Sea-based platform LNG liquefaction system based on LNG tank container storage and transportation

Abstract

The utility model relates to a sea-based platform LNG (Liquefied Natural Gas) liquefying system based on LNG tank container storage and transportation, which is characterized in that a floating bridge pipeline transportation system gathers and transports gas wells on land by using pipelines and transports natural gas to the sea-based LNG liquefying system by using a floating bridge system; the sea-based LNG liquefaction system is a ship or a maritime work platform which is used for pressurizing, purifying, refrigerating and liquefying natural gas of a land gas field through the floating bridge pipeline transportation system, and the LNG tank container is hoisted to an LNG filling station of the sea-based LNG liquefaction system or hoisted back to the sea-based LNG storage system or the LNG tank container transport ship through the lightering hoisting system and finally transported to a terminal user to be unloaded and then returned to the air. An LNG liquefaction factory, a container yard and a wharf do not need to be built on the land, and the system has the advantages of being short in construction period, high in flexibility, low in cost and economical in operation, and is suitable for LNG liquefaction storage and transportation of small natural gas fields with the yield of 10-500 thousand tons every year or boundary gas fields with large development and matching difficulty.

Description

Technical Field

[0001] This utility model relates to the field of LNG liquefaction storage and transportation technology, and in particular to an LNG liquefaction system for a marine platform based on LNG tank container storage and transportation. Background Technology

[0002] Currently, natural gas is mainly transported by sea in liquid form over long distances, with common storage methods including onshore LNG tank storage and floating LNG storage facilities. Typically, due to the relatively long distances between natural gas production sites and users, the liquefied natural gas is transported to the user's terminal via LNG carriers. The LNG is then unloaded into the terminal storage facilities via the carrier's loading and unloading platforms. Because LNG carriers have large transport volumes, with mainstream ocean-going LNG carriers ranging from 100,000 to 274,000 cubic meters, the required scale of supporting facilities such as wharves and onshore LNG storage tanks is no less than 200,000 to 300,000 cubic meters.

[0003] For example, for small natural gas fields with an annual output of 100,000 to 500,000 tons, building an LNG liquefaction plant and constructing 200,000 to 300,000 cubic meter onshore LNG storage tanks for transport by LNG carriers is not economically viable. The conventional approach is to use standardized LNG tank containers for multimodal transport via sea, road, and rail, with 40-foot T75 containers currently being the most common in the market. LNG tank container multimodal transport generally has strict requirements for resources such as terminals and LNG tank container yards. Terminals need good hydrological conditions to accommodate ocean-going vessels, and LNG tank container yards with a capacity of at least 500 containers are also required. Small natural gas fields are generally located in remote areas with poor surrounding public infrastructure. Establishing dedicated LNG tank container yards and terminals for LNG liquefaction plants is also difficult due to high costs.

[0004] As my country's economy grows, its reliance on natural gas imports has increased significantly, exceeding 50%. The impact of LNG imports via sea freight on energy security is becoming increasingly severe. Southeast Asia, located near the equator, is rich in natural gas resources. Taking Indonesia as an example, it comprises approximately 17,508 islands, many of which have scattered, small-scale natural gas fields. There are over a thousand small natural gas fields with annual reserves ranging from 100,000 to 500,000 tons, but these fields are scattered across the islands, making it impossible to collect and liquefy them into LNG via pipelines. Utility Model Content

[0005] The purpose of this invention is to provide an LNG liquefaction system for a sea-based platform based on LNG tank container storage and transportation, addressing the deficiencies in existing technologies.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An LNG liquefaction system based on LNG tank container storage and transportation on a marine platform includes an onshore natural gas field system, a floating bridge pipeline system, a marine LNG liquefaction system, a control system, a marine LNG storage system, and an LNG tank container transshipment system.

[0008] The floating bridge pipeline system includes a natural gas pipeline corridor system, a pipeline corridor floating bridge system, a floating bridge gathering and transportation pipeline, and a flexible gathering and transportation pipeline. The natural gas pipeline corridor system forms a floating platform through the pipeline corridor floating bridge system, and the flexible gathering and transportation pipeline connects the coastal end of the shore-based natural gas field system with the input end of the sea-based LNG liquefaction system.

[0009] The marine LNG liquefaction system integrates a natural gas power generation system, a natural gas purification and treatment system, an LNG cold box liquefaction system, a refrigerant compression and refrigeration system, and an LNG buffer charging and transfer system. The natural gas power generation system provides self-sufficient power to the marine platform, and the refrigerant compression and refrigeration system adopts a mixed refrigerant cycle process.

[0010] The marine LNG storage system includes LNG tank containers, an LNG tank container stacking and containment system, a shipborne hoisting and transshipment system, a first mooring system, and a first ship operation and navigation system.

[0011] The LNG tank container transshipment system includes a second ship operation and navigation system, an LNG tank container transportation and maintenance system, and a second mooring system. The LNG tank container transshipment system is connected to the sea-based LNG storage system through the second mooring system. The second ship operation and navigation system is used to schedule the transportation of the LNG tank containers.

[0012] The control system connects the various subsystems via wireless data communication to realize flow distribution, LNG filling scheduling, and transport ship scheduling.

[0013] Furthermore, in the aforementioned sea-based LNG liquefaction system:

[0014] The natural gas power generation system and the natural gas purification system are connected to the outlet of the floating bridge pipeline system, and the natural gas power generation system performs voltage transformation through the natural gas safety control system;

[0015] The outlet of the natural gas purification system is connected to the LNG cold box liquefaction system, and the heat exchange end of the LNG cold box liquefaction system is connected to the refrigerant compression refrigeration system.

[0016] Furthermore, the refrigerant compression refrigeration system includes a multi-stage compressor unit and a refrigerant mixing and proportioning device. The heat exchanger of the LNG cold box liquefaction system is connected to the natural gas condensation channel through a refrigerant circulation. The liquefied LNG is filled into the LNG tank through the buffer tank of the LNG buffer charging and transfer system.

[0017] Furthermore, the LNG tank container stacking enclosure system of the marine LNG storage system is equipped with a guide rail positioning mechanism, and the guide rail spacing is matched with the ISO container standard.

[0018] The LNG tank container integrates a smart IoT system, including pressure sensors, temperature sensors, liquid level sensors, leak detectors, and a LORA communication module. The LNG tank container achieves wireless data interaction with the control system through the LORA relay communication system, and its logistics information is remotely monitored through a smart cloud platform.

[0019] The shipborne lifting and transshipment system and the first mooring system are equipped with container-specific spreaders, and the first ship operation and driving system is used for displacement control of the storage platform.

[0020] Furthermore, the second ship operation and navigation system and the second mooring system are used for positioning the transport ship. The LNG tank container transport and maintenance system is equipped with a tank container fixing device and environmental monitoring equipment. The fully loaded LNG tank container is loaded into the LNG tank container transport and maintenance system through the ship-mounted hoisting and transshipment system.

[0021] Furthermore, the control system executes the following logic:

[0022] Based on the flow data of the natural gas gathering and transmission pipeline, the intake ratio of the natural gas power generation system and the natural gas purification and treatment system is dynamically allocated;

[0023] Based on the liquid level data of the LNG buffer charging and transfer system, the shipborne hoisting and transfer system is triggered to transfer the LNG tank container to the LNG tank container storage containment system.

[0024] Furthermore, the natural gas safety control system includes a multi-stage voltage conversion device and redundant power supply circuits, the outputs of which are respectively connected to the power distribution network of the natural gas power generation system and the power system of the third ship operation and navigation system;

[0025] The third ship operation and navigation system and the anchoring system are used for system positioning and maritime displacement control. The first ship operation and navigation system, the second ship operation and navigation system and the third ship operation and navigation system work together to control the berthing, mooring and separation operations of the sea-based platform and the transport ship.

[0026] Furthermore, the LNG tank container storage enclosure system is equipped with a gas detection system, an infrared sensor range detection system, and a LORA relay communication system. It is connected to the smart cloud platform through the LORA relay communication system to monitor the tank container pressure, temperature, and liquid level in real time.

[0027] Furthermore, the marine LNG liquefaction system and the marine LNG storage system are rigidly connected through the anchoring system and the first mooring system.

[0028] The beneficial effects of this utility model are as follows:

[0029] The solution of this invention eliminates the need to construct large LNG storage tanks and deep-water terminals, significantly reducing the investment scale of LNG liquefaction storage and transportation, simplifying LNG logistics, increasing project construction flexibility, and improving project construction efficiency.

[0030] The present invention uses LNG tank containers as the smallest module of the storage and transportation unit, which significantly reduces the number of LNG loading, unloading and transfer operations, avoids a large amount of cold energy waste and BOG release, and improves the safety of LNG storage and transportation.

[0031] The present invention adopts a sea-based platform skid-mounted system that integrates functional modules such as natural gas power generation, LNG liquefaction system, and LNG tank container storage and transportation, which greatly reduces the amount of on-site construction. It is highly applicable to the development of small natural gas fields with an annual capacity of 100,000 to 500,000 tons, and can rapidly develop this type of marginal gas field on a large scale. This is a major benefit to my country's energy security and can bring significant economic benefits. Attached Figure Description

[0032] 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 recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a framework diagram of the LNG liquefaction system for a sea-based platform based on LNG tank container storage and transportation in this utility model;

[0034] Figure 2 This is a schematic diagram of the LNG liquefaction system for a sea-based platform based on LNG tank container storage and transportation in this utility model.

[0035] Figure reference numerals: 1. Onshore natural gas field system; 101. Onshore natural gas field; 102. Natural gas manifold; 103. Natural gas gathering and transmission pipeline; 2. Floating bridge pipeline system; 201. Natural gas pipeline corridor system; 202. Pipeline corridor floating bridge system; 203. Floating bridge gathering and transmission pipeline; 204. Flexible gathering and transmission pipeline; 3. Offshore LNG liquefaction system; 301. Natural gas power generation system; 302. Natural gas purification and treatment system; 303. LNG buffer charging and transfer system; 304. LNG liquefaction cold box system; 305. Refrigerant compression system 306. Cooling system; 307. Natural gas safety control system; 308. Third ship operation and navigation system; 309. Control system; 300. Mooring system; 4. Offshore LNG storage system; 401. LNG tank container; 402. First ship operation and navigation system; 403. LNG tank container stacking and containment system; 404. Shipborne lifting and transshipment system; 405. First mooring system; 5. LNG tank container transshipment and transportation system; 501. Second ship operation and navigation system; 502. LNG tank container transportation and maintenance system; 503. Second mooring system. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] This invention provides a marine platform LNG liquefaction system based on LNG tank container storage and transportation. This system eliminates the need to build LNG liquefaction plants, container yards, and wharves on land. It has advantages such as short construction period, high flexibility, simplicity and reliability, low cost, compact structure, and good operating economy. It is particularly suitable for LNG liquefaction storage and transportation in small natural gas fields with an annual output of 100,000 to 500,000 tons, or for boundary gas fields with greater development and supporting facilities.

[0040] like Figure 1 and Figure 2 As shown, it includes an onshore natural gas field system 1, a floating bridge pipeline system 2, an offshore LNG liquefaction system 3, a control system 308, an offshore LNG storage system 4, and an LNG tank container transshipment system 5.

[0041] The floating bridge pipeline system 2 includes a natural gas pipeline corridor system 201, a pipeline corridor floating bridge system 202, a floating bridge gathering and transportation pipeline 203, and a flexible gathering and transportation pipeline 204. The natural gas pipeline corridor system 201 forms a floating platform through the pipeline corridor floating bridge system 202, and the flexible gathering and transportation pipeline 204 connects the coastal end of the shore-based natural gas field system 1 with the input end of the sea-based LNG liquefaction system 3.

[0042] The LNG liquefaction system 3 integrates a natural gas power generation system 301, a natural gas purification and treatment system 302, an LNG cold box liquefaction system, a refrigerant compression and refrigeration system 305, and an LNG buffer charging and transfer system 303. The natural gas power generation system 301 provides self-sufficient power to the LNG platform, and the refrigerant compression and refrigeration system 305 adopts a mixed refrigerant cycle process.

[0043] The marine LNG storage system 4 includes an LNG tank container 401, an LNG tank container stacking and containment system 403, a shipborne hoisting and transshipment system 404, a first mooring system 405, and a first ship operation and navigation system 402.

[0044] The LNG tank container transshipment system 5 includes a second ship operation and navigation system 501, an LNG tank container transportation and maintenance system 502, and a second mooring system 503. The LNG tank container transshipment system 5 is connected to the marine LNG storage system 4 through the second mooring system 503. The second ship operation and navigation system 501 is used to schedule the transportation of LNG tank containers 401.

[0045] The control system 308 connects various subsystems via wireless data communication to realize flow distribution, LNG filling scheduling and transport ship scheduling.

[0046] The LNG liquefaction and storage system described in this invention adopts a skid-mounted, self-sustaining power generation system on a sea-based platform. It integrates natural gas power generation, feed gas purification, refrigerant compression, LNG cold box liquefaction, LNG tank container filling, LNG tank container sea-based storage yard, LNG tank container hoisting and transshipment, LNG tank container ship transportation, and wireless data intelligent platform control. This significantly reduces the investment scale for LNG liquefaction and storage, simplifies LNG logistics, increases project construction flexibility, and improves project construction efficiency. The LNG tank container 401, as the smallest module of the storage and transportation unit, significantly reduces the number of LNG loading, unloading, and transfer operations, avoids significant waste of cold energy and BOG (Boiled Air Glow) release, and improves the safety of LNG storage and transportation.

[0047] Specifically, natural gas from the gas field flows into the pipeline system from the wellhead. After dust removal and oil-water separation, it is pressurized and transported to the land shore. From there, it enters the offshore LNG liquefaction system 3 via the floating bridge pipeline system 2. Part of the natural gas enters the natural gas power generation system 301 to provide self-sustaining power to the entire base system. The remaining natural gas undergoes purification treatment such as dehydration, desulfurization, and deacidification after heavy hydrocarbon separation before entering the LNG cold box liquefaction system. Simultaneously, the refrigerant is mixed in the system and then enters the refrigerant compressor for compression and refrigeration. The purified natural gas and refrigerant exchange heat in the LNG cold box. The refrigerant returns to the refrigerant compression system to complete the refrigeration cycle. The natural gas condenses to form LNG, which enters the LNG buffer tank and is then filled into the LNG tank container 401 via the LNG filling system. After the LNG tank container is full, it is loaded into the LNG tank container storage containment system 403 via the LNG tank container hoisting and transfer system. After the LNG tank container carrier berths at the LNG tank container sea-based storage yard, the LNG tank container hoisting and transfer system loads the fully loaded LNG tank containers into the LNG tank container transportation and maintenance system 502, and loads the empty LNG tank containers back into the LNG tank container storage and containment system 403. The LNG tank container carrier then transports the LNG tank containers to the end user for unloading and use, completing the LNG liquefaction storage and transportation process.

[0048] In the marine LNG liquefaction system 3 disclosed in this embodiment:

[0049] The natural gas power generation system 301 and the natural gas purification and treatment system 302 are connected to the outlet of the floating bridge pipeline system 2. The natural gas power generation system 301 performs voltage transformation through the natural gas safety control system 306. The outlet of the natural gas purification and treatment system 302 is connected to the LNG cold box liquefaction system. The heat exchange end of the LNG cold box liquefaction system is connected to the refrigerant compression refrigeration system 305.

[0050] Furthermore, the refrigerant compression refrigeration system 305 includes a multi-stage compressor unit and a refrigerant mixing and proportioning device. The heat exchanger of the LNG cold box liquefaction system is connected to the natural gas condensation channel through the refrigerant circulation. The liquefied LNG is filled into the LNG tank container 401 through the buffer tank of the LNG buffer charging and transfer system 303.

[0051] Furthermore, the natural gas safety control system 306 includes a multi-stage voltage conversion device and redundant power supply circuits. Its output terminals are respectively connected to the power distribution network of the natural gas power generation system 301 and the power system of the third ship operation and navigation system 307. The third ship operation and navigation system 307 and the mooring system 309 are used for system positioning and marine displacement control. The first ship operation and navigation system, the second ship operation and navigation system 501, and the third ship operation and navigation system 307 work together to control the berthing, mooring, and separation operations of the sea-based platform and the transport ship.

[0052] The marine LNG liquefaction system 3 and the marine LNG storage system 4 are rigidly connected by the mooring system 309 and the first mooring system 405.

[0053] Specifically, the offshore LNG liquefaction system 3 integrates self-sustaining power generation and supply, including natural gas power generation, feed gas purification, refrigerant compression, LNG cold box liquefaction, and LNG tank filling modules. Natural gas from the gas field flows into the pipeline system from the wellhead. After dust removal and oil-water separation, it is pressurized and transported to the land shore. It then enters the offshore LNG liquefaction system 3 via the floating bridge pipeline system 2. Part of the natural gas enters the natural gas power generation system 301 to provide self-sustaining power to the entire base system. The remaining natural gas undergoes purification treatment, including dehydration, desulfurization, and deacidification, after heavy hydrocarbon separation, before entering the LNG cold box liquefaction system. Simultaneously, the refrigerant is mixed in the system and then compressed in the refrigerant compressor. The purified natural gas and refrigerant exchange heat in the LNG cold box. The refrigerant returns to the refrigerant compression system to complete the refrigeration cycle. The natural gas condenses to form LNG, which enters the LNG buffer tank and is then filled into the LNG tank 401 via the LNG filling system.

[0054] In the marine LNG storage system 4 disclosed in this embodiment:

[0055] The LNG tank container stacking enclosure system 403 of the Haiji LNG storage system 4 is equipped with a guide rail positioning mechanism, and the guide rail spacing matches the ISO container standard. The LNG tank container integrates a smart IoT system, including pressure sensors, temperature sensors, liquid level sensors, leak detectors and LORA communication modules. The LNG tank container 401 achieves wireless data interaction with the control system 308 through the LORA relay communication system, and its logistics information is remotely monitored through the smart cloud platform.

[0056] Among them, LNG tank container 401 is equipped with a smart IoT system, which connects to the smart cloud platform through cellular networks, LoRa communication and other communication repeaters to monitor the pressure, temperature and liquid level of the LNG tank container, detect data such as leakage and collision of the LNG tank container, and use the LNG tank container as a unitized storage module to manage the logistics information of the LNG liquefaction storage and transportation process in a data-driven manner.

[0057] The shipborne lifting and transshipment system 404 and the first mooring system 405 are equipped with container-specific spreaders, and the first ship operation and navigation system 402 is used for displacement control of the storage platform. Furthermore, the second ship operation and navigation system 501 and the second mooring system 503 are used for positioning the transport ship, and the LNG tank container transport and maintenance system 502 is equipped with tank container securing devices and environmental monitoring equipment. Fully loaded LNG tank containers are loaded into the LNG tank container transport and maintenance system 502 via the shipborne lifting and transshipment system 404.

[0058] The LNG tank container storage containment system 403 is equipped with a gas detection system, an infrared sensor range detection system, and a LORA relay communication system. It connects to the smart cloud platform through the LORA relay communication system to monitor the tank container pressure, temperature, and liquid level in real time.

[0059] Specifically, the marine LNG storage system 4 is equipped with an LNG tank container stacking containment system 403, which uses guide rails to fix the LNG tank containers, enabling rapid stacking and lifting of LNG tank containers without lashing. The LNG tank container lifting and transshipment uses the ship-based lifting system equipped with the marine LNG storage system 4, which uses container spreaders to quickly lift the LNG tank containers. The LNG tank container stacking containment system 403 is equipped with a gas detection system, an infrared sensor range detection system, and a LORA relay communication system, which enables real-time wireless monitoring of the LNG tank containers.

[0060] The control system 308 disclosed in this embodiment executes the following logic:

[0061] Based on the flow data of the natural gas gathering and transmission pipeline 103, the gas intake ratio of the natural gas power generation system 301 and the natural gas purification and treatment system 302 is dynamically allocated; according to the liquid level data of the LNG buffer charging and transfer system 303, the ship-mounted hoisting and transfer system 404 is triggered to transfer the LNG tank container to the LNG tank container stacking and containment system 403.

[0062] Specifically, the LNG tank container transshipment system 5 forms a transshipment platform by anchoring and mooring the marine LNG liquefaction system 3 and the marine LNG storage system 4. The LNG tank container transport vessel is fixed to the side of the marine LNG storage system 4 by the mooring system. The fully loaded LNG tank containers are loaded into the LNG tank container transport and maintenance system 502 using the ship-based lifting system equipped with the marine LNG storage system 4. The empty LNG tank containers are loaded back into the LNG tank container stacking and containment system 403. The LNG tank container transport vessel then transports the LNG tank containers to the end user for unloading and use, completing the LNG liquefaction and storage process.

[0063] Based on the natural gas flow rate, the control system 308 automatically allocates the flow ratio into the self-sustaining power generation and raw gas purification system, and controls the automated operation of the LNG liquefaction system; combined with the LNG production, it fills the LNG tanks in the offshore LNG storage system 4, and schedules the operation of LNG tank transport ships according to the real-time storage status.

[0064] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A marine platform LNG liquefaction system based on LNG tank container storage and transportation, characterized in that, It includes an onshore natural gas field system (1), a floating bridge pipeline system (2), an offshore LNG liquefaction system (3), a control system (308), an offshore LNG storage system (4), and an LNG tank container transshipment system (5); The floating bridge pipeline system (2) includes a natural gas pipeline corridor system (201), a pipeline corridor floating bridge system (202), a floating bridge gathering and transportation pipeline (203), and a flexible gathering and transportation pipeline (204). The natural gas pipeline corridor system (201) forms a floating platform through the pipeline corridor floating bridge system (202). The flexible gathering and transportation pipeline (204) connects the coastal end of the shore-based natural gas field system (1) with the input end of the sea-based LNG liquefaction system (3). The marine LNG liquefaction system (3) integrates a natural gas power generation system (301), a natural gas purification and treatment system (302), an LNG cold box liquefaction system, a refrigerant compression and refrigeration system (305), and an LNG buffer charging and transfer system (303). The natural gas power generation system (301) provides self-sufficient power to the marine platform, and the refrigerant compression and refrigeration system (305) adopts a mixed refrigerant cycle process. The sea-based LNG storage system (4) includes an LNG tank container (401), an LNG tank container stacking containment system (403), a shipborne hoisting and transshipment system (404), a first mooring system (405), and a first ship operation and navigation system (402); The LNG tank container transshipment system (5) includes a second ship operation and driving system (501), an LNG tank container transportation and maintenance system (502), and a second mooring system (503). The LNG tank container transshipment system (5) is connected to the sea-based LNG storage system (4) through the second mooring system (503). The second ship operation and driving system (501) is used to schedule the transportation of the LNG tank container (401). The control system (308) connects each subsystem through wireless data communication to realize flow distribution, LNG filling scheduling and transport ship scheduling.

2. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 1, characterized in that, In the aforementioned marine LNG liquefaction system (3): The natural gas power generation system (301) and the natural gas purification system (302) are connected to the outlet of the floating bridge pipeline system (2), and the natural gas power generation system (301) performs voltage transformation through the natural gas safety control system (306); The outlet of the natural gas purification system (302) is connected to the LNG cold box liquefaction system, and the heat exchange end of the LNG cold box liquefaction system is connected to the refrigerant compression refrigeration system (305).

3. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 2, characterized in that, The refrigerant compression refrigeration system (305) includes a multi-stage compressor unit and a refrigerant mixing and proportioning device. The heat exchanger of the LNG cold box liquefaction system is connected to the natural gas condensation channel through the refrigerant circulation. The liquefied LNG is filled into the LNG tank (401) through the buffer tank of the LNG buffer charging and transfer system (303).

4. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 1, characterized in that, The LNG tank container stacking enclosure system (403) of the marine LNG storage system (4) is equipped with a guide rail positioning mechanism, and the guide rail spacing is matched with the ISO container standard. The LNG tank container (401) integrates a smart IoT system, including a pressure sensor, a temperature sensor, a liquid level sensor, a leak detector, and a LORA communication module. The LNG tank container (401) achieves wireless data interaction with the control system (308) through the LORA relay communication system, and its logistics information is remotely monitored through the smart cloud platform. The shipborne lifting and transshipment system (404) and the first mooring system (405) are equipped with container-specific spreaders, and the first ship operation and driving system (402) is used for displacement control of the storage platform.

5. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 1, characterized in that, The second ship operation and driving system (501) and the second mooring system (503) are used for positioning the transport ship. The LNG tank container transport and maintenance system (502) is equipped with a tank container fixing device and environmental monitoring equipment. The fully loaded LNG tank container (401) is loaded into the LNG tank container transport and maintenance system (502) through the ship-mounted hoisting and transshipment system (404).

6. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 1, characterized in that, The control system (308) executes the following logic: Based on the flow data of the natural gas gathering and transmission pipeline (103), the gas intake ratio of the natural gas power generation system (301) and the natural gas purification and treatment system (302) is dynamically allocated; Based on the liquid level data of the LNG buffer charging and transfer system (303), the shipborne hoisting and transfer system (404) is triggered to transfer the LNG tank container (401) to the LNG tank container stacking containment system (403).

7. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 2, characterized in that, The natural gas safety control system (306) includes a multi-stage voltage conversion device and redundant power supply circuits, and its output terminals are respectively connected to the power distribution network of the natural gas power generation system (301) and the power system of the third ship operation and driving system (307); The third ship operation and driving system (307) and the anchoring system (309) are used for system positioning and sea displacement control. The first ship operation and driving system, the second ship operation and driving system (501) and the third ship operation and driving system (307) work together to control the berthing, mooring and separation operations of the sea-based platform and the transport ship.

8. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 4, characterized in that, The LNG tank container storage enclosure system (403) is equipped with a gas detection system, an infrared sensor range detection system, and a LORA relay communication system. It is connected to the smart cloud platform through the LORA relay communication system to monitor the tank container pressure, temperature, and liquid level in real time.

9. The LNG liquefaction system for offshore platforms based on LNG tank container storage and transportation according to claim 7, characterized in that, The marine LNG liquefaction system (3) and the marine LNG storage system (4) are rigidly connected through the mooring system (309) and the first mooring system (405).

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