Method for determining gas leakage area and leakage degree in production device of petrochemical enterprise

Abstract

The embodiment of the invention provides a method for determining a gas leakage area and leakage degree in a production device of a petrochemical enterprise, and relates to the field of gas leakage monitoring. The method comprises the steps that gas detectors with the maximum concentration value monitored in the current time period exceeding an effective sensing threshold value serve as leakage sensing detectors, and a leakage sensing detector set is obtained; identifying a leakage associated detector set according to the distance relationship with the leakage sensing detectors in the leakage sensing detector set; and constructing a three-dimensional space according to the positions of the gas detectors in the leakage associated detector set, and obtaining a leakage area according to the three-dimensional space. According to the embodiment of the invention, the identification efficiency and the identification accuracy of the leakage area and the leakage degree are improved.

Description

Technical Field

[0001] The present invention relates to the field of gas leakage monitoring, and particularly to a method for determining a gas leakage area in a production device of a petrochemical enterprise, a method for determining the degree of gas leakage in a production device of a petrochemical enterprise, a device for determining a gas leakage area in a production device of a petrochemical enterprise, an electronic device, and a computer-readable storage medium. Background Art

[0002] Refining and chemical process media have characteristics such as high temperature, high pressure, flammable, explosive, toxic, and harmful. Once leaked, it is extremely easy to cause various hazards such as safety, environment, and health. Therefore, accurately identifying leaks, clarifying the leakage area, and obtaining leakage degree information have always been the unremitting pursuit goals of petrochemical enterprises.

[0003] According to the requirements of GBT 50493-2019 "Design Standard for Detection and Alarm of Combustible and Toxic Gases in Petrochemical Industry", in order to ensure the production safety of the device and strengthen the effective monitoring of gas leakage in the device, a sufficient number of gas detectors (such as combustible gas detectors, toxic gas detectors, etc.) need to be arranged in the production device of the petrochemical enterprise. At the same time, the real-time monitoring data of the gas detectors is transmitted to the monitoring platform. When a leak occurs, an alarm is issued for the instruments whose monitored concentration value exceeds the set leakage threshold. For the device operators, they can only obtain the number, location, and concentration value of the alarm detectors, and it is difficult to directly identify the leakage area and evaluate the leakage degree.

[0004] In the prior art, a visualization method for emergency warning of sudden toxic gas leakage (publication number: CN112100299A) is provided. It predicts the gas diffusion range after a sudden toxic gas leakage accident in a chemical plant through the Gaussian puff model. Then, according to the prediction result of the gas diffusion range, the evacuation path planning of all citizens in the affected area is calculated. Finally, the visualization of the geographical situation around the accident, the visualization of the wind field, and the visualization of the prediction result of the gas diffusion range are output in real time. This leakage area identification method is a large-scale prediction method, which is only applicable to large-scale identification at the regional level, and relies on simulation diffusion technologies such as Gaussian diffusion, and does not effectively utilize real-time monitoring data. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a method for determining the gas leakage area and leakage degree in a production device of a petrochemical enterprise to solve some problems in the prior art.

[0006] To achieve the above purpose, the first aspect of the present invention provides a method for determining a gas leakage area in a production device of a petrochemical enterprise, the method comprising:

[0007] Take the gas detectors whose maximum detected concentration in the current time period exceeds the effective sensing threshold as leakage sensing detectors, and obtain a set of leakage sensing detectors; identify a set of leakage associated detectors according to the distance relationship with the leakage sensing detectors in the set of leakage sensing detectors; construct a three-dimensional space based on the locations of the gas detectors in the set of leakage associated detectors, and obtain a leakage area from the three-dimensional space.

[0008] Preferably, the effective sensing threshold is determined according to the maximum value among the following values: a preset multiple of the detection limit of the monitoring factor corresponding to the gas detector; the maximum concentration of the substance corresponding to the gas detector in the ambient air of the device location; the effective sensing threshold of the gas detector set according to the preset specification.

[0009] Preferably, identifying a set of leakage associated detectors according to the distance relationship with the leakage sensing detectors in the set of leakage sensing detectors includes: taking the gas detector with the maximum current value in the set of leakage sensing detectors as the leakage center detector; if the spatial distance between any leakage sensing detector in the set and the leakage center detector is less than the corresponding direct correlation distance threshold, then the leakage sensing detector is a direct associated gas detector of the leakage center detector, otherwise it is a non-direct associated gas detector; if the spatial distance between any non-direct associated gas detector and a direct associated gas detector is less than the corresponding indirect correlation distance threshold, then the non-direct associated gas detector is an indirect associated gas detector of the leakage center detector; if the spatial distance between any non-direct associated gas detector and an indirect associated gas detector is less than the corresponding indirect correlation distance threshold, then the non-direct associated gas detector is also an indirect associated gas detector of the leakage center detector; obtain a set of leakage associated detectors including the leakage center detector and all its associated gas detectors; where the associated gas detectors include direct associated gas detectors and indirect associated gas detectors; obtain the result of removing the set of leakage associated detectors from the set of leakage sensing detectors, replace the set of leakage sensing detectors with the result, and identify the leakage center detector and its set of leakage associated detectors again, and perform multiple identifications until the result is an empty set and then end the identification; each set of leakage associated detectors identified during the process is an independent leakage area, there is no intersection between the sets of leakage associated detectors, and the union of all sets of leakage associated detectors is equal to the initial set of leakage sensing detectors.

[0010] Preferably, the direct correlation distance threshold is determined through the following steps: taking the substance type of the monitored object as the leaked substance, conducting a three-dimensional gas leakage diffusion experiment or simulation under set diffusion conditions to obtain the spatial concentration distribution result of the leaked substance; based on the spatial concentration distribution result, drawing an isoconcentration surface with the effective sensing threshold of the gas detector as the set value; the direct correlation distance threshold includes three parts: distance L, distance Z+, and distance Z-; taking the average value of the distance between the isoconcentration surface and the leakage source as the direct correlation distance L, taking the absolute value of the vertical distance between the highest point of the isoconcentration surface and the leakage source as the direct correlation distance Z+, and taking the absolute value of the vertical distance between the lowest point of the isoconcentration surface and the leakage source as the direct correlation distance Z-.

[0011] Preferably, if the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct correlation distance threshold, it is determined according to the following steps: defining the position coordinates (x0, y0, z0) of the leakage center detector, and the position coordinates (x i , y i , z i ) of the leakage sensing detector in the set. If it satisfies -z + < (z0 - z i ) < z - and then the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct correlation distance threshold.

[0012] Preferably, the indirect correlation distance threshold is determined through the following steps: taking the substance type of the monitored object as the leaked substance, conducting a three-dimensional gas leakage diffusion experiment or simulation under set diffusion conditions to obtain the spatial concentration distribution result of the leaked substance; according to the spatial concentration distribution result, taking the current values of two adjacent gas detectors as the set values respectively to draw the first isoconcentration surface and the second isoconcentration surface; drawing multiple straight lines from the leakage source position, intersecting with the first isoconcentration surface and the second isoconcentration surface, and taking the average value of the lengths of multiple line segments between the two surfaces as the indirect correlation distance threshold.

[0013] Preferably, if the spatial distance between the non-directly associated gas detector and the directly associated gas detector is less than the corresponding indirect correlation distance threshold, it is determined according to the following steps: defining the position coordinates (x0, y0, z0) of the leakage center detector, the position coordinates (x A , y A , z A ) of its directly associated gas detector, and the position coordinates (x j , y j , z j ) of its non-directly associated gas detector. If it satisfies -z + < (z0 - z j ) < z- and the spatial distance between the non-directly associated gas detector and the directly associated gas detector is less than the corresponding indirect association distance threshold, where JL is the indirect association distance threshold.

[0014] Preferably, the set diffusion conditions include: leakage source strength, gas leakage diffusion time, and wind speed and direction conditions.

[0015] Preferably, the gas leakage diffusion time is determined by the following steps: gas leakage diffusion time = overall response time - gas detector monitoring period - maximum communication alarm delay time; the overall response time is the maximum acceptable time interval from the occurrence of leakage to the issuance of a warning message.

[0016] The present invention also provides a method for determining the gas leakage degree in a petrochemical enterprise production device, including: determining the leakage influence range; the leakage influence range is the volume of the current leakage area, and the current leakage area is determined according to the foregoing leakage area determination method; determining the corresponding leakage degree according to a number of leakage-related parameters including the leakage influence range; and calculating and determining the leakage degree for each leakage area separately.

[0017] Preferably, the leakage-related parameters further include the leakage duration; the leakage duration is the current leakage time minus the leakage start time, and the leakage start time is obtained by the following steps: if the maximum concentration monitoring data of all leakage sensing detectors in the leakage area at any moment are all less than the leakage threshold, then that moment is a non-leakage state; the time corresponding to the last non-leakage state closest to the current leakage time is taken as the leakage start time.

[0018] Preferably, the leakage-related parameters further include: the number of leakage events, which is determined according to one leakage event corresponding to each leakage area; the concentration amplitude of each leakage event, which is determined according to the maximum value of the current concentration of each leakage sensing detector in the leakage area; and the hazard of the leaked material, which is determined according to the classification of the hazard degree of occupational exposure to toxic substances.

[0019] The present invention also provides a device for determining the gas leakage area in a petrochemical enterprise production device. The device includes: a first set determination module for obtaining a leakage sensing detector set with gas detectors whose maximum concentration monitored within the current time period exceeds the effective sensing threshold; a second set determination module for identifying a leakage associated detector set according to the distance relationship with the leakage sensing detectors in the leakage sensing detector set; and a leakage area construction module for constructing a three-dimensional space based on the positions of the gas detectors in the leakage associated detector set, and obtaining the leakage area from the three-dimensional space.

[0020] The present invention also provides a device for determining the gas leakage degree in a production device of a petrochemical enterprise. The device includes: an influence range calculation module for determining the leakage influence range, where the leakage influence range is the volume of the current leakage area, and the current leakage area is determined according to the leakage area determination method described above; and a leakage degree calculation module for determining the corresponding leakage degree according to a number of leakage-related parameters including the leakage influence range. The leakage degree is calculated separately for each leakage area.

[0021] The present invention also provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor. Wherein, the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the steps in the method described above.

[0022] The present invention also provides a non-transitory computer-readable storage medium storing computer-executable instructions for causing a computer to execute the steps in the method described above.

[0023] The present invention also provides a computer-readable storage medium storing instructions that, when run on a computer, cause the computer to execute the steps of the method described above.

[0024] The present invention also provides a computer program product including a computer program that, when executed by a processor, implements the method described above.

[0025] The above technical solutions have at least the following beneficial effects:

[0026] According to the positional relationship and real-time concentration among the gas detectors in the device, the embodiments of the present invention automatically identify the leakage area, and calculate key parameters such as the leakage influence range, duration, and leakage amplitude, and evaluate the leakage degree based on the leakage area, specifically considering the situation where multiple leakage events occur simultaneously in the device, as well as the problem that it is difficult to accurately calculate the leakage start time and duration.

[0027] For example, in the process of calculating the continuous leakage time, by comprehensively considering all the concentration monitoring data of each leakage detection detector and calculating the maximum value monitoring data, the problem that the current technical solution only records the continuous alarm time of each single gas detector and cannot obtain the continuous leakage time of the leakage event is effectively solved. At the same time, due to the large volatility of the gas detector monitoring data caused by the random diffusion of the gas cloud, the method of calculating the maximum value monitoring data solves the problem of false alarm cancellation where the leakage event is occurring but the real-time concentration monitoring data of the gas detector is small and is determined to have stopped leaking.

[0028] Other features and advantages of the embodiments of the present invention will be described in detail in the following specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and are used to explain the embodiments of the present invention together with the following specific implementation, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0030] Figure 1 Schematically shows a schematic diagram of the steps of the method for determining the gas leakage area in a petrochemical enterprise production device according to an embodiment of the present invention;

[0031] Figure 2 Schematically shows an implementation diagram of the method for determining the gas leakage area in a petrochemical enterprise production device according to an embodiment of the present invention;

[0032] Figure 3 Schematically shows a schematic diagram of the steps of the method for determining the gas leakage degree in a petrochemical enterprise production device according to an embodiment of the present invention;

[0033] Figure 4 Schematically shows a distribution diagram of the leakage detection detector set according to Embodiment 2 of the present invention;

[0034] Figure 5 Schematically shows a distribution diagram of the leakage correlation detector set according to Embodiment 2 of the present invention;

[0035] Figure 6 Schematically shows a distribution diagram of the leakage correlation detector set according to Embodiment 3 of the present invention;

[0036] Figure 7 Schematically shows a construction diagram of the three-dimensional space according to Embodiment 3 of the present invention;

[0037] Figure 8 Schematically shows a structural diagram of the device for determining the gas leakage area in a petrochemical enterprise production device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following is a detailed description of the specific implementation manners of the embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0039] Embodiment 1

[0040] Figure 1 Schematically shown is a schematic diagram of the steps of a method for determining a gas leakage area in a production device of a petrochemical enterprise according to an embodiment of the present invention, as Figure 1 shown. A method for determining a gas leakage area in a production device of a petrochemical enterprise, the method comprising:

[0041] S01. Taking the gas detectors whose maximum concentration detected in the current time period exceeds the effective sensing threshold as leakage sensing detectors to obtain a leakage sensing detector set; according to the different types of materials of the leakage monitoring object, screening all the gas detectors in the device that can monitor the material, and obtaining the spatial coordinates of the sampling port positions of each gas detector. Real-time obtaining the maximum value of the concentration monitoring data of each gas detector in the current time period (generally taking 2 - 5 minutes. Considering the complexity of gas diffusion in the production device, the concentration values detected by the gas detectors are not stable, so the maximum value within 2 - 5 minutes is taken to represent the gas concentration state at this position) as the current value. If the current value exceeds the effective sensing threshold, then the gas detector is a leakage sensing detector and forms a leakage sensing detector set; if the current values do not exceed the effective sensing threshold, it means that there is no leakage, and there is no need to identify the leakage area and evaluate the leakage degree.

[0042] S02. Identifying a leakage associated detector set according to the distance relationship with the leakage sensing detectors in the leakage sensing detector set; the leakage associated detector set is a set of gas detectors affected by the same leakage event. When only one leakage event occurs in the device, the leakage sensing detector set is the leakage associated detector set. However, the actual on-site situation is that it is impossible to predict how many leakage events have occurred, and the production device is fully capable of simultaneously detecting multiple leakage events. When multiple leakage events occur simultaneously, the established leakage sensing detector set contains multiple leakage associated detector sets. Therefore, a method for establishing a leakage associated detector set according to the leakage sensing detector set needs to be provided.

[0043] S03. Construct a three-dimensional space based on the locations of the gas detectors in the leakage correlation detector set, and obtain the leakage area from the three-dimensional space. According to the locations of the gas detectors in each leakage correlation detector set, construct a three-dimensional polyhedral space in accordance with the principle of maximizing the space volume to obtain the leakage area, and the constructed three-dimensional space should not contain non-leakage sensing detectors with values not exceeding the effective sensing threshold; the number of the leakage areas is equal to the number of the leakage correlation detector sets.

[0044] Through the above embodiments, the recognition efficiency and accuracy of the leakage interval can be improved.

[0045] In some alternative embodiments, the effective sensing threshold is determined according to the maximum value among the following values: a preset multiple of the detection limit of the monitoring factor corresponding to the gas detector, such as 5 times or more. The maximum concentration value of the substance corresponding to the gas detector in the ambient air where the device is located. The effective sensing threshold of the gas detector set according to the preset specification, and the preset specification here can be a national specification, an industry specification or an enterprise specification.

[0046] In some alternative embodiments, the distance relationship includes: being less than the direct correlation distance threshold from the leakage sensing detector; and being less than the indirect correlation distance threshold from the gas detector that meets the foregoing distance condition; and being less than the indirect correlation distance threshold from the indirectly correlated gas detector. The distinction between the above two types of correlation distance thresholds is to adapt to different diffusion scenarios and can limit the connectivity of the leakage area, so as to distinguish multiple leakage areas.

[0047] In some alternative embodiments, according to the distance relationship with the leakage sensing detectors in the leakage sensing detector set, identifying the leakage correlation detector set includes the following steps:

[0048] Step 1: Use the gas detector with the maximum current concentration value in the current leakage sensing detector set as the leakage center detector;

[0049] Step 2: Calculate the spatial distance between the leakage center detector and any leakage sensing detector in the set. If the spatial distance is less than the corresponding direct correlation distance threshold, then the leakage sensing detector is a directly correlated gas detector of the leakage center detector; otherwise, it is a non-directly correlated gas detector;

[0050] Step 3: Calculate the spatial distance between any non-directly associated gas detector and the directly associated gas detector in the set. If the spatial distance is less than the corresponding indirect association distance threshold, then the non-directly associated gas detector is an indirectly associated gas detector of the leakage center detector; calculate the spatial distance between any non-directly associated gas detector and the indirectly associated gas detector in the set. If the spatial distance is less than the corresponding indirect association distance threshold, then the non-directly associated gas detector is also an indirectly associated gas detector of the leakage center detector;

[0051] Step 4: Repeat Step 3 until all indirectly associated gas detectors are found;

[0052] Step 5: Form a leakage-associated detector set with the leakage center detector and all directly and indirectly associated gas detectors;

[0053] Step 6: Remove the gas detectors in the leakage-associated detector set from the current leakage perception detector set to form a new leakage perception detector set;

[0054] Step 7: If the new leakage perception detector set is an empty set, the identification ends; if the new leakage perception detector set has only one gas detector, then use this gas detector as the leakage-associated detector set and end the identification; otherwise, use the new leakage perception detector set as the current leakage perception detector set, return to Step 1 to execute in a loop, and continue to identify the leakage-associated detector set;

[0055] Step 8: Complete the identification of all leakage-associated detector sets.

[0056] Each leakage-associated detector set identified during the process is an independent leakage area. There is no intersection between the leakage-associated detector sets, and the union of all leakage-associated detector sets is equal to the initial leakage perception detector set.

[0057] Figure 2 Schematically shows an implementation diagram of the method for determining a gas leakage area in a petrochemical enterprise production device according to an embodiment of the present invention. As Figure 2 shown, its main steps include obtaining the position coordinates and real-time concentrations between each detector in the device, effective perception threshold judgment, leakage perception detector set, obtaining multiple leakage-associated detector sets, and corresponding multiple leakage areas according to the multiple leakage-associated detector sets.

[0058] In some alternative embodiments, the direct relevance distance threshold is determined through the following steps: taking the substance type of the monitored object as the leaked substance, setting the leakage source strength, gas leakage diffusion time, and wind speed and direction conditions, conducting an unobstructed three-dimensional gas leakage diffusion experiment or simulation, and obtaining the spatial concentration distribution result of the leaked substance; according to the spatial concentration distribution result, taking the effective sensing threshold Y of gas detector A A as the set value, drawing an isoconcentration surface; taking the average value of the distance between the isoconcentration surface and the leakage source as the direct relevance distance L, taking the absolute value of the vertical distance between the highest point of the isoconcentration surface and the leakage source as the direct relevance distance Z+, and taking the absolute value of the vertical distance between the lowest point of the isoconcentration surface and the leakage source as the direct relevance distance Z-; the direct relevance distance threshold includes three parts: distance L, distance Z+, and distance Z-.

[0059] In some alternative embodiments, when the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct relevance distance threshold, the determination is made according to the following steps: defining the position coordinates (x0, y0, z0) of the leakage center detector, and the position coordinates (x i , y i , z i ) of the leakage sensing detector in the set. If -z + <(z0 - z i ) < z- and then the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct relevance distance threshold.

[0060] In some alternative embodiments, the indirect relevance distance threshold is determined through the following steps: taking the substance type of the monitored object as the leaked substance, setting the leakage source strength, gas leakage diffusion time, and wind speed and direction conditions, conducting an unobstructed three-dimensional gas leakage diffusion experiment or simulation, and obtaining the spatial concentration distribution result of the leaked substance; to determine the indirect relevance distance threshold between gas detectors A and B, according to the spatial concentration distribution result, taking the current concentration value of gas detector A as the set value, drawing an isoconcentration surface S A ; according to the spatial concentration distribution result, taking the current concentration value of gas detector B as the set value, drawing an isoconcentration surface S B ; taking the average value of the surface distance between isoconcentration surface S A and S B as the indirect relevance distance threshold JL between gas detectors A and B; the calculation method of the average surface distance: drawing multiple straight lines from the leakage source position to intersect with isoconcentration surface S A , isoconcentration surface S B , and obtaining the average value of the lengths of multiple line segments between the two surfaces as the average surface distance.

[0061] In some alternative embodiments, the spatial distance between the non-directly associated gas detector A and the directly or indirectly associated gas detector B is less than the corresponding indirect association distance threshold, and the determination is made according to the following steps: First, based on the current concentration value of gas detector A and the current concentration value of gas detector B, the indirect association distance threshold JL between the two is determined; then, the position coordinates (x0, y0, z0) of the leakage center detector are defined, which is directly or indirectly associated with the position coordinates (x A , y A , z A ) of gas detector A, and the position coordinates (x j , y j , z j ) of the non-directly associated gas detector B. If -z + <(z0 - z j ) < z - and then the spatial distance between the non-directly associated gas detector A and the directly or indirectly associated gas detector B is less than the corresponding indirect association distance threshold;

[0062] In some alternative embodiments, the set diffusion conditions include: leakage source strength, gas leakage diffusion time, and wind speed and direction conditions, which are determined through the following steps respectively: The leakage source strength is the maximum leakage source strength of the substance that can be accepted considering the comprehensive safety and environmental protection risks and the actual on-site situation. It is recommended to select the source strength corresponding to moderate leakage of the leaked substance; The gas leakage diffusion time = overall response time - gas detector monitoring period - maximum communication and alarm delay time. The overall response time is the longest time interval acceptable from the occurrence of leakage to the issuance of a warning message; The wind speed and direction conditions are the wind speed and direction at the location of the leakage center detector; Preferably, the wind speed and direction conditions at the location of the leakage center detector can be set as the annual dominant wind speed and direction in this area, or set to 1 m / s (due to the influence of production equipment in the device blocking factors, the wind speed in the device is generally low, with an average of about 1 m / s), which is convenient for simplified calculation.

[0063] In this embodiment, a method for determining the gas leakage degree in a petrochemical enterprise production device is also provided. Figure 3 Schematically shows a schematic diagram of the steps of the method for determining the gas leakage degree in a petrochemical enterprise production device according to an embodiment of the present invention. As Figure 3 shown, the leakage degree is calculated and determined separately for each leakage area, and the corresponding leakage degree is determined according to several leakage-related parameters. Among them, the leakage-related parameters include concentration amplitude, duration, influence range, and hazard degree; among them, the influence range is the volume of the current leakage area, and the current leakage area is determined according to the aforementioned leakage area determination method.

[0064] In some alternative embodiments, the leakage-related parameters further include the leakage duration; the leakage duration is the current leakage time minus the start time of the leakage, and the start time of the leakage is obtained through the following steps: If the maximum concentration monitoring data of all leakage detection detectors in the leakage area at any moment are all less than the leakage threshold, then that moment is a non-leakage state; the start time of the leakage is the time corresponding to the last non-leakage state closest to the current leakage time. Specifically, obtain the historical concentration monitoring data of each leakage detection detector in the leakage area corresponding to this leakage event in the recent period, and establish the historical moving maximum monitoring data of each leakage detection detector in the recent period; the moving maximum monitoring data at any moment is the maximum value of the concentration monitoring data at that moment and within the previous N minutes before that moment; if the moving maximum monitoring data of all leakage detection detectors in the leakage area at any moment are all less than the leakage threshold, then that moment is a non-leakage state; the start time of the leakage is the time of the last non-leakage state closest to the current time; the leakage threshold is greater than the effective sensing threshold and less than the alarm threshold set by the enterprise. Generally, the enterprise sets the alarm threshold for combustible gas to 20% LEL and the alarm threshold for hydrogen sulfide gas to 6 ppm. Therefore, it is recommended to set the leakage threshold for combustible gas to 10% LEL and the leakage threshold for hydrogen sulfide to 3 ppm. In this embodiment, due to the large volatility of the gas detector monitoring data caused by the randomness of the gas cloud diffusion, the moving maximum monitoring data calculation method is used to solve the problem of false alarm cancellation where the leakage event is occurring but the real-time concentration monitoring data of the gas detector is small and is determined to have stopped leaking.

[0065] In some alternative embodiments, the leakage-related parameters further include: the number of leakage events, which is determined according to one leakage event corresponding to each leakage area; the concentration amplitude of each leakage event, which is determined according to the maximum value of the current concentration of each leakage detection detector in the leakage area; and the hazard of the leaked material, which is determined according to the classification of the hazard degree of occupational exposure to toxic substances, for example, it is divided into four levels: mild, moderate, high, and extremely hazardous.

[0066] It can be seen from the above embodiments that the technical solutions in the present invention can improve the determination efficiency and accuracy of the leakage area and the leakage degree.

[0067] Embodiment 2:

[0068] There are 50 gas detectors in a production facility, among which 19 are hydrogen sulfide gas detectors. When one hydrogen sulfide gas detector alarms, taking hydrogen sulfide as the monitoring object, assuming the effective sensing threshold of this hydrogen sulfide gas detector for hydrogen sulfide is 1 ppm, through statistical analysis, 11 out of the 19 detectors exceed the effective sensing threshold, that is, a leakage sensing detector set containing these 11 detectors is established. Figure 4 Schematically shows the distribution schematic diagram of the leakage sensing detector set according to Embodiment 2 of the present invention. The distribution of the 11 detectors is as shown in the figure. Through comparison and judgment, the current value of the No. 1 hydrogen sulfide gas detector among the 11 detectors is the largest, which is the leakage center detector. First, calculate the spatial distances between the leakage center detector and the other 10 gas detectors. After comparison, the spatial distances between No. 2, No. 3, No. 4, No. 5, No. 6 and No. 1 are less than the direct correlation distance threshold, which are the direct correlation gas detectors of the No. 1 detector; secondly, calculate the spatial distances between No. 2, No. 3, No. 4, No. 5, No. 6 and the other five non-direct correlation gas detectors respectively. After comparison, only the spatial distance between No. 7 detector and No. 6 is less than the indirect correlation distance threshold, that is, No. 7 and No. 6 are indirectly correlated. At this time, No. 7 is the indirect correlation gas detector of No. 1. Then further analyze whether there is an indirect correlation relationship between No. 7 and the other four (non-correlation gas detectors). After comparison, the spatial distances are all greater than the indirect correlation distance threshold; at this time, the first leakage correlation detector set is recognized, including detectors No. 1-7.

[0069] Remove the gas detectors in the leakage correlation detector set from the current leakage sensing detector set to form a new leakage sensing detector set, that is, including four detectors No. 8-11. For the new leakage sensing detector set, through comparison and judgment, the current value of the No. 10 hydrogen sulfide gas detector is the largest, which is the leakage center detector. Similarly, the correlation gas detectors are determined to be detectors No. 8 and No. 9; at this time, the second leakage correlation detector set is recognized, including detectors No. 8, No. 9, and No. 10.

[0070] Figure 5 Schematically shows the distribution schematic diagram of the leakage correlation detector set according to Embodiment 2 of the present invention. As Figure 5 shown, remove the gas detectors in the leakage correlation detector set from the current leakage sensing detector set to form a new leakage sensing detector set, that is, including one detector No. 11; at this time, the third leakage correlation detector set is recognized, only including detector No. 11, and the recognition ends here. That is, the leakage sensing detector set of 11 detectors is recognized as 3 leakage correlation detector sets, as shown in the figure.

[0071] Embodiment 3

[0072] Figure 6Schematically shows the distribution schematic diagram of the leakage correlation detector set in Embodiment 3 of the present invention. As Figure 6 shown, the leakage correlation detector set of a certain hydrogen sulfide leakage incident includes 7 gas detectors numbered 1-7, and the spatial positions are as shown in the figure. Among them, the No. 12 gas detector is a hydrogen sulfide gas detector and is a non-leakage sensing detector that did not sense this leakage. Assume that the current time is 12:00 on October 1, 2022, and the leakage start time is 11:00 on October 1, 2022. The maximum concentration value of the current values of the 7 gas detectors is 8 ppm. Then for this leakage area: the leakage amplitude is the maximum concentration value of the current values of the 7 gas detectors, that is, 8 ppm; the leakage duration is the current time minus the leakage start time of this leakage incident, that is, 1 hour; according to the classification of the degree of harm of occupational exposure to toxic substances, the substance harm degree of hydrogen sulfide is extremely harmful.

[0073] Among them, the influence range is the volume of the leakage area. According to the positions of the gas detectors in each leakage correlation detector set, three-dimensional polyhedral solid spaces are respectively constructed in accordance with the principle of maximizing the spatial volume to obtain each leakage area, and the constructed solid space should not contain non-leakage sensing detectors. Figure 7 Schematically shows the construction schematic diagram of the three-dimensional space in Embodiment 3 of the present invention. As Figure 7 shown, a three-dimensional polyhedral solid space construction plan 1 is formed in accordance with the principle of maximizing the spatial volume as shown in the figure. However, since this space includes the No. 12 detector, it is not adopted. The effective three-dimensional polyhedral solid space is as shown in plan 2; calculating the volume of the solid space of plan 2 is the volume of this leakage area.

[0074] Embodiment 4

[0075] This embodiment provides a method for calculating the leakage start time of a leakage incident. The leakage correlation detector set of a certain hydrogen sulfide leakage incident includes 7 gas detectors numbered 1-7, and the current time is 12:00 on October 1, 2022. Obtain the historical concentration monitoring data of the 7 leakage sensing detectors in the past 7 hours, and establish the historical moving maximum monitoring data of each leakage sensing detector in the recent period; the moving maximum monitoring data at any moment is the maximum value of the concentration monitoring data at that moment and within 3 minutes before that moment. The concentration monitoring data of the No. 1 gas detector is shown in the following table, and its moving maximum monitoring data is calculated accordingly.

[0076] Table 1 Example of moving maximum monitoring data

[0077]

[0078] For example, the moving maximum monitoring data at 5:03 is the maximum value of the concentration monitoring data from 5:00 to 5:03, and the moving maximum monitoring data at 5:02 can be the maximum value of the concentration monitoring data from 5:00 to 5:02. If the moving maximum monitoring data of all leakage sensing detectors in the leakage area at any moment are all less than the leakage threshold, then this moment is in a non-leakage state; the leakage threshold of hydrogen sulfide gas is set to 2 ppm. Assuming that there are 258 non-leakage moments between 5:00 and 12:00, which are 5:00, 5:01, 5:02, 5:25, 5:26, 5:27,..., 10:22, 10:46 respectively. Among the above non-leakage states, the one closest to the current time (12:00) is 10:46, so the leakage start time is 10:46. If there is no non-leakage moment within the past 7 hours, then the historical concentration monitoring data of the past 8 hours and 9 hours are further taken for processing.

[0079] Example 5

[0080] There are 50 gas detectors in a production device, including 19 hydrogen sulfide gas detectors, 20 combustible gas detectors, and 11 oxygen detectors. When hydrogen sulfide is the monitoring object, only the spatial positions and concentration monitoring data of the 19 hydrogen sulfide gas detectors are used; when combustible gas is the monitoring object, only the spatial positions and concentration monitoring data of 21 combustible gas detectors are used. In addition, since oxygen detectors are used to monitor the oxygen content in the environment and have no direct relationship with gas leakage, and there are generally no major potential hazards of oxygen leakage in the petrochemical enterprise environment, generally oxygen detectors are not applicable to the evaluation of the leakage area and leakage degree of the present invention.

[0081] The setting of the source strength of moderate leakage:

[0082] Table 2 Moderate leakage

[0083]

[0084]

[0085] Table 3 Hazard zoning table of toxic gas hazards

[0086] Hazard Zoning Inhalation Toxicity A LC50 ≤ 200 μmol / mol B 200 μmol / mol < LC50 ≤ 1000 μmol / mol C 1000 μmol / mol < LC50 ≤ 3000 μmol / mol D 3000 μmol / mol < LC50 ≤ 5000 μmol / mol

[0087] Example 6

[0088] Based on the same inventive concept, the present invention also provides a device for determining the gas leakage area in a petrochemical enterprise production device. Figure 8 Schematically shows the structural schematic diagram of the device for determining the gas leakage area in a petrochemical enterprise production device according to an embodiment of the present invention. As Figure 8As shown, the device includes: a first set determination module, configured to use a gas detector whose maximum detected concentration within the current time period exceeds the effective sensing threshold as a leakage sensing detector, and obtain a leakage sensing detector set; a second set determination module, configured to identify a leakage associated detector set according to the distance relationship with the leakage sensing detectors in the leakage sensing detector set; and a leakage area construction module, configured to construct a three-dimensional space based on the positions of the gas detectors in the leakage associated detector set, and obtain a leakage area from the three-dimensional space.

[0089] In some alternative embodiments, the effective sensing threshold is determined according to the maximum value among the following values: a preset multiple of the detection limit of the monitoring factor corresponding to the gas detector; the maximum concentration of the substance corresponding to the gas detector in the ambient air of the device location; the effective sensing threshold of the gas detector set according to the preset specification.

[0090] In some alternative embodiments, the distance relationship includes: being less than a direct correlation distance threshold from the leakage sensing detector; being less than an indirect correlation distance threshold from a gas detector satisfying the foregoing distance condition; and being less than an indirect correlation distance threshold from an indirectly associated gas detector.

[0091] In some alternative embodiments, identifying a leakage-associated detector set according to the distance relationship with the leakage-sensing detectors in the leakage-sensing detector set includes: taking the gas detector with the largest current value in the leakage-sensing detector set as the leakage center detector; if the spatial distance between any leakage-sensing detector in the set and the leakage center detector is less than the corresponding direct association distance threshold, then the leakage-sensing detector is a direct-associated gas detector of the leakage center detector, otherwise it is a non-direct-associated gas detector; if the spatial distance between any non-direct-associated gas detector and a direct-associated gas detector is less than the corresponding indirect association distance threshold, then the non-direct-associated gas detector is an indirect-associated gas detector of the leakage center detector; if the spatial distance between any non-direct-associated gas detector and an indirect-associated gas detector is less than the corresponding indirect association distance threshold, then the non-direct-associated gas detector is also an indirect-associated gas detector of the leakage center detector; obtaining a leakage-associated detector set including the leakage center detector and all its associated gas detectors; where the associated gas detectors include direct-associated gas detectors and indirect-associated gas detectors; obtaining the result of removing the leakage-associated detector set from the leakage-sensing detector set, replacing the leakage-sensing detector set with the result, and identifying the leakage center detector and its leakage-associated detector set again, and performing multiple identifications until the result is an empty set to end the identification; each leakage-associated detector set identified during the process is an independent leakage area, there is no intersection between the leakage-associated detector sets, and the union of all the leakage-associated detector sets is equal to the initial leakage-sensing detector set.

[0092] In some alternative embodiments, the direct association distance threshold is determined through the following steps: taking the substance type of the monitoring object as the leakage substance, conducting a three-dimensional spatial gas leakage diffusion experiment or simulation under set diffusion conditions, and obtaining the spatial concentration distribution result of the leakage substance; according to the spatial concentration distribution result, drawing an isoconcentration surface with the effective sensing threshold of the gas detector as the set value; the direct association distance threshold includes three parts: distance L, distance Z+, and distance Z-; taking the average value of the distance between the isoconcentration surface and the leakage source as the direct association distance L, taking the absolute value of the vertical distance between the highest point of the isoconcentration surface and the leakage source as the direct association distance Z+, and taking the absolute value of the vertical distance between the lowest point of the isoconcentration surface and the leakage source as the direct association distance Z-.

[0093] In some alternative embodiments, when it is determined that the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct association distance threshold, the following steps are taken: defining the position coordinates (x0, y0, z0) of the leakage center detector, and the position coordinates (x o , y o , zo ), if -z + <(z0 - z i ) < z - and then the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct correlation distance threshold.

[0094] In some alternative embodiments, the indirect correlation distance threshold is determined by the following steps: taking the material type of the monitored object as the leakage substance, conducting a three - dimensional gas leakage diffusion experiment or simulation under set diffusion conditions to obtain the spatial concentration distribution result of the leakage substance; according to the spatial concentration distribution result, taking the current concentration values of two gas detectors as set values respectively, drawing the first equal - concentration surface and the second equal - concentration surface; drawing multiple straight lines from the leakage source position, intersecting with the first equal - concentration surface and the second equal - concentration surface, and obtaining the average value of the lengths of multiple line segments between the two surfaces as the indirect correlation distance threshold JL between the two gas detectors.

[0095] In some alternative embodiments, when the spatial distance between the non - directly - related gas detector and the directly - related gas detector or the indirectly - related gas detector is less than the corresponding indirect correlation distance threshold, it is determined according to the following steps: according to the current concentration value of the non - directly - related gas detector and the current concentration value of the directly - related gas detector or the indirectly - related gas detector, determining the indirect correlation distance threshold JL between them; defining the position coordinates (x0, y0, z0) of the leakage center detector, the position coordinates (x A , y A , z A ) of the directly - related gas detector or the indirectly - related gas detector, and the position coordinates (x j , y j , z j ) of the non - directly - related gas detector, if -z + <(z0 - z j ) < z - and then the spatial distance between the non - directly - related gas detector and the directly - related gas detector or the indirectly - related gas detector is less than the corresponding indirect correlation distance threshold.

[0096] In some alternative embodiments, the set diffusion conditions include: leakage source strength, gas leakage diffusion time, and wind speed and direction conditions.

[0097] In some alternative embodiments, the gas leakage diffusion time is determined by the following steps: gas leakage diffusion time = overall response time - gas detector monitoring period - maximum communication and alarm delay time; the overall response time is the maximum acceptable time interval from the occurrence of leakage to the issuance of a warning message.

[0098] For the specific limitations of each functional module in the above-mentioned gas leakage area determination device in the petrochemical enterprise production device, reference can be made to the limitations of the gas leakage area determination method in the petrochemical enterprise production device in the foregoing text, which will not be elaborated here. Each module in the above device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or be stored in the memory of the computer device in software form, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.

[0099] At the same time, a device for determining the degree of gas leakage in a petrochemical enterprise production device is also provided. The device includes: an influence range calculation module for determining the leakage influence range; the leakage influence range is the volume of the current leakage area, and the current leakage area is determined according to the foregoing leakage area determination method; and a leakage degree calculation module for determining the corresponding leakage degree according to a number of leakage-related parameters including the leakage influence range; the leakage degree is calculated and determined separately for each leakage area.

[0100] In some alternative embodiments, the leakage-related parameters further include the leakage duration; the leakage duration is the leakage current time minus the leakage start time, and the leakage start time is obtained through the following steps: if the maximum concentration monitoring data of all leakage detection detectors in the leakage area at any moment are all less than the leakage threshold, then that moment is a non-leakage state; the time corresponding to the last non-leakage state closest to the leakage current time is used as the leakage start time.

[0101] In some alternative embodiments, the leakage-related parameters further include: the number of leakage events, which is determined according to one leakage event corresponding to each leakage area; the concentration amplitude of each leakage event, which is determined according to the maximum value of the current concentration of each leakage detection detector in the leakage area; and the leakage material hazard, which is determined according to the classification of the hazard degree of occupational exposure to toxic substances.

[0102] For the specific limitations of each functional module in the above-mentioned device for determining the degree of gas leakage in a petrochemical enterprise production device, reference can be made to the limitations of the method for determining the degree of gas leakage in a petrochemical enterprise production device in the foregoing text, which will not be elaborated here. Each module in the above device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or be stored in the memory of the computer device in software form, so as to facilitate the processor to call and execute the operations corresponding to each of the above modules.

[0103] Embodiment 7

[0104] This embodiment provides a non-transitory (non-volatile) computer storage medium storing computer-executable instructions that can execute the methods in any of the above method embodiments and achieve the same technical effects.

[0105] This embodiment also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to execute the methods described in the above aspects and achieve the same technical effects.

[0106] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program code.

[0107] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks.

[0108] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the functions specified in Figure 1 one or more of the flows Figure 1 or blocks.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide for implementing the functions specified in Figure 1One or more processes and / or blocks Figure 1 Steps of the functions specified in one or more blocks

[0110] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0111] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.

[0112] Computer-readable media includes permanent and non-permanent, removable and non-removable media and can store information by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can store information accessible by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0113] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0114] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A method for determining the gas leakage area in a production device of a petrochemical enterprise, characterized in that, The method includes: Taking the gas detectors whose maximum detected concentration in the current time period exceeds the effective sensing threshold as leakage sensing detectors, and obtaining a set of leakage sensing detectors; Identifying a set of leakage associated detectors according to the distance relationship with the leakage sensing detectors in the set of leakage sensing detectors; Constructing a three-dimensional space based on the positions of the gas detectors in the set of leakage associated detectors, and obtaining a leakage area from the three-dimensional space.

2. The method according to claim 1, wherein The effective sensing threshold is determined according to the maximum value among the following values: A preset multiple of the detection limit of the monitoring factor corresponding to the gas detector; The maximum concentration of the substance corresponding to the gas detector in the ambient air of the device location; The effective sensing threshold of the gas detector set according to the preset specification.

3. The method according to claim 1, wherein Identifying a set of leakage associated detectors according to the distance relationship with the leakage sensing detectors in the set of leakage sensing detectors, including: Taking the gas detector with the largest current value in the set of leakage sensing detectors as the leakage center detector; If the spatial distance between any leakage sensing detector in the set and the leakage center detector is less than the corresponding direct correlation distance threshold, then the leakage sensing detector is a direct associated gas detector of the leakage center detector, otherwise it is a non-direct associated gas detector; If the spatial distance between any non-direct associated gas detector and a direct associated gas detector is less than the corresponding indirect correlation distance threshold, then the non-direct associated gas detector is an indirect associated gas detector of the leakage center detector; If the spatial distance between any non-direct associated gas detector and an indirect associated gas detector is less than the corresponding indirect correlation distance threshold, then the non-direct associated gas detector is also an indirect associated gas detector of the leakage center detector; Obtaining a set of leakage associated detectors including the leakage center detector and all its associated gas detectors; where the associated gas detectors include direct associated gas detectors and indirect associated gas detectors; Obtaining the result of removing the set of leakage associated detectors from the set of leakage sensing detectors, replacing the set of leakage sensing detectors with the result, and identifying the leakage center detector and its set of leakage associated detectors again, and performing multiple identifications until the result is an empty set, then ending the identification; Each set of leakage associated detectors identified during the process is an independent leakage area, there is no intersection between the sets of leakage associated detectors, and the union of all sets of leakage associated detectors is equal to the initial set of leakage sensing detectors.

4. The method according to claim 3, wherein The direct correlation distance threshold is determined through the following steps: Taking the substance type of the monitoring object as the leakage substance, conducting a three-dimensional gas leakage diffusion experiment or simulation under the set diffusion conditions, and obtaining the spatial concentration distribution result of the leakage substance; According to the spatial concentration distribution result, drawing an isoconcentration surface with the effective sensing threshold of the gas detector as the set value; The direct correlation distance threshold includes three parts: distance L, distance Z+, and distance Z-; the average value of the distance between the isoconcentration surface and the leakage source is used as the direct correlation distance L, the absolute value of the vertical distance between the highest point of the isoconcentration surface and the leakage source is used as the direct correlation distance Z+, and the absolute value of the vertical distance between the lowest point of the isoconcentration surface and the leakage source is used as the direct correlation distance Z-.

5. The method according to claim 4, characterized in that, When the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct correlation distance threshold, it is determined according to the following steps: Define the position coordinates (x0, y0, z0) of the leakage center detector, and the position coordinates (x i , y i , z i ) of the leakage sensing detectors in the set. If -z + < (z0 - z i ) < z - and then the spatial distance between the gas detector and the leakage center detector is less than the corresponding direct correlation distance threshold.

6. The method according to claim 3, characterized in that, The indirect correlation distance threshold is determined through the following steps: Taking the substance type of the monitoring object as the leakage substance, conducting a three-dimensional gas leakage diffusion experiment or simulation under set diffusion conditions to obtain the spatial concentration distribution result of the leakage substance; According to the spatial concentration distribution result, taking the current concentration values of the two gas detectors as set values respectively, and drawing the first isoconcentration surface and the second isoconcentration surface; Drawing multiple straight lines from the leakage source position, intersecting with the first isoconcentration surface and the second isoconcentration surface, and obtaining the average value of the lengths of multiple line segments between the two surfaces as the indirect correlation distance threshold JL between the two gas detectors.

7. The method according to claim 6, characterized in that, When the spatial distance between the non-directly associated gas detector and the directly associated gas detector or the indirectly associated gas detector is less than the corresponding indirect correlation distance threshold, it is determined according to the following steps: According to the current concentration value of the non-directly associated gas detector and the current concentration value of the directly associated gas detector or the indirectly associated gas detector, determining the indirect correlation distance threshold JL between the two; Define the position coordinates (x0, y0, z0) of the leakage center detector, and the position coordinates (x A , y A , z A ) of the directly associated gas detector or indirectly associated gas detector, and the position coordinates (x j , y j , z j ) of the non-directly associated gas detector. If -z + < (z0 - z j ) < z - and then the spatial distance between the non-directly associated gas detector and the directly associated gas detector or indirectly associated gas detector is less than the corresponding indirect association distance threshold.

8. The method according to claim 4 or 6, characterized in that, The set diffusion conditions include: leakage source strength, gas leakage diffusion time, and wind speed and direction conditions.

9. The method according to claim 8, wherein The gas leakage diffusion time is determined through the following steps: Gas leakage diffusion time = overall response time - gas detector monitoring period - maximum communication alarm delay time; The overall response time is the longest acceptable time interval from the occurrence of leakage to the issuance of a warning message.

10. A method for determining the gas leakage degree in a production device of a petrochemical enterprise, characterized in that, The method includes: determining the leakage impact range; the leakage impact range is the volume of the current leakage area, and the current leakage area is determined according to the leakage area determination method described in any one of claims 1 to 9; Determining the corresponding leakage degree according to several leakage-related parameters including the leakage impact range; Calculating and determining the leakage degree for each leakage area separately.

11. The method according to claim 10, wherein The leakage-related parameters further include the leakage duration; the leakage duration is the leakage current time minus the leakage start time, and the leakage start time is obtained through the following steps: If the maximum concentration monitoring data of all leakage sensing detectors in the leakage area at any moment are all less than the leakage threshold, then that moment is a non-leakage state; Taking the time corresponding to the last non-leakage state closest to the leakage current time as the leakage start time.

12. The method according to claim 10, wherein The leakage-related parameters further include: The number of leakage events, which is determined according to one leakage event corresponding to each leakage area; The concentration amplitude of each leakage event, which is determined according to the maximum value of the current concentration values of the leakage sensing detectors in the leakage area; and Hazards of leaked materials, which are determined according to the classification of hazards of occupational exposure to toxic substances.

13. A device for determining a gas leakage area in a production device of a petrochemical enterprise, characterized in that, The device includes: A first set determination module, configured to use gas detectors whose maximum concentration detected within the current time period exceeds the effective sensing threshold as leakage sensing detectors, and obtain a leakage sensing detector set; A second set determination module, configured to identify a leakage associated detector set according to the distance relationship with the leakage sensing detectors in the leakage sensing detector set; and A leakage area construction module, configured to construct a three-dimensional space based on the locations of the gas detectors in the leakage associated detector set, and obtain a leakage area from the three-dimensional space.

14. A device for determining the degree of gas leakage in a production device of a petrochemical enterprise, characterized in that, The device includes: An influence range calculation module, configured to determine the leakage influence range; the leakage influence range is the volume of the current leakage area, and the current leakage area is determined according to the leakage area determination method described in any one of claims 1 to 9; and A leakage degree calculation module, configured to determine the corresponding leakage degree according to several leakage related parameters including the leakage influence range; the leakage degree is calculated and determined separately for each leakage area.

15. An electronic device, characterized in that, Includes: At least one processor; And a memory communicatively connected to the at least one processor; Wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor executes the method described in any one of claims 1 to 12.

16. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause the computer to execute the method described in any one of claims 1 to 12.

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