An LNG sampling device based on LNG self-pressurization unloading technology
By designing an LNG sampling device based on LNG self-pressurization unloading technology, the problem of high workload and high risk for operators in the unloading of multiple tank trucks was solved, and convenient and safe LNG sampling was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO HANGZHOU BAY CHINA RESOURCES GAS CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-07-03
Smart Images
Figure CN224454325U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquefied natural gas sampling technology, and more specifically, to an LNG sampling device based on LNG self-pressurization unloading process. Background Technology
[0002] Liquefied natural gas (LNG) is a liquid form of natural gas that has been compressed and cooled to -162°C. LNG has significant advantages such as high unit gas storage capacity, convenient storage and transportation, short construction period, and low investment cost. Generally speaking, 1 m3 of LNG can be vaporized into approximately 625 m3 of natural gas under standard conditions. Therefore, LNG has attracted much attention as an efficient and flexible energy form.
[0003] Due to differences in natural gas sources and liquefaction processes, the composition of LNG varies between different regions and batches. Therefore, sampling and analyzing LNG during storage and transportation to determine its gas composition is crucial. From an economic perspective, if the LNG composition is lower than the data reported by the seller, the calorific value generated by the same volume of gas will be reduced, resulting in economic losses for the buyer. From a safety perspective, if the LNG composition does not meet the prescribed technical standards, the density differences between the different components of LNG after entering the storage tank may exacerbate stratification or even cause LNG rollover, leading to dangerous accidents.
[0004] To date, many researchers have conducted in-depth research on LNG sampling technology and achieved a series of significant results, which have been effectively verified in actual field operations. However, these technological achievements still have shortcomings in terms of the convenience and practicality of LNG sampling. In the actual operation of LNG peak-shaving stations and gasification stations, LNG tank trucks, as the means of transporting LNG, often involve multiple LNG tank trucks unloading simultaneously. If the LNG sampling methods in the relevant technological achievements are adopted, on the one hand, it increases the workload of on-site operators, and on the other hand, with the increase in system equipment, it also increases certain risks.
[0005] Therefore, an LNG sampling device based on LNG self-pressurization unloading process is proposed to address the above problems. Utility Model Content
[0006] In order to overcome the above-mentioned defects of the prior art, the embodiments of this utility model provide an LNG sampling device based on the LNG self-pressurization unloading process to solve the problems mentioned in the background art.
[0007] To achieve the above objectives, this utility model provides the following technical solution: an LNG sampling device based on LNG self-pressurization unloading process, comprising an LNG liquid phase inlet, a gas phase outlet, a stainless steel corrugated metal hose connected to the LNG tanker's pressurized liquid phase interface, an unloading liquid phase pressurization pipeline, a vaporizer, a gas phase pressurization pipeline, and a stainless steel corrugated metal hose connected to the LNG tanker's gas phase interface. The stainless steel corrugated metal hose is characterized by being equipped with a flange connection interface; the unloading liquid phase pressurization pipeline has a cold insulation layer, a shut-off valve, and a venting pipeline installed on its surface; the gas phase pressurization pipeline has a two-valve assembly, a thermometer, a shut-off valve, a venting pipeline, a gas-liquid interconnection pipeline, and an unloading BOG pipeline installed on its surface; the two-valve assembly is equipped with a pressure gauge and is connected to a buffer tank; a sampling port is provided after the buffer tank; and a safety valve is installed inside the shut-off valve.
[0008] Preferably, the stainless steel corrugated metal hose is equipped with a breakaway valve and a dedicated pipe support bracket.
[0009] Preferably, the cold insulation layer is made of heat-insulating material.
[0010] Preferably, the vaporizer is an ambient temperature vaporizer with a vaporization capacity of 400 Nm3 / Hr.
[0011] Preferably, the two-valve assembly has three ports, a first valve, and a second valve. One port is connected to a pipeline, the second port is used to assemble a pressure gauge, and the third port is connected to a buffer tank. Needle valves are installed on both sides of the buffer tank.
[0012] Preferably, the sampling port interface is equipped with a ferrule connector.
[0013] The technical effects and advantages of this utility model are as follows:
[0014] Compared with existing technologies, this utility model is designed based on the LNG self-pressurization unloading process, so fewer devices need to be installed on the process pipeline, and it realizes the function of LNG sampling. At the same time, this utility model has the characteristics of strong practicality and convenient operation. On-site operators can take samples at any time during the unloading of LNG tank trucks without complicated operating procedures, providing a convenient and scientific method for actual production operation. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0016] The attached diagram is labeled as follows: 1. LNG liquid phase inlet; 2. Flange; 3. Stainless steel corrugated metal hose; 4. Unloading liquid phase pressurization line; 5. Cold insulation layer; 6. Shut-off valve; 7. Ambient air vaporizer; 8. Needle valve; 9. Two-valve manifold; 10. First valve; 11. Second valve; 12. Pressure gauge; 13. Buffer tank; 14. Sampling port; 15. Thermometer; 16. Gas phase pressurization line; 17. Gas phase outlet; 18. Venting line; 19. Gas-liquid interconnection line; 20. Safety valve; 21. Unloading BOG line. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example
[0018] As shown in the attached figure, an LNG sampling device based on LNG self-pressurization unloading process includes an LNG liquid phase inlet 1, a gas phase outlet 17, a stainless steel corrugated metal hose 3 connected to the LNG tanker's pressurized liquid phase interface, an unloading liquid phase pressurization pipeline 4, a vaporizer, a gas phase pressurization pipeline 16, and a stainless steel corrugated metal hose 3 connected to the LNG tanker's gas phase interface. The stainless steel corrugated metal hose 3 is characterized by being equipped with a flange 2 for connection; the unloading liquid phase pressurization pipeline 4 is equipped with a cold insulation layer 5, a shut-off valve 6, and a venting pipeline 18; the gas phase pressurization pipeline 16 is equipped with a two-valve assembly 9, a thermometer 15, a shut-off valve 6, a venting pipeline 18, a gas-liquid interconnection pipeline 19, and an unloading BOG pipeline 21; the two-valve assembly 9 is equipped with a pressure gauge 12 and is connected to a buffer tank 13; a sampling port 14 is provided after the buffer tank 13; and a safety valve 20 is installed inside the shut-off valve 6.
[0019] This invention is designed based on the LNG self-pressurization unloading process, thus requiring less equipment to be installed on the process pipeline. It also achieves the function of LNG sampling. Furthermore, this invention is highly practical and easy to operate. On-site operators can take samples at any time during the unloading of LNG tank trucks without the need for complicated operating procedures, providing a convenient and scientific method for actual production operations. Example
[0020] Based on Embodiment 1, the solution in Embodiment 1 will be further described in detail below, with reference to the specific working method described in detail:
[0021] As shown in the figure, in a preferred embodiment, the stainless steel corrugated metal hose 3 is equipped with a breakaway valve to prevent the pipeline from breaking when the LNG tanker starts unexpectedly. The stainless steel corrugated metal hose 3 is also equipped with a dedicated pipe support bracket to provide reliable support and protection for the metal hose during non-operational periods, preventing the metal hose from rubbing against the ground and preventing foreign objects such as gravel and dust from entering the pipeline.
[0022] As shown in the figure, in a preferred embodiment, the cold insulation layer 5 is made of heat insulation material, which is closely attached to the outer wall of the pipeline and can effectively inhibit the vaporization of LNG during transportation.
[0023] As shown in the figure, in a preferred embodiment, the vaporizer is an ambient temperature vaporizer 7 with a vaporization capacity of 400 Nm3 / Hr, which can ensure that LNG is completely vaporized after flowing through the vaporizer.
[0024] As shown in the figure, in a preferred embodiment, the two-valve group 9 has three interfaces, a first valve 10, and a second valve 11. One interface is connected to a pipeline as a channel for gas inflow. The second interface is used to mount a pressure gauge 12 to monitor the gas pressure status in real time. The third interface is connected to a buffer tank 13 for subsequent LNG gas sampling. Needle valves 8 are installed on both sides of the buffer tank 13. The first valve 10 is used to control the gas flow into the two-valve group 9, and the second valve 11 is used to control the gas flow into the buffer tank 13.
[0025] As shown in the figure, in a preferred embodiment, the buffer tank 13 can fully mix the incoming gas, making the LNG sampling more representative. The sampling port 14 is equipped with a compression fitting, which can realize the quick connection and disconnection of the sampling high-pressure hose.
[0026] The working process of this utility model is as follows:
[0027] When using this utility model:
[0028] Step 1: Guide the LNG tanker into the unloading parking area, place triangular wooden stakes and signs, connect the grounding wire, and after a safety inspection, connect the unloading liquid phase pressurization line 4 and gas phase pressurization line 16 of the LNG tanker's self-pressurization system, and connect the unloading liquid phase line.
[0029] Step 2: After completing the inspection, use the vent valve on the unloading platform to purge and replace the connecting pipelines;
[0030] Step 3: After purging, slowly open the shut-off valve 6 of the unloading liquid phase pressurization pipeline 4 and the shut-off valve 6 of the gas phase pressurization pipeline 16 in sequence to pressurize the LNG tanker.
[0031] Step 4: Observe the pressure value of the LNG tanker. When the pressure increases to the predetermined value, first slowly open the liquid inlet valve of the unloading platform to pre-cool the liquid phase pipeline of the unloading. After the pre-cooling is completed, slowly open the liquid inlet valve again.
[0032] Step 5: Observe the readings of pressure gauge 12 and temperature gauge 15 on the gas phase booster pipeline 16. If there is no abnormality, slowly open the needle valves 8 on both sides of the second valve 11 and the buffer tank 13 to allow gas to flow into the buffer tank 13 and purge the buffer tank 13.
[0033] Step 6: After purging, at sampling port 14, use a high-pressure hose to connect the ferrule connector, fill the sampling bag with gas, disconnect the connection, and empty the gas in the sampling bag. Repeat this operation three times, and finally perform formal sampling.
[0034] Step 7: After sampling, disconnect the high-pressure hose and then slowly close the needle valves 8 on both sides of the second valve 11 and the buffer tank 13;
[0035] Step 8: Connect the sampling bag to the gas chromatograph, start the detection program, and wait for the gas detection results;
[0036] Step 9: After unloading, perform the relevant operations according to the prescribed procedures.
[0037] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.
[0038] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.
[0039] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An LNG sampling device based on LNG self-pressurization unloading process, comprising an LNG liquid phase inlet (1), a gas phase outlet (17), a stainless steel corrugated metal hose (3) connected to the LNG tank truck pressurization liquid phase interface, an unloading liquid phase pressurization pipeline (4), a vaporizer, a gas phase pressurization pipeline (16), and a stainless steel corrugated metal hose (3) connected to the LNG tank truck gas phase interface, characterized in that, The stainless steel corrugated metal hose (3) is equipped with a flange (2) connection interface; the unloading liquid phase pressurization pipeline (4) is equipped with a cold insulation layer (5), a shut-off valve (6), and a venting pipeline (18); the gas phase pressurization pipeline (16) is equipped with a two-valve assembly (9), a thermometer (15), a shut-off valve (6), a venting pipeline (18), a gas-liquid interconnection pipeline (19), and an unloading BOG pipeline (21). The two-valve assembly (9) is equipped with a pressure gauge (12). The two-valve assembly (9) is connected to a buffer tank (13). A sampling port (14) is provided after the buffer tank (13). A safety valve (20) is provided inside the shut-off valve (6).
2. The LNG sampling device based on the LNG self-pressurization unloading process according to claim 1, characterized in that: The stainless steel corrugated metal hose (3) is equipped with a breakaway valve and a dedicated pipe support bracket.
3. The LNG sampling device based on the LNG self-pressurization unloading process according to claim 1, characterized in that: The cold insulation layer (5) is made of heat insulation material.
4. An LNG sampling device based on LNG self-pressurization unloading process according to claim 1, characterized in that: The vaporizer is an ambient temperature vaporizer (7) with a vaporization capacity of 400 Nm3 / Hr.
5. The LNG sampling device based on the LNG self-pressurization unloading process according to claim 1, characterized in that: The two-valve group (9) has three interfaces, a first valve (10) and a second valve (11). One interface is connected to a pipeline, the second interface is used to assemble a pressure gauge (12), and the third interface is connected to a buffer tank (13). Needle valves (8) are installed on both sides of the buffer tank (13).
6. The LNG sampling device based on the LNG self-pressurization unloading process according to claim 1, characterized in that: A ferrule connector is provided at the sampling port (14) interface.