Fuel gas pressure regulator fault monitoring system and monitoring method

Abstract

The invention discloses a fault monitoring system and a fault monitoring method for a gas pressure regulator. The fuel gas pressure regulator fault monitoring system comprises a main gas conveying pipe, a first three-way valve, a secondary gas conveying pipe, a fuel gas pressure regulator, a first sealing device, a second sealing device, a first pressure relief device, a second pressure relief device, a first leakage detection device, a second leakage detection device and a monitoring device. One end of the gas pressure regulator communicates with the first end of the first three-way valve, the other end of the gas pressure regulator communicates with the main gas conveying pipe, and the second end of the first three-way valve communicates with the secondary gas conveying pipe. A first sealing device is arranged outside the main gas conveying pipe, the secondary gas conveying pipe, the gas pressure regulator and the second sealing device in a surrounding mode, the main gas conveying pipe and the secondary gas conveying pipe penetrate out of the first sealing device, and the first sealing device seals the gas pressure regulator and the second sealing device. According to the gas pressure regulator fault monitoring system and monitoring method, the problem that in the prior art, pressure cannot be quickly released after gas leakage of a sealing sleeve is solved.

Description

Technical Field

[0001] The present invention relates to the field of gas monitoring, and in particular to a gas pressure regulator fault monitoring system and a monitoring method. Background Art

[0002] A Chinese patent discloses a 5G gas pressure regulator fault detection system with an application number of CN202311607806.2. The 5G gas pressure regulator fault detection system includes a main gas pipeline, a main pipe pressure regulator, a three-way valve, a secondary gas pipeline, a secondary pipe pressure regulator, an outer shell and a control module; a sealing partition that can be inserted into the outer shell is arranged between the main pipe pressure regulators; a first air pressure detector is installed on the inner wall of the compartment where each main pipe pressure regulator is located, which is suitable for detecting the air pressure state in the compartment; a section of the main gas pipeline contained in the compartment is provided with a sealing sleeve on the outside, and both ends are locked on the main gas pipeline, and a second air pressure detector is connected, which is suitable for detecting the air pressure state in the sealing sleeve; the first air pressure detector and the second air pressure detector are both electrically connected to the control module; a ventilation component is arranged outside the outer shell.

[0003] Although the above-mentioned 5G-based gas pressure regulator fault detection system realizes detection when gas is leaking, the 5G-based gas pressure regulator fault detection system still has the following problems: since the main gas pipeline is sealed by a sealing sleeve, when the main gas pipeline leaks, the gas pressure in the sealing sleeve may increase sharply, and the sealing sleeve may easily explode. Summary of the invention

[0004] The present invention provides a gas pressure regulator fault monitoring system and monitoring method, which solves the problem in the prior art that the sealing sleeve cannot release pressure quickly after leaking.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention firstly discloses a gas pressure regulator fault monitoring system, comprising: a main gas pipeline, a first three-way valve, a secondary gas pipeline, a gas pressure regulator, a first sealing device, a second sealing device, a first pressure relief device, a second pressure relief device, a first leakage detection device, a second leakage detection device and a monitoring device; one end of the gas pressure regulator is connected to the first end of the first three-way valve, the other end of the gas pressure regulator is connected to the main gas pipeline, and the second end of the first three-way valve is connected to the secondary gas pipeline; a first sealing device is arranged around the main gas pipeline, the secondary gas pipeline, the gas pressure regulator and the second sealing device, the first sealing device is provided for the main gas pipeline and the secondary gas pipeline to pass through, and the first sealing device is provided for the gas pressure regulator and the first three-way valve to pass through the main gas pipeline and the secondary gas pipeline, and the first sealing device is provided for the main gas pipeline and the secondary gas pipeline ... The first and second sealing devices are used for sealing; the second sealing device surrounds the main gas pipe, and the second sealing device seals the main gas pipe; a first pressure relief device is installed on the wall of the first sealing device, and a second pressure relief device is installed on the wall of the second sealing device, and the second pressure relief device passes through the first sealing device; a first leakage detection device is installed on the wall of the first sealing device, and a second leakage detection device is installed on the wall of the second sealing device, the output end group of the first leakage detection device and the output end group of the second leakage detection device are respectively connected to the first input end group and the second input end group of the monitoring device, and the first output end and the second output end of the monitoring device are respectively connected to the first pressure relief device and the second pressure relief device.

[0007] Preferably, the first leakage detection device and the second leakage detection device both include: a methane sensor and a first signal processing circuit, the output end of the methane sensor is connected to the input end of the first signal processing circuit, and the output end of the first signal processing circuit is an output end in the output end group of the first leakage detection device or an output end in the output end group of the second leakage detection device.

[0008] Preferably, the first leakage detection device and the second leakage detection device also include: an air pressure sensor and a second signal processing circuit, the output end of the air pressure sensor is connected to the input end of the second signal processing circuit, and the output end of the second signal processing circuit is another output end in the output end group of the first leakage detection device or another output end in the output end group of the second leakage detection device.

[0009] Preferably, the second pressure relief device includes: a pressure relief valve and a pressure relief pipeline, one end of the pressure relief valve is connected to the second sealing device, the other end of the pressure relief valve is connected to one end of the pressure relief pipeline, the pressure relief pipeline passes through the first sealing device, and the pressure relief valve is electrically connected to the second output end of the monitoring device.

[0010] Preferably, the first signal processing circuit in the first leakage detection device outputs a methane signal C1, the second signal processing circuit in the first leakage detection device outputs a pressure signal P1, the first signal processing circuit in the second leakage detection device outputs a methane signal C2, and the second signal processing circuit in the second leakage detection device outputs a pressure signal P2. The monitoring device controls the operation of the first pressure relief device and the second pressure relief device according to the methane signal C1, the pressure signal P1, the methane signal C2 and the pressure signal P2, and determines whether the main gas pipeline is leaking and whether the gas pressure regulator is leaking according to the methane signal C1, the pressure signal P1, the methane signal C2 and the pressure signal P2.

[0011] The present invention also discloses a method for monitoring a gas pressure regulator fault, comprising the following steps:

[0012] S1. Preparation before use: establishing a first prediction pressure model, a second prediction pressure model, a first prediction methane concentration model, and a second prediction methane concentration model;

[0013] The first prediction pressure model is: P11 = a0 + a1C1 + a2C1 2 +a3C1 3 +e1(regression formula 1); P11 is the first predicted pressure signal, a0, a1, a2 and a3 are obtained by substituting several groups of experimental methane signals C1 and pressure signals P1 into regression formula 1 for statistical analysis, and the pressure signal P1 is substituted into P11 in regression formula 1 during statistical analysis, and e1 is the mean square error of regression formula 1;

[0014] The second prediction pressure model is: P21 = b0 + b1C2 + b2C2 2 +b3C2 3 +e2 (regression formula 2); P21 is the second predicted pressure signal, b0, b1, b2 and b3 are obtained by substituting several groups of experimental methane signals C2 and pressure signals P2 into regression formula 2 for statistical analysis, and the pressure signal P2 is substituted into P21 in regression formula 2 during statistical analysis, and e2 is the mean square error of regression formula 2;

[0015] The first predicted methane concentration model is: C11 = d0 + d1P1 + d2P1 2 +d3P1 3 +e3 (regression formula three); C11 is the first predicted methane concentration signal, d0, d1, d2 and d3 are obtained by substituting several groups of experimental methane signals C1 and pressure signals P1 into regression formula three for statistical analysis. During the statistical analysis, the methane signal C1 is substituted into C11 in regression formula three, and e3 is the mean square error of regression formula three;

[0016] The second predicted methane concentration model is: C21 = f0 + f1P2 + f2P2 2 +f3P23 +e4 (regression formula 4); C21 is the second predicted methane concentration signal, f0, f1, f2 and f3 are obtained by substituting several groups of experimental methane signals C2 and pressure signals P2 into regression formula 4 for statistical analysis. During the statistical analysis, the methane signal C2 is substituted into C21 in regression formula 4, and e3 is the mean square error of regression formula 4;

[0017] S2, collecting methane signal C1, pressure signal P1, methane signal C2 and pressure signal P2 in real time through the first leakage detection device and the second leakage detection device;

[0018] S3, using the real-time acquisition of methane signal C1, pressure signal P1, methane signal C2 and pressure signal P2, calculate and obtain: a first predicted pressure signal P11, a second predicted pressure signal P21, a first predicted methane concentration signal C11 and a second predicted methane concentration signal C21;

[0019] S4. Fault monitoring is performed using the real-time methane signal C1, the real-time pressure signal P1, the real-time methane signal C2, the real-time pressure signal P2, the first predicted pressure signal P11, the second predicted pressure signal P21, the first predicted methane concentration signal C11 and the second predicted methane concentration signal C21.

[0020] Preferably, S4 comprises the following steps:

[0021] S41, calculate P12, P22, C12 and C22,

[0022] S42, determine whether one of the first set of conditions is not satisfied. If one of the first set of conditions is not satisfied, determine that there is a gas pressure regulator leakage phenomenon. If not, it is normal. The first set of conditions includes condition one and condition two. Condition one: C12 and real-time methane signal C1 are both within the first range; condition two: P12 and real-time pressure signal P1 are both within the second range.

[0023] Determine whether one of the second set of conditions is not met. If one of the second set of conditions is not met, it is determined that there is a leakage in the main gas pipeline. If not, it is normal. The second set of conditions includes condition three and condition four. Condition three: C22 and the real-time methane signal C2 are both within the third range; Condition four: P22 and the real-time pressure signal P2 are both within the fourth range.

[0024] S43. Output the judgment result.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the present application, by providing a second pressure relief device, the second sealing device can be depressurized when the main gas pipeline leaks, thereby avoiding explosion when the main gas pipeline leaks due to the inability of the sealing tube in the prior art (i.e., the second sealing device of the present application) to relieve pressure, thereby improving safety.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the gas pressure regulator fault monitoring system after the first sealing device is cut open.

[0029] Figure numerals: main gas pipeline 1, first three-way valve 2, secondary gas pipeline 3, gas pressure regulator 4, first sealing device 5, second sealing device 6, second pressure relief device 7, pressure relief valve 71, pressure relief pipeline 72, first leakage detection device 8, second leakage detection device 9. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0031] Example 1

[0032] like Figure 1As shown, the present embodiment discloses a gas pressure regulator fault monitoring system, comprising: a main gas pipeline 1, a first three-way valve 2, a secondary gas pipeline 3, a gas pressure regulator 4, a first sealing device 5, a second sealing device 6, a first pressure relief device (not shown), a second pressure relief device 7, a first leakage detection device 8, a second leakage detection device 9 and a monitoring device; one end of the gas pressure regulator 4 is connected to the first end of the first three-way valve 2, the other end of the gas pressure regulator 4 is connected to the main gas pipeline 1, and the second end of the first three-way valve 2 is connected to the secondary gas pipeline 3; a first sealing device 5 is arranged around the main gas pipeline 1, the secondary gas pipeline 3, the gas pressure regulator 4 and the second sealing device 6, the first sealing device 5 is for the main gas pipeline 1 and the secondary gas pipeline 3 to pass through, and the first sealing device 5 is for the gas pressure regulator 4 to detect the leakage of the gas. The gas pressure regulator 4 and the second sealing device 6 are sealed; the second sealing device 6 surrounds the main gas pipeline 1, and the second sealing device 6 seals the main gas pipeline 1; a first pressure relief device is installed on the wall of the first sealing device 5, and a second pressure relief device 7 is installed on the wall of the second sealing device 6, and the second pressure relief device 7 passes through the first sealing device 5; a first leakage detection device 8 is installed on the wall of the first sealing device 5, and a second leakage detection device 9 is installed on the wall of the second sealing device 6, the output end group of the first leakage detection device 8 and the output end group of the second leakage detection device 9 are respectively connected to the first input end group and the second input end group of the monitoring device, and the first output end and the second output end of the monitoring device are respectively connected to the first pressure relief device and the second pressure relief device 7.

[0033] The first leakage detection device 8 and the second leakage detection device 9 both include: a methane sensor and a first signal processing circuit, the output end of the methane sensor is connected to the input end of the first signal processing circuit, and the output end of the first signal processing circuit is an output end in the output end group of the first leakage detection device 8 or an output end in the output end group of the second leakage detection device 9. The two methane sensors are used to detect the air in the first sealing device 5 and the second sealing device 6 respectively. Generally, there is no methane component. If the gas leaks, the presence of methane will be detected, thereby respectively detecting whether the gas pressure regulator 4 and the main gas pipeline 1 are leaking.

[0034] The first leakage detection device 8 and the second leakage detection device 9 both further include: an air pressure sensor and a second signal processing circuit, the output end of the air pressure sensor is connected to the input end of the second signal processing circuit, and the output end of the second signal processing circuit is another output end in the output end group of the first leakage detection device 8 or another output end in the output end group of the second leakage detection device 9. If the first sealing device 5 and the second sealing device 6 both detect whether there is a leak through a methane sensor, there will be a case of missed judgment, so dual detection of methane detection and pressure detection is adopted to ensure the reliability of the detection results. When a detection indicator appears, it can be judged whether there is a leak, thereby improving safety.

[0035] The second pressure relief device 7 includes: a pressure relief valve 71 and a pressure relief pipeline 72. One end of the pressure relief valve 71 is connected to the second sealing device 6, and the other end of the pressure relief valve 71 is connected to one end of the pressure relief pipeline 72. The pressure relief pipeline 72 passes through the first sealing device 5, and the pressure relief valve 71 is electrically connected to the second output end of the monitoring device. When the main gas transmission pipe 1 leaks, the pressure relief valve 71 is controlled to connect to the pressure relief pipeline 72, thereby ensuring that the pressure relief work can be carried out normally.

[0036] The first signal processing circuit in the first leakage detection device 8 outputs a methane signal C1, the second signal processing circuit in the first leakage detection device 8 outputs a pressure signal P1, the first signal processing circuit in the second leakage detection device 9 outputs a methane signal C2, and the second signal processing circuit in the second leakage detection device 9 outputs a pressure signal P2. The monitoring device controls the operation of the first pressure relief device and the second pressure relief device 7 according to the methane signal C1, the pressure signal P1, the methane signal C2, and the pressure signal P2, and determines whether the main gas pipeline 1 is leaking and whether the gas pressure regulator 4 is leaking according to the methane signal C1, the pressure signal P1, the methane signal C2, and the pressure signal P2. Whether the gas pressure regulator 4 is leaking can be determined by the two data of the methane signal C1 and the pressure signal P1, thereby improving the reliability of the determination. Whether the main gas pipe is leaking can be determined by the two data of the methane signal C2 and the pressure signal P2, thereby improving the reliability of the determination.

[0037] Example 2

[0038] Based on the gas pressure regulator fault monitoring system described in Example 1, this embodiment discloses a gas pressure regulator fault monitoring method, including the following steps:

[0039] S1. Preparation before use: establishing a first prediction pressure model, a second prediction pressure model, a first prediction methane concentration model, and a second prediction methane concentration model;

[0040] The first prediction pressure model is: P11 = a0 + a1C1 + a2C1 2 +a3C1 3 +e1(regression formula 1); P11 is the first predicted pressure signal, a0, a1, a2 and a3 are obtained by substituting several groups of experimental methane signals C1 and pressure signals P1 into regression formula 1 for statistical analysis, and the pressure signal P1 is substituted into P11 in regression formula 1 during statistical analysis, and e1 is the mean square error of regression formula 1;

[0041] The second prediction pressure model is: P21 = b0 + b1C2 + b2C2 2 +b3C2 3+e2 (regression formula 2); P21 is the second predicted pressure signal, b0, b1, b2 and b3 are obtained by substituting several groups of experimental methane signals C2 and pressure signals P2 into regression formula 2 for statistical analysis, and the pressure signal P2 is substituted into P21 in regression formula 2 during statistical analysis, and e2 is the mean square error of regression formula 2;

[0042] The first predicted methane concentration model is: C11 = d0 + d1P1 + d2P1 2 +d3P1 3 +e3 (regression formula three); C11 is the first predicted methane concentration signal, d0, d1, d2 and d3 are obtained by substituting several groups of experimental methane signals C1 and pressure signals P1 into regression formula three for statistical analysis. During the statistical analysis, the methane signal C1 is substituted into C11 in regression formula three, and e3 is the mean square error of regression formula three;

[0043] The second predicted methane concentration model is: C21 = f0 + f1P2 + f2P2 2 +f3P2 3 +e4 (regression formula four); C21 is the second predicted methane concentration signal, f0, f1, f2 and f3 are obtained by substituting several groups of experimental methane signals C2 and pressure signals P2 into regression formula four for statistical analysis. During the statistical analysis, the methane signal C2 is substituted into C21 in regression formula four, and e3 is the mean square error of regression formula four; (through the above four regression formulas, four predicted data are obtained respectively: the first predicted pressure signal P11, the second predicted pressure signal P21, the first predicted methane concentration signal C11 and the second predicted methane concentration signal C21)

[0044] S2. Real-time collection of methane signal C1, pressure signal P1, methane signal C2 and pressure signal P2 by the first leakage detection device and the second leakage detection device; (Since the actual monitoring data is different from the predicted data, the real-time detection data is also worth referring to, and the predicted data is also referred to, thereby increasing the judgment data for subsequent pre-judgment)

[0045] S3, using the real-time acquisition of methane signal C1, pressure signal P1, methane signal C2 and pressure signal P2, calculate and obtain: a first predicted pressure signal P11, a second predicted pressure signal P21, a first predicted methane concentration signal C11 and a second predicted methane concentration signal C21;

[0046] S4. Fault monitoring is performed using the real-time methane signal C1, the real-time pressure signal P1, the real-time methane signal C2, the real-time pressure signal P2, the first predicted pressure signal P11, the second predicted pressure signal P21, the first predicted methane concentration signal C11 and the second predicted methane concentration signal C21.

[0047] Preferably, S4 comprises the following steps:

[0048] S41, calculate P12, P22, C12 and C22,

[0049]

[0050] S42, determine whether one of the first set of conditions is not satisfied. If one of the first set of conditions is not satisfied, determine that there is a gas pressure regulator leakage phenomenon. If not, it is normal. The first set of conditions includes condition one and condition two. Condition one: C12 and real-time methane signal C1 are both within the first range; condition two: P12 and real-time pressure signal P1 are both within the second range.

[0051] Determine whether one of the second set of conditions is not met. If one of the second set of conditions is not met, it is determined that there is a leakage in the main gas pipeline. If not, it is normal. The second set of conditions includes condition three and condition four. Condition three: C22 and the real-time methane signal C2 are both within the third range; Condition four: P22 and the real-time pressure signal P2 are both within the fourth range.

[0052] S43, output the judgment result. Since the above judgment process is implemented by judging whether the data is within the first range, the second range, the third range and the fourth range respectively, as long as it exceeds the range, it can be judged that there is a leak, so P12, P22, C12 and C22 are calculated, and P12, P22, C12 and C22 are the predicted value plus the absolute value of the mean square error and the absolute value of the error between the predicted and real-time data, so that the predicted value data has a certain increase. Since the more methane leaks, the larger the data, the predicted value is also increased accordingly, so as to achieve a joint judgment through the predicted value and the real-time collected value, and the leakage data can be detected after a slight increase, which improves the reliability of fault judgment and improves safety at the same time.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A gas pressure regulator fault monitoring system, characterized in that: include: A main gas pipeline, a first three-way valve, a secondary gas pipeline, a gas pressure regulator, a first sealing device, a second sealing device, a first pressure relief device, a second pressure relief device, a first leakage detection device, a second leakage detection device, and a monitoring device; One end of the gas pressure regulator is connected to the first end of the first three-way valve, the other end of the gas pressure regulator is connected to the main gas pipeline, and the second end of the first three-way valve is connected to the secondary gas pipeline; A first sealing device is arranged around the main gas pipeline, the secondary gas pipeline, the gas pressure regulator and the second sealing device. The first sealing device is used for the main gas pipeline and the secondary gas pipeline to pass through. The first sealing device seals the gas pressure regulator and the second sealing device. The second sealing device surrounds the main gas pipeline, and the second sealing device seals the main gas pipeline; A first pressure relief device is installed on the wall of the first sealing device, and a second pressure relief device is installed on the wall of the second sealing device, and the second pressure relief device passes through the first sealing device; A first leakage detection device is installed on the wall of the first sealing device, and a second leakage detection device is installed on the wall of the second sealing device. The output end group of the first leakage detection device and the output end group of the second leakage detection device are respectively connected to the first input end group and the second input end group of the monitoring device, and the first output end and the second output end of the monitoring device are respectively connected to the first pressure relief device and the second pressure relief device.

2. A gas pressure regulator fault monitoring system according to claim 1, characterized in that: The first leakage detection device and the second leakage detection device both include: a methane sensor and a first signal processing circuit, the output end of the methane sensor is connected to the input end of the first signal processing circuit, and the output end of the first signal processing circuit is an output end in the output end group of the first leakage detection device or an output end in the output end group of the second leakage detection device.

3. A gas pressure regulator fault monitoring system according to claim 2, characterized in that: The first leakage detection device and the second leakage detection device also include: an air pressure sensor and a second signal processing circuit, the output end of the air pressure sensor is connected to the input end of the second signal processing circuit, and the output end of the second signal processing circuit is another output end in the output end group of the first leakage detection device or another output end in the output end group of the second leakage detection device.

4. A gas pressure regulator fault monitoring system according to claim 1, characterized in that: The second pressure relief device includes: a pressure relief valve and a pressure relief pipeline. One end of the pressure relief valve is connected to the second sealing device, and the other end of the pressure relief valve is connected to one end of the pressure relief pipeline. The pressure relief pipeline passes through the first sealing device, and the pressure relief valve is electrically connected to the second output end of the monitoring device.

5. A gas pressure regulator fault monitoring system according to claim 3, characterized in that: The first signal processing circuit in the first leakage detection device outputs a methane signal C1, the second signal processing circuit in the first leakage detection device outputs a pressure signal P1, the first signal processing circuit in the second leakage detection device outputs a methane signal C2, and the second signal processing circuit in the second leakage detection device outputs a pressure signal P2. The monitoring device controls the operation of the first pressure relief device and the second pressure relief device according to the methane signal C1, the pressure signal P1, the methane signal C2 and the pressure signal P2, and determines whether the main gas pipeline is leaking and whether the gas pressure regulator is leaking according to the methane signal C1, the pressure signal P1, the methane signal C2 and the pressure signal P2.

6. A method for monitoring a gas pressure regulator fault, characterized in that: The steps include: S1. Preparation before use: establishing a first prediction pressure model, a second prediction pressure model, a first prediction methane concentration model, and a second prediction methane concentration model; The first prediction pressure model is: P11 = a0 + a1C1 + a2C1 2 +a3C1 3 +e1(regression formula 1); P11 is the first predicted pressure signal, a0, a1, a2 and a3 are obtained by substituting several groups of experimental methane signals C1 and pressure signals P1 into regression formula 1 for statistical analysis, and the pressure signal P1 is substituted into P11 in regression formula 1 during statistical analysis, and e1 is the mean square error of regression formula 1; The second prediction pressure model is: P21 = b0 + b1C2 + b2C2 2 +b3C2 3 +e2 (regression formula 2); P21 is the second predicted pressure signal, b0, b1, b2 and b3 are obtained by substituting several groups of experimental methane signals C2 and pressure signals P2 into regression formula 2 for statistical analysis, and the pressure signal P2 is substituted into P21 in regression formula 2 during statistical analysis, and e2 is the mean square error of regression formula 2; The first predicted methane concentration model is: C11 = d0 + d1P1 + d2P1 2 +d3P1 3 +e3 (regression formula three); C11 is the first predicted methane concentration signal, d0, d1, d2 and d3 are obtained by substituting several groups of experimental methane signals C1 and pressure signals P1 into regression formula three for statistical analysis. During the statistical analysis, the methane signal C1 is substituted into C11 in regression formula three, and e3 is the mean square error of regression formula three; The second predicted methane concentration model is: C21 = f0 + f1P2 + f2P2 2 +f3P2 3 +e4 (regression formula 4); C21 is the second predicted methane concentration signal, f0, f1, f2 and f3 are obtained by substituting several groups of experimental methane signals C2 and pressure signals P2 into regression formula 4 for statistical analysis. During the statistical analysis, the methane signal C2 is substituted into C21 in regression formula 4, and e3 is the mean square error of regression formula 4; S2, collecting methane signal C1, pressure signal P1, methane signal C2 and pressure signal P2 in real time through the first leakage detection device and the second leakage detection device; S3, using the real-time acquisition of methane signal C1, pressure signal P1, methane signal C2 and pressure signal P2, calculate and obtain: a first predicted pressure signal P11, a second predicted pressure signal P21, a first predicted methane concentration signal C11 and a second predicted methane concentration signal C21; S4. Fault monitoring is performed using the real-time methane signal C1, the real-time pressure signal P1, the real-time methane signal C2, the real-time pressure signal P2, the first predicted pressure signal P11, the second predicted pressure signal P21, the first predicted methane concentration signal C11 and the second predicted methane concentration signal C21.

7. The method for monitoring gas pressure regulator fault according to claim 6, characterized in that: S4 includes the following steps: S41, calculate P12, P22, C12 and C22, S42, determine whether one of the first set of conditions is not satisfied. If one of the first set of conditions is not satisfied, determine that there is a gas pressure regulator leakage phenomenon. If not, it is normal. The first set of conditions includes condition one and condition two. Condition one: C12 and real-time methane signal C1 are both within the first range; condition two: P12 and real-time pressure signal P1 are both within the second range. Determine whether one of the second set of conditions is not met. If one of the second set of conditions is not met, it is determined that there is a leakage in the main gas pipeline. If not, it is normal. The second set of conditions includes condition three and condition four. Condition three: C22 and the real-time methane signal C2 are both within the third range; Condition four: P22 and the real-time pressure signal P2 are both within the fourth range. S43. Output the judgment result.

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