Filling device for LNG fuel ship

Abstract

The utility model relates to the technical field of storage and distribution of liquefied gas, and particularly discloses a filling device for an LNG (liquefied natural gas) fuel ship, which comprises a gasification pry, a filling pry, a waste gas treatment mechanism, an input pipeline and a discharge pipeline, the input pipeline is used for connecting the LNG fuel ship with the gasification pry and the filling pry; the discharge pipeline is used for connecting the LNG fuel ship and the waste gas treatment mechanism; the gasification pry comprises a first flow guide pipeline, a second flow guide pipeline and a first return pipeline; the first flow guide pipeline is used for connecting the LNG tank car or the liquid nitrogen tank car with the input pipeline, and a gasifier is arranged on the first flow guide pipeline; the second flow guide pipeline is used for connecting the LNG tank car or the liquid nitrogen tank car with the input pipeline; the two ends of the first backflow pipeline are used for being connected with an LNG tank car or a liquid nitrogen tank car, and the first backflow pipeline is connected with the gasifier. The filling pry comprises a flow guide pipe group, an auxiliary pipeline and an immersed pump; the flow guide pipe group is used for connecting the LNG tank car and the immersed pump; the auxiliary pipeline is used for a critical input pipeline and an immersed pump; and the immersed pump is connected with the LNG fuel ship.

Description

Technical Field

[0001] This utility model relates to the technical field of liquefied gas storage and distribution, and more particularly to a refueling device for LNG fuel ships. Background Technology

[0002] LNG, or liquefied natural gas, is typically stored at around -160°C. Due to its low temperature and volatility, it poses certain risks to ships using it for propulsion during refueling and operation. LNG-fueled ships generally require liquid nitrogen precooling, purging, and initial LNG refueling at the shipyard. The fuel tanks must be precooled and purged before the initial LNG refueling to ensure the temperature is suitable for storing LNG and to avoid safety issues and equipment damage caused by excessive temperature differences. Current technology typically uses a vaporization skid for fuel tank precooling and a pump skid for refueling. However, the vaporization skid is often idle when the pump skid is used for refueling, resulting in low utilization of various parts of the equipment and low LNG refueling efficiency. Utility Model Content

[0003] In view of this, the present invention provides a refueling device for LNG-fueled ships to solve the technical problems mentioned in the background art.

[0004] To achieve one or more of the above objectives or other objectives, this utility model proposes: a refueling device for LNG-fueled ships, which provides gas or liquid to LNG-fueled ships by connecting to LNG tank trucks or liquid nitrogen tank trucks. The refueling device for LNG-fueled ships includes: a vaporization skid, a refueling skid, an exhaust gas treatment mechanism, an input pipeline, and an exhaust pipeline.

[0005] One end of the input pipeline is connected to the LNG fuel ship, and the other end of the input pipeline is used to connect to the gasification skid and the refueling skid;

[0006] The discharge pipeline is used to connect the LNG fuel ship and the exhaust gas treatment facility;

[0007] The vaporization skid includes a first guide pipe, a second guide pipe, and a first return pipe;

[0008] One end of the first guide pipe is used to connect to an LNG tanker or a liquid nitrogen tanker, and the other end of the first guide pipe is connected to the input pipe. A vaporizer is provided on the first guide pipe.

[0009] One end of the second guide pipe is used to connect to an LNG tanker or liquid nitrogen tanker, and the other end of the second guide pipe is connected to the input pipe;

[0010] The two ends of the first return pipeline are used to connect to LNG tank trucks or liquid nitrogen tank trucks, and the first return pipeline is connected to the vaporizer;

[0011] The filling skid includes a flow guide assembly, auxiliary pipelines, and a submersible pump;

[0012] The guide pipe assembly is used to connect the LNG tanker and the submersible pump;

[0013] One end of the auxiliary pipeline is connected to the input pipeline, and the other end of the auxiliary pipeline is connected to the submersible pump;

[0014] The submersible pump can be connected to the LNG fuel ship via the input pipeline.

[0015] Preferably, the first diversion pipeline, the second diversion pipeline, and the first return pipeline are each equipped with a cryogenic shut-off valve and a breakaway valve at the end connected to the LNG tanker or liquid nitrogen tanker.

[0016] Preferably, the second flow guide pipe is also provided with a check valve.

[0017] Preferably, the vaporization skid further includes a third guide pipe, one end of which is used to connect to an external liquid nitrogen tanker, and the other end of which is connected to the input pipe. The third guide pipe shares the same breakaway valve with the first guide pipe, and the third guide pipe is also equipped with a cryogenic shut-off valve.

[0018] Preferably, the first guide pipe, the second guide pipe, the third guide pipe and the first return pipe in the gasification skid are each provided in at least two sets.

[0019] Preferably, the diversion pipe assembly includes a second return pipe and a fourth diversion pipe; both ends of the second return pipe are connected to the LNG tanker truck, and a booster is provided on the second return pipe; one end of the fourth diversion pipe is connected to the LNG tanker truck, and the other end of the fourth diversion pipe is connected to the submersible pump.

[0020] Preferably, the filling skid further includes a first vent pipe and a second vent pipe. One end of the first vent pipe is connected to the booster and the submersible pump, respectively, and the other end of the first vent pipe is connected to the discharge pipe. A heater is provided on the first vent pipe. One end of the second vent pipe is connected to the submersible pump, and the other end of the second vent pipe is connected to the discharge pipe. Both the first vent pipe and the second vent pipe are provided with a cryogenic shut-off valve.

[0021] Preferably, the waste gas treatment mechanism includes a heating skid and a continuous flare system;

[0022] The heating skid is used to connect the discharge pipeline and the long-burning flare system, and the heating skid is equipped with a water bath heater.

[0023] The permanent flare system is used to treat and discharge waste gas.

[0024] Preferably, the vaporization skid, the filling skid, and the heating skid all have mounting housings.

[0025] Preferably, the vaporization skid, the filling skid, and the heating skid are all equipped with leak alarms and explosion-proof lights.

[0026] Implementing the embodiments of this utility model will have the following beneficial effects:

[0027] After adopting the above scheme, the vaporization skid is used to perform pre-cooling and purging operations on the fuel tanks inside the LNG-fueled vessel. For short-distance, low-pressure LNG refueling operations, the LNG tanker can be parked at the vaporization skid, and the refueling operation can be performed using the skid. For long-distance, high-pressure LNG refueling operations, the vaporization skid serves as a transfer fluid path for the submersible pump of the refueling skid, providing LNG to the submersible pump and improving its inlet efficiency, thereby completing the LNG refueling operation on the fuel tanks. In summary, the multi-pipeline design of the vaporization skid in this unit allows it to perform pre-cooling and purging operations, as well as short-distance LNG refueling operations. Furthermore, during long-distance LNG refueling operations, it can assist the refueling skid in completing the LNG refueling operation, improving the refueling efficiency of long-distance LNG refueling operations. The multi-functional vaporization skid increases the utilization rate of all parts of the entire unit, resulting in a more efficient refueling process. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] in:

[0030] Figure 1 This is a schematic diagram of the overall piping logic in the embodiment;

[0031] Figure 2 This is a schematic diagram of the overall piping in the embodiment;

[0032] Figure 3 This is a schematic diagram of the piping of the vaporization skid in the embodiment;

[0033] Figure 4 This is a frontal projection view of the structure of the vaporization skid in the embodiment;

[0034] Figure 5 This is a schematic diagram of the piping of the filling skid in the embodiment;

[0035] Figure 6This is a schematic diagram of the filling skid in the embodiment;

[0036] Figure 7 This is a schematic diagram of the precooling line one in the embodiment;

[0037] Figure 8 This is a schematic diagram of the precooling line two in the embodiment;

[0038] Figure 9 This is a schematic diagram of the precooling line three in the embodiment;

[0039] Figure 10 This is a schematic diagram of the first refueling line in the embodiment;

[0040] Figure 11 This is a schematic diagram of the second refueling line in the embodiment;

[0041] Figure 12 This is a schematic diagram of the refueling line three in the embodiment.

[0042] Figure label:

[0043] 1. Vaporization skid; 10. First return line; 11. First guide line; 12. Second guide line; 13. Third guide line; 14. Vaporizer

[0044] 2. Filling skid; 20. Second return line; 21. Fourth guide line; 22. Intensifier; 23. Heater; 24. Submersible pump; 25. Auxiliary line; 26. First vent line; 27. Second vent line;

[0045] 3. Inlet piping;

[0046] 4. Discharge pipeline;

[0047] 5. Heat the skid;

[0048] 6. Perpetual torch system;

[0049] 7. Protective casing. Detailed Implementation

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0053] As attached Figure 1-12 As shown, this utility model embodiment provides a refueling device for LNG-fueled ships, which supplies gas or liquid to LNG-fueled ships by connecting to LNG tank trucks or liquid nitrogen tank trucks. The refueling device includes: a vaporization skid 1, a refueling skid 2, an exhaust gas treatment mechanism, an input pipeline 3, and an exhaust pipeline 4; one end of the input pipeline 3 is connected to the LNG-fueled ship, and the other end is used to connect the vaporization skid 1 and the refueling skid 2; the exhaust pipeline 4 is used to connect the LNG-fueled ship and the exhaust gas treatment mechanism; the vaporization skid 1 includes a first guide pipeline 11, a second guide pipeline 12, and a first return pipeline 10; one end of the first guide pipeline 11 is used to connect to an external LNG tank truck or liquid nitrogen tank truck, the second guide pipeline 12, the third guide pipeline 13, the fourth guide pipeline 14, the fifth guide pipeline 15, the sixth guide pipeline 16, the seventh guide pipeline 17, the eighth guide pipeline 18, the ninth guide pipeline 19, the eleventh guide pipeline 10, the eleventh guide pipeline 11, the eleventh guide pipeline 11, the eleventh guide pipeline 12, the eleventh guide pipeline 13, the eleventh guide pipeline 14, the eleventh guide pipeline 15, the eleventh guide pipeline 16, the eleventh guide pipeline 17, the eleventh guide pipeline 18, the eleventh guide pipeline 19 ... One end of a first guide pipe 11 is connected to the input pipe 3, and a vaporizer 14 is provided on the first guide pipe 11; one end of the second guide pipe 12 is used to connect to an LNG tanker or a liquid nitrogen tanker, and the other end of the second guide pipe 12 is connected to the input pipe 3; both ends of the first return pipe 10 are used to connect to an LNG tanker or a liquid nitrogen tanker, and the first return pipe 10 is connected to the vaporizer 14; the refueling skid 2 includes a guide pipe assembly, an auxiliary pipe 25, and a submersible pump 24; the guide pipe assembly is used to connect the LNG tanker and the submersible pump 24; one end of the auxiliary pipe 25 is connected to the input pipe 3, and the other end of the auxiliary pipe 25 is connected to the submersible pump 24; the submersible pump 24 can be connected to an LNG fuel ship through the input pipe 3.

[0054] Specifically, LNG-fueled ships generally have fuel tanks. Before refueling the fuel tanks with LNG, pre-cooling and purging operations need to be completed to ensure safe refueling. To complete the various operations on the fuel tanks, the inlet pipe 3 connects to the vaporization skid 1 and the refueling skid 2, allowing the gas or liquid from the corresponding LNG tanker or liquid nitrogen tanker to be stably input into the fuel tanks. During the above operations, some exhaust gas is generated. This is connected to the fuel tank and the exhaust gas treatment mechanism through the outlet pipe 4, allowing the exhaust gas discharged from the fuel tanks to be safely transported to the exhaust gas treatment mechanism for treatment and safe discharge. To improve the safety and controllability of the pipelines, both the inlet pipe 3 and the outlet pipe 4 are equipped with shut-off valves near the LNG-fueled ship. To avoid vaporization, reduce heat loss, and for safety reasons, the fuel tanks need to be pre-cooled. In this embodiment, the liquid nitrogen tanker is first parked at the vaporization skid 1, and the fuel tank is pre-cooled by connecting the liquid nitrogen tanker and the inlet pipe 3 through the vaporization skid 1. Figure 7 As shown in the pre-cooling line one (arrows indicate fluid guidance), liquid nitrogen from the liquid nitrogen tanker is vaporized and heated by the vaporizer 14 in the first guide pipe 11 to form nitrogen gas below ambient temperature. This gas is then transported to the fuel tank of the LNG fuel ship via the input pipe 3. After heat exchange between the nitrogen gas and the fuel tank, preliminary pre-cooling is completed. Finally, the exhaust nitrogen gas from the fuel tank is transported to the exhaust gas treatment facility for treatment and safe discharge via the discharge pipe 4. When final heat exchange pre-cooling of the fuel tank is required, other methods can be used... Figure 9 The precooling line three shown (arrows indicate fluid guidance) specifically involves the second guide pipe 12 directly connecting the liquid nitrogen tanker and the input pipe 3. By controlling the valves of the liquid nitrogen tanker, a larger amount of liquid nitrogen is directly supplied, further enhancing the precooling effect on the fuel tank. After completing the precooling operation of the fuel tank, the LNG tanker can be parked at the vaporization skid 1. At this time, the following method is used... Figure 10 The refueling line shown (arrows indicate fluid guidance) is used for LNG replacement, not for LNG refueling. Specifically, the first return line 10 and the second guide line 12 perform the fuel tank replacement operation. The LNG tanker flows by gravity through the first return line 10, and the vaporizer 14 on the first return line 10 vaporizes and heats the LNG, forming vaporized natural gas. The entire LNG tanker is pressurized and vaporized. The vaporized natural gas is transported to the fuel tank through the second guide line 12 and the input line 3. Nitrogen remaining in the fuel tank is squeezed out from the top of the fuel tank by the denser vaporized natural gas. A natural gas concentration monitoring instrument can be installed at the fuel tank so that the replacement operation is completed when the natural gas reaches a specified threshold. During this process, the mixed gas, including nitrogen and vaporized natural gas, discharged from the fuel tank is transported to the exhaust gas treatment facility through the discharge line 4 for treatment and safe discharge. After the fuel tank replacement operation is completed, LNG can be refueled by parking the LNG tanker at the vaporization skid 1. Figure 10 The refueling route shown is Line 1 (arrows indicate fluid guidance). Line 1 is used for short-distance LNG refueling. LNG is refueled into the fuel tank via the first return line 10 and the second guide line 12. Specifically, the LNG tanker flows by gravity through the first return line 10. The vaporizer 14 on the first return line 10 is used for vaporization pressurization to increase the pressure in the LNG tanker. Then, the LNG from the LNG tanker is transported to the fuel tank via the second guide line 12 and the input line 3, thus refueling the fuel tank. It should be noted that this route is mainly for situations where the fuel tank refueling distance is short, the altitude is low, and the pressure is low. It is suitable for short-distance, low-altitude, and low-pressure refueling operations. For situations where the transport distance, altitude, and pressure requirements are high, and the vaporization skid 1 cannot meet these requirements, the vaporization skid 1 can transfer the LNG from the LNG tanker to the submersible pump 24 of the refueling skid 2, increasing the liquid intake capacity of the submersible pump 24. The submersible pump 24 then refuels the fuel tank. Specifically, this can be achieved using... Figure 11 The second refueling route shown (arrows indicate fluid guidance) first refuels the fuel tank with LNG through the first return line 10 and the second diversion line 12. Specifically, the LNG tanker flows by gravity through the first return line 10. The vaporizer 14 on the first return line 10 is used for vaporization pressurization to increase the pressure of the LNG tanker. Then, the LNG from the LNG tanker is transported to the submersible pump 24 through the second diversion line 12, the input line 3, and the auxiliary line 25. At the same time, more LNG tankers can be parked at the diversion line group of the refueling skid 2 to provide more LNG to the submersible pump 24. Finally, the refueling of the fuel tank is completed by the submersible pump 24. This route, through the combination of the vaporization skid 1 and the refueling skid 2, enables the refueling of the fuel tank with LNG under conditions with higher requirements for transport distance, altitude, and pressure. It makes reasonable use of the pipeline of the vaporization skid 1, realizes the repeated use of the pipeline, and improves work efficiency.

[0055] In summary, this embodiment uses vaporization skid 1 to perform pre-cooling and purging operations on the fuel tanks of LNG-fueled ships. For short-distance, low-pressure LNG refueling operations, the LNG tanker can be parked at vaporization skid 1, and the fuel tanks can be refueled using vaporization skid 1. For long-distance, high-pressure LNG refueling operations, vaporization skid 1 serves as a transfer fluid path for the submersible pump 24 of refueling skid 2, providing LNG to the submersible pump 24, improving the inlet efficiency of the submersible pump 24, and thus completing the LNG refueling operation on the fuel tanks. In general, the multiple pipeline design of vaporization skid 1 in this device enables it to perform pre-cooling and purging operations, as well as short-distance LNG refueling operations. Furthermore, during long-distance LNG refueling operations, it can assist refueling skid 2 in completing the LNG refueling operation, improving the refueling efficiency of long-distance LNG refueling operations. The multi-functional reusable vaporization skid 1 increases the utilization rate of all parts of the entire device, resulting in a more efficient refueling process.

[0056] To further improve the safety of each pipeline, the first diversion pipeline 11, the second diversion pipeline 12, and the first return pipeline 10 are all equipped with a cryogenic shut-off valve and a breakaway valve at the end connected to the LNG tanker or liquid nitrogen tanker. Specifically, one end of the first return pipeline 10 shares the same cryogenic shut-off valve and breakaway valve as the first guide pipeline 11, while the other end of the first return pipeline 10 has its own independent cryogenic shut-off valve and breakaway valve, allowing the vaporization skid 1 to share the same vaporizer 14 in this part. The cryogenic shut-off valve is mainly used to control and protect the pipeline from the effects of ultra-low temperatures of liquid nitrogen or LNG. In the event of abnormal temperature or leakage, it promptly cuts off the liquid flow to prevent damage to the pipeline, equipment, or even operators caused by the low temperature. The breakaway valve is mainly used to automatically cut off the fluid transport when the pipeline encounters accidental breakage or excessive tension, preventing liquid nitrogen or LNG leakage and avoiding accidents such as fires and explosions. In particular, since the second guide pipeline 12 is mainly used for direct transport of liquid nitrogen or LNG, a check valve is also provided on the second guide pipeline 12 to prevent liquid nitrogen or LNG backflow from damaging the tank truck and to help maintain unidirectional flow during the refueling process, avoiding changes in flow rate caused by fluid backflow, thereby improving refueling efficiency and ease of operation.

[0057] Additionally, the fuel tank can be pre-cooled using cryogenic nitrogen and a small amount of liquid nitrogen between nitrogen pre-cooling and liquid nitrogen pre-cooling. This avoids damage to the fuel tank caused by a drastic temperature change due to the direct injection of a large amount of liquid nitrogen after nitrogen pre-cooling. Specific methods include... Figure 8The precooling line 2 shown (arrows indicate fluid guidance), i.e., the vaporization skid 1, also includes a third guide pipe 13. One end of the third guide pipe 13 is used to connect to the liquid nitrogen tanker, and the other end of the third guide pipe 13 is connected to the input pipe 3. The third guide pipe 13 and the first guide pipe 11 share the same break valve. The third guide pipe 13 is also equipped with a cryogenic shut-off valve. The cryogenic nitrogen or a small amount of liquid nitrogen in the liquid nitrogen tanker is finally transported to the fuel tank through the third guide pipe 13 and the input pipe 3 under the action of pressure difference. The cryogenic nitrogen or a small amount of liquid nitrogen exchanges heat with the fuel tank to complete the precooling. The cryogenic nitrogen or a small amount of liquid nitrogen after heat exchange is transported to the exhaust gas treatment unit for treatment and safe discharge through the discharge pipe 4. In summary, this embodiment precools the fuel tank step by step through precooling line one, precooling line two, and precooling line three. After the temperature of the fuel tank reaches the specified requirements, LNG replacement is completed using refueling line one. Finally, depending on the transmission distance, refueling line one can be selected for short-distance LNG refueling, or refueling line two can be selected for long-distance LNG refueling. Of course, refueling line three, which will be described later, can also be used to further improve the refueling efficiency of the device.

[0058] To further improve the conveying capacity of the gasification skid 1, in this embodiment, the first guide pipe 11, the second guide pipe 12, the third guide pipe 13 and the first return pipe 10 in the gasification skid 1 are each provided with at least two sets. The multiple sets of configurations allow the gasification skid 1 to accommodate more liquid nitrogen tank trucks or LNG tank trucks, thereby improving the overall liquid transport capacity and efficiency.

[0059] like Figure 12 The filling line shown is three (arrows indicate fluid guidance). The guide pipe assembly includes a second return pipe 20 and a fourth guide pipe 21. Both ends of the second return pipe 20 are connected to LNG tank trucks, and a booster 22 is installed on the second return pipe 20. One end of the fourth guide pipe 21 is connected to an LNG tank truck, and the other end of the fourth guide pipe 21 is connected to a submersible pump 24. Specifically, the second return line 20 and the fourth guide line 21 are each equipped with two sets to increase the number of LNG tank trucks that can be docked and improve the liquid intake capacity. Specifically, the LNG in the LNG tank truck docked at the refueling skid 2 enters the booster 22 of the refueling skid 2 through the second return line 20 for vaporization and pressurization, and the LNG tank truck is in the gas phase. Under the action of pressure difference, the LNG in the LNG tank truck enters the submersible pump 24 through the fourth guide line 21 of the refueling skid 2. Finally, the submersible pump 24 is mechanically pressurized and enters the fuel tank through the input line 3 to complete the refueling operation. During this process, the vaporization skid 1 can also provide the corresponding LNG to the submersible pump 24 through the auxiliary line 25 to improve the liquid intake capacity of the submersible pump 24, thereby improving the refueling efficiency of the device to the fuel tank.

[0060] Since the submersible pump 24 requires gas return and continuous gas return to ensure normal operation, the refueling skid 2 also includes a first vent pipe 26 and a second vent pipe 27. One end of the first vent pipe 26 is connected to the booster 22 and the submersible pump 24, and the other end of the first vent pipe 26 is connected to the discharge pipe 4. A heater 23 is provided on the first vent pipe 26. One end of the second vent pipe 27 is connected to the submersible pump 24, and the other end of the second vent pipe 27 is connected to the discharge pipe 4. Both the first vent pipe 26 and the second vent pipe 27 are equipped with cryogenic shut-off valves. The first vent pipe 26 is mainly suitable for situations where the LNG tanker pressure is high and the liquid level is low, and it can solve the problem of poor gas return from the submersible pump 24. The second vent pipe 27 is mainly used for situations where the LNG tanker pressure is low and the liquid level is high.

[0061] See appendix Figure 2 The exhaust gas treatment mechanism includes a heating skid 5 and a continuous flare system 6. The heating skid 5 is used to connect the discharge pipe 4 and the continuous flare system 6, and a water bath heater is installed inside the heating skid 5. The continuous flare system 6 is used to treat and discharge exhaust gas. The heating skid 5 and the continuous flare system 6 can use existing exhaust gas treatment processes to safely treat and discharge exhaust gas, which will not be elaborated here.

[0062] To facilitate the installation of internal pipes and valves, the vaporization skid 1, the filling skid 2, and the heating skid 5 are all equipped with mounting housings 7, and each of the vaporization skid 1, the filling skid 2, and the heating skid 5 is equipped with a leak alarm and an explosion-proof light, thereby improving the safety and reliability of the device.

[0063] It should also be noted that the liquid outlets of both the vaporization skid 1 and the filling skid 2 are equipped with flow meters, which can monitor the output flow rate in real time. Each valve will also automatically open and close according to the real-time flow rate to ensure that no limit is exceeded. In addition, a turbine flow meter and a temperature transmitter are installed at the outlet of the heating skid 5, which can monitor the amount of gas output to the long-burning flare system 6 in real time. An alarm will be triggered when the limit is exceeded or approached. If the limit is exceeded to a certain extent, the gas supply to the entire device can be cut off.

[0064] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A refueling device for LNG-fueled ships, which supplies gas or liquid to LNG-fueled ships by connecting to LNG tank trucks or liquid nitrogen tank trucks, characterized in that, The refueling unit for LNG-fueled ships includes: a vaporization skid, a refueling skid, an exhaust gas treatment mechanism, an inlet pipeline, and an outlet pipeline; One end of the input pipeline is connected to the LNG fuel ship, and the other end of the input pipeline is used to connect to the gasification skid and the refueling skid; The discharge pipeline is used to connect the LNG fuel ship and the exhaust gas treatment facility; The vaporization skid includes a first guide pipe, a second guide pipe, and a first return pipe; One end of the first guide pipe is used to connect to an LNG tanker or a liquid nitrogen tanker, and the other end of the first guide pipe is connected to the input pipe. A vaporizer is provided on the first guide pipe. One end of the second guide pipe is used to connect to an LNG tanker or liquid nitrogen tanker, and the other end of the second guide pipe is connected to the input pipe; The two ends of the first return pipeline are used to connect to LNG tank trucks or liquid nitrogen tank trucks, and the first return pipeline is connected to the vaporizer; The filling skid includes a flow guide assembly, auxiliary pipelines, and a submersible pump; The guide pipe assembly is used to connect the LNG tanker and the submersible pump; One end of the auxiliary pipeline is connected to the input pipeline, and the other end of the auxiliary pipeline is connected to the submersible pump; The submersible pump can be connected to the LNG fuel ship via the input pipeline.

2. The refueling apparatus for LNG-fueled ships according to claim 1, characterized in that, The first diversion pipeline, the second diversion pipeline, and the first return pipeline are all equipped with a cryogenic shut-off valve and a breakaway valve at the end connected to the LNG tanker or liquid nitrogen tanker.

3. The refueling apparatus for LNG-fueled ships according to claim 2, characterized in that, The second flow guide line is also equipped with a check valve.

4. The refueling apparatus for LNG-fueled ships according to claim 2, characterized in that, The vaporization skid also includes a third flow guide pipe, one end of which is used to connect to an external liquid nitrogen tanker, and the other end of which is connected to the input pipe. The third flow guide pipe shares the same break-off valve with the first flow guide pipe, and the third flow guide pipe is also equipped with a cryogenic shut-off valve.

5. The refueling apparatus for LNG-fueled ships according to claim 4, characterized in that, The gasification skid contains at least two sets of the first guide pipe, the second guide pipe, the third guide pipe, and the first return pipe.

6. The refueling apparatus for LNG-fueled ships according to claim 4, characterized in that, The diversion pipe assembly includes a second return pipe and a fourth diversion pipe; both ends of the second return pipe are connected to the LNG tanker truck, and a booster is provided on the second return pipe; one end of the fourth diversion pipe is connected to the LNG tanker truck, and the other end of the fourth diversion pipe is connected to the submersible pump.

7. The refueling apparatus for LNG-fueled ships according to claim 6, characterized in that, The filling skid also includes a first vent pipe and a second vent pipe. One end of the first vent pipe is connected to the booster and the submersible pump, and the other end of the first vent pipe is connected to the discharge pipe. A heater is provided on the first vent pipe. One end of the second vent pipe is connected to the submersible pump, and the other end of the second vent pipe is connected to the discharge pipe. Both the first vent pipe and the second vent pipe are equipped with a cryogenic shut-off valve.

8. The refueling apparatus for LNG-fueled ships according to claim 4, characterized in that, The exhaust gas treatment system includes a heating skid and a continuous flare system. The heating skid is used to connect the discharge pipeline and the long-burning flare system, and the heating skid is equipped with a water bath heater. The permanent flare system is used to treat and discharge waste gas.

9. The refueling apparatus for LNG-fueled ships according to claim 8, characterized in that, The vaporization skid, filling skid, and heating skid all have mounting housings.

10. The refueling apparatus for LNG-fueled ships according to claim 8, characterized in that, The vaporization skid, filling skid, and heating skid are all equipped with leak alarms and explosion-proof lights.

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