Active matrix type on-line monitoring system for underground gas pipeline leakage

Abstract

The utility model relates to an active matrix type online monitoring system for underground gas pipeline leakage, which comprises a plurality of paths of gas monitoring devices, a multi-channel electromagnetic valve group, a pumping type sampling gas pump, a gas detection device and an integrated control device, each path of gas monitoring device comprises a buried gas collecting pipe, a gas monitoring pipe and a gas production pipe which are buried in a stratum; the multi-channel electromagnetic valve group comprises a plurality of electromagnetic valves, and each electromagnetic valve is correspondingly connected with one gas production pipe; an air inlet of the pumping type sampling air pump is connected with a public output port of the multi-channel electromagnetic valve group; the fuel gas detection device comprises a gas detection cavity and gas detection equipment, the gas detection cavity is communicated with the pumping type sampling gas pump, and the gas detection equipment is used for testing gas to be detected in real time, obtaining detection data of fuel gas concentration, comparing the detection data with a plurality of pre-stored threshold ranges and sending out corresponding alarm signals.

Description

Technical Field

[0001] The utility model relates to the field of instruments and meters, and particularly relates to a monitoring system for gas detection. Background Technique

[0002] In the field of combustion and explosion safety, combustible gases such as CO and CH4, as emerging energy sources, have been widely used in production and life in recent years. However, due to their flammable and explosive characteristics, once the concentration in the air exceeds the explosion limit of the combustible gas, a combustion and explosion accident will occur when encountering an ignition source.

[0003] There are gas pipe networks of gas companies around some sections of the railway, and some gas pipelines are laid under the railway. Once a leakage occurs, it will seriously threaten the safety of the line and train operation. Therefore, it is very necessary to take preventive measures to monitor the gas conditions along the railway.

[0004] Most gas pipelines are buried underground. Gas leakage is not easy to detect and it is difficult to quickly locate the leakage point. To solve this problem, many scholars at home and abroad have carried out research on detection methods. According to different detection objects, they can be divided into two categories, namely direct detection methods and indirect detection methods. Among them, the direct detection method is to detect the substances leaked from the pipeline, mainly including chemical sensing method, optical interference detection method, infrared spectroscopy method, laser detection method, laser telemetry method, etc.; the indirect detection method is to detect the phenomena generated due to gas leakage, mainly including neural network method, pressure point analysis method, negative pressure wave leak detection method, etc. Due to the characteristics of long-distance rapid response, strong positioning, and low cost of the indirect detection method, it is mostly used in the actual detection work of gas pipeline network leakage.

[0005] However, for the large number of existing gas pipelines, large-scale excavation construction and installation of along-line monitoring equipment cannot be carried out. Therefore, only the direct detection method can be used to directly detect the gas concentration leaked from the pipeline.

[0006] Chinese Patent Application No. 201620424309.8 discloses an intelligent induction alarm device for gas pipeline leakage, which includes a controller, a communication module, an alarm module and a gas leakage detection module; the gas leakage detection module is arranged along the gas pipeline, and the gas leakage detection module is also arranged at the interface of the gas pipeline; the alarm module and the communication module are both connected to the controller; the multiple gas leakage detection modules are all communicatively connected to the controller through a bus; the gas leakage detection module includes a processor, a vibration sensor, a positioning unit and a bus interface module; the vibration sensor, the positioning unit and the bus interface module are all connected to the processor; the alarm module is an audible and visual alarm, and the controller is also connected to a display screen for displaying alarm information. However, the intelligent induction alarm device for gas pipeline leakage disclosed in this patent application has the following defects or deficiencies: (1) It is not suitable for monitoring the gas leakage of the gas transmission pipeline under the railway laying track line; (2) The gas leakage detection module is arranged along the gas pipeline, with high construction difficulty and high construction cost; (3) The alarm model is single and cannot alarm the gas leakage situation in different grades; (4) The gas leakage detection module is directly arranged at the interface of the gas pipeline. Due to reasons such as static electricity or short circuit of the detection module, it is extremely easy to ignite the leaked gas and cause the potential danger of gas explosion.

[0007] Therefore, it has become an urgent problem in the industry to provide an active matrix online monitoring system for buried gas pipeline leakage that can real-time monitor the gas leakage situation in the buried gas pipeline at the railway section and can send out alarm signals in time. Utility Model Content

[0008] In view of the above problems, one of the purposes of the present utility model is to provide an active matrix online monitoring system for buried gas pipeline leakage, which can real-time monitor the gas leakage situation in the buried gas pipeline at the railway section and ensure the safety of train operation.

[0009] To achieve the above purpose, the present utility model provides the following technical solutions: The present utility model provides an active matrix online monitoring system for buried gas pipeline leakage, which includes several gas monitoring devices, a multi-channel solenoid valve group, a pump suction sampling air pump, a gas detection device and an integrated control device, wherein,

[0010] The several gas monitoring devices are arranged in a matrix. Each gas monitoring device includes a buried gas collecting pipe buried in the stratum, a gas monitoring pipe communicated with the buried gas collecting pipe, and a gas sampling pipe communicated with the air outlet of the gas monitoring pipe. The bottom of the gas monitoring pipe is placed in the stratum, and the top of the gas monitoring pipe is higher than the stratum;

[0011] The multi-channel solenoid valve group includes a number of solenoid valves, and each solenoid valve is correspondingly connected to one of the gas collecting pipes to control the closing state of the gas collecting pipe;

[0012] The pump suction sampling air pump is provided with an air inlet and an air outlet, and the air inlet is connected to the common output port of the multi-channel solenoid valve group;

[0013] The gas detection device includes a gas detection chamber and a gas detection device communicated with the exhaust port of the gas detection chamber. The air inlet of the gas detection chamber is communicated with the air outlet of the pump suction sampling air pump. The gas detection device is used to perform real-time testing on the gas to be detected reaching the gas detection chamber, obtain the detection data of the gas concentration of the gas to be detected, record and display the detection data, compare the detection data with a number of pre-stored threshold ranges, and when the detection data is within one of the threshold ranges, emit a corresponding alarm signal;

[0014] The integrated control device is communicatively connected to the multi-channel solenoid valve group, the pump suction sampling air pump, and the gas detection device.

[0015] Among them, the collection methods used for the buried gas collecting pipes include, but are not limited to, semi-permeable membranes or semi-permeable tubes.

[0016] Among them, the gas detection chamber serves as a receiving chamber for introducing the gas to be detected, and the detection methods used by the gas detection device include, but are not limited to, catalytic combustion method, electrochemical sensing method, or laser modulation method.

[0017] In some embodiments, it further includes a wireless transmission device, a cloud service device, and a mobile terminal. Among them,

[0018] The wireless transmission device is communicatively connected to the integrated control device and the cloud service device to transmit the detection data to the cloud service device;

[0019] The cloud service device is communicatively connected to the mobile terminal, used to store the detection data, compare the detection data with a number of the pre-stored threshold ranges, when the detection data is within one of the threshold ranges, emit a corresponding early warning signal, and transmit the early warning signal to the mobile terminal.

[0020] In some embodiments, each of the buried gas collecting pipes is arranged parallel to the gas transmission pipe and is not less than 50 centimeters away from the ground surface. Specifically, the distance from the ground includes, but is not limited to, 50 - 60 centimeters, 50 - 70 centimeters, 50 - 80 centimeters, 50 - 90 centimeters, 50 - 100 centimeters, 50 - 110 centimeters, 50 - 120 centimeters, 50 - 130 centimeters, 50 - 140 centimeters, or 50 - 150 centimeters.

[0021] Among them, the buried depth of the gas pipeline along the railway is approximately in the range of 5 to 10 meters. Considering that the buried depth of the gas pipeline is approximately in the range of 5 to 10 meters, as described above, the buried gas collecting pipe should not be less than 50 centimeters away from the surface of the formation. Because, if the buried depth of the buried gas collecting pipe is less than 50 centimeters from the ground surface, it is difficult to achieve rapid collection of leaked gas, and the monitoring and collection process is extremely vulnerable to ground activities.

[0022] In some embodiments, the buried gas collecting pipe and the gas monitoring pipe connected thereto are arranged vertically.

[0023] In some embodiments, at the intersection of the gas transmission pipes, the buried gas pipe is arranged perpendicular to the intersection.

[0024] In some embodiments, the top of each gas monitoring pipe is not less than 50 centimeters away from the surface of the formation. Specifically, the height of the top of each gas monitoring pipe from the surface of the formation includes but is not limited to 50 - 60 centimeters, 50 - 70 centimeters, 50 - 80 centimeters, 50 - 90 centimeters, 50 - 100 centimeters, 50 - 110 centimeters, 50 - 120 centimeters, 50 - 130 centimeters, 50 - 140 centimeters, or 50 - 150 centimeters.

[0025] In some embodiments, the distance between two adjacent gas monitoring pipes is set to 10 - 15 meters.

[0026] In some embodiments, the distance between two adjacent gas monitoring pipes is set to the length of one buried gas collecting pipe.

[0027] In some embodiments, a waterproof, dustproof, and breathable device is covered above the top of the gas monitoring pipe.

[0028] In some embodiments, a waterlogging sensing device is further included between the multi-channel solenoid valve group and the pump suction sampling air pump to ensure that the buried gas collecting pipe is in a dry environment and protect the gas detection device at the same time.

[0029] In some embodiments, a gas path pressure sensing device is further included between the multi-channel solenoid valve group and the pump suction sampling air pump to ensure that the pump suction sampling air pump is in a normal working state.

[0030] In some embodiments, a solar cell device is further included, and the solar cell device is electrically connected to the integrated control device, the gas detection device, the waterlogging sensing device, and the gas path pressure sensing device.

[0031] Due to the adoption of the above technical solutions, the utility model has obtained at least the following technical effects: (1) It does not affect the normal operation of trains on railway lines. By means of the active air intake inspection method, a detection device is used to detect, analyze and alarm the gas concentration at multiple monitoring points, effectively ensuring the safety of train operation; (2) It has a dual alarm mechanism of on-site detection and alarm and remote prompt and early warning, realizing double insurance for gas leakage warning. It can not only avoid the dangerous situation of single warning failure and the occurrence of gas leakage and explosion events, but also monitor the gas leakage situation in real time at two places, namely on-site and remotely; (3) The gas concentration is pre-divided into several different threshold regions and corresponding to several different danger levels. The real-time detected gas concentration is compared with the threshold regions, so as to realize early warnings or alarms at different levels, facilitating the staff to take corresponding measures at different levels; (4) The solar cell device is used to supply power to the whole system, which does not rely on the railway power grid or mains power supply, realizes independent power supply, and ensures the independent and stable operation of the whole system; (5) A waterproof, dustproof and breathable device is covered above the top of the gas monitoring pipe, which can ensure that the detected gas is not affected by external water and dust, and ensure the accuracy of detection data; (6) The gas monitoring pipe is set to expose no less than 50 cm above the ground, so as to avoid the situation that the gas monitoring pipe is flooded by subgrade water accumulation and affects the detection data; (7) The waterlogging sensing device and the gas path pressure sensing device can detect the water content and pressure of the gas inhaled into the gas detection chamber, ensuring the stable operation of the pump suction system; (8) The pump suction type sampling is adopted to avoid the direct contact between the leaked gas and the detection device, and can avoid the potential danger of directly triggering gas explosion due to static electricity or short circuit of the detection device, etc. Description of the Drawings

[0032] Figure 1 Fig. shows the structural schematic diagram of the first embodiment of the active matrix type on-line monitoring system for buried gas pipeline leakage provided by the utility model;

[0033] Figure 2 Fig. shows the structural schematic diagram of the second embodiment of the active matrix type on-line monitoring system for buried gas pipeline leakage provided by the utility model;

[0034] Description of the Reference Numerals

[0035] 001 - Gas transmission pipe, 002 - Buried pipeline land, 101 - First gas monitoring pipe, 102 - Second gas monitoring pipe, 103 - Third gas monitoring pipe, 10n - nth gas monitoring pipe, 111 - First buried gas collecting pipe, 112 - Second buried gas collecting pipe, 113 - Third buried gas collecting pipe, 11n - nth buried gas collecting pipe, 121 - First gas extraction pipe, 122 - Second gas extraction pipe, 123 - Third gas extraction pipe, 12n - nth gas extraction pipe, 131 - Multi-channel solenoid valve group, 141 - Waterlogging sensing device, 151 - Gas path pressure sensing device, 161 - Pump suction sampling air pump, 201 - Gas detection chamber, 202 - Gas detection equipment, 301 - Integrated control device, 401 - Wireless transmission device, 402 - Cloud service device, 403 - Mobile terminal, 501 - Solar cell device. Detailed implementation mode

[0036] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front", "back", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the above components. Without additional statements, the above terms have no special meanings and should not be construed as indicating or implying relative importance.

[0038] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "coupling" 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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] As a non-limiting embodiment, the active matrix type on-line monitoring system for buried gas pipeline leakage of the present utility model includes n gas monitoring devices. Specifically, as Figure 1 shown, it includes a first gas monitoring pipe 101, a second gas monitoring pipe 102, a third gas monitoring pipe 103, ……, an nth gas monitoring pipe 10n, a first buried gas collecting pipe 111, a second buried gas collecting pipe 112, a third buried gas collecting pipe 113, ……, an nth buried gas collecting pipe 11n, a first gas extraction pipe 121, a second gas extraction pipe 122, a third gas extraction pipe 123, ……, an nth gas extraction pipe 12n.

[0040] The first buried gas collecting pipe 111, the second buried gas collecting pipe 112, the third buried gas collecting pipe 113, ……, the nth buried gas collecting pipe 11n are all buried in the buried pipeline land 002, and are arranged parallel to the gas transmission pipe 001, 80 centimeters away from the ground surface.

[0041] The first gas monitoring pipe 101 is communicated with the first buried gas collecting pipe 111, the second gas monitoring pipe 102 is communicated with the second buried gas collecting pipe 112, the third gas monitoring pipe 103 is communicated with the third buried gas collecting pipe 113, the nth gas monitoring pipe 10n is communicated with the nth buried gas collecting pipe 11n. The bottoms of the first gas monitoring pipe 101, the second gas monitoring pipe 102, the third gas monitoring pipe 103 and the nth gas monitoring pipe 10n are all buried in the buried pipeline land 002. The tops of the first gas monitoring pipe 101, the second gas monitoring pipe 102, the third gas monitoring pipe 103 and the nth gas monitoring pipe 10n are about 100 centimeters high from the ground surface, and a waterproof, dustproof and breathable device (not shown in the figure) is covered above the tops, so as to prevent the influence of roadbed water accumulation and environmental moisture and dust on the monitored gas. The first gas extraction pipe 121 is communicated with the first gas monitoring pipe 101, the second gas extraction pipe 122 is communicated with the second gas monitoring pipe 102, the third gas extraction pipe 123 is communicated with the third gas monitoring pipe 103, and the nth gas extraction pipe 12n is communicated with the nth gas monitoring pipe 10n. In this non-limiting embodiment, the gas monitoring pipe is thicker than the gas collection pipe, which is convenient for collecting gas.

[0042] The multi-channel solenoid valve group 131 includes n solenoid valves (not shown in the figure). The first solenoid valve is connected to the first gas extraction pipe 121 to control the closing state of the first gas extraction pipe 121. The second solenoid valve is connected to the second gas extraction pipe 122, the third solenoid valve is connected to the third gas extraction pipe 123, and the nth solenoid valve is connected to the nth gas extraction pipe 12n to control the closing states of the corresponding gas extraction pipes respectively.

[0043] The pump suction type sampling air pump 161 is provided with an air inlet (not labeled in the figure) and an air outlet (not labeled in the figure). The air inlet is connected to the common output port of the multi-channel solenoid valve group 131.

[0044] The gas detection device includes a gas detection chamber 201 and gas detection equipment 202. The gas detection equipment 202 conducts real-time testing on the gas to be detected reaching the gas detection chamber 201, obtains the detection data of the gas concentration in the gas to be detected, records and displays the detection data, and gives an alarm when the gas concentration exceeds 15% of the lowest explosion limit concentration LEL. The detection data is compared with several pre-stored threshold ranges, and when the detection data is within one of the threshold ranges, a corresponding alarm signal is issued. For example, when the gas concentration is between 15% and 50% LEL, a blue alarm is given and the voice broadcast of the blue alarm can be accompanied; when the gas concentration is between 50% and 75% LEL, an orange alarm is given and the voice broadcast of the orange alarm can be accompanied; when the gas concentration is greater than 75% LEL, a red alarm is given and the voice broadcast of the red alarm can be accompanied.

[0045] The integrated control device 301 is communicatively connected to the multi-channel solenoid valve group 131, the pump suction sampling air pump 161, and the gas detection equipment 202.

[0046] As another non-limiting implementation manner, as Figure 1 shown, it further includes a wireless transmission device 401, a cloud service device 402, a mobile terminal 403, and a solar cell device 501. Among them, the wireless transmission device 401 is communicatively connected to the integrated control device 301 and the cloud service device 402, so as to transmit the detection data obtained by the gas detection equipment 202 to the cloud service device 402, store the detection data, and compare the detection data with several pre-stored threshold ranges. When the detection data is within one of the threshold ranges, a corresponding early warning signal is issued and the early warning signal is transmitted to the mobile terminal 403. Similar to the alarm of the gas detection equipment 202, the cloud service device 402 also conducts gradient hierarchical early warning according to the gas explosion limit concentration (LEL). When the gas concentration exceeds 15% LEL (the lowest explosion limit concentration), an early warning is given. When the gas concentration is between 15% and 50% LEL, a blue early warning is given and the voice broadcast of the blue early warning can be accompanied; when the gas concentration is between 50% and 75% LEL, an orange early warning is given and the voice broadcast of the orange early warning can be accompanied; when the gas concentration is greater than 75% LEL, a red early warning is given and the voice broadcast of the red early warning can be accompanied.

[0047] The solar cell device 501 is electrically connected to the multi-channel solenoid valve group 131, the integrated control device 301, and the gas detection equipment 202, so as to ensure the independent and stable operation of the whole set of equipment.

[0048] Thus, during the operation of the entire system, first, the battery device 501 supplies power to the integrated control device 301 and the gas detection device 202. The integrated control device 301 and the gas detection device 202 start the self-check process and prepare to start working. Then, the integrated control device 301 communicates with the multi-channel solenoid valve group 131 to transmit instructions, opens the first solenoid valve connected to the first gas sampling pipe 121, and keeps other solenoid valves closed. Subsequently, the integrated control device 301 communicates with the pump suction type sampling air pump 161 to transmit instructions, turns on the pump suction type sampling air pump 161, and maintains it for a period of time. Since the buried pipeline land 002 is always filled with gas, if the gas leaks, it will diffuse into the buried gas collecting pipe and the gas monitoring pipe. Under the pumping action of the pump suction type sampling air pump 161, the combustible gas leaked from the buried gas pipeline 001 into the buried pipeline land 002 collected by the first buried gas collecting pipe 111 and the combustible gas diffused into the first gas monitoring pipe 101 can be inhaled through the first gas sampling pipe 121 and the gas in the gas detection chamber 201 can be updated. Then, the gas detection device 202 conducts real-time testing on the gas reaching the gas detection chamber 201, records, displays, and judges its concentration. When the gas concentration exceeds the alarm limit, it will emit a sound and light alarm. The detection data obtained by the gas detection device 202 is communicated through the integrated control device 301, and the detection data of the gas detection device 202 is sent to the cloud service device 402 by using the wireless transmission device 401. Data storage, comparison, and judgment are carried out on the cloud service device 402. When the gas concentration exceeds the alarm limit, an alarm signal is immediately sent to the designated mobile terminal 403, and the alarm level is classified according to the concentration magnitude. After the gas in the first gas detection pipe 101 is detected, the first gas solenoid valve is closed, then the second solenoid valve connected to the second gas sampling pipe 122 is opened, and then the above operation steps are repeated to complete the detection of the gas concentration in the second gas monitoring pipe 102. In this way, the detection of the gas concentration in all gas monitoring pipes from the third gas monitoring pipe 103 to the nth gas monitoring pipe 10n will be completed in sequence. After the gas concentration detection in all gas sampling pipes is completed, the next round of gas concentration monitoring starts from the first gas monitoring pipe 101 again, and so on, realizing the on-line monitoring of gas leakage in the gas pipeline.

[0049] As another non-limiting embodiment, as Figure 2 shown, it further includes a waterlogging sensing device 141 and a gas path pressure sensing device 151 arranged between the multi-channel solenoid valve group 131 and the pump suction type sampling air pump 161. Since it is difficult to achieve gas sampling and impossible to conduct gas leakage monitoring when the sampling head (i.e., the top of the gas monitoring pipe) is flooded by water, the waterlogging sensing device 141 can ensure that the gas monitoring pipe is in a dry environment for sampling and monitoring. The gas path pressure sensing device 151 can monitor whether the pump suction type sampling air pump 161 is in a normal working state.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An active matrix type on-line monitoring system for leakage of underground gas pipelines, characterized in that It includes several gas monitoring devices, a multi-channel solenoid valve group, a pump suction sampling air pump, a gas detection device, and an integrated control device. Among them, The several gas monitoring devices are arranged in a matrix. Each gas monitoring device includes a buried gas collecting pipe buried in the formation, a gas monitoring pipe communicated with the buried gas collecting pipe, and a gas sampling pipe communicated with the outlet of the gas monitoring pipe. The bottom of the gas monitoring pipe is placed in the formation, and the top of the gas monitoring pipe is higher than the formation; The multi-channel solenoid valve group includes several solenoid valves. Each solenoid valve is correspondingly connected to one of the gas sampling pipes to control the closing state of the gas sampling pipe; The pump suction sampling air pump is provided with an air inlet and an air outlet. The air inlet is connected to the common output port of the multi-channel solenoid valve group; The gas detection device includes a gas detection chamber and a gas detection device communicated with the exhaust port of the gas detection chamber. The air inlet of the gas detection chamber is connected to the air outlet of the pump suction sampling air pump. The gas detection device is used to perform real-time testing on the gas to be tested reaching the gas detection chamber, obtain the detection data of the gas concentration in the gas to be tested, record and display the detection data, compare the detection data with several pre-stored threshold ranges, and when the detection data is within one of the threshold ranges, send out a corresponding alarm signal; The integrated control device is communicatively connected to the multi-channel solenoid valve group, the pump suction sampling air pump, and the gas detection device.

2. The active matrix type on-line monitoring system for buried gas pipeline leakage according to claim 1, wherein It further includes a wireless transmission device, a cloud service device, and a mobile terminal. Among them, The wireless transmission device is communicatively connected to the integrated control device and the cloud service device to transmit the detection data to the cloud service device; The cloud service device is communicatively connected to the mobile terminal, used to store the detection data, compare the detection data with several pre-stored threshold ranges, when the detection data is within one of the threshold ranges, send out a corresponding early warning signal, and transmit the early warning signal to the mobile terminal.

3. The active matrix type on-line monitoring system for leakage of underground gas pipelines according to claim 2, wherein Each of the buried gas collecting pipes is arranged parallel to the gas transmission pipe and is not less than 50 centimeters away from the surface of the formation.

4. The active matrix type on-line monitoring system for buried gas pipeline leakage according to claim 3, wherein The distance between two adjacent gas monitoring pipes is set to be 10 to 15 meters.

5. The active matrix type on-line monitoring system for leakage of buried gas pipelines according to claim 3, characterized in that, The top of each gas monitoring pipe is not less than 50 centimeters away from the surface of the formation.

6. The active matrix type on-line monitoring system for buried gas pipeline leakage according to claim 3, characterized in that, A waterproof, dustproof, and breathable device is covered above the top of the gas monitoring pipe.

7. The active matrix type on-line monitoring system for buried gas pipeline leakage according to claim 2, characterized in that, It further includes a waterlogging sensing device arranged between the multi-channel solenoid valve group and the pump suction sampling air pump.

8. The active matrix type on-line monitoring system for leakage of underground gas pipelines according to claim 7, characterized in that, It further includes a gas path pressure sensing device arranged between the multi-channel solenoid valve group and the pump suction sampling air pump.

9. The active matrix type on-line monitoring system for buried gas pipeline leakage according to claim 8, characterized in that, It further includes a solar cell device. The solar cell device is electrically connected to the integrated control device, the gas detection device, the waterlogging sensing device, and the gas path pressure sensing device.

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