A gas supply system for an LNG carrier

Abstract

The application relates to an LNG ship gas supply system, which comprises a storage tank and a spraying device; the spraying device comprises a first pipeline, the first pipeline is provided with a plurality of first nozzles which are arranged at intervals, the first nozzles of the first nozzles are arranged towards the storage tank and are used for spraying cooling medium to the storage tank; an outer wall of the storage tank is fixedly provided with a connecting portion, and the first pipeline is connected with the connecting portion. The scheme can improve the transportation convenience of the LNG ship gas supply system, can effectively solve the problem of ultra-high in the transportation process, and can reduce the field operation difficulty and cost.

Description

Technical Field

[0001] This application relates to the field of LNG gas supply technology, specifically to an LNG marine gas supply system. Background Technology

[0002] Storage tanks used to store LNG (liquefied natural gas) are the core components of LNG ship gas supply systems. During operation, due to the introduction of ambient heat and the evaporation of LNG itself, the pressure and temperature inside the storage tank will gradually increase. When the pressure or temperature inside the storage tank exceeds the safety threshold, the spray device needs to be activated quickly to cool and depressurize the storage tank.

[0003] As a safety feature of LNG ship gas supply systems, the spray system's primary function is to rapidly cool storage tanks in emergencies. When dangerous situations such as fires, tank overpressure, or LNG leaks occur in the LNG ship gas supply system, the spray system lowers the tank temperature by spraying a cooling medium onto the tank surface, preventing further LNG vaporization and maintaining stable tank pressure. The spray system can also be used for tank pre-cooling. Before filling the tank with LNG, it pre-cools the tank by spraying a cryogenic liquid (such as LNG), gradually lowering the tank temperature to a suitable low temperature for LNG storage and preventing damage to the tank materials due to sudden temperature changes.

[0004] Traditional spraying systems consist of a spray frame and spray pipes mounted on the frame. The spray pipes are equipped with spray holes, through which a cooling medium is sprayed onto the storage tank. If the spray frame is installed directly on the tank at the factory, the overall height will be too high, leading to excessive height issues during transportation. If the spray frame is transported to the site and then welded and installed, the welding quality cannot be guaranteed due to the complex on-site construction environment and the difficulty in controlling temperature and humidity. Furthermore, a temporary welding platform needs to be erected on-site with corresponding protective measures, increasing costs and affecting the construction period.

[0005] Therefore, how to improve the transportation convenience of LNG marine gas supply systems, avoid excessive height issues, and reduce on-site operation difficulty and costs are technical problems that urgently need to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this application is to provide an LNG marine gas supply system that can improve the transportation convenience of LNG marine gas supply systems, effectively solve the problem of excessive height during transportation, and reduce on-site operation difficulty and cost.

[0007] To solve the above-mentioned technical problems, this application provides an LNG marine gas supply system, including a storage tank and a spraying device; the spraying device includes a first pipeline, the first pipeline is provided with a plurality of first nozzles arranged at intervals, the first nozzles of the first nozzles are arranged facing the storage tank and are used to spray a cooling medium onto the storage tank; a connecting part is fixedly provided on the outer wall of the storage tank, and the first pipeline is connected to the connecting part.

[0008] The first pipeline is directly connected to the connection part fixed to the outer wall of the storage tank, so that the first pipeline can be installed close to the outer wall of the storage tank. The first pipeline occupies less space in the height direction, and there is no need to install a separate spray frame to support the spray pipeline. The cooling medium can be sprayed onto the storage tank through each first nozzle of the first pipeline. In this way, compared with the solution of installing a spray frame, the height of the first pipeline of the LNG marine gas supply system at the storage tank can be reduced in the installed state, thereby solving the problem of excessive height during transportation.

[0009] The first pipeline can be directly assembled to the storage tank at the factory and shipped with the equipment, which is convenient for transportation, can also reduce the difficulty of on-site construction, and reduce the cost of on-site component steel structure support.

[0010] Optionally, the first pipeline is detachably connected to the connecting part via a connector.

[0011] Optionally, the first pipeline extends along the length of the storage tank, and the storage tank is connected to at least two first pipelines through the connecting part, with each first pipeline spaced apart along the circumference of the storage tank.

[0012] Optionally, the first pipeline is provided with a plurality of first connectors at intervals along its length, the first nozzle is provided corresponding to the first connector, and the first nozzle and the first connector are detachably connected.

[0013] Optionally, the first nozzle is threadedly connected to the first connector.

[0014] Optionally, the first nozzle includes a first connecting pipe, a first connecting section and a first nozzle connected in sequence, the first connecting pipe being detachably connected to the first connector, and the first connecting pipe being connected to at least one of the first connecting sections.

[0015] Optionally, it also includes an air supply box; the spraying device further includes a main pipe and a second pipe, the main pipe being connected to the first pipe and the second pipe respectively, the second pipe being connected at intervals to a plurality of second nozzles, the second nozzles of each second nozzle being arranged toward the air supply box and used to spray cooling medium onto the air supply box.

[0016] Optionally, it also includes a bracket, which is disposed above the air supply box, and the second pipeline is disposed on the bracket.

[0017] Optionally, the second nozzle includes a second connecting pipe, a second connecting section, and a second nozzle connected in sequence. The second connecting pipe is connected to the second pipeline, and the second connecting pipe is connected to at least one of the second connecting sections.

[0018] Optionally, the side wall of the storage tank is provided with a jacket, and the first nozzle is used to spray cooling medium into the jacket. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the LNG marine gas supply system provided in the embodiments of this application;

[0020] Figure 2 This is a structural schematic diagram of an LNG marine gas supply system from another perspective;

[0021] Figure 3 yes Figure 2 Enlarged view of A in the middle;

[0022] Figure 4 yes Figure 2 A magnified view of B in the middle.

[0023] Appendix Figures 1-4 The reference numerals in the attached figures are explained as follows:

[0024] 1 storage tank;

[0025] 2 Sprinkler device, 21 First pipeline, 211 First connector, 22 First nozzle, 221 First connecting pipe, 222 First connecting section, 223 First nozzle, 23 Second pipeline, 24 Second nozzle, 241 Second connecting pipe, 242 Second connecting section, 243 Second nozzle, 25 Main pipe, 26 Flange;

[0026] 3. Connecting parts;

[0027] 4 connectors;

[0028] 5. Gas supply box;

[0029] 6. Cooling medium storage tank;

[0030] 7 supports. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Storage tanks used to store LNG (liquefied natural gas) are the core components of LNG ship gas supply systems. During operation, due to the introduction of ambient heat and the evaporation of LNG itself, the pressure and temperature inside the storage tank will gradually increase. When the pressure or temperature inside the storage tank exceeds the safety threshold, the spray device needs to be activated quickly to cool and depressurize the storage tank.

[0033] As a safety feature of LNG ship gas supply systems, the spray system's primary function is to rapidly cool storage tanks in emergencies. When dangerous situations such as fires, tank overpressure, or LNG leaks occur in the LNG ship gas supply system, the spray system lowers the tank temperature by spraying a cooling medium onto the tank surface, preventing further LNG vaporization and maintaining stable tank pressure. The spray system can also be used for tank pre-cooling. Before filling the tank with LNG, it pre-cools the tank by spraying a cryogenic liquid (such as LNG), gradually lowering the tank temperature to a suitable low temperature for LNG storage and preventing damage to the tank materials due to sudden temperature changes.

[0034] Traditional spraying devices include a spray frame and spray pipes installed on the spray frame. The spray pipes are equipped with spray holes, through which a cooling medium is sprayed onto the storage tank 1. If the spray frame is installed directly on the storage tank 1 at the factory, the overall height will be too high, and there will be problems with excessive height during transportation. If the spray frame is transported to the site and then welded and installed, the welding quality cannot be guaranteed due to the complex on-site construction environment and the difficulty in controlling temperature and humidity. In addition, a temporary welding platform needs to be built on-site and equipped with corresponding protective measures, which increases costs and affects the construction period.

[0035] This application provides an LNG marine gas supply system that allows for the direct installation of a spray device before delivery, reducing on-site operation difficulty and costs. Furthermore, it effectively solves the problem of excessive height during transportation.

[0036] like Figure 1 and Figure 2 As shown, the LNG marine gas supply system includes a storage tank 1 and a spray device 2. The spray device 2 includes a first pipeline 21, and a plurality of first nozzles 22 are arranged at intervals on the first pipeline 21. The first nozzles 223 of each first nozzle 22 are all directed toward the storage tank 1. The spray device 2 introduces a cooling medium into the first pipeline 21 and sprays it toward the storage tank 1 through the first nozzles 223 of each first nozzle 22 to cool the storage tank 1.

[0037] A connecting part 3 is fixedly provided on the outer wall of the storage tank 1. The first pipeline 21 is connected to the connecting part 3. The connecting part 3 is fixed to the outer wall of the storage tank 1. The first pipeline 21 is connected to the connecting part 3 to improve the installation stability of the first pipeline 21 and each first nozzle 22. The position of the connecting part 3 can be set according to the actual spraying position of the storage tank 1, which is flexible.

[0038] The first pipeline 21 is directly connected to the connecting part 3 fixed to the outer wall of the storage tank 1, so that the first pipeline 21 can be set close to the outer wall of the storage tank 1. The first pipeline 21 occupies less space in the height direction. There is no need to set up a separate spray frame to support the spray pipeline. The cooling medium can be sprayed onto the storage tank 1 through each first nozzle 22 of the first pipeline 21. In this way, compared with the solution of setting up a spray frame, the height of the LNG marine gas supply system at the storage tank 1 can be reduced when the first pipeline 21 is installed, thereby solving the problem of excessive height during transportation.

[0039] The first pipeline 21 can be directly assembled into the storage tank 1 at the time of shipment, and shipped with the equipment. This facilitates transportation, reduces the difficulty of on-site construction, and reduces the cost of on-site component steel structure support 7.

[0040] The first pipeline 21 is detachably connected to the connecting part 3 via the connector 4. This design facilitates the disassembly and assembly of the first pipeline 21 and makes it easier for future maintenance.

[0041] The connector 4 is connected to both the first pipe 21 and the connecting part 3. The connection between the connector 4 and the connecting part 3 can be detachable, such as by fasteners. In this case, there are no restrictions on the connection method between the connector 4 and the first pipe 21, such as by welding, fasteners, or clamping (such as clamps). Alternatively, the connection between the connector 4 and the first pipe 21 can be detachable, such as by fasteners or clamping. In this case, there are no restrictions on the connection method between the connector 4 and the connecting part 3, such as by welding or fasteners. Or, the connection between the connector 4 and the connecting part 3, as well as the connection between the connector 4 and the first pipe 21, can be detachable.

[0042] In this embodiment, the connecting part 3 is connected to the storage tank 1 by welding. This welding connection can be to the outer wall of the storage tank 1 or to a structural component (such as a lifting structure) located on the outer wall of the storage tank 1. Welding the connecting part 3 to the storage tank 1 ensures the structural stability between the connecting part 3 and the storage tank 1, thereby improving the connection stability between the first pipeline 21 and the storage tank 1.

[0043] In this embodiment, the structure of the connecting part 3 is not limited; it can be a pad or a beam, etc.

[0044] The first pipe 21 extends along the length of the storage tank 1. At least two first pipes 21 are connected to the storage tank 1 via connecting parts 3. Each first pipe 21 is spaced apart circumferentially around the storage tank 1 to increase the spraying area. The number of first pipes 21 can be set according to actual conditions. The number of connecting parts 3 can be the same as or different from the number of first pipes 21. For example, two first pipes 21 can be connected to the same connecting part 3, or... Figure 2 As shown, a first pipeline 21 can be connected to multiple connection parts 3 located in the storage tank 1.

[0045] like Figure 2 As shown, there are two first pipes 21, both located on the upper side of the storage tank 1. When the cooling medium being sprayed is a coolant (such as water), the coolant, after being sprayed onto the surface of the storage tank 1, will flow downwards along the surface of the storage tank 1 under the influence of gravity, thereby cooling other parts of the storage tank 1. In this way, the cooling effect can be improved while simplifying the structure of the spraying device 2. Of course, the first pipes 21 can also be arranged circumferentially along the storage tank 1, or the first pipes 21 can be spaced apart axially along the storage tank 1.

[0046] The layout and quantity of the first pipeline 21 can be flexibly adjusted according to the volume of the storage tank 1 and the space of the ship. The overall structure reduces space occupation and can be directly adapted to different scenarios such as inland waterway ships and ocean container ships without modifying the original structure of the ship, thus having high adaptability.

[0047] In this embodiment, there are no restrictions on the shape, structure, or position of the connecting part 3. For example, the connecting part 3 can be arranged along the circumference of the storage tank 1, and at least two connecting parts 3 can be spaced apart along the axial direction of the storage tank 1. The first pipeline 21 can be extended along the length direction of the storage tank 1 and connected to each connecting part 3 respectively.

[0048] The first conduit 21 has multiple first connectors 211 spaced apart along its length. Each first nozzle 22 is correspondingly connected to a first connector 211, and the first nozzle 22 is detachably connected to its corresponding first connector 211. The structure of the first connector 211 is not limited; it can be a connection hole opened in the side wall of the first conduit 21 or a first branch pipe connected to the first conduit 21. The first nozzle 22 and the first connector 211 are detachably connected. Alternatively, the first nozzle 22 and the first conduit 21 can be fixedly connected.

[0049] The detachable connection between the first nozzle 22 and the first connector 211 allows the first connector 211 to be used as a standard part, facilitating mass production and reducing costs. For different storage tanks 1, the length of the first pipeline 21 and the number of first connectors 211 may vary. Each first connector 211 can be fitted with one first nozzle 22, offering good flexibility. Furthermore, the detachable connection between the first nozzle 22 and the first connector 211 facilitates disassembly and maintenance. When a first nozzle 22 becomes clogged, the clogged nozzle 22 can be disassembled and cleaned individually, making the operation convenient and efficient.

[0050] In this embodiment, the first nozzle 22 and the first connector 211 are connected by a thread. During installation, the first nozzle 22 and the first connector 211 are simply inserted and rotated relative to each other. Of course, there are no restrictions on the connection method between the first nozzle 22 and the first connector 211. For example, they can also be connected by fasteners, flanges 26, snap-fit, etc. The threaded connection simplifies the structure and disassembly / assembly operations.

[0051] Furthermore, the first nozzle 22 and the first connector 211 are detachably connected, allowing the first nozzle 22 to be transported to the site for installation, thereby further reducing the overall height of the LNG marine gas supply system during transportation. The threaded connection between the first nozzle 22 and the first connector 211 facilitates operation and effectively improves on-site installation efficiency.

[0052] like Figure 3 As shown, the first nozzle 22 includes a first connecting pipe 221, a first connecting section 222, and a first nozzle 223 arranged in sequence. The first connecting pipe 221 is detachably connected to the first connector 211. The first connecting section 222 is provided with a bending structure so that the first nozzle 223 faces the storage tank 1 and sprays the cooling medium onto the storage tank 1. A certain distance is left between the first nozzle 223 and the storage tank 1 to increase the spray coverage area of ​​the first nozzle 223 on the surface of the storage tank 1. Thus, while ensuring the spray coverage area of ​​the spraying device 2 on the surface of the storage tank 1, the number of first nozzles 22 can be reduced, thereby simplifying the overall structure and reducing costs.

[0053] A first connecting pipe 221 may be connected to at least one first connecting segment 222, or the first connecting pipe 221 may be connected to only one first connecting segment 222. In this case, the first connecting pipe 221 and the first connecting segment 222 form a U-shaped or L-shaped structure, or it may be as follows: Figure 3 The first connecting pipe 221 shown is connected to two first connecting segments 222. At this time, the first connecting pipe 221 and the two first connecting segments 222 form a T-shaped or Y-shaped tee structure. Of course, the first connecting pipe 221 can also be connected to three or more first connecting segments 222 at the same time.

[0054] like Figure 1 and Figure 2 As shown, the LNG marine gas supply system also includes a gas supply tank 5, and the spray device 2 also includes a main pipe 25 and a second pipe 23. The main pipe 25 is connected to the cooling medium storage tank 6, the first pipe 21 and the second pipe 23 respectively. The second pipe 23 is connected to a plurality of second nozzles 24 at intervals, and the second nozzle 243 of each second nozzle 24 is arranged facing the gas supply tank 5.

[0055] The spray device 2 supplies cooling medium to the first pipeline 21 and the second pipeline 23 through the main pipe 25, and sprays cooling medium onto the storage tank 1 through the first nozzle 22 located on the first pipeline 21 to cool the storage tank 1. It also sprays cooling medium onto the air supply box 5 through the second nozzle 24 located on the second pipeline 23 to cool the air supply box 5.

[0056] Of course, in this embodiment, the first pipe 21 and the second pipe 23 can also be connected to the cooling medium storage tank 6 respectively, and the cooling medium storage tank 6 can be connected through the main pipe 25. The first pipe 21 and the second pipe 23 can be connected to the main pipe 25 respectively, which can reduce the connection structure of the cooling medium storage tank 6 and simplify the overall structure.

[0057] The first conduit 21 and the main conduit 25, as well as the second conduit 23 and the main conduit 25, can form an integrated structure or a separate structure, connected by plug-in joints, or, as... Figure 1 and Figure 2 As shown, connections can be made via flange 26. When connected via plug fitting or flange 26, the first pipe 21 and the second pipe 23 can each be equipped with an independent valve at the end facing the main pipe 25. When the first pipe 21 or the second pipe 23 malfunctions, the corresponding valve can be closed individually for maintenance without system shutdown, thus reducing losses.

[0058] like Figure 1 and Figure 2 As shown, the first pipe 21 and the second pipe 23 extend from the main pipe 25 in two opposite directions. The air supply box 5 is located in front of the storage tank 1. The main pipe 25 is connected to the front end of the first pipe 21, allowing water to enter the front end of the first pipe 21. The main pipe 25 is connected to the rear end of the second pipe 23, allowing water to enter the rear end of the second pipe 23, which facilitates pipe layout. Furthermore, the distributed water supply through the first pipe 21 and the second pipe 23 can further disperse resistance. Combined with the use of large-radius bends, the energy consumption of the power components (such as the spray pump) of the spray device 2 is reduced, lowering the performance requirements of the power components and thus reducing costs.

[0059] In this embodiment, flow regulating valves can also be installed in the first pipeline 21 and the second pipeline 23 respectively. A PID algorithm is used to adjust the flow rate of each module in real time, ensuring that the spray pressure deviation of all nozzles is within a preset range, such as ±5%. Laboratory tests show that 20m 3 After the spray device 2 is activated, the surface temperature of storage tank 1 drops from 50°C to 20°C within 30 seconds, with a cooling rate of 1°C / second, which is about 50% higher than the existing technology. Infrared thermal imaging detection shows that the spray coverage area reaches 98%, with no blind spots, meeting the emergency cooling standard.

[0060] like Figure 1 and Figure 2 As shown, the LNG marine gas supply system also includes a support 7, which is located above the gas supply box 5. The second pipeline 23 is located on the support 7. The support 7 can provide support for the second pipeline 23, so that the second pipeline 23 is located on the top of the gas supply box 5, which facilitates the second nozzle 24 to spray cooling medium onto the gas supply box 5.

[0061] Of course, in this embodiment, the support 7 may not be provided. Referring to the first pipeline 21 provided in the storage tank 1, a connecting structure is welded to the outer wall of the gas supply box 5, and the second pipeline 23 can be connected to the connecting structure. Since the height of the gas supply box 5 is less than the height of the storage tank 1, there is still a height margin at the top of the gas supply box 5. The second pipeline 23 can be supported by the support 7, which simplifies the structure of the gas supply box 5.

[0062] The bracket 7 and the second conduit 23 can be installed either before leaving the factory or on-site. The bracket 7 can be made of stainless steel, which can extend its service life.

[0063] The second conduit 23 may be equipped with a second connector, and the second nozzle 24 is correspondingly provided with the second connector. The second nozzle 24 and the corresponding second connector are detachably connected to improve flexibility and facilitate disassembly and assembly operations. It also facilitates the setting of the second nozzle 24 as a standard part to achieve mass production, thereby reducing costs. Alternatively, the second conduit 23 may not be equipped with a second connector, and the second nozzle 24 may be directly fixed to the second conduit 23.

[0064] The structure of the second nozzle 24 is similar to that of the first nozzle 22. The second nozzle 24 includes a second connecting pipe 241, a second connecting section 242, and a second nozzle 243 connected in sequence. The second connecting pipe 241 is connected to the second pipeline 23, and the second connecting pipe 241 is connected to at least one second connecting section 242. By providing a bending structure for the second connecting section 242, the second nozzle 243 can be directed towards the air supply box 5 and spray cooling medium onto the air supply box 5. A certain distance is left between the second nozzle 243 and the air supply box 5, increasing the spray coverage area of ​​the second nozzle 243 on the surface of the air supply box 5. This reduces the number of second nozzles 24 while ensuring the spray coverage area of ​​the spray device 2 on the surface of the air supply box 5, thereby simplifying the overall structure and reducing costs.

[0065] A second connector 241 may be connected to at least one second connected segment 242, or the second connector 241 may be connected to only one second connected segment 242. In this case, such as Figure 4 As shown, the second connector 241 and the second connecting segment 242 form a U-shaped or L-shaped structure. Alternatively, one second connector 241 can connect to two second connecting segments 242. In this case, the second connector 241 and the two second connecting segments 242 form a T-shaped or Y-shaped tee structure. Of course, the second connector 241 can also connect to three or more second connecting segments 242 at the same time.

[0066] The first pipe 21 used for spraying and cooling the storage tank 1 and the second pipe 23 used for spraying and cooling the air supply box 5 of the spray device 2 are each set as an independent module. When there are two or more first pipes 21, each first pipe 21 can be set as an independent module, or all the first pipes used for spraying and cooling the storage tank 1 can be integrated into one module. The height of each module can be controlled individually. The module containing the first pipe 21 can have its overall height reduced because the first pipe 21 is connected to the connecting part 3 and is close to the surface of the storage tank 1. The second pipe 23 has a margin in the height direction due to its location, and the total height of the module is easier to control. It can be set up through the connecting part 3 or through the bracket 7. The height of each module can be controlled individually, the structural design is more flexible, and it meets the conventional transportation height standards without the need for special over-limit measures. (Based on 20m) 3 Taking storage tank 1 as an example, since there is no issue with excessive height, transportation costs can be reduced by more than 30%, the delivery cycle can be shortened by 5-7 days, and route restrictions caused by exceeding limits can be avoided.

[0067] Modules can be connected via flange 26, such as between the first pipe 21 and the main pipe 25, or between the second pipe 23 and the main pipe 25. No on-site welding is required; on-site installation can be achieved with just two operators tightening bolts using torque wrenches. This reduces installation time per unit to less than one hour and decreases the workload by approximately 80%. Furthermore, during factory pre-assembly, a laser rangefinder ensures the accuracy of the flange 26 hole positions (error ≤ 2mm), completely eliminating the quality risks associated with on-site welding. The initial uniformity of spray coverage achieves a rate of over 95%.

[0068] In this embodiment, the side wall of the storage tank 1 may also be provided with a jacket, and the first nozzle 22 is used to spray cooling medium into the jacket. After the medium is sprayed into the jacket by the first nozzle 223 to cool the storage tank 1, when it flows out of the jacket, it can be recovered and cooled and then participate in heat exchange again, or it can be directly discharged.

[0069] In this embodiment, there are no restrictions on the cooling medium sprayed by the spraying device 2 through the first nozzle 22 and the second nozzle 24. It can be a liquid coolant, an inert gas (such as nitrogen), or a mist-like cooling medium.

[0070] When the storage tank 1 is cooled by inert gas, a jacket is provided on the side wall of the storage tank 1. A closed inert gas circulation pipeline system is constructed around the storage tank 1. The circulation pipeline system includes the first pipeline 21 mentioned above. The jacket is also connected to the circulation pipeline system. When an abnormal increase in temperature or pressure exceeding the safety threshold is detected in the storage tank 1, the low temperature and high pressure nitrogen gas is sprayed into the jacket through the spray device 2 by the valve control. Utilizing the heat absorption characteristics of nitrogen gas, the heat on the surface of the storage tank 1 is carried away. After heat exchange with the storage tank 1, the temperature of the nitrogen gas rises and then flows into the circulation pipeline from the jacket, thereby cooling the storage tank 1 and maintaining the pressure stability of the storage tank 1.

[0071] When the cooling medium is gas, a dedicated nitrogen storage tank (i.e., the aforementioned cooling medium storage tank 6) can be installed on the ship. Its design pressure and volume need to be calculated and determined according to the actual needs of the ship to ensure that a sufficient amount of nitrogen can be provided in an emergency. The nitrogen in the cooling medium storage tank 6 is connected to the jacket of the storage tank 1 through a high-pressure delivery pipeline. The circulation pipeline system includes a delivery pipeline connected to the cooling medium storage tank 6, which is connected to the first pipeline 21. Nitrogen can enter the jacket through the delivery pipeline and the first pipeline 21 to cool the storage tank 1. Pressure regulating valves, flow control valves, and check valves can also be installed on the delivery pipeline to precisely control the delivery pressure and flow rate of nitrogen and prevent gas backflow.

[0072] When nitrogen gas enters the jacket space, it absorbs heat from the surface of storage tank 1, causing its temperature to rise and its density to decrease. Utilizing this characteristic, an exhaust port is installed at the top of the jacket space, and an intake port is installed at the bottom, forming a natural convection circulation. Simultaneously, to enhance the cooling effect, a small circulating fan can be installed in the circulation pipeline to force the nitrogen gas to circulate, accelerating heat exchange. After the hot nitrogen gas is discharged from the exhaust port, it is cooled by a cooling device (such as an air cooler or a water-cooled heat exchanger), then pressurized by a compressor and returned to the jacket space of storage tank 1, achieving recycling.

[0073] The temperature and pressure data of storage tank 1 can be monitored in real time using temperature and pressure sensors. When the temperature or pressure of storage tank 1 exceeds the preset safety value, the control system automatically opens the nitrogen delivery valve and starts the cooling cycle. At the same time, the control system also has fault diagnosis and alarm functions, which can promptly detect and report fault information of components such as the nitrogen storage system, delivery pipeline, and circulation device.

[0074] Similarly, the gas supply box 5 can also be equipped with a jacket, and the second nozzle 24 of the second pipeline 23 injects nitrogen into the jacket to achieve cooling.

[0075] When the spray device 2 cools the storage tank 1 and the air supply box 5 with a spray-like cooling medium, the side walls of the storage tank 1 and the air supply box 5 are equipped with jackets. Taking the spray-like cooling medium sprayed by each first nozzle 22 of the spray device 2 onto the storage tank 1 as an example, the temperature distribution, pressure changes and environmental parameters (such as wind speed and humidity) on the surface of the storage tank 1 are monitored in real time by sensors. Based on these data, the control system accurately calculates the required spray volume and spray angle for each first nozzle 22, thereby achieving precise cooling of the storage tank 1.

[0076] Temperature sensors (such as infrared temperature sensors) can be uniformly installed on the surface of tank 1 to monitor the temperature distribution on the surface of tank 1 in real time. At the same time, pressure sensors are installed inside tank 1 to monitor the pressure inside tank 1 in real time. In addition, environmental monitoring equipment such as wind speed sensors and humidity sensors are installed on the ship deck to transmit environmental parameters to the control system in real time.

[0077] The first nozzle 223 of the first spray head 22 is specially designed to precisely adjust the spray volume and spray angle according to the instructions of the control system. The first spray head 22 is made of corrosion-resistant and low-temperature-resistant materials (such as 316L stainless steel) to ensure long-term stable operation in harsh environments. The liquid supply system consists of a storage tank, a liquid supply pump, a flow regulating valve, and pipelines. The cooling medium storage tank 6 stores the cooling medium (which can be water or a special coolant), and the liquid supply pump delivers the cooling medium to each first spray head 22 through pipelines. The flow regulating valve precisely controls the liquid supply flow of each spray head according to the instructions of the control system.

[0078] A control system based on artificial intelligence algorithms can be adopted, enabling real-time analysis and processing of data collected by sensors. By establishing a mathematical model between the temperature, pressure, and environmental parameters of tank 1, the system predicts the temperature change trend of tank 1 and automatically adjusts the working state of the first nozzle 22 according to a preset safety threshold. For example, when a rapid temperature increase is detected in a certain area of ​​tank 1, the control system automatically increases the spray volume of the first nozzle 22 in that area and adjusts the spray angle to concentrate the cooling medium on the high-temperature area, achieving precise cooling. Simultaneously, the control system also has remote monitoring and operation functions, allowing crew members to remotely control and monitor the spray system via a control console in the ship's bridge or a mobile app.

[0079] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0081] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0082] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An LNG marine gas supply system, characterized in that, Includes a storage tank (1) and a spraying device (2); The spraying device (2) includes a first pipeline (21), the first pipeline (21) is provided with a plurality of first nozzles (22) spaced apart, the first nozzles (223) of the first nozzles (22) are arranged toward the storage tank (1) and are used to spray cooling medium onto the storage tank (1); The outer wall of the storage tank (1) is fixed with a connecting part (3), and the first pipeline (21) is connected to the connecting part (3).

2. The LNG marine gas supply system according to claim 1, characterized in that, The first pipeline (21) is detachably connected to the connecting part (3) via a connector (4).

3. The LNG marine gas supply system according to claim 1, characterized in that, The first pipeline (21) extends along the length of the storage tank (1), and the storage tank (1) is connected to at least two first pipelines (21) through the connecting part (3). Each first pipeline (21) is arranged at intervals along the circumference of the storage tank (1).

4. The LNG marine gas supply system according to any one of claims 1-3, characterized in that, The first pipeline (21) is provided with a plurality of first connectors (211) at intervals along its length direction. The first nozzle (22) is provided corresponding to the first connector (211), and the first nozzle (22) and the first connector (211) are detachably connected.

5. The LNG marine gas supply system according to claim 4, characterized in that, The first nozzle (22) is threadedly connected to the first connector (211).

6. The LNG marine gas supply system according to claim 4, characterized in that, The first nozzle (22) includes a first connecting pipe (221), a first connecting section (222) and a first nozzle (223) connected in sequence. The first connecting pipe (221) is detachably connected to the first connector (211), and the first connecting pipe (221) is connected to at least one of the first connecting sections (222).

7. The LNG marine gas supply system according to any one of claims 1-3, characterized in that, It also includes the gas supply box (5); The spray device (2) further includes a main pipe (25) and a second pipe (23). The main pipe (25) is connected to the first pipe (21) and the second pipe (23) respectively. The second pipe (23) is connected to a plurality of second nozzles (24) at intervals. The second nozzle (243) of each second nozzle (24) is arranged facing the air supply box (5) and is used to spray cooling medium into the air supply box (5).

8. The LNG marine gas supply system according to claim 7, characterized in that, It also includes a bracket (7), which is located above the air supply box (5), and the second pipeline (23) is located on the bracket (7).

9. The LNG marine gas supply system according to claim 7, characterized in that, The second nozzle (24) includes a second connecting pipe (241), a second connecting section (242) and a second nozzle (243) connected in sequence. The second connecting pipe (241) is connected to the second pipeline (23) and the second connecting pipe (241) is connected to at least one second connecting section (242).

10. The LNG marine gas supply system according to any one of claims 1-3, characterized in that, The storage tank (1) has a jacket on its side wall, and the first nozzle (22) is used to spray cooling medium into the jacket.

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