A dynamic gas leakage monitoring system

Abstract

The present invention provides a dynamic gas leakage monitoring system, particularly relating to the technical field of natural gas pipeline safety, including a data acquisition module for acquiring data inside the natural gas pipeline; a data processing module including a data transmission unit, a data reception unit, and a data analysis unit; a control execution module including a control acquisition unit for controlling the data acquisition module to perform acquisition, an analysis control unit for performing control analysis on a plurality of data received by the data analysis unit, a welding quality evaluation unit for evaluating the quality of the structural image of the natural gas pipeline, an optimization unit for optimization, and a control adjustment unit for adjusting the monitoring method; an alarm module for emitting sound and light signals; a data recording module for recording gas data; and a remote monitoring module for allowing users to monitor the gas leakage situation. This system has high-efficient production management capabilities and improves the efficiency in production management.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas pipeline safety, and particularly to a gas leakage dynamic monitoring system. Background Art

[0002] Natural gas is an essential energy source in urban residents' lives. Currently, natural gas companies basically carry out gas supply services through pipeline transportation. Natural gas pipelines can be said to be one of the urban infrastructure that has a great impact on the daily lives of urban residents. Urban natural gas pipeline projects are all buried underground. Under the influence of various reasons such as corrosion, the natural gas transmission pipeline may be damaged and leaked after long-term use, causing accidents and huge economic losses and energy losses. Therefore, for the maintenance of natural gas pipelines, the most crucial issue is to promptly detect the leakage of natural gas pipelines and accurately locate the leakage points of natural gas pipelines.

[0003] Chinese Patent Publication No.: CN113341831A discloses a combustible gas alarm control system. The alarm control system includes a microprocessor, a three-dimensional dynamic analysis system, and a prevention and control system. The microprocessor is electrically connected to the three-dimensional dynamic analysis system and the prevention and control system. The three-dimensional dynamic analysis system monitors combustible gas and transmits the monitoring data to the microprocessor. The microprocessor processes the data transmitted by the three-dimensional dynamic analysis system, and the prevention and control system prevents and controls combustible gas. The three-dimensional dynamic analysis system monitors the diffusion direction, diffusion rate, and concentration of combustible gas, thereby analyzing the leakage amount and leakage rate of combustible gas. The prevention and control system conducts targeted and effective control based on the leakage amount and leakage rate to avoid danger caused by improper handling. Thus, the existing technology has the following problems:

[0004] 1. The existing combustible gas leakage alarm detection system cannot effectively collect gas concentration data in the environment and pressure data of natural gas pipelines;

[0005] 2. The existing combustible gas leakage alarm detection system operates independently and cannot be connected to the control system, and cannot trigger an alarm when the gas concentration exceeds the threshold to remind the staff to pay attention;

[0006] 3. The existing combustible gas leakage alarm detection system lacks control and adjustment of the warning concentration, and the accuracy and reliability are not high. Summary of the Invention

[0007] Therefore, the present invention provides a gas leakage dynamic monitoring system to overcome the problems in the prior art that the gas concentration data in the environment and the pressure data of natural gas pipelines cannot be effectively collected, resulting in inaccurate monitoring results and the inability to promptly discover and handle potential gas leakage risks.

[0008] To achieve the above object, the present invention provides a gas leakage dynamic monitoring system, comprising:

[0009] A data acquisition module, which includes a pressure sensor for collecting the gas pressure in the natural gas pipeline, a concentration sensor for collecting the gas concentration in the environment where the natural gas pipeline is located, an infrared camera for collecting the infrared image of the natural gas pipeline, and an industrial camera for collecting the structural image of the natural gas pipeline;

[0010] A data processing module, which is connected to the data acquisition module, and includes a data transmission unit for transmitting the data collected by the data acquisition module to the data analysis unit, a data receiving unit for receiving the gas concentration, gas pressure, structural image and infrared image transmitted by the data transmission module, and a data analysis unit for performing real-time processing and analysis on the several data received by the data receiving unit;

[0011] A control execution module, which is respectively connected to the data acquisition module and the data processing module. The control execution module includes a control acquisition unit for controlling the data acquisition module to perform acquisition, an analysis control unit for performing control analysis according to the several data received by the data analysis unit, a welding quality evaluation unit for performing quality evaluation according to the structural image of the natural gas pipeline, an optimization unit for optimizing the warning concentration, and a control adjustment unit for adjusting the monitoring method;

[0012] An alarm module, which is connected to the control execution module, and includes that when the control module detects a gas concentration exceeding the threshold, the alarm module will be triggered to emit sound and light signals to remind the staff to pay attention;

[0013] A data recording module, which is connected to the alarm module, is used for recording the gas concentration and the gas pressure data of the natural gas pipeline, and storing the data on a local device or a remote server;

[0014] A remote monitoring module: which is respectively connected to the data processing module and the control execution module, and includes a remote control unit for allowing users to monitor the gas leakage situation through a remote device, view the gas concentration data in real time, receive alarm information, and perform remote control operations.

[0015] Further, the control acquisition unit in the control execution module controls the industrial camera in the data acquisition module to acquire images of the natural gas pipeline structure in the area to be monitored. The data analysis unit in the data processing module analyzes the structure image data of the natural gas pipeline transmitted by the data transmission unit. The welding quality evaluation unit generates the welding quality evaluation value of the natural gas pipeline in the area to be monitored in the structure image. The data analysis unit compares the welding quality evaluation value with the preset welding quality evaluation value to determine the monitoring method for the gas leakage process according to the comparison result. If the welding quality evaluation value is greater than the preset welding quality evaluation value, the data analysis unit determines that the monitoring mode of the infrared camera is the first monitoring method, and the first monitoring method satisfies determining the monitoring image of the infrared camera according to the real-time gas pressure in the pipeline detected by the pressure gauge and the preset gas pressure. If the welding quality evaluation value is less than the preset welding quality evaluation value, the data analysis unit receives the structure image of the natural gas pipeline transmitted by the data transmission unit and determines that the working mode of the infrared camera is the second monitoring method. The second monitoring method satisfies detecting by combining the infrared camera and the concentration sensor at the same time. The infrared camera monitors at a second time interval as a cycle and obtains the monitoring data of the concentration sensor, and determines the warning concentration of the concentration sensor according to the real-time gas concentration in the pipeline to determine whether there is a leakage.

[0016] Further, the data analysis unit calculates the welding quality rating value W according to the following formula. Set

[0017]

[0018] where di represents the surface depression depth value of the i-th solder joint in the welding image, dz is the maximum surface depression depth value in the historical operation data, Aj represents the solder joint area in the i-th historical operation data, and Az represents the maximum solder joint area in the historical operation data.

[0019] Further, in the first monitoring method, the data analysis unit determines the time interval of the infrared image according to the comparison result of the gas pressure and the preset gas pressure, and the data transmission unit determines the time interval of the infrared image according to the comparison result of the gas pressure and the preset gas pressure. If the gas pressure is less than or equal to the preset gas pressure, the data transmission unit determines that the time interval for the infrared camera to take pictures is the first time interval. If the gas pressure is greater than the preset gas pressure, the data transmission unit determines that the time interval for the infrared camera to take pictures is the second time interval.

[0020] Further, when the real-time gas pressure at the leakage point is at the second pressure of the first monitoring mode, the data analysis unit compares the hot zone area in the infrared thermal imager image with the preset hot zone area, and determines whether there is a leakage in the natural gas pipeline according to the comparison result. If the hot zone area is less than or equal to the preset hot zone area, the data analysis unit determines that there is no leakage in the natural gas pipeline; if the hot zone area is greater than the preset hot zone area, the data acquisition module determines that there is a leakage in the natural gas pipeline.

[0021] Further, when the infrared camera is in the second monitoring mode, the data transmission unit compares the real-time gas concentration at the leakage point in the pipeline with the preset gas concentration, and the data transmission unit determines whether there is a leakage in the natural gas pipeline according to the comparison result; if the real-time gas concentration is greater than the preset gas concentration, the data transmission unit determines that there is a leakage in the natural gas pipeline; if the real-time gas concentration is less than or equal to the preset gas concentration, the data transmission unit determines that there is no leakage in the natural gas pipeline.

[0022] Further, when the operating mode of the infrared camera is in the second monitoring mode, the data optimization unit compares the gas concentration change amount in the pipeline with the preset gas concentration change amount according to the gas concentration change value detected by the concentration sensor, so as to optimize the warning concentration according to the comparison result. If the gas concentration change amount is less than or equal to the preset gas concentration change amount, the data optimization unit determines that the warning concentration remains unchanged; if the gas concentration change amount is greater than the preset gas concentration change amount, the data optimization unit determines that the warning concentration is reduced to 3% LEL (volume percentage).

[0023] Further, the control adjustment unit in the control module determines the adjustment method for the corresponding monitoring mode according to the service life of the pipeline and the historical leakage rate. If both the service life and the historical leakage rate do not exceed the standard, the control adjustment unit determines not to adjust the corresponding monitoring mode; if one of the service life and the historical leakage rate exceeds the standard, the control adjustment unit determines that the corresponding monitoring mode is the first adjustment method. If both the service life and the historical leakage rate exceed the standard, the control adjustment unit determines that the corresponding monitoring mode is the second adjustment method.

[0024] Further, the first adjustment method is to increase the number of pressure sensors by 5 in the first monitoring mode, set the warning concentration to 2% LEL, and shorten the time interval for the infrared camera to obtain images in the second monitoring mode, and adjust the time interval to 2 s; the second adjustment method is to increase the number of pressure sensors by 10 in the first monitoring mode, adjust the warning concentration to 1% LEL, and shorten the time interval for the infrared camera to obtain images in the second monitoring mode, and adjust the time interval to 1 s.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows. The present invention evaluates the quality through the welding quality evaluation unit according to the welding condition of the natural gas pipeline, determines the monitoring method of the infrared camera in the gas leakage dynamic monitoring system. The concentration sensor and pressure sensor in the data processing module sense the changes in gas concentration and air pressure, and determine the leakage situation in combination with the structural image of the natural gas pipeline captured by the industrial camera and the hot area captured by the infrared camera. The collected data is transmitted through the data transmission module, processed and analyzed in a timely manner by the data analysis unit, the warning concentration is optimized by the optimization unit, the relevant monitoring method is adjusted by the control adjustment unit, the gas pressure data is recorded by the data recording module, and real-time monitoring is carried out through the remote monitoring module, improving the detection accuracy, being able to obtain more comprehensive information on gas leakage, and better monitoring and identifying potential gas leakage situations.

[0026] Further, the data acquisition module performs image acquisition on the area to be monitored, analyzes the acquired image to determine the comparison result between the welding quality evaluation value of the pipeline in the area to be monitored in the image and the preset welding quality evaluation value, and determines the monitoring method of the infrared camera in the gas leakage dynamic monitoring system, improving the detection accuracy, being able to timely discover welding problems or abnormal situations, and according to the comparison result, adjusting the monitoring method of the infrared camera in real time to better monitor and identify potential gas leakage situations.

[0027] Further, the data acquisition module determines the welding quality evaluation value of the natural gas pipeline in the area to be monitored in the structural image according to the acquired structural image. According to the comparison result between the welding quality evaluation value and the preset welding quality evaluation value, the analysis and control unit analyzes the comparison result to determine the monitoring method for the gas leakage process, improving the detection accuracy, being able to timely discover welding problems or abnormal situations, and being able to better monitor and identify potential gas leakage situations.

[0028] Further, in the first monitoring method, the data analysis unit analyzes the comparison result between the gas pressure and the preset gas pressure by the analysis and control unit, and the data transmission unit determines the time interval of the infrared image, improving the accuracy and real-time performance of the infrared camera monitoring, being able to timely discover abnormal situations, and according to the comparison result, adjusting the monitoring method of the infrared camera in real time to better monitor and identify potential gas leakage situations.

[0029] Furthermore, when the real-time gas pressure at the leakage point is at the second pressure of the first monitoring method, according to the comparison result between the hot zone area in the infrared thermal imager image and the preset hot zone area, the analysis and control unit analyzes the comparison result to determine whether there is a leakage in the natural gas pipeline. When the data acquisition module determines that there is a leakage in the natural gas pipeline, it simultaneously triggers the alarm module to emit sound and light signals, records the gas pressure data through the data recording module, and conducts real-time monitoring through the remote monitoring module, improving the detection accuracy, enabling more comprehensive acquisition of gas leakage information, facilitating early warning and prevention, discovering potential leakage risks in advance, and taking timely measures for early warning and prevention, reducing the occurrence of accidents, protecting the safety of staff. The automatic monitoring and alarm functions of the system reduce the workload of manual inspection and monitoring, improving work efficiency.

[0030] Furthermore, when the infrared camera is in the second monitoring method, according to the comparison result between the real-time gas concentration at the leakage point in the pipeline and the preset gas concentration, the analysis and control unit analyzes the comparison result to determine whether there is a leakage in the natural gas pipeline. When the data transmission unit determines that there is a leakage in the natural gas pipeline, it simultaneously triggers the alarm module to emit sound and light signals, records the gas concentration data through the data recording module, and conducts real-time monitoring through the remote monitoring module, improving the detection accuracy, enabling more comprehensive acquisition of gas leakage information, facilitating early warning and prevention, discovering potential leakage risks in advance, and taking timely measures for early warning and prevention, reducing the occurrence of accidents, protecting the safety of staff. The automatic monitoring and alarm functions of the system reduce the workload of manual inspection and monitoring, improving work efficiency.

[0031] Furthermore, when the working mode of the infrared camera is in the second monitoring method, the data optimization unit compares the concentration change amount in the pipeline with the preset concentration change amount according to the concentration change value detected by the concentration sensor. The analysis and control unit analyzes the comparison result to optimize the warning concentration based on the comparison result. Further optimizing the warning concentration can accurately and flexibly determine the leakage situation, improving the accuracy and precision of leakage detection, thereby effectively preventing the occurrence of accidents and ensuring the safety of personnel and equipment.

[0032] Furthermore, the control and adjustment unit in the control module determines the adjustment method for the corresponding monitoring method according to the service life of the pipeline and the historical leakage rate. According to the actual situation of the pipeline, the corresponding monitoring method can be flexibly adjusted by adding sensors, reducing the warning concentration, and shortening the shooting time interval of the infrared camera, so as to improve the accuracy and adaptability of leakage detection. When both the service life and the historical leakage rate do not exceed the standard, the corresponding monitoring method is not adjusted; when one of the monitoring methods exceeds the standard, the system will adopt the first adjustment method, increase the number of sensors in the first monitoring method, and reduce the warning concentration. At the same time, in the second monitoring method, the time interval for the infrared camera to obtain images is shortened, which can increase the sensitivity and accuracy of monitoring and improve the detection effect when natural gas leaks. When both monitoring methods exceed the standard, the system will adopt the second adjustment method, continue to increase the number of pressure sensors, reduce the warning concentration, and further shorten and adjust the time interval for the infrared camera to obtain images in the second monitoring method, improving the efficiency and reliability of leakage detection, thus effectively preventing accidents and ensuring the safety of personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural block diagram of the gas leakage dynamic monitoring system according to an embodiment of the present invention;

[0034] Figure 2 It is a structural block diagram of the data acquisition module of the gas leakage dynamic monitoring system according to an embodiment of the present invention;

[0035] Figure 3 It is a structural block diagram of the data processing module of the gas leakage dynamic monitoring system according to an embodiment of the present invention;

[0036] Figure 4 It is a structural block diagram of the control and execution module of the gas leakage dynamic monitoring system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to make the objectives and advantages of the present invention clearer and more understandable, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0039] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0040] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] Please refer to Figures 1 - 4 as shown Figure 1 which is the structural block diagram of the gas leakage dynamic monitoring system according to the embodiment of the present invention; Figure 2 which is the structural block diagram of the data acquisition module of the gas leakage dynamic monitoring system according to the embodiment of the present invention;

[0042] Figure 3 which is the structural block diagram of the data processing module of the gas leakage dynamic monitoring system according to the embodiment of the present invention; Figure 4 which is the structural block diagram of the control execution module of the gas leakage dynamic monitoring system according to the embodiment of the present invention.

[0043] An embodiment of the present invention provides a gas leakage dynamic monitoring system, including:

[0044] A data acquisition module, which includes a pressure sensor for collecting the gas pressure in the natural gas pipeline, a concentration sensor for collecting the gas concentration in the environment where the natural gas pipeline is located, an infrared camera for collecting the infrared image of the natural gas pipeline, and an industrial camera for collecting the structural image of the natural gas pipeline;

[0045] A data processing module, which is connected to the data acquisition module, and includes a data transmission unit for transmitting the data collected by the data acquisition module to the data analysis unit, a data receiving unit for receiving the gas concentration, gas pressure, structural image and infrared image transmitted by the data transmission module, and a data analysis unit for performing real-time processing and analysis on the several data received by the data receiving unit;

[0046] A control execution module, which is respectively connected to the data acquisition module and the data processing module. The control execution module includes a control acquisition unit for controlling the data acquisition module to perform acquisition, an analysis control unit for performing control analysis based on a number of data received by the data analysis unit, a welding quality evaluation unit for evaluating the quality based on the structural image of the natural gas pipeline, an optimization unit for optimizing the warning concentration, and a control adjustment unit for adjusting the monitoring method;

[0047] An alarm module, which is connected to the control execution module and includes a unit that when the control module detects a gas concentration exceeding the threshold, will trigger the alarm module to emit sound and light signals to alert the staff;

[0048] A data recording module, which is connected to the alarm module and is used to record the gas concentration and the gas pressure data of the natural gas pipeline, and store the data on a local device or a remote server;

[0049] A remote monitoring module: which is respectively connected to the data processing module and the control execution module, and includes a remote control unit for allowing users to monitor the gas leakage situation through a remote device, view the gas concentration data in real time, receive alarm information, and perform remote control operations.

[0050] In an embodiment of the present invention, the number of the data includes gas concentration, gas pressure, structural image, and infrared image.

[0051] Specifically, the control acquisition unit in the control execution module controls the industrial camera in the data acquisition module to acquire the structural image of the natural gas pipeline in the area to be monitored. The data analysis unit in the data processing module analyzes the structural image data of the natural gas pipeline transmitted by the data transmission unit, and the welding quality evaluation unit generates the welding quality evaluation value of the natural gas pipeline in the area to be monitored in the structural image. The data analysis unit compares the welding quality evaluation value W with the preset welding quality evaluation value W0 to determine the monitoring method for the gas leakage process according to the comparison result;

[0052] If W > W0, the data analysis unit determines that the monitoring mode of the infrared camera is the first monitoring method, and the first monitoring method satisfies determining the monitoring image of the infrared camera according to the real-time gas pressure in the pipeline detected by the pressure gauge and the preset gas pressure;

[0053] If W ≤ W0, the data analysis unit receives the structural image of the natural gas pipeline transmitted by the data transmission unit, determines that the operating mode of the infrared camera is the second monitoring method, and the second monitoring method satisfies the detection by combining the infrared camera and the concentration sensor at the same time. The infrared camera monitors at a second time interval as a cycle and obtains the monitoring data of the concentration sensor, determines the warning concentration of the concentration sensor according to the real-time gas concentration in the pipeline, so as to determine whether there is a leakage.

[0054] Specifically, the data acquisition module determines the welding quality evaluation value of the natural gas pipeline in the area to be monitored in the structural image according to the acquired structural image. According to the comparison result between the welding quality evaluation value and the preset welding quality evaluation value, the analysis and control unit analyzes the comparison result to determine the monitoring method for the gas leakage process, improves the detection accuracy, can timely discover welding problems or abnormal situations, and can better monitor and identify potential gas leakage situations.

[0055] Specifically, the data analysis unit calculates the welding quality rating value W according to the following formula, and sets

[0056]

[0057] where the preset welding quality evaluation value is 2, di represents the surface depression depth value of the i-th solder joint in the welding image, dz is the maximum surface depression depth value in the historical operation data, Aj represents the solder joint area in the i-th historical operation data, and Az represents the maximum solder joint area in the historical operation data.

[0058] Specifically, in the first monitoring method, the data analysis unit determines the time interval of the infrared image according to the comparison result between the gas pressure P and the preset gas pressure P0, and the data transmission unit determines the time interval of the infrared image according to the comparison result between the gas pressure and the preset gas pressure.

[0059] If P ≤ P0, the data transmission unit determines that the time interval for the infrared camera to take pictures is the first time interval.

[0060] If P > P0, the data transmission unit determines that the time interval for the infrared camera to take pictures is the second time interval.

[0061] Specifically, in the first monitoring method, the data analysis unit analyzes the comparison result according to the comparison result between the gas pressure and the preset gas pressure, and the data transmission unit determines the time interval of the infrared image, which improves the accuracy and real-time performance of the infrared camera monitoring, can timely discover abnormal situations, and adjusts the monitoring method of the infrared camera in real time according to the comparison result, so as to better monitor and identify potential gas leakage situations.

[0062] Specifically, when the real-time gas pressure at the leakage point is at the second pressure of the first monitoring method, the data analysis unit compares the hot zone area S in the infrared thermal imager image with the preset hot zone area S0, and determines whether there is a leakage in the natural gas pipeline according to the comparison result.

[0063] If S ≤ S0, the data analysis unit determines that there is no leakage in the natural gas pipeline.

[0064] If S > S0, the data acquisition module determines that there is a leakage in the natural gas pipeline.

[0065] Among them, the preset hot zone area is 0.3 cm 2 , when the data acquisition module determines that there is a leakage in the natural gas pipeline, it simultaneously triggers the alarm module to emit sound and light signals.

[0066] Specifically, when the real-time gas pressure at the leakage point is at the second pressure of the first monitoring method, according to the comparison result of the hot zone area in the infrared thermal imager image and the preset hot zone area, the analysis and control unit analyzes the comparison result to determine whether there is a leakage in the natural gas pipeline. When the data acquisition module determines that there is a leakage in the natural gas pipeline, it simultaneously triggers the alarm module to emit sound and light signals, records the gas pressure data through the data recording module, and conducts real-time monitoring through the remote monitoring module, improving the detection accuracy, being able to obtain more comprehensive information on gas leakage, facilitating early warning and prevention, discovering potential leakage risks in advance, and taking timely measures for early warning and prevention, reducing the occurrence of accidents, protecting the safety of staff. The automatic monitoring and alarm functions of the system reduce the workload of manual inspection and monitoring, improving work efficiency.

[0067] Specifically, when the infrared camera is in the second monitoring method, the data transmission unit compares the real-time gas concentration C at the leakage point in the pipeline with the preset gas concentration C0, and the data transmission unit determines whether there is a leakage in the natural gas pipeline according to the comparison result.

[0068] If C > C0, the data transmission unit determines that there is a leakage in the natural gas pipeline.

[0069] If C ≤ C0, the data transmission unit determines that there is no leakage in the natural gas pipeline.

[0070] Among them, the preset gas concentration is 0.2 LEL. When the data transmission unit determines that there is a leakage in the natural gas pipeline, it simultaneously triggers the alarm module to emit sound and light signals. Those skilled in the art can adjust the preset gas concentration according to specific circumstances.

[0071] Specifically, when the infrared camera is in the second monitoring mode, according to the comparison result between the real-time gas concentration at the leakage point in the pipeline and the preset gas concentration, the analysis and control unit analyzes the comparison result to determine whether there is a leakage in the natural gas pipeline. The data transmission unit determines that there is a leakage in the natural gas pipeline, and at the same time triggers the alarm module to emit sound and light signals, records the gas concentration data through the data recording module, and conducts real-time monitoring through the remote monitoring module, which improves the detection accuracy, can obtain more comprehensive gas leakage information, is conducive to early warning and prevention, discovers potential leakage risks in advance, and takes measures in time for early warning and prevention, reduces the occurrence of accidents, protects the safety of staff, and the automatic monitoring and alarm functions of the system reduce the workload of manual inspection and monitoring and improve work efficiency.

[0072] Specifically, when the working mode of the infrared camera is in the second monitoring mode, the data optimization unit compares the gas concentration change amount ΔC in the pipeline with the preset gas concentration change amount ΔC0 according to the concentration change value detected by the concentration sensor, so as to optimize the warning concentration according to the comparison result;

[0073] If ΔC ≤ ΔC0, the data optimization unit determines that the warning concentration remains unchanged;

[0074] If ΔC > ΔC0, the data optimization unit determines that the warning concentration is reduced to 3% LEL (volume percentage).

[0075] Among them, the warning concentration is 5% LEL, and those skilled in the art can adjust the warning concentration according to specific situations.

[0076] Specifically, when the working mode of the infrared camera is in the second monitoring mode, the data optimization unit compares the concentration change amount in the pipeline with the preset concentration change amount according to the concentration change value detected by the concentration sensor, and the analysis and control unit analyzes the comparison result, so as to optimize the warning concentration according to the comparison result. Further optimizing the warning concentration can accurately and flexibly determine the leakage situation, improve the accuracy and precision of leakage detection, thus effectively preventing the occurrence of accidents and ensuring the safety of personnel and equipment.

[0077] Specifically, the control and adjustment unit in the control module determines the adjustment method for the corresponding monitoring mode according to the service life of the pipeline and the historical leakage rate.

[0078] If both the service life and the historical leakage rate do not exceed the standard, the control and adjustment unit determines not to adjust the corresponding monitoring mode;

[0079] If either the service life or the historical leakage rate exceeds the standard, the control and adjustment unit determines that the corresponding monitoring mode is the first adjustment method.

[0080] If both the service life and the historical leakage rate exceed the standards, the control and adjustment unit determines that the corresponding monitoring method is the second adjustment method.

[0081] Among them, the first adjustment method is to increase the number of pressure sensors by 5 in the first monitoring method, and set the warning concentration to 2% LEL. In the second monitoring method, shorten the time interval for the infrared camera to obtain images and adjust the time interval to 2 s; the second adjustment method is to increase the number of pressure sensors by 10 in the first monitoring method, adjust the warning concentration to 1% LEL, and in the second monitoring method, shorten the time interval for the infrared camera to obtain images and adjust the time interval to 1 s.

[0082] Specifically, the control and adjustment unit in the control module determines the adjustment method for the corresponding monitoring method according to the service life and historical leakage rate of the pipeline. According to the actual situation of the pipeline, by increasing sensors, reducing the warning concentration, and shortening the shooting time interval of the infrared camera, the corresponding monitoring method can be flexibly adjusted to improve the accuracy and adaptability of leakage detection. When both the service life and the historical leakage rate do not exceed the standards, the corresponding monitoring method is not adjusted; when one of the monitoring methods exceeds the standard, the system adopts the first adjustment method, increasing the number of sensors and reducing the warning concentration in the first monitoring method. At the same time, in the second monitoring method, shorten the time interval for the infrared camera to obtain images, which can increase the sensitivity and accuracy of monitoring and improve the detection effect when natural gas leaks. When both monitoring methods exceed the standards, the system adopts the second adjustment method, continues to increase the number of pressure sensors, reduce the warning concentration, and further shorten the time interval for the infrared camera to obtain images in the second monitoring method, improving the efficiency and reliability of leakage detection, thereby effectively preventing accidents and ensuring the safety of personnel and equipment.

[0083] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

[0084] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dynamic gas leakage monitoring system, characterized in that, Including: A data acquisition module, which includes a pressure sensor for collecting the gas pressure inside the natural gas pipeline, a concentration sensor for collecting the gas concentration in the environment where the natural gas pipeline is located, an infrared camera for collecting the infrared image of the natural gas pipeline, and an industrial camera for collecting the structural image of the natural gas pipeline; A data processing module, which is connected to the data acquisition module, includes a data transmission unit for transmitting the data collected by the data acquisition module to the data analysis unit, a data receiving unit for receiving the transmitted data of the data transmission unit, and a data analysis unit for performing real-time processing and analysis on a number of data received by the data receiving unit; A control execution module, which is respectively connected to the data acquisition module and the data processing module. The control execution module includes a control acquisition unit for controlling the data acquisition module to perform acquisition, an analysis control unit for performing control analysis on a number of data received according to the data analysis unit, a welding quality evaluation unit for evaluating the quality of the structural image of the natural gas pipeline, an optimization unit for optimizing the warning concentration, and a control adjustment unit for adjusting the monitoring method; An alarm module, which is connected to the control execution module, includes that when the control execution module detects a gas concentration exceeding the threshold, the alarm module will be triggered to emit sound and light signals to alert the staff; A data recording module, which is connected to the alarm module, is used to record the gas concentration and the gas pressure data of the natural gas pipeline, and store the data on a local device or a remote server; A remote monitoring module: which is respectively connected to the data processing module and the control execution module, includes a remote control unit for allowing users to monitor the gas leakage situation through a remote device, view the gas concentration data in real time, receive alarm information, and perform remote control operations; Among them, the welding quality evaluation unit evaluates the quality of the structural image of the natural gas pipeline so that the data analysis unit determines the monitoring mode of the infrared camera. The data processing module senses the changes in gas concentration and air pressure according to the concentration sensor and the pressure sensor in the data acquisition module. The industrial camera takes the structural image of the natural gas pipeline, and the infrared camera takes the hot area to determine the leakage situation. The data transmission unit transmits the collected data, which is timely processed and analyzed by the data analysis unit, and the warning concentration is optimized by the optimization unit. The control adjustment unit adjusts the corresponding monitoring method. The data recording module records the gas pressure data and performs real-time monitoring through the remote monitoring module; The control acquisition unit in the control execution module controls the industrial camera in the data acquisition module to collect the structural images of the natural gas pipeline for the area to be monitored. The data analysis unit in the data processing module analyzes the structural image data of the natural gas pipeline transmitted by the data transmission unit. The welding quality evaluation unit generates the welding quality evaluation value of the natural gas pipeline in the area to be monitored in the structural image of the natural gas pipeline. The data analysis unit compares the welding quality evaluation value with the preset welding quality evaluation value to determine the monitoring method for the gas leakage process according to the comparison result. If the welding quality evaluation value is greater than the preset welding quality evaluation value, the data analysis unit determines that the monitoring mode of the infrared camera is the first monitoring method.

2. The dynamic gas leakage monitoring system according to claim 1, characterized in that, The first monitoring method satisfies determining the time interval one for obtaining the infrared image of the infrared camera according to the comparison result of the real-time gas pressure in the natural gas pipeline detected by the pressure sensor and the preset gas pressure; If the welding quality evaluation value is less than or equal to the preset welding quality evaluation value, the data analysis unit receives the structural image of the natural gas pipeline transmitted by the data transmission unit and determines that the monitoring mode of the infrared camera is the second monitoring method. The second monitoring method satisfies detecting by combining the infrared camera and the concentration sensor at the same time. The infrared camera monitors at a cycle of time interval two and obtains the monitoring data of the concentration sensor. The warning concentration of the concentration sensor is determined according to the real-time gas concentration in the natural gas pipeline to determine whether there is a leakage.

3. The dynamic gas leakage monitoring system according to claim 2, characterized in that, The data analysis unit calculates the welding quality evaluation value W according to the following formula. Set ， where di represents the surface depression depth value of the i-th solder joint in the welding image, dz is the maximum surface depression depth value in the historical operation data, Aj represents the solder joint area in the j-th historical operation data, and Az represents the maximum solder joint area in the historical operation data.

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