Natural gas online continuous accumulation sampler system

Abstract

The utility model provides a natural gas on-line continuous accumulation sampler system which comprises a sampling valve, a pressure stabilizing valve, a four-way electromagnetic valve, a quantitative sampling piston pipe, a gas storage one-way valve, a piston gas storage bottle, a gas inlet pipeline and a gas exhaust pipeline, the gas inlet pipeline is connected with the sampling valve, the sampling valve is connected with the quantitative sampling piston pipe through a pipeline, and the gas exhaust pipeline is connected with the gas storage one-way valve. The pressure stabilizing valve and the piston gas storage bottle are connected with a pipeline between the sampling valve and the quantitative sampling piston pipe through pipelines, and the quantitative sampling piston pipe is connected with the four-way electromagnetic valve and the gas storage one-way valve through pipelines. The four-way electromagnetic valve is connected with the pressure stabilizing valve and the exhaust pipeline through pipelines, and the gas storage one-way valve is connected with the piston gas storage bottle through a pipeline.

Description

Technical Field

[0001] This utility model relates to the field of natural gas sampling technology, and in particular to a natural gas online continuous accumulation sampler system. Background Technology

[0002] Currently, most natural gas pipeline networks are equipped with online gas chromatographs (GCs) to analyze the calorific value of the natural gas within the pipeline and distribute the data in real time to flow computers for energy measurement. However, due to economic reasons, most online GCs deployed in natural gas pipeline networks are single-point, single-unit configurations, lacking any redundant monitoring equipment. Once energy measurement is implemented, if the GC malfunctions, the gas quality changes at that point cannot be monitored, leading to significant measurement errors, disputes, and impacting the economic interests of both trading parties.

[0003] In the existing technology, natural gas cumulative samplers all use a fixed time period sampling method. The controller starts sampling after receiving a signal, continuously samples according to the sampling period, and stores the sampled gas in a gas cylinder. After the sampling is completed, the sampled gas in the gas cylinder is analyzed offline.

[0004] There is a large amount of residual gas at the natural gas pipeline intake point and sampling pipeline. The existing technology is to extract only a small amount of gas and there is no fast loop to process the residual gas, which cannot effectively ensure the representativeness of the sampling. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a natural gas online continuous cumulative sampler system to address the shortcomings of the existing technology.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A natural gas online continuous accumulation sampler system includes: a sampling valve, a pressure stabilizing valve, a four-way solenoid valve, a quantitative sampling piston tube, a gas storage check valve, a piston gas storage cylinder, an inlet pipeline, and an exhaust pipeline. The inlet pipeline is connected to the sampling valve. The sampling valve is connected to the quantitative sampling piston tube through a pipeline. The pressure stabilizing valve and the piston gas storage cylinder are connected to the pipeline between the sampling valve and the quantitative sampling piston tube through a pipeline. The quantitative sampling piston tube is connected to the four-way solenoid valve and the gas storage check valve through a pipeline. The four-way solenoid valve is connected to the pressure stabilizing valve and the exhaust pipeline through a pipeline. The gas storage check valve is connected to the piston gas storage cylinder through a pipeline.

[0007] The beneficial effects of this utility model's technical solution are as follows: By setting up a rapid loop, continuous gas flow is achieved in the pipeline before sampling, quickly eliminating a large amount of residual gas at the sampling point and in the sampling pipeline, ensuring the representativeness of the sample at each sampling frequency. The sample is stored in a steel cylinder using a matching piston sampling bottle for offline gas chromatography-mass spectrometry and calorific value analysis to reproduce the composition and calorific value of natural gas during sampling. The sampling valve controls the total gas intake of the accumulator sampler; it is open during normal operation and closed when not in operation. The pressure regulating valve adjusts the driving gas pressure to achieve stable automatic sampling. The four-way solenoid valve controls the selection of sampling gas intake, exhaust, and rapid loop purging. The gas storage check valve prevents backflow of gas in the storage cylinder. The quantitative sampling piston tube is used to achieve quantitative sampling. The piston storage cylinder stores natural gas samples for a period of time for offline calorific value analysis. The piston storage cylinder can be vacuumed to prevent gas sampling interference.

[0008] Furthermore, the quantitative sampling piston tube includes: an actuating cylinder, a sampling piston, and a repeating spring. A sampling chamber is provided between the sampling piston and the actuating cylinder. The sampling piston is slidably installed in the actuating cylinder. The two ends of the repeating spring are in contact with the sampling piston and the actuating cylinder respectively.

[0009] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the actuating cylinder drives the sampling piston downward, expelling the gas in the sampling chamber and into the sampling bottle. This action is maintained for a certain period of time to ensure that the gas is completely expelled. The solenoid valve closes, the actuating cylinder depressurizes, and the sampling piston is reset via the return spring. At the same time, the sample gas re-enters the sampling chamber under the action of pressure difference.

[0010] Furthermore, the actuating cylinder is connected to a solenoid valve, a sampling bottle, and a sample pipeline; the solenoid valve is connected to a driving gas pipeline; and the actuating cylinder is provided with an exhaust port.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: When the solenoid valve opens, gas is introduced into the actuating cylinder. The actuating cylinder drives the sampling piston downwards, expelling the gas from the sampling chamber and into the sampling bottle. This action is maintained for a certain period to ensure complete gas expulsion. When the solenoid valve closes, the actuating cylinder depressurizes, and the sampling piston is reset via the return spring. Simultaneously, the sample gas re-enters the sampling chamber under the pressure difference.

[0012] Furthermore, the top of the actuating cylinder is provided with an adjusting head, one end of which passes through the actuating cylinder and abuts against the sampling piston, while the other end of the adjusting head is exposed on the outside.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that the adjustment method is to turn the adjustment head, and the longitudinal scale decreases when the sampling amount decreases, and vice versa.

[0014] Furthermore, a filter and a sampling check valve are provided on the pipeline between the air intake pipeline and the sampling valve; an NPT male threaded ferrule connector is provided on the air intake pipeline.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the inlet is equipped with a 1 / 2” NPT male threaded compression fitting, which connects to the reserved interface of the natural gas pipeline, and natural gas is introduced into the accumulator sampler through a 1 / 8” stainless steel pressure tapping pipe. A filter is used to remove large particulate impurities, liquid hydrocarbons, and water from the natural gas. A sampling check valve is used to prevent backflow of the sampled gas.

[0016] Furthermore, a gas storage shut-off valve is provided on the pipeline between the gas storage check valve and the piston gas storage cylinder, and a pressure gauge is provided on the pipeline between the gas storage shut-off valve and the piston gas storage cylinder.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The gas storage shut-off valve is used to control the gas intake. When the online continuous accumulator sampler system is working normally, this valve is in the open state, allowing the sample to be pushed into the piston gas storage cylinder. When the piston gas storage cylinder is full of natural gas, the valve can be closed to stop the intake and the cylinder can be replaced. The pressure gauge is used to monitor the gas pressure inside the storage cylinder.

[0018] Furthermore, a back pressure valve is provided on the pipeline between the piston gas storage cylinder and the sampling valve and the quantitative sampling piston tube; the piston gas storage cylinder is equipped with a visual vernier and a magnetic induction scale.

[0019] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the back pressure valve is used to prevent backflow of gas in the gas storage cylinder. The piston gas storage cylinder is equipped with a visual vernier for visual inspection of the sampling volume. The piston gas storage cylinder is equipped with a magnetic induction scale; through the scale composed of a magnetic sensor array, the position signal of the piston can be connected to the system, enabling the system to identify the current real-time sampling volume for monitoring the target sampling volume.

[0020] Furthermore, the intake pipeline is connected to the upstream section of the natural gas metering pipeline.

[0021] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The online continuous cumulative sampler system for natural gas is installed in the upstream section of the natural gas metering pipeline. It can perform variable frequency sampling based on the instantaneous or cumulative flow of pipeline natural gas to obtain representative natural gas samples. The samples are stored in steel cylinders through matching piston sampling bottles for offline gas chromatography-mass spectrometry and calorific value analysis to reproduce the composition and calorific value of natural gas during the sampling period.

[0022] Furthermore, the sampling valve, the four-way solenoid valve, and the quantitative sampling piston tube are all connected to a communication control unit.

[0023] The beneficial effect of adopting the above-mentioned further technical solutions is that it facilitates the automatic control of the online continuous accumulator sampler system for natural gas.

[0024] Furthermore, the communication control unit is equipped with a power supply interface, a four-way solenoid valve control signal interface, a sampling position signal interface, a flow input signal interface, a serial communication interface, and a human-machine interaction interface.

[0025] The beneficial effects of adopting the above-mentioned further technical solution are: the communication control unit has a corresponding human-machine interface, which can conveniently set parameters such as sampling mode and sampling frequency, as well as perform start-stop control.

[0026] The advantages of this invention in its additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] Figure 1 This is one of the structural schematic diagrams of the online continuous cumulative sampler system for natural gas provided in an embodiment of this utility model.

[0028] Figure 2 This is the second schematic diagram of the structure of the online continuous cumulative sampler system for natural gas provided in this embodiment of the present invention.

[0029] Figure 3 The present invention provides a quantitative sampling piston tube for embodiments of the present invention.

[0030] Explanation of reference numerals: 1. Sampling valve; 2. Pressure regulating valve; 3. Four-way solenoid valve; 4. Quantitative sampling piston tube; 5. Gas storage check valve; 6. Piston gas storage cylinder; 7. Inlet pipe; 8. Exhaust pipe; 9. Actuating cylinder; 10. Sampling piston; 11. Reciprocating spring; 12. Sampling chamber; 13. Solenoid valve; 14. Sampling bottle; 15. Sample pipe; 16. Drive gas pipe; 17. Exhaust port; 18. Adjusting head; 19. Filter; 20. Sampling check valve; 21. Gas storage shut-off valve; 22. Pressure gauge; 23. Back pressure valve; 24. Communication control unit; 25. Power supply interface; 26. Four-way solenoid valve control signal interface; 27. Sampling volume position signal interface; 28. Flow input signal interface; 29. ​​Serial communication interface; 30. Human-machine interface. Detailed Implementation

[0031] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0032] like Figures 1 to 3As shown in the figure, an embodiment of the present utility model provides a natural gas online continuous cumulative sampler system, including: a sampling valve 1, a pressure stabilizing valve 2, a four-way solenoid valve 3, a quantitative sampling piston tube 4, a gas storage check valve 5, a piston gas storage cylinder 6, an intake pipeline 7, and an exhaust pipeline 8. The intake pipeline 7 is connected to the sampling valve 1. The sampling valve 1 is connected to the quantitative sampling piston tube 4 through a pipeline. The pressure stabilizing valve 2 and the piston gas storage cylinder 6 are connected to the pipeline between the sampling valve 1 and the quantitative sampling piston tube 4 through pipelines. The quantitative sampling piston tube 4 is connected to the four-way solenoid valve 3 and the gas storage check valve 5 through pipelines respectively. The four-way solenoid valve 3 is connected to the pressure stabilizing valve 2 and the exhaust pipeline 8 through pipelines. The gas storage check valve 5 is connected to the piston gas storage cylinder 6 through a pipeline.

[0033] The beneficial effects of adopting the technical solution of the present utility model are as follows: By setting up a fast loop, continuous gas flow in the pipeline before sampling is achieved, and a large amount of residual gas at the gas sampling point and in the sampling pipeline is quickly eliminated, ensuring the representativeness of the sample during each sampling frequency. The sample is stored in a steel cylinder through a supporting piston sampling bottle for off-line gas quality and calorific value analysis to reproduce the composition and calorific value of natural gas during the sampling period. The sampling valve is used to control the total intake of the cumulative sampler, which is in an open state during the normal working state of the cumulative sampler and in a closed state during the stop working state. The pressure stabilizing valve is used to adjust the driving gas pressure to achieve stable and automatic sampling. The four-way solenoid valve is used to control the selection of sampling intake, exhaust, and fast loop purging. The gas storage check valve is used to prevent the gas in the gas storage cylinder from flowing back. The quantitative sampling piston tube is used to achieve quantitative sampling. The piston gas storage cylinder is used to store the natural gas sampling sample for a period of time for off-line calorific value analysis. The piston gas storage cylinder can be evacuated to prevent gas sampling interference.

[0034] Figure 1 The arrows in the figure represent the gas flow direction and flow trajectory. The quantitative sampling piston tube can be installed in a box to facilitate the transportation and storage of the natural gas online continuous cumulative sampler system and improve the integration degree of the natural gas online continuous cumulative sampler system.

[0035] The natural gas online continuous cumulative sampler system is a redundant analysis device supporting an online gas chromatograph analyzer. During the failure of the gas chromatograph analyzer, the cumulative sampler can perform online continuous sampling according to requirements, and through off-line sample analysis, obtain the average calorific value of natural gas during the sampling period, and has true representativeness and can be used for trade settlement.

[0036] This utility model provides an online continuous cumulative sampler system for natural gas. Based on the dynamic variation characteristics of the instantaneous or cumulative flow of natural gas, the system adjusts the sampling frequency to follow the dynamic changes in the flow curve. Compensation is used to achieve quantitative sampling at each frequency, ensuring sample representativeness. Simultaneously, the system incorporates a fast loop to ensure continuous gas flow within the pipeline before sampling, guaranteeing sample representativeness at each sampling frequency.

[0037] The cumulative sampler system (online continuous cumulative sampler system for natural gas) mainly consists of three parts: a sampling execution device, a gas storage device, and a communication control unit. The online continuous cumulative sampler system for natural gas is installed upstream of the natural gas metering pipeline. It can perform variable frequency sampling based on the instantaneous or cumulative flow of pipeline natural gas to obtain representative natural gas samples. The samples are stored in steel cylinders through matching piston sampling bottles for offline gas chromatography-mass spectrometry and calorific value analysis to reproduce the composition and calorific value of natural gas during the sampling period.

[0038] like Figures 1 to 3 As shown, the quantitative sampling piston tube 4 further includes: an actuating cylinder 9, a sampling piston 10, and a repeating spring 11. A sampling chamber 12 is provided between the sampling piston 10 and the actuating cylinder 9. The sampling piston 10 is slidably installed in the actuating cylinder 9. The two ends of the repeating spring 11 are in contact with the sampling piston 10 and the actuating cylinder 9 respectively.

[0039] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the actuating cylinder drives the sampling piston downward, expelling the gas in the sampling chamber and into the sampling bottle. This action is maintained for a certain period of time to ensure that the gas is completely expelled. The solenoid valve closes, the actuating cylinder depressurizes, and the sampling piston is reset via the return spring. At the same time, the sample gas re-enters the sampling chamber under the action of pressure difference.

[0040] like Figures 1 to 3 As shown, the actuating cylinder 9 is further connected to a solenoid valve 13, a sampling bottle 14, and a sample pipeline 15. The solenoid valve 13 is connected to a driving air pipeline 16, and the actuating cylinder 9 is provided with an exhaust port 17.

[0041] The beneficial effects of adopting the above-mentioned further technical solution are as follows: When the solenoid valve opens, gas is introduced into the actuating cylinder. The actuating cylinder drives the sampling piston downwards, expelling the gas from the sampling chamber and into the sampling bottle. This action is maintained for a certain period to ensure complete gas expulsion. When the solenoid valve closes, the actuating cylinder depressurizes, and the sampling piston is reset via the return spring. Simultaneously, the sample gas re-enters the sampling chamber under the pressure difference.

[0042] like Figures 1 to 3As shown, the top of the actuating cylinder 9 is provided with an adjusting head 18. One end of the adjusting head 18 passes through the actuating cylinder 9 and abuts against the sampling piston 10, while the other end of the adjusting head 18 is exposed on the outside.

[0043] The beneficial effect of adopting the above-mentioned further technical solution is that the adjustment method is to turn the adjustment head, and the longitudinal scale decreases when the sampling amount decreases, and vice versa.

[0044] like Figures 1 to 3 As shown, further, a filter 19 and a sampling check valve 20 are provided on the pipeline between the air intake pipeline 7 and the sampling valve 1; an NPT male threaded ferrule connector is provided on the air intake pipeline 7.

[0045] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the inlet is equipped with a 1 / 2” NPT male threaded compression fitting, which connects to the reserved interface of the natural gas pipeline, and natural gas is introduced into the accumulator sampler through a 1 / 8” stainless steel pressure tapping pipe. A filter is used to remove large particulate impurities, liquid hydrocarbons, and water from the natural gas. A sampling check valve is used to prevent backflow of the sampled gas.

[0046] like Figures 1 to 3 As shown, further, a gas storage shut-off valve 21 is provided on the pipeline between the gas storage check valve 5 and the piston gas storage cylinder 6, and a pressure gauge 22 is provided on the pipeline between the gas storage shut-off valve 21 and the piston gas storage cylinder 6.

[0047] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The gas storage shut-off valve is used to control the gas intake. When the online continuous accumulator sampler system is working normally, this valve is in the open state, allowing the sample to be pushed into the piston gas storage cylinder. When the piston gas storage cylinder is full of natural gas, the valve can be closed to stop the intake and the cylinder can be replaced. The pressure gauge is used to monitor the gas pressure inside the storage cylinder.

[0048] like Figures 1 to 3 As shown, a back pressure valve 23 is further provided on the pipeline between the piston gas storage cylinder 6 and the sampling valve 1 and the quantitative sampling piston tube 4; the piston gas storage cylinder 6 is equipped with a visual vernier and a magnetic induction scale.

[0049] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the back pressure valve is used to prevent backflow of gas in the gas storage cylinder. The piston gas storage cylinder is equipped with a visual vernier for visual inspection of the sampling volume. The piston gas storage cylinder is equipped with a magnetic induction scale; through the scale composed of a magnetic sensor array, the position signal of the piston can be connected to the system, enabling the system to identify the current real-time sampling volume for monitoring the target sampling volume.

[0050] like Figures 1 to 3 As shown, the intake pipe 7 is further connected to the upstream section of the natural gas metering pipeline.

[0051] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The online continuous cumulative sampler system for natural gas is installed in the upstream section of the natural gas metering pipeline. It can perform variable frequency sampling based on the instantaneous or cumulative flow of pipeline natural gas to obtain representative natural gas samples. The samples are stored in steel cylinders through matching piston sampling bottles for offline gas chromatography-mass spectrometry and calorific value analysis to reproduce the composition and calorific value of natural gas during the sampling period.

[0052] like Figures 1 to 3 As shown, the sampling valve 1, the four-way solenoid valve 3, and the quantitative sampling piston tube 4 are all connected to a communication control unit 24.

[0053] The beneficial effect of adopting the above-mentioned further technical solutions is that it facilitates the automatic control of the online continuous accumulator sampler system for natural gas.

[0054] like Figures 1 to 3 As shown, the communication control unit 24 further includes a power supply interface 25, a four-way solenoid valve control signal interface 26, a sampling position signal interface 27, a flow input signal interface 28, a serial communication interface 29, and a human-machine interface 30.

[0055] The beneficial effects of adopting the above-mentioned further technical solution are: the communication control unit has a corresponding human-machine interface, which can conveniently set parameters such as sampling mode and sampling frequency, as well as perform start-stop control.

[0056] It should be noted that the methods for data acquisition, calculation, comparison, and analysis of the communication control unit and the host computer are all existing technologies. Those skilled in the art can easily figure out how to program them according to actual needs, so they will not be elaborated here.

[0057] The online continuous cumulative sampler system for natural gas provided in this embodiment mainly consists of a sampling execution device, a gas storage device, and a communication control unit. Its implementation principle is as follows:

[0058] The sampling actuator extracts pipeline natural gas, processes it accordingly, extracts a certain volume of natural gas, and pushes it into the gas storage device. The sampling pretreatment device consists of a sampling valve V1, a filter F1, a pressure regulating valve V2, a sampling check valve V3, a four-way solenoid valve V4, a quantitative sampling piston tube T1, a gas storage check valve V5, and corresponding connecting parts and pipelines. Its main functions are as follows:

[0059] (1) The inlet is equipped with a 1 / 2” NPT male threaded ferrule fitting, which is connected to the reserved interface (1 / 2” NPT female thread) of the natural gas pipeline. Natural gas is introduced into the accumulator sampler through a 1 / 8” stainless steel pressure tapping pipe.

[0060] (2) The sampling valve V1 is used to control the total gas intake of the accumulator sampler. The accumulator sampler (natural gas online continuous accumulator sampler system) is in the open state under normal working conditions and in the closed state when it stops working.

[0061] (3) Filter F1 is used to filter out large particulate impurities, liquid hydrocarbons and water in natural gas.

[0062] (4) Pressure regulating valve V2 is used to regulate the driving air pressure to achieve stable automatic sampling.

[0063] (5) The sampling check valve V3 is used to prevent the sampling gas from flowing back.

[0064] (6) The four-way solenoid valve V4 is used to control the selection of sampling intake, exhaust and rapid loop purging.

[0065] (7) Gas storage check valve V5 is used to prevent gas from flowing back into the gas storage bottle (piston gas storage bottle).

[0066] The quantitative sampling piston tube T1 is used for quantitative sampling. The sampling process is as follows: The solenoid valve opens, allowing gas to enter the actuating cylinder. The actuating cylinder moves the sampling piston downwards, displacing the gas in the sampling chamber and into the sampling bottle. This action is maintained for a certain period to ensure complete gas expulsion. The solenoid valve closes, the actuating cylinder depressurizes, and the sampling piston returns to its original position via a return spring. Simultaneously, the sample gas re-enters the sampling chamber under pressure differential. Sampling volume adjustment: The adjustment method is to turn the adjusting head. Decreasing the vertical scale decreases the sampling volume, and vice versa. The vertical scale is configured at 0.2 ml / mm, with an adjustment accuracy of 0.01 mm.

[0067] The gas storage unit includes a gas shut-off valve V6, a back pressure valve V7, a piston gas cylinder T2, a pressure gauge P, and a magnetic induction scale. The main function of the gas storage unit is to store natural gas samples for a period of time for offline calorific value analysis. Its main functions are as follows:

[0068] (1) Gas storage shut-off valve V6 is used to control the gas intake. When the accumulator sampler (natural gas online continuous accumulator sampler system) is working normally, this valve is in the open state, which can push the sampled gas into the piston gas storage cylinder. When the natural gas in the piston gas storage cylinder is full, the valve can be closed to stop the gas intake and the gas cylinder can be replaced.

[0069] (2) Back pressure valve V7 is used to prevent gas from flowing back into the gas storage cylinder (piston gas storage cylinder).

[0070] (3) Pressure gauge P is used to monitor the gas pressure inside the gas storage cylinder (piston gas storage cylinder).

[0071] (4) The gas storage cylinder T2 has a piston structure, which can release the vacuum to prevent gas intake interference.

[0072] (5) The piston gas cylinder is equipped with a visual vernier, each scale is 25ml, totaling 1000ml, for visual inspection of the sampling amount.

[0073] (6) The piston gas cylinder is equipped with a magnetic induction scale. The piston position signal can be connected to the system through the scale composed of magnetic sensor array, so that the system can identify the current real-time sampling quantity and monitor the target sampling quantity.

[0074] The communication control unit uses a microprocessor and its main function is to control the accumulator sampler system (natural gas online continuous accumulator sampler system) and transmit relevant system information. Its main functions are as follows:

[0075] (1) The communication control unit has a corresponding human-machine interface, which can easily set parameters such as sampling mode and sampling frequency, as well as perform start and stop control.

[0076] (2) The communication control unit can receive external input flow signals, which are 4-20mA analog signals or pulse signals. It can automatically perform variable frequency sampling according to the flow rate to track the flow curve.

[0077] (3) The communication control unit can monitor the working status of the accumulator sampler system. In case of abnormal situations, such as gas blockage or gas storage overpressure, it can promptly diagnose and handle the situation, shut down the gas path, stop working, and issue corresponding alarm signals.

[0078] (4) The communication control unit communicates with the host computer using the RS485 serial communication protocol, which can upload relevant data and realize remote real-time monitoring.

[0079] (5) The communication control unit is equipped with a FLASH storage module, which can record and store sampling parameter information.

[0080] (1) This utility model adopts an intelligent control module, which realizes the dynamic change of sampling frequency following the flow curve by fitting the functional relationship between sampling frequency and instantaneous flow or cumulative flow, ensuring the representativeness of the sample, and enabling the sampled gas to best reflect the average calorific value during the sampling period.

[0081] (2) This utility model uses temperature and pressure compensation for the sample gas to achieve quantitative sampling each time.

[0082] (3) This utility model adopts a fast loop system to quickly eliminate a large amount of residual gas in the gas sampling point and sampling pipeline, ensuring that the sample taken at each frequency is representative in real time.

[0083] Finally, it should be noted that 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 natural gas online continuous accumulation sampler system, characterized in that, include: The system includes a sampling valve, a pressure regulating valve, a four-way solenoid valve, a quantitative sampling piston tube, a gas storage check valve, a piston gas storage cylinder, an inlet pipe, and an exhaust pipe. The inlet pipe is connected to the sampling valve. The sampling valve is connected to the quantitative sampling piston tube via a pipe. The pressure regulating valve and the piston gas storage cylinder are connected to the pipe between the sampling valve and the quantitative sampling piston tube via pipes. The quantitative sampling piston tube is connected to the four-way solenoid valve and the gas storage check valve via pipes. The four-way solenoid valve is connected to the pressure regulating valve and the exhaust pipe via pipes. The gas storage check valve is connected to the piston gas storage cylinder via a pipe.

2. The online continuous accumulator sampler system for natural gas according to claim 1, characterized in that, The quantitative sampling piston tube includes: an actuating cylinder, a sampling piston, and a repeating spring. A sampling chamber is provided between the sampling piston and the actuating cylinder. The sampling piston is slidably installed in the actuating cylinder. The two ends of the repeating spring are in contact with the sampling piston and the actuating cylinder respectively.

3. The online continuous accumulator sampler system for natural gas according to claim 2, characterized in that, The actuating cylinder is connected to a solenoid valve, a sampling bottle, and a sample pipeline. The solenoid valve is connected to a driving gas pipeline, and the actuating cylinder is provided with an exhaust port.

4. The online continuous accumulator sampler system for natural gas according to claim 2, characterized in that, The top of the actuating cylinder is provided with an adjusting head, one end of which passes through the actuating cylinder and abuts against the sampling piston, while the other end of the adjusting head is exposed on the outside.

5. The online continuous accumulator sampler system for natural gas according to claim 1, characterized in that, A filter and a sampling check valve are installed on the pipeline between the air intake pipeline and the sampling valve; an NPT male threaded ferrule is installed on the air intake pipeline.

6. The online continuous accumulator sampler system for natural gas according to claim 1, characterized in that, A gas storage shut-off valve is installed on the pipeline between the gas storage check valve and the piston gas storage cylinder, and a pressure gauge is installed on the pipeline between the gas storage shut-off valve and the piston gas storage cylinder.

7. The online continuous cumulative sampler system for natural gas according to claim 1, characterized in that, A back pressure valve is provided on the pipeline between the piston gas cylinder and the sampling valve and the quantitative sampling piston tube; the piston gas cylinder is equipped with a visual vernier and a magnetic induction scale.

8. The online continuous accumulator sampler system for natural gas according to claim 1, characterized in that, The intake pipeline is connected to the upstream section of the natural gas metering pipeline.

9. A natural gas online continuous accumulator sampler system according to claim 1, characterized in that, The sampling valve, the four-way solenoid valve, and the quantitative sampling piston tube are all connected to a communication control unit.

10. A natural gas online continuous accumulator sampler system according to claim 9, characterized in that, The communication control unit is equipped with a power supply interface, a four-way solenoid valve control signal interface, a sampling position signal interface, a flow input signal interface, a serial communication interface, and a human-machine interaction interface.

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