Gas pipeline safety monitoring system and method

Abstract

The invention relates to the technical field of gas pipeline monitoring, and discloses a gas pipeline safety monitoring system and method. The method comprises the following steps: installing a data acquisition module at a pipeline connection and setting a monitoring period and a monitoring threshold; the data acquisition module continuously acquires a deformation amount at the pipeline connection within the monitoring period, and determines whether there is a seismic source based on the discrete degree of change of an analog signal of the acquired deformation amount, and if there is a seismic source, continues to acquire the deformation amount until the seismic source is eliminated; if there is no seismic source, acquires the current deformation amount and determines whether it exceeds the monitoring threshold; if it does not exceed the monitoring threshold, determines that no gas leakage occurs at the pipeline connection; if it exceeds the monitoring threshold, determines that a gas leakage occurs at the pipeline connection, and at this time forms a control instruction and sends it to a pipeline opening and closing control terminal to control the corresponding pipeline to be closed, so as to predict the gas leakage at the pipeline connection in advance, eliminate the system misjudgment caused by the seismic source, improve the monitoring accuracy, and ensure the safety of the gas supply pipeline and users.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipeline monitoring, and in particular to a gas pipeline safety monitoring system and method. Background Art

[0002] With the rapid development of China's economy, the consumption of natural gas has increased year by year, and its proportion in the energy consumption of industry, commerce and urban residents has increased significantly. However, gas is a flammable, explosive and toxic dangerous good. The safe operation of the gas pipeline network is related to the safety of social production and people's lives and property. The factors that cause risk problems are distributed in all aspects of the enterprise operation process. In particular, the city pipeline network is getting older year by year, and the leakage and explosion accidents caused by the barbaric construction of third-party construction units are common. Therefore, how to effectively control and eliminate risks is a problem that enterprises have always faced. Good monitoring of gas pipelines is an important prerequisite for ensuring the safety of gas use.

[0003] However, most existing gas pipelines are connected by flanges. When encountering earthquake disasters or other sources, the joints are prone to radial deformation, which causes gas leakage at the pipeline joints and triggers explosion accidents. Existing monitoring facilities cannot effectively monitor and control the joints. Therefore, a gas pipeline safety monitoring system and method is provided for the construction and development of urban gas pipeline networks to ensure the safety of gas supply pipelines and users. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a gas pipeline safety monitoring system and method to solve the technical problems mentioned in the prior art.

[0005] A gas pipeline safety monitoring method, the method comprising the following steps:

[0006] Install several groups of data acquisition modules at each pipeline connection, and set the monitoring cycle and monitoring threshold of the data acquisition modules;

[0007] The data acquisition module continuously acquires the deformation amount of the corresponding pipeline connection during the monitoring period, and determines whether there is a seismic source based on the discrete degree of the obtained analog signal change of the deformation amount, and determines the location of the seismic source based on the deformation amount obtained at each pipeline connection;

[0008] If the degree of discreteness of the simulated signal change of the deformation variable tends to be concentrated, there is a seismic source, and the deformation variable is obtained by continuously cycling for several monitoring cycles until the seismic source is eliminated; if the deformation variable obtained at one of the deformation variables obtained at each pipeline connection has a transmission attenuation trend toward the two connected sides, the pipeline connection is the seismic source location;

[0009] If the degree of discreteness of the simulated signal change of the deformation variable tends to diverge, there is no earthquake source, and then the current deformation variable is obtained and it is determined whether it exceeds the monitoring threshold;

[0010] If the deformation amount currently obtained does not exceed the monitoring threshold, it is determined that no gas leakage occurs at the pipeline connection, and the next monitoring cycle is entered;

[0011] If the deformation amount currently obtained exceeds the monitoring threshold, it is determined that a gas leak occurs at the pipeline connection. At this time, a control instruction is generated and sent to the pipeline opening and closing control terminal to control the corresponding pipeline to close.

[0012] Optionally, the deformation variable is a displacement and / or a strain variable, wherein the method for the data acquisition module to continuously acquire the deformation variable within the monitoring period is:

[0013] The strain gauge sensor is used to detect the magnitude of the strain force generated in the radial direction at the pipe connection to obtain the strain amount;

[0014] The displacement sensor detects the displacement of the pipe connection along the axial direction to obtain the displacement amount.

[0015] Optionally, when determining that a gas leak occurs at a pipeline connection, continuously obtaining a plurality of groups of absolute values ​​of differences between the deformation amounts and the monitoring threshold, and determining whether the plurality of groups of absolute values ​​of the differences are all greater than 0;

[0016] If the absolute values ​​of the differences in several groups are all greater than 0, an alarm instruction is generated and sent to the pipeline opening and closing control terminal and the alarm, so that the pipeline opening and closing control terminal controls the pipeline to be in a closed state and controls the alarm to sound an alarm;

[0017] If the absolute value of any group of the difference values ​​is equal to 0, a normal operation instruction is generated and sent to the pipeline opening and closing control terminal to control the pipeline to be in an open state.

[0018] Optionally, if the earthquake source is detected in two consecutive monitoring cycles, the current deformation amount is obtained, and it is determined whether the currently obtained deformation amount exceeds the monitoring threshold;

[0019] If the deformation amount currently obtained exceeds the monitoring threshold, it is determined that a gas leak occurs at the pipeline connection;

[0020] If the deformation amount currently acquired does not exceed the monitoring threshold, it is determined that no gas leakage occurs at the pipeline connection.

[0021] Optionally, four groups of the data acquisition modules are evenly installed at the flange connection of two adjacent pipelines along the axial direction thereof, and the maximum group of deformation variables detected by the four groups of the data acquisition modules is used as the current deformation variable.

[0022] A gas pipeline safety monitoring system is applied to the above-mentioned method, and the system comprises:

[0023] Data acquisition module, used to detect the deformation of the pipeline connection;

[0024] A setting module, connected to the data acquisition module, used to set a monitoring period and a monitoring threshold of the data acquisition module;

[0025] A determination module, connected to the data acquisition module and the setting module, determines whether there is a seismic source based on the discrete degree of the analog signal change of the deformation variable obtained by the data acquisition module; when the deformation variable obtained at one of the pipeline connections has a transmission attenuation trend to the two connected sides, the pipeline connection is the seismic source location; and compares the currently obtained deformation variable with the monitoring threshold to determine whether a gas leak occurs at the pipeline connection;

[0026] The control module is connected to the determination module and is used to generate a control instruction when a gas leak occurs at the pipeline connection and send it to the pipeline opening and closing control terminal to control the corresponding pipeline to close.

[0027] Optionally, the control instruction has:

[0028] An alarm instruction, wherein when the absolute values ​​of the differences between the deformation amounts and the monitoring threshold values ​​continuously obtained for a plurality of groups are all greater than 0, the pipeline opening and closing control terminal controls the pipeline to be in a closed state and controls the alarm to sound an alarm;

[0029] The normal operation instruction is that when any one of the absolute values ​​of the differences between the deformation amounts and the monitoring threshold values ​​obtained continuously is equal to 0, the pipeline opening and closing control terminal controls the pipeline to be in an open state.

[0030] Optionally, the data acquisition module is installed in a mounting hole opened at the flange connection of two adjacent pipelines and along the axial direction thereof, the two ends of the mounting hole respectively penetrate two flanges, and the two ends of the mounting hole are located on opposite sides of the two flanges and limit grooves are respectively provided, and the data acquisition module has:

[0031] A plurality of center tubes, wherein the center tubes are located in the mounting holes, one end of the center tubes extends to one of the limiting grooves and a fixing portion is installed therein, and the other end of the center tubes extends to another limiting groove and a blocking cover is installed therein;

[0032] A plurality of strain gauge sensors, wherein the strain gauge sensors are mounted on the outer circumference of the central tube, the strain gauge sensors are closely fitted to the inner wall of the mounting hole, and the strain gauge sensors are used to detect the strain force signal generated in the radial direction between the two flanges;

[0033] A plurality of displacement sensors, each of which is mounted on one end of the fixing portion close to the central tube, and is used to detect a displacement signal generated between the fixing portion and the plugging cover along the axial direction;

[0034] A processor, wherein a first detection array and a second detection array are disposed in the processor;

[0035] The first detection array comprises:

[0036] A plurality of first detectors, each of which has a first code set according to an installation position of a strain gauge sensor, and the first detector is connected to a corresponding strain gauge sensor according to the first code to obtain a strain force signal of the strain gauge sensor;

[0037] A first processing unit is connected to a plurality of first detectors, receives the strain force signal, determines the magnitude of the strain force generated along the radial direction between the two flanges according to the strain force signal, and determines the concentrated direction of the strain force according to the strain force magnitude and the first code;

[0038] The second detection array comprises:

[0039] A plurality of second detectors, each of which has a second code set according to the layout position of the displacement sensor, and the second detector is connected to the corresponding displacement sensor according to the second code to obtain a displacement signal of the displacement sensor;

[0040] The second processing unit is connected to the plurality of first detectors, receives the displacement signal, determines the displacement magnitude between the fixing unit and the blocking cover along the axial direction through the displacement signal, and determines the concentrated orientation of the displacement offset through the displacement magnitude and the second code.

[0041] Optionally, the processor is further provided with:

[0042] a first comparison unit, connected to the first processing unit provided in the first detection array, for obtaining a first average value of the strain force generated in the radial direction between the two flanges obtained at each pipeline connection, and obtaining a maximum value among the multiple first average values ​​based on comparison of the obtained first average values, and deriving a first code corresponding to the maximum value among the first average values;

[0043] The first judgment unit extracts the first code corresponding to the maximum value in the first average value, and determines through the first code whether there is an attenuation trend in the first average value of the strain force generated radially between the two flanges corresponding to both sides from the maximum value in the first average value. If so, the installation position corresponding to the first code is the source position.

[0044] Optionally, the processor is further provided with:

[0045] a second comparison unit, connected to the second processing unit provided in the second detection array, for obtaining a second average value of the displacement between the fixing portion and the plugging cover along the axial direction obtained at each pipeline connection, and obtaining a maximum value among the plurality of second average values ​​based on comparison of the obtained plurality of second average values, and deriving a second code corresponding to the maximum value among the second average values;

[0046] The second judgment unit extracts the second code corresponding to the maximum value in the second average value, and determines through the second code whether there is an attenuation trend in the second average value of the displacement size generated between the fixed part and the blocking cover along the axial direction corresponding to the maximum value in the second average value on both sides; if so, the vibration level of the earthquake source is determined according to the attenuation trend of the second average value.

[0047] The beneficial effects that the present invention can produce include:

[0048] A gas pipeline safety monitoring system and method provided by the present invention monitors the sealing performance of the gas pipeline in real time by acquiring the deformation amount at the pipeline connection, thereby ensuring the early prediction of gas leakage at the pipeline connection, and judging whether there is a seismic source based on the discrete degree of change of the analog signal of the acquired deformation amount, so as to eliminate the temporary deformation amount at the pipeline connection caused by the seismic source, thereby improving the monitoring accuracy and ensuring the safety of the gas supply pipeline and users. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of a flow chart of a gas pipeline safety monitoring method of the present invention;

[0050] Figure 2 A schematic diagram of the framework principle of a gas pipeline safety monitoring system of the present invention;

[0051] Figure 3 This is a structural schematic diagram of a data acquisition module of a gas pipeline safety monitoring system of the present invention;

[0052] Figure 4 For the present invention Figure 3 Cross-sectional view after assembly with flange;

[0053] Figure 5For the present invention Figure 4 The front view of the flange;

[0054] In the figure: 1. data acquisition module, 2. setting module, 3. determination module, 4. control module, 5. pipeline opening and closing control terminal, 6. alarm, 7. flange, 8. mounting hole, 9. limit groove, 10. center tube, 11. fixing part, 12. plugging cover, 13. strain gauge sensor, 14. displacement sensor. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] See also Figure 1 As shown, the present invention provides a gas pipeline safety monitoring method, which includes the following steps: installing several groups of data acquisition modules 1 at each pipeline connection, and setting the monitoring period and monitoring threshold of the data acquisition module 1; the data acquisition module 1 continuously obtains the deformation of the corresponding pipeline connection during the monitoring period, and judges whether there is a seismic source based on the discrete degree of the analog signal change of the acquired deformation variable and judges the location of the seismic source based on the deformation variable obtained at each pipeline connection; if the discrete degree of the analog signal change of the deformation variable tends to be concentrated, there is a seismic source, and continues to cycle for several monitoring periods to obtain the deformation variable until the seismic source is eliminated; if based on When one of the deformation variables obtained at each pipeline connection has a transmission attenuation trend to the two connected sides, the pipeline connection is the source position; if the discrete degree of the analog signal change of the deformation variable tends to diverge, there is no source, and then the current deformation variable is obtained and it is determined whether it exceeds the monitoring threshold; if the deformation variable currently obtained does not exceed the monitoring threshold, it is determined that there is no gas leakage at the pipeline connection, and the next monitoring cycle is entered; if the deformation variable currently obtained exceeds the monitoring threshold, it is determined that there is a gas leakage at the pipeline connection, and a control instruction is formed at this time and sent to the pipeline opening and closing control terminal 5 to control the corresponding pipeline to close. In the above, it should be noted that the monitoring threshold is the initial value of the data acquisition module 1 when the natural gas is connected after the pipeline is assembled. By obtaining the deformation variable at the pipeline connection, the sealing performance of the gas pipeline is monitored in real time, so as to ensure the advance prediction of the gas leakage at the pipeline connection, and to determine whether there is a source based on the discrete degree of the analog signal change of the deformation variable obtained, so as to eliminate the temporary deformation variable at the pipeline connection caused by the source, which causes system misjudgment, improve the monitoring accuracy, and ensure the safety of the gas supply pipeline and users.

[0057] Further, the deformation is a displacement and / or strain. Specifically, the method for the data acquisition module 1 to continuously obtain the deformation during the monitoring period is: the strain gauge sensor 13 is used to detect the strain force generated in the radial direction of the pipeline connection to obtain the strain, and then the difference between the strain and the initial value is used to determine whether the pipeline connection has radial misalignment. If radial misalignment occurs, it indicates that there is a risk of gas leakage; the displacement sensor 14 is used to detect the displacement generated in the pipeline connection along the axial direction to obtain the displacement, and then the difference between the displacement and the initial value is used to determine whether the pipeline connection has axial displacement. If axial displacement occurs, it indicates that there is a risk of gas leakage; in the above, by combining axial displacement monitoring and radial strain monitoring, it can ensure accurate monitoring of whether the sealing performance of the pipeline connection is damaged, so as to achieve early warning of gas leakage.

[0058] In the above, when it is determined that a gas leak occurs at the pipeline connection, the absolute values ​​of the differences between several groups of deformation variables and the monitoring threshold are continuously obtained, and it is determined whether the absolute values ​​of the differences are all greater than 0; if the absolute values ​​of the differences are all greater than 0, an alarm instruction is generated and sent to the pipeline opening and closing control terminal 5 and the alarm 6, so that the pipeline opening and closing control terminal 5 controls the pipeline to be in a closed state, and controls the alarm 6 to sound an alarm; if any group of the absolute values ​​of the differences is equal to 0, a normal operation instruction is generated and sent to the pipeline opening and closing control terminal 5 to control the pipeline to be in an open state, thereby further eliminating the system's misjudgment and ensuring the normal operation of the pipeline.

[0059] In the above, if the presence of an earthquake source is detected within two consecutive monitoring cycles, the current deformation variable is obtained, and it is determined whether the currently obtained deformation variable exceeds the monitoring threshold; if the currently obtained deformation variable exceeds the monitoring threshold, it is determined that a gas leak has occurred at the pipeline connection; if the currently obtained deformation variable does not exceed the monitoring threshold, it is determined that no gas leak has occurred at the pipeline connection; thereby preventing the deformation variable at the pipeline connection from changing in real time when a gas leak occurs in the pipeline, causing the system to misjudge the deformation at the pipeline connection caused by the earthquake source and fail to close the pipeline in time, thereby further improving the monitoring accuracy, avoiding interference from external factors, and ensuring that the corresponding pipeline can be closed in time when a gas pipeline leaks, thereby achieving accurate monitoring of the gas pipeline.

[0060] Furthermore, four groups of data acquisition modules 1 are evenly installed along the axial direction of the flange connection of two adjacent pipelines, and the largest group of deformation variables detected by the four groups of data acquisition modules 1 is used as the current deformation variable, thereby avoiding missed detection when local gas leakage occurs at the flange connection due to damage to the sealing layer.

[0061] See also Figure 2-Figure 5As shown, the present invention also provides a gas pipeline safety monitoring system, which is applied to the above method. The system includes a data acquisition module 1, a setting module 2, a determination module 3 and a control module 4, wherein the data acquisition module 1 is used to detect the deformation amount at the pipeline connection; the setting module 2 is connected to the data acquisition module 1, and is used to set the monitoring period and monitoring threshold of the data acquisition module 1; the determination module 3 is connected to the data acquisition module 1 and the setting module 2, and the determination module 3 determines whether there is a seismic source based on the discrete degree of the analog signal change of the deformation amount obtained by the data acquisition module 1; when the deformation amount obtained at one of the deformation amounts obtained at each pipeline connection has a transmission attenuation trend to the connected two sides, the pipeline connection is the seismic source location; and the size of the deformation amount currently obtained is compared with the monitoring threshold to determine whether a gas leak occurs at the pipeline connection; the control module 4 is connected to the determination module 3, and is used to form a control instruction when a gas leak occurs at the pipeline connection and send it to the pipeline opening and closing control terminal 5 to control the corresponding pipeline to close.

[0062] Furthermore, the control instructions include alarm instructions and normal operation instructions. The alarm instructions are that when the absolute values ​​of the differences between several groups of deformation variables obtained continuously and the monitoring threshold are all greater than 0, the pipeline opening and closing control terminal 5 controls the pipeline to be in a closed state, and controls the alarm 6 to sound an alarm; the normal operation instructions are that when any one of the absolute values ​​of the differences between several groups of deformation variables obtained continuously and the monitoring threshold is equal to 0, the pipeline opening and closing control terminal 5 controls the pipeline to be in an open state.

[0063] Furthermore, the data acquisition module 1 is installed in a mounting hole 8 opened at the flange connection of two adjacent pipelines and along the axial direction thereof, and the two ends of the mounting hole 8 respectively penetrate two flanges 7, wherein the mounting hole 8 on the flange 7 is located between two adjacent bolt holes, so that after the flanges 7 of the two adjacent pipelines are assembled and qualified by bolts, the data acquisition module 1 is debugged and installed in the mounting hole 8, and the two ends of the mounting hole 8 are located on the opposite sides of the two flanges 7 and limit grooves 9 are respectively opened to facilitate fixing the data acquisition module 1. The data acquisition module 1 has a plurality of central tubes 10, a plurality of strain gauge sensors 13, and a plurality of displacement sensors 1 4 and a processor, a central tube 10 is located in the mounting hole 8, one end of the central tube 10 extends into one of the limiting grooves 9 and is integrally formed with a fixing portion 11, the fixing portion 11 is fixedly installed in the limiting groove 9 by a plurality of sets of screws, so as to realize the positioning and installation of the strain gauge sensor 13 and the displacement sensor 14, the other end of the central tube 10 extends into another limiting groove 9 and is installed with a plug cover 12; the strain gauge sensor 13 is installed on the outer periphery of the central tube 10, the strain gauge sensor 13 is tightly fitted with the inner wall of the mounting hole 8, and the strain gauge sensor 13 is used to detect the strain force signal generated in the radial direction between the two flanges 7; the displacement sensor 14 is installed The displacement sensor 14 is installed at one end of the fixing part 11 close to the central tube 10, and is used to detect the displacement signal generated between the fixing part 11 and the plugging cover 12 along the axial direction; the processor is provided with a first detection array and a second detection array; the first detection array includes: a plurality of first detectors, each of which has a first code set according to the installation position of the strain gauge sensor, and the first detector is connected to the corresponding strain gauge sensor according to the first code, and is used to obtain the strain force signal of the strain gauge sensor; the first processing part is connected to the plurality of first detectors, receives the strain force signal, and determines the magnitude of the strain force generated in the radial direction between the two flanges 7 through the strain force signal, and determines the concentrated direction of the strain force through the strain force magnitude and the first code; the second detection array includes: a plurality of second detectors, each of which has a second code set according to the layout position of the displacement sensor 14, and the second detector is connected to the corresponding displacement sensor 14 according to the second code, and is used to obtain the displacement signal of the displacement sensor 14; the second processing part is connected to the plurality of first detectors, receives the displacement signal, and determines the magnitude of the displacement generated between the fixing part 11 and the plugging cover 12 along the axial direction through the displacement signal, and determines the concentrated direction of the displacement offset through the displacement magnitude and the second code.

[0064] It should be noted that the strain gauge sensor 13 is a resistance strain sensor. When any flange 7 is radially misaligned, the strain gauge sensor 13 will be squeezed, causing the resistance strain gauge to deform and change its resistance. At this time, the bridge balance in the measurement circuit is destroyed, and an output voltage is generated, thereby detecting the strain generated at the pipeline connection. The displacement sensor 14 is a laser displacement sensor, because the laser has the excellent characteristic of good straightness, and can accurately detect the displacement generated at the pipeline connection.

[0065] Furthermore, the processor is also provided with a first comparison unit and a first judgment unit. The first comparison unit is connected to the first processing unit provided with the first detection array, and is used to obtain the first average value of the strain force generated radially between the two flanges 7 obtained at each pipeline connection, and obtain the maximum value among the multiple first average values ​​based on the comparison obtained, and derive the first code corresponding to the maximum value among the first average values; the first judgment unit derives the first code corresponding to the maximum value among the first average values, and determines whether there is an attenuation trend in the first average value of the strain force generated radially between the two flanges 7 corresponding to both sides from the maximum value in the first average value through the first code. If so, the installation position corresponding to the first code is the source position.

[0066] Furthermore, the processor is also provided with a second comparison unit and a second judgment unit, and the second comparison unit is connected to the second processing unit provided in the second detection array, and is used to obtain the second average value of the displacement size generated between the fixing part 11 and the plugging cover 12 along the axial direction obtained at each pipeline connection, and compare the multiple second average values ​​obtained to obtain the maximum value among the multiple second average values, and derive the second code corresponding to the maximum value among the second average values; the second judgment unit derives the second code corresponding to the maximum value among the second average values, and determines through the second code whether there is an attenuation trend in the second average value of the displacement size generated between the fixing part 11 and the plugging cover 12 along the axial direction corresponding to the maximum value in the second average value to the two sides. If so, the vibration level of the earthquake source is judged according to the attenuation trend of the second average value.

[0067] In the above, when any point of the pipeline encounters external vibration, it will cause strain force to be generated in the radial direction between the two flanges 7 at the pipeline connection and displacement between the fixing part 11 and the plug cover 12 in the axial direction. When the vibration direction of the earthquake source is different, the force points and force directions of the pipeline will be different. When the earthquake source is used as the starting point, the radial force obtained at the adjacent pipeline connection will be attenuated when it is transmitted along the pipeline. According to this logic, the position of the earthquake source can be determined. At the same time, when the vibration direction of the earthquake source is different, it also causes the strain force generated in the radial direction to be different in magnitude in the circumferential direction of the flange 7. According to the magnitude of the circumferential strain force, it can be determined in which direction the force points of the pipeline are roughly concentrated. Similarly, the vibration level of the earthquake source can be determined according to the displacement magnitude between the fixing part 11 and the plug cover 12 in the axial direction.

Claims

1. A gas pipeline safety monitoring system, characterized in that: The system comprises: A data acquisition module (1) is used to detect the deformation of the pipe connection; A setting module (2), connected to the data acquisition module (1), and used to set a monitoring period and a monitoring threshold of the data acquisition module (1); A determination module (3) is connected to the data acquisition module (1) and the setting module (2), and determines whether there is a seismic source based on the degree of discreteness of the analog signal change of the deformation variable obtained by the data acquisition module (1); when the deformation variable obtained at one of the pipeline connections has a transmission attenuation trend toward the two connected sides, the pipeline connection is the seismic source location; and determines whether a gas leak occurs at the pipeline connection by comparing the deformation variable currently obtained with the monitoring threshold; A control module (4) connected to the determination module (3) is used to generate a control instruction when a gas leak occurs at the pipeline connection and send it to the pipeline opening and closing control terminal (5) to control the corresponding pipeline to close; The data acquisition module (1) comprises a plurality of strain gauge sensors (13) and a processor, wherein a first detection array is arranged in the processor; The first detection array comprises: A plurality of first detectors, each of which has a first code set according to an installation position of a strain gauge sensor (13), and the first detector is connected to a corresponding strain gauge sensor (13) according to the first code to obtain a strain force signal of the strain gauge sensor (13); A first processing unit connected to a plurality of first detectors, receiving the strain force signal, determining the magnitude of the strain force generated in the radial direction between the two flanges (7) through the strain force signal, and determining the concentrated direction of the strain force through the strain force magnitude and the first code; The data acquisition module (1) is installed in a mounting hole (8) provided at the flange connection of two adjacent pipelines and along the axial direction thereof, the two ends of the mounting hole (8) respectively penetrate the two flanges (7), and the two ends of the mounting hole (8) are located on opposite sides of the two flanges (7) and are provided with limiting grooves (9), respectively. The data acquisition module (1) comprises: A plurality of center tubes (10), wherein the center tubes (10) are located in the mounting holes (8), one end of the center tube (10) extends to one of the limiting grooves (9) and is provided with a fixing portion (11), and the other end of the center tube (10) extends to another limiting groove (9) and is provided with a blocking cover (12); The strain gauge sensor (13) is mounted on the outer circumference of the central tube (10), the strain gauge sensor (13) is tightly fitted to the inner wall of the mounting hole (8), and the strain gauge sensor (13) is used to detect a strain force signal generated in a radial direction between the two flanges (7); A plurality of displacement sensors (14), wherein the displacement sensors (14) are mounted on one end of the fixing portion (11) close to the central tube (10), and the displacement sensors (14) are used to detect a displacement signal generated between the fixing portion (11) and the plugging cover (12) along an axial direction.

2. A gas pipeline safety monitoring system according to claim 1, characterized in that: The control instructions have: An alarm instruction, wherein when the absolute values ​​of the differences between the deformation amounts and the monitoring threshold values ​​continuously obtained are all greater than 0, the pipeline opening and closing control terminal (5) controls the pipeline to be in a closed state and controls the alarm (6) to sound an alarm; A normal operation instruction, wherein the normal operation instruction is that when any one of the absolute values ​​of the difference between the deformation variables and the monitoring threshold values ​​obtained continuously is equal to 0, the pipeline opening and closing control terminal (5) controls the pipeline to be in an open state.

3. A gas pipeline safety monitoring system according to claim 1, characterized in that: The processor is also provided with a second detection array, and the second detection array includes: a plurality of second detectors, each second detector having a second code set according to the layout position of the displacement sensor (14), and the second detector being connected to the corresponding displacement sensor (14) according to the second code, for obtaining a displacement signal of the displacement sensor (14); The second processing unit is connected to the plurality of first detectors, receives the displacement signal, determines the magnitude of the displacement between the fixing unit (11) and the blocking cover (12) along the axial direction through the displacement signal, and determines the concentrated orientation of the displacement offset through the displacement magnitude and the second code.

4. A gas pipeline safety monitoring system according to claim 3, characterized in that: The processor is also provided with: a first comparison unit, connected to a first processing unit provided in the first detection array, for obtaining a first average value of the strain force generated in the radial direction between the two flanges (7) obtained at each pipeline connection, and obtaining a maximum value among the plurality of first average values ​​based on a comparison of the obtained first average values, and deriving a first code corresponding to the maximum value among the first average values; The first judgment unit extracts a first code corresponding to a maximum value in the first average value, and determines through the first code whether a first average value of the strain force generated radially between the two flanges (7) corresponding to the maximum value in the first average value has an attenuation trend. If so, the installation position corresponding to the first code is the earthquake source position.

5. A gas pipeline safety monitoring system according to claim 4, characterized in that: The processor is also provided with: a second comparison unit connected to a second processing unit provided in the second detection array, and used to obtain a second average value of the displacement between the fixing portion (11) and the plugging cover (12) obtained at each pipe connection point along the axial direction, and to obtain a maximum value among the plurality of second average values ​​based on a comparison of the obtained second average values, and to derive a second code corresponding to the maximum value among the second average values; The second judgment unit extracts a second code corresponding to the maximum value in the second average value, and uses the second code to determine whether a second average value of the displacement generated along the axial direction between the fixed part (11) and the blocking cover (12) corresponding to both sides from the maximum value in the second average value has an attenuation trend. If so, the vibration level of the earthquake source is determined based on the attenuation trend of the second average value.

6. A gas pipeline safety monitoring method, the method being applied to the system according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: Installing a plurality of groups of data acquisition modules (1) at each pipeline connection, and setting a monitoring cycle and a monitoring threshold of the data acquisition modules (1); The data acquisition module (1) continuously acquires the deformation amount of the corresponding pipeline connection during the monitoring period, and determines whether there is a seismic source based on the discrete degree of the analog signal change of the acquired deformation amount, and determines the location of the seismic source based on the deformation amount obtained at each pipeline connection; If the degree of discreteness of the simulated signal change of the deformation variable tends to be concentrated, there is a seismic source, and the deformation variable is obtained by continuously cycling for several monitoring cycles until the seismic source is eliminated; if the deformation variable obtained at one of the deformation variables obtained at each pipeline connection has a transmission attenuation trend toward the two connected sides, the pipeline connection is the seismic source location; If the degree of discreteness of the simulated signal change of the deformation variable tends to diverge, there is no earthquake source, and then the current deformation variable is obtained and it is determined whether it exceeds the monitoring threshold; If the deformation amount currently obtained does not exceed the monitoring threshold, it is determined that no gas leakage occurs at the pipeline connection, and the next monitoring cycle is entered; If the deformation amount currently obtained exceeds the monitoring threshold, it is determined that a gas leak occurs at the pipeline connection. At this time, a control instruction is generated and sent to the pipeline opening and closing control terminal (5) to control the corresponding pipeline to be closed.

7. A gas pipeline safety monitoring method according to claim 6, characterized in that: The deformation variable is a displacement variable and / or a strain variable, wherein the method by which the data acquisition module (1) continuously acquires the deformation variable during the monitoring period is: Detecting the magnitude of the strain force generated in the radial direction at the pipe connection by means of a strain gauge sensor (13) to obtain the strain amount; The displacement sensor (14) detects the magnitude of the displacement of the pipe connection along the axial direction to obtain the displacement amount.

8. A gas pipeline safety monitoring method according to claim 6, characterized in that: When determining that a gas leak occurs at a pipeline connection, continuously obtaining the absolute values ​​of the differences between several groups of the deformation amounts and the monitoring threshold, and determining whether the absolute values ​​of the differences in several groups are all greater than 0; If the absolute values ​​of the differences in the plurality of groups are all greater than 0, an alarm instruction is generated and sent to the pipeline opening and closing control terminal (5) and the alarm (6), so that the pipeline opening and closing control terminal (5) controls the pipeline to be in a closed state, and controls the alarm (6) to sound an alarm; If the absolute value of any one of the difference values ​​is equal to 0, a normal operation instruction is generated and sent to the pipeline opening and closing control terminal (5) to control the pipeline to be in an open state.

9. A gas pipeline safety monitoring method according to claim 6, characterized in that: If the earthquake source is detected in two consecutive monitoring cycles, the current deformation amount is obtained, and it is determined whether the currently obtained deformation amount exceeds the monitoring threshold; If the deformation amount currently obtained exceeds the monitoring threshold, it is determined that a gas leak occurs at the pipeline connection; If the deformation amount currently acquired does not exceed the monitoring threshold, it is determined that no gas leakage occurs at the pipeline connection.

10. A gas pipeline safety monitoring method according to claim 6, characterized in that: Four groups of data acquisition modules (1) are evenly installed at the flange connection of two adjacent pipelines along the axial direction thereof, and the largest group of deformation variables detected by the four groups of data acquisition modules (1) is used as the current deformation variable.

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