A high-pressure gas leakage monitoring system based on data analysis

Abstract

The application discloses a high-pressure gas leakage monitoring system based on data analysis and relates to the technical field of gas leakage monitoring.The application comprises a master control module, a flow acquisition module, a leakage preliminary positioning module, a sound pressure level acquisition module, a calculation module and a leakage fine positioning module.The flow acquisition module is used for acquiring pipeline gas flow information data based on flow sensors at each joint of the pipeline and outputting the data to the leakage positioning module.The leakage preliminary positioning module is used for preliminarily analyzing each section of the pipeline according to the received pipeline gas flow information data and obtaining the number of the leakage pipeline.The sound pressure level acquisition module is used for acquiring sound pressure level data of the leakage position of the leakage pipeline based on sound pressure sensors at the two ends of the leakage pipeline and outputting the data to the calculation module.The application can quickly monitor gas leakage, can position multiple pipeline leakages and does not affect each other when monitoring different leakage pipelines.

Description

Technical Field

[0001] This invention belongs to the field of gas leak monitoring technology, and in particular relates to a high-pressure gas leak monitoring system based on data analysis. Background Technology

[0002] When monitoring gas leaks in high-pressure gas supply pipelines, point-type combustible gas monitoring and alarm systems are typically used. These systems primarily rely on the principle of gas diffusion to trigger an alarm. When gas diffuses to a specific location, an alarm is automatically triggered. However, this monitoring and alarm speed is very slow and is also affected by wind speed and the external environment. Acoustic emission technology, based on the speed of sound wave propagation, can quickly locate leaks in high-pressure gas supply pipelines. When gas is pressurized and transported through pipelines, if a leak occurs, the gas inside the pipeline will erupt from the leak point due to the pressure difference. This creates a high-pressure shock wave at the leak point, which generates sound waves through friction and vibration against the pipe wall. High-sensitivity sensors collect these vibration signals, enabling real-time monitoring of pipeline leaks.

[0003] Current high-pressure gas leak detection technologies, whether point-type combustible gas monitoring and alarm systems or acoustic emission technology, have certain shortcomings. When faced with complex high-pressure gas supply pipelines, they cannot quickly and accurately detect and locate the leak point. Therefore, we propose a high-pressure gas leak detection system based on data analysis. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure gas leak monitoring system based on data analysis, which solves the problem that existing systems cannot quickly and accurately monitor and locate leak points when dealing with complex high-pressure gas supply pipelines.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention is a high-pressure gas leak monitoring system based on data analysis, including a main control module, a flow acquisition module, a leak initial location module, a sound pressure level acquisition module, a calculation module, and a leak fine location module;

[0007] Main control module: Used to issue start and stop commands to each module of the system, and to communicate with each module via serial port protocol;

[0008] Flow acquisition module: used to collect gas flow information data from pipeline based on flow sensors at each joint of the pipeline, and output it to the leak location module;

[0009] Leakage initial location module: Based on the received gas flow information data of each pipeline, perform preliminary analysis on each pipeline section and obtain the leaking pipeline number;

[0010] Sound pressure level acquisition module: used to acquire sound pressure level data at the leak point of the leaking pipe based on the sound pressure sensors at both ends of the leaking pipe, and output it to the calculation module;

[0011] Calculation module: Calculates the gas leakage per unit time from the leaking pipe using the gas flow data at the leaking pipe, and substitutes it into the pre-established ultrasonic gas leakage monitoring model to calculate the sound pressure level at a vertical distance of 1m from the leaking pipe.

[0012] Leakage Detailing Module: This module uses a sound pressure sensor at one end of the leaking pipe (either end or end) to collect sound pressure level data (L) at the leak location. 首 / 尾 Substituting the sound pressure level data L1, located 1m perpendicular to the leak hole in the leaking pipe, into equation (1) yields the straight-line distances between the two ends of the leaking pipe and the leak hole:

[0013] L 首 / 尾 =L1-20logA (1)

[0014] Where A is the distance from one end of the leaking pipe to the leak point.

[0015] Preferably, the high-pressure gas is transported inside several pipes after being assembled, with each pair of adjacent pipes connected and sealed by a joint. Each joint is equipped with a flow sensor inside and a sound pressure sensor outside the joint, and each pipe is a straight pipe.

[0016] Preferably, the leak initial location module divides the pipeline into n sections based on the flow sensors installed inside each pipe joint, and marks each flow sensor as X. n Every preset time interval t, the system acquires the corresponding pipeline flow information collected by all flow sensors for their respective pipeline locations. The pipeline flow information of all flow sensors at each time interval is sorted and classified according to time and flow sensor name to form a flow information table. The flow information table is analyzed to obtain the abnormal flow information of each flow sensor in a certain time period as the basis for the occurrence of leakage in that section of the pipeline.

[0017] Preferably, the pipeline gas flow information data refers to the gas flow rate measured by the flow sensor at the pipeline joint per unit time, and the flow rate of each flow sensor at a certain time interval t. n The abnormal flow information refers to the flow sensor X n Compared with the previous time period t n-1 Discrepancies exist in the internal flow information, specifically within the time period t. n With time period t n-1 The difference between the measured flow rate data is the flow sensor X. nWith flow sensor X n-1 The amount of gas leaked per unit time in the pipeline between them.

[0018] Preferably, the sound pressure level acquisition module acquires two sets of sound pressure level data, namely the data from the flow sensor X at the beginning of the leakage pipe. n-1 The sound pressure level L from the corresponding sound pressure sensor to the leakage point 首 and the flow sensor X at the tail end of the leak pipe n The sound pressure level L from the corresponding sound pressure sensor to the leak point 尾 The distance from the beginning of the pipeline to the leak point and the distance from the end of the pipeline to the leak point are calculated by formula (1), and the sum of the two distances is calculated to determine whether it is consistent with the length of the pipeline, so as to judge the accuracy of the leak point location.

[0019] Preferably, the ultrasonic monitoring model for gas leakage in the calculation module includes the following: Since gas leakage through a small hole follows subcritical flow characteristics, the gas leakage velocity formula is as shown in equation (2):

[0020]

[0021] Where V is the gas velocity when passing through the leak hole, p 管内 The pressure inside the pipe is T1, the absolute temperature is σ = p0 / p, p0 is the absolute pressure of the ambient atmosphere, R is the gas constant, and K is 2.646.

[0022] Based on the gas velocity V as it passes through the leak orifice and the gas leakage rate Q per unit time in the pipeline, the mechanical average area s of the leak orifice is calculated:

[0023]

[0024] Based on the mechanical average area s of the leakage hole, the mechanical average diameter D of the leakage hole is calculated as follows:

[0025]

[0026] The sound pressure level data L1 at a vertical distance of 1m from the leaking pipe pore was obtained using the mechanical average diameter calculation formula for the leaking pore:

[0027]

[0028] Where D0 is 1 mm, p 驻压 ρ is the pressure at the leak hole, and p is the actual gas leak pressure value measured by the detector. The detector is installed at both ends of the pipeline to detect the gas pressure inside the pipeline.

[0029] Preferably, the monitoring system further includes an alarm module, which is used to issue different levels of alarms based on the amount of gas leakage when a gas leak is detected in a certain section of the pipeline; if the amount of gas leakage is less than the preset target warning gas leakage amount, a first warning is issued; if the amount of gas leakage is greater than or equal to the preset target warning gas leakage amount, a second warning is issued.

[0030] Preferably, the monitoring system further includes a data storage module for comprehensively storing all data collected by the system, data tags, identified leakage data markers, and historical leakage data of each pipeline for subsequent querying and analysis.

[0031] The present invention has the following beneficial effects:

[0032] 1. This invention divides the gas leak monitoring process into two parts: a leak initial location module and a leak fine location module. First, the leak initial location module monitors the entire pipeline system to identify the specific pipeline where the leak has occurred. Then, the leak fine location module calculates the specific leak location of the leaking pipeline. Based on these two modules, gas leaks can be monitored quickly, and multiple pipeline leaks can be located simultaneously without affecting each other when monitoring different leaking pipelines.

[0033] 2. This invention uses a flow acquisition module to periodically collect gas flow data from pipelines via flow sensors located at each pipeline joint. Every preset time interval t, it acquires the corresponding pipeline flow information collected by all flow sensors for their respective pipeline locations. The flow information from all flow sensors at each time interval is then organized and categorized according to time and flow sensor name to form a flow information table. By comparing the flow information from each flow sensor at different time intervals within the flow information table, if a pipeline leaks, the flow information data within that pipeline will inevitably change. By finding the first pipeline where the flow information data changes, the leaking pipeline can be located. This method is simple and effective, allowing for intuitive location and screening of leaking pipelines.

[0034] 3. This invention, by setting up a sound pressure acquisition module, once a pipe leak is determined, activates two sound pressure sensors at the beginning and end of the pipe to collect sound pressure level data at the leak point. This acquires sound pressure level data from both the beginning and end of the pipe to the leak point. Then, a calculation module calculates the sound pressure level at a distance of 1m vertically from the leak hole. As is generally known, the greater the distance from the sound source, the lower the sound pressure level. Therefore, the calculation formula can accurately calculate the distance from both ends of the pipe to the leak hole. The sum of these two distances is then compared with the pipe length; if they match, the location is accurate. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 The present invention provides a system block diagram of a high-pressure gas leak monitoring system based on data analysis. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] See Figure 1 The present invention is a high-pressure gas leak monitoring system based on data analysis, including a main control module, a flow acquisition module, a leak initial location module, a sound pressure level acquisition module, a calculation module, and a leak fine location module;

[0041] Main control module: Used to issue start and stop commands to each module of the system, and to communicate with each module via serial port protocol;

[0042] Flow acquisition module: used to collect gas flow information data of the pipeline based on the flow sensors at each joint of the pipeline, and output it to the leak initial location module;

[0043] Leakage initial location module: Based on the received gas flow information data of each pipeline, perform preliminary analysis on each pipeline section and obtain the leaking pipeline number;

[0044] Sound pressure level acquisition module: used to acquire sound pressure level data at the leak point of the leaking pipe based on the sound pressure sensors at both ends of the leaking pipe, and output it to the calculation module;

[0045] Calculation module: Calculates the gas leakage per unit time from the leaking pipe using the gas flow data at the leaking pipe, and substitutes it into the pre-established ultrasonic gas leakage monitoring model to calculate the sound pressure level at a vertical distance of 1m from the leaking pipe.

[0046] Leakage Detailing Module: This module uses a sound pressure sensor at one end of the leaking pipe (either end or end) to collect sound pressure level data (L) at the leak location. 首 / 尾 Substituting the sound pressure level data L1, located 1m perpendicular to the leak hole in the leaking pipe, into equation (1) yields the straight-line distances between the two ends of the leaking pipe and the leak hole:

[0047] L 首 / 尾 =L1-20logA (1)

[0048] Where A is the distance from one end of the leaking pipe to the leak point.

[0049] The high-pressure gas is transported inside several pipes after being assembled. Each pair of adjacent pipes is connected and sealed by a joint. Each joint is equipped with a flow sensor inside and a sound pressure sensor outside. Each pipe is a straight pipe.

[0050] The leak initial location module divides the pipeline into n sections based on the flow sensors installed inside each pipe joint, and marks each flow sensor as X. n Every preset time interval t, the system acquires the corresponding pipeline flow information collected by all flow sensors for their respective pipeline locations. The pipeline flow information of all flow sensors at each time interval is sorted and classified according to time and flow sensor name to form a flow information table. The flow information table is analyzed to obtain the abnormal flow information of each flow sensor in a certain time period as the basis for the occurrence of leakage in that section of the pipeline.

[0051] Among them, pipeline gas flow information data refers to the gas flow rate measured by the flow sensor at the pipe joint per unit time, and the flow rate of each flow sensor at a certain time interval t. n The abnormal flow information refers to the flow sensor X n Compared with the previous time period t n-1 Discrepancies exist in the internal flow information, specifically within the time period t.n With time period t n-1 The difference between the measured flow rate data is the flow sensor X. n With flow sensor X n-1 The amount of gas leaked per unit time in the pipeline between them.

[0052] The sound pressure level acquisition module collects two sets of sound pressure level data, namely the X data from the flow sensor at the beginning of the leak pipe. n-1 The sound pressure level L from the corresponding sound pressure sensor to the leakage point 首 and the flow sensor X at the tail end of the leak pipe n The sound pressure level L from the corresponding sound pressure sensor to the leak point 尾 The distance from the beginning of the pipeline to the leak point and the distance from the end of the pipeline to the leak point are calculated by formula (1), and the sum of the two distances is calculated to determine whether it is consistent with the length of the pipeline, so as to judge the accuracy of the leak point location.

[0053] The calculation module includes the following ultrasonic monitoring model for gas leakage: Since gas leakage through a small hole follows subcritical flow characteristics, the gas leakage velocity formula is shown in equation (2):

[0054]

[0055] Where V is the gas velocity when passing through the leak hole, p 管内 The pressure inside the pipe is T1, the absolute temperature is σ = p0 / p, p0 is the absolute pressure of the ambient atmosphere, R is the gas constant, and K is 2.646.

[0056] Based on the gas velocity V as it passes through the leak orifice and the gas leakage rate Q per unit time in the pipeline, the mechanical average area s of the leak orifice is calculated:

[0057]

[0058] Based on the mechanical average area s of the leakage hole, the mechanical average diameter D of the leakage hole is calculated as follows:

[0059]

[0060] The sound pressure level data L1 at a vertical distance of 1m from the leaking pipe pore was obtained using the mechanical average diameter calculation formula for the leaking pore:

[0061]

[0062] Where D0 is 1 mm, p 驻压 ρ is the pressure at the leak hole, and p is the actual gas leak pressure value measured by the detector. The detector is installed at both ends of the pipeline to detect the gas pressure inside the pipeline.

[0063] The monitoring system also includes an alarm module, which is used to issue different levels of alarms based on the amount of gas leakage when a gas leak is detected in a certain section of the pipeline. If the amount of gas leakage is less than the preset target warning amount, a first warning is issued; if the amount of gas leakage is greater than or equal to the preset target warning amount, a second warning is issued.

[0064] The monitoring system also includes a data storage module, which is used to comprehensively save all data collected by the system, data tags, leak data indicators, and historical leak data of each pipeline for subsequent query and analysis.

[0065] The working principle of this invention is as follows:

[0066] S1. The main control module sends a gas flow information data acquisition command to the flow acquisition module every preset time t. The flow sensor installed inside each pipe joint collects the gas flow information data of the pipeline and outputs the gas flow data to the leak initial location module.

[0067] S2. The initial leak location module performs preliminary analysis on the gas flow information data received from each pipeline section. Based on the flow sensors installed inside each pipeline joint, the pipeline is divided into n sections. The pipeline flow information of all flow sensors at each time is sorted and classified according to time and flow sensor name to form a flow information table. The flow information table is analyzed to obtain the abnormal flow information of each flow sensor in a certain time period as the basis for the leak in that section of the pipeline. This completes the preliminary location of the leaking pipeline, enabling the location of the leaking pipeline among several pipelines.

[0068] S3. Activate the sound pressure sensors at both ends of the leaking pipe to collect sound pressure level data at the leak point. The sound pressure level acquisition module collects two sets of sound pressure level data, namely, the data from the flow sensor X at the leaking pipe's head end. n-1 The sound pressure level L from the corresponding sound pressure sensor to the leakage point 首 and the flow sensor X at the tail end of the leak pipe n The sound pressure level L from the corresponding sound pressure sensor to the leak point 尾 And output it to the computing module;

[0069] S4. Calculate the gas leakage rate per unit time of the leaking pipe through the gas flow data at the leaking pipe, and input it into the pre-established ultrasonic gas leakage monitoring model to calculate the sound pressure level at a vertical distance of 1m from the leaking pipe.

[0070] S5. Calculate the distance from the beginning of the pipeline to the leak point and the distance from the end of the pipeline to the leak point using formula (1), and calculate whether the sum of the two distances is consistent with the length of the pipeline to determine the accuracy of the leak point location; finally, determine the precise location of the pipeline leak point.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure gas leak monitoring system based on data analysis, characterized in that: It includes a main control module, a flow acquisition module, a leak initial location module, a sound pressure level acquisition module, a calculation module, and a leak fine location module; Main control module: Used to issue start and stop commands to each module of the system, and to communicate with each module via serial port protocol; Flow acquisition module: used to collect gas flow information data of the pipeline based on the flow sensors at each joint of the pipeline, and output it to the leak initial location module; Leakage initial location module: Based on the received gas flow information data of each pipeline, perform preliminary analysis on each pipeline section and obtain the leaking pipeline number; Sound pressure level acquisition module: used to acquire sound pressure level data at the leak point of the leaking pipe based on sound pressure sensors at both ends of the leaking pipe, and output it to the calculation module; Calculation module: Calculates the gas leakage per unit time from the leaking pipe using the gas flow data at the leaking pipe, and substitutes it into the pre-established ultrasonic gas leakage monitoring model to calculate the sound pressure level at a vertical distance of 1m from the leaking pipe. The calculation module includes the following regarding the ultrasonic monitoring model for gas leakage: Since gas leakage through a small hole follows subcritical flow characteristics, the gas leakage velocity formula is shown in equation (2): （2） Where V is the gas velocity when it passes through the leak hole. The pressure inside the pipeline. Absolute temperature , Where is the absolute pressure of ambient atmosphere, R is the gas constant, and K is 2.646; Based on the gas velocity V as it passes through the leak orifice and the gas leakage rate Q per unit time in the pipeline, the mechanical average area s of the leak orifice is calculated: （3）； Based on the mechanical average area s of the leakage hole, the mechanical average diameter D of the leakage hole is calculated as follows: （4）； The sound pressure level data at a vertical distance of 1m from the leak pore in the leaking pipe was obtained using the mechanical average diameter calculation formula. : （5） in, Take 1mm, The actual gas leakage pressure value is obtained by measuring the detector, which is installed at both ends of the pipeline to detect the gas pressure value inside the pipeline; Leakage Detailing Module: This module uses a sound pressure sensor at one end of the leaking pipe to collect sound pressure level data at the leak point. Sound pressure level data at a distance of 1m perpendicular to the leak hole in the leaking pipe Substituting into equation (1), the straight-line distances between the two ends of the leaking pipe and the leak hole are calculated: （1） Where A is the distance between one end of the leaking pipeline and the leak point.

2. The high-pressure gas leak monitoring system based on data analysis according to claim 1, characterized in that, The high-pressure gas is transported inside several pipes after being assembled. Each pair of adjacent pipes is connected and sealed by a joint. Each joint is equipped with a flow sensor inside and a sound pressure sensor outside. Each pipe is a straight pipe.

3. The high-pressure gas leak monitoring system based on data analysis according to claim 2, characterized in that, The leak initial location module divides the pipeline into n sections based on the flow sensors installed inside each pipe joint, and marks each flow sensor as... Every preset time interval t, the system acquires the corresponding pipeline flow information collected by all flow sensors for their respective pipeline locations. The pipeline flow information of all flow sensors at each time interval is sorted and classified according to time and flow sensor name to form a flow information table. The flow information table is analyzed to obtain the abnormal flow information of each flow sensor in a certain time period as the basis for the occurrence of leakage in that section of the pipeline.

4. The high-pressure gas leak monitoring system based on data analysis according to claim 3, characterized in that, The gas flow information data in the pipeline refers to the gas flow rate measured by the flow sensor at the pipe joint per unit time, and the flow rate of each flow sensor within a certain time period. The abnormal flow information refers to the flow sensor Compared with the previous time period Discrepancies exist in internal traffic information, specifically within time periods. With time period The difference between the measured flow information data is the flow sensor With flow sensor The amount of gas leaked per unit time in the pipeline between them.

5. A high-pressure gas leak monitoring system based on data analysis according to claim 4, characterized in that, The sound pressure level acquisition module collects two sets of sound pressure level data, namely, the flow sensor at the beginning of the leaking pipe. The sound pressure level from the corresponding sound pressure sensor to the leak point and the flow sensor at the end of the leaking pipe. The sound pressure level from the corresponding sound pressure sensor to the leak point The distance from the beginning of the pipeline to the leak point and the distance from the end of the pipeline to the leak point are calculated by formula (1), and the sum of the two distances is calculated to determine whether it is consistent with the length of the pipeline, so as to judge the accuracy of the leak point location.

6. A high-pressure gas leak monitoring system based on data analysis according to claim 5, characterized in that, The monitoring system also includes an alarm module, which is used to issue different levels of alarms based on the amount of gas leakage when a gas leak is detected in a certain section of the pipeline; if the amount of gas leakage is less than the preset target warning gas leakage amount, a first warning is issued; if the amount of gas leakage is greater than or equal to the preset target warning gas leakage amount, a second warning is issued.

7. A high-pressure gas leak monitoring system based on data analysis according to claim 6, characterized in that, The monitoring system also includes a data storage module, which is used to comprehensively save all data collected by the system, data tags, leak data indicators, and historical leak data of each pipeline for subsequent query and analysis.

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