CN116412359A - Natural gas leakage monitoring system and method - Google Patents
Natural gas leakage monitoring system and method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a natural gas leakage monitoring system and method, and relates to the technical field of leakage detection. The system comprises a pipeline dividing module for dividing natural gas pipelines, a pipeline monitoring module for real-time monitoring and detection, a leakage positioning module for determining leakage positions, an alarm prompt module for giving out leakage alarms, a leakage processing module for processing the leakage pipelines, a control center module for collecting analysis and storing data, a danger assessment module for constructing a danger assessment model and a leakage early warning module for avoiding leakage risks in advance. According to the invention, through a plurality of detection methods, a plurality of combination modes, accurate positioning and timely reminding, the omnibearing detection of the natural gas pipeline is realized, and the accuracy and timeliness of leakage detection are improved; early warning before leakage is realized by analyzing data, and risk degree evaluation after leakage is realized by constructing a risk evaluation model, so that large-scale natural gas leakage is further avoided, and personnel safety is guaranteed to the greatest extent.
Description
Technical Field
The invention belongs to the technical field of leakage monitoring, and particularly relates to a natural gas leakage monitoring system and method.
Background
Natural gas is an important energy source and is widely used as city gas and industrial fuel, and the demand of natural gas is increasing with the development of economy. Because natural gas can suffocate people after the content in the air reaches a certain degree, and as fuel, natural gas can also cause casualties because of explosion, when natural gas reaches a certain proportion under the condition of gathering in closed environments such as houses or tents, huge explosion can be triggered. Thus, some measures are required to prevent the safety problem caused by the leakage of the natural gas.
At present, natural gas is transported by mainly adopting a pipeline transportation mode, when the natural gas is transported, the pipeline is affected by transportation time, transportation environment, service conditions and the like, the pipeline can be inevitably corroded, the pipeline is not sealed again due to abrasion at an interface or is finally damaged due to unexpected damage of artificial factors such as construction and the like, and therefore the pipeline is required to be monitored, if the leakage of the natural gas is detected, the leakage position is required to be positioned in time, and related personnel are warned to timely handle the leakage position through warning, so that huge loss or casualties caused by the leakage of the natural gas are avoided. The traditional detection method is carried out by a hardware detection method, and the detection method has the problems of poor generalization capability, low positioning precision and the like.
Chinese invention CN113418142a discloses a natural gas leakage monitoring system and method, the system comprising: the natural gas valve is used for acquiring the natural gas valve state and sending the natural gas valve state to the cloud server; the cooking bench valve is used for acquiring the state of the cooking bench valve and sending the state of the cooking bench valve to the cloud server; the cloud server is used for receiving the natural gas valve state and the cooking bench valve state, determining the current state of the pipeline to be monitored according to the natural gas valve state and the cooking bench valve state, and sending pressure acquisition instructions to the plurality of pressure monitoring sensors when the current state is in a closed state; the pressure monitoring sensors are used for acquiring the air pressure value of the pipeline when receiving the pressure acquisition instruction and sending the air pressure value of the pipeline to the cloud server; the cloud server is further used for judging whether natural gas leakage exists in the pipeline to be monitored according to the pipeline air pressure value. Thereby realizing the leak detection of the pipeline. Through the mode, when the natural gas valve and the cooking bench valve are closed simultaneously, the air pressure decreasing rate in the pipeline is detected, so that whether the natural gas leakage exists in the pipeline is judged, whether the natural gas leakage exists in the pipeline can be automatically detected without manual detection, and the safety of a user is improved.
The leakage monitoring of the natural gas mainly aims at a natural gas pipeline entering a user's home, and the pipeline generally adopts a metal hose and the like to carry out natural gas transportation; said invention does not aim at monitoring the pipeline for conveying natural gas to city by natural gas company or natural gas factory, and said pipeline adopts PE pipe or steel pipe for conveying, because the same monitoring method is not necessarily applicable to different pipeline materials, and said invention does not aim at different pipeline materials to adopt correspondent leakage monitoring method.
In the prior art, different leakage monitoring technologies adopted according to different pipeline materials adopted in different conveying stages are lacked, only the leaked natural gas is treated, and early warning is not carried out on the natural gas before leakage; no risk assessment is made for the leakage situation of natural gas, nor is there any distinction made between slow leakage (insensitive leakage) or sudden leakage or artificially induced leakage, and different countermeasures are made for the above leakage modes.
Disclosure of Invention
The invention aims to provide a natural gas leakage monitoring system and a natural gas leakage monitoring method, which adopt different monitoring modes by judging pipeline materials at different stages; timely finding out the leakage position through the positioning mark, reminding after leakage by utilizing an alarm, and timely processing for slow leakage or sudden leakage; early warning is carried out on the natural gas before leakage occurs by analyzing the information data, so that the leakage caused by people is prevented; by analyzing the detection data, the risk degree assessment of the natural gas leakage is made, and the full-scale, large-scale and staged post-leakage monitoring and pre-leakage early warning from a natural gas factory or a natural gas company to an urban gas distribution center to the home of a user are realized.
The aim of the invention can be achieved by the following technical scheme:
in a first aspect, an embodiment of the present application provides a natural gas leakage monitoring system, including a pipeline dividing module, a pipeline monitoring module, a leakage positioning module, an alarm prompting module, a leakage processing module and a control center module that are sequentially connected in a communication manner;
the pipeline dividing module is used for dividing the natural gas pipeline into a first pipeline, a second pipeline, a third pipeline and a fourth pipeline according to the material, the application and the laying area of the natural gas pipeline;
the pipeline monitoring module is used for processing a plurality of pipeline interfaces of the natural gas pipeline and segmenting the natural gas pipeline to form segmented pipelines; the pipeline interface and the segmented pipeline are monitored and detected in real time, and a leakage pipeline with natural gas leakage is marked to generate a marking signal and a positioning signal;
the leakage positioning module is used for determining the position of the leakage pipeline according to the positioning signal and generating an alarm signal;
the alarm prompting module comprises an alarm unit and a prompting unit; the alarm unit is used for sending out leakage alarm according to the alarm signal; the prompting unit is used for generating prompting information; wherein, the prompt message includes: leakage position, leakage start time, leakage amount, diffusion speed, and environmental information;
The control center module is used for generating a processing instruction according to the alarm signal and the prompt information;
the leakage processing module is used for processing the leakage pipeline according to the processing instruction and generating a processing result report;
the control center module is also used for collecting data of each module and analyzing the data of each module to generate an analysis result report; the system is also used for storing the data of each module; and is also used for generating detection instructions.
Preferably, the pipeline monitoring module comprises a pipeline interface unit, a pipeline segmentation unit, a pipeline monitoring unit and a pipeline detection unit which are sequentially in communication connection;
the pipeline interface unit is used for acquiring the pipeline interfaces and related information thereof, and sealing each two pipeline interfaces to form a sealing interface; wherein the related information includes: interface type, interface shape, interface size, interface model and interface material;
the pipeline segmentation unit is used for segmenting the natural gas pipeline according to the pipeline interface to form a segmented pipeline;
the pipeline monitoring unit is used for monitoring the segmented pipeline and the sealing interface and sending monitoring information to the control center module;
The pipeline detection unit is used for detecting the segmented pipeline and the sealing interface according to the detection instruction, marking the leakage pipeline and generating the marking signal and the positioning signal.
Preferably, the detection instruction comprises a detection mode and a detection method; wherein the detection mode comprises alternate detection and combined detection.
Preferably, the detection method includes: an interval pressure detection method, a magnetic leakage detection method, a thermal infrared imager detection method, a negative pressure wave detection method and an array eddy current detection method.
Preferably, the first pipeline adopts the negative pressure wave detection method and the interval pressure detection method to perform the alternate detection; the second pipeline adopts the thermal infrared imager detection method and the negative pressure wave detection method to carry out the combined detection; the third pipeline adopts the negative pressure wave detection method and the interval pressure detection method to carry out the alternate detection; and the fourth pipeline adopts the magnetic leakage detection method and the array eddy current detection method to carry out the combined detection.
Preferably, the sealing interface is wrapped by an industrial sealing film, and the industrial sealing film is provided with a gas pressure sensor and a gas flowmeter.
Preferably, the control center module comprises a control instruction unit, a data collection unit, a data analysis unit and a data storage unit which are sequentially in communication connection;
the control instruction unit is configured to generate a control instruction, where the control instruction includes: the processing instruction, the detecting instruction and the collecting instruction;
the data collection unit is used for collecting the data of each module according to the collection instruction and classifying and sorting the data;
the data analysis unit is used for analyzing and summarizing the collected data of each module and generating an analysis result report;
the data storage unit is used for storing the data of each module;
the data storage unit is also used for providing retrieval rights and access rights for the modules.
Preferably, the system further comprises a risk assessment module in communication with the control center module for constructing a risk assessment model based on the monitoring information, the prompt information, the processing result report, and the analysis result report; the risk assessment model is used for carrying out real-time risk degree assessment on natural gas in a dynamically changing leakage area.
Preferably, the system further comprises a leakage early warning module which is in communication connection with the risk assessment module and is used for early warning the natural gas pipeline before leakage and avoiding the leakage risk of the natural gas pipeline in advance; the leakage early warning module comprises an engineering information acquisition unit, an information analysis comparison unit and a safety early warning unit which are sequentially connected in a communication mode;
the engineering information acquisition unit is used for acquiring engineering construction information, pipeline laying information and the marking signal;
the information analysis and comparison unit is used for analyzing the engineering construction information, comparing the analysis result with the pipeline laying information and generating an early warning signal by combining the marking signal;
the safety early warning unit is used for sending an early warning notice according to the early warning signal;
wherein the engineering construction information includes: construction area, construction range and construction start time; the pipe laying information includes: the material, the paving area, the paving range, the paving start time and the paving end time;
wherein the marking signal is used to mark the leak conduit.
In a second aspect, embodiments of the present application provide a method for monitoring leakage of natural gas, including the steps of:
S1, dividing a natural gas pipeline into a first pipeline, a second pipeline, a third pipeline and a fourth pipeline according to the material, the application and the laying area of the natural gas pipeline;
s2, treating a plurality of interfaces of the natural gas pipeline and segmenting the natural gas pipeline;
s3, monitoring the interface and the segmented pipeline in real time to generate monitoring information;
s4, generating a detection instruction according to the monitoring information;
s5, detecting the segmented pipeline and the interface according to the detection instruction, marking the leakage pipeline and generating a marking signal and a positioning signal;
s6, determining the position of the leakage pipeline according to the positioning signal, and generating an alarm signal;
s7, sending out leakage alarm according to the alarm signal and generating prompt information;
s8, generating a processing instruction according to the alarm signal and the prompt information;
s9, processing the leakage pipeline according to the processing instruction and generating a processing result report;
s10, generating a collection instruction, collecting data of each module of the system according to the collection instruction, and classifying and sorting;
s11, analyzing and summarizing the collected data of each module of the system to generate an analysis result report;
S12, storing data of each module of the system and providing retrieval rights and access rights for each module of the system;
s13, constructing a risk assessment model according to the monitoring information, the prompt information, the processing result report and the analysis result report;
s14, carrying out real-time risk degree assessment on the dynamic change of the natural gas in the leakage area according to the risk assessment model;
s15, acquiring engineering construction information, pipeline laying information and the marking signals;
s16, analyzing the engineering construction information, comparing an analysis result with the pipeline laying information, and generating an early warning signal by combining the marking signal;
s17, sending an early warning notice according to the early warning signal, and avoiding the leakage risk of the natural gas pipeline in advance;
the detection instruction comprises a detection mode and a detection method; the detection mode comprises alternate detection and combined detection; the detection method comprises the following steps: an interval pressure detection method, a magnetic leakage detection method, a thermal infrared imager detection method, a negative pressure wave detection method and an array eddy current detection method;
the first pipeline adopts the negative pressure wave detection method and the interval pressure detection method to carry out the alternate detection; the second pipeline adopts the thermal infrared imager detection method and the negative pressure wave detection method to carry out the combined detection; the third pipeline adopts the negative pressure wave detection method and the interval pressure detection method to carry out the alternate detection; and the fourth pipeline adopts the magnetic leakage detection method and the array eddy current detection method to carry out the combined detection.
The beneficial effects of the invention are as follows:
(1) According to different conveying pipelines used in the process that a natural gas company/natural gas factory arrives at a city gas distribution center and arrives at a user home, different leakage detection means are adopted, so that the condition that one detection means cannot be suitable for the whole conveying process is prevented, the comprehensive detection of the natural gas conveying pipeline is realized through various means, and the accuracy and timeliness of the leakage detection are further guaranteed.
(2) The position where natural gas leakage occurs is accurately positioned according to the detection result, and timely reminding is carried out through alarm prompt, so that economic loss or casualties caused by natural gas leakage but not timely treatment are prevented by utilizing the positioning accuracy and the reminding timeliness.
(3) The method for distinguishing the leakage of the natural gas adopts a mode of alternately or combining a plurality of detection means to detect slow leakage (insensitive leakage) or sudden leakage, ensures that the natural gas conveying pipeline can be timely detected when the natural gas conveying pipeline leaks in different modes, and further ensures the safety of natural gas conveying.
(4) The natural gas pipeline after leakage is timely processed through analysis and detection data, engineering construction information such as construction site information is analyzed, the analyzed information is compared with the pipeline laying position, and therefore early warning notification is carried out on the natural gas pipeline before leakage, natural gas pipeline damage caused by artificial factors such as construction is prevented, and large-scale leakage of natural gas is avoided.
(5) By collecting and analyzing detection data, a risk assessment model of natural gas leakage is established, so that the risk degree of the leaked natural gas is assessed, corresponding treatment is carried out according to the assessment result, if the risk degree is extremely high, people in a leakage area need to be evacuated rapidly, and nearby treatment personnel are dispatched rapidly for treatment; the danger assessment model can also provide a processing time (natural gas explosion limit time) for processing personnel to be used as a reference, so that the processing personnel can be prevented from danger caused by too long processing time.
Drawings
For a better understanding and implementation, the technical solutions of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a natural gas leakage monitoring system according to an embodiment of the present application;
fig. 2 is a schematic stage division diagram of a natural gas transportation process according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a pipeline monitoring module according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of a section pressure detection method according to an embodiment of the present disclosure;
FIG. 5 is a flowchart illustrating steps of a thermal infrared imager detection method according to an embodiment of the present disclosure;
FIG. 6 is a flowchart illustrating steps of a negative pressure wave detection method according to an embodiment of the present disclosure;
Fig. 7 is a schematic structural diagram of a control center module according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a leak early warning module according to an embodiment of the present disclosure;
FIG. 9 is a flow chart of steps of a method for monitoring natural gas leakage according to an embodiment of the present disclosure;
description of the reference numerals
In the figure: 1. a pipeline dividing module; 2. a pipeline monitoring module; 3. a leak location module; 4. an alarm prompting module; 5. a leakage processing module; 6. a control center module; 7. a risk assessment module; 8. a leakage early warning module; 21. a pipe interface unit; 22. a pipe segmentation unit; 23. a pipeline monitoring unit; 24. a pipeline detection unit; 41. an alarm unit; 42. a prompting unit; 61. a control instruction unit; 62. a data collection unit; 63. a data analysis unit; 64. a data storage unit; 81. an engineering information acquisition unit; 82. an information analysis and comparison unit; 83. and a safety early warning unit.
Detailed Description
For further explanation of the technical means and effects adopted by the present invention for achieving the intended purpose, exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of methods and systems that are consistent with aspects of the present application, as detailed in the accompanying claims.
The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The following detailed description of specific embodiments, features and effects according to the present invention is provided with reference to the accompanying drawings and preferred embodiments.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a natural gas leakage monitoring system, which includes a pipeline dividing module 1, a pipeline monitoring module 2, a leakage positioning module 3, an alarm prompting module 4, a leakage processing module 5, a control center module 6, a risk assessment module 7 and a leakage early warning module 8, which are sequentially connected in a communication manner;
the pipeline dividing module 1 is used for dividing the natural gas pipeline into a first pipeline, a second pipeline, a third pipeline and a fourth pipeline according to the material and the laying area of the natural gas pipeline;
the pipeline monitoring module 2 is used for processing a plurality of pipeline interfaces of the natural gas pipeline and segmenting the natural gas pipeline to form segmented pipelines; the method comprises the steps of monitoring and detecting pipeline interfaces and segmented pipelines in real time, marking leakage pipelines with natural gas leakage, and generating marking signals and positioning signals;
A leak location module 3 for determining the location of the leak pipe from the location signal and generating an alarm signal;
an alarm prompt module 4 including an alarm unit 41 and a prompt unit 42; the alarm unit 41 is used for giving out a leakage alarm according to an alarm signal; the prompt unit 42 is used for generating prompt information; wherein, the prompt message includes: leakage position, leakage start time, leakage amount, diffusion speed, and environmental information;
the control center module 6 is used for generating a processing instruction according to the alarm signal and the prompt information;
the leakage processing module 5 is used for processing the leakage pipeline according to the processing instruction and generating a processing result report;
the control center module 6 is also used for collecting data of each module and analyzing the data of each module to generate an analysis result report; the system is also used for storing data of each module; the method is also used for generating a detection instruction;
the risk assessment module 7 is used for constructing a risk assessment model and carrying out real-time risk degree assessment on the natural gas in the dynamically-changed leakage area;
and the leakage early warning module 8 is used for early warning the natural gas pipeline before leakage and avoiding the leakage risk of the natural gas pipeline in advance.
The modules of the above system will be described in detail.
With respect to the pipeline dividing module 1, after the lng is purchased by a natural gas company (or natural gas plant), the lng is transported to the natural gas company by a special vehicle. The natural gas needs to convert liquefied natural gas into gasified natural gas, so that pressure regulation is needed, and the gasified natural gas formed after pressure regulation is colorless and odorless, so that the gasified natural gas cannot be found after natural gas leakage is avoided, and tetrahydrothiophene is usually added to the gasified natural gas to carry out odorizing treatment. Note that, in this embodiment, the natural gas refers to a natural gas that is in a gaseous state and can be used by a user. The natural gas after the treatment is conveyed to urban areas or towns by natural gas companies through conveying pipelines, the towns convey the natural gas after the treatment to all areas, and the natural gas is conveyed to each user in all areas.
In the whole natural gas conveying process, conveying pipelines between various conveying stations can adopt different materials according to actual requirements due to various factors such as regional reasons, demand reasons, safety considerations and the like. Referring to fig. 2, natural gas is delivered from a delivery main station located in a natural gas company to reach a distribution center of a town, the distribution center redistributes the received natural gas to a plurality of sub-delivery stations in a plurality of areas, the sub-delivery stations deliver the natural gas to a plurality of stations of a plurality of users according to the user demands, and the stations deliver the natural gas to the delivery final station through gas delivery valves. Therefore, the conveying process of the whole natural gas is divided into four stages by the conveying main station, the gas distribution center, the sub-conveying stations, the stations and the conveying terminal stations, wherein the conveying main station is a first stage from the gas distribution center, the second stage from the gas distribution center to the plurality of sub-conveying stations, the third stage from the sub-conveying stations to the plurality of stations and the fourth stage from the stations to the conveying terminal station. The gas distribution center refers to a total receiving station in a city, and is used for receiving natural gas conveyed from a natural gas company or a natural gas factory and uniformly processing and distributing the natural gas; the above-mentioned sub-station refers to a sub-station located in each area of a city, including but not limited to, each enterprise, company, school, community, and factory; the station refers to a station entering a user room, for example, the station in a community conveys natural gas to the user's home through a pipeline, and the pipeline entering the user's home is controlled through a natural gas valve; the delivery end station refers to a station where natural gas is finally output when a user uses the natural gas, such as a cooking bench in the home of the user. The above-mentioned delivery head station, gas distribution center, sub-delivery station, station and delivery terminal are only used for explaining the pipeline laying area and each stage of division in this embodiment, and do not refer to the specific names represented by a certain station, and may also be named as the first station, the second station, the third station, the fourth station, etc.
In this embodiment, the natural gas pipeline in each of the four stages may be selected from different pipeline materials according to actual requirements and laying areas and other factors; therefore, the natural gas pipeline in the first stage is divided into a first pipeline, the natural gas pipeline in the second stage is divided into a second pipeline, the natural gas pipeline in the third stage is divided into a third pipeline, and the natural gas pipeline in the fourth stage is divided into a fourth pipeline; the first pipeline can be classified into gas pipelines according to the purposes; the second pipeline and the third pipeline are divided into gas distribution pipelines, wherein the third pipeline is a low-pressure gas distribution pipeline; the fourth pipeline is divided into a household pipeline. The pipelines with different materials comprise PE pipes, steel pipes, plastic pipes, metal hoses and the like. In practical applications, the first pipeline, the second pipeline and the third pipeline are used for conveying natural gas in a long distance, so that steel pipes, PE pipes, plastic pipes or a mode of combining PE pipes and steel pipes are mostly adopted, and the fourth pipeline is used in a user room, so that the fourth pipeline is mostly a metal hose or a plastic pipe.
Referring to fig. 3, referring to the pipeline monitoring module 2, in one embodiment provided by the present invention, the pipeline monitoring module 2 includes a pipeline interface unit 21, a pipeline segmentation unit 22, a pipeline monitoring unit 23, and a pipeline detection unit 24 that are sequentially connected in communication;
A pipe interface unit 21, configured to obtain a pipe interface and related information thereof, and perform sealing treatment on each two pipe interfaces to form a sealing interface; wherein the related information includes: interface type, interface shape, interface size, interface model and interface material;
a pipeline segmentation unit 22 for segmenting the natural gas pipeline according to pipeline interfaces, one segmented pipeline comprising two non-contacting pipeline interfaces;
a pipe monitoring unit 23 for monitoring the segmented pipe and the sealing interface and transmitting monitoring information to the control center module 6;
and a pipe detection unit 24 for detecting the segmented pipe and the seal interface according to the detection instruction, marking the leaking pipe and generating a marking signal and a positioning signal.
Specifically, the natural gas pipeline is not the whole natural gas pipeline in the whole natural gas transmission process, and is formed by splicing a plurality of natural gas pipelines with proper lengths. In the pipe joint unit 21, each of two ends of each natural gas pipe has a pipe joint, and when two natural gas pipes are spliced, the two pipe joints of the two pipes are connected together to form a sealing joint, and the sealing joint is formed by sealing the two pipe joints. In this embodiment, if a PE pipe is used for the natural gas pipeline, the sealing process is hot-melt welding, and if a steel pipe is used, the sealing process is electric-welding. The sealing process may be performed in various ways, and is specifically determined according to the material of the pipe, and this embodiment is only illustrative by way of two examples, and is not limited thereto. In this embodiment, the related information of the pipe interface includes, but is not limited to: the type of the interface, the shape of the interface, the size of the interface, the type of the interface, the material of the interface, and the like, and the related information is used as a reference when in sealing treatment.
In one embodiment provided by the invention, the sealing interface is wrapped by an industrial sealing film, and the industrial sealing film is provided with a gas pressure sensor and a gas flowmeter. Specifically, the sealing interface is formed by splicing and combining two natural gas pipelines, so that the risk of leakage still exists even if sealing treatment is carried out, the sealing interface is wrapped by an industrial sealing film, and a gas pressure sensor and a gas flowmeter are arranged on the sealing interface, wherein the gas pressure sensor is used for detecting the gas pressure, and the gas flowmeter is used for detecting the quantity of gas flowing in the pipelines. If a gas pressure is detected on the industrial seal membrane and the gas flow meter detects an increased flow rate of natural gas within the pipeline at the seal interface, this indicates that a leak of natural gas has occurred at the seal interface.
In the pipeline segmentation unit 22, the natural gas pipeline is segmented according to pipeline interfaces, thereby forming segmented pipelines. The natural gas pipeline is segmented by the sealing interface to form a segmented pipeline because the pipeline interface is sealed to form a sealing interface, and the two sealing interfaces divide the natural gas pipeline into one segmented pipeline because the two contacting pipeline interfaces form one sealing interface.
In the pipeline monitoring unit 23 and the pipeline detecting unit 24, the pipeline monitoring unit 23 monitors the segmented pipeline and the sealing interface in real time, sends monitoring information obtained by monitoring to the control center module 6, the control center module 6 generates a detection instruction according to the monitoring information, and sends the detection instruction to the pipeline detecting unit 24, the pipeline detecting unit 24 detects the segmented pipeline and the sealing interface after receiving the detection instruction, marks the detected natural gas pipeline with natural gas leakage, marks the detected natural gas pipeline as a leakage pipeline, and generates a marking signal and a positioning signal, wherein the positioning signal is used for rapidly positioning the pipeline with natural gas leakage.
In one embodiment provided by the invention, the detection instruction comprises a detection mode and a detection method; wherein the detection mode comprises alternate detection and combined detection; the detection method comprises the following steps: an interval pressure detection method, a magnetic leakage detection method, a thermal infrared imager detection method, a negative pressure wave detection method and an array eddy current detection method.
Specifically, the control center module 6 generates a detection instruction for the pipe detection unit 24 according to the monitoring information, the detection instruction including the above-described detection manner and the above-described detection method. Because the first pipeline, the second pipeline, the third pipeline and the fourth pipeline may be made of different pipeline materials, and because the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are located in different paving areas, different detection modes and different detection methods can be adopted for pipelines in different stages.
In the detection mode, the above-mentioned alternative detection means that the two detection methods are alternately performed back and forth, and the above-mentioned combined detection means that the two detection methods are combined together for detection. It should be noted that, the alternate detection is not performed by two detection methods at the same time, but is performed in turn, that is, after one detection method ends detection, the other detection method starts detection, and the two detection methods may alternate immediately, or an interval threshold may be set, that is, after one detection method ends and a certain interval, the detection of the next detection method starts again; the combined detection is carried out by two detection methods simultaneously, and the accuracy of the detection result can be further ensured by adopting the detection mode.
In the present embodiment, the above-described alternate detection and combined detection includes two or more detection methods, and is not limited to only two detection methods.
According to different conveying pipelines used in the process of going to the urban gas distribution center and then going to the home of a user from a natural gas company/natural gas factory, different leakage detection means are adopted, so that the condition that one detection means cannot be suitable for the whole conveying process is prevented, the comprehensive detection of natural gas conveying is realized through various means, and the accuracy and timeliness of the leakage detection are further ensured.
With respect to the detection method, several of the above detection methods will be described in detail below.
Referring to fig. 4, regarding the interval pressure detection method, the method includes the following steps:
s101, arranging a sealing sheet in the sealing interface;
s102, arranging a pressure sensor in a segmented pipeline;
s103, sealing the segmented pipeline by using a sealing piece to form a sealed segmented pipeline;
s104, detecting the closed segmented pipeline by using a pressure sensor;
s105, outputting the detected abnormal air pressure change.
Specifically, the segmented pipeline is sealed by the sealing piece, so that the interior of the segmented pipeline is changed into a sealed space, then the pressure sensor is used for detecting the air pressure in the sealed pipeline, if abnormal change of the air pressure is detected, the leakage of the natural gas in the segmented pipeline is indicated, and the abnormal air pressure change is output to the control center module 6. The pressure sensor is used for detecting the air pressure in a pipeline, and comprises a capacitive pressure sensor, a Hall pressure sensor, an inductive pressure sensor or a semiconductor strain gauge pressure sensor.
Referring to fig. 5, regarding the thermal infrared imager detection method, the method includes the following steps:
s201, acquiring a thermal imaging image of a natural gas pipeline;
S202, inputting a thermal imaging image into a convolutional neural network for training, and generating a predicted image model;
s203, acquiring a section thermal imaging image of the segmented pipeline;
s204, inputting the section thermal imaging image into a predictive image model, and outputting a predictive image;
s205, comparing the section thermal imaging image with the predicted image to obtain a gas leakage area.
Specifically, the thermal infrared imager can acquire thermal imaging images of the natural gas pipeline, the acquired thermal imaging images are input into a convolutional neural network for training and learning, and then a predictive image model is generated, and the model can accurately find out the natural gas leakage area through analysis and comparison; the method comprises the steps of collecting section thermal imaging images of a plurality of segmented pipelines in the whole natural gas pipeline, inputting the section thermal imaging images into a predictive image model, further obtaining a predictive image, and finding out a leakage area of natural gas by comparing the predictive image with the section thermal imaging images before input.
Referring to fig. 6, regarding the negative pressure wave detection method, the method includes the following steps:
s301, arranging a high-sensitivity pressure transmitter and a gas flowmeter in the segmented pipeline;
s302, a temperature sensor is arranged outside the segmented pipeline;
S303, detecting negative pressure wave signals and gas pressure in the segmented pipeline by using a high-sensitivity pressure transmitter;
s304, detecting the gas flow in the segmented pipeline by using a gas flowmeter;
s305, if the negative pressure wave signal is detected and the gas pressure and the gas flow rate exceed the set threshold values, calculating the propagation speed of the negative pressure wave signal;
s306, recording the propagation time difference of the negative pressure wave signal reaching the high-sensitivity pressure transmitters at the two sides;
s307, calculating the position of the leakage point according to the propagation speed and the propagation time difference.
In one embodiment of the present invention, the first pipeline uses a negative pressure wave detection method and an interval pressure detection method to perform alternate detection; the second pipeline adopts a thermal infrared imager detection method and a negative pressure wave detection method for combined detection; the third pipeline adopts a negative pressure wave detection method and an interval pressure detection method to carry out alternate detection; and the fourth pipeline adopts a magnetic flux leakage detection method and an array eddy current detection method for combined detection.
Specifically, by distinguishing the leakage modes of the natural gas, the slow leakage (insensitive leakage) or sudden leakage is detected by adopting a mode of alternating or combining a plurality of detection means, so that the natural gas conveying pipeline can be timely detected when the natural gas conveying pipeline leaks in different modes, and the safety of the natural gas conveying is further ensured.
Regarding the leakage positioning module 3, the alarm prompting module 4 and the leakage processing module 5, the position where the natural gas leakage occurs is accurately positioned according to the detection result, and timely prompting is performed through the alarm prompting, so that the economic loss or casualties caused by the fact that the natural gas leakage is not timely processed are prevented by utilizing the positioning accuracy and the prompting timeliness. And the small-scale leakage is treated conventionally, so that the large-scale leakage is treated urgently, the leakage treatment efficiency is enhanced, and the safety is further ensured.
Referring to fig. 7, referring to the control center module 6, the control center module 6 includes a control command unit 61, a data collection unit 62, a data analysis unit 63 and a data storage unit 64, which are sequentially connected in communication;
a control instruction unit 61 for generating control instructions, the control instructions comprising: processing instructions, detecting instructions and collecting instructions;
a data collection unit 62, configured to collect data of each module according to a collection instruction, and classify and sort the data;
a data analysis unit 63, configured to analyze and generalize the collected data of each module, and generate an analysis result report;
a data storage unit 64 for storing each module data;
The data storage unit 64 is also used for providing access rights and access rights for each module.
In relation to the risk assessment module 7, which is connected in communication with the control center module 6, it is used to construct a risk assessment model for real-time risk assessment of natural gas in dynamically changing leak areas from monitoring information, prompt information, process result reports and analysis result reports. The module establishes a natural gas leakage risk assessment model by collecting and analyzing detection data, so as to assess the risk degree of the leaked natural gas, and carry out corresponding treatment according to the assessment result, if the risk degree is extremely high, people in a leakage area need to be rapidly evacuated, and nearby treatment personnel are rapidly dispatched to carry out treatment; the danger assessment model can also provide a processing time (natural gas explosion limit time) for processing personnel to be used as a reference, so that the processing personnel can be prevented from danger caused by too long processing time.
Referring to fig. 8, regarding the leakage pre-warning module 8, the leakage pre-warning module 8 is in communication connection with the risk assessment module 7, and is configured to pre-warn the natural gas pipeline before leakage, and avoid the leakage risk of the natural gas pipeline in advance; the leakage early warning module 8 comprises an engineering information acquisition unit 81, an information analysis comparison unit 82 and a safety early warning unit 83 which are sequentially connected in a communication mode;
An engineering information acquiring unit 81 for acquiring engineering construction information, pipe laying information, and a marking signal;
the information analysis and comparison unit 82 is used for analyzing engineering construction information, comparing analysis results with pipeline laying information, and generating an early warning signal by combining a marking signal;
a safety pre-warning unit 83 for sending a pre-warning notification according to the pre-warning signal;
wherein, engineering construction information includes: construction area, construction range and construction start time; the pipe laying information includes: material, paving area, paving range, paving start time, and paving end time;
wherein the marking signal is used to mark the leaking conduit.
Specifically, the module timely processes the leaked natural gas pipeline by analyzing detection data, and compares the analyzed information with the pipeline laying position by analyzing engineering construction information such as construction site information, so that the natural gas pipeline before leakage is warned, the damage of the natural gas pipeline caused by artificial factors such as construction is prevented, and the large-scale leakage of natural gas is avoided.
In summary, the invention has the following beneficial effects:
(1) According to different conveying pipelines used in the process that a natural gas company/natural gas factory arrives at a city gas distribution center and arrives at a user home, different leakage detection means are adopted, so that the condition that one detection means cannot be suitable for the whole conveying process is prevented, the comprehensive detection of the natural gas conveying pipeline is realized through various means, and the accuracy and timeliness of the leakage detection are further guaranteed.
(2) The position where natural gas leakage occurs is accurately positioned according to the detection result, and timely reminding is carried out through alarm prompt, so that economic loss or casualties caused by natural gas leakage but not timely treatment are prevented by utilizing the positioning accuracy and the reminding timeliness.
(3) The method for distinguishing the leakage of the natural gas adopts a mode of alternately or combining a plurality of detection means to detect slow leakage (insensitive leakage) or sudden leakage, ensures that the natural gas conveying pipeline can be timely detected when the natural gas conveying pipeline leaks in different modes, and further ensures the safety of natural gas conveying.
(4) The natural gas pipeline after leakage is timely processed through analysis and detection data, engineering construction information such as construction site information is analyzed, the analyzed information is compared with the pipeline laying position, and therefore early warning notification is carried out on the natural gas pipeline before leakage, natural gas pipeline damage caused by artificial factors such as construction is prevented, and large-scale leakage of natural gas is avoided.
(5) By collecting and analyzing detection data, a risk assessment model of natural gas leakage is established, so that the risk degree of the leaked natural gas is assessed, corresponding treatment is carried out according to the assessment result, if the risk degree is extremely high, people in a leakage area need to be evacuated rapidly, and nearby treatment personnel are dispatched rapidly for treatment; the danger assessment model can also provide a processing time (natural gas explosion limit time) for processing personnel to be used as a reference, so that the processing personnel can be prevented from danger caused by too long processing time.
Example 2
Referring to fig. 9, the present invention provides a method for monitoring natural gas leakage, comprising the following steps:
s1, dividing a natural gas pipeline into a first pipeline, a second pipeline, a third pipeline and a fourth pipeline according to the material, the application and the laying area of the natural gas pipeline;
s2, treating a plurality of interfaces of the natural gas pipeline and segmenting the natural gas pipeline;
s3, monitoring the interface and the segmented pipeline in real time to generate monitoring information;
s4, generating a detection instruction according to the monitoring information;
s5, detecting the segmented pipeline and the interface according to the detection instruction, marking the leakage pipeline and generating a marking signal and a positioning signal;
s6, determining the position of the leakage pipeline according to the positioning signal, and generating an alarm signal;
s7, sending out leakage alarm according to the alarm signal and generating prompt information;
s8, generating a processing instruction according to the alarm signal and the prompt information;
s9, processing the leakage pipeline according to the processing instruction and generating a processing result report;
s10, generating a collection instruction, collecting data of each module of the system according to the collection instruction, and classifying and sorting;
s11, analyzing and summarizing the collected data of each module of the system to generate an analysis result report;
S12, storing data of each module of the system and providing retrieval rights and access rights for each module of the system;
s13, constructing a risk assessment model according to the monitoring information, the prompt information, the processing result report and the analysis result report;
s14, carrying out real-time risk degree assessment on the dynamic change of the natural gas in the leakage area according to the risk assessment model;
s15, acquiring engineering construction information, pipeline laying information and marking signals;
s16, analyzing engineering construction information, comparing analysis results with pipeline laying information, and generating an early warning signal by combining a marking signal;
s17, sending an early warning notice according to an early warning signal, and avoiding the leakage risk of the natural gas pipeline in advance;
the detection instruction comprises a detection mode and a detection method; the detection mode comprises alternate detection and combined detection; the detection method comprises the following steps: an interval pressure detection method, a magnetic leakage detection method, a thermal infrared imager detection method, a negative pressure wave detection method and an array eddy current detection method;
the first pipeline adopts a negative pressure wave detection method and an interval pressure detection method to alternately detect; the second pipeline adopts a thermal infrared imager detection method and a negative pressure wave detection method for combined detection; the third pipeline adopts a negative pressure wave detection method and an interval pressure detection method to carry out alternate detection; and the fourth pipeline adopts a magnetic flux leakage detection method and an array eddy current detection method for combined detection.
Specifically, according to different conveying pipelines used in the process of going to the urban gas distribution center and then going to the home of a user from a natural gas company/natural gas factory, different leakage detection means are adopted, so that the situation that one detection means cannot be suitable for the whole conveying process is prevented, the omnibearing detection of the natural gas conveying pipeline is realized through various means, and the accuracy and timeliness of the leakage detection are further ensured; the method comprises the steps of accurately positioning the position where natural gas leakage occurs according to a detection result, prompting in time through an alarm, and preventing economic loss or casualties caused by natural gas leakage but not timely treatment by utilizing the accuracy of positioning and the timeliness of prompting; by distinguishing the leakage modes of the natural gas, the slow leakage (insensitive leakage) or sudden leakage is detected by adopting a mode of alternating or combining a plurality of detection means, so that the natural gas conveying pipeline can be timely detected when the natural gas conveying pipeline leaks in different modes, and the safety of the natural gas conveying is further ensured; the method comprises the steps of timely processing a natural gas pipeline after leakage through analysis and detection data, comparing analyzed engineering construction information such as construction site information with the laying position of a pipeline, and accordingly carrying out early warning notification on the natural gas pipeline before leakage to prevent the natural gas pipeline from being damaged due to artificial factors such as construction and the like, and further avoiding large-scale leakage of natural gas; by collecting and analyzing detection data, a risk assessment model of natural gas leakage is established, so that the risk degree of the leaked natural gas is assessed, corresponding treatment is carried out according to the assessment result, if the risk degree is extremely high, people in a leakage area need to be evacuated rapidly, and nearby treatment personnel are dispatched rapidly for treatment; the danger assessment model can also provide a processing time (natural gas explosion limit time) for processing personnel to be used as a reference, so that the processing personnel can be prevented from danger caused by too long processing time.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional units and modules according to needs, i.e. the interior of the system is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The present invention is not limited to the above embodiments, but is not limited to the above embodiments, and any modifications, equivalents and variations made to the above embodiments according to the technical matter of the present invention can be made by those skilled in the art without departing from the scope of the technical matter of the present invention.
Claims (10)
1. A natural gas leak monitoring system, characterized by: the system comprises a pipeline dividing module, a pipeline monitoring module, a leakage positioning module, an alarm prompting module, a leakage processing module and a control center module which are sequentially connected in a communication mode;
the pipeline dividing module is used for dividing the natural gas pipeline into a first pipeline, a second pipeline, a third pipeline and a fourth pipeline according to the material, the application and the laying area of the natural gas pipeline;
the pipeline monitoring module is used for processing a plurality of pipeline interfaces of the natural gas pipeline and segmenting the natural gas pipeline to form segmented pipelines; the pipeline interface and the segmented pipeline are monitored and detected in real time, and a leakage pipeline with natural gas leakage is marked to generate a marking signal and a positioning signal;
the leakage positioning module is used for determining the position of the leakage pipeline according to the positioning signal and generating an alarm signal;
the alarm prompting module comprises an alarm unit and a prompting unit; the alarm unit is used for sending out leakage alarm according to the alarm signal; the prompting unit is used for generating prompting information; wherein, the prompt message includes: leakage position, leakage start time, leakage amount, diffusion speed, and environmental information;
The control center module is used for generating a processing instruction according to the alarm signal and the prompt information;
the leakage processing module is used for processing the leakage pipeline according to the processing instruction and generating a processing result report;
the control center module is also used for collecting data of each module and analyzing the data of each module to generate an analysis result report; the system is also used for storing the data of each module; and is also used for generating detection instructions.
2. A natural gas leak monitoring system as defined in claim 1, wherein: the pipeline monitoring module comprises a pipeline interface unit, a pipeline segmentation unit, a pipeline monitoring unit and a pipeline detection unit which are sequentially connected in a communication mode;
the pipeline interface unit is used for acquiring the pipeline interfaces and related information thereof, and sealing each two pipeline interfaces to form a sealing interface; wherein the related information includes: interface type, interface shape, interface size, interface model and interface material;
the pipeline segmentation unit is used for segmenting the natural gas pipeline according to the pipeline interface to form a segmented pipeline;
the pipeline monitoring unit is used for monitoring the segmented pipeline and the sealing interface and sending monitoring information to the control center module;
The pipeline detection unit is used for detecting the segmented pipeline and the sealing interface according to the detection instruction, marking the leakage pipeline and generating the marking signal and the positioning signal.
3. A natural gas leak monitoring system as defined in claim 2, wherein: the detection instruction comprises a detection mode and a detection method; wherein the detection mode comprises alternate detection and combined detection.
4. A natural gas leakage monitoring system according to claim 3, wherein: the detection method comprises the following steps: an interval pressure detection method, a magnetic leakage detection method, a thermal infrared imager detection method, a negative pressure wave detection method and an array eddy current detection method.
5. A natural gas leak monitoring system as defined in claim 4, wherein: the first pipeline adopts the negative pressure wave detection method and the interval pressure detection method to carry out the alternate detection; the second pipeline adopts the thermal infrared imager detection method and the negative pressure wave detection method to carry out the combined detection; the third pipeline adopts the negative pressure wave detection method and the interval pressure detection method to carry out the alternate detection; and the fourth pipeline adopts the magnetic leakage detection method and the array eddy current detection method to carry out the combined detection.
6. A natural gas leak monitoring system as defined in claim 2, wherein: the sealing interface is wrapped by an industrial sealing film, and an air pressure sensor and an air flow meter are arranged on the industrial sealing film.
7. A natural gas leak monitoring system as defined in claim 1, wherein: the control center module comprises a control instruction unit, a data collection unit, a data analysis unit and a data storage unit which are sequentially connected in a communication mode;
the control instruction unit is configured to generate a control instruction, where the control instruction includes: the processing instruction, the detecting instruction and the collecting instruction;
the data collection unit is used for collecting the data of each module according to the collection instruction and classifying and sorting the data;
the data analysis unit is used for analyzing and summarizing the collected data of each module and generating an analysis result report;
the data storage unit is used for storing the data of each module;
the data storage unit is also used for providing retrieval rights and access rights for the modules.
8. A natural gas leak monitoring system as defined in claim 2, wherein: the risk assessment module is in communication connection with the control center module and is used for constructing a risk assessment model according to the monitoring information, the prompt information, the processing result report and the analysis result report; the risk assessment model is used for carrying out real-time risk degree assessment on natural gas in a dynamically changing leakage area.
9. A natural gas leakage monitoring system according to claim 8, wherein: the leakage early warning module is in communication connection with the risk assessment module and is used for early warning the natural gas pipeline before leakage and avoiding the leakage risk of the natural gas pipeline in advance; the leakage early warning module comprises an engineering information acquisition unit, an information analysis comparison unit and a safety early warning unit which are sequentially connected in a communication mode;
the engineering information acquisition unit is used for acquiring engineering construction information, pipeline laying information and the marking signal;
the information analysis and comparison unit is used for analyzing the engineering construction information, comparing the analysis result with the pipeline laying information and generating an early warning signal by combining the marking signal;
the safety early warning unit is used for sending an early warning notice according to the early warning signal;
wherein the engineering construction information includes: construction area, construction range and construction start time; the pipe laying information includes: the material, the paving area, the paving range, the paving start time and the paving end time;
wherein the marking signal is used to mark the leak conduit.
10. A natural gas leak monitoring method, characterized by: the method comprises the following steps:
s1, dividing a natural gas pipeline into a first pipeline, a second pipeline, a third pipeline and a fourth pipeline according to the material, the application and the laying area of the natural gas pipeline;
s2, treating a plurality of interfaces of the natural gas pipeline and segmenting the natural gas pipeline;
s3, monitoring the interface and the segmented pipeline in real time to generate monitoring information;
s4, generating a detection instruction according to the monitoring information;
s5, detecting the segmented pipeline and the interface according to the detection instruction, marking the leakage pipeline and generating a marking signal and a positioning signal;
s6, determining the position of the leakage pipeline according to the positioning signal, and generating an alarm signal;
s7, sending out leakage alarm according to the alarm signal and generating prompt information;
s8, generating a processing instruction according to the alarm signal and the prompt information;
s9, processing the leakage pipeline according to the processing instruction and generating a processing result report;
s10, generating a collection instruction, collecting data of each module of the system according to the collection instruction, and classifying and sorting;
s11, analyzing and summarizing the collected data of each module of the system to generate an analysis result report;
S12, storing data of each module of the system and providing retrieval rights and access rights for each module of the system;
s13, constructing a risk assessment model according to the monitoring information, the prompt information, the processing result report and the analysis result report;
s14, carrying out real-time risk degree assessment on the dynamic change of the natural gas in the leakage area according to the risk assessment model;
s15, acquiring engineering construction information, pipeline laying information and the marking signals;
s16, analyzing the engineering construction information, comparing an analysis result with the pipeline laying information, and generating an early warning signal by combining the marking signal;
s17, sending an early warning notice according to the early warning signal, and avoiding the leakage risk of the natural gas pipeline in advance;
the detection instruction comprises a detection mode and a detection method; the detection mode comprises alternate detection and combined detection; the detection method comprises the following steps: an interval pressure detection method, a magnetic leakage detection method, a thermal infrared imager detection method, a negative pressure wave detection method and an array eddy current detection method;
the first pipeline adopts the negative pressure wave detection method and the interval pressure detection method to carry out the alternate detection; the second pipeline adopts the thermal infrared imager detection method and the negative pressure wave detection method to carry out the combined detection; the third pipeline adopts the negative pressure wave detection method and the interval pressure detection method to carry out the alternate detection; and the fourth pipeline adopts the magnetic leakage detection method and the array eddy current detection method to carry out the combined detection.
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