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

Abstract

The invention relates to an active matrix type on-line monitoring system for underground gas pipeline leakage and a monitoring method for gas leakage, the monitoring system 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, the gas monitoring devices are arranged in a matrix mode, 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; 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 present invention relates to the field of instruments and meters, and in particular to a monitoring system for gas detection, and more specifically to an active matrix online monitoring system for underground gas pipeline leakage and a monitoring method for gas leakage. Background Art

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

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

[0004] Most gas pipelines are buried underground, and gas leaks are not easy to detect, and it is difficult to quickly locate the leak point. In order to solve this problem, domestic and foreign scholars have conducted many researches on detection methods. According to the different detection objects, they can be divided into two categories, namely direct detection method and indirect detection method. Among them, the direct detection method is to detect the substances leaking from the pipeline, mainly including chemical sensing method, optical interference detection method, infrared spectroscopy method, laser detection method and laser telemetry method; the indirect detection method is to detect the phenomena caused by gas leakage, mainly including neural network method, pressure point analysis method and negative pressure wave leak detection method. Because the indirect detection method has the characteristics of long-distance rapid response, strong positioning and low cost, it is mostly used in the actual detection of gas pipeline network leaks.

[0005] However, for a large number of gas pipelines that have been built, it is impossible to carry out large-scale excavation construction and install monitoring equipment along the line. Therefore, the only way is to use the direct detection method to directly detect the concentration of gas leaking from the pipeline.

[0006] Chinese patent application 201620424309.8 discloses an intelligent sensing alarm device for gas pipeline leakage, including 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 sensing alarm device for gas pipeline leakage disclosed in the patent application has the following defects or deficiencies: (1) it is not suitable for monitoring gas leakage in the gas transmission pipeline under the railway track; (2) the gas leakage detection module is arranged along the gas pipeline, which is difficult to construct and has high construction cost; (3) the alarm model is single and cannot provide graded alarm for gas leakage; (4) the gas leakage detection module is directly arranged at the interface of the gas pipeline. Due to static electricity or circuit short circuit of the detection module, it is very easy to ignite the leaked gas, resulting in the potential risk of gas explosion.

[0007] Therefore, it is an urgent problem to provide an active matrix online monitoring system for underground gas pipeline leakage that can monitor the gas leakage in the underground gas pipeline at the railway section in real time and send out alarm signals in time. Summary of the invention

[0008] In view of the above problems, one of the purposes of the present invention is to provide an active matrix online monitoring system for underground gas pipeline leakage, which can monitor the gas leakage in the underground gas pipeline at the railway section in real time to ensure the safety of driving.

[0009] To achieve the above objectives, the present invention provides the following technical solutions: The first objective of the present invention is to provide an active matrix online monitoring system for underground gas pipeline leakage, comprising a plurality of gas monitoring devices, a multi-channel solenoid valve group, a pump-suction sampling gas pump, a gas detection device and an integrated control device, wherein:

[0010] The plurality of gas monitoring devices are arranged in a matrix, each gas monitoring device comprising an underground gas collecting pipe buried in the formation, a gas monitoring pipe connected to the underground gas collecting pipe, and a gas sampling pipe connected to the gas 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;

[0011] The multi-channel solenoid valve group includes a plurality of solenoid valves, each of which is correspondingly connected to one of the gas collection pipes to control the closed state of the gas collection 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 comprises a gas detection chamber and a gas detection device connected to 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 gas pump, the gas detection device is used to perform real-time testing on the gas to be tested that reaches the gas detection chamber, obtain the detection data of the gas concentration in the gas to be tested, and record and display the detection data, compare the detection data with several pre-stored threshold ranges, and send a corresponding alarm signal when the detection data is within one of the threshold ranges;

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

[0015] Wherein, the collection method used by the buried gas collecting pipe includes but is not limited to a semi-permeable membrane or a semi-permeable pipe.

[0016] The gas detection chamber is used as a containing chamber for introducing the gas to be detected, and the detection method used by the gas detection device includes but is not limited to a catalytic combustion method, an electrochemical sensing method or a laser modulation method.

[0017] In some embodiments, a wireless transmission device, a cloud service device and a mobile terminal are also included, wherein:

[0018] The wireless transmission device is communicatively connected with 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 with the mobile terminal, and is used to 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 warning signal is issued and the warning signal is transmitted 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 cm away from the surface of the formation. Specifically, the distance from the ground includes but is not limited to 50-60 cm, 50-70 cm, 50-80 cm, 50-90 cm, 50-100 cm, 50-110 cm, 50-120 cm, 50-130 cm, 50-140 cm or 50-150 cm.

[0021] Among them, the buried depth of the gas pipeline along the railway is about 5 meters to 10 meters. Considering that the buried depth of the gas pipeline is about 5 meters to 10 meters, as mentioned above, the buried gas collecting pipe should not be less than 50 centimeters from the surface of the formation, because if the buried gas collecting pipe is buried less than 50 centimeters in the ground, it is difficult to quickly collect the leaked gas, and the monitoring and collection process is easily affected by 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 tube is not less than 50 cm from the surface of the formation. Specifically, the height of the top of each gas monitoring tube from the surface of the formation includes but is not limited to 50-60 cm, 50-70 cm, 50-80 cm, 50-90 cm, 50-100 cm, 50-110 cm, 50-120 cm, 50-130 cm, 50-140 cm or 50-150 cm.

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

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

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

[0028] In some embodiments, a flooding sensor device is also 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.

[0029] In some embodiments, an air 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 normal working condition.

[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 equipment, the flooding sensor device and the gas path pressure sensor device.

[0031] The second object of the present invention is to provide a method for monitoring gas leakage using the active matrix online monitoring system for underground gas pipeline leakage, comprising the following steps:

[0032] (1) The integrated control device transmits instructions to the multi-channel solenoid valve group to open a solenoid valve installed on the gas collection pipe and keep the other solenoid valves in a closed state;

[0033] (2) The integrated control device transmits instructions to the pump-suction sampling air pump to start the pump-suction sampling air pump and maintain the set time;

[0034] (3) The gas detection equipment performs real-time testing on the gas reaching the gas detection chamber, and records, displays, and determines its concentration. When the gas concentration exceeds the alarm limit, a sound and light alarm is issued;

[0035] (4) The wireless transmission device sends the detection data obtained by the gas detection device to the cloud service device, which stores, compares and judges the data. When the gas concentration exceeds the alarm limit, an alarm signal is sent to the mobile terminal; and

[0036] (5) Repeat steps (1) to (4) until all gas concentrations in the gas production pipes are tested, and then perform cyclic monitoring.

[0037] In some embodiments, in step (4), when the gas concentration exceeds the alarm limit, the alarm level is classified according to the size of the gas concentration.

[0038] In some embodiments, before step (1), the method further includes: the battery device supplies power to the integrated control device and the gas detection device, and the integrated control device and the gas detection device perform self-test.

[0039] By adopting the above technical scheme, the present invention has at least achieved the following technical effects: (1) It does not affect the normal operation of railway line trains. Through active air suction inspection, one detection device is used to detect, analyze and alarm the gas concentration at multiple monitoring points, thereby effectively ensuring the safety of driving; (2) It has a dual alarm mechanism of on-site detection alarm and remote prompt warning, realizing double insurance for gas leakage warning, which can not only avoid the dangerous situation of single warning failure and gas leakage and explosion incidents, but also monitor the gas leakage situation in real time in two places, namely on-site and remote; (3) The gas concentration is pre-divided into several different threshold areas, and corresponds to several different danger levels. The real-time detected gas concentration is compared with the threshold area, so as to realize different levels of warning or alarm, which is convenient for the staff to take different levels of response measures. ; (4) A solar cell device is used to power the entire system, which does not rely on the railway power grid or city power supply, and realizes independent power supply to ensure the independent and stable operation of the entire system; (5) The top of the gas monitoring tube is covered with a waterproof, dustproof and breathable device to ensure that the detected gas will not be affected by external water and dust, thereby ensuring the accuracy of the detection data; (6) The gas monitoring tube is set to be exposed to the ground at a height of not less than 50 cm, so as to avoid the occurrence of water accumulation on the roadbed submerging the gas monitoring tube and affecting the detection data; (7) The water flooding sensor device and the gas path pressure sensor device can perform water content detection and pressure detection on the gas inhaled into the gas detection chamber to ensure the stable operation of the pump suction system; (8) Pump suction sampling is adopted to avoid direct contact between the leaking gas and the detection equipment, which can avoid the potential danger of gas explosion directly caused by static electricity or short circuit of the detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A structural schematic diagram of a first embodiment of an active matrix-type online monitoring system for underground gas pipeline leakage provided by the present invention is shown;

[0041] Figure 2 A structural schematic diagram of a second embodiment of the active matrix online monitoring system for underground gas pipeline leakage provided by the present invention is shown;

[0042] Figure 3 A flow chart of the monitoring method provided by the present invention is shown;

[0043] Description of reference numerals:

[0044] 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 collection pipe, 122-second gas collection pipe, 123-third gas collection pipe, 12n-nth gas collection pipe, 131-multi-channel solenoid valve group, 141-flooding sensor device, 151-gas path pressure sensor 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 DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 making creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "positive", "negative", "front", "back", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc., are used to define components, only for the convenience of distinguishing the above components, and unless otherwise stated, the above terms have no special meanings and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] As a non-limiting embodiment, the active matrix online monitoring system for underground gas pipeline leakage of the present invention includes n-way gas monitoring devices, specifically, as follows Figure 1As shown, it includes a first gas monitoring tube 101, a second gas monitoring tube 102, a third gas monitoring tube 103, ..., an nth gas monitoring tube 10n, a first underground gas collecting pipe 111, a second underground gas collecting pipe 112, a third underground gas collecting pipe 113, ..., an nth underground gas collecting pipe 11n, a first gas production pipe 121, a second gas production pipe 122, a third gas production pipe 123, ..., an nth gas production pipe 12n.

[0049] The first underground gas collecting pipe 111, the second underground gas collecting pipe 112, the third underground gas collecting pipe 113, ..., the nth underground gas collecting pipe 11n are all buried in the pipeline buried land 002, and are arranged parallel to the gas transmission pipe 001, 80 cm away from the ground surface.

[0050] The first gas monitoring pipe 101 is connected to the first underground gas collecting pipe 111, the second gas monitoring pipe 102 is connected to the second underground gas collecting pipe 112, the third gas monitoring pipe 103 is connected to the third underground gas collecting pipe 113, the nth gas monitoring pipe 10n is connected to the nth underground gas collecting pipe 11n, and 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 land 002 where the pipeline is buried. The top of the third gas monitoring pipe 103 and the nth gas monitoring pipe 10n are about 100 cm above the ground surface, and are covered with a waterproof, dustproof and breathable device (not shown in the figure) to prevent the influence of water accumulation on the roadbed and environmental moisture and dust on the monitoring gas. The first gas collection pipe 121 is connected to the first gas monitoring pipe 101, the second gas collection pipe 122 is connected to the second gas monitoring pipe 102, the third gas collection pipe 123 is connected to the third gas monitoring pipe 103, and the nth gas collection pipe 12n is connected to the nth gas monitoring pipe 10n. In this non-limiting embodiment, the gas monitoring pipe is thicker than the gas collection pipe to facilitate gas collection.

[0051] 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 production pipe 121, so as to control the closing state of the first gas production pipe 121, the second solenoid valve is connected to the second gas production pipe 122, the third solenoid valve is connected to the third gas production pipe 123, and the nth solenoid valve is connected to the nth gas production pipe 12n, so as to respectively control the closing states of the corresponding gas production pipes.

[0052] The pump-suction sampling air pump 161 is provided with an air inlet (not numbered in the figure) and an air outlet (not numbered in the figure), and the air inlet is connected to the common output port of the multi-channel electromagnetic valve group 131 .

[0053] The gas detection device includes a gas detection chamber 201 and a gas detection device 202. The gas detection device 202 performs real-time testing on the gas to be detected that reaches the gas detection chamber 201, obtains the detection data of the gas concentration in the gas to be detected, and records and displays the detection data. When the gas concentration exceeds 15% of the minimum explosion limit concentration LEL, an alarm is issued, and the detection data is compared with several pre-stored threshold ranges. When the detection data is in 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 issued and may be accompanied by a blue alarm sound broadcast; when the gas concentration is between 50% and 75% LEL, an orange alarm is issued and may be accompanied by an orange alarm sound broadcast; when the gas concentration is greater than 75% LEL, a red alarm is issued and may be accompanied by a red alarm sound broadcast.

[0054] The integrated control device 301 is communicatively connected with the multi-channel electromagnetic valve group 131 , the pump-suction sampling gas pump 161 and the gas detection device 202 .

[0055] As another non-limiting embodiment, Figure 1 As shown, it also includes a wireless transmission device 401, a cloud service device 402, a mobile terminal 403 and a solar cell device 501. The wireless transmission device 401 is connected to the integrated control device 301 and the cloud service device 402 for communication, so as to transmit the detection data obtained by the gas detection device 202 to the cloud service device 402, store the detection data, and compare the detection data with a plurality of pre-stored threshold ranges. When the detection data is within one of the threshold ranges, a corresponding warning signal is issued, and the 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 performs gradient graded warnings based on the gas explosion limit concentration (LEL). When the gas concentration exceeds 15% LEL (minimum explosion limit concentration), an alarm is issued. When the gas concentration is between 15% and 50% LEL, a blue alarm is issued and may be accompanied by a blue alarm sound broadcast; when the gas concentration is between 50% and 75% LEL, an orange alarm is issued and may be accompanied by an orange alarm sound broadcast; when the gas concentration is greater than 75% LEL, a red alarm is issued and may be accompanied by a red alarm sound broadcast.

[0056] The solar cell device 501 is electrically connected to the multi-channel electromagnetic valve group 131, the integrated control device 301 and the gas detection device 202, so as to ensure that the whole set of equipment operates independently and stably.

[0057] As another non-limiting embodiment, Figure 2As shown, it also includes a flooding sensor device 141 and a gas line pressure sensor device 151 disposed between the multi-channel electromagnetic valve group 131 and the pump-suction sampling air pump 161. When the sampling head (i.e., the top of the gas monitoring tube) is flooded, it is difficult to achieve gas sampling and gas leakage monitoring. The flooding sensor device 141 can ensure that the gas monitoring tube is in a dry environment for sampling monitoring. The gas line pressure sensor device 151 can monitor whether the pump-suction sampling air pump 161 is in normal working condition.

[0058] When using the active matrix online monitoring system for underground gas pipeline leakage provided by the present invention, Figure 3 As shown, first, in step S1, the integrated control device transmits instructions to the multi-channel solenoid valve group, opens a solenoid valve installed on a gas sampling pipe, and keeps the other solenoid valves in a closed state. Then, in step S2, the integrated control device transmits instructions to the pump-suction sampling gas pump, opens the pump-suction sampling gas pump, and maintains the set time. Subsequently, in step S3, the gas detection device performs real-time testing on the gas reaching the gas detection chamber, and records, displays, and judges its concentration. When the gas concentration exceeds the alarm limit, a sound and light alarm is issued. Then, in step S4, the wireless transmission device sends the detection data obtained by the gas detection device to the cloud service device, and the data is stored, compared, and judged on the cloud service device. When the gas concentration exceeds the alarm limit, an alarm signal is sent to the mobile terminal; finally, steps S1 to S4 are repeated until the gas concentration detection of all gas sampling pipes is completed, and then cyclic monitoring is performed.

[0059] Thus, during the operation of the entire system, the battery device 501 first supplies power to the integrated control device 301 and the gas detection device 202, and the integrated control device 301 and the gas detection device 202 begin the self-test process and are ready to start working. Then, the integrated control device 301 communicates and transmits instructions with the multi-channel solenoid valve group 131, and opens the first solenoid valve connected to the first gas sampling pipe 121, and keeps the other solenoid valves in a closed state. Subsequently, the integrated control device 301 communicates and transmits instructions with the pump-suction sampling air pump 161, opens the pump-suction 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 collection pipe and the gas monitoring pipe. Under the suction action of the pump-suction sampling gas pump 161, the combustible gas leaked from the buried gas pipe 001 to the buried land 002 collected by the first buried gas collection pipe 111 and the combustible gas diffused into the first gas monitoring pipe 101 can be sucked in and updated through the first gas sampling pipe 121 to the gas in the gas detection chamber 201. Then, the gas detection device 202 performs real-time testing on the gas reaching the gas detection chamber 201, and records, displays, and judges its concentration. When the gas concentration exceeds the alarm limit, a sound and light alarm will be issued. 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. The data is stored, compared and judged 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. After the gas in the first gas detection tube 101 is detected, the first gas solenoid valve will be closed, and then the second solenoid valve connected to the second gas sampling tube 122 will be opened, and then the above-mentioned operation steps will be repeated to complete the gas concentration detection in the second gas monitoring tube 102. In sequence, the gas concentration detection in all gas monitoring tubes from the third gas monitoring tube 103 to the nth gas monitoring tube 10n will be completed in sequence. After the gas concentration detection in all gas sampling tubes is completed, the next round of gas concentration monitoring will be started again from the first gas monitoring tube 101, and this cycle will be repeated to achieve online monitoring of gas leakage in the gas pipeline.

[0060] 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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An active matrix online monitoring system for underground gas pipeline leakage, characterized in that: It includes an integrated control device, a wireless transmission device, a cloud service device, a mobile terminal, a plurality of gas monitoring devices arranged in a matrix, a multi-channel solenoid valve group connected in sequence, a pump-suction sampling gas pump and a gas detection device, wherein: Each gas monitoring device comprises an underground gas collecting pipe, a gas monitoring pipe connected to the underground gas collecting pipe, and a gas sampling pipe connected to the gas outlet of the gas monitoring pipe, wherein the underground gas collecting pipe is buried in the stratum, 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; The multi-channel solenoid valve group includes a plurality of solenoid valves, each of which is correspondingly installed on one of the gas collection pipes to control the closing state of the gas collection pipe; 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; The gas detection device comprises a gas detection chamber and a gas detection device, the air inlet of the gas detection chamber is connected to the air outlet of the pump-suction sampling gas pump, the exhaust port of the gas detection chamber is connected to the gas detection device, the gas detection device is used to perform real-time testing on the gas to be tested that reaches 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 send a corresponding alarm signal when the detection data is within one of the threshold ranges; The integrated control device is communicatively connected with the multi-channel solenoid valve group, the pump-suction sampling air pump and the gas detection equipment; The wireless transmission device is communicatively connected with 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 with the mobile terminal, and is used to 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 warning signal is issued and the warning signal is transmitted to the mobile terminal.

2. The active matrix online monitoring system for underground gas pipeline leakage according to claim 1 is characterized in that: 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.

3. The active matrix online monitoring system for underground gas pipeline leakage according to claim 2 is characterized in that: The distance between two adjacent gas monitoring tubes is set to 10 to 15 meters.

4. The active matrix online monitoring system for underground gas pipeline leakage according to claim 2 is characterized in that: The top of each gas monitoring tube is not less than 50 cm from the formation surface.

5. The active matrix online monitoring system for underground gas pipeline leakage according to claim 2 is characterized in that: The top of the gas monitoring tube is covered with a waterproof, dustproof and breathable device.

6. The active matrix online monitoring system for underground gas pipeline leakage according to claim 1, characterized in that: It also includes a flooding sensor device and an air path pressure sensor device which are arranged between the multi-channel electromagnetic valve group and the pump-suction sampling air pump.

7. The active matrix online monitoring system for underground gas pipeline leakage according to claim 6, characterized in that: It also includes a solar cell device, which is electrically connected to the integrated control device, the gas detection equipment, the flooding sensor device and the gas path pressure sensor device.

8. The method for monitoring gas leakage using the active matrix online monitoring system for underground gas pipeline leakage according to any one of claims 1 to 7, characterized in that: The monitoring method comprises the following steps: (1) The integrated control device transmits instructions to the multi-channel solenoid valve group to open a solenoid valve installed on the gas collection pipe and keep the other solenoid valves in a closed state; (2) The integrated control device transmits instructions to the pump-suction sampling air pump to start the pump-suction sampling air pump and maintain the set time; (3) The gas detection equipment performs real-time testing on the gas reaching the gas detection chamber, and records, displays, and determines its concentration. When the gas concentration exceeds the alarm limit, a sound and light alarm is issued; (4) The wireless transmission device sends the detection data obtained by the gas detection device to the cloud service device, which stores, compares and judges the data. When the gas concentration exceeds the alarm limit, an alarm signal is sent to the mobile terminal; and (5) Repeat steps (1) to (4) until all gas concentrations in the gas production pipes are tested, and then perform cyclic monitoring.

9. The monitoring method according to claim 8, characterized in that: In step (4), when the gas concentration exceeds the alarm limit, the alarm signal is classified into levels according to the size of the gas concentration.

10. The monitoring method according to claim 8 or 9, characterized in that: Before step (1), the method further includes: the battery device supplies power to the integrated control device and the gas detection device, and the integrated control device and the gas detection device perform self-test.

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