A device and method for online detection of tetrahydrothiophene concentration in gas pipelines

Abstract

The application discloses a device and method for online detection of tetrahydrothiophene concentration of gas pipeline, which comprises a gas inlet pipe and a tetrahydrothiophene sensor, further comprises a first communication part, an air pump, an air inlet pipe, the air inlet pipe and the gas inlet pipe are communicated with the first communication part, the outlet end of the first communication part is connected with the air pump through a pipeline, the outlet end of the air pump is connected with a flow meter, the tetrahydrothiophene sensor and a second communication part in sequence, further comprises a gas outlet pipe and an air outlet pipe communicated with the second communication part; the gas inlet pipe, the air inlet pipe, the gas outlet pipe and the air outlet pipe are all provided with electromagnetic valves; further comprises a shell with a detection cavity, the electromagnetic valves, the first communication part, the air pump, the tetrahydrothiophene sensor, the second communication part are all located in the detection cavity, and a gas sensor is arranged in the detection cavity. The gas pump, the gas sensor and the flow meter are arranged, so that whether the device leaks is detected, and the safety performance is increased under the premise of ensuring the detection precision.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a device and method for online detection of tetrahydrothiophene concentration in a gas pipeline. Background Art

[0002] CCJ 148-2010, the Technical Specification for Urban Gas Odorization, stipulates: 3.2.1-3.2.3 To improve gas supply safety, the odorization concentration should be maintained within a certain range to ensure that the THT concentration at the pipeline end exceeds the minimum detection level. After THT is added to a town gas pipeline, its concentration gradually decreases over time and with increasing distance from the odorization point due to adsorption of THT by the pipeline. When the THT concentration at the pipeline end falls below the minimum detection level, the odorization rate should generally be increased or additional odorization points should be added.

[0003] At present, the common tetrahydrothiophene detectors in the industry mostly use imported electrochemical tetrahydrothiophene sensors, which have problems such as short service life, regular maintenance requirements, and weak anti-interference ability against interfering gases such as methane in fuel gas; the detection methods are mostly handheld methane gas detectors, which cannot achieve online detection.

[0004] After searching, the patent application publication number is: CN116519900A, and the Chinese patent named "Fixed Tetrahydrothiophene Online Detector and Detection Method" discloses an online monitoring device and detection method for gas concentration, and a purge function is set to avoid poisoning of the tetrahydrothiophene sensor. The shortcomings of this patent are: if a leak occurs in the gas intake channel, the detection accuracy will be inaccurate, and if a leak occurs during the air flushing process, when the volume concentration of natural gas is within a specific range, it is easy to explode when it encounters fire, posing certain safety hazards; the patent application number is: CN110320251A, and the Chinese patent named "An Online Detection Device and Detection Method for Hydrogen Sulfide and Tetrahydrothiophene Content in Natural Gas" discloses a technical solution of setting an air pump in the air exhaust pipe and the gas exhaust pipe, which cannot guarantee the detection accuracy and reduce the risk of gas leakage.

[0005] Therefore, there is an urgent need for an online detection device and a detection method that can improve detection accuracy and increase safety performance. Summary of the Invention

[0006] In order to solve the technical problems existing in the background technology, the present invention proposes a device and method for online detection of tetrahydrothiophene concentration in a gas pipeline.

[0007] The application provides a device for online detection of tetrahydrothiophene concentration in a gas pipeline, which comprises a gas inlet pipe and a tetrahydrothiophene sensor, further comprises a first communication member, an air pump, an air inlet pipe, the air inlet pipe and the gas inlet pipe are communicated with the air inlet end of the first communication member, the air outlet end of the first communication member is connected with the air pump through a pipeline, the air outlet end of the air pump is communicated with the flow meter through a pipeline, and the air outlet end of the flow meter is communicated with the tetrahydrothiophene sensor through a pipeline.

[0008] The air outlet end of the tetrahydrothiophene sensor is connected with a second communication member through a pipeline, and further comprises a gas outlet pipe and an air outlet pipe which are communicated with the second communication member.

[0009] The gas inlet pipe is provided with a first electromagnetic valve, the air inlet pipe is provided with a second electromagnetic valve, the gas outlet pipe is provided with a third electromagnetic valve, and the air outlet pipe is provided with a fourth electromagnetic valve.

[0010] Further comprising a shell with a closed detection cavity, the first electromagnetic valve, the second electromagnetic valve, the first communication member, the air pump, the tetrahydrothiophene sensor, the second communication member, the third electromagnetic valve and the fourth electromagnetic valve are located in the detection cavity, and a gas sensor is arranged in the detection cavity.

[0011] Preferably, an air drying member is arranged at the end of the air inlet pipe away from the second electromagnetic valve, so as to filter out moisture in the air and avoid the influence of moisture on the service life of the sensor.

[0012] Preferably, when the gas sensor detects gas in the detection cavity, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are closed.

[0013] Preferably, a controller is further arranged, which is connected with the first electromagnetic valve, the second electromagnetic valve, the air pump, the third electromagnetic valve and the fourth electromagnetic valve and is used for controlling the opening and closing of the first electromagnetic valve, the second electromagnetic valve, the air pump, the third electromagnetic valve and the fourth electromagnetic valve, and the flow meter, the tetrahydrothiophene sensor and the gas sensor are connected with the controller and transmit the collected information to the controller.

[0014] Preferably, the air pump, the flow meter and the tetrahydrothiophene sensor are fixed on the shell, the gas inlet pipe, the air inlet pipe, the gas outlet pipe and the air outlet pipe are all made of rigid materials, the shell is provided with connecting through holes, the gas inlet pipe, the air inlet pipe, the gas outlet pipe and the air outlet pipe all penetrate different connecting through holes, and elastic sealing assemblies are arranged between the connecting through holes and the gas inlet pipe, the air inlet pipe, the gas outlet pipe or the air outlet pipe.

[0015] Preferably, the elastic sealing assembly comprises a first conical seal and a second conical seal, the first conical seal is sleeved outside the gas inlet pipe, the air inlet pipe, the gas outlet pipe or the air outlet pipe, the second conical seal is sleeved outside the first conical seal and abuts against the inner wall of the connecting through hole, and the large-diameter end of the first conical seal is located on the same side as the small-diameter end of the second conical seal.

[0016] Preferably, when the gas inlet pipe, the air inlet pipe, the gas outlet pipe or the air outlet pipe is installed, the first conical seal is installed on the shell, and after the position of the gas inlet pipe, the air inlet pipe, the gas outlet pipe or the air outlet pipe is adjusted, the second conical seal is sleeved outside the first conical seal and fixes the first conical seal.

[0017] Preferably, the large-diameter end of the first conical seal has a first abutting ring which abuts against a first side of the shell, the large-diameter end of the second conical seal has a second abutting ring which abuts against a second side of the shell, and the first side is opposite to the second side.

[0018] Preferably, the outer side of the gas inlet pipe, the air inlet pipe, the gas outlet pipe and / or the air outlet pipe is sleeved with an O-shaped sealing ring which abuts against the inner wall of the first conical seal.

[0019] A method for online detection of tetrahydrothiophene concentration in a gas pipeline, which applies the device and comprises sequentially collecting monitoring mode, air cleaning mode and standby mode, and after the standby mode ends, the three modes are recycled in sequence, and the monitoring mode is performed in the process of collecting monitoring mode, air cleaning mode and standby mode.

[0020] The collecting monitoring mode comprises:

[0021] The power supply of the first electromagnetic valve, the third electromagnetic valve and the tetrahydrothiophene sensor is turned on, the power supply of the second electromagnetic valve and the fourth electromagnetic valve is turned off, the air pump is turned on, the gas in the pipeline is quantitatively passed through the flowmeter, then passed through the tetrahydrothiophene sensor and discharged through the gas outlet pipe, and the tetrahydrothiophene sensor transmits the detected data to the terminal device.

[0022] The air cleaning mode comprises:

[0023] The power supply of the first electromagnetic valve, the third electromagnetic valve and the tetrahydrothiophene sensor is turned off, the power supply of the second electromagnetic valve and the fourth electromagnetic valve is turned on, and the air pump is turned on to blow the gas in the pipeline and discharge it through the air outlet pipe.

[0024] The standby mode comprises:

[0025] Turning off the power supply of the first electromagnetic valve, the second electromagnetic valve, the tetrahydrothiophene sensor, the third electromagnetic valve, the fourth electromagnetic valve and the air pump;

[0026] The monitoring mode comprises detecting whether there is gas leakage in the detection cavity through the gas sensor, and if the gas sensor detects that there is gas in the detection cavity, turning off the external power supply, specifically comprising the power supply of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the air pump and the tetrahydrothiophene sensor.

[0027] In the present application, the device and method for online detection of tetrahydrothiophene concentration in a gas pipeline are provided, which realizes quantitative and constant-speed gas transmission to the tetrahydrothiophene sensor through the air pump, and further realizes reliable temperature collection and transmission of tetrahydrothiophene concentration data. The structure of the detection cavity avoids the entry of external air, the gas sensor detects whether there is gas leakage in the device to avoid the risk of combustion and explosion, and further, the length of the pipe fittings (including the gas inlet pipe, the air inlet pipe, the gas outlet pipe and the gas inlet pipe) is adjusted under the premise of ensuring the sealing property through the structure of the sealing assembly, and further, the size of the gas outlet is adjusted through the second conical sealing to adjust the discharge of the gas in the detection cavity (since the volume ratio of the gas in the air is within a certain range, the combustion and explosion risk can be reduced by controlling the volume ratio of the gas to be less than the range) when there is gas leakage in the detection cavity, thereby reducing the risk of combustion and explosion.

[0028] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present application;

[0030] Figure 2 It is an automatic power-off circuit diagram in some embodiments of the present application;

[0031] Figure 3 It is a connection structure schematic diagram of the gas outlet pipe and the shell in some embodiments;

[0032] In the figure: 1. Gas inlet pipe; 2. Tetrahydrothiophene sensor; 3. First connecting piece; 4. Air pump; 5. Air inlet pipe; 6. Flow meter; 7. Second connecting piece; 8. Gas outlet pipe; 9. Air outlet pipe; 10. First solenoid valve; 11. Second solenoid valve; 12. Air drying element; 13. Third solenoid valve; 14. Fourth solenoid valve; 15. Housing; 150. Connecting hole; 16. Gas sensor; 17. O-ring; 18. First conical seal; 19. Second conical seal; 20. First contact ring; 21. Second contact ring; 22. Controller; 23. 4G module. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and are not to be construed as limiting the present invention.

[0034] like Figure 1-Figure 2 The device shown is for online detection of tetrahydrothiophene concentration in a gas pipeline, comprising a gas inlet pipe 1 and a tetrahydrothiophene sensor 2, a first connecting piece 3, an air pump 4, and an air inlet pipe 5. The air inlet pipe 5 and the gas inlet pipe 1 are both connected to the inlet end of the first connecting piece 3. The outlet end of the first connecting piece 3 is connected to the air pump 4 via a pipeline. The air pump 4 is a diaphragm air pump 4. The outlet end of the air pump 4 is connected to a flow meter 6 via a pipeline. The outlet end of the flow meter 6 is connected to the tetrahydrothiophene sensor 2 via a pipeline.

[0035] The gas outlet end of the tetrahydrothiophene sensor 2 is connected to a second connecting piece 7 via a pipeline, and further includes a gas outlet pipe 8 and an air outlet pipe 9 connected to the second connecting piece 7. The gas inlet pipe 1 and the gas outlet pipe 8 are both connected to the gas pipeline.

[0036] In this embodiment, the first connecting member 3 and the second connecting member 7 may be a tee pipe. Of course, those skilled in the art may also choose other structures with connecting cavities.

[0037] A first solenoid valve 10 is provided on the gas inlet pipe 1, a second solenoid valve 11 is provided on the air inlet pipe 5, a third solenoid valve 13 is provided on the gas outlet pipe 8, and a fourth solenoid valve 14 is provided on the air outlet pipe 9;

[0038] The device further includes a housing 15 having a closed detection chamber, which can be made of a metal material. The first solenoid valve 10, the second solenoid valve 11, the first connecting piece 3, the air pump 4, the tetrahydrothiophene sensor 2, the second connecting piece 7, the third solenoid valve 13 and the fourth solenoid valve 14 are all located in the detection chamber. A gas sensor 16 is provided in the detection chamber. The gas sensor 16 is used to detect whether there is a gas leak in the detection chamber. If there is a gas leak, the device stops working, that is, the first solenoid valve 10, the second solenoid valve 11 and the third solenoid valve 13, the fourth solenoid valve 14 and the air pump 4 are closed;

[0039] When detecting the concentration of tetrahydrothiophene in the gas pipeline: open the first solenoid valve 10 and the third solenoid valve 13, close the second solenoid valve 11 and the fourth solenoid valve 14, turn on the air pump 4 to allow the gas in the pipeline to pass through the flow meter 6 in a quantitative manner and then be discharged through the tetrahydrothiophene sensor 2 through the gas outlet pipe 8. The tetrahydrothiophene sensor 2 transmits the detected data to the terminal device. The detection process can be intermittent and periodic. When the detection is completed, the first solenoid valve 10 is closed first, and then the air pump 4 works to pump the gas in front of the air pump 4 into the gas outlet pipe 8, and then the air pump 4 and the third solenoid valve 13 are closed;

[0040] When the detection is completed, close the first solenoid valve 10 and the third solenoid valve 13, open the second solenoid valve 11 and the fourth solenoid valve 14, and then remove the residual gas in the device through gas to ensure the accuracy of the next detection of tetrahydrothiophene concentration. Preferably, an air drying element 12 is provided at the end of the air inlet pipe 5 away from the second solenoid valve 11.

[0041] When starting to blow the gas, first open the second solenoid valve 11 and then open the air pump 4 and the fourth solenoid valve 14. At the beginning, the flow rate of the air pump 4 is relatively small, so that the flow rate of the gas discharged from the air outlet pipe 9 is relatively small, and then increase the flow rate of the gas discharged by the air pump 4, and then increase the flow rate of the gas discharged by the air pump 4 to increase the gas flushing effect on the pipeline.

[0042] Furthermore, the arrangement of the air pump 4 and the flow meter 6 can be used to easily determine whether the pipeline between the air pump 4 and the flow meter 6 is leaking;

[0043] Furthermore, after closing the four solenoid valves, if the air pump 4 can operate and the flow detected by the flow meter 6 gradually decreases, the pipeline before the flow meter 6 is not leaking, that is, the pipeline between the first connecting piece 3 and the air pump 4 and the flow meter 6 is not leaking; if the flow detected by the flow meter 6 has not changed after turning on the air pump 4, the pipeline before the flow meter 6 is leaking, that is, if the pipeline leaks, the settings of the air pump 4 and the flow meter 6 can be used to preliminarily determine whether it is the pipeline before the flow meter 6 or the pipeline after the flow meter 6 that is leaking.

[0044] Preferably, a controller 22 is also included, which is connected to the first solenoid valve 10, the second solenoid valve 11, the air pump 4, the third solenoid valve 13, and the fourth solenoid valve 14 and is used to control the opening and closing of the first solenoid valve 10, the second solenoid valve 11, the air pump 4, the third solenoid valve 13, and the fourth solenoid valve 14. The tetrahydrothiophene sensor 2 and the gas sensor 16 are also connected to the controller 22 and transmit the detected information to the controller 22. Preferably, there is a communication module on the controller 22, which can be a 4G module 23 or a 5G module. In this embodiment, it is a 4G module 23. The external terminal device is connected to the controller 22 through the communication module to detect the action of the device and the data detected by the detector at all times.

[0045] In some embodiments, the controller 22 is preferably provided with an automatic power-off circuit, specifically as follows: Figure 2 As shown, when the device switch is turned on, that is, the POWER_ON switch circuit of the automatic power-off circuit is turned on, 24V_IN1 can power the entire instrument through the turned-on circuit. At this time, the controller 22 pulls up PWR_CTRL to enable the conduction of the Q4 transistor. At this time, VCC_24V forms a loop with GND through R6. At this time, the POWER_ON switch is turned off, and the system's VCC_24V loop still exists, and the system still works normally.

[0046] When the system detects a gas leak, it will shut down the system. At this time, the controller 22 will pull down PWR_CTRL, disable the Q4 transistor, and turn off the output of the Q4 transistor. At this time, the loop formed by VCC_24V through R6 and GND is closed, and the loop of the POWER_ON switch is also closed. At this time, there is no loop between VCC_24V and GND in the system. The system is not powered at this time, and the entire system is in a power-off and non-working state, eliminating the risk of explosion of the device.

[0047] like Figure 3As shown, preferably, the air pump 4, the flow meter 6 and the tetrahydrothiophene sensor 2 are fixed on the housing 15, the gas inlet pipe 1, the air inlet pipe 5, the gas outlet pipe 8 and the air outlet pipe 9 are all made of rigid materials, and a connecting through hole 150 is opened on the housing 15. The gas inlet pipe 1, the air inlet pipe 5, the gas outlet pipe 8 and the air outlet pipe 9 all pass through a different connecting through hole 150, and an elastic sealing component is provided between the connecting through hole 150 and the gas inlet pipe 1, the air inlet pipe 5, the gas outlet pipe 8 or the air outlet pipe 9. Specifically, in this embodiment, the elastic sealing assembly includes a first conical seal 18 and a second conical seal 19. The first conical seal sleeve is arranged on the outside of the gas inlet pipe 1, the air inlet pipe 5, the gas outlet pipe 8 or the air outlet pipe 9. The second conical seal 19 is arranged on the outside of the first conical seal 18 and contacts the inner wall of the connecting through hole 150. The large diameter end of the first conical seal 18 and the small diameter end of the second conical seal 19 are located on the same side. The first conical seal 18 and the second conical seal 19 are both made of rubber or other elastic materials.

[0048] Preferably, when installing the gas inlet pipe 1, the air inlet pipe 5, the gas outlet pipe 8 or the air outlet pipe 9, the first conical seal 18 is installed on the outer shell 15. When the position of the gas inlet pipe 1, the air inlet pipe 5, the gas outlet pipe 8 or the air outlet pipe 9 is adjusted, the second conical seal 19 is sleeved on the outside of the first conical seal 18 and fixes the first conical seal 18.

[0049] Preferably, the large diameter end of the first conical seal 18 has a first interference ring 20, which interferes with the first side surface of the housing 15, and the large diameter end of the second conical seal 19 has a second interference ring 21, which interferes with the second side surface of the housing 15, and the first side surface is opposite to the second side surface. Specifically, the first conical seal 18 is fixed to the housing 15 through the first interference ring 20, and the first interference ring 20 and the second interference ring 21 can be installed on the housing 15 by screws or other components, and the first interference ring 20 forms a limiting structure for the small diameter end of the second conical seal 19, and the second interference ring 21 is a limit for the small diameter end of the first conical seal 18. After the first interference ring 20 and the second interference ring 21 are fixed to the housing 15, the first interference ring 20 interferes with the second conical seal 19, and the second interference ring 21 interferes with the first conical seal 18;

[0050] It should be noted that the first and second abutment rings 20 and 21 are made of elastic material, but the elastic modulus of the first and second abutment rings 20 and 21 is greater than the elastic modulus of the first and second conical seals 18 and 19 .

[0051] Preferably, the outer side cover of the gas inlet pipe 1, the air inlet pipe 5, the gas outlet pipe 8 and the air outlet pipe 9 is provided with an O-shaped sealing ring 17. When installing the pipe, the O-shaped sealing ring 17 is first sleeved on the outside of the pipe, then penetrates the inner through hole of the first conical seal 18, and at this time the O-shaped sealing ring 17 is located in the through hole of the first conical seal 18. At this time, the O-shaped sealing ring 17 and the first conical seal 18 form a preliminary positioning of the pipe. Then the pipe is connected with the first communication member 3 or the second communication member 7. During the connection process, the O-shaped sealing ring 17 moves relative to the pipe or the O-shaped sealing ring 17 and the first conical seal 18 deform relative to the outer shell 15 along the length direction of the pipe, thereby adjusting the connection of the pipe with other components. Then the position of the first conical seal 18 is adjusted, and then the second conical seal 19 is installed. The O-shaped sealing ring 17 is in contact with the inner wall of the first conical seal 18. When the second conical seal 19 is not installed, the O-shaped sealing ring 17 realizes preliminary positioning of the pipe and the pipe can move relative to the outer shell 15 during the installation process. After the pipe is installed and the second conical seal 19 is installed, the O-shaped sealing ring 17 can realize stable sealing of the pipe and increase the holding of the pipe. Under the premise of ensuring the sealing performance, the stability of the pipe fixing is increased.

[0052] Specifically, the inner ring of the O-shaped sealing ring 17 is in contact with the outer wall of the pipe, and there is lubricating oil between the pipe and the O-shaped sealing ring. When the O-shaped sealing ring is placed in the first conical seal 18, the outer wall of the O-shaped sealing ring is in contact with the inner wall of the first conical seal 18, and the first conical seal 18 deforms. When the second conical seal is sleeved, the inner wall of the first conical seal 18 is in contact with the pipe, and the outer wall of the second conical seal is in contact with the connecting through hole 150.

[0053] A method for online detection of tetrahydrothiophene concentration in a gas pipeline, using the above device, including sequentially collecting monitoring mode, air cleaning mode, standby mode, and after the standby mode ends, the above three modes are cycled in turn. During the collection monitoring mode, air cleaning mode and standby mode, the monitoring mode is performed.

[0054] The collection monitoring mode includes:

[0055] The power of the first electromagnetic valve 10, the third electromagnetic valve 13 and the tetrahydrothiophene sensor 2 is turned on, the second electromagnetic valve 11 and the fourth electromagnetic valve 14 are turned off, and the air pump 4 is turned on. The gas in the pipeline passes through the flow meter 6 and then passes through the tetrahydrothiophene sensor 2 and is discharged through the gas outlet pipe 8. The tetrahydrothiophene sensor 2 transmits the detected data to the terminal device after taking the average value at a certain interval.

[0056] Air purge modes include:

[0057] Turn off the power of the first solenoid valve 10, the third solenoid valve 13 and the tetrahydrothiophene sensor 2, open the second solenoid valve 11 and the fourth solenoid valve 14, and the power of the tetrahydrothiophene sensor 2, and turn on the air pump 4 to purge the gas in the pipeline and discharge it through the air outlet pipe;

[0058] Standby modes include:

[0059] Turn off the power to the first solenoid valve 10, the second solenoid valve 11, the third solenoid valve 13, the fourth solenoid valve 14, the air pump 4, and the tetrahydrothiophene sensor 2;

[0060] The monitoring mode includes detecting whether there is gas leakage in the closed cavity through the gas sensor 16. If the gas sensor 16 detects gas in the detection cavity, the first solenoid valve 10, the second solenoid valve 11, the third solenoid valve 13 and the fourth solenoid valve 14 and the air pump 4 are closed.

[0061] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0063] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0064] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0065] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for online detection of tetrahydrothiophene concentration in a gas pipeline, comprising a gas inlet pipe (1) and a tetrahydrothiophene sensor (2), characterized in that: It also includes a first connecting piece (3), an air pump (4), and an air intake pipe (5), wherein the air intake pipe (5) and the gas intake pipe (1) are both connected to the air intake end of the first connecting piece (3), the air outlet end of the first connecting piece (3) is connected to the air pump (4) through a pipeline, the air outlet end of the air pump (4) is connected to the flow meter (6) through a pipeline, and the air outlet end of the flow meter (6) is connected to the tetrahydrothiophene sensor (2) through a pipeline; The gas outlet end of the tetrahydrothiophene sensor (2) is connected to a second connecting piece (7) via a pipeline, and further comprises a gas outlet pipe (8) and an air outlet pipe (9) connected to the second connecting piece (7); The gas inlet pipe (1) is provided with a first solenoid valve (10), the air inlet pipe (5) is provided with a second solenoid valve (11), the gas outlet pipe (8) is provided with a third solenoid valve (13), and the air outlet pipe (9) is provided with a fourth solenoid valve (14); The invention also includes a housing (15) having a closed detection cavity, wherein the first solenoid valve (10), the second solenoid valve (11), the first connecting piece (3), the air pump (4), the tetrahydrothiophene sensor (2), the second connecting piece (7), the third solenoid valve (13) and the fourth solenoid valve (14) are all located in the detection cavity, and a gas sensor (16) is provided in the detection cavity; When the detection is completed, the first electromagnetic valve (10) is closed first, and then the gas pump (4) works to pump the gas in front of the gas pump (4) into the gas outlet pipe (8), and then the gas pump (4) and the third electromagnetic valve (13) are closed; When the detection is completed, the first solenoid valve (10) and the third solenoid valve (13) are closed, the second solenoid valve (11) and the fourth solenoid valve (14) are opened, and then the gas residue in the device is removed by gas; After closing the four solenoid valves, the air pump (4) is turned on. If the air pump (4) can be operated and the flow rate detected by the flow meter (6) gradually decreases, then the pipeline before the flow meter (6) is not leaking, that is, the pipeline between the first connecting piece (3) and the air pump (4) and the flow meter (6) is not leaking; if the flow rate detected by the flow meter (6) does not change after the air pump (4) is turned on, then the pipeline before the flow meter (6) is leaking; The elastic sealing assembly comprises a first conical seal (18) and a second conical seal (19), wherein the first conical seal is sleeved on the outside of the gas inlet pipe (1), the air inlet pipe (5), the gas outlet pipe (8) or the air outlet pipe (9), and the second conical seal (19) is sleeved on the outside of the first conical seal (18) and contacts the inner wall of the connecting through hole (150), and the large diameter end of the first conical seal (18) and the small diameter end of the second conical seal (19) are located on the same side; When the gas inlet pipe (1), the air inlet pipe (5), the gas outlet pipe (8) or the air outlet pipe (9) is installed, the first conical seal (18) is installed on the housing (15); when the position of the gas inlet pipe (1), the air inlet pipe (5), the gas outlet pipe (8) or the air outlet pipe (9) is adjusted, the second conical seal (19) is sleeved outside the first conical seal (18) and fixes the first conical seal (18); The first conical seal (18) has a first contact ring (20) at a large diameter end, and the first contact ring (20) contacts a first side surface of the housing (15); the second conical seal (19) has a second contact ring (21) at a large diameter end, and the second contact ring (21) contacts a second side surface of the housing (15), and the first side surface is opposite to the second side surface; The outer sides of the gas inlet pipe (1), the air inlet pipe (5), the gas outlet pipe (8) and / or the air outlet pipe (9) are sleeved with an O-ring (17), and the O-ring (17) contacts the inner wall of the first conical seal (18).

2. The device for online detection of tetrahydrothiophene concentration in a gas pipeline according to claim 1, characterized in that: An air drying element (12) is provided at one end of the air inlet pipe (5) away from the second solenoid valve (11).

3. The device for online detection of tetrahydrothiophene concentration in a gas pipeline according to claim 1, characterized in that: When the gas sensor (16) detects that there is gas in the detection chamber, the first solenoid valve (10), the second solenoid valve (11), the third solenoid valve (13), and the fourth solenoid valve (14) are closed.

4. The device for online detection of tetrahydrothiophene concentration in a gas pipeline according to claim 1, characterized in that: The invention also includes a controller (22), which is connected to the first solenoid valve (10), the second solenoid valve (11), the air pump (4), the third solenoid valve (13), and the fourth solenoid valve (14) and is used to control the opening and closing of the first solenoid valve (10), the second solenoid valve (11), the air pump (4), the third solenoid valve (13), and the fourth solenoid valve (14); the flow meter (6), the tetrahydrothiophene sensor (2), and the gas sensor (16) are connected to the controller (22) and transmit the collected information to the controller (22).

5. The device for online detection of tetrahydrothiophene concentration in a gas pipeline according to claim 1, characterized in that: The air pump (4), the flow meter (6) and the tetrahydrothiophene sensor (2) are fixed on the housing (15); the gas inlet pipe (1), the air inlet pipe (5), the gas outlet pipe (8) and the air outlet pipe (9) are all made of rigid materials; a connecting through hole (150) is provided on the housing (15); the gas inlet pipe (1), the air inlet pipe (5), the gas outlet pipe (8) and the air outlet pipe (9) all pass through different connecting through holes (150); an elastic sealing component is provided between the connecting through hole (150) and the gas inlet pipe (1), the air inlet pipe (5), the gas outlet pipe (8) or the air outlet pipe (9).

6. A method for online detection of tetrahydrothiophene concentration in a gas pipeline, characterized in that: The device according to any one of claims 1 to 5 is used, comprising a collection monitoring mode, an air cleaning mode, and a standby mode, which are performed in sequence, and the three modes are cycled in sequence after the standby mode ends, and the monitoring mode is performed during the collection monitoring mode, the air cleaning mode, and the standby mode, wherein Acquisition monitoring modes include: The power supply of the first solenoid valve (10), the third solenoid valve (13) and the tetrahydrothiophene sensor (2) is turned on, the second solenoid valve (11) and the fourth solenoid valve (14) are turned off, and the gas pump (4) is turned on to allow the gas in the pipeline to pass through the flow meter (6) in a quantitative manner and then pass through the tetrahydrothiophene sensor (2) and the gas outlet pipe (8) to be discharged. The tetrahydrothiophene sensor (2) transmits the detected data to the terminal device; Air purge modes include: Turn off the power of the first solenoid valve (10), the third solenoid valve (13) and the tetrahydrothiophene sensor (2), open the second solenoid valve (11) and the fourth solenoid valve (14), and turn on the air pump (4) to purge the gas in the pipeline and discharge it through the air outlet pipe; Standby modes include: Turn off the power to the first solenoid valve (10), the second solenoid valve (11), the third solenoid valve (13), the fourth solenoid valve (14), the air pump (4), and the tetrahydrothiophene sensor (2); Monitoring modes include: The gas sensor (16) is used to detect whether there is gas leakage in the detection chamber. If the gas sensor (16) detects that there is gas in the detection chamber, the external power supply is turned off, specifically including the power supply of the first solenoid valve (10), the second solenoid valve (11), the third solenoid valve (13), the fourth solenoid valve (14), the air pump (4) and the tetrahydrothiophene sensor (2).

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