Novel tetrahydrothiophene concentration measuring device

Abstract

The utility model discloses a novel tetrahydrothiophene concentration measuring device, which relates to the technical field of tetrahydrothiophene detection and comprises a natural gas pipeline, the rear side of the natural gas pipeline is fixedly connected with an L-shaped pipeline I, and the rear end of an L-shaped pipeline III is fixedly connected with a gas mixing chamber. The rear side of the natural gas pipeline is respectively provided with a gas mixing chamber unit, a compressed air preparation unit, a natural gas decompression preparation unit, a sample gas detection unit, a control unit and a communication unit. Air and natural gas are mixed in equal volume, an aerobic detection environment is created, and the working principle of an electrochemical tetrahydrothiophene detector is matched; according to the electrochemical tetrahydrothiophene concentration detector, the tetrahydrothiophene concentration of the mixed gas is accurately detected, then the tetrahydrothiophene concentration of the natural gas is deduced according to the isovolumetric proportional relation, reliable working conditions are created for the electrochemical tetrahydrothiophene concentration detector, continuous measurement can be achieved, detection data are stable, repeatability is good, and precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of tetrahydrothiophene detection, in particular to a novel device for measuring the concentration of tetrahydrothiophene. Background Art

[0002] From a safety perspective, town gas needs to be odorized. When natural gas leaks, the odorant attached can enable people to quickly detect it, so as to take corresponding safety measures to avoid accidents. Tetrahydrothiophene is an organic compound with the chemical formula C4H8S and is usually used as an odorant for town gas (including liquefied petroleum gas (LPG), liquefied natural gas (LNG), coal gas, pipeline natural gas, etc.). In terms of management, taking pipeline natural gas as an example, the odorant concentration of the natural gas leaving the gate station is required to be not less than 20 mg / Nm 3 , and the odorant concentration of the natural gas at the user end is required to be not less than 8 mg / Nm 3 . Therefore, technically speaking, it is necessary to measure the odorant concentration of natural gas and adjust the odorant addition amount at the gate station in real time according to the measured odorant concentration of the natural gas at the user end.

[0003] Online detection of odorants can use chromatographic analyzers, but they are expensive, require personnel operation, and it is not easy to obtain data in a timely manner and transmit it over the network, which is not convenient for popularization and application. Currently, most of the commonly used tetrahydrothiophene detectors are electrochemistry type. When detecting, they consume oxygen. When using an electrochemistry type tetrahydrothiophene detector, generally, the detector probe is first wetted with air so that the detector probe adsorbs a certain amount of oxygen, and then natural gas is sent to the detector probe to detect its odorant concentration. When the oxygen adsorbed on the detector probe is consumed and reduced to a certain extent, the electrochemical reaction cannot proceed, and the detector loses its detection function. Due to lack of oxygen, the measurement data of the electrochemistry type detector will be severely distorted, with an error of more than 30%, and it is not convenient for online detection. How to use an electrochemistry type tetrahydrothiophene detector to measure the odorant concentration of pipeline gas and achieve online detection has become an urgent problem to be solved currently. For this reason, a novel device for measuring the concentration of tetrahydrothiophene is needed to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to make up for the deficiencies of the prior art and provide a novel device for measuring the concentration of tetrahydrothiophene.

[0005] To achieve the above object, the present utility model provides the following technical solutions: a novel tetrahydrothiophene concentration measuring device, including a natural gas pipeline, a first L-shaped pipeline is fixedly connected to the rear side of the natural gas pipeline, a second L-shaped pipeline is provided at the rear side of the natural gas pipeline, the rear ends of the first L-shaped pipeline and the second L-shaped pipeline are both fixedly connected to a first three-way pipe joint, a third L-shaped pipeline is fixedly connected to the rear end of the first three-way pipe joint, a mixing chamber is fixedly connected to the rear end of the third L-shaped pipeline, a fourth L-shaped pipeline is fixedly connected to the side of the mixing chamber away from the third L-shaped pipeline, a second three-way pipe joint is fixedly connected to the rear end of the fourth L-shaped pipeline, a fifth L-shaped pipeline and a sixth L-shaped pipeline are respectively fixedly connected to the two ends of the second three-way pipe joint, a mixing chamber unit, a compressed air preparation unit, a natural gas pressure reduction preparation unit, a sample gas detection unit, a control unit and a communication unit are respectively provided at the rear side of the natural gas pipeline;

[0006] The mixing chamber unit includes an air inlet solenoid valve installed at the rear end of the second L-shaped pipeline, a natural gas inlet solenoid valve installed at the end of the first L-shaped pipeline away from the natural gas pipeline, a vent exhaust solenoid valve installed at the rear end of the fifth L-shaped pipeline, and a test exhaust solenoid valve installed at the front end of the sixth L-shaped pipeline.

[0007] Preferably, the compressed air preparation unit includes an air filter installed at the front end of the second L-shaped pipeline, an air pump is provided between the air filter and the air inlet solenoid valve, and the air pump is installed on the second L-shaped pipeline.

[0008] Preferably, the natural gas pressure reduction preparation unit includes a natural gas pressure reducing valve installed at the front end of the first L-shaped pipeline, a natural gas pressure stabilizing valve is provided between the natural gas pressure reducing valve and the natural gas inlet solenoid valve, and the natural gas pressure stabilizing valve is installed on the first L-shaped pipeline.

[0009] Preferably, the sample gas detection unit includes a sample gas pressure stabilizing valve and a sample gas flow limiting valve installed in sequence on the sixth L-shaped pipeline, and the sample gas pressure stabilizing valve and the sample gas flow limiting valve are located behind the test exhaust solenoid valve. A detector body is provided at the rear end of the sixth L-shaped pipeline. The detector body is composed of a detector probe and a detector display screen. The detector probe is installed at the rear end of the sixth L-shaped pipeline, and the top end of the detector probe is fixedly connected to the detector display screen. A computer is provided at the rear side of the natural gas pipeline, and the computer is electrically connected to the detector body.

[0010] Preferably, the control unit is composed of a power supply, a PLC, an input / output relay and electrical circuits, and the communication unit is composed of an edge gateway and a communication line.

[0011] Preferably, the control unit is electrically connected to the air inlet solenoid valve, the natural gas inlet solenoid valve, the vent exhaust solenoid valve, the test exhaust solenoid valve, the air pump and the communication unit respectively, and the communication unit is connected to the computer through a wired or wireless network.

[0012] Preferably, the front end of the second L-shaped pipe is a flexible pipe, and the rear end of the second L-shaped pipe is a stainless steel pipe. The first L-shaped pipe, the third L-shaped pipe, the fourth L-shaped pipe, the fifth L-shaped pipe, and the sixth L-shaped pipe are all stainless steel pipes.

[0013] Beneficial effects:

[0014] Compared with the prior art, the novel tetrahydrothiophene concentration measuring device has the following beneficial effects:

[0015] 1. In the present utility model, air and natural gas are mixed in equal volumes. The oxygen content of the mixed gas is stable, which conforms to the working principle and detection conditions of the electro-chemical tetrahydrothiophene concentration detector. Air and natural gas are mixed in equal volumes. The tetrahydrothiophene concentration of natural gas is theoretically twice that of the mixed gas. Two concentration values are simultaneously displayed on the sample gas detection unit. The novel tetrahydrothiophene concentration measuring device creates reliable working conditions for the electro-chemical tetrahydrothiophene concentration detector, can continuously measure, the detection data is stable, the repeatability is good, and the accuracy is high. Description of the drawings

[0016] Figure 1 is a perspective view of the present utility model;

[0017] Figure 2 is a connection relationship diagram of the first L-shaped pipe, the second L-shaped pipe, the first three-way pipe joint, the third L-shaped pipe, the natural gas inlet solenoid valve, the natural gas pressure reducing valve, and the natural gas pressure stabilizing valve in the present utility model;

[0018] Figure 3 is a connection relationship diagram of the fourth L-shaped pipe, the second three-way pipe joint, the fifth L-shaped pipe, the sixth L-shaped pipe, the vent exhaust solenoid valve, and the inspection exhaust solenoid valve in the present utility model;

[0019] Figure 4 is a connection relationship diagram of the second L-shaped pipe, the air inlet solenoid valve, the air pump, and the air filter in the present utility model.

[0020] In the figure: 1, natural gas pipeline; 2, first L-shaped pipeline; 3, second L-shaped pipeline; 4, first three-way pipe joint; 5, third L-shaped pipeline; 6, gas mixing chamber; 7, fourth L-shaped pipeline; 8, second three-way pipe joint; 9, fifth L-shaped pipeline; 10, sixth L-shaped pipeline; 11, gas mixing chamber unit; 111, air intake solenoid valve; 112, natural gas intake solenoid valve; 113, vent exhaust solenoid valve; 114, inspection exhaust solenoid valve; 12, compressed air preparation unit; 121, air pump; 122, air filter; 13, natural gas decompression preparation unit; 131, natural gas pressure reducing valve; 132, natural gas pressure stabilizing valve; 14, sample gas detection unit; 141, sample gas pressure stabilizing valve; 142, sample gas flow limiting valve; 143, detector body; 1431, detector probe; 1432, detector display screen; 144, computer; 15, control unit; 16, communication unit. Detailed implementation mode

[0021] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0022] As Figures 1 to 4As shown in the figure, a new type of tetrahydrothiophene concentration measuring device includes a natural gas pipeline 1. A first L-shaped pipeline 2 is fixedly connected to the rear side of the natural gas pipeline 1. A second L-shaped pipeline 3 is provided at the rear side of the natural gas pipeline 1. A first three-way pipe joint 4 is fixedly connected to the rear ends of the first L-shaped pipeline 2 and the second L-shaped pipeline 3. A third L-shaped pipeline 5 is fixedly connected to the rear end of the first three-way pipe joint 4. A mixing chamber 6 is fixedly connected to the rear end of the third L-shaped pipeline 5. A fourth L-shaped pipeline 7 is fixedly connected to the side of the mixing chamber 6 away from the third L-shaped pipeline 5. A second three-way pipe joint 8 is fixedly connected to the rear end of the fourth L-shaped pipeline 7. A fifth L-shaped pipeline 9 and a sixth L-shaped pipeline 10 are respectively fixedly connected to the two ends of the second three-way pipe joint 8. A mixing chamber unit 11, a compressed air preparation unit 12, a natural gas decompression preparation unit 13, a sample gas detection unit 14, a control unit 15 and a communication unit 16 are respectively provided at the rear side of the natural gas pipeline 1. The compressed air preparation unit 12 includes an air filter 122 installed at the front end of the second L-shaped pipeline 3. An air pump 121 is provided between the air filter 122 and an air intake solenoid valve 111, and the air pump 121 is installed on the second L-shaped pipeline 3. The air pump 121 sucks external air, and the air filter 122 filters and purifies the air, so that the air entering the mixing chamber 6 is fresh and clean air. The natural gas decompression preparation unit 13 includes a natural gas pressure reducing valve 131 installed at the front end of the first L-shaped pipeline 2. A natural gas pressure stabilizing valve 132 is provided between the natural gas pressure reducing valve 131 and a natural gas intake solenoid valve 112, and the natural gas pressure stabilizing valve 132 is installed on the first L-shaped pipeline 2. The natural gas pressure reducing valve 131 can receive a natural gas pressure ≤ 20 MPa. The natural gas pressure stabilizing valve 132 controls the output pressure of natural gas to be 0.1 MPa. The inlet working pressure of the natural gas pressure reducing valve 131 ≤ 20 MPa, and the output pressure is between 0.1 MPa and 0.3 MPa. The inlet working pressure of the natural gas pressure stabilizing valve 132 ≤ 0.8 MPa, and the output pressure adjustment and control are accurate to 0.1 MPa, so that the final pressure of the mixed gas is 0.1 MPa. The theoretical volume mixing ratio of air and natural gas is 1:1. The sample gas detection unit 14 includes a sample gas pressure stabilizing valve 141 and a sample gas flow limiting valve 142 sequentially installed on the sixth L-shaped pipeline 10, and the sample gas pressure stabilizing valve 141 and the sample gas flow limiting valve 142 are located behind a sample sending and exhaust solenoid valve 114. A detector body 143 is provided at the rear end of the sixth L-shaped pipeline 10. The detector body 143 is composed of a detector probe 1431 and a detector display screen 1432. The detector probe 1431 is installed at the rear end of the sixth L-shaped pipeline 10, and the top end of the detector probe 1431 is fixedly connected to the detector display screen 1432. A computer 144 is provided at the rear side of the natural gas pipeline 1, and the computer 144 is electrically connected to the detector body 143. The detector body 143 transmits detection data to the computer 144 through the communication unit 16 via a wired or wireless network. The computer 144 obtains detector data and realizes remote control through the communication unit 16 via a wired or wireless network.The sample gas flow limiting valve 142 can adjust the flow rate of the gas to be measured, making the gas outflow speed uniform, and can maintain for more than one minute (if it cannot be maintained for one minute, the volume of the gas mixing chamber 6 needs to be appropriately increased). The detector body 143 is an electro-chemical type tetrahydrothiophene concentration detector. The detector probe 1431 detects the mixed gas. The detector display screen 1432 has two display channels, and has the function of simultaneously displaying the tetrahydrothiophene concentration of the mixed gas and the tetrahydrothiophene concentration of the pipeline natural gas. The tetrahydrothiophene concentration of the natural gas is calculated based on the tetrahydrothiophene concentration of the mixed gas and the air-fuel volume ratio of 1:1 of the mixed gas. The computer 144 can record and save the measurement data.

[0023] The gas mixing chamber unit 11 includes an air intake solenoid valve 111 installed at the rear end of the second L-shaped pipeline 3. A natural gas intake solenoid valve 112 is installed at the end of the first L-shaped pipeline 2 far from the natural gas pipeline 1. A vent exhaust solenoid valve 113 is installed at the rear end of the fifth L-shaped pipeline 9. A sample delivery exhaust solenoid valve 114 is installed at the front end of the sixth L-shaped pipeline 10. The control unit 15 is composed of a power supply, a PLC, input and output relays, and electrical circuits. The communication unit 16 is composed of an edge gateway and communication lines. The PLC is programmed according to the gas distribution process and the detection process to run automatically and be debugged to have a timing measurement function and a manual immediate measurement function. The control unit 15 controls the air intake solenoid valve 111, the natural gas intake solenoid valve 112, the vent exhaust solenoid valve 113, and the sample delivery exhaust solenoid valve 114, and controls the switching time and sequence. The control unit 15 is electrically connected to the air intake solenoid valve 111, the natural gas intake solenoid valve 112, the vent exhaust solenoid valve 113, the sample delivery exhaust solenoid valve 114, the air pump (121), and the communication unit (16). The communication unit 16 is connected to the computer 144 through a wired or wireless network for convenient centralized control. The front end of the second L-shaped pipeline 3 is a hose, and the rear end of the second L-shaped pipeline 3 is a stainless steel pipe. The first L-shaped pipeline 2, the third L-shaped pipeline 5, the fourth L-shaped pipeline 7, the fifth L-shaped pipeline 9, and the sixth L-shaped pipeline 10 are all stainless steel pipes.

[0024] During operation, since the pressure borne by the detection device is limited, it is necessary to reduce the pressure at the natural gas detection port of the pipeline. For medium-pressure pipelines (pipe pressure ≤ 0.4 MPa), a single-stage pressure reducing valve can be used. For high-pressure pipelines (pipe pressure ≤ 4 MPa), a two-stage pressure reducing valve can be used. For CNG (pipe pressure ≤ 20 MPa) detection, a three-stage pressure reducing valve is required. The pressure after pressure reduction should be stabilized at 100 KPa (0.1 MPa). Open the air intake solenoid valve 111 and the vent exhaust solenoid valve 113, close the natural gas intake solenoid valve 112 and the sample inspection exhaust solenoid valve 114. Control the compressed air preparation unit 12 through the control unit 15 to input fresh air into the L-shaped pipeline two 3. The air enters the mixing chamber 6 and purges the mixing chamber 6. Then close the air intake solenoid valve 111 and the vent exhaust solenoid valve 113, and open the natural gas intake solenoid valve 112 (the natural gas pressure reducing valve 131 and the natural gas pressure stabilizing valve 132 are in a mechanically normally open working state). Introduce the pipeline natural gas containing tetrahydrothiophene into the mixing chamber 6 through the L-shaped pipeline one 2, so that air and natural gas are mixed in equal volume in the mixing chamber 6. The inlet working pressure of the natural gas pressure reducing valve 131 ≤ 20 MPa, and the output pressure is between 0.1 MPa and 0.3 MPa. The inlet working pressure of the natural gas pressure stabilizing valve 132 ≤ 0.8 MPa, and the output pressure is accurately regulated and controlled to 0.1 MPa, so that the final pressure of the mixed gas is 0.1 MPa. Theoretically, the volume mixing ratio of air and natural gas is 1:1. Finally, open the sample inspection exhaust solenoid valve 114 to introduce the mixed gas into the sample gas detection unit 14 for concentration measurement. The communication unit 16 transmits the measured data outward. Furthermore, the device mixes air and natural gas in equal volume, the oxygen content of the mixed gas is stable, which meets the working principle and detection conditions of the electro-chemical tetrahydrothiophene concentration detector. Air and natural gas are mixed in equal volume, and the tetrahydrothiophene concentration of natural gas is theoretically twice that of the mixed gas. The two concentration values are simultaneously displayed on the sample gas detection unit 14. This new type of tetrahydrothiophene concentration measurement device creates reliable working conditions for the electro-chemical tetrahydrothiophene concentration detector, can continuously measure, the detection data is stable, with good repeatability and high accuracy.

[0025] Working principle: Since the pressure borne by the detection device is limited, it is necessary to reduce the pressure at the natural gas detection port of the pipeline. For medium-pressure pipelines (pipe pressure ≤ 0.4 MPa), a single-stage pressure reducing valve can be used. For high-pressure pipelines (pipe pressure ≤ 4 MPa), a two-stage pressure reducing valve can be used. For the detection of CNG (pipe pressure ≤ 20 MPa), a three-stage pressure reducing valve is required. The pressure after pressure reduction should be stabilized at 100 KPa (0.1 MPa). Open the air intake solenoid valve 111 and the vent exhaust solenoid valve 113, close the natural gas intake solenoid valve 112 and the sample delivery exhaust solenoid valve 114, and control the operation of the air pump 121 through the control unit 15. The air pump 121 sucks in outside air, and the air filter 122 filters and purifies the air, so that the air entering the mixing chamber 6 is fresh and clean air. The fresh air is input into the L-shaped pipe two 3, and the air enters the mixing chamber 6, purging the mixing chamber 6. Then close the air intake solenoid valve 111 and the vent exhaust solenoid valve 113, open the natural gas intake solenoid valve 112, and introduce the pipeline natural gas containing tetrahydrothiophene into the mixing chamber 6 through the L-shaped pipe one 2, so that the air and natural gas are mixed in equal volume in the mixing chamber 6. Finally, open the sample delivery exhaust solenoid valve 114, and introduce the mixed gas into the sample gas detection unit 14 for concentration measurement. The sample gas flow limiting valve 142 can adjust the flow rate of the measured gas, making the outflow speed of the gas uniform, and can maintain for more than one minute (if it cannot be maintained for one minute, the volume of the mixing chamber 6 needs to be appropriately increased). The detector body 143 is an electro-chemical tetrahydrothiophene concentration detector. The detector probe 1431 detects the mixed gas. The detector display screen 1432 has two display channels, with the function of simultaneously displaying the tetrahydrothiophene concentration of the mixed gas and the tetrahydrothiophene concentration of the pipeline natural gas. The tetrahydrothiophene concentration of the natural gas is calculated based on the tetrahydrothiophene concentration of the mixed gas and the air-fuel volume ratio of 1:1 of the mixed gas. The computer 144 can record and save the measurement data, and the control unit 15 controls the opening and closing time and sequence of all valves of the mixing chamber unit 11. The communication unit 16 collects the analog data or 485 digital data of the detector through the edge gateway, realizing real-time long-distance data transmission. Furthermore, the device creates an oxygen-containing detection environment by preparing a mixed gas with an equal volume ratio, matching the working principle of the electro-chemical tetrahydrothiophene detector, realizing the accurate detection of the tetrahydrothiophene concentration of the mixed gas, and then deducing the tetrahydrothiophene concentration of the natural gas based on the equal volume ratio relationship. Based on the good repeatability of the new tetrahydrothiophene concentration measurement device in the test, it provides a reliable guarantee basis for the accuracy calibration of the detector.

[0026] In this article, the control unit 15 is connected to the 220V mains power supply. The specific model specifications of each device in this article need to be selected according to the actual specifications of the device, etc. The specific selection calculation method uses the existing technology in this field, so it will not be elaborated in detail.

[0027] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A novel tetrahydrothiophene concentration measuring device, comprising a natural gas pipeline (1), characterized in that: The rear side of the natural gas pipeline (1) is fixedly connected to an L-shaped pipeline (2), and the rear side of the natural gas pipeline (1) is provided with an L-shaped pipeline (3). The rear ends of the L-shaped pipeline (2) and the L-shaped pipeline (3) are both fixedly connected to a three-way pipe joint (4). The rear end of the three-way pipe joint (4) is fixedly connected to an L-shaped pipeline (5). The rear end of the L-shaped pipeline (5) is fixedly connected to a gas mixing chamber (6). The gas mixing chamber (6) is fixedly connected to a side of the L-shaped pipeline (5) away from the L-shaped pipeline (5). An L-shaped pipeline (4) (7) is connected, the rear end of the L-shaped pipeline (4) (7) is fixedly connected to a three-way pipe joint (2) (8), the two ends of the three-way pipe joint (2) (8) are respectively fixedly connected to an L-shaped pipeline (5) (9) and an L-shaped pipeline (6) (10), and the rear side of the natural gas pipeline (1) is respectively provided with a gas mixing chamber unit (11), a compressed air preparation unit (12), a natural gas decompression preparation unit (13), a sample gas detection unit (14), a control unit (15) and a communication unit (16); The mixing chamber unit (11) comprises an air intake solenoid valve (111) installed at the rear end of the L-shaped pipe 2 (3), a natural gas intake solenoid valve (112) is installed at the end of the L-shaped pipe 1 (2) away from the natural gas pipe (1), a venting exhaust solenoid valve (113) is installed at the rear end of the L-shaped pipe 5 (9), and a test exhaust solenoid valve (114) is installed at the front end of the L-shaped pipe 6 (10).

2. A novel tetrahydrothiophene concentration measuring device according to claim 1, characterized in that: The compressed air preparation unit (12) comprises an air filter (122) installed at the front end of the second L-shaped pipe (3), an air pump (121) is provided between the air filter (122) and the air intake solenoid valve (111), and the air pump (121) is installed on the second L-shaped pipe (3).

3. A novel tetrahydrothiophene concentration measuring device according to claim 1, characterized in that: The natural gas pressure reducing preparation unit (13) comprises a natural gas pressure reducing valve (131) installed at the front end of the L-shaped pipeline (2), a natural gas pressure stabilizing valve (132) is provided between the natural gas pressure reducing valve (131) and the natural gas intake solenoid valve (112), and the natural gas pressure stabilizing valve (132) is installed on the L-shaped pipeline (2).

4. A novel tetrahydrothiophene concentration measuring device according to claim 1, characterized in that: The sample gas detection unit (14) comprises a sample gas pressure regulating valve (141) and a sample gas flow limiting valve (142) which are sequentially installed on the L-shaped pipeline (10), and the sample gas pressure regulating valve (141) and the sample gas flow limiting valve (142) are located at the rear of the exhaust solenoid valve (114) to be inspected. A detector body (143) is provided at the rear end of the L-shaped pipeline (10), and the detector body (143) is composed of a detector probe (1431) and a detector display screen (1432). The detector probe (1431) is installed at the rear end of the L-shaped pipeline (10), and the top end of the detector probe (1431) is fixedly connected to the detector display screen (1432). A computer (144) is provided at the rear side of the natural gas pipeline (1), and the computer (144) is electrically connected to the detector body (143).

5. A novel tetrahydrothiophene concentration measuring device according to claim 1, characterized in that: The control unit (15) is composed of a power supply, a PLC, input and output relays and electrical circuits, and the communication unit (16) is composed of an edge gateway and a communication circuit.

6. A novel tetrahydrothiophene concentration measuring device according to claim 5, characterized in that: The control unit (15) is electrically connected to the air intake solenoid valve (111), the natural gas intake solenoid valve (112), the vent exhaust solenoid valve (113), the inspection exhaust solenoid valve (114), the air pump (121) and the communication unit (16), respectively. The communication unit (16) is connected to the computer (144) via a wired or wireless network.

7. A novel tetrahydrothiophene concentration measuring device according to claim 1, characterized in that: The front end of the L-shaped pipe 2 (3) is a hose, and the rear end of the L-shaped pipe 2 (3) is a stainless steel pipe. The L-shaped pipe 1 (2), the L-shaped pipe 3 (5), the L-shaped pipe 4 (7), the L-shaped pipe 5 (9) and the L-shaped pipe 6 (10) are all stainless steel pipes.

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