A multi-sensor online monitoring device for odorizing agents in pipelines

Abstract

The utility model relates to a kind of online monitoring device of odourant pipeline of multiple sensors, including box, control assembly, electrochemical sensor, auxiliary monitoring assembly, main pipeline, first branch pipe, second branch pipe and third branch pipe, the main pipeline is transversely installed in box, first branch pipe and second branch pipe are respectively vertically communicated on main pipeline, third branch pipe is communicated between first branch pipe and second branch pipe, electrochemical sensor is installed on third branch pipe, first solenoid valve is equipped on the first branch pipe between main pipeline and third branch pipe, second solenoid valve is equipped on the second branch pipe between main pipeline and third branch pipe, auxiliary monitoring assembly is installed on main pipeline, control assembly is installed in box, control assembly is respectively with electrochemical sensor, auxiliary monitoring assembly, first solenoid valve, second solenoid valve signal connection.The utility model can effectively avoid electrochemical sensor long time and odourant occur redox reaction and cause sensitivity, accuracy to be influenced.

Description

Technical Field

[0001] This utility model relates to the field of pipeline monitoring technology, specifically to an online monitoring device for odorant pipelines with multiple sensors. Background Technology

[0002] During natural gas transportation, data such as the concentration, pressure, flow rate, temperature, and humidity of odorant within the pipeline are crucial. Excessive concentration leads to resource waste and unpleasant odors, while insufficient concentration fails to provide effective warnings in case of leaks, resulting in serious safety hazards. Currently, online monitoring of odorant concentration in pipelines primarily employs electrochemical sensors directly connected to the pipeline for real-time monitoring. However, since these sensors measure odorant concentration through redox reactions, their probes, constantly positioned within the pipeline, gradually lose their ability to detect odorant, leading to inaccurate data and the inability to maintain continuous online monitoring. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a multi-sensor online monitoring device for odorant pipelines, which can effectively avoid the sensitivity and accuracy of electrochemical sensors being affected by prolonged oxidation-reduction reactions with odorant.

[0004] The technical solution of this utility model is as follows: a multi-sensor online monitoring device for odorant pipelines, comprising a housing, a control component, an electrochemical sensor, an auxiliary monitoring component, a main pipeline, a first branch pipe, a second branch pipe, and a third branch pipe. The main pipeline is installed horizontally in the housing. The first and second branch pipes are vertically connected to the main pipeline, and the third branch pipe is connected between the first and second branch pipes. The electrochemical sensor is installed on the third branch pipe. A first solenoid valve is provided on the first branch pipe between the main pipeline and the third branch pipe, and a second solenoid valve is provided on the second branch pipe between the main pipeline and the third branch pipe. The auxiliary monitoring component is installed on the main pipeline, and the control component is installed in the housing. The control component is connected to the electrochemical sensor, the auxiliary monitoring component, the first solenoid valve, and the second solenoid valve for signal connection.

[0005] Furthermore, the auxiliary monitoring component includes a pressure sensor, a flow sensor, and a temperature and humidity sensor, and the control component is connected to the pressure sensor, flow sensor, and temperature and humidity sensor respectively.

[0006] Furthermore, the pressure sensor, flow sensor, and temperature and humidity sensor are all located on the main pipe between the first branch pipe and the second branch pipe, and a third solenoid valve is provided on the main pipe between the first branch pipe and the second branch pipe.

[0007] Furthermore, the ends of the first and second branch pipes are both located outside the casing, a fourth solenoid valve is provided between the end of the first branch pipe and the third branch pipe, and a fifth solenoid valve is provided between the end of the second branch pipe and the third branch pipe.

[0008] Furthermore, the housing is equipped with a blower, and the output end of the blower is connected to the first branch pipe.

[0009] Furthermore, the first branch pipe is equipped with manual valves at both ends of the third branch pipe, and the second branch pipe is equipped with manual valves at both ends of the third branch pipe.

[0010] Furthermore, the side of the enclosure is equipped with a fan that connects the inside and outside of the enclosure.

[0011] Furthermore, it also includes an observer and a near-infrared spectrometer. The observer is installed in the third branch tube, with glass covers at both the top and bottom. The near-infrared spectrometer is mounted inside the box, with the detection end of the near-infrared spectrometer facing the glass cover.

[0012] Furthermore, the inner side of the box is provided with a support, and the support has a notch that narrows from top to bottom. The near-infrared spectrometer is mounted in the notch, and the output end of the near-infrared spectrometer faces the glass cover.

[0013] Compared with the prior art, the advantages of this utility model are as follows: the electrochemical sensor and the auxiliary monitoring components are respectively set on two pipelines, and the pressure sensor, flow sensor and temperature and humidity sensor perform all-weather normal data monitoring. The odorant concentration monitoring adopts timed monitoring, which can effectively maintain the accuracy of the electrochemical sensor data monitoring and avoid the sensitivity and accuracy of the electrochemical sensor being affected by the oxidation-reduction reaction with the odorant for a long time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 This is a schematic diagram illustrating the working principle of this utility model;

[0018] Figure 4 This is a diagram showing the usage state of the main pipeline of this utility model when it is connected;

[0019] Figure 5 This is a diagram showing the usage state of the main pipeline of this utility model when it is connected to the third branch pipeline;

[0020] Figure 6 This is a diagram showing the usage state of the third branch pipe of this utility model during venting.

[0021] The components include: 1. Main pipe; 2. First branch pipe; 3. Second branch pipe; 4. Third branch pipe; 5. Electrochemical sensor; 6. Pressure sensor; 7. Flow sensor; 8. Temperature and humidity sensor; 9. Control components; 10. Blower; 11. First solenoid valve; 12. Second solenoid valve; 13. Third solenoid valve; 14. Fourth solenoid valve; 15. Fifth solenoid valve; 16. Fan; 17. Bracket; 1701. Notch; 18. Housing; 19. Observation device; 1901. Glass cover; 20. Near-infrared sensor. Detailed Implementation

[0022] To further illustrate the technical means and effects of this utility model in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0023] like Figure 1-6 As shown, a multi-sensor online monitoring device for odorant pipelines includes a housing 18, a control component 9, an electrochemical sensor 5, an auxiliary monitoring component, a main pipeline 1, a first branch pipe 2, a second branch pipe 3, and a third branch pipe 4. The main pipeline 1 is installed horizontally in the housing 18 and is connected to the odorant pipeline. The first branch pipe 2 and the second branch pipe 3 are vertically connected to the main pipeline 1, respectively. The third branch pipe 4 connects the first branch pipe 2 and the second branch pipe 3, thus forming a branch. The electrochemical sensor 5 is installed on the third branch pipe 4. The electrochemical sensor 5 is a prior art device that can monitor the concentration of odorants such as tetrahydrothiophene (THT), thiols (TBM), and ethanethiol (EM). It has high selectivity, reacting only with the target odorant, strong resistance to interference from other gases, flexible measurement range, and a resolution of 0.1 mg / m³. 3This type of device is commonly used in pipeline flow-through probes for real-time online monitoring of whether the odorant concentration in a branch pipe has reached a safe threshold. A first solenoid valve 11 is installed on the first branch pipe 2 between the main pipeline 1 and the third branch pipe 4, and a second solenoid valve 12 is installed on the second branch pipe 3 between the main pipeline 1 and the third branch pipe 4. An auxiliary monitoring component is installed on the main pipeline 1, and a control component 9 is installed inside the housing 18. The control component 9 is manufactured by SUNDRAY and uses an RS485 mains power status monitoring module, enabling long-distance, high-interference differential signal transmission, supporting multi-point communication networks, and possessing high speed and high reliability. The control component 9 is connected to the electrochemical sensor 5, the auxiliary monitoring component, the first solenoid valve 11, and the second solenoid valve 12. Operators use a background management system to instruct the control component 9 to operate the first solenoid valve 11 and the second solenoid valve 12, while simultaneously acquiring data from the electrochemical sensor 5 and the auxiliary monitoring component to ensure that the odorant concentration in the pipeline remains at a normal level.

[0024] In the above embodiments, the auxiliary monitoring components include a pressure sensor 6, a flow sensor 7, and a temperature and humidity sensor 8. The pressure sensor 6 can monitor the gas pressure inside the pipeline to determine the pipeline's sealing performance. Abnormal pressure may indicate a leak or a fault in the odorant injection. The flow sensor 7 can monitor the instantaneous and cumulative flow of natural gas inside the pipeline, dynamically adjusting the odorant injection amount to ensure stable concentration. The temperature and humidity sensor 8 can monitor the ambient temperature and humidity inside the pipeline, thereby compensating for the odorant concentration reading to obtain more accurate data. All of the above belong to the prior art. The control component 9 is connected to the pressure sensor 6, flow sensor 7, and temperature and humidity sensor 8 respectively. The background management system performs appropriate operations after obtaining data through the control component 9. The pressure sensor 6, flow sensor 7, and temperature and humidity sensor 8 are all located on the main pipe 1 between the first branch pipe 2 and the second branch pipe 3. A third solenoid valve 13 is installed on the main pipe 1 between the first branch pipe 2 and the second branch pipe 3. The third solenoid valve 13 can close the main pipe 1, allowing the odorant to flow back to the main pipe 1 after passing through the first branch pipe 2, the third branch pipe 4, and the second branch pipe 3 in sequence, ensuring sufficient flow through the electrochemical sensor 5 and accurate monitoring data. The ends of the first branch pipe 2 and the second branch pipe 3 are both located outside the housing 18. A fourth solenoid valve 14 is installed between the end of the first branch pipe 2 and the third branch pipe 4, and a fifth solenoid valve 15 is installed between the end of the second branch pipe 3 and the third branch pipe 4. When the first solenoid valve 11 and the second solenoid valve 12 are both closed, the fourth solenoid valve 14 and the fifth solenoid valve 15 open, allowing the electrochemical sensor 5 to communicate with the outside environment. This prevents the electrochemical sensor 5 from undergoing an oxidation-reduction reaction with the residual odorant in the pipe when it is normally open, which would cause a rapid decrease in the sensitivity and accuracy of the electrochemical sensor 5. The housing 18 is equipped with a blower 10, the output of which is connected to the first branch pipe 2. With the first solenoid valve 11 and the second solenoid valve 12 closed, and the fourth solenoid valve 14 and the fifth solenoid valve 15 open, the blower 10 can use airflow to vent the odorant from the first branch pipe 2, the third branch pipe 4, and the second branch pipe 3, further reducing the redox reaction between the electrochemical sensor 5 and the odorant. Manual valves are provided at both ends of the first branch pipe 2 and the second branch pipe 3, improving the safety of the device. These valves allow for manual closure in emergencies, and the multiple manual valves also facilitate maintenance of the core monitoring components on the third branch pipe 4. A fan 16 is located on the side of the housing 18, connecting the inside and outside of the housing 18. This fan can dissipate heat generated by the control component 9 and also vent odorant leaks outside the housing 18, allowing for timely detection and smelling by staff.

[0025] This device also includes an observer 19 and a near-infrared spectrometer. The observer 19 is installed in the third branch pipe 4, and both ends of the observer 19 are glass covers 1901. The near-infrared spectrometer is mounted inside the housing 18, with its detection end facing the glass cover 1901. The near-infrared spectrometer is a handheld device from Shanghai Huijing Technology, which has a built-in optical sensor. When aligned with the glass cover 1901, it indirectly calculates the concentration using the molecular absorption spectrum characteristics of the odorant, featuring non-contact measurement and avoiding sensor corrosion by the odorant. After long-term use, to ensure the accuracy of the near-infrared spectrometer monitoring data, the observer 19 needs to be periodically removed for cleaning. The two ends of the observer 19 are connected to the pipe by bolts, making disassembly and assembly convenient and quick. Because the near-infrared spectrometer is relatively expensive, it is usually used for complementary verification with the electrochemical sensor 5 and is not permanently housed in the housing 18. Verification and calibration can be performed by the near-infrared spectrometer during staff inspections. The handheld near-infrared spectrometer is also convenient to carry and use. The inner side of the housing 18 is provided with a bracket 17, which has a notch 1701 that narrows from top to bottom. The near-infrared spectrometer is mounted in the notch 1701, with the output end of the near-infrared spectrometer facing the glass cover 1901. The bracket 17 provides stable support for the near-infrared spectrometer, ensuring a stable and reliable environment during near-infrared spectrometer monitoring. Sponge or rubber pads can be pasted into the notch 1701 to further improve the stability of the near-infrared spectrometer when mounted in the notch 1701.

[0026] Description of the working principle of this utility model:

[0027] The main pipeline 1 of this device is connected to the odorant pipeline. All manual valves are in the open state. The first solenoid valve 11 and the second solenoid valve 12 are normally closed, and the third solenoid valve 13, the fourth solenoid valve 14, and the fifth solenoid valve 15 are normally open. The pressure sensor 6, the flow sensor 7, and the temperature and humidity sensor 8 perform normal monitoring, and the data is collected by the control component 9 and uploaded to the background management system. Every 12 hours, the background management system automatically monitors the concentration of odorant passing through this device according to instructions. First, it closes the fourth solenoid valve 14 and the fifth solenoid valve 15, then opens the first solenoid valve 11 and the second solenoid valve 12, and then closes the third solenoid valve 13, allowing the odorant to flow through the third branch pipe 4 at full flow. The control component 9 collects the data from the electrochemical sensor 5 and uploads it to the background management system to achieve online monitoring of various pipeline data of the odorant. After the electrochemical sensor 5 completes its monitoring, it first opens the third solenoid valve 13, then closes the first solenoid valve 11 and the second solenoid valve 12, and then opens the fourth solenoid valve 14 and the fifth solenoid valve 15, allowing the residual odorant in the pipeline to be naturally released outside the housing 18. After 5 minutes of natural release, the blower 10 is started to further vent the residual odorant in the pipeline, so as to avoid continuous oxidation-reduction reaction between the electrochemical sensor 5 and the odorant as much as possible. During weekly routine inspections, staff can use a near-infrared spectrometer to verify and calibrate the device. The near-infrared spectrometer is inserted upside down into notch 1701, with its monitoring end aligned with the glass cover 1901. The odorant concentration is calculated using the built-in optical sensor of the near-infrared spectrometer, complementing the electrochemical sensor 5. The device is designed with the electrochemical sensor 5 and auxiliary monitoring components installed on separate pipelines. Pressure sensor 6, flow sensor 7, and temperature and humidity sensor 8 provide continuous, 24 / 7 data monitoring. Odorant concentration monitoring is performed at set intervals, effectively maintaining the accuracy of the data from the electrochemical sensor 5 and preventing the sensor's sensitivity and accuracy from being affected by prolonged redox reactions with the odorant.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-sensor online monitoring device for odorant pipelines, comprising a housing, a control component, an electrochemical sensor, an auxiliary monitoring component, a main pipeline, a first branch pipe, a second branch pipe, and a third branch pipe, characterized in that: The main pipeline is installed horizontally in the housing. The first and second branch pipes are vertically connected to the main pipeline. The third branch pipe is connected between the first and second branch pipes. The electrochemical sensor is installed on the third branch pipe. A first solenoid valve is installed on the first branch pipe between the main pipeline and the third branch pipe. A second solenoid valve is installed on the second branch pipe between the main pipeline and the third branch pipe. The auxiliary monitoring component is installed on the main pipeline. The control component is installed in the housing. The control component is connected to the electrochemical sensor, the auxiliary monitoring component, the first solenoid valve, and the second solenoid valve.

2. The multi-sensor online monitoring device for odorant pipelines according to claim 1, characterized in that: The auxiliary monitoring components include a pressure sensor, a flow sensor, and a temperature and humidity sensor, and the control components are respectively connected to the pressure sensor, flow sensor, and temperature and humidity sensor.

3. The multi-sensor online monitoring device for odorant pipelines according to claim 2, characterized in that: The pressure sensor, flow sensor, and temperature and humidity sensor are all located on the main pipe between the first branch pipe and the second branch pipe, and a third solenoid valve is installed on the main pipe between the first branch pipe and the second branch pipe.

4. The multi-sensor online monitoring device for odorant pipelines according to claim 1, characterized in that: The ends of the first and second branch pipes are both located outside the box. A fourth solenoid valve is provided between the end of the first branch pipe and the third branch pipe, and a fifth solenoid valve is provided between the end of the second branch pipe and the third branch pipe.

5. The multi-sensor online monitoring device for odorant pipelines according to claim 4, characterized in that: The housing is equipped with a blower, and the output end of the blower is connected to the first branch pipe.

6. The multi-sensor online monitoring device for odorant pipelines according to claim 1, characterized in that: The first branch pipe is equipped with manual valves at both ends of the third branch pipe, and the second branch pipe is equipped with manual valves at both ends of the third branch pipe.

7. The multi-sensor online monitoring device for odorant pipelines according to claim 1, characterized in that: The side of the enclosure is equipped with a fan that connects the inside and outside of the enclosure.

8. The multi-sensor online monitoring device for odorant pipelines according to claim 1, characterized in that: It also includes an observer and a near-infrared spectrometer. The observer is installed in the third branch tube, and both the upper and lower ends of the observer are glass covers. The near-infrared spectrometer is mounted inside the box, with the detection end of the near-infrared spectrometer facing the glass cover.

9. The multi-sensor online monitoring device for odorant pipelines according to claim 8, characterized in that: The box is equipped with a support frame with a notch that narrows from top to bottom. The near-infrared spectrometer is mounted in the notch, and the output end of the near-infrared spectrometer faces the glass cover.

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