Multifunctional pipeline system for natural gas transportation

Abstract

The utility model discloses a multifunctional pipeline system for natural gas transportation. The multifunctional pipeline system comprises an LNG (liquefied natural gas) storage device, an LNG gasification device, a filter, a compressor, a cooler and an NG pressure-regulating metering odorizing pry, the LNG storage device is connected with the LNG gasification device, the LNG gasification device is connected with the filter through a first gas conveying pipeline, the filter is connected with the compressor through a second gas conveying pipeline, the compressor is connected with the cooler through a third gas conveying pipeline, and the cooler is connected with the NG pressure regulating metering odorizing pry through a fourth gas conveying pipeline. A first root valve and a first pressure transmitter are sequentially arranged on the second gas conveying pipeline, the second gas conveying pipeline is further connected with a first blow-down pipe, a first blow-down valve is arranged on the first blow-down pipe, a second root valve and a second pressure transmitter are sequentially arranged on the third gas conveying pipeline, the third gas conveying pipeline is further connected with a second blow-down pipe, and a second blow-down valve is arranged on the second blow-down pipe. And a second emptying valve is arranged on the second emptying pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas pipeline systems, in particular to a multifunctional pipeline system for natural gas transportation. Background Art

[0002] In natural gas pipeline systems, pressure transmitters are key monitoring devices. Their accuracy and stability are crucial to ensuring safe and efficient natural gas transportation. However, in actual operation, low pressure transmitter readings are often encountered. This not only affects the accurate monitoring of pipeline pressure but also poses a potential threat to the overall safety and stability of the natural gas transmission system.

[0003] One of the main reasons for low pressure transmitter readings is impurities in the gas, especially tiny particles and moisture. These impurities may gradually deposit on the measuring element of the pressure transmitter during natural gas transmission, causing blockage and inaccurate measurements. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a multifunctional pipeline system for natural gas transportation.

[0005] The technical solution adopted in this utility model is:

[0006] A multifunctional pipeline system for natural gas transportation, including: LNG storage device, LNG gasification device, filter, compressor, cooler and NG pressure regulating, metering and odorizing skid;

[0007] The LNG storage device is connected to the LNG gasification device, the LNG gasification device is connected to the filter via a first gas pipeline, the filter is connected to the compressor via a second gas pipeline, the compressor is connected to the cooler via a third gas pipeline, and the cooler is connected to the NG pressure regulating, metering and odorizing skid via a fourth gas pipeline;

[0008] The second gas pipeline is sequentially provided with a first root valve and a first pressure transmitter, and the second gas pipeline is also connected to a first vent pipe, the first vent pipe is provided with a first vent valve, and the first vent pipe is arranged between the first pressure transmitter and the compressor. The third gas pipeline is sequentially provided with a second root valve and a second pressure transmitter, and the third gas pipeline is also connected to a second vent pipe, the second vent pipe is provided with a second vent valve, and the second vent pipe is arranged between the second pressure transmitter and the cooler.

[0009] Preferably, the second gas transmission pipeline is further connected to a first pressure guiding pipe, the first pressure guiding pipe is located between the first root valve and the first pressure transmitter, the first pressure guiding pipe is connected to the first pressure gauge, and a first isolation valve is provided on the first pressure guiding pipe.

[0010] Preferably, the third gas transmission pipeline is further connected to a second pressure guiding pipe, the second pressure guiding pipe is connected to a second pressure gauge, and a second isolation valve is provided on the second pressure guiding pipe.

[0011] Preferably, the LNG gasification device includes an LNG air-temperature vaporizer and an LNG water-bath vaporizer, the LNG storage device is connected to the LNG air-temperature vaporizer through a liquid infusion pipeline, the LNG air-temperature vaporizer is connected to the LNG water-bath vaporizer through a fifth gas infusion pipeline, and the LNG water-bath vaporizer is connected to the filter through a first gas infusion pipeline.

[0012] Preferably, a flow meter, a thermometer and a pressure gauge are sequentially provided on the infusion pipeline.

[0013] Preferably, the NG pressure regulating, metering and odorizing skid is connected to the external transmission pipeline network through a sixth gas transmission pipeline, and a combustible gas detector, a vibration detector and a first shut-off valve are sequentially provided on the sixth gas transmission pipeline.

[0014] Preferably, the LNG storage device is further connected to a BOG gas processing device, which includes a BOG air-temperature vaporizer, a BOG water-bath electric heating reheater, a BOG compressor, a buffer tank and a BOG pressure-regulating, metering and odorizing skid. The BOG air-temperature vaporizer is connected to the LNG storage device, and the BOG air-temperature vaporizer, the BOG water-bath electric heating reheater, the BOG compressor, the buffer tank and the BOG pressure-regulating, metering and odorizing skid are connected in sequence.

[0015] Preferably, a second shut-off valve is also sequentially provided at the inlet of the BOG air-temperature gasifier.

[0016] The beneficial effects of the present invention are at least one of the following:

[0017] By setting up the first vent pipe and the first vent valve, when the pressure transmitter is blocked, the pressure transmitter can be quickly vented and the blocked impurities can be removed, thus restoring normal operation of the pressure transmitter. This helps to improve the accuracy of pressure monitoring and ensure that the system can obtain accurate pressure data in real time during operation.

[0018] By providing the first root valve and the second root valve, the pressure transmitter can be quickly disconnected from the main pipeline when maintenance or inspection is required, thereby facilitating cleaning or replacement operations by maintenance personnel and reducing maintenance time and complexity.

[0019] By installing vent pipes and vent valves on the second and third gas pipelines, respectively, the natural gas in the corresponding pipeline sections can be quickly vented in an emergency, preventing safety accidents caused by excessive pressure or equipment failure. In addition, by regularly removing impurities, the risk of pressure transmitter failure caused by impurity blockage is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a pipeline schematic diagram of the pipeline system of the first embodiment;

[0021] Figure 2 This is a pipeline schematic diagram of the pipeline system of the second embodiment.

[0022] Reference numerals: 1, LNG storage device; 2, LNG vaporization device; 3, filter; 4, compressor; 5, cooler; 6, NG pressure regulating, metering and odorizing skid; 7, first gas transmission pipeline; 8, second gas transmission pipeline; 9, third gas transmission pipeline; 10, fourth gas transmission pipeline; 11, fifth gas transmission pipeline; 12, first root valve; 13, first pressure transmitter; 14, first vent pipe; 15, first vent valve; 16, second root valve; 17, second pressure transmitter; 18, second vent pipe; 19, second vent valve; 20, first pressure guide pipe; 21, first pressure gauge; 22. First isolation valve; 23. Second pressure guide pipe; 24. Second pressure gauge; 25. Second isolation valve; 26. LNG air-temperature vaporizer; 27. LNG water-bath vaporizer; 28. Liquid transmission pipeline; 29. Flow meter; 30. Thermometer; 31. Pressure gauge; 32. Sixth gas transmission pipeline; 33. Combustible gas detector; 34. Vibration detector; 35. First shut-off valve; 36. BOG air-temperature vaporizer; 37. BOG water-bath electric reheater; 38. BOG compressor; 39. Buffer tank; 40. BOG pressure regulating, metering and odorizing skid; 41. Second shut-off valve. DETAILED DESCRIPTION

[0023] In order to make the purpose, scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the present invention and its description are only used to explain the present invention and are not intended to limit the present invention.

[0024] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0025] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout this specification do not necessarily refer to the same embodiment or example. In addition, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, a multifunctional pipeline system for natural gas transportation includes: an LNG storage device 1, an LNG gasification device 2, a filter 3, a compressor 4, a cooler 5 and an NG pressure regulating, metering and odorizing skid 6; the LNG storage device 1 is connected to the LNG gasification device 2, the LNG gasification device 2 is connected to the filter 3 through a first gas transmission pipeline 7, the filter 3 is connected to the compressor 4 through a second gas transmission pipeline 8, the compressor 4 is connected to the cooler 5 through a third gas transmission pipeline 9, and the cooler 5 is connected to the NG pressure regulating, metering and odorizing skid 6 through a fourth gas transmission pipeline 10.

[0029] like Figure 1 As shown, the second gas pipeline 8 is sequentially provided with a first root valve 12 and a first pressure transmitter 13, and the second gas pipeline 8 is also connected to a first vent pipe 14, and the first vent pipe 14 is provided with a first vent valve 15, and the first vent pipe 14 is arranged between the first pressure transmitter 13 and the compressor 4, and the third gas pipeline 9 is sequentially provided with a second root valve 16 and a second pressure transmitter 17, and the third gas pipeline 9 is also connected to a second vent pipe 18, and the second vent pipe 18 is provided with a second vent valve 19, and the second vent pipe 18 is arranged between the second pressure transmitter 17 and the cooler 5.

[0030] Among them, the LNG storage device 1 can be a large cryogenic storage tank for storing liquid natural gas (LNG). The storage tank has good thermal insulation performance to maintain the low temperature state of LNG. The LNG vaporization device 2 includes an LNG air-temperature vaporizer 26 and an LNG water-bath vaporizer 27. The LNG storage device 1 is connected to the LNG air-temperature vaporizer 26 through a liquid transmission pipeline 28. The LNG air-temperature vaporizer 26 is connected to the LNG water-bath vaporizer 27 through a fifth gas transmission pipeline 11. The LNG water-bath vaporizer 27 is connected to the filter 3 through the first gas transmission pipeline 7. A flow meter 29, a thermometer 30 and a pressure gauge 31 are sequentially provided on the liquid transmission pipeline 28.

[0031] Among them, the air-temperature vaporizer uses ambient temperature to naturally vaporize LNG, while the water-bath vaporizer accelerates the vaporization process through hot water circulation. The filter 3 can be a particle filter, which is used to remove tiny particles in the natural gas to prevent them from entering downstream equipment. The compressor 4 uses a reciprocating or centrifugal compressor suitable for natural gas compression to increase the pressure of the natural gas for long-distance transportation or to meet subsequent process requirements. The cooler 5 is used to reduce the temperature of the natural gas at the compressor outlet to prevent high temperature from damaging subsequent equipment or affecting the quality of the natural gas. The NG pressure regulation, metering and odorization skid 6 is a skid-mounted device with integrated pressure regulation, metering and odorization functions, which is used to adjust the natural gas pressure to a range suitable for transportation or use, perform flow metering, and add odorizers for leak detection.

[0032] The first and second gas transmission pipelines are constructed of corrosion-resistant, high-strength stainless steel or alloy steel to ensure the safety and stability of natural gas transportation. The pipelines are equipped with necessary supports and fixtures, as well as flange connections or welded joints. The first and second root valves are ball valves or gate valves, serving as the primary control valves for the pipeline system, used to isolate pipeline sections or perform equipment maintenance. They are installed before the pressure transmitter to shut down the pipeline when necessary and protect the pressure transmitter from damage.

[0033] The first and second pressure transmitters utilize high-precision, high-stability pressure sensors to monitor real-time pressure changes in the natural gas pipeline. They connect to the control system via cables or wirelessly, transmitting pressure data to a monitoring center or control system for processing.

[0034] The first and second vent pipes (the vent pipes are made of the same or similar material as the gas transmission pipeline to ensure that there will be no leakage due to material problems during the venting process. The vent valve uses a fast-response automatic or manual valve to quickly evacuate the gas in the pipeline when needed. Installed between the pressure transmitter and downstream equipment, it is used to evacuate the natural gas in the pipeline during maintenance, repair or emergency situations to prevent impurities from depositing on the measuring element.

[0035] The pressure data can be compared by the first pressure transmitter and the second pressure transmitter. If the readings differ greatly, the problem can be discovered and located in time, reducing misjudgments or missed judgments caused by single equipment failure.

[0036] When the reading of the first pressure transmitter 13 is significantly lower than the normal value, the operator goes to the site and first checks whether the first pressure transmitter 13 itself is faulty. If the first pressure transmitter 13 is not faulty, the operator closes the first root valve 12 connected to the first pressure transmitter 13 and opens the first vent valve 15 to allow the gas in the pipeline section to be discharged through the first vent pipe 14 to remove impurities that may clog the pressure transmitter. During the venting process, the first root valve 12 can be briefly opened and closed several times to use the airflow impact to flush impurities from the pressure transmitter or pipeline. The first vent valve 15 is closed and the first root valve 12 is reopened to restore the pipeline section to normal. Monitor the reading of the first pressure transmitter 13 to confirm whether it has returned to normal. When the reading of the second pressure transmitter 17 is significantly lower than the normal value, the same treatment is used.

[0037] In this embodiment, liquefied natural gas (LNG) is first stored in an LNG storage unit 1, which maintains a low temperature through excellent thermal insulation. When needed, the LNG enters an LNG air-temperature vaporizer 26 via a liquid pipeline 28 for initial vaporization at ambient temperature. The preliminarily vaporized natural gas then enters an LNG water-bath vaporizer 27, where hot water circulation further accelerates the vaporization process. The vaporized natural gas then passes through a first gas pipeline 7 and enters a filter 3, which removes fine particles from the natural gas, ensuring that the natural gas entering the compressor is clean and free of impurities. The filtered natural gas then passes through a second gas pipeline 8 and enters a compressor 4. The compressor, which can be reciprocating or centrifugal suitable for natural gas compression, increases the natural gas pressure to meet long-distance transportation or subsequent processing requirements. The high-temperature, high-pressure natural gas at the compressor outlet enters a cooler 5, where it is cooled to reduce its temperature and prevent damage to downstream equipment. The cooled natural gas then passes through a fourth gas pipeline 10 and enters an NG pressure-regulating, metering, and odorizing skid 6, which integrates pressure regulation, metering, and odorization functions. This device adjusts the natural gas pressure to a suitable range for transportation or use, measures flow, and adds an odorizer for leak detection.

[0038] like Figure 1As shown, in one possible embodiment, the second gas transmission pipeline 8 is further connected to a first pressure guiding pipe 20. The first pressure guiding pipe 20 is located between the first root valve 12 and the first pressure transmitter 13. The first pressure guiding pipe 20 is connected to a first pressure gauge 21. A first isolation valve 22 is provided on the first pressure guiding pipe 20. The third gas transmission pipeline 9 is further connected to a second pressure guiding pipe 23. The second pressure guiding pipe 23 is connected to a second pressure gauge 24. A second isolation valve 25 is provided on the second pressure guiding pipe 23.

[0039] In this embodiment, the first pressure-conducting pipe 20 and the second pressure-conducting pipe 23 serve as backup monitoring paths, respectively, and are connected to their respective pressure gauges (the first pressure gauge 21 and the second pressure gauge 24). Under normal circumstances, the first pressure gauge 21 and the second pressure gauge 24 are in a non-working state. In the event of a failure of the first pressure transmitter 13, the first isolation valve 22 can be opened manually or automatically to connect the first pressure-conducting pipe 20 to the first root valve 12 and the first pressure gauge 21. At this time, the first pressure gauge 21 switches from a non-working state to a working state, and begins to display the pressure value of the first gas pipeline 7 in real time as an alternative monitoring of the first pressure transmitter 13. Similarly, if the second pressure transmitter fails, the second isolation valve 25 is opened to connect the second pressure-conducting pipe 23 to the corresponding pipeline and the second pressure gauge 24, and a similar switching operation is performed.

[0040] like Figure 1 As shown, in a possible embodiment, the NG pressure regulating, metering and odorizing skid 6 is connected to the external transmission network through the sixth gas transmission pipeline 32, and the sixth gas transmission pipeline 32 is provided with a combustible gas detector 33, a vibration detector 34 and a first shut-off valve 35 in sequence. The combustible gas detector 33 is installed on the sixth gas transmission pipeline 32 and is used to monitor in real time whether there is any leakage of natural gas in the pipeline. Once it is detected that the concentration of combustible gas exceeds the safety threshold, the detector will immediately send out an alarm signal to remind the operator to pay attention and take corresponding measures. The vibration detector 34 is used to monitor the vibration of the pipeline and its accessories. Abnormal vibration may indicate that the pipeline is loose, worn or about to rupture, and needs to be repaired in time. When the combustible gas detector or vibration detector sends an alarm signal, or when the system receives other emergency shutdown instructions, the first shut-off valve will be quickly closed to cut off the supply of natural gas to prevent the accident from expanding.

[0041] Example 2

[0042] like Figure 2As shown, in one possible embodiment, the LNG storage device 1 is further connected to a BOG gas processing device, which includes a BOG air-temperature vaporizer 36, a BOG water-bath electric reheater 37, a BOG compressor 38, a buffer tank 39, and a BOG pressure-regulating, metering, and odorizing skid 40. The BOG air-temperature vaporizer 36 is connected to the LNG storage device 1, and the BOG air-temperature vaporizer 36, the BOG water-bath electric reheater 37, the BOG compressor 38, the buffer tank 39, and the BOG pressure-regulating, metering, and odorizing skid 40 are sequentially connected. A second shut-off valve 41 is also sequentially provided at the inlet of the BOG air-temperature vaporizer 36. The BOG pressure-regulating, metering, and odorizing skid 40 is connected to the station's domestic gas pipeline.

[0043] In the LNG storage unit 1, a certain amount of BOG (Boil-Off Gas) is generated due to the evaporation of LNG and the introduction of external heat. In this embodiment, the BOG first enters the BOG air-temperature vaporizer 36, where it is initially vaporized at ambient temperature. A second shut-off valve 41, located at the inlet, is used to shut off the BOG in an emergency to ensure safety. The BOG gas, initially vaporized by the air-temperature vaporizer, then enters the BOG water-bath electric reheater 37, where it is further vaporized and heated to a temperature suitable for subsequent processing through water-bath heating and electric auxiliary heating. The vaporized and heated BOG gas then enters the BOG compressor 38, where it is compressed to a pressure sufficient for subsequent transportation and use. The compressed BOG gas then enters the buffer tank 39 for temporary storage and pressure stabilization, ensuring smooth subsequent processing. Finally, the BOG gas enters the BOG pressure-regulating, metering, and odorizing skid 40. After pressure regulation, metering, and odorization, it meets the requirements of the station's domestic gas pipeline. The BOG gas processing device collects, processes and reuses BOG gas that might otherwise be wasted, thereby improving energy utilization during LNG storage.

[0044] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A multifunctional pipeline system for natural gas transportation, characterized in that: include: LNG storage device (1), LNG gasification device (2), filter (3), compressor (4), cooler (5) and NG pressure regulating, metering and odorizing skid (6); The LNG storage device (1) is connected to the LNG gasification device (2), the LNG gasification device (2) is connected to the filter (3) via a first gas pipeline (7), the filter (3) is connected to the compressor (4) via a second gas pipeline (8), the compressor (4) is connected to the cooler (5) via a third gas pipeline (9), and the cooler (5) is connected to the NG pressure regulating, metering and odorizing skid (6) via a fourth gas pipeline (10); The second gas pipeline (8) is provided with a first root valve (12) and a first pressure transmitter (13) in sequence. The second gas pipeline (8) is also connected to a first vent pipe (14). The first vent pipe (14) is provided with a first vent valve (15). The first vent pipe (14) is provided between the first pressure transmitter (13) and the compressor (4). The third gas pipeline (9) is provided with a second root valve (16) and a second pressure transmitter (17) in sequence. The third gas pipeline (9) is also connected to a second vent pipe (18). The second vent pipe (18) is provided with a second vent valve (19). The second vent pipe (18) is provided between the second pressure transmitter (17) and the cooler (5).

2. A multifunctional pipeline system for natural gas transportation according to claim 1, characterized in that: The second gas transmission pipeline (8) is further connected to a first pressure-guiding pipe (20), the first pressure-guiding pipe (20) being located between the first root valve (12) and the first pressure transmitter (13), the first pressure-guiding pipe (20) being connected to a first pressure gauge (21), and a first isolation valve (22) being provided on the first pressure-guiding pipe (20).

3. The multifunctional pipeline system for natural gas transportation according to claim 1, characterized in that: The third gas transmission pipeline (9) is further connected to a second pressure-guiding pipe (23), the second pressure-guiding pipe (23) being located between the second root valve (16) and the second pressure transmitter (17), the second pressure-guiding pipe (23) being connected to a second pressure gauge (24), and a second isolation valve (25) being provided on the second pressure-guiding pipe (23).

4. A multifunctional pipeline system for natural gas transportation according to claim 1, characterized in that: The LNG gasification device (2) comprises an LNG air-temperature vaporizer (26) and an LNG water-bath vaporizer (27); the LNG storage device (1) is connected to the LNG air-temperature vaporizer (26) via a liquid transmission pipeline (28); the LNG air-temperature vaporizer (26) is connected to the LNG water-bath vaporizer (27) via a fifth gas transmission pipeline (11); and the LNG water-bath vaporizer (27) is connected to the filter (3) via a first gas transmission pipeline (7).

5. A multifunctional pipeline system for natural gas transportation according to claim 4, characterized in that: The liquid infusion pipeline (28) is provided with a flow meter (29), a thermometer (30) and a pressure gauge (31) in sequence.

6. The multifunctional pipeline system for natural gas transportation according to claim 1, characterized in that: The NG pressure regulating, metering and odorizing skid (6) is connected to the external transmission network via a sixth gas transmission pipeline (32), and a combustible gas detector (33), a vibration detector (34) and a first shut-off valve (35) are sequentially provided on the sixth gas transmission pipeline (32).

7. The multifunctional pipeline system for natural gas transportation according to claim 1, characterized in that: The LNG storage device (1) is further connected to a BOG gas processing device, which comprises a BOG air-temperature vaporizer (36), a BOG water-bath electric heating reheater (37), a BOG compressor (38), a buffer tank (39), and a BOG pressure-regulating, metering, and odorizing skid (40). The BOG air-temperature vaporizer (36) is connected to the LNG storage device (1), and the BOG air-temperature vaporizer (36), the BOG water-bath electric heating reheater (37), the BOG compressor (38), the buffer tank (39), and the BOG pressure-regulating, metering, and odorizing skid (40) are connected in sequence.

8. The multifunctional pipeline system for natural gas transportation according to claim 7, characterized in that: A second shut-off valve (41) is also provided at the inlet of the BOG air-temperature gasifier (36).

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