazards in time, actively improve and avoid accidents.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.