LNG gasification cold storage medium transport ship and operation method thereof

Abstract

The present invention relates to the field of shipbuilding and marine engineering technology, and more particularly to an LNG gasification cold storage medium transport vessel and an operating method thereof. The LNG gasification cold storage medium transport vessel includes multiple cold energy storage and transportation systems installed on the vessel's hull. The cold energy storage and transportation systems include several cold storage medium tanks, a medium concentration detection and adjustment module, and a cold storage medium exchange station. The several cold storage medium tanks are connected by a piping system. When the vessel arrives at an LNG port, FSRU, or dock, the cold storage medium exchange station is connected to an external device. The medium concentration detection and adjustment module receives a cold storage temperature instruction, and then performs cold storage medium concentration detection and adjustment, as well as cold storage medium tank transfer operations. This allows the cold storage medium to complete heat exchange with the external device through the cold storage medium exchange station to implement cold storage or cold release operations. The present invention achieves efficient utilization of cold energy during LNG gasification operations.

Description

Technical Field

[0001] The present invention relates to the technical field of ships and marine engineering, and in particular to an LNG gasification cold storage medium transport ship and an operation method thereof. Background Art

[0002] LNG carriers, known as "super refrigerated trucks at sea," contain considerable cold energy resources. The process of unloading and converting the gas into natural gas at LNG receiving stations generates a large amount of cold energy. Consequently, supporting cold energy utilization units are often built near the receiving stations. For safety reasons, LNG receiving stations are located in remote areas, far from most cold energy users, such as power plants, residential areas, computer centers, biopharmaceutical factories, and offshore cold-water aquaculture bases. This limits the scope of cold energy utilization and hinders its widespread, multi-party coordinated application. Furthermore, the LNG gasification operation time often does not match the time of cold energy demand, hindering the flexibility of cold energy utilization. Furthermore, the LNG gasification operation area and cold energy utilization area of ​​traditional LNG receiving stations are planned separately, with long distances between the areas and low cold energy utilization efficiency. This results in ineffective cold energy utilization and a lack of cold storage measures. On the other hand, the carriers with low freezing temperatures (-60°C to -40°C) and refrigeration temperatures (-40°C and -20°C) generated by the LNG gasification process are widely needed in the food processing and biopharmaceutical fields. This temperature range is also compatible with the cooling needs of other industries, power generation and aquaculture, so it has a wide range of uses. However, there are currently no such large-scale cold storage medium transportation tools and methods. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides an LNG gasification cold storage medium transport vessel and an operating method thereof, which solves the problem of low cold energy utilization during existing LNG gasification operations. By providing an LNG gasification cold storage medium transport vessel, efficient cold energy utilization during LNG gasification operations is achieved, saving energy consumption and improving resource utilization.

[0004] The present invention provides an LNG gasification cold storage medium transport ship, comprising a plurality of cold energy storage and transportation systems arranged on the hull, wherein the cold energy storage and transportation systems include a plurality of cold storage medium tanks, a medium concentration detection and adjustment module, and a cold storage medium exchange station. The plurality of cold storage medium tanks are connected by a pipe system, and the cold storage medium tanks store cold storage medium.

[0005] When the ship arrives at the LNG port, FSRU or terminal, the cold storage medium exchange station is connected to the external equipment, and the medium concentration detection and adjustment module receives the cold storage temperature instruction, and then the medium concentration detection and adjustment module performs cold storage medium concentration detection, cold storage medium concentration adjustment and cold storage medium position adjustment operations, so that the cold storage medium completes heat exchange with the external equipment through the cold storage medium exchange station to implement cold storage operation or cold release operation.

[0006] A further improvement of the LNG gasification cold storage medium transport ship of the present invention is that the cold storage medium includes a first cold storage medium and a second cold storage medium, the temperature range of the first cold storage medium is -60℃~-40℃, and the temperature range of the second cold storage medium is -40℃~-20℃.

[0007] A further improvement of the LNG gasification cold storage medium transport ship of the present invention is that the cold storage medium tank storing the first cold storage medium is located in the middle of the cold storage medium tank storing the second cold storage medium, and several of the cold storage medium tanks are located in the cargo hold area of ​​the hull.

[0008] A further improvement of the LNG gasification cold storage medium transport ship of the present invention is that the cold storage medium is a non-phase-changing liquid solution, the first cold storage medium and the second cold storage medium have the same structure and properties, the first cold storage medium and the second cold storage medium have different concentrations, and the concentration of the first cold storage medium is less than the concentration of the second cold storage medium.

[0009] A further improvement of the LNG gasification cold storage medium transport ship of the present invention is that the cold storage medium tank is a double-layer vacuum insulation tank with a square closed structure, and the cold storage medium tank includes a vacuum insulation inner tank, a first vacuum interlayer tank and a second vacuum insulation interlayer tank. The bulkhead of the vacuum insulation inner tank is made of stainless steel, and an insulating pad is provided between the first vacuum interlayer tank and the second vacuum insulation interlayer tank.

[0010] A further improvement of the LNG gasification cold storage medium transport ship of the present invention is that the first vacuum interlayer cabin and the second vacuum insulation interlayer cabin are both arranged with a number of vacuum suction riser assemblies, and the vacuum suction riser assemblies include a number of first porous risers evenly arranged in the first vacuum interlayer cabin and a number of second porous risers evenly arranged in the second vacuum insulation interlayer cabin, the first porous riser is connected to a first vacuum check valve and a first vacuum suction nozzle, and the second porous riser is connected to a second vacuum check valve and a second vacuum suction nozzle.

[0011] A further improvement of the LNG gasification cold storage medium transport ship of the present invention is that a replacement buffer tank is provided at the bow of the hull, the replacement buffer tank is connected to a submersible pump, the replacement buffer tank is connected to the cold storage medium tank, and the submersible pump is used to allocate cold storage medium. The hull posture is adjusted by allocating cold storage medium between the replacement buffer tank and the cold storage medium tank to replace the ballast system and the ballast tank.

[0012] A further improvement of the LNG gasification cold storage medium transport ship of the present invention is that the medium concentration detection and adjustment module includes a medium concentration detection regulator and a medium filling system, the medium concentration detection regulator includes a cold storage medium concentration sampling tester, the medium filling system includes a medium tank and filling equipment, and the medium concentration detection regulator is connected to the medium filling system.

[0013] A further improvement of the LNG gasified cold storage medium transport ship of the present invention is that a deep well cold storage pump is arranged on the top of the cold storage medium tank, and the suction port of the deep well cold storage pump is located at the upper middle liquid level of the cold storage medium in the cold storage medium tank. The deep well cold storage pump is used to perform cold storage operations, and the cold storage medium in the cold storage medium tank is extracted through the suction port of the deep well cold storage pump, and then transferred to the LNG heat exchanger for heat exchange, and then flows back to the bottom of the cold storage medium tank through the lower cold storage return pipe of the deep well cold storage pump, thereby completing the cold storage operation;

[0014] A submersible cold release pump is arranged at the inner bottom of the cold storage medium cabin. At the dock, the submersible cold release pump is used to transport the cold storage medium and deliver it to the user's heat exchanger for cold release. After cold release, the cold storage medium flows back into the cold storage medium cabin through the cold release return pipe located at the upper part of the cold storage medium cabin, completing the cold release operation.

[0015] The present invention also provides an operating method for an LNG gasification cold storage medium transport ship, which is implemented using the above-mentioned LNG gasification cold storage medium transport ship, and includes the following steps:

[0016] S1, completes cold storage operation at LNG port or FSRU;

[0017] S11, before the cold storage operation, a cold storage plan is formulated according to the required cold storage capacity. The cold storage plan includes formulating the temperature of the cold storage medium and the cold storage volume, and then detecting and adjusting the cold storage medium concentration in the cold storage medium tank to match the corresponding cold storage medium temperature, or adjusting the cold storage medium tank according to the cold storage volume;

[0018] S12, when the ship berths at the LNG port or FSRU, the cold storage medium exchange station is connected to the heat exchanger medium pipe of the LNG or FSRU;

[0019] S13, the cold storage medium in the cold storage medium compartment undergoes heat exchange with the heat exchanger medium pipe through the cold storage medium exchange station, so that the cold storage medium performs cold storage operation according to the cold storage plan;

[0020] S14, the cold storage medium after the cold storage operation returns to the cold storage medium cabin;

[0021] S15, the medium concentration detection and adjustment module measures the temperature of the cold storage medium in the plurality of cold storage medium compartments, and determines whether the cold storage medium in each cold storage medium compartment has reached the cold storage capacity. When the cold storage capacity has been reached, the cold storage operation is completed and the cold storage medium compartment is sealed.

[0022] S16, adjusting the ship's navigation posture on the water by replacing the buffer compartment;

[0023] S2, the hull is moved to a cold unit for off-site cold release operation;

[0024] S21, after the ship arrives at the user's wharf, it is connected to the heat exchanger medium pipeline of the cold user through the cold storage medium exchange station, and the cold storage medium is pumped out from the cold storage medium tank to the heat exchanger medium pipeline using a submersible cold release pump;

[0025] After the cold storage medium releases its cold energy, the returned cold storage medium flows to the replacement buffer compartment for buffering. After the previous cold storage medium compartment is emptied and the cold storage medium compartment is emptied, it will serve as the next temporary buffer compartment. After all the cold storage media have released their cold energy, the cold storage medium in the replacement buffer compartment will be returned to the cold storage medium compartment that has completed the cold release operation last. Alternatively, when the replacement buffer compartment cannot be used, the returned cold storage medium will be returned to the corresponding cold storage medium compartment through the cold release return pipe on the upper part of the cold storage medium compartment to complete the cold release operation.

[0026] S22, by replacing the buffer tank, the ship's navigation posture on the water is adjusted, and the ship moves to the LNG port or FSRU cycle to implement the next cold storage operation.

[0027] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0028] The LNG gasification cold storage medium transport ship of the present application can safely store and transport the cold energy released during the LNG gasification operation. The cold storage is not subject to the passive spatial and passive time limitations of the LNG gasification operation. The cold energy can be stored and transported to a remote user terminal for release, thereby expanding the scope of LNG cold energy users and solving the spatial and temporal mismatch between LNG gasification and cold energy utilization.

[0029] The LNG gasification cold storage medium transport ship of the present application realizes the cycle operation of gasification-cold storage-cold storage-transportation-off-site cold energy release through the non-phase-changing cold storage medium, systematically solving the problem of coordination and unification of various functions;

[0030] The LNG gasification cold storage medium transport ship of the present application can fully utilize the hull space, rationally divide and layout the cold energy storage area, have a compact structure, reduce cold loss, and achieve the best cold storage and heat preservation effect of the ship's cold storage medium tank as a whole, achieving the best economy. The cold storage medium with a lower temperature (the temperature is the cold brittle temperature of the steel plate) is placed inside the core, which increases the distance from the outer wall of the cold storage medium tank storing the lower temperature cold storage medium to the ship's outboard side, reducing the risk of cold storage medium leakage caused by accidental collision and damage to the tank, avoiding brittle cracking of the hull steel plate, and ensuring the safety of the ship structure.

[0031] The cold storage medium tank of the present application adopts a square double-layer vacuum structure, which is simple to construct and suitable for heat preservation of large-capacity square tanks. It is particularly suitable for storage at low freezing temperatures, i.e., the critical cold brittle temperature of steel (-60°C to -40°C). The structure is cost-effective and has good heat preservation effect. The cold storage medium tank has a high degree of freedom in shape and fully fits the hull, which reduces the construction cost of the cold storage medium tank, improves the space utilization rate of the hull, and maximizes the tank capacity utilization rate.

[0032] The LNG gasification cold storage medium transport ship of the present application has no ballast system and ballast tank design, which reduces ship construction costs, increases cargo capacity, and reduces ship operation workload;

[0033] The LNG gasified cold storage medium carrier of this application can achieve separate compartment storage of different temperature qualities or different cold storage media, more conveniently providing different qualities of cold energy to users who need cold, and facilitating user selection. Cold storage media with low freezing temperatures (-60°C to -40°C) and freezing temperatures (-40°C and -20°C) are widely needed, especially in the food processing and biopharmaceutical fields. At the same time, this temperature range is compatible with the cooling needs of other industries, power generation, and aquaculture. Therefore, cold storage media with cold capacity have a wide range of uses. However, there is currently no such cold storage medium transportation equipment and method.

[0034] The cold storage medium transportation, cold storage operation, and cold release operation of the LNG gasification cold storage medium carrier in this application do not involve explosive gases and liquids. The equipment of the entire ship is selected and arranged according to the safety level of Z2 or above, achieving economy based on the safety of the entire operation chain;

[0035] The LNG gasification cold storage medium transport ship of the present application is provided with a replacement buffer tank at the bow. The replacement buffer tank serves as an empty buffer tank. After arriving at the port, it can receive the cold storage medium after the cold exchange and the cold storage medium after the cold storage. It can adapt to the double-cycle replacement operation, avoid the mixing of cold and hot media, improve the process efficiency, and is conducive to adjusting the longitudinal tilt attitude of the device, so that the device can sail in an energy-saving and efficient manner.

[0036] The cold storage medium concentration detection and adjustment module and cold storage medium filling system of the LNG gasification cold storage medium transport ship of the present application are used to detect the medium concentration and adjust the medium concentration to adapt to different storage temperatures according to different low-temperature storage requirements. It can prevent the cold storage medium from aging, ensure the medium's cold storage capacity remains unchanged, and adjust the cold storage medium concentration according to the cold storage plan to achieve the cold storage capacity required for transportation.

[0037] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a schematic diagram of the cold storage medium tank in the LNG gasification cold storage medium transport ship of this application. Figure 1 .

[0040] Figure 2 This is a schematic diagram of the cold storage medium tank in the LNG gasification cold storage medium transport ship of this application. Figure 2 .

[0041] Reference numerals:

[0042] 1. Vacuum-insulated inner cabin; 11. Cold storage return pipe; 12. Cold release return pipe; 2. First vacuum interlayer cabin; 3. Second vacuum-insulated interlayer cabin; 4. Submersible cold release pump; 5. Deep-well cold storage pump; 61. Second vacuum suction nozzle; 62. First vacuum suction nozzle; 63. Second multi-porous vertical pipe; 64. First multi-porous vertical pipe; 7. Hull; 81. Low-temperature freezing cold storage system; 82. Refrigerated cold storage system; 83. Replacement buffer cabin; 9. Cold storage medium exchange station; 10. Medium concentration detection and adjustment module. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0044] The following combination Figure 1 and Figure 2 The present application describes an LNG gasification cold storage medium transport ship, which includes multiple cold energy storage and transportation systems installed on a hull 7. The cold energy storage and transportation systems include several cold storage medium tanks, a medium concentration detection and adjustment module 10, and a cold storage medium exchange station 9. The several cold storage medium tanks are connected by a piping system, and the cold storage medium tanks store cold storage medium. The piping system and the medium concentration detection and adjustment module 10 are installed on the main deck of the hull 7, and the cold storage medium exchange station 9 is installed on the ship's side of the main deck.

[0045] When the hull 7 arrives at the LNG port, FSRU or terminal, the cold storage medium exchange station 9 is connected to the external equipment, and the medium concentration detection and adjustment module 10 receives the cold storage temperature instruction, and then the medium concentration detection and adjustment module 10 performs cold storage medium concentration detection, cold storage medium concentration adjustment and cold storage medium position adjustment operations, so that the cold storage medium completes heat exchange with the external equipment through the cold storage medium exchange station 9 to implement cold storage operation or cold release operation.

[0046] In a preferred embodiment of the LNG gasification cold storage medium transport ship of the present invention, the cold storage medium includes a first cold storage medium and a second cold storage medium. The temperature range of the first cold storage medium is -60℃~-40℃ (cold brittle temperature of steel plate), and the temperature range of the second cold storage medium is -40℃~-20℃. Cold storage media of different temperatures are stored in separate compartments, which can more conveniently provide cold energy carriers of different qualities for users who need cold. Cold storage media of different temperature ranges are compatible with a wide range of industrial and aquaculture cooling needs. The cold storage medium carrying method of this device is more convenient for users to choose according to their needs.

[0047] Specifically, the cold energy storage and transportation system storing the first cold storage medium serves as the low-temperature freezing cold storage system 81 , and the cold energy storage and transportation system storing the second cold storage medium serves as the freezing cold storage system 82 .

[0048] Specifically, the temperature of the first cold storage medium is critical to the freezing brittle fracture failure temperature of the hull 7 steel plate. If the cold storage medium leaks due to a tank breach, the hull 7 steel plate will brittle and cause harm. Therefore, the cold storage medium tanks storing cold storage media of the same type, concentration and quality are centrally arranged on the hull. The cold storage medium tank storing the first cold storage medium is located in the middle of the cold storage medium tank storing the second cold storage medium. Several cold storage medium tanks are located in the cargo hold area of ​​the hull 7. The cold storage medium tanks storing cold storage media of the same type, concentration and quality are arranged in the same area. This arrangement is more conducive to the comprehensive cooling efficiency of the cold storage medium during storage and transportation. At the same time, since the cold storage medium with a lower temperature is placed inside the core, the distance from the outer wall of the cold storage medium tank storing the cold storage medium with a lower temperature to the outer side of the ship is increased, thereby reducing the risk of cold storage medium leakage caused by accidental collision and tank breach, avoiding brittle fracture and damage of the hull 7 steel plate, and ensuring the safety of the ship structure.

[0049] Specifically, the cold storage medium is a liquid solution with non-phase change, high heat capacity, wide phase change temperature range and chemical stability. The first cold storage medium and the second cold storage medium have the same structure and properties, but different concentrations. The concentration of the first cold storage medium is less than that of the second cold storage medium. The different cold storage capacities of cold storage media with different concentrations are utilized to realize cold storage and storage and transportation of different temperature media in separate compartments, such as ethanol mixed liquid or ethylene glycol mixed liquid media, to exchange cold energy to meet the purpose of cold storage. In the cold storage operation and cold release operation, there is no gas phase change, which is easy to manage and can be recycled for a long time.

[0050] Preferably, the deck of the hull 7 adopts a flat design to facilitate the arrangement of equipment and operation on the deck. The cold storage medium exchange station 9 is arranged in parallel on the deck on the side of the ship. The medium output and input pipelines of the cold storage medium exchange station 9 can be connected to the pipeline network of external cold users to exchange the cold energy of the cold storage medium.

[0051] Furthermore, the cold storage medium cabin is a double-layer vacuum insulation cabin with a square closed structure, and the cold storage medium cabin includes a vacuum insulation inner cabin 1, a first vacuum interlayer cabin 2 and a second vacuum insulation interlayer cabin 3. The cabin wall of the vacuum insulation inner cabin 1 is made of stainless steel, and an insulation pad is arranged between the first vacuum interlayer cabin 2 and the second vacuum insulation interlayer cabin 3. The insulation pad is a wooden porous board, and the second vacuum insulation interlayer cabin 3 is made of insulating material.

[0052] Preferably, the square double-layer insulated vacuum structure of the cold storage medium tank is simple to construct and low in cost. It is suitable for the insulation effect of cold storage medium at -20°C to -60°C, and has a high cost-effectiveness. It is particularly suitable for the low freezing temperature set for storage, that is, the critical cold brittle temperature of steel, and is easy to hoist as a whole. The cold storage medium tank has a high degree of freedom in shape and can fully fit the hull 7. It is easy to arrange and construct within the hull 7, improves the utilization rate of the hull 7 space, and can effectively increase the tank capacity. The bottom of the cold storage medium tank uses a composite bottom plate, which improves the load-bearing capacity and stability, reduces the weight of the hull 7, and serves as a protective structure for the cold storage medium tank, preventing the cold storage medium tank leakage from damaging the hull 7 steel plate through low-temperature brittle cracking.

[0053] Furthermore, the first vacuum mezzanine cabin 2 and the second vacuum insulation mezzanine cabin 3 are both arranged with a number of vacuum suction riser assemblies, and the vacuum suction riser assemblies include a number of first porous risers 64 evenly arranged in the first vacuum mezzanine cabin 2 and a number of second porous risers 63 evenly arranged in the second vacuum insulation mezzanine cabin. The first porous riser 64 is connected to a first vacuum check valve and a first vacuum suction nozzle 62, and the second porous riser 63 is connected to a second vacuum check valve and a second vacuum suction nozzle 61.

[0054] Preferably, a sealed protective box is provided on the deck of the hull 7, wherein a first vacuum check valve, a second vacuum check valve, a first vacuum suction nozzle 62, and a second vacuum suction nozzle 61 are located inside the sealed protective box. A lid is hingedly connected to one side of the sealed protective box to provide a secondary seal for the vacuum level. The vacuum suction riser assembly is used to detect the vacuum level of the interlayer of the first vacuum interlayer cabin 2 and the second vacuum insulation interlayer cabin 3 and to extract the gas within the interlayer of the double-layer vacuum insulation cabin to achieve a certain vacuum level requirement. After vacuum extraction, the complex technology and high cost of large-space vacuum extraction are avoided. In addition, multiple sets of insulating wood pads and perforated plates play a supporting role, improving the structural stability of the cabin. Multiple cold storage medium cabins share a bulkhead plate, forming a joint cold insulation form between the cabins.

[0055] Furthermore, a replacement buffer tank 83 is provided at the bow of the hull 7, and the replacement buffer tank 83 is connected to a submersible pump. The replacement buffer tank 83 is connected to the cold storage medium tank. The submersible pump is used to allocate the cold storage medium. The posture of the hull 7 is adjusted by allocating the cold storage medium between the replacement buffer tank 83 and the cold storage medium tank to replace the ballast system and the ballast tank. The hull 7 does not require a ballast tank and a ballast water system, which simplifies the structure of the hull 7, significantly reduces the overall weight and construction cost of the hull 7, reduces the loading procedure of the hull 7, is conducive to adjusting the longitudinal tilt posture of the ship, increases the carrying speed of the ship, and effectively achieves energy-saving effects.

[0056] Furthermore, the medium concentration detection and adjustment module 10 includes a medium concentration detection and adjustment device and a medium filling system. The medium concentration detection and adjustment device includes a cold storage medium concentration sampling tester. The medium filling system includes a medium tank and a filling device. The medium concentration detection and adjustment device is connected to the medium filling system.

[0057] Preferably, the medium concentration detection and adjustment module 10 can adjust the medium concentration to accommodate cold storage media stored at different temperatures. Since the cold storage medium is a mixed solution that is circulated daily and volatile, a decrease in the cold storage medium concentration will directly affect the cold storage effect. If the cold storage medium concentration sampling tester detects a decrease in the cold storage medium concentration, pure cold storage medium will be added from the medium tank to the cold storage medium compartment via the filling device to adjust the cold storage medium concentration to the appropriate level. This facilitates the monitoring and adjustment of the cold storage quality of the cold storage medium at any time to meet the cold storage quality requirements, ensure the cold storage effect, maintain the cold storage quality of the cold storage medium unchanged, and prevent aging of the mixed liquid from affecting the cold energy storage effect.

[0058] Preferably, before each operation, the concentration of the cold storage medium can be adjusted to a suitable value according to the cold storage capacity plan, and the cold storage medium can be adjusted according to the cold storage capacity plan, and the cold storage temperature (cold capacity value) required to be stored can be selected accordingly to meet the requirements of the cold storage capacity plan.

[0059] Furthermore, a deep well cold storage pump 5 is arranged on the top of the cold storage medium tank. The suction port of the deep well cold storage pump 5 is located at the upper middle liquid level of the cold storage medium in the cold storage medium tank. The deep well cold storage pump 5 is used to perform cold storage operations. The cold storage medium in the cold storage medium tank is extracted through the suction port of the deep well cold storage pump 5 and then transferred to the LNG heat exchanger to heat the LNG, thereby reducing the temperature of the cold storage medium. The cold storage medium then flows back to the bottom of the cold storage medium tank through the lower cold storage return pipe 11 of the deep well cold storage pump 5, completing the cold storage operation.

[0060] A submersible cold release pump 4 is arranged at the bottom of the cold storage medium tank. At the dock, the submersible cold release pump 4 is used to transfer the cold storage medium to the user's heat exchanger for cold release. After cold release, the cold storage medium flows back into the cold storage medium tank through the cold release return pipe located at the upper part of the cold storage medium tank, completing the cold release operation.

[0061] The cold storage medium compartment is equipped with a dedicated deep well cold storage pump 5 and a submersible cold release pump 4, which is beneficial for distinguishing different cycles, reducing heat energy conduction, and improving the overall efficiency of cold storage.

[0062] The present application also provides an operation method of an LNG gasification cold storage medium transport ship, which uses the above LNG gasification cold storage medium transport ship to implement the operation method, including the following steps:

[0063] S1, completes cold storage operation at LNG port or FSRU;

[0064] S11, before the cold storage operation, a cold storage plan is formulated according to the required cold storage capacity. The cold storage plan includes formulating the temperature of the cold storage medium and the cold storage volume, and then detecting and adjusting the cold storage medium concentration in the cold storage medium tank to match the corresponding cold storage medium temperature, or adjusting the cold storage medium tank according to the cold storage volume;

[0065] S12, when the hull 7 docks at the LNG port or FSRU, the cold storage medium exchange station 9 is connected to the heat exchange medium pipe of the LNG or FSRU;

[0066] S13, the cold storage medium in the cold storage medium compartment undergoes heat exchange with the heat exchanger medium pipe through the cold storage medium exchange station 9, so that the cold storage medium performs cold storage operation according to the cold storage plan;

[0067] S14, the cold storage medium after the cold storage operation returns to the cold storage medium cabin;

[0068] S15, the medium concentration detection and adjustment module 10 measures the temperature of the cold storage medium in the plurality of cold storage medium compartments, and determines whether the cold storage medium in each cold storage medium compartment has reached the cold storage capacity. When the cold storage capacity has been reached, the cold storage operation is completed and the cold storage medium compartment is sealed.

[0069] S16, adjusting the navigation posture of the hull 7 on the water by replacing the buffer compartment 83;

[0070] S2, the hull 7 is moved to a cold unit for off-site cold release operation;

[0071] S21: After the ship 7 arrives at the user's dock, it is connected to the heat exchanger medium pipeline of the cold unit through the cold storage medium exchange station 9. The submersible cold release pump 4 is used to pump the cold storage medium out of the cold storage medium tank through the submersible cold release pump 4 to the heat exchanger medium pipeline.

[0072] After the cold storage medium releases its cold energy, the returned cold storage medium flows to the replacement buffer compartment 83 for buffering. After the previous cold storage medium compartment is emptied and the cold storage medium compartment is emptied, it will serve as the next temporary buffer compartment. After all the cold storage media have released their cold energy, the cold storage medium in the replacement buffer compartment 83 will be returned to the cold storage medium compartment that has last completed the cold release operation. Alternatively, when the replacement buffer compartment 83 cannot be used, the returned cold storage medium is returned to the corresponding cold storage medium compartment through the cold release return pipe 12 on the upper part of the cold storage medium compartment to complete the cold release operation.

[0073] S22, by replacing the buffer compartment 83, the navigation posture of the hull 7 on the water is adjusted, and the hull 7 moves to the LNG port or FSRU cycle to implement the next cold storage operation.

[0074] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0075] The LNG gasification cold storage medium transport ship of the present application can safely store and transport the cold energy released during the LNG gasification operation. The cold storage is not subject to the passive spatial and passive time limitations of the LNG gasification operation. The cold energy can be stored and transported to a remote user terminal for release, thereby expanding the scope of LNG cold energy users and solving the spatial and temporal mismatch between LNG gasification and cold energy utilization.

[0076] The LNG gasification cold storage medium transport ship of the present application realizes the cycle operation of gasification-cold storage-cold storage-transportation-off-site cold energy release through the non-phase-changing cold storage medium, systematically solving the problem of coordination and unification of various functions;

[0077] The LNG gasified cold storage medium transport ship of the present application can fully utilize the space of the hull 7, rationally divide and layout the cold energy storage area, have a compact structure, reduce cold loss, and achieve the best cold storage and heat preservation effect of the ship's cold storage medium tank as a whole, achieving the best economy. The cold storage medium with a lower temperature (the temperature is the cold brittle temperature of the steel plate) is placed inside the core, which increases the distance from the outer wall of the cold storage medium tank storing the lower temperature cold storage medium to the ship's outer side, reducing the risk of cold storage medium leakage caused by accidental collision and damage to the tank, avoiding brittle cracking of the hull 7 steel plate, and ensuring the safety of the ship structure.

[0078] The cold storage medium tank of the present application adopts a square double-layer vacuum structure, which is simple to construct and suitable for heat preservation of large-capacity square tanks. It is particularly suitable for storage at low freezing temperatures, i.e., the critical cold brittle temperature of steel (-60°C to -40°C). The structure has a high cost-effectiveness and good heat preservation effect. The cold storage medium tank has a high degree of freedom in shape and fully fits the hull 7, which reduces the construction cost of the cold storage medium tank, improves the space utilization of the hull 7, and maximizes the tank capacity utilization.

[0079] The LNG gasification cold storage medium transport ship of the present application has no ballast system and ballast tank design, which reduces ship construction costs, increases cargo capacity, and reduces ship operation workload;

[0080] The LNG gasified cold storage medium carrier of this application can achieve separate compartment storage of different temperature qualities or different cold storage media, more conveniently providing different qualities of cold energy to users who need cold, and facilitating user selection. Cold storage media with low freezing temperatures (-60°C to -40°C) and freezing temperatures (-40°C and -20°C) are widely needed, especially in the food processing and biopharmaceutical fields. At the same time, this temperature range is compatible with the cooling needs of other industries, power generation, and aquaculture. Therefore, cold storage media with cold capacity have a wide range of uses. However, there is currently no such cold storage medium transportation equipment and method.

[0081] The cold storage medium transportation, cold storage operation, and cold release operation of the LNG gasification cold storage medium transport ship in this application do not involve explosive gases and liquids. The safety level of the entire ship equipment is selected and arranged according to Z2 level or above, achieving economy based on the safety of the entire operation chain;

[0082] The LNG gasification cold storage medium transport ship of the present application is provided with a replacement buffer tank 83 at the bow. The replacement buffer tank 83 serves as an empty buffer tank. After arriving at the port, it can receive the cold storage medium after the cold exchange and the cold storage medium after the cold storage. It can adapt to the double-cycle replacement operation, avoid the mixing of cold and hot media, improve the process efficiency, and is conducive to adjusting the longitudinal tilt attitude of the device, so that the device can sail in an energy-saving and efficient manner.

[0083] The cold storage medium concentration detection and adjustment module 10 and the cold storage medium filling system of the LNG gasification cold storage medium transport ship of the present application are used to detect the medium concentration and adjust the medium concentration to adapt to different storage temperatures according to different low-temperature storage requirements. It can prevent the cold storage medium from aging, ensure the medium's cold storage capacity remains unchanged, and adjust the cold storage medium concentration according to the cold storage plan to achieve the cold storage capacity required for transportation.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An LNG gasification cold storage medium transport ship, characterized in that: The cold energy storage and transportation system comprises a plurality of cold energy storage and transportation systems provided on the hull, wherein the cold energy storage and transportation system comprises a plurality of cold storage medium tanks, a medium concentration detection and adjustment module, and a cold storage medium exchange station. The plurality of cold storage medium tanks are connected by a pipe system, and the cold storage medium tanks store cold storage medium; The bow of the hull is provided with a replacement buffer compartment, the replacement buffer compartment is connected to a submersible pump, the replacement buffer compartment is communicated with the cold storage medium compartment, the submersible pump is used to allocate cold storage medium, and the hull posture is adjusted by allocating cold storage medium between the replacement buffer compartment and the cold storage medium compartment; The medium concentration detection and adjustment module includes a medium concentration detection regulator and a medium filling system. The medium concentration detection regulator includes a cold storage medium concentration sampling tester. The medium filling system includes a medium tank and a filling device. The medium concentration detection regulator is connected to the medium filling system. When the ship arrives at the LNG port, FSRU, or terminal, the cold storage medium exchange station is connected to an external device, and the medium concentration detection and adjustment module receives the cold storage temperature instruction. Then, the medium concentration detection and adjustment module performs cold storage medium concentration detection, concentration adjustment, and cold storage medium position adjustment operations, so that the cold storage medium completes heat exchange with the external device through the cold storage medium exchange station to implement cold storage operation or cold release operation; The cold storage medium includes a first cold storage medium and a second cold storage medium, the temperature range of the first cold storage medium is -60°C to -40°C, and the temperature range of the second cold storage medium is -40°C to -20°C; The cold storage medium tank storing the first cold storage medium is located in the middle of the cold storage medium tank storing the second cold storage medium, and a plurality of the cold storage medium tanks are located in the cargo hold area of ​​the ship; The cold storage medium is a non-phase-changing liquid solution. The first cold storage medium and the second cold storage medium have the same structure and properties. The first cold storage medium and the second cold storage medium have different concentrations, and the concentration of the first cold storage medium is less than that of the second cold storage medium.

2. The LNG gasification cold storage medium transport ship according to claim 1, characterized in that: The cold storage medium cabin is a double-layer vacuum insulation cabin with a square closed structure, and the cold storage medium cabin includes a vacuum insulation inner cabin, a first vacuum interlayer cabin and a second vacuum insulation interlayer cabin. The cabin wall of the vacuum insulation inner cabin is made of stainless steel, and an insulation pad is provided between the first vacuum interlayer cabin and the second vacuum insulation interlayer cabin.

3. The LNG gasification cold storage medium transport ship according to claim 2, characterized in that: The first vacuum mezzanine cabin and the second vacuum insulation mezzanine cabin are both arranged with a number of vacuum suction riser assemblies, and the vacuum suction riser assemblies include a number of first porous risers evenly arranged in the first vacuum mezzanine cabin and a number of second porous risers evenly arranged in the second vacuum insulation mezzanine cabin, the first porous riser is connected to a first vacuum check valve and a first vacuum suction nozzle, and the second porous riser is connected to a second vacuum check valve and a second vacuum suction nozzle.

4. The LNG gasification cold storage medium transport ship according to claim 1, characterized in that: A deep-well cold storage pump is arranged on the top of the cold storage medium tank. The suction port of the deep-well cold storage pump is located at the upper-middle liquid level of the cold storage medium in the cold storage medium tank. The deep-well cold storage pump is used to perform cold storage operations. The cold storage medium in the cold storage medium tank is extracted through the suction port of the deep-well cold storage pump and then transferred to the LNG heat exchanger for heat exchange. The cold storage medium then flows back to the bottom of the cold storage medium tank through the lower cold storage return pipe of the deep-well cold storage pump to complete the cold storage operation. A submersible cold release pump is arranged at the inner bottom of the cold storage medium cabin. At the dock, the submersible cold release pump is used to transport the cold storage medium and deliver it to the user's heat exchanger for cold release. After cold release, the cold storage medium flows back into the cold storage medium cabin through the cold release return pipe located at the upper part of the cold storage medium cabin, completing the cold release operation.

5. An operating method for an LNG gasification cold storage medium transport ship, characterized in that: The operation method is implemented using the LNG gasification cold storage medium transport ship according to any one of claims 1 to 4, comprising the following steps: S1, completes cold storage operation at LNG port or FSRU; S11, before the cold storage operation, a cold storage plan is formulated according to the required cold storage capacity. The cold storage plan includes formulating the temperature of the cold storage medium and the cold storage volume, and then detecting and adjusting the cold storage medium concentration in the cold storage medium tank to match the corresponding cold storage medium temperature, or adjusting the cold storage medium tank according to the cold storage volume; S12, when the ship berths at the LNG port or FSRU, the cold storage medium exchange station is connected to the heat exchanger medium pipe of the LNG or FSRU; S13, the cold storage medium in the cold storage medium compartment undergoes heat exchange with the heat exchanger medium pipe through the cold storage medium exchange station, so that the cold storage medium performs cold storage operation according to the cold storage plan; S14, the cold storage medium after the cold storage operation returns to the cold storage medium cabin; S15, the medium concentration detection and adjustment module measures the temperature of the cold storage medium in the plurality of cold storage medium compartments, and determines whether the cold storage medium in each cold storage medium compartment has reached the cold storage capacity. When the cold storage capacity has been reached, the cold storage operation is completed and the cold storage medium compartment is sealed. S16, adjusting the ship's navigation posture on the water by replacing the buffer compartment; S2, the hull is moved to a cold unit for off-site cold release operation; S21, after the ship arrives at the user's wharf, it is connected to the heat exchanger medium pipeline of the cold user through the cold storage medium exchange station, and the cold storage medium is pumped out from the cold storage medium tank to the heat exchanger medium pipeline using a submersible cold release pump; After the cold storage medium releases its cold energy, the returned cold storage medium flows to the replacement buffer compartment for buffering. After the previous cold storage medium compartment is emptied and the cold storage medium compartment is emptied, it will serve as the next temporary buffer compartment. After all the cold storage media have released their cold energy, the cold storage medium in the replacement buffer compartment will be returned to the cold storage medium compartment that has completed the cold release operation last. Alternatively, when the replacement buffer compartment cannot be used, the returned cold storage medium will be returned to the corresponding cold storage medium compartment through the cold release return pipe on the upper part of the cold storage medium compartment to complete the cold release operation. S22, by replacing the buffer tank, the ship's navigation posture on the water is adjusted, and the ship moves to the LNG port or FSRU cycle to implement the next cold storage operation.

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