Natural gas on-line analysis device

Abstract

The utility model discloses a natural gas on -line analysis device, including sampling valve, sampling pipeline, three -way electromagnetic valve, reflux pipeline, reflux valve, booster valve, on -line analysis appearance and pretreatment pipeline, wherein, sampling valve and reflux valve are respectively communicated and set up on natural gas pipeline, one end of sampling pipeline is communicated and set up on sampling valve, and the other end of sampling pipeline is linked with three -way electromagnetic valve first port intercommunication, one end of reflux pipeline is linked with three -way electromagnetic valve's second port intercommunication, and the other end of reflux pipeline is linked with reflux valve intercommunication, and booster valve is in series and is established on reflux pipeline, on -line analysis appearance is communicated with three -way electromagnetic valve's third port intercommunication through pretreatment pipeline, and three -way electromagnetic valve is used for switching sampling pipeline and pretreatment pipeline or with reflux pipeline intercommunication, thereby, realize the real -time circulation of sample gas and the real -time nature of sample gas's collection, avoid sample gas stagnation in sampling pipeline, influence analysis data, improve the accuracy and real -time nature of detection.

Description

Technical Field

[0001] This utility model relates to the field of natural gas analysis technology, and in particular to an online natural gas analysis device. Background Technology

[0002] In the production, transportation and application of natural gas, online natural gas analysis devices play a crucial role in real-time monitoring of natural gas composition and quality. As a pre-processing step of online analysis devices, the performance of the sampling system directly affects the accuracy and reliability of the analysis results.

[0003] Currently, most sampling procedures rely on manually setting fixed sampling cycles or simple time-series control, transporting natural gas samples through pipelines to analyzers for component detection. During non-analysis periods (such as when the analyzer is on standby or operating intermittently), the sampling pipeline is in a static, closed state, causing the sample gas to stagnate within the pipeline. Since natural gas contains light hydrocarbon components such as methane and ethane, as well as heavy hydrocarbons and water vapor, these components are prone to natural separation due to density differences when left stagnant (e.g., light components volatilize, heavy components deposit). These phenomena directly lead to deviations in the composition of the sample gas analyzed later from the original gas source, failing to accurately reflect the real-time composition of the natural gas and significantly reducing the accuracy of the analytical results.

[0004] Furthermore, the sample gas can only flow in one direction within the analyzer in the pipeline. Under low flow rate conditions (such as long-distance transport or low-flow sampling), local resistance components such as pipeline bends and valves can easily create airflow vortices or turbulence, causing some sample gas to remain trapped in dead zones (i.e., "dead volumes") for extended periods. The sample gas within the dead volume cannot be replaced by fresh gas flow, and its composition gradually deviates from the mainstream gas over time, becoming a potential source of analytical error, further compromising the representativeness of the sample gas, and reducing the real-time performance of the analysis. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, one objective of this utility model is to propose an online natural gas analysis device that enables real-time circulation of sample gas and real-time sample gas collection, avoids sample gas stagnation in the sampling pipeline, which affects the analysis data, and improves the accuracy and real-time performance of the detection.

[0007] To achieve the above objectives, this utility model proposes an online natural gas analysis device, comprising a sampling valve, a sampling pipeline, a three-way solenoid valve, a return pipeline, a return valve, a booster valve, an online analyzer, and a pretreatment pipeline. The sampling valve and the return valve are respectively connected to a natural gas pipeline. One end of the sampling pipeline is connected to the sampling valve, and the other end is connected to the first port of the three-way solenoid valve. One end of the return pipeline is connected to the second port of the three-way solenoid valve, and the other end is connected to the return valve. The booster valve is connected in series on the return pipeline. The online analyzer is connected to the third port of the three-way solenoid valve through the pretreatment pipeline. The three-way solenoid valve is used to switch the connection between the sampling pipeline and the pretreatment pipeline or the return pipeline.

[0008] This utility model discloses an online natural gas analysis device. It controls a three-way solenoid valve to switch the connection between the sampling pipeline and the pretreatment pipeline or the return pipeline. The three-way solenoid valve is switched to open the passage between the sampling pipeline and the return pipeline. After the sample gas enters the sampling pipeline through the sampling valve, it is diverted to the return pipeline by the three-way solenoid valve, pressurized by the booster valve, and then returned to the natural gas pipeline through the return valve, forming a closed-loop circulation circuit. Under circulation conditions, the sample gas in the sampling pipeline is continuously replaced by fresh gas, avoiding component deviations caused by stagnation. This ensures that the gas in the sampling pipeline is consistent with the state in the natural gas pipeline during the next sampling, allowing the online analyzer to guarantee that the gas in the sampling pipeline is the gas sampled in real time during sampling. This avoids sampling lag, ensures the real-time nature of the sample gas, and thus improves the accuracy of the online analyzer's detection results. In addition, the pressure can be increased by adjusting the booster valve to accelerate the return flow rate, quickly returning the residual sample gas in the sampling and return pipelines to the natural gas pipeline. This prevents the sample gas from stagnating and causing changes in composition, ensuring the real-time performance and accuracy of the next sampling. It also avoids the situation of "dead volume" in the sample gas under low flow rate conditions, further improving the accuracy of the online analyzer's detection results. The three-way solenoid valve is switched to open the sampling pipeline and the pretreatment pipeline. Since the gas in the sampling pipeline is always in a flowing state, there will be no dead gas situation. After switching the pipeline path, the gas can directly enter the online analyzer for analysis through the pretreatment pipeline.

[0009] In addition, the online natural gas analysis device proposed in the application may also have the following additional technical features:

[0010] Specifically, a sampling probe is installed between the sampling pipeline and the sampling valve. The sampling probe is mounted on the sampling valve, and the probe of the sampling probe extends through the sampling valve into the natural gas pipeline. The end of the sampling probe away from the sampling valve is connected to the sampling pipeline.

[0011] Specifically, it also includes a particulate filter, a pressure reducing valve, and a membrane filter, wherein the particulate filter, the pressure reducing valve, and the membrane filter are connected in series on the pretreatment pipeline, and the particulate filter, the pressure reducing valve, and the membrane filter are sequentially connected from the three-way solenoid valve toward the online analyzer.

[0012] Specifically, it also includes a first ball valve and a second ball valve, wherein the first ball valve and the second ball valve are both connected in series on the pretreatment pipeline, the first ball valve is connected to the three-way solenoid valve, and the particulate filter and the pressure reducing valve are arranged between the first ball valve and the second ball valve.

[0013] Specifically, it also includes a solenoid valve, which is connected in series on the pretreatment pipeline and is located between the second ball valve and the membrane filter.

[0014] Specifically, it also includes a first three-way ball valve, a second three-way ball valve, and a backup pipeline, among which,

[0015] The first three-way ball valve and the second three-way ball valve are respectively connected in series on the pretreatment pipeline. The first three-way ball valve is connected to the second ball valve, and the second three-way ball valve is connected to the membrane filter. The first three-way ball valve, the solenoid valve and the second three-way ball valve are connected in sequence.

[0016] One end of the backup pipeline is connected to the first three-way ball valve, and the other end of the backup pipeline is connected to the second three-way ball valve.

[0017] Specifically, it also includes a controller, which is connected to the online analyzer, the solenoid valve, and the three-way solenoid valve, respectively.

[0018] Specifically, it also includes a sampling pipeline, one end of which is connected to the exhaust port of the online analyzer, and the other end of which is connected to the external sampling main pipe.

[0019] Specifically, it also includes an injector, which is connected in series on the surveying pipeline.

[0020] Specifically, it also includes an electric heat tracing and insulation tape, which is installed on the sampling pipeline. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of an online natural gas analysis device according to an embodiment of the present invention.

[0024] As shown in the figure:

[0025] 1. Sampling valve; 2. Sampling pipeline; 3. Three-way solenoid valve; 4. Return pipeline; 5. Return valve; 6. Pressure booster valve; 7. Online analyzer; 8. Pretreatment pipeline; 9. Particulate filter; 10. Pressure reducing valve; 11. Membrane filter; 12. First ball valve; 13. Second ball valve; 14. Solenoid valve; 15. First three-way ball valve; 16. Second three-way ball valve; 17. Backup pipeline; 18. Controller; 19. Electric heat tracing insulation tape; 20. Sampling pipeline; 21. Injector; 100. Sampling probe; 200. Natural gas pipeline; 201. Sampling main pipe. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0028] The following describes an embodiment of the online natural gas analysis device with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the online natural gas analysis device of this utility model embodiment may include a sampling valve 1, a sampling pipeline 2, a three-way solenoid valve 3, a return pipeline 4, a return valve 5, a booster valve 6, an online analyzer 7, and a pretreatment pipeline 8.

[0030] The sampling valve 1 and the return valve 5 are respectively connected to the natural gas pipeline 200. The sampling valve 1 is used to sample the natural gas flowing through the natural gas pipeline 200, while the return valve 5 is used to introduce the natural gas in the return pipeline 4 into the natural gas pipeline 200.

[0031] One end of the sampling pipeline 2 is connected to the sampling valve 1, and the other end of the sampling pipeline 2 is connected to the first port of the three-way solenoid valve 3. One end of the return pipeline 4 is connected to the second port of the three-way solenoid valve 3, and the other end of the return pipeline 4 is connected to the return valve 5. The pressure boosting valve 6 is connected in series on the return pipeline 4.

[0032] When natural gas flows through the sampling pipeline 2 and the return pipeline 4, it is affected by friction from the inner wall of the pipeline and local resistance from pipe fittings (such as elbows, three-way solenoid valves 3, etc.), resulting in pressure loss. By setting up a pressure booster valve 6, these pressure losses can be compensated, providing sufficient power for the flow of natural gas in the sampling pipeline 2 and the return pipeline 4. This ensures that the natural gas can smoothly pass through the return pipeline 4 and be reintroduced into the natural gas pipeline 200 via the return valve 5, avoiding problems such as poor or even stagnant return due to insufficient pressure. Furthermore, by adjusting the opening of the pressure booster valve 6, the flow rate of natural gas in the return pipeline 4 can be flexibly controlled. This ensures that the sample gas does not stagnate or change composition due to excessively slow flow in the sampling pipeline 2 and the return pipeline 4, while also preventing excessively fast flow from affecting analytical accuracy or causing excessive impact on the pipeline.

[0033] The online analyzer 7 is connected to the third port of the three-way solenoid valve 3 via the pretreatment pipeline 8. The three-way solenoid valve 3 is used to switch the connection between the sampling pipeline 2 and the pretreatment pipeline 8 or the reflux pipeline 4. The online analyzer 7 can be one of the following: an online chromatographic analyzer, an online water dew point analyzer, an online hydrocarbon dew point analyzer, or an online hydrogen sulfide analyzer. Taking an online chromatographic analyzer as an example: the online analyzer 7 can be an Emerson X570, ABB 8206, PROGC from Juguang Technology, or the GW-ZXSP smart eye independently developed by the National Pipeline Network, etc., which can perform simultaneous analysis of components and multiple parameters. Since this is existing technology, it will not be elaborated further here.

[0034] It should be noted that the diameter of the pretreatment line 8 is typically smaller than that of the sampling line 2 (for example, the sampling line 2 is a φ1 / 4 inch stainless steel pipe, while the pretreatment line 8 is a φ1 / 8 inch stainless steel pipe). This dimensional difference aims to optimize gas flow and reduce pressure loss in the pretreatment stage. To ensure the sealing and fluid compatibility of the interface between the pretreatment line 8 and the three-way solenoid valve 3, a matching adapter must be used for the transition connection when the two are connected. As this is existing technology, it will not be elaborated further here.

[0035] Specifically, during operation, sampling valve 1, return valve 5, and booster valve 6 remain open by default to maintain the continuity of the natural gas sample circulation loop. The three-way solenoid valve 3 is configured to dynamically switch between the following two operating conditions based on a control signal:

[0036] a) Under cyclic operating conditions, when the online analyzer 7 completes a single test and enters standby mode, the three-way solenoid valve 3 switches to open the sampling line 2 and the return line 4. After the sample gas enters the sampling line 2 through the sampling valve 1, it is diverted to the return line 4 through the three-way solenoid valve 3, and after being pressurized by the booster valve 6, it returns to the natural gas pipeline 200 through the return valve 5, forming a closed-loop circulation circuit.

[0037] Under cyclic operation, the sample gas in sampling pipeline 2 is continuously replaced by fresh gas, avoiding component deviation caused by stagnation. This ensures that the gas in sampling pipeline 2 is consistent with the state in natural gas pipeline 200 during the next sampling, so that the online analyzer 7 can guarantee that the gas in sampling pipeline 2 is the gas sampled in real time when sampling, avoiding sampling lag and ensuring the real-time nature of the sample gas, thereby improving the accuracy of the detection results of the online analyzer 7.

[0038] In addition, the pressure can be increased by adjusting the booster valve 6 to accelerate the return speed, so that the sample gas remaining in the sampling pipeline 2 and the return pipeline 4 can be quickly returned to the natural gas pipeline 200. This prevents the sample gas from stagnating and causing changes in composition, ensuring the real-time performance and accuracy of the next sampling. At the same time, it avoids the situation of "dead volume" of sample gas under low flow rate conditions, further improving the accuracy of the detection results of the online analyzer 7.

[0039] (b) During sampling, when the online analyzer 7 starts the detection program, the three-way solenoid valve 3 switches to open the sampling line 2 and the pretreatment line 8. At this time, the natural gas sample passes sequentially through the sampling valve 1, sampling line 2, three-way solenoid valve 3, and pretreatment line 8 into the online analyzer 7 for component analysis. Under this condition, the sample gas maintains unidirectional flow in the sampling line 2, ensuring that the analyzer acquires a real-time sampled gas sample.

[0040] The control signal can be generated through manual intervention or automatic timing. Manual intervention is when the operator manually triggers the switching command according to the process requirements; while automatic timing is generated by the controller 18 based on a preset time interval (such as every 5 minutes) or process parameters (such as flow rate and pressure fluctuation thresholds).

[0041] It should be noted that in the existing technology, most of the gas retention is concentrated in the sampling pipeline 2. Since the sampling pipeline 2 is relatively long, although there is also gas retention in the pretreatment pipeline 8, the pipeline is relatively short and has a small diameter, so it has little impact on the detection of the online analyzer 7. The main impact is still on the gas in the sampling pipeline 2. Therefore, the gas retention problem in the sampling pipeline 2 is the core factor restricting the accuracy of detection.

[0042] Therefore, this device achieves dynamic circulation sampling of sample gas through the periodic switching of the three-way solenoid valve 3, and works with the pressure boosting valve 6 to maintain pipeline pressure, effectively preventing sample gas from stagnating and depositing in the sampling pipeline 2 and the return pipeline 4, and ensuring the real-time performance and accuracy of the detection data of the online analyzer 7.

[0043] In one embodiment of this utility model, such as Figure 1 As shown, a sampling probe 100 is installed between the sampling pipeline 2 and the sampling valve 1. The sampling probe 100 is installed on the sampling valve 1, and the probe of the sampling probe 100 extends through the sampling valve 1 into the natural gas pipeline 200. The end of the sampling probe 100 away from the sampling valve 1 is connected to the sampling pipeline 2.

[0044] It should be noted that the sampling probe 100 can be a GENIE brand sampling probe with model GRP-750, which means that the sampling probe 100 has a pressure reduction function.

[0045] In the above scheme, the medium inside the natural gas pipeline 200 is usually under high pressure. Direct sampling is not only difficult to operate, but may also damage downstream equipment or cause safety risks due to excessive pressure. The probe of the sampling probe 100 can be directly inserted into the natural gas pipeline 200 to accurately obtain a sample of the actual medium inside the pipeline. Compared with sampling solely using the sampling valve 1, it can collect representative sample gas more quickly and effectively. At the same time, the sampling probe 100 has a built-in pressure reducing function, which can reduce the pressure of the natural gas medium, providing a pressure buffer for the entire device, reducing the probability of device damage, and ensuring the safe and stable operation of the device.

[0046] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analyzer also includes a particulate filter 9, a pressure reducing valve 10, and a membrane filter 11. The particulate filter 9, the pressure reducing valve 10, and the membrane filter 11 are connected in series on the pretreatment pipeline 8, and are sequentially connected from the three-way solenoid valve 3 toward the online analyzer 7.

[0047] It should be noted that the pretreatment pipeline 8 consists of multiple connecting pipes. "Series connection" means that the head and tail ends of the particulate filter 9 are connected to adjacent connecting pipes via flanges, and the two connecting pipes form a single, continuous, closed channel through the internal flow path of the particulate filter 9. The sample gas must be forced and exclusively flow through the particulate filter 9 in the pretreatment pipeline 8 to form a single, continuous channel. Similarly, the pressure reducing valve 10 and the membrane filter 11 also adopt this design.

[0048] In the above scheme, the particulate filter 9 serves as the first line of defense, which can filter out solid particulate impurities such as dust and rust in natural gas, preventing these impurities from entering subsequent components, avoiding wear or blockage of the pressure reducing valve 10, membrane filter 11 and online analyzer 7, and extending the service life of the equipment.

[0049] The pressure reducing valve 10 is located after the particulate filter 9, which can further reduce the pressure of the sample gas after preliminary filtration and stabilize it to the working pressure range required by the online analyzer 7, ensuring that the online analyzer 7 works under constant pressure conditions and improving the repeatability and accuracy of the test results.

[0050] As the final barrier, the membrane filter 11 can trap smaller particles and droplets, and even remove some gaseous contaminants, further purifying the sample gas and ensuring the purity of the sample gas entering the online analyzer 7, thus reducing the interference of impurities on the analysis results.

[0051] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analysis device also includes a first ball valve 12 and a second ball valve 13. The first ball valve 12 and the second ball valve 13 are both connected in series on the pretreatment pipeline 8. The first ball valve 12 is connected to the three-way solenoid valve 3. The particulate filter 9 and the pressure reducing valve 10 are arranged between the first ball valve 12 and the second ball valve 13.

[0052] In the above scheme, by setting the first ball valve 12 and the second ball valve 13, the pressure reducing valve 10 and the particulate filter 9 in the pretreatment pipeline 8 can be divided into an independent area. This makes it convenient to only close the corresponding first ball valve 12 and the second ball valve 13 when repairing or replacing the particulate filter 9 and the pressure reducing valve 10, without interrupting the operation of the entire device.

[0053] In addition, the first ball valve 12 and the second ball valve 13 work together to achieve fine adjustment of the gas flow rate in the pretreatment pipeline 8, reduce the impact of fluctuations, and ensure the stability of the online analyzer 7 during detection.

[0054] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analysis device also includes a solenoid valve 14, which is connected in series on the pretreatment pipeline 8 and is located between the second ball valve 13 and the membrane filter 11.

[0055] In the above scheme, in an emergency such as when a leak or pressure exceeds the limit is detected, the solenoid valve 14 can be immediately closed to quickly cut off the pretreatment pipeline 8, prevent natural gas leakage, and ensure the safety of the device. The control can be manual or the solenoid valve 14 can be connected to an external gas leak detector. When the external gas leak detector detects a gas leak, the solenoid valve 14 can be directly controlled to close.

[0056] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analysis device also includes a first three-way ball valve 15, a second three-way ball valve 16, and a backup pipeline 17.

[0057] The first three-way ball valve 15 and the second three-way ball valve 16 are respectively connected in series on the pretreatment pipeline 8. The first three-way ball valve 15 is connected to the second ball valve 13, and the second three-way ball valve 16 is connected to the membrane filter 11. The first three-way ball valve 15, the solenoid valve 14 and the second three-way ball valve 16 are connected in sequence. One end of the spare pipeline 17 is connected to the first three-way ball valve 15, and the other end of the spare pipeline 17 is connected to the second three-way ball valve 16.

[0058] In the above scheme, the first three-way ball valve 15, the second three-way ball valve 16, and the backup pipeline 17 are a redundant design. That is, the backup pipeline 17 provides a backup flow path for the sample gas in the pretreatment pipeline 8. When the solenoid valve 14 is damaged and needs to be replaced or repaired, the flow direction of the sample gas can be changed by controlling the first three-way ball valve 15 and the second three-way ball valve 16, so that the sample gas flows through the first three-way ball valve 15, the backup pipeline 17, and then through the second three-way ball valve 16 into the pretreatment pipeline 8. In other words, the sample gas does not pass through the solenoid valve 14, and there is no need to interrupt the operation of the natural gas pipeline, thereby improving the reliability and continuity of the device.

[0059] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analysis device also includes a controller 18, which is connected to the online analyzer 7, the solenoid valve 14 and the three-way solenoid valve 3 respectively. The controller 18 can be electrically connected to the online analyzer 7, the solenoid valve 14 and the three-way solenoid valve 3 by means of wire connection, or the controller 18 can also be signal connected to the online analyzer 7, the solenoid valve 14 and the three-way solenoid valve 3 by means of wireless communication.

[0060] Specifically, the controller 18, through integrated closed-loop feedback control logic, can precisely regulate the solenoid valve 14 and the three-way solenoid valve 3 with millisecond-level response based on real-time status signals (such as component data, fault codes, and flow / pressure fluctuation thresholds) output by the online analyzer 7. Compared to the traditional manual intervention mode, this improves response speed and reduces labor costs.

[0061] For example, when the online analyzer 7 triggers an alarm signal (e.g., a specific fault code appears), it immediately transmits the signal to the controller 18. Upon receiving the signal, the controller 18 quickly controls the solenoid valve 14 to close, thereby effectively avoiding invalid sampling operations and the resulting waste of resources.

[0062] For example, the controller 18 can precisely control the three-way solenoid valve 3 based on the real-time dynamic changes in the status of the online analyzer 7, thereby achieving dynamic adjustment of the sampling frequency or flexible switching of the sampling path, ensuring the accuracy and efficiency of the entire sampling and control process.

[0063] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analysis device also includes a sampling pipeline 20, one end of which is connected to the exhaust port of the online analyzer 7, and the other end of which is connected to the external sampling main pipe 201.

[0064] In the above scheme, the exhaust gas discharged after the online analyzer 7 completes detection is centrally discharged to the external discharge main pipe 201 through the discharge pipe 20, and then discharged to the high altitude through the discharge main pipe 201, so as to avoid the accumulation of exhaust gas near the device and reduce safety risks.

[0065] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analysis device also includes an injector 21, which is connected in series on the sampling pipeline 20.

[0066] In the above scheme, the ejector 21 utilizes the Venturi effect to generate negative pressure, accelerating the discharge of waste gas in the sampling pipeline 20, ensuring rapid discharge of waste gas, and reducing interference from residual gas to subsequent analysis. Furthermore, when the pressure in the sampling main pipe 201 fluctuates, the ejector 21 can prevent waste gas from flowing back into the online analyzer 7, protecting the safety of the device.

[0067] In one embodiment of this utility model, such as Figure 1 As shown, the online natural gas analysis device also includes an electric heat tracing and insulation belt 19, which is installed on the sampling pipeline 2.

[0068] In the above scheme, by setting up an electric heat tracing and insulation belt 19 to heat and insulate the sampling pipeline 2, heavy components in natural gas (such as alkanes and water vapor) are prevented from condensing or precipitating in a low-temperature environment, ensuring the stability of the sample gas composition and maintaining a constant sample gas temperature, reducing volume expansion or contraction caused by temperature changes, and further improving the accuracy of gas composition detection by the online analyzer 7.

[0069] Furthermore, in order to improve the heating effect of the electric heat tracing insulation tape 19 on the sampling pipeline 2, the electric heat tracing insulation tape 19 can be wound around the sampling pipeline 2 in a serpentine manner.

[0070] If an instruction manual is required, all pipe connection points mentioned in the document should be sealed. Taking the connection between sampling pipe 2 and three-way solenoid valve 3 as an example, it is essential to ensure a sealed connection between the two. Specific forms of sealing connection include, but are not limited to, threaded sealing connections, flange sealing connections, and compression fitting sealing connections. In actual operation, operators can choose the appropriate method based on the specific circumstances.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An on-line natural gas analysis apparatus characterized by comprising: This includes sampling valves, sampling pipelines, three-way solenoid valves, reflux pipelines, reflux valves, booster valves, online analyzers, and pretreatment pipelines. The sampling valve and the reflux valve are respectively connected to the natural gas pipeline; One end of the sampling pipeline is connected to the sampling valve, and the other end of the sampling pipeline is connected to the first port of the three-way solenoid valve. One end of the return pipeline is connected to the second port of the three-way solenoid valve, and the other end of the return pipeline is connected to the return valve. The pressure booster valve is connected in series on the return pipeline. The online analyzer is connected to the third port of the three-way solenoid valve through the pretreatment pipeline. The three-way solenoid valve is used to switch the connection between the sampling pipeline and the pretreatment pipeline or the return pipeline.

2. The natural gas on-line analysis device according to claim 1, characterized in that, A sampling probe is installed between the sampling pipeline and the sampling valve. The sampling probe is mounted on the sampling valve, and the probe of the sampling probe extends into the natural gas pipeline through the sampling valve. The end of the sampling probe away from the sampling valve is connected to the sampling pipeline.

3. The natural gas on-line analysis device according to claim 2, characterized in that, It also includes a particulate filter, a pressure reducing valve, and a membrane filter, wherein the particulate filter, the pressure reducing valve, and the membrane filter are connected in series on the pretreatment pipeline, and the particulate filter, the pressure reducing valve, and the membrane filter are sequentially connected from the three-way solenoid valve toward the online analyzer.

4. The natural gas on-line analysis device according to claim 3, characterized in that, It also includes a first ball valve and a second ball valve, wherein the first ball valve and the second ball valve are both connected in series on the pretreatment pipeline, the first ball valve is connected to the three-way solenoid valve, and the particulate filter and the pressure reducing valve are arranged between the first ball valve and the second ball valve.

5. The on-line natural gas analysis device of claim 4, wherein, It also includes a solenoid valve, which is connected in series on the pretreatment pipeline and is located between the second ball valve and the membrane filter.

6. The natural gas on-line analysis device according to claim 5, characterized in that It also includes a first three-way ball valve, a second three-way ball valve, and a backup pipeline, among which, The first three-way ball valve and the second three-way ball valve are respectively connected in series on the pretreatment pipeline. The first three-way ball valve is connected to the second ball valve, and the second three-way ball valve is connected to the membrane filter. The first three-way ball valve, the solenoid valve and the second three-way ball valve are connected in sequence. One end of the backup pipeline is connected to the first three-way ball valve, and the other end of the backup pipeline is connected to the second three-way ball valve.

7. The on-line natural gas analysis device of claim 5, wherein, It also includes a controller, which is connected to the online analyzer, the solenoid valve and the three-way solenoid valve respectively.

8. The on-line natural gas analysis device of claim 1, wherein, It also includes a sampling pipeline, one end of which is connected to the exhaust port of the online analyzer, and the other end of which is connected to the external sampling main pipe.

9. The on-line natural gas analysis device of claim 8, wherein, It also includes an injector, which is connected in series on the surveying pipeline.

10. The on-line natural gas analysis device of claim 1, wherein, It also includes an electric heat tracing and insulation tape, which is installed on the sampling pipeline.

Images