High-precision on-line sampling device for natural gas conveying pipeline

Abstract

According to the high-precision online sampling device for the natural gas conveying pipeline, an electric telescopic rod on a base is connected with a lifting table, a sampling bottle supporting rod and a residual gas cleaning device are arranged on the lifting table, a first piston is arranged in a sampling bottle fixedly connected with the sampling bottle supporting rod, and a waste gas outlet pipe, a sample gas outlet pipe and a second sampling pipe are arranged at the bottom end of the sampling bottle; an electric control valve and a high-precision turbine flowmeter are arranged on the second sampling pipe, the second sampling pipe is connected with one end of a sampling pump, the other end of the sampling pump is connected with a first sampling pipe, the first sampling pipe is connected with a filter barrel through a sealing flange, and the other end of the filter barrel is connected with a sampling joint through the same sealing flange; a nitrogen outlet pipe is arranged at the top end of the sampling bottle, the sampling bottle is connected with a residual gas cleaning device through a nitrogen inlet pipe, the sampling device can completely exhaust residual gas in the sampling bottle, natural gas can be filtered, the precision of the natural gas is improved, and the accuracy of subsequent detection is improved.

Description

Technical Field

[0001] This utility model relates to the field of natural gas sampling technology, specifically to a high-precision online sampling device for natural gas transmission pipelines. Background Technology

[0002] Natural gas is a mixture of hydrocarbons found deep underground and is considered a high-quality fuel and chemical feedstock. Natural gas requires pipelines for transportation, and these pipelines need to be sampled and tested regularly. However, the following problems may arise when sampling natural gas from these pipelines:

[0003] 1. During sampling, the original gas in the sampling bottle may not be completely eliminated, resulting in residual gas. The residual gas will mix with the sample, thereby reducing the purity of the sample and affecting the accuracy of subsequent tests.

[0004] 2. During sampling, natural gas may contain various impurities such as moisture, grease, and dust, which will reduce the purity and quality of the natural gas and thus affect the accuracy of subsequent testing. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-precision online sampling device for natural gas pipelines. This device can completely exhaust residual gas in the sampling bottle and filter the natural gas, thereby improving the accuracy of natural gas sampling and subsequent testing.

[0006] The present invention employs a high-precision online sampling device for natural gas pipelines, comprising a base, an electric telescopic rod on the base, a lifting platform connected to the top of the electric telescopic rod, a sampling bottle support rod and a residual gas cleaning device on the lifting platform, a sampling bottle support rod fixedly connected to the sampling bottle, a first piston inside the sampling bottle, an exhaust gas outlet pipe, a sample gas outlet pipe and a second sampling pipe at the bottom of the sampling bottle, an exhaust gas outlet valve on the exhaust gas outlet pipe, a sample gas outlet valve on the sample gas outlet pipe, an electric control valve and a high-precision turbine flow meter on the second sampling pipe, one end of the second sampling pipe connected to a sampling pump, the other end of the sampling pump connected to the first sampling pipe, the first sampling pipe connected to a filter barrel through a sealing flange, the other end of the filter barrel connected to a sampling connector through the same sealing flange, a filter structure inside the filter barrel, a nitrogen outlet pipe at the top of the sampling bottle with a nitrogen outlet valve, the sampling bottle connected to the residual gas cleaning device through a nitrogen inlet pipe, and a nitrogen inlet valve on the portion of the nitrogen inlet pipe near the sampling bottle.

[0007] The residual gas cleaning device includes a nitrogen storage bottle, which is fixed above the lifting platform by a nitrogen storage bottle bracket. Both the top and bottom ends of the nitrogen storage bottle are equipped with sealing caps. A second piston is installed inside the nitrogen storage bottle, and a piston push rod is connected to the top of the second piston. The other end of the piston push rod passes through the sealing cap at the top. A nitrogen inlet pipe and a nitrogen replenishment pipe are respectively inserted into the bottom end of the nitrogen storage bottle. A nitrogen replenishment valve is installed on the part of the nitrogen replenishment pipe that passes through the sealing cap at the bottom end. The other end of the nitrogen inlet pipe passes through the sealing cap at the bottom end and is connected to a sampling bottle.

[0008] The filter structure includes a pre-filter metal screen and a post-filter ceramic membrane located on both sides of the filter barrel. Both the pre-filter metal screen and the post-filter ceramic membrane are fixed to the same outer ring plate. A sealing ring is provided on the outer ring of the outer ring plate. A handle is connected to the upper and lower ends of one side of the outer ring plate. A slot is provided in the upper and lower ends of the other side of the outer ring plate. A locking block is engaged in the slot. The locking block is fixed to a small hanging plate. The small hanging plate is fixed to the upper and lower inner sidewalls of the filter barrel. Identical limiting L-shaped round rods are fixed on the inner sidewalls of the left and right sides of the filter barrel. The limiting L-shaped round rods pass through limiting sliding holes. The limiting sliding holes are located on the left and right sides of the outer ring plate. A sealing ring is provided at the limiting sliding holes.

[0009] The sampling pump is fixed on the support plate, one end of the support plate is fixedly connected to the sampling bottle support rod, and the support plate is provided with a tube through hole, through which a second sampling tube passes.

[0010] The sampling bottle is equipped with a pressure gauge near the top.

[0011] The electric control valve uses an explosion-proof stepper motor.

[0012] The base is equipped with a control cabinet, and the control cabinet is equipped with a control processor. The control processor is electrically connected to the electric control valve and the high-precision turbine flow meter.

[0013] The beneficial effects of this utility model are as follows: This utility model is equipped with a residual gas cleaning device. The nitrogen storage bottle in the residual gas cleaning device stores nitrogen gas. Under the action of the second piston and the piston push rod, the nitrogen gas in the nitrogen storage bottle can enter the sampling bottle from the nitrogen gas inlet pipe. It can also cause the first piston in the sampling bottle to move downward, so that the residual gas in the sampling bottle can be discharged from the exhaust gas outlet pipe. This solves the problem that when the residual gas is not completely discharged, it will mix with the sample, thereby reducing the purity of the sample and affecting the accuracy of subsequent detection.

[0014] In this invention, a filter bucket is provided, which contains a filter structure. The pre-filter metal screen and post-filter ceramic membrane in the filter structure can perform multi-stage filtration of natural gas, effectively eliminating various impurities such as moisture, grease, and dust that may be present in natural gas. This solves the problem that if natural gas contains impurities, it will reduce the purity and quality of natural gas, thereby affecting the accuracy of subsequent testing.

[0015] In this invention, both the pre-filter metal screen and the post-filter ceramic membrane are fixed to the outer ring plate. A handle is provided on one side of the outer ring plate, and a slot is provided on the other side. A locking block is engaged in the slot, and the locking block is fixed inside the filter barrel by a small hanging plate. The pre-filter metal screen and the post-filter ceramic membrane can be quickly installed and removed simply by pushing and pulling the handle. At the same time, the limiting L-shaped round rod inside the filter barrel can slide in the limiting sliding hole, which facilitates the alignment of the slot and the locking block.

[0016] In this invention, an electric control valve and a high-precision turbine flow meter are installed on the second sampling tube, which can accurately control the flow rate and flow rate during natural gas collection, and realize precise control of the quantity of natural gas sampled.

[0017] This invention incorporates an electric telescopic rod and a lifting platform, which facilitates control of the sampling connector height and improves the convenience of sampling operations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a cross-sectional schematic diagram of the filter structure of this utility model.

[0020] Figure 3 This is a front view schematic diagram of the filter structure of this utility model.

[0021] Figure 4 This is a top view schematic diagram of the through-hole and support plate of this utility model.

[0022] Figure 5 This is a front view schematic diagram of the card slot and outer ring plate of this utility model.

[0023] In the diagram: 1. Base, 2. Electric telescopic rod, 3. Lifting platform, 4. Sampling bottle support rod, 5. Electric control valve, 6. Support plate, 7. Sampling connector, 8. Sealing flange, 9. Filter barrel, 10. First sampling tube, 11. Sampling pump, 12. High-precision turbine flow meter, 13. Second sampling tube, 14. Nitrogen outlet valve, 15. Nitrogen outlet pipe, 16. Sample outlet pipe, 17. Sample outlet valve, 18. Pressure gauge, 19. Nitrogen inlet valve, 20. First piston, 21. Waste 22. Exhaust gas outlet pipe, 23. Nitrogen inlet pipe, 24. Nitrogen storage bottle support, 25. Nitrogen replenishment pipe, 26. Sampling bottle, 27. Nitrogen storage bottle, 28. Second piston, 29. Sealing cap, 30. Piston push rod, 31. Pre-filter metal screen, 32. Outer ring plate, 33. Handle, 34. Slot, 35. Sealing ring, 36. Locking block, 37. Small hanging plate, 38. Limiting L-shaped round rod, 39. Post-filter ceramic membrane, 40. Limiting sliding hole, 41. Through-pipe perforation. Detailed Implementation

[0024] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] Referring to the accompanying drawings, a high-precision online sampling device for natural gas pipelines includes a base 1, on which an electric telescopic rod 2 is mounted. The top of the electric telescopic rod 2 is connected to a lifting platform 3. The lifting platform 3 is equipped with a sampling bottle support rod 4 and a residual gas cleaning device. The sampling bottle support rod 4 is fixedly connected to a sampling bottle 26. A first piston 20 is located inside the sampling bottle 26. The bottom of the sampling bottle 26 is equipped with an exhaust gas outlet pipe 21, a sample outlet pipe 16, and a second sampling pipe 13. An exhaust gas outlet valve 22 is mounted on the exhaust gas outlet pipe 21, a sample outlet valve 17 is mounted on the sample outlet pipe 16, and an electric control device is mounted on the second sampling pipe 13. Valve 5 and high-precision turbine flow meter 12, the second sampling tube 13 is connected to one end of sampling pump 11, the other end of sampling pump 11 is connected to first sampling tube 10, the first sampling tube 10 is connected to filter barrel 9 through sealing flange 8, the other end of filter barrel 9 is connected to sampling connector 7 through the same sealing flange 8, the filter barrel 9 is provided with a filter structure, the top of sampling bottle 26 is provided with nitrogen outlet pipe 15, nitrogen outlet pipe 15 is provided with nitrogen outlet valve 14, sampling bottle 26 is connected to residual gas cleaning device through nitrogen inlet pipe 23, nitrogen inlet pipe 23 is provided with nitrogen inlet valve 19 near sampling bottle 26.

[0026] The residual gas cleaning device includes a nitrogen storage bottle 27, which is fixed above the lifting platform 3 by a nitrogen storage bottle bracket 24. Both the upper and lower ends of the nitrogen storage bottle 27 are provided with sealing caps 29. A second piston 28 is provided inside the nitrogen storage bottle 27. The top end of the second piston 28 is connected to a piston push rod 30. The other end of the piston push rod 30 passes through the sealing cap 29 at the top. A nitrogen inlet pipe 23 and a nitrogen replenishment pipe 25 are respectively inserted into the bottom end of the nitrogen storage bottle 27. A nitrogen replenishment valve is provided on the part of the nitrogen replenishment pipe 25 that passes through the sealing cap 29 at the bottom end. The other end of the nitrogen inlet pipe 23 passes through the sealing cap 29 at the bottom end and is connected to a sampling bottle 26.

[0027] The filter structure includes a pre-mounted metal filter screen 31 and a post-mounted ceramic filter membrane 39 located on both sides of the filter barrel 9. Both the pre-mounted metal filter screen 31 and the post-mounted ceramic filter membrane 39 are fixed on the same outer ring plate 32. A sealing ring 35 is provided on the outer ring of the outer ring plate 32. A handle 33 is connected to the upper and lower ends of one side of the outer ring plate 32. A slot 34 is provided in the upper and lower ends of the other side of the outer ring plate 32. A locking block 36 is locked in the slot 34. The locking block 36 is fixed on a small hanging plate 37. The small hanging plate 37 is fixed on the upper and lower inner sidewalls of the filter barrel 9. Identical limiting L-shaped round rods 38 are fixed on the inner sidewalls of the left and right sides of the filter barrel 9. The limiting L-shaped round rods 38 pass through limiting sliding holes 40. The limiting sliding holes 40 are located on the left and right sides of the outer ring plate 32. A sealing ring is provided at the limiting sliding holes 40.

[0028] The sampling pump 11 is fixed on the support plate 6. One end of the support plate 6 is fixedly connected to the sampling bottle support rod 4. The support plate 6 is provided with a tube through hole 41, and a second sampling tube 13 passes through the tube through hole 41.

[0029] The sampling bottle 26 is equipped with a pressure gauge 18 near the top.

[0030] The motor used in the electric control valve 5 is an explosion-proof stepper motor.

[0031] The base 1 is equipped with a control cabinet, and the control cabinet is equipped with a control processor. The control processor is electrically connected to the electric control valve 5 and the high-precision turbine flow meter 12.

[0032] When using this high-precision online sampling device for natural gas pipelines, first open the nitrogen inlet valve 19 and the exhaust gas outlet valve 22. Then, push the piston rod 30 downward to move the second piston 28 downward. The downward movement of the second piston 28 allows the nitrogen in the nitrogen storage bottle 27 to enter the sampling bottle 26 through the nitrogen inlet pipe 23. As the nitrogen in the sampling bottle 26 gradually increases, it will squeeze the first piston 20 downward. The downward movement of the first piston 20 allows the residual exhaust gas in the sampling bottle 26 to be discharged from the exhaust gas outlet pipe 21 and finally completely discharged. Then, close the nitrogen inlet valve 19 and the exhaust gas outlet valve 22.

[0033] After the residual exhaust gas in the sampling bottle 26 is completely removed, the electric telescopic rod 2 is activated, which raises the lifting platform 3. When the sampling connector 7 is raised to a suitable height, the electric telescopic rod 2 is closed. Then, the sampling connector 7 is connected to the sampling connector on the natural gas pipeline. After connection, the sampling pump 11 and the electric control valve 5 are activated, and the nitrogen outlet valve 14 is opened. The sampling pump 11 can extract the natural gas in the natural gas pipeline and make the natural gas sample pass through the filter bucket 9, the first sampling tube 10 and the second sampling tube 13 in sequence into the sampling bottle 26. It can also make the first piston 20 move upward, so that the nitrogen in the space above the first piston 20 is discharged from the nitrogen outlet pipe 15.

[0034] When the collected natural gas sample passes through the filter barrel 9, the pre-metal filter screen 31 and the post-ceramic filter membrane 39 in the filter barrel 9 can filter the natural gas and effectively remove impurities contained in the natural gas sample. When it is necessary to replace the pre-metal filter screen 31 and the post-ceramic filter membrane 39, the filter barrel 9 can be removed by unscrewing the fastening screws on the sealing flange 8. Then, hold the handles 33 at both ends and pull them outwards to separate the locking block 36 from the locking groove 34. This will allow the outer ring plate 32 to be pulled outwards along the limiting L-shaped round rod 38. After the outer ring plate 32 is pulled out of the filter barrel 9, a new outer ring plate 32, a new pre-metal filter screen 31, and a new post-ceramic filter membrane 39 can be replaced.

[0035] When the collected natural gas sample passes through the second sampling tube 13, the high-precision turbine flow meter 12 can accurately measure the flow rate of the natural gas sample and transmit the measured signal to the control processor in real time. The control processor can then control and adjust the electric control valve 5 in real time to ensure the accuracy of the quantity of natural gas sampled.

[0036] In this invention, a residual gas cleaning device is provided. The nitrogen storage bottle 27 in the residual gas cleaning device stores nitrogen gas. Under the action of the second piston 28 and the piston push rod 30, the nitrogen gas in the nitrogen storage bottle 27 can enter the sampling bottle 26 from the nitrogen inlet pipe 23. This allows the first piston 20 in the sampling bottle 26 to move downward, so that the residual gas in the sampling bottle 26 can be discharged from the exhaust gas outlet pipe 21. This solves the problem that if the residual gas is not completely discharged, it will mix with the sample, thereby reducing the purity of the sample and affecting the accuracy of subsequent detection.

[0037] In this utility model, a filter barrel 9 is provided, and a filter structure is provided inside the filter barrel 9. The pre-metal filter screen 31 and the post-ceramic filter membrane 39 in the filter structure can perform multi-stage filtration of natural gas, which can effectively eliminate various impurities such as moisture, grease, and dust that may be contained in natural gas. This solves the problem that if natural gas contains impurities, it will reduce the purity and quality of natural gas, thereby affecting the accuracy of subsequent testing.

[0038] In this invention, both the pre-mounted metal filter 31 and the post-mounted ceramic filter membrane 39 are fixed on the outer ring plate 32. A handle 33 is provided on one side of the outer ring plate 32, and a slot 34 is provided on the other side of the outer ring plate 32. A locking block 36 is engaged in the slot 34. The locking block 36 is fixed in the filter barrel 9 by a small hanging plate 37. The pre-mounted metal filter 31 and the post-mounted ceramic filter membrane 39 can be quickly installed and removed simply by pushing and pulling the handle 33. At the same time, the limiting L-shaped round rod 38 in the filter barrel 9 can slide in the limiting sliding hole 40, which facilitates the alignment of the slot 34 and the locking block 36.

[0039] In this invention, an electric control valve 5 and a high-precision turbine flow meter 12 are installed on the second sampling tube 13, which can accurately control the flow rate and flow rate during natural gas collection, and realize precise control of the quantity of natural gas sampled.

[0040] In this invention, an electric telescopic rod 2 and a lifting platform 3 are provided to facilitate control of the height of the sampling connector 7 and improve the convenience of sampling operations.

[0041] The above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all possible implementations. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A high-precision natural gas transmission pipeline online sampling device comprising a base (1), characterized in that: The base (1) is provided with an electric telescopic rod (2), the top end of the electric telescopic rod (2) is connected with a lifting platform (3), the lifting platform (3) is provided with a sampling bottle supporting rod (4) and a residual gas cleaning device, the sampling bottle supporting rod (4) is fixedly connected with a sampling bottle (26), the sampling bottle (26) is provided with a first piston (20) inside, the bottom end of the sampling bottle (26) is provided with a waste gas outlet pipe (21), a sample outlet pipe (16) and a second sampling pipe (13), the waste gas outlet pipe (21) is provided with a waste gas outlet valve (22), the sample outlet pipe (16) is provided with a sample outlet valve (17), the second sampling pipe (13) is provided with an electric control valve (5) and a high-precision turbine flowmeter (12), one end of the second sampling pipe (13) is connected with a sampling pump (11), the other end of the sampling pump (11) is connected with a first sampling pipe (10), the first sampling pipe (10) is connected with a filtering barrel (9) through a sealing flange (8), the other end of the filtering barrel (9) is connected with a sampling joint (7) through the same sealing flange (8), the filtering barrel (9) is provided with a filtering structure inside, the top end of the sampling bottle (26) is provided with a nitrogen outlet pipe (15), the nitrogen outlet pipe (15) is provided with a nitrogen outlet valve (14), the sampling bottle (26) is connected with the residual gas cleaning device through a nitrogen inlet pipe (23), the part of the nitrogen inlet pipe (23) close to the sampling bottle (26) is provided with a nitrogen inlet valve (19).

2. The high-precision online sampling device for natural gas transmission pipeline according to claim 1, characterized in that: The residual gas cleaning device comprises a nitrogen storage bottle (27), the nitrogen storage bottle (27) is fixed above the lifting platform (3) through a nitrogen storage bottle support (24), the upper and lower ends of the nitrogen storage bottle (27) are provided with sealing covers (29), the nitrogen storage bottle (27) is provided with a second piston (28) inside, the top end of the second piston (28) is connected with a piston push rod (30), the other end of the piston push rod (30) penetrates the sealing cover (29) at the top end, the bottom end of the nitrogen storage bottle (27) is respectively inserted with the nitrogen inlet pipe (23) and a nitrogen supplement pipe (25), the part of the nitrogen supplement pipe (25) penetrating the sealing cover (29) at the bottom end is provided with a nitrogen supplement valve, the other end of the nitrogen inlet pipe (23) is connected with the sampling bottle (26) after penetrating the sealing cover (29) at the bottom end.

3. The high-precision online sampling device for natural gas transmission pipeline according to claim 1, characterized in that: The filter structure includes a front metal filter screen (31) and a rear ceramic filter membrane (39) respectively located in the inside of both sides of the filter barrel (9), the front metal filter screen (31) and the rear ceramic filter membrane (39) are fixed on the same outer ring plate (32), the outer ring plate (32) is provided with a sealing ring (35) on the outer ring, one side of the outer ring plate (32) is connected with a handle (33) at the upper and lower ends, the other side of the outer ring plate (32) is provided with a clamping groove (34) at the upper and lower ends, the clamping groove (34) is clamped with a clamping block (36), the clamping block (36) is fixed on a small lifting plate (37), the small lifting plate (37) is fixed on the upper and lower inner side walls of the filter barrel (9), the same limiting L-shaped round rod (38) is fixed on the left and right inner side walls of the filter barrel (9), the limiting L-shaped round rod (38) passes through the limiting sliding hole (40), the limiting sliding hole (40) is located on the left and right sides of the outer ring plate (32), and the limiting sliding hole (40) is provided with a sealing ring.

4. The high-precision online sampling device for natural gas transmission pipeline according to claim 1, characterized in that: The sampling pump (11) is fixed on the supporting plate (6), one end of the supporting plate (6) is fixedly connected with the sampling bottle supporting rod (4), the supporting plate (6) is provided with a pipe penetrating hole (41), and the second sampling pipe (13) penetrates through the pipe penetrating hole (41).

5. The high-precision online sampling device for natural gas transmission pipeline according to claim 1, characterized in that: The sampling bottle (26) is provided with an air pressure gauge (18) near the top end.

6. The high-precision online sampling device for natural gas transmission pipeline according to claim 1, characterized in that: The motor used in the electric control valve (5) is an explosion-proof stepping motor.

7. The high-precision online sampling device for natural gas transmission pipeline according to claim 1, characterized in that: The base (1) is provided with a control cabinet, the control cabinet is installed with a control processor, and the control processor is electrically connected with the electric control valve (5) and the high-precision turbine flowmeter (12).

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