LNG gasification cold storage medium transport ship and operation method thereof

Abstract

The invention relates to the technical field of ships and ocean engineering, in particular to an LNG gasification cold storage medium transport ship and an operation method thereof.The LNG gasification cold storage medium transport ship comprises a plurality of cold energy storage and transportation systems arranged on a ship body, and each cold energy storage and transportation system comprises a plurality of cold storage medium cabins, a medium concentration detecting and adjusting module and a cold storage medium exchange station; the plurality of cold storage medium cabins are communicated through a pipe system; when the ship body arrives at an LNG port or an FSRU or a wharf, the cold storage medium exchange station is connected to external equipment, the medium concentration detection and adjustment module receives a cold storage temperature instruction, and then the medium concentration detection and adjustment module carries out cold storage medium concentration detection, cold storage medium concentration adjustment and cold storage medium bin adjustment operation. And the cold storage medium completes heat exchange with external equipment through the cold storage medium exchange station so as to implement cold storage operation or cold release operation. According to the system and the method, efficient utilization of cold energy during LNG gasification operation is realized.

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 ships, known as "super freezers at sea", contain considerable cold energy resources. A large amount of cold energy is generated during the unloading and gasification process at LNG receiving stations. Supporting cold energy utilization units are often built near the receiving stations. For safety reasons, LNG receiving stations are located in remote areas, far away from most cold energy users, such as power plants, residential areas, computer centers, biopharmaceutical factories, offshore cold water aquaculture bases and other cold units, resulting in limited cold energy utilization objects and difficulty in obtaining extensive multi-party collaborative applications. Secondly, the LNG gasification operation time often does not match the cold energy demand time, which hinders the flexibility of cold energy utilization. Moreover, the LNG gasification operation area and cold energy utilization area of ​​traditional LNG receiving stations are planned separately, with long intervals between areas and low cold energy utilization efficiency. There is no effective utilization of cold energy and no cold storage measures. On the other hand, the low-temperature freezing temperature (-60°C to -40°C) and refrigeration temperature (-40°C and -20°C) carriers produced 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 ship and an operation method thereof, which solves the problem of low cold energy utilization rate during the existing LNG gasification operation. By providing an LNG gasification cold storage medium transport ship, efficient utilization of cold energy during LNG gasification operation is achieved, energy consumption is saved, and resource utilization is improved.

[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 comprise a plurality of cold storage medium tanks, a medium concentration detection and adjustment module, and a cold storage medium exchange station, wherein the plurality of cold storage medium tanks are connected through a pipe system, and the cold storage medium tanks store cold storage medium; When the hull arrives at the LNG port, FSRU or dock, the cold storage medium exchange station is connected to the external equipment, 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 storage operation, 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.

[0005] 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℃.

[0006] 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.

[0007] 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.

[0008] 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 insulation pad is arranged between the first vacuum interlayer tank and the second vacuum insulation interlayer tank.

[0009] 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 plurality of vacuum suction vertical pipe assemblies, and the vacuum suction vertical pipe assemblies include a plurality of first porous vertical pipes evenly arranged in the first vacuum interlayer cabin and a plurality of second porous vertical pipes evenly arranged in the second vacuum insulation interlayer cabin, the first porous vertical pipe is connected with a first vacuum check valve and a first vacuum suction nozzle, and the second porous vertical pipe is connected with a second vacuum check valve and a second vacuum suction nozzle.

[0010] 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, 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 tank and the cold storage medium tank, so as to replace the ballast system and the ballast tank.

[0011] 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 a filling equipment, and the medium concentration detection regulator is connected to the medium filling system.

[0012] A further improvement of the LNG gasification 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, the suction port of the deep well cold storage pump is located at the middle and upper 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, and 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, completing the cold storage operation; A submersible cold release pump is arranged at the inner bottom of the cold storage medium tank. 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 tank through the cold release return pipe located at the upper part of the cold storage medium tank, completing the cold release operation.

[0013] The present invention also provides an operation method of an LNG gasification cold storage medium transport ship, and the operation method is implemented by using the LNG gasification cold storage medium transport ship as described above, comprising the following steps: S1, complete the cold storage operation at the 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 concentration of the cold storage medium in the cold storage medium tank to match the temperature of the corresponding cold storage medium, 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 tank is heat exchanged with the medium pipe of the heat exchanger 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 a plurality of cold storage medium compartments, determines whether the cold storage medium in each cold storage medium compartment has reached the cold storage volume, and when the cold storage volume has been reached, completes the cold storage operation and seals the cold storage medium compartment; S16, adjusting the navigation posture of the ship on water by replacing the buffer compartment; S2, the ship moves to a cold unit for off-site cold release operations; 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 by the submersible cold release pump using the 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 after releasing the cold energy, 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 finally completed the cold release operation; or, when the replacement buffer compartment cannot be used, the returned cold storage medium is 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, the ship's navigation posture on the water is adjusted by replacing the buffer tank, and the ship moves to the LNG port or FSRU cycle to implement the next cold storage operation.

[0014] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The LNG gasification cold storage medium transport ship of the present application can safely realize the storage and transportation of the cold energy released in the LNG gasification operation. The cold storage is not subject to the passive space limitation and passive time limitation of the LNG gasification operation. The cold energy can be stored and transported to the user terminal in a different place for release, thus expanding the scope of LNG cold energy users and solving the problem of mismatch between the space and time of LNG gasification and cold energy utilization. The LNG gasification cold storage medium transport ship of the present application realizes the cycle operation of gasification-cold storage-cold storage-transportation-remote cold energy release through the non-phase-changing cold storage medium, and systematically solves the problem of coordination and unification of various functions; The LNG gasification cold storage medium transport ship of the present application can make full use of the hull space, reasonably divide and layout the cold energy storage area, have a compact structure, reduce cold loss, and achieve the best cold storage and thermal insulation 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 cold storage medium with a lower temperature to the outer side of the ship, reduces the risk of cold storage medium leakage caused by accidental collision and damage to the tank, avoids brittle cracking of the hull steel plate, and ensures the safety of the ship structure. The cold storage medium tank of the present application adopts a square double-layer vacuum structure, which is simple to build and suitable for large-capacity square insulation, especially suitable for storage at low-temperature freezing temperature, i.e., critical steel cold brittle temperature (-60°C~-40°C). The structure has high cost performance and good insulation 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 has a large tank capacity utilization rate. The LNG gasification cold storage medium transport ship of the present application has no ballast system and ballast tank design, which reduces the ship construction cost, increases the cargo capacity, and reduces the workload of ship operation; The LNG gasification cold storage medium transport ship of the present application can realize the storage of different temperature qualities or different cold storage media in separate compartments, and more conveniently provide different qualities of cold energy to users who need cold energy, which is convenient for users to choose. Low-temperature freezing temperature (-60℃ to -40℃) and freezing temperature (-40℃ and -20℃) cold storage carriers are widely needed, especially in the fields of food processing and biopharmaceuticals. At the same time, this temperature range is compatible with the cold demand of other industries, power generation and aquaculture. Therefore, cold storage media containing cold are widely used, but there is currently no such cold storage medium transportation equipment and method; The cold storage medium transportation, cold storage operation, and cold release operation of the LNG gasification cold storage medium transport ship of the present application do not involve explosive gases and liquids. The safety level of the entire ship equipment is selected and arranged according to Z2 and above, achieving economy based on the safety of the entire operation chain; 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 is used as a buffer empty 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 manner and improve the efficiency; The cold storage medium concentration detection and adjustment module 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. This can prevent the cold storage medium from aging and ensure that the medium's cold storage capacity remains unchanged. It can also adjust the cold storage medium concentration according to the cold storage plan to achieve the cold storage capacity required for transportation.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0017] Figure 1 This is a schematic diagram of the cold storage medium tank in the LNG gasification cold storage medium transport ship of the present application. Figure 1 .

[0018] Figure 2This is a schematic diagram of the cold storage medium tank in the LNG gasification cold storage medium transport ship of the present application. Figure 2 .

[0019] Reference numerals: 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 porous vertical pipe; 64. First 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

[0020] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0021] Combine the following Figure 1 and Figure 2 The present application describes an LNG gasification cold storage medium transport ship, including a plurality of cold energy storage and transportation systems arranged on a hull 7, the cold energy storage and transportation system including a plurality of cold storage medium tanks, a medium concentration detection and adjustment module 10 and a cold storage medium exchange station 9, the plurality of cold storage medium tanks are connected by a pipe system, the cold storage medium tanks store cold storage medium, the main deck of the hull 7 is equipped with a pipe system and a medium concentration detection and adjustment module 10, and a cold storage medium exchange station 9 is arranged on the ship side of the main deck; When the hull 7 arrives at the LNG port, FSRU or dock, the cold storage medium exchange station 9 is connected to the external equipment, 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 warehouse 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 operations or cold release operations.

[0022] In a preferred implementation case 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℃ (steel plate cold brittle temperature), 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 in need of cold. Cold storage media of different temperature ranges are compatible with a wide range of industrial and aquaculture industry cold demands. The carrying method of the cold storage medium of the device is more convenient for users to choose according to their needs.

[0023] Specifically, the cold energy storage and transportation system storing the first cold storage medium is used as the low-temperature freezing cold storage system 81 , and the cold energy storage and transportation system storing the second cold storage medium is used as the freezing cold storage system 82 .

[0024] 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, it will brittle the hull 7 steel plate 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, and 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, and 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 cold preservation 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 of the ship, avoiding brittle fracture of the hull 7 steel plate and ensuring the safety of the ship structure.

[0025] Specifically, the cold storage medium is a liquid solution with high heat capacity, wide phase change temperature range and chemical stability without phase change. The first cold storage medium and the second cold storage medium have the same structure and properties, but different concentrations of the first cold storage medium and the second cold storage medium. The concentration of the first cold storage medium is less than that of the second cold storage medium. Different cold storage capacities of cold storage media with different concentrations are utilized to realize cold storage and storage and transportation of media of different temperatures in 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 circulated for a long time.

[0026] Preferably, the deck of the hull 7 is designed to be flat to facilitate equipment layout 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 respectively to exchange the cold energy of the cold storage medium.

[0027] 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.

[0028] Preferably, the square double-layer insulation vacuum structure of the cold storage medium tank is simple to build and low in cost. It is suitable for the insulation effect of cold storage medium at -20℃~-60℃, and has high cost performance. It is especially suitable for storing the set low-temperature freezing temperature, i.e., the critical cold brittle temperature of steel, and is easy to hoist as a whole. The shape of the cold storage medium tank has a high degree of freedom, and can fully fit the hull 7. The layout and construction in the hull 7 are convenient, which improves the utilization rate of the hull 7 space and can effectively increase the tank capacity. The bottom of the cold storage medium tank adopts a composite bottom plate, which improves the bearing capacity and stability, reduces the weight of the hull 7, and serves as a protective structure of the cold storage medium tank to prevent the cold storage medium tank from leaking and causing low-temperature brittle cracking damage to the steel plate of the hull 7.

[0029] Furthermore, the first vacuum mezzanine cabin 2 and the second vacuum insulation mezzanine cabin 3 are both arranged with a plurality of vacuum suction vertical pipe assemblies, and the vacuum suction vertical pipe assemblies include a plurality of first porous vertical pipes 64 evenly arranged in the first vacuum mezzanine cabin 2 and a plurality of second porous vertical pipes 63 evenly arranged in the second vacuum insulation mezzanine cabin, the first porous vertical pipe 64 is connected to a first vacuum check valve and a first vacuum suction nozzle 62, and the second porous vertical pipe 63 is connected to a second vacuum check valve and a second vacuum suction nozzle 61.

[0030] Preferably, a sealed protection box is provided on the deck of the hull 7, and the first vacuum check valve, the second vacuum check valve, the first vacuum suction nozzle 62 and the second vacuum suction nozzle 61 are located inside the sealed protection box, and a box cover is hinged on one side of the sealed protection box to perform secondary sealing of the vacuum degree. The vacuum suction vertical pipe assembly is used to detect the vacuum degree of the interlayer of the first vacuum interlayer cabin 2 and the second vacuum insulation interlayer cabin 3 and to suck the gas in the interlayer of the double-layer vacuum insulation cabin to achieve a certain vacuum degree requirement. After vacuum exhaust treatment, the complex technology and high cost problems of large-space vacuum suction are avoided. In addition, multiple groups of insulating pads and perforated plates play a supporting role to improve the structural stability of the cabin. Multiple cold storage medium cabins share a bulkhead plate, and a joint cold preservation form is formed between the cabins.

[0031] Furthermore, a replacement buffer cabin 83 is provided at the bow of the hull 7, and the replacement buffer cabin 83 is connected to a submersible pump. The replacement buffer cabin 83 is connected to the cold storage medium cabin, and 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 cabin 83 and the cold storage medium cabin 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, improves the carrying speed of the ship, and effectively achieves energy-saving effects.

[0032] Furthermore, the medium concentration detection and regulation module 10 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.

[0033] Preferably, the medium concentration detection and adjustment module 10 can adjust the medium concentration to adapt to the cold storage medium storing different temperatures. In daily life, because the cold storage medium is a mixed solution that is circulated and used, the cold storage medium is volatile, and the concentration reduction of the cold storage medium will directly affect the cold storage effect. If the cold storage medium concentration sampling tester detects that the concentration of the cold storage medium has decreased, pure cold storage medium will be added from the medium tank to the cold storage medium compartment through the filling equipment, and adjusted to a suitable cold storage medium concentration content, so as to facilitate monitoring and adjusting the cold storage quality of the cold storage medium at any time, so as 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 the aging of the mixed liquid from affecting the cold energy storage effect.

[0034] 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) to be stored can be selected accordingly to meet the requirements of the cold storage capacity plan.

[0035] Furthermore, a deep well cold storage pump 5 is arranged on the top of the cold storage medium tank, and the suction port of the deep well cold storage pump 5 is located at the middle and upper 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, and 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, so that the temperature of the cold storage medium is reduced, and the cold storage medium 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; A submersible cold release pump 4 is arranged at the inner bottom of the cold storage medium tank. At the dock, the submersible cold release pump 4 is used to transport the cold storage medium to the user heat exchanger for cold release. After the cold release, the cold storage medium flows back to 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. 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 to distinguishing different cycles, reducing heat energy conduction, and improving the overall efficiency of cold storage.

[0036] The present application also provides an operation method of an LNG gasification cold storage medium transport ship, and the operation method is implemented using the above LNG gasification cold storage medium transport ship, including the following steps: S1, complete the cold storage operation at the 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 concentration of the cold storage medium in the cold storage medium tank to match the temperature of the corresponding cold storage medium, or adjusting the cold storage medium tank according to the cold storage volume; S12, when the ship 7 is berthed at the LNG port or FSRU, the cold storage medium exchange station 9 is connected to the heat exchanger medium pipe of the LNG or FSRU; S13, the cold storage medium in the cold storage medium tank is heat exchanged 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; 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 10 measures the temperature of the cold storage medium in a plurality of cold storage medium compartments, and determines whether the cold storage medium in each cold storage medium compartment has reached the cold storage volume. When the cold storage volume has been reached, the cold storage operation is completed, and the cold storage medium compartment is sealed; S16, adjusting the water navigation posture of the hull 7 by replacing the buffer compartment 83; S2, the hull 7 moves to a cold unit to perform cold release operations at a different location; S21, after the ship 7 arrives at the user's wharf, it is connected to the heat exchanger medium pipeline of the cold unit through the cold storage medium exchange station 9, and the submersible cold release pump 4 is used to perform the cold storage medium outflow operation, and the cold storage medium is pumped out from the cold storage medium tank through the submersible cold release pump 4 to the heat exchanger medium pipeline; 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 after releasing the cold energy, it will be used 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 finally 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 at the upper part of the cold storage medium compartment to complete the cold release operation. S22, by replacing the buffer tank 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.

[0037] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The LNG gasification cold storage medium transport ship of the present application can safely realize the storage and transportation of the cold energy released in the LNG gasification operation. The cold storage is not subject to the passive space limitation and passive time limitation of the LNG gasification operation. The cold energy can be stored and transported to the user terminal in a different place for release, thus expanding the scope of LNG cold energy users and solving the problem of mismatch between the space and time of LNG gasification and cold energy utilization. The LNG gasification cold storage medium transport ship of the present application realizes the cycle operation of gasification-cold storage-cold storage-transportation-remote cold energy release through the non-phase-changing cold storage medium, and systematically solves the problem of coordination and unification of various functions; The LNG gasification cold storage medium transport ship of the present application can make full use of the space of the hull 7, reasonably divide and layout the cold energy storage area, have a compact structure, reduce the loss of cold, 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, and 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, which reduces the risk of cold storage medium leakage caused by accidental collision and damage to the tank of the ship, avoids brittle cracking and damage of the hull 7 steel plate, and ensures the safety of the ship structure. The cold storage medium tank of the present application adopts a square double-layer vacuum structure, which is simple to build and suitable for large-capacity square insulation, especially suitable for storage at low-temperature freezing temperature, i.e., critical steel cold brittle temperature (-60°C~-40°C). The structure has high cost performance and good insulation 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 has a large tank capacity utilization rate. The LNG gasification cold storage medium transport ship of the present application has no ballast system and ballast tank design, which reduces the ship construction cost, increases the cargo capacity, and reduces the workload of ship operation; The LNG gasification cold storage medium transport ship of the present application can realize the storage of different temperature qualities or different cold storage media in separate compartments, and more conveniently provide different qualities of cold energy to users who need cold energy, which is convenient for users to choose. Low-temperature freezing temperature (-60℃ to -40℃) and freezing temperature (-40℃ and -20℃) cold storage carriers are widely needed, especially in the fields of food processing and biopharmaceuticals. At the same time, this temperature range is compatible with the cold demand of other industries, power generation and aquaculture. Therefore, cold storage media containing cold are widely used, but there is currently no such cold storage medium transportation equipment and method; The cold storage medium transportation, cold storage operation, and cold release operation of the LNG gasification cold storage medium transport ship of the present application do not involve explosive gases and liquids. The safety level of the entire ship's equipment is selected and arranged according to Z2 level and above, achieving economy based on the safety of the entire operation chain; 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 is used as a buffer empty 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 manner and improve the efficiency; 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. This 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.

[0038] 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 embodiments of the present invention.

Claims

1. An LNG gasification cold storage medium transport ship, characterized in that: It comprises a plurality of cold energy storage and transportation systems arranged on the hull, wherein the cold energy storage and transportation systems comprise a plurality of cold storage medium tanks, a medium concentration detection and adjustment module and a cold storage medium exchange station, wherein the plurality of cold storage medium tanks are connected through a pipe system, and the cold storage medium tanks store cold storage medium; When the hull arrives at the LNG port, FSRU or dock, the cold storage medium exchange station is connected to the external equipment, 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 storage operation, 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.

2. The LNG gasification cold storage medium transport ship according to claim 1, characterized in 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°C to -40°C, and the temperature range of the second cold storage medium is -40°C to -20°C.

3. The LNG gasification cold storage medium transport ship according to claim 2, characterized in 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 a plurality of the cold storage medium tanks are located in the cargo hold area of ​​the hull.

4. The LNG gasification cold storage medium transport ship according to claim 2, characterized in 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. The concentration of the first cold storage medium is less than that of the second cold storage medium.

5. 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 arranged between the first vacuum interlayer cabin and the second vacuum insulation interlayer cabin.

6. The LNG gasification cold storage medium transport ship according to claim 5, characterized in that: The first vacuum mezzanine cabin and the second vacuum insulation mezzanine cabin are both arranged with a plurality of vacuum suction vertical pipe assemblies, and the vacuum suction vertical pipe assemblies include a plurality of first porous vertical pipes evenly arranged in the first vacuum mezzanine cabin and a plurality of second porous vertical pipes evenly arranged in the second vacuum insulation mezzanine cabin, the first porous vertical pipe is connected with a first vacuum check valve and a first vacuum suction nozzle, and the second porous vertical pipe is connected with a second vacuum check valve and a second vacuum suction nozzle.

7. The LNG gasification cold storage medium transport ship according to claim 1, characterized in that: The bow of the hull is provided with a replacement cache compartment, the replacement cache compartment is connected to a submersible pump, the replacement cache compartment is connected to 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 cache compartment and the cold storage medium compartment.

8. The LNG gasification cold storage medium transport ship according to claim 1, characterized in 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 a filling device. The medium concentration detection regulator is connected to the medium filling system.

9. 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, and the suction port of the deep well cold storage pump is located at the middle and upper 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 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 tank. 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 tank through the cold release return pipe located at the upper part of the cold storage medium tank, completing the cold release operation.

10. An operating method for an LNG gasification cold storage medium transport ship, characterized in that: Using the LNG gasification cold storage medium transport ship according to any one of claims 1 to 9 to implement the operation method comprises the following steps: S1, complete the cold storage operation at the 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 concentration of the cold storage medium in the cold storage medium tank to match the temperature of the corresponding cold storage medium, 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 tank is heat exchanged with the medium pipe of the heat exchanger 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 a plurality of cold storage medium compartments, determines whether the cold storage medium in each cold storage medium compartment has reached the cold storage volume, and when the cold storage volume has been reached, completes the cold storage operation and seals the cold storage medium compartment; S16, adjusting the navigation posture of the ship on water by replacing the buffer compartment; S2, the ship moves to a cold unit for off-site cold release operations; 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 by the submersible cold release pump using the 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 after releasing the cold energy, 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 finally completed the cold release operation; or, when the replacement buffer compartment cannot be used, the returned cold storage medium is 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, the ship's navigation posture on the water is adjusted by replacing the buffer tank, and the ship moves to the LNG port or FSRU cycle to implement the next cold storage operation.

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