Fuel storage tank for dual-fuel powered ships

Abstract

The present invention discloses a fuel storage tank for a dual-fuel powered ship, belonging to the technical field of fuel storage tanks, comprising a mounting assembly, the mounting assembly being connected to an active compensation assembly for actively compensating when the ship sways from side to side, the mounting assembly being connected to a modular outer tank assembly, and the outer tank assembly being connected to an inner tank assembly for storing liquefied natural gas (LNG). In the above manner, the present invention actively compensates for the left and right swaying generated during the ship's travel through the active compensation assembly, thereby helping to maintain the uniformity of the liquefied natural gas (LNG). By providing a modular outer tank assembly, the outer tank assembly can be replaced separately in the event of seawater corrosion, saving maintenance costs. A first hydraulic-electric combined slip ring is provided so that the extraction end of the submersible pump is always located at the bottom of the liquid level, and cavitation will not occur. The spiral blades divide the liquefied natural gas (LNG) into multiple groups of areas, and the damping effect and the opposing forces of the two groups of spiral blades can greatly reduce the fluctuation of the swaying of the liquefied natural gas (LNG).

Description

Technical Field

[0001] The present invention relates to the technical field of fuel storage tanks, and in particular to a fuel storage tank for a dual-fuel powered ship. Background Art

[0002] As the global shipping industry actively pursues energy conservation, emission reduction, and green development, the marine and offshore industries are undergoing profound transformation. In recent years, green ship technologies have become a key focus of industry development. Dual-fuel propulsion vessels, with their significant advantages in environmental protection and energy efficiency, have become a core development trend in future ocean-going vessel manufacturing. Numerous large and medium-sized shipyards have invested heavily in developing the dual-fuel propulsion market, striving to gain a foothold in this emerging sector.

[0003] As a low-temperature pressure vessel, the fuel tank is responsible for storing fuels such as liquefied natural gas (LNG), which will provide energy support for the ship's power system.

[0004] However, existing fuel tanks are typically fixed to the ship's hull. Waves, wind, and other factors cause the ship to frequently rock from side to side during navigation, causing the LNG in the tank to slosh violently. This sloshing can cause stratification, with layers of LNG of varying densities gradually separating. This can also cause the LNG to roll over, causing large amounts of LNG to rapidly vaporize and instantly increase pressure within the tank. This not only seriously impacts LNG quality but also significantly increases safety risks, potentially leading to overpressure in the tank, triggering the safety valve to trip, or even more serious accidents.

[0005] At the same time, the outer shells of existing fuel storage tanks are mostly monolithic structures. Ships sailing in seawater environments for extended periods of time expose the outer shells to continuous corrosion. Once localized corrosion damage occurs, it's impossible to replace the damaged section individually; the entire shell must be replaced. This not only incurs high material costs but also requires extensive manpower for removal and reinstallation, consuming significant time and resources. This significantly increases ship maintenance costs and reduces the economic viability of ship operations.

[0006] Existing liquid level detection mechanisms are often fixed to the tank, making them susceptible to interference from the ship's swaying. This makes accurate measurement difficult when the ship is swaying. When the ship is swaying, the LNG level in the tank fluctuates dramatically, making it impossible to guarantee measurement accuracy and, consequently, preventing accurate, real-time level measurement. Furthermore, while the ship is moving, the LNG sways wildly, potentially affecting the operation of the submersible pump. This makes it difficult for the pump's extraction end to consistently maintain the lowest liquid level, leading to cavitation and reducing the pump's service life and LNG delivery efficiency. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a fuel storage tank for a dual-fuel powered ship.

[0008] The technical solutions adopted to solve the above technical problems are:

[0009] A fuel storage tank for a dual-fuel powered ship, comprising a mounting assembly connected to an active compensation assembly for actively compensating when the ship rolls side to side; the mounting assembly connected to a modular outer tank assembly; the outer tank assembly connected to an inner tank assembly for storing liquefied natural gas (LNG); and the inner tank assembly connected to an injection assembly for filling and extracting liquefied natural gas (LNG).

[0010] The outer tank assembly includes a combined tank assembly and a closing assembly. The combined tank assembly is connected to the closing assembly. The closing assembly is connected to the mounting assembly, the inner tank assembly, and the pumping assembly. Two groups of closing assemblies are symmetrically arranged on the left and right.

[0011] Through the above technical solution, the active compensation component actively compensates for the left and right shaking generated during the ship's navigation, which helps to maintain the uniformity of liquefied natural gas LNG, prevent stratification and rolling, and ensure the quality and performance of liquefied natural gas LNG. By setting up a modular outer tank assembly, the outer tank assembly can be replaced separately in the event of seawater corrosion, and there is no need for replacement, which saves overall maintenance costs.

[0012] Furthermore, the mounting assembly includes a first mounting base plate, a mounting vertical plate and a mounting frame. The mounting vertical plate is symmetrically arranged with two groups and is fixedly installed on the left and right ends of the upper end surface of the first mounting base plate. The mounting frame is symmetrically arranged with two groups. The outer sides of the mounting frames at both ends are detachably connected to the mounting vertical plates at both ends by screws, and the mounting frames are connected to the closed assembly.

[0013] Furthermore, the active compensation component includes a second mounting base and hydraulic cylinders, and the hydraulic cylinders are arranged in multiple groups at equal intervals on the left and right and in two rows symmetrically arranged front to back. The lower ends of the multiple groups of hydraulic cylinders are hinged to the multiple groups of mounting ears on the second mounting base, and the output ends of the multiple groups of hydraulic cylinders are respectively hinged to the multiple groups of mounting ears at the lower end of the first mounting base.

[0014] Through the above technical solution, when the ship rocks, the hydraulic cylinder on the side opposite to the rocking direction extends to keep the outer tank assembly and the inner tank assembly always level, thereby reducing the rocking of the liquefied natural gas LNG.

[0015] Furthermore, the combined tank body assembly includes splicing plates, card strips, card slots and arc-shaped plates. The splicing plates are arranged in a circular array in multiple groups. Card strips are fixedly installed on the right sides of the multiple groups of splicing plates. Card slots are opened on the left sides of the multiple groups of splicing plates. The two groups of splicing plates are combined by clamping the card slots with the card strips. The multiple groups of splicing plates are combined to form a circular tube by clamping the card slots with the card strips. Two groups of arc-shaped plates are fixedly installed on each group of splicing plates and are respectively located at the two ends of the outer wall of the splicing plates. The splicing plates are connected to the inner tank body assembly.

[0016] Through the above technical solution, multiple groups of splicing plates are connected and assembled into a circular tube through the card slots and card strips, so that the splicing plates can be replaced individually when corroded, reducing maintenance costs.

[0017] Furthermore, the closing assembly includes a closing cover plate, a pin rod and a sealing gasket. The inner ends of the two groups of mounting frames are respectively fixedly connected to the outer end faces of the two groups of closing cover plates. A third pipe is fixedly installed on the closing cover plate located on the left side. Multiple groups of pin rods are fixedly installed in a circular array on the inner end face of the closing cover plate. The pin rods are connected to the inner tank body assembly. The sealing gaskets are respectively located between the arc plates and the closing cover plates. The two groups of closing cover plates are respectively detachably connected to the arc plates at both ends of the multiple groups of splicing plates by screws. The inner side wall of the sealing gasket is in contact with the outer end faces of the multiple groups of arc plates, and the outer side wall of the sealing gasket is in contact with the inner end face of the closing cover plate.

[0018] Through the above technical solution, the circular tube formed by the multiple sets of spliced plates is sealed by combining the closed cover plate, the sealing gasket and the multiple sets of arc plates, and the joints are sealed with sealant to form the outer tank body.

[0019] Furthermore, the inner tank assembly includes a tank body and a connecting frame assembly, the tank body is connected to the pumping assembly, the connecting frame assembly is connected to the pin rod and the splicing plate, and the connecting frame assembly is symmetrically arranged in two groups.

[0020] Furthermore, the connecting frame assembly includes a first mounting plate and a socket, the outer side wall of the first mounting plate is fitted and connected to the inner side walls of multiple groups of splicing plates, and multiple groups of sockets are arranged in a circular array and fixedly mounted on the first mounting plate. The multiple groups of sockets are respectively used in conjunction with multiple groups of pin rods, and the inner ends of the multiple groups of sockets at both ends are respectively fixedly connected to the two end surfaces of the tank body.

[0021] Through the above technical solution, the tank body is supported by the first mounting plate, and the tank body is limited by the combination of the sleeve and the pin rod. The front end of the pin rod is fully inserted into the inner end of the sleeve and contacts it, so that the tank body will not move.

[0022] Furthermore, the pumping assembly includes a first pipe, a baffle, a second pipe, a first hydraulic-electric combination slip ring, a second hydraulic-electric combination slip ring, a liquid slip ring, an electric slip ring, a circular orifice plate and an injection hole. The first pipe is rotatably connected to the closed cover plate and the tank body. The baffle is fixedly installed on the inner wall of the first pipe and is located on the left side of the electric slip ring. The first hydraulic-electric combination slip ring, the second hydraulic-electric combination slip ring, the liquid slip ring, the electric slip ring and the circular orifice plate are all fixedly installed on the outer wall of the first pipe, wherein the circular orifice plate is located in the middle of the first pipe, the first hydraulic-electric combination slip ring is located on the right side of the circular orifice plate, and the electric slip ring is located on the left side of the circular orifice plate. Located on the left side of the circular orifice plate, the second hydraulic-electric combination slip ring is located at the right end of the first pipeline, the liquid slip ring is located at the left end of the first pipeline, the second pipeline is arranged at the inner end of the first pipeline, the left side of the second pipeline is connected to the input end of the electric slip ring, the second pipeline is connected to the electrical input end of the first hydraulic-electric combination slip ring, the right side of the second pipeline is connected to the electrical output end of the second hydraulic-electric combination slip ring, the liquid output end of the first hydraulic-electric combination slip ring is connected to the right end position of the baffle on the first pipeline, the liquid input end of the second hydraulic-electric combination slip ring is connected to the left end of the first pipeline, and an injection hole is provided at the left end position of the baffle on the first pipeline.

[0023] Furthermore, two groups of spiral blades are fixedly installed symmetrically on the outer side wall of the first pipe, two groups of second mounting plates are fixedly installed symmetrically on the upper and lower sides of the rotating end of the electric slip ring, and a group of pressure sensors are fixedly installed on the outer ends of the left walls of the two groups of second mounting plates. The electrical output end of the electric slip ring is electrically connected to the two groups of pressure sensors, and a counterweight is fixedly installed on the right side wall of the second mounting plate located at the lower end. A submersible pump is fixedly installed on the outer side wall of the rotating end of the first hydraulic-electric combination slip ring, and the power input end of the submersible pump is electrically connected to the electrical output end of the first hydraulic-electric combination slip ring, and the liquid output end of the submersible pump is connected to the liquid access end of the first hydraulic-electric combination slip ring.

[0024] Through the above technical solution, the power supply is connected through the electrical input end of the second hydraulic-electric combination slip ring, and the electrical output end of the second hydraulic-electric combination slip ring passes through the second pipeline through the cable and is connected to the first hydraulic-electric combination slip ring and the electric slip ring. The electrical output end of the first hydraulic-electric combination slip ring transmits electricity to the submersible pump for power supply, and the electrical output end of the electric slip ring transmits electricity to the pressure sensor for power supply. The liquefied natural gas LNG is extracted by the submersible pump and transported to the second hydraulic-electric combination slip ring through the left end of the first pipeline separated by the baffle. The liquefied natural gas LNG is transported out through the second hydraulic-electric combination slip ring, and the liquefied natural gas LNG level is detected by the pressure difference between the two groups of pressure sensors. When the compensation of the active compensation component cooperates with the deadweight of the submersible pump, the submersible pump will rotate with the rotating end of the first hydraulic-electric combination slip ring to make the extraction end of the submersible pump It is always located at the bottom of the liquid level, and will not produce cavitation caused by the swaying of the ship. At the same time, the gravity of the counterweight drives the second mounting plate to keep the two groups of pressure sensors always at the bottom of the liquid level, and the other group of pressure sensors at the top, so as to realize the real-time and accurate measurement of the liquid level without being affected by the swaying of the ship. At the same time, the inner end of the tank body is separated by a circular orifice plate, and the blades of the two groups of spiral blades divide the liquefied natural gas LNG into multiple groups of areas. When the liquefied natural gas LNG sways, the two groups of spiral blades will be driven to rotate in opposite directions, and the rotation of the first pipeline and the tank body is a damped rotation. The liquefied natural gas LNG is divided into multiple groups of areas by the spiral blades, and the damping effect and the opposite forces of the two groups of spiral blades can greatly reduce the fluctuation of the swaying of the liquefied natural gas LNG.

[0025] The beneficial effects of the present invention are as follows: (1) The active compensation component actively compensates for the left and right shaking generated during the ship's travel, thereby helping to maintain the uniformity of liquefied natural gas (LNG), prevent stratification and rolling, and ensure the quality and performance of liquefied natural gas (LNG); (2) By setting a combined outer tank assembly, the outer tank assembly can be replaced separately when it is corroded by seawater, and the overall maintenance cost is saved without replacement; (3) The liquefied natural gas (LNG) liquid level is detected by the pressure difference between the two groups of pressure sensors. When the active compensation component is compensated and the weight of the submersible pump is combined, the submersible pump will rotate with the rotating end of the first hydraulic-electric combination slip ring so that the extraction end of the submersible pump is always at the bottom of the liquid level, and no damage caused by the ship will occur. The cavitation phenomenon caused by sloshing is eliminated. At the same time, the gravity of the counterweight drives the second mounting plate to keep the two groups of pressure sensors at the bottom of the liquid level and the other group of pressure sensors at the top, realizing real-time and accurate measurement of the liquid level without being affected by the sloshing of the ship. At the same time, the inner side of the tank body is separated by a circular orifice plate, and the blades of the two groups of spiral blades divide the liquefied natural gas LNG into multiple groups of areas. When the liquefied natural gas LNG sloshes, the two groups of spiral blades will drive the opposite rotation, and the rotation of the first pipeline and the tank body is a damped rotation. The spiral blades divide the liquefied natural gas LNG into multiple groups of areas, and the damping effect and the opposite force of the two groups of spiral blades can greatly reduce the fluctuation of the sloshing of the liquefied natural gas LNG. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a perspective view of a fuel storage tank for a dual-fuel powered ship according to the present invention;

[0027] Figure 2 This is a front view of a fuel storage tank for a dual-fuel powered ship according to the present invention;

[0028] Figure 3 This is a left side view of a fuel storage tank for a dual-fuel powered ship according to the present invention;

[0029] Figure 4 To follow Figure 3 A three-dimensional cross-sectional view in the AA direction;

[0030] Figure 5 To follow Figure 3 A three-dimensional cross-sectional view in the BB direction;

[0031] Figure 6 A schematic diagram of the splicing of two sets of splicing plates, card strips and card slots;

[0032] Figure 7 for Figure 4 Enlarged view of point C in the middle;

[0033] Figure 8 for Figure 4Enlarged view of point D in the middle.

[0034] Reference numerals:

[0035] 1. Mounting assembly; 11. First mounting base; 12. Mounting stand; 13. Mounting frame; 2. Active compensation assembly; 21. Second mounting base; 22. Hydraulic cylinder; 3. Outer tank assembly; 31. Combined tank assembly; 311. Splicing plate; 312. Clamping strip; 313. Clamping slot; 314. Curved plate; 32. Closing assembly; 321. Closing cover; 322. Pin; 323. Sealing gasket; 4. Inner tank assembly; 41. Tank; 42. Connecting frame assembly; 421. First mounting plate; 422. Plug sleeve; 5. Pumping assembly; 51. First pipeline; 52. Baffle; 53. Second pipeline; 54. First hydraulic-electric combination slip ring; 55. Second hydraulic-electric combination slip ring; 56. Liquid slip ring; 57. Electric slip ring; 58. Circular orifice plate; 59. Injection hole; 6. Third pipeline; 7. Spiral blade; 8. Second mounting plate; 9. Pressure sensor; 10. Counterweight; 200. Submersible pump. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0038] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figures 1-8 A fuel storage tank for a dual-fuel powered ship includes a mounting assembly 1, the mounting assembly 1 being connected to an active compensation assembly 2 for actively compensating when the ship rolls left and right, the mounting assembly 1 being connected to a modular outer tank assembly 3, the outer tank assembly 3 being connected to an inner tank assembly 4 for storing liquefied natural gas (LNG), and the inner tank assembly 4 being connected to an extraction assembly 5 for filling and extracting liquefied natural gas (LNG);

[0039] The outer tank assembly 3 includes a combined tank assembly 31 and a closing assembly 32. The combined tank assembly 31 is connected to the closing assembly 32. The closing assembly 32 is connected to the mounting assembly 1, the inner tank assembly 4, and the pumping assembly 5. Two groups of closing assemblies 32 are symmetrically arranged on the left and right.

[0040] The mounting assembly 1 includes a first mounting base plate 11, a mounting vertical plate 12 and a mounting frame 13. The mounting vertical plates 12 are symmetrically arranged in two groups and are respectively fixedly installed on the left and right ends of the upper end surface of the first mounting base plate 11. The mounting frames 13 are symmetrically arranged in two groups. The outer sides of the mounting frames 13 at both ends are detachably connected to the mounting vertical plates 12 at both ends by screws. The mounting frames 13 are connected to the closing assembly 32.

[0041] The active compensation component 2 includes a second mounting base 21 and a hydraulic cylinder 22. The hydraulic cylinders 22 are arranged in multiple groups with equal intervals on the left and right and in two rows symmetrically arranged in the front and back. The lower ends of the multiple groups of hydraulic cylinders 22 are hinged to the multiple groups of mounting ears on the second mounting base 21, and the output ends of the multiple groups of hydraulic cylinders 22 are respectively hinged to the multiple groups of mounting ears at the lower end of the first mounting base 11.

[0042] The combined tank body assembly 31 includes a splicing plate 311, a clamping strip 312, a clamping groove 313 and an arc plate 314. The splicing plates 311 are arranged in a circular array in multiple groups. The right side surfaces of the multiple groups of splicing plates 311 are fixedly installed with a clamping strip 312, and the left side surfaces of the multiple groups of splicing plates 311 are provided with a clamping groove 313. The two groups of splicing plates 311 are combined by clamping the clamping strip 312 with the clamping groove 313. The multiple groups of splicing plates 311 are clamped and combined to form a circular tube through the clamping groove 313 and the clamping strip 312. Two groups of arc plates 314 are fixedly installed on each group of splicing plates 311 and are respectively located at the two ends of the outer wall of the splicing plates 311. The splicing plates 311 are connected to the inner tank body assembly 4.

[0043] The closing assembly 32 includes a closing cover plate 321, a pin rod 322 and a sealing gasket 323. The inner ends of the two sets of mounting frames 13 are fixedly connected to the outer end surfaces of the two sets of closing cover plates 321 respectively. The third pipe 6 is fixedly installed on the closing cover plate 321 on the left side. A plurality of sets of pin rods 322 are fixedly installed in a circumferential array on the inner end surface of the closing cover plate 321. The pin rods 322 are connected to the inner tank body assembly 4. The sealing gaskets 323 are respectively located between the arc plates 314 and the closing cover plate 321. The two sets of closing cover plates 321 are respectively detachably connected to the arc plates 314 at both ends of the multiple sets of splicing plates 311 by screws. The inner side wall of the sealing gasket 323 is in contact with the outer end surfaces of the multiple sets of arc plates 314, and the outer side wall of the sealing gasket 323 is in contact with the inner end surface of the closing cover plate 321.

[0044] The inner tank assembly 4 includes a tank body 41 and a connecting frame assembly 42. The tank body 41 is connected to the pumping assembly 5. The connecting frame assembly 42 is connected to the pin rod 322 and the splicing plate 311. Two groups of connecting frame assemblies 42 are symmetrically arranged on the left and right.

[0045] The connecting frame assembly 42 includes a first mounting plate 421 and a socket 422. The outer wall of the first mounting plate 421 is fitted and connected to the inner wall of the multiple groups of splicing plates 311. The sockets 422 are arranged in a circular array and multiple groups are fixedly installed on the first mounting plate 421. The multiple groups of sockets 422 are respectively used in conjunction with the multiple groups of pins 322. The inner ends of the multiple groups of sockets 422 at both ends are respectively fixedly connected to the two end surfaces of the tank body 41.

[0046] The pumping assembly 5 includes a first pipe 51, a baffle 52, a second pipe 53, a first hydraulic-electric combination slip ring 54, a second hydraulic-electric combination slip ring 55, a liquid slip ring 56, an electric slip ring 57, a circular orifice plate 58 and an injection hole 59. The first pipe 51 is rotatably connected to the closed cover plate 321 and the tank body 41. The baffle 52 is fixedly installed on the inner wall of the first pipe 51 and the baffle 52 is located on the left side of the electric slip ring 57. The first hydraulic-electric combination slip ring 54, the second hydraulic-electric combination slip ring 55, the liquid slip ring 56, the electric slip ring 57 and the circular orifice plate 58 are all fixedly installed on the outer wall of the first pipe 51, wherein the circular orifice plate 58 is located in the middle of the first pipe 51, the first hydraulic-electric combination slip ring 54 is located on the right side of the circular orifice plate 58, and the electric slip ring 57 is located on the left side of the circular orifice plate 58, the second hydraulic-electric combination slip ring 55 is located at the right end of the first pipe 51, the liquid slip ring 56 is located at the left end of the first pipe 51, and the second pipe 53 is arranged at the inner end of the first pipe 51. The left side of the second pipe 53 is connected to the input end of the slip ring 57, the second pipe 53 is connected to the electrical input end of the first hydraulic-electric combination slip ring 54, and the right side of the second pipe 53 is connected to the electrical output end of the second hydraulic-electric combination slip ring 55. The liquid output end of the first hydraulic-electric combination slip ring 54 is connected to the right end position of the baffle 52 on the first pipe 51, and the liquid input end of the second hydraulic-electric combination slip ring 55 is connected to the left end of the first pipe 51. An injection hole 59 is opened at the left end position of the baffle 52 on the first pipe 51.

[0047] Two groups of spiral blades 7 are fixedly installed symmetrically on the outer side wall of the first pipe 51, and two groups of second mounting plates 8 are fixedly installed symmetrically on the upper and lower rotating ends of the electric slip ring 57. A group of pressure sensors 9 are fixedly installed on the outer ends of the left walls of the two groups of second mounting plates 8. The electrical output end of the electric slip ring 57 is electrically connected to the two groups of pressure sensors 9. A counterweight block 10 is fixedly installed on the right side wall of the second mounting plate 8 located at the lower end. A submersible pump 200 is fixedly installed on the outer side wall of the rotating end of the first liquid-electric combination slip ring 54. The power input end of the submersible pump 200 is electrically connected to the electrical output end of the first liquid-electric combination slip ring 54, and the liquid output end of the submersible pump 200 is connected to the liquid access end of the first liquid-electric combination slip ring 54.

[0048] When the present invention is used, liquefied natural gas (LNG) is transmitted to the left end of the baffle 52 in the first pipeline 51 through the liquid slip ring 56, and liquefied natural gas (LNG) is injected into the tank body 41 through the injection hole 59. The power supply is connected to the power supply through the electrical input end of the second hydraulic-electric combination slip ring 55. The electrical output end of the second hydraulic-electric combination slip ring 55 is connected to the first hydraulic-electric combination slip ring 54 and the electric slip ring 57 through a cable through the second pipeline 53. The electrical output end of the first hydraulic-electric combination slip ring 54 transmits electricity to the submersible pump 200 for power supply, and the electrical output end of the electric slip ring 57 transmits electricity to the pressure sensor 9 for power supply. The submersible pump 200 extracts liquefied natural gas (LNG) and transmits it to the second hydraulic-electric combination slip ring 55 through the left end of the first pipeline 51 separated by the baffle 52. The liquefied natural gas (LNG) is then transmitted out through the second hydraulic-electric combination slip ring 55. The liquefied natural gas (LNG) liquid level is detected by the pressure difference between the two sets of pressure sensors 9. The space between the inner tank assembly 4 and the outer tank assembly 3 is evacuated through the third pipeline 6 for thermal insulation.

[0049] When the hull sways from side to side, the hydraulic cylinder 22 on the side opposite to the swaying direction extends to keep the outer tank assembly 3 and the inner tank assembly 4 level at all times, reducing the swaying of the LNG. When the hull sways back and forth, the swaying of the LNG drives the two sets of spiral blades 7 to rotate in opposite directions. The rotation of the first pipe 51 and the tank 41 is damped. The spiral blades 7 divide the LNG into multiple areas, and the damping effect, as well as the opposing forces of the two sets of spiral blades 7, greatly reduces the fluctuations of the LNG swaying back and forth. (Ship shapes are typically slender, with their longitudinal length much greater than their transverse width. This shape makes the ship relatively adaptable to waves in the longitudinal direction, allowing it to rise and fall relatively smoothly in the fore-and-aft direction of the waves, reducing the strong shaking caused by the fore-and-aft fluctuations of the waves.)

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fuel storage tank for a dual-fuel powered ship, comprising a mounting assembly (1), characterized in that: The mounting assembly (1) is connected to an active compensation assembly (2) for actively compensating when the ship sways left and right, the mounting assembly (1) is connected to a combined outer tank assembly (3), the outer tank assembly (3) is connected to an inner tank assembly (4) for storing liquefied natural gas (LNG), and the inner tank assembly (4) is connected to an injection assembly (5) for filling and extracting liquefied natural gas (LNG); The outer tank assembly (3) comprises a combined tank assembly (31) and a closing assembly (32), wherein the combined tank assembly (31) is connected to the closing assembly (32), and the closing assembly (32) is connected to the mounting assembly (1), the inner tank assembly (4), and the pumping assembly (5), and the closing assembly (32) is symmetrically arranged in two groups. The active compensation component (2) includes a second mounting base (21) and hydraulic cylinders (22), wherein the hydraulic cylinders (22) are arranged in multiple groups at equal intervals on the left and right and in two rows symmetrically arranged front to back, the lower ends of the multiple groups of hydraulic cylinders (22) are hinged to the multiple groups of mounting ears on the second mounting base (21), and the output ends of the multiple groups of hydraulic cylinders (22) are respectively hinged to the multiple groups of mounting ears at the lower end of the first mounting base (11); The pumping assembly (5) includes a first pipe (51), a baffle (52), a second pipe (53), a first hydraulic-electric combination slip ring (54), a second hydraulic-electric combination slip ring (55), a liquid slip ring (56), an electric slip ring (57), a circular orifice plate (58) and an injection hole (59), wherein the first pipe (51) is rotatably connected to the closing cover plate (321) and the tank body (41), the baffle (52) is fixedly mounted on the inner wall of the first pipe (51) and the baffle (52) is located on the left side of the electric slip ring (57), the first hydraulic-electric combination slip ring (54), the second hydraulic-electric combination slip ring (55), the liquid slip ring (56), the electric slip ring (57) and the circular orifice plate (58) are all fixedly mounted on the outer wall of the first pipe (51), wherein the circular orifice plate (58) is located in the middle of the first pipe (51), and the first hydraulic-electric combination slip ring (54) is located on the left side of the circular orifice plate (58) ), the electric slip ring (57) is located on the left side of the circular orifice plate (58), the second hydraulic-electric combination slip ring (55) is located at the right end of the first pipe (51), the liquid slip ring (56) is located at the left end of the first pipe (51), the second pipe (53) is arranged at the inner end of the first pipe (51), the left side of the second pipe (53) is connected to the input end of the electric slip ring (57), the second pipe (53) is connected to the electric input end of the first hydraulic-electric combination slip ring (54), the right side of the second pipe (53) is connected to the electric output end of the second hydraulic-electric combination slip ring (55), the liquid output end of the first hydraulic-electric combination slip ring (54) is connected to the right end position of the baffle (52) on the first pipe (51), the liquid input end of the second hydraulic-electric combination slip ring (55) is connected to the left end of the first pipe (51), and the left end position of the baffle (52) on the first pipe (51) is provided with an injection hole (59); Two groups of spiral blades (7) are fixedly installed symmetrically on the outer wall of the first pipe (51), two groups of second mounting plates (8) are fixedly installed symmetrically on the upper and lower sides of the rotating end of the electric slip ring (57), and a group of pressure sensors (9) are fixedly installed on the outer ends of the left walls of the two groups of second mounting plates (8). The electrical output end of the electric slip ring (57) is electrically connected to the two groups of pressure sensors (9). A counterweight (10) is fixedly installed on the right wall of the second mounting plate (8) at the lower end. A submersible pump (200) is fixedly installed on the outer wall of the rotating end of the first hydraulic-electric combination slip ring (54), the power input end of the submersible pump (200) is electrically connected to the electrical output end of the first hydraulic-electric combination slip ring (54), and the liquid output end of the submersible pump (200) is communicated with the liquid access end of the first hydraulic-electric combination slip ring (54).

2. The fuel storage tank for dual-fuel powered ships according to claim 1, characterized in that: The mounting assembly (1) comprises a first mounting base plate (11), a mounting vertical plate (12) and a mounting frame (13); the mounting vertical plate (12) is symmetrically provided with two groups fixedly mounted on the left and right ends of the upper end surface of the first mounting base plate (11); the mounting frame (13) is symmetrically provided with two groups; the outer sides of the mounting frames (13) at the two ends are detachably connected to the mounting vertical plates (12) at the two ends by screws, respectively; the mounting frames (13) are connected to the closing assembly (32).

3. The fuel storage tank for a dual-fuel powered ship according to claim 2, characterized in that: The combined tank body assembly (31) comprises a splicing plate (311), a clamping strip (312), a clamping slot (313) and an arc-shaped plate (314). The splicing plates (311) are arranged in a circumferential array in a plurality of groups. The right side surfaces of the plurality of groups of splicing plates (311) are fixedly mounted with a clamping strip (312). The left side surfaces of the plurality of groups of splicing plates (311) are provided with a clamping slot (313). Two groups of splicing plates (311) are combined by clamping the clamping slot (313) and the clamping strip (312). The plurality of groups of splicing plates (311) are clamped and combined by clamping the clamping slot (313) and the clamping strip (312) to form a circular tube. Two groups of arc-shaped plates (314) are fixedly mounted on each group of splicing plates (311) and are respectively located at two ends of the outer side wall of the splicing plate (311). The splicing plate (311) is connected to the inner tank body assembly (4).

4. The fuel storage tank for a dual-fuel powered ship according to claim 3, characterized in that: The closing assembly (32) includes a closing cover plate (321), a pin rod (322) and a sealing gasket (323). The inner ends of the two sets of mounting frames (13) are fixedly connected to the outer end surfaces of the two sets of closing cover plates (321). A third pipe (6) is fixedly installed on the closing cover plate (321) on the left side. A plurality of pin rods (322) are fixedly installed in a circumferential array on the inner end surface of the closing cover plate (321). The pin rods (322) are connected to the inner tank body. The sealing gasket (323) is respectively located between the arc-shaped plate (314) and the closed cover plate (321). The two groups of closed cover plates (321) are respectively detachably connected to the arc-shaped plates (314) at both ends of the multiple groups of splicing plates (311) by screws. The inner side wall of the sealing gasket (323) is in contact with the outer end surface of the multiple groups of arc-shaped plates (314), and the outer side wall of the sealing gasket (323) is in contact with the inner end surface of the closed cover plate (321).

5. The fuel storage tank for a dual-fuel powered ship according to claim 1, characterized in that: The inner tank assembly (4) comprises a tank body (41) and a connecting frame assembly (42), wherein the tank body (41) is connected to the pumping assembly (5), and the connecting frame assembly (42) is connected to the pin rod (322) and the splicing plate (311), and two groups of the connecting frame assemblies (42) are symmetrically arranged on the left and right.

6. The fuel storage tank for a dual-fuel powered ship according to claim 5, characterized in that: The connecting frame assembly (42) includes a first mounting plate (421) and a plug sleeve (422). The outer side wall of the first mounting plate (421) is fitted and connected to the inner side walls of the plurality of splicing plates (311). The plug sleeves (422) are arranged in a circular array and are fixedly mounted on the first mounting plate (421). The plurality of plug sleeves (422) are respectively connected to the plurality of pin rods (322) for plugging. The inner ends of the plurality of plug sleeves (422) at both ends are respectively fixedly connected to the two end surfaces of the tank body (41).

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