Full-flexible connection system for LNG loading and unloading berths with large water level differences in inland rivers

Abstract

The present invention relates to a fully flexible connection system for LNG loading and unloading berths with large water level differences in inland rivers, which includes an LNG loading and unloading terminal arranged on the shore and an LNG ship docked on the water side, and also includes an LNG loading and unloading line connection device, an emergency cut-off and disconnection device, a hydraulic protection device and a fall protection device; the LNG loading and unloading line connection device includes an LNG loading and unloading gas phase hose, an LNG loading and unloading liquid phase hose, a signal control line and an N2 power line; the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose are laid between the LNG loading and unloading terminal and the LNG ship, and the signal control line and the N2 power line are arranged on the side of the LNG loading and unloading gas phase hose. The present invention can be used not only in inland river LNG loading and unloading terminals with large water level differences, but also in other liquid bulk cargo transportation systems with large water level differences.

Description

Technical Field

[0001] The present invention relates to the field of LNG loading and unloading, and more specifically, to a fully flexible connection system for LNG loading and unloading berths with large water level differences in inland rivers. Background Art

[0002] For conventional large-scale coastal LNG loading and unloading terminals, the ship-shore barge connection basically uses rigid loading arms. The swivel joints of the loading arms are used to adapt to the degrees of freedom in various directions of the water level change and drift of LNG ships. However, the LNG loading arm equipment system is complex, has a large volume, heavy foundation load, high price, and is limited by the limited displacement compensation ability of the swivel joint, and cannot adapt to small and medium-sized LNG loading and unloading berths in inland rivers with large water level differences. The simple ship-shore LNG hose connection does not have the capabilities of displacement monitoring, emergency breakaway protection shutdown, and water hammer pressure relief safety protection, and has relatively high safety operation risks. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a fully flexible connection system for LNG loading and unloading berths with large water level differences in inland rivers, which has a simple structure, is convenient to install, and has high safety and stability.

[0004] The technical solution adopted by the present invention to solve its technical problems is: to construct a fully flexible connection system for LNG loading and unloading berths with large water level differences in inland rivers, including an LNG loading and unloading terminal arranged on the shore and an LNG ship docked on the water side, and further including an LNG loading and unloading line connection device, an emergency cut-off and disconnection device, a hydraulic protection device, and an anti-falling protection device;

[0005] The LNG loading and unloading line connection device includes an LNG loading and unloading gas-phase hose, an LNG loading and unloading liquid-phase hose, a signal control line, and an N2 power line; the LNG loading and unloading gas-phase hose and the LNG loading and unloading liquid-phase hose are laid between the LNG loading and unloading terminal and the LNG ship, and the signal control line and the N2 power line are arranged on the side of the LNG loading and unloading gas-phase hose;

[0006] The emergency cut-off and disconnection system includes a first ship-shore position sensor, a second ship-shore position sensor, a third ship-shore position sensor, a fourth ship-shore position sensor, a first breakaway valve, a second breakaway valve, a first quick connector, and a second quick connector; the first ship-shore position sensor and the second ship-shore position sensor are respectively arranged at the left and right ends of the LNG loading and unloading gas-phase hose, the third ship-shore position sensor and the fourth ship-shore position sensor are respectively arranged at the left and right ends of the LNG loading and unloading liquid-phase hose, the first breakaway valve is arranged at the right end of the LNG loading and unloading gas-phase hose, the second breakaway valve is arranged at the right end of the LNG loading and unloading liquid-phase hose, the first quick connector is arranged on the right side of the first breakaway valve, and the second quick connector is arranged on the right side of the second breakaway valve;

[0007] The hydraulic protection system includes a pressure sensor, a water hammer control valve, and a loading and unloading pipe; the loading and unloading pipe is arranged at the left end of the LNG loading and unloading gas phase hose, the water hammer control valve is arranged at the left end of the LNG loading and unloading liquid phase hose, and the pressure sensor is arranged on the left side of the water hammer control valve;

[0008] The anti-falling protection device includes an anti-falling pull ring, a cable, and a protective net; the protective net is located at the lower ends of the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose, the anti-falling pull ring is fixedly arranged on the LNG loading and unloading dock, and the four corners of the protective net are fixedly connected to the anti-falling pull ring through cables and are located on the waterside of the LNG loading and unloading dock.

[0009] According to the above solution, the LNG loading and unloading gas phase hose, the LNG loading and unloading liquid phase hose, the signal control line, and the N2 power line are fixedly combined through a line slot support.

[0010] According to the above solution, the line slot support includes a split pipe clamp, an upper PIR cold insulation block, and a lower IPR cold insulation block that are arranged in a wrapped manner from the inside to the outside.

[0011] According to the above solution, the left and right ends of the LNG loading and unloading gas phase hose are respectively connected to the LNG gas phase pipe, and the left and right ends of the LNG loading and unloading liquid phase hose are respectively connected to the LNG liquid phase pipe.

[0012] According to the above solution, a logic controller is arranged between the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose. The logic controller is electrically connected to the first ship-shore position sensor, the second ship-shore position sensor, the third ship-shore position sensor, and the fourth ship-shore position sensor respectively, and the logic controller is electrically connected to the N2 buffer tank.

[0013] According to the above solution, a hose guide seat is arranged between the LNG loading and unloading gas phase hose and the LNG loading and unloading dock and the LNG ship, and a hose guide seat is arranged between the LNG loading and unloading liquid phase hose and the LNG loading and unloading dock and the LNG ship.

[0014] According to the above solution, the hose guide seat includes a pin shaft, a bottom plate, and a support steel channel plate. The pin shaft is arranged at the lower ends of the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose. The bottom plate is arranged on the upper surfaces of the LNG loading and unloading dock and the LNG ship. Between the pin shaft and the bottom plate, a hydraulic cylinder upper column and a hydraulic cylinder lower column are arranged from top to bottom. Both the hydraulic cylinder upper column and the hydraulic cylinder lower column are two and are arranged in parallel. The support steel channel plate is internally provided with a PIR heat insulation layer, and the PIR heat insulation layer is internally provided with a polymer wear-resistant layer.

[0015] According to the above solution, the LNG gas pipeline and the LNG liquid pipeline are connected to the loading and unloading pipe through an insulating flange. The insulating flange includes a left flange and a right flange. The left flange and the right flange are bolted and fixed, and a low-temperature insulating gasket and a low-temperature insulating sleeve are arranged between the left flange and the right flange.

[0016] According to the above solution, both the first pull-off valve and the second pull-off valve include a left valve body and a right valve body arranged at the left and right ends. A nitrogen cavity is arranged between the left valve body and the right valve body, and a stress pin is arranged at the bottom end of the nitrogen cavity.

[0017] According to the above solution, fenders are arranged on the waterside of the LNG loading and unloading terminal.

[0018] Implementing the full-flexibility connection system for the LNG loading and unloading berth with large water level difference in inland rivers of the present invention has the following

[0019] Beneficial effects:

[0020] 1. The full-flexibility line of the present invention is combined through the line slot support. The hanging flexible pipeline has a large elastic space, and can flexibly adapt to the working conditions of large water level differences and the changes in ship displacement differences in different inland river projects; the ship-shore connection has the capabilities of displacement monitoring, emergency pull-off protection and shut-off, and water hammer pressure relief safety protection, with high safety and stability, simple structure, convenient installation, easy fabrication, easy adjustment of structural dimensions, flexible use, and strong operability;

[0021] 2. The hanging flexible pipeline of the present invention has a large elastic space and can flexibly adapt to the working conditions of large water level differences and the changes in ship displacement differences in different inland river projects; in addition to being used in the LNG loading and unloading terminal with large water level differences in inland rivers, it can also be used in other liquid bulk cargo transportation systems with large water level differences.

[0022] 3. When loading and unloading LNG, the present invention can adapt to the three-dimensional multi-dimensional changes of the loading and unloading ship interface under the condition of large water level difference, overcomes the disadvantages of small envelope range and poor adaptability of the loading and unloading arm, can withstand a larger displacement range, and meets higher requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0024] Figure 1 is the top view of the full-flexibility device connection system for the LNG loading and unloading berth with large water level difference in inland rivers of the present invention;

[0025] Figure 2 is the side view structural schematic diagram of the full-flexibility device system for the LNG loading and unloading berth with large water level difference in inland rivers of the present invention;

[0026] Figure 3 is the structural schematic diagram of the hose guide seat of the present invention;

[0027] Figure 4 It is a schematic cross-sectional structure diagram of the hose guide seat of the present invention;

[0028] Figure 5 It is a schematic structure diagram of the circuit card slot seat of the present invention;

[0029] Figure 6 It is a schematic structure diagram of the insulating flange of the present invention;

[0030] Figure 7 It is a schematic structure diagram of the pull-off valve of the present invention;

[0031] In the figure: 1. LNG loading and unloading terminal, 2. LNG ship, 3. Insulating flange, 4. Relief pipe, 5. Hose guide seat, 6. Water hammer control valve, 7. LNG gas-phase hose, 8. Signal control line, 9. N2 power line, 10. LNG liquid-phase hose, 11. Circuit card slot seat, 12. Logic controller, 13, 16, 17, 18. Position sensors, 14. Pressure sensor, 15. N2 buffer tank, 19, 21. Pull-off valves, 20, 22. Quick connectors, 23. Auxiliary crane, 1.1 / 2.1. LNG gas-phase pipelines, 1.2 / 2.2. LNG liquid-phase pipelines, 1.3. Pulling ring, 1.4. Cable, 1.5. Protection net, 1.5. Protection net, 1.6. Fender, 3.1. Left flange, 3.2. Right flange, 3.3. Nut, 3.4. Bolt, 3.5 / 3.6. Low-temperature insulating gasket, 3.7. Low-temperature insulating sleeve, 5.1. Pin shaft, 5.2 / 5.5. Upper columns of hydraulic cylinders, 5.3 / 5.6. Lower columns of hydraulic cylinders, 5.4. Bottom plate, 5.7. Support steel channel plate, 5.8. PIR thermal insulation layer, 5.9. High-molecular wear-resistant layer, 11.1. Two-part pipe clamp, 11.2. Upper PIR cold-insulation block, 11.3. Lower PIR cold-insulation block, 19 / 21.1. Left valve body, 19 / 21.2. Right valve body, 19 / 21.3. Nitrogen chamber, 19 / 21.4. Stress pin. Detailed implementation manners

[0032] For a clearer understanding of the technical features, objectives and effects of the present invention, the detailed implementation manners of the present invention are now described in detail with reference to the accompanying drawings.

[0033] As Figure 1-7 shown, the full-flexible connection system for LNG loading and unloading berths with large water level differences in inland rivers of the present invention includes an LNG loading and unloading terminal 1 arranged on the shore and an LNG ship 2 docked on the water side. A right auxiliary crane 23 is arranged on the upper part of the LNG loading and unloading terminal 1. It also includes an LNG loading and unloading line connection device, an emergency cut-off and disconnection device, a hydraulic protection device and a fall protection device.

[0034] The LNG loading and unloading line connection device includes an LNG loading and unloading gas phase hose 7, an LNG loading and unloading liquid phase hose 10, 8 signal control lines, and an N2 power line 9; the LNG loading and unloading gas phase hose 7 and the LNG loading and unloading liquid phase hose 10 are arranged between the LNG loading and unloading terminal 1 and the LNG ship 2, and the 8 signal control lines and the N2 power line are arranged on the side of the first LNG loading and unloading hose. The LNG loading and unloading gas phase hose 7 and the LNG loading and unloading liquid phase hose 10 are respectively used for the connection of liquid and gas phase LNG ship-shore loading and unloading, the 8 signal control lines are used for the transmission of signals such as displacement and pressure between the ship and the shore, and the N2 power line 9 is used for the nitrogen power transmission of the breakaway valve. The emergency cut-off and disconnection system includes a first ship-shore position sensor 13, a second ship-shore position sensor 17, a third ship-shore position sensor 16, a fourth ship-shore position sensor 18, a first breakaway valve 19, a second breakaway valve 21, a first quick connector 20, and a second quick connector 22; the first ship-shore position sensor 13 and the second ship-shore position sensor 17 are respectively arranged at the left and right ends of the LNG loading and unloading gas phase hose 7, the third ship-shore position sensor 16 and the fourth ship-shore position sensor 18 are respectively arranged at the left and right ends of the LNG loading and unloading gas phase hose 7, the first breakaway valve 19 is arranged at the right end of the LNG loading and unloading gas phase hose 7, the second breakaway valve 21 is arranged at the right end of the LNG loading and unloading liquid phase hose 10, the first quick connector 20 is arranged on the right side of the first breakaway valve 19, and the second quick connector 22 is arranged on the right side of the second breakaway valve 21. When the relative displacement difference between the ship and the shore exceeds the safety setting range of the ship-shore position sensor, the first breakaway valve 19 and the second breakaway valve 21 play a role in quickly cutting off and disconnecting.

[0035] The hydraulic protection system includes a pressure sensor 14, a water hammer control valve 6, and a loading and unloading pipe 4; the loading and unloading pipe 4 is arranged at the left end of the LNG loading and unloading gas phase hose 7, the water hammer control valve 6 is arranged at the left end of the LNG loading and unloading liquid phase hose 10, and the pressure sensor 14 is arranged on the left side of the water hammer control valve 6. It can release pressure in case of water hammer pressure or other abnormal pressure increases during quick cut-off and disconnection, avoiding over-limit pressure in the LNG loading and unloading pipeline. The anti-falling protection device includes an anti-falling pull ring 1.3, a cable 1.4, and a protective net 1.5; the protective net 1.5 is located at the lower ends of the LNG loading and unloading gas phase hose 7 and the LNG loading and unloading liquid phase hose 10, the anti-falling pull ring 1.3 is fixedly arranged on the LNG loading and unloading terminal 1, and the four corners of the protective net 1.5 are fixedly connected to the anti-falling pull ring 1.3 through the cable 1.4 and are located on the waterside of the LNG loading and unloading terminal 1. It can prevent the LNG loading and unloading line connection system and the emergency cut-off and disconnection system from falling and hitting the terminal structure, causing losses.

[0036] The LNG loading and unloading gas-phase hose 7, the LNG loading and unloading liquid-phase hose 10, 8 signal control lines, and the N2 power line 9 are combined and fixed through the line slot support 11, which can adapt to the high and low water levels of different projects and the changes in the ship displacement difference. The line slot support 11 includes a split pipe clamp 11.1, an upper PIR cold insulation block 11.2, and a lower IPR cold insulation block 11.3 that are arranged in a wrapped manner from the inside to the outside. The left and right ends of the LNG loading and unloading gas-phase hose 7 are respectively connected to the LNG gas-phase pipes, and the left and right ends of the LNG loading and unloading liquid-phase hose 10 are respectively connected to the LNG liquid-phase pipes. A logic controller 12 is arranged between the LNG loading and unloading gas-phase hose 7 and the LNG loading and unloading liquid-phase hose 10. The logic controller 12 is electrically connected to the first ship-shore position sensor 13, the second ship-shore position sensor 16, the third ship-shore position sensor 17, and the fourth ship-shore position sensor 18 respectively, and the logic controller 12 is electrically connected to the N2 buffer tank 15. A hose guide seat 5 is arranged between the LNG loading and unloading gas-phase hose 7 and the LNG loading and unloading terminal 1 and the LNG ship 2. A hose guide seat 5 is also arranged between the LNG loading and unloading liquid-phase hose and the LNG loading and unloading terminal 1 and the LNG ship 2.

[0037] The hose guide seat 5 includes a pin shaft 5.1, a bottom plate 5.4, and a support steel channel plate 5.7. The pin shaft 5.1 is arranged at the lower ends of the LNG loading and unloading gas-phase hose 7 and the LNG loading and unloading liquid-phase hose 10. The bottom plate 5.4 is arranged on the upper surfaces of the LNG loading and unloading terminal 1 and the LNG ship 2. Between the pin shaft 5.1 and the bottom plate 5.4, upper hydraulic cylinder columns 5.2 / 5.5 and lower hydraulic cylinder columns 5.3 / 5.6 are arranged from top to bottom. Both the upper hydraulic cylinder columns 5.2 / 5.5 and the lower hydraulic cylinder columns 5.3 / 5.6 are two and are arranged in parallel. A PIR heat insulation layer 5.8 is arranged inside the support steel channel plate 5.7, and a polymer wear-resistant layer 5.9 is arranged inside the PIR heat insulation layer 5.8. The LNG loading and unloading gas-phase hose 7 and the LNG loading and unloading liquid-phase hose 10 are connected to the loading and unloading pipes 4 through insulating flanges 3. The insulating flange 3 includes a left flange 3.1 and a right flange 3.2. The left flange 3.1 and the right flange 3.2 are connected and fixed by bolts 3.4, and the bolts 3.4 are matched with nuts 3.3. Between the left flange 3.1 and the right flange 3.2, low-temperature insulating gaskets 3.5 / 3.6 and a low-temperature insulating sleeve 3.7 are arranged. Both the first pull-off valve 19 and the second pull-off valve 21 include a left valve body 19 / 21.1 and a right valve body 19 / 21.2 arranged at the left and right ends. A nitrogen cavity 19 / 21.3 is arranged between the left valve body 19 / 21.1 and the right valve body 19 / 21.2, and a stress pin 19 / 21.4 is arranged at the bottom end of the nitrogen cavity 19 / 21.3. A fender 16 is arranged on the water-facing side of the LNG loading and unloading terminal 1.

[0038] The working process of the present invention is as follows:

[0039] After the LNG ship 2 berths at the LNG loading and unloading terminal 1, the hose guide seat 5 is lifted by the auxiliary crane 23 installed on the upper part of the LNG loading and unloading terminal 1 to the connection end of the LNG liquid pipeline 2.2 and the LNG gas pipeline 2.1 of the LNG ship 2; the LNG loading and unloading line connection system is lifted by the auxiliary crane 23 to the LNG ship 2 and placed on the upper part of the hose guide seat 5, and is quickly connected by the first quick connector 20 and the second quick connector 22. At the same time, the height of the upper column 5.2 of the hydraulic cylinder in the hose guide seat 5 installed at the lower ends of the LNG loading and unloading terminal 1 and the LNG ship 2 is adjusted to adapt to the pipe orifice elevation of the LNG liquid pipeline 1.2 / 2.2 and the LNG gas pipeline 1.1 / 2.1. At the same time, the height of the upper column 5.5 of the hydraulic cylinder is adjusted so that the support groove steel plate 5.7 rotates around the pin shaft 5.1 to an appropriate radian to ensure that the curvature radii of the LNG gas hose 7 and the LNG liquid hose 10 are within the allowable range of the specification. The upper part of the support groove steel plate 5.7 is equipped with a PIR heat insulation layer 5.8 to isolate the LNG low-temperature damage and a high-molecular wear-resistant layer 5.9 to prevent the LNG loading and unloading hoses 7 / 10 from being worn.

[0040] When the LNG ship 2 berths at the LNG loading and unloading terminal 1, the first ship-shore position sensor 13, the second ship-shore position sensor 16, the third ship-shore position sensor 17 and the fourth ship-shore position sensor 18 feedback the position signals to the logic controller 12. When the relative displacement difference between the ship and the shore exceeds the safety setting range of the first ship-shore position sensor 13, the second ship-shore position sensor 16, the third ship-shore position sensor 17 and the fourth ship-shore position sensor 18, the logic controller 12 outputs an action signal to the N2 buffer tank 1515 to release the nitrogen power, through the N2 power line 9 to the nitrogen chambers 19 / 21.3 of the breakaway valves 19 / 21, and the expansion stress pins 19 / 21.4 break, playing a role of quick cut-off and isolation.

[0041] During the normal LNG loading and unloading process, the pressure sensor 14 feedbacks the pressure signals of the LNG liquid pipelines 1.2 / 2.2 to the logic controller 12. When the water hammer pressure generated by the quick cut-off exceeds the design pressure of the LNG liquid pipeline 1.2, the logic controller 12 outputs a signal to the water hammer control valve 6, and discharges the overpressure LNG to the LNG gas pipeline 1.1 through the loading and unloading pipe 4 to prevent the pipeline from being damaged due to overpressure.

[0042] After the quick cut-off occurs, the LNG loading and unloading line drops to the anti-falling protection system along the hose guide seat 5. The anti-falling protection system includes an anti-falling pull ring 1.3, a cable 1.4 and a protective net 1.5. The protective net 1.5 is suspended on the LNG loading and unloading terminal 1 through the anti-falling pull ring 1.3 and the cable 1.4. The flexible protective net prevents the LNG loading and unloading line connection system and the emergency cut-off disconnection system from falling and hitting the terminal structure, causing losses.

[0043] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. A fully flexible connection system for inland river large water level difference LNG loading and unloading berths, comprising an LNG loading and unloading terminal arranged on the shore and an LNG ship moored on the water side, characterized in that: It also includes LNG loading and unloading line connection devices, emergency cut-off and release devices, hydraulic protection devices and anti-fall protection devices; The LNG loading and unloading line connection device includes an LNG loading and unloading gas phase hose, an LNG loading and unloading liquid phase hose, a signal control line and an N2 power line; the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose are arranged between the LNG loading and unloading terminal and the LNG ship, and the signal control line and the N2 power line are arranged on the side of the LNG loading and unloading gas phase hose; The emergency cut-off and disengagement device comprises a first ship-shore position sensor, a second ship-shore position sensor, a third ship-shore position sensor, a fourth ship-shore position sensor, a first breakaway valve, a second breakaway valve, a first quick connector and a second quick connector; the first ship-shore position sensor and the second ship-shore position sensor are respectively arranged at the left and right ends of the LNG loading and unloading gas phase hose, the third ship-shore position sensor and the fourth ship-shore position sensor are respectively arranged at the left and right ends of the LNG loading and unloading liquid phase hose, the first breakaway valve is arranged at the right end of the LNG loading and unloading gas phase hose, the second breakaway valve is arranged at the right end of the LNG loading and unloading liquid phase hose, the first quick connector is arranged at the right side of the first breakaway valve, and the second quick connector is arranged at the right side of the second breakaway valve; The hydraulic protection device includes a pressure sensor, a water hammer control valve and a loading and unloading pipe; the loading and unloading pipe is arranged at the left end of the LNG loading and unloading gas phase hose, the water hammer control valve is arranged at the left end of the LNG loading and unloading liquid phase hose, and the pressure sensor is arranged on the left side of the water hammer control valve; The anti-fall protection device comprises an anti-fall pull ring, a cable and a protective net; the protective net is located at the lower end of the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose, the anti-fall pull ring is fixedly arranged on the LNG loading and unloading wharf, and the four corners of the protective net are fixedly connected to the anti-fall pull ring through the cable and are located on the water side of the LNG loading and unloading wharf; The LNG loading and unloading gas phase hose, LNG loading and unloading liquid phase hose, signal control line and N2 power line are fixed by a line card slot support assembly; A logic controller is provided between the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose, and the logic controller is electrically connected to the first ship-shore position sensor, the second ship-shore position sensor, the third ship-shore position sensor and the fourth ship-shore position sensor, respectively, and the logic controller is electrically connected to the N2 buffer tank; A hose guide seat is provided between the LNG loading and unloading gas phase hose and the LNG loading and unloading wharf and the LNG ship, and a hose guide seat is provided between the LNG loading and unloading liquid phase hose and the LNG loading and unloading wharf and the LNG ship; The hose guide seat includes a pin shaft, a bottom plate and a supporting steel trough plate. The pin shaft is arranged at the lower end of the LNG loading and unloading gas phase hose and the LNG loading and unloading liquid phase hose. The bottom plate is arranged on the upper surface of the LNG loading and unloading terminal and the LNG ship. An upper column of a hydraulic cylinder and a lower column of a hydraulic cylinder are arranged from top to bottom between the pin shaft and the bottom plate. There are two upper columns and two lower columns of the hydraulic cylinder and they are arranged in parallel. A PIR thermal insulation layer is arranged inside the supporting steel trough plate, and a polymer wear-resistant layer is arranged inside the PIR thermal insulation layer.

2. The fully flexible connection system for inland river large water level difference LNG loading and unloading berths according to claim 1 is characterized in that: The line card slot support comprises a two-part pipe clamp, an upper PIR cold insulation block and a lower IPR cold insulation block which are wrapped from the inside to the outside.

3. The fully flexible connection system for inland river large water level difference LNG loading and unloading berths according to claim 1 is characterized in that: The left and right ends of the LNG loading and unloading gas phase hose are respectively connected to the LNG gas phase pipe, and the left and right ends of the LNG loading and unloading liquid phase hose are respectively connected to the LNG liquid phase pipe.

4. The fully flexible connection system for inland river large water level difference LNG loading and unloading berths according to claim 3 is characterized in that: The LNG gas phase pipe and the LNG liquid phase pipe are connected to the loading and unloading pipe through insulating flanges. The insulating flanges include a left flange and a right flange. The left flange and the right flange are bolted and fixed. A low-temperature insulating gasket and a low-temperature insulating sleeve are arranged between the left flange and the right flange.

5. The fully flexible connection system for inland river large water level difference LNG loading and unloading berths according to claim 1 is characterized in that: The first breakaway valve and the second breakaway valve both include a left valve body and a right valve body arranged at left and right ends, a nitrogen cavity is arranged between the left valve body and the right valve body, and a stress pin is arranged at the bottom end of the nitrogen cavity.

6. The fully flexible connection system for inland river large water level difference LNG loading and unloading berths according to claim 1 is characterized in that: The water side of the LNG loading and unloading terminal is provided with a fender.

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