Combined fixing device and method for marine LNG fuel C-shaped storage tank

Abstract

The invention discloses a combined fixing device of a marine LNG fuel C-shaped storage tank, belongs to the technical field of ship manufacturing, and solves the problem that an existing marine LNG fuel C-shaped storage tank is easy to loosen. The anti-explosion ship comprises a combined storage tank, an anti-explosion box and a plurality of ship body bases, the anti-explosion box is arranged at one end of the combined storage tank in a sleeving mode, and the anti-explosion box and the combined storage tank are fixed in a welded and sealed mode; a plurality of supporting legs are arranged at the bottom of the combined storage tank and are in lap joint with a plurality of ship body bases in a one-to-one correspondence mode, and each supporting leg is fixedly connected with the corresponding ship body base through a bolt and nut assembly. A glass fiber reinforced plastic layer and an epoxy resin layer are sequentially arranged between each supporting leg and the ship body base from top to bottom. According to the combined fixing device, the mounting stability of the C-shaped LNG fuel storage tank for the ship can be improved. The invention further discloses a combined fixing method of the marine LNG fuel C-shaped storage tank. According to the method, rapid, accurate and stable installation can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and more specifically, to a combined fixing device and method for a C-type storage tank of LNG fuel for a ship. Background Art

[0002] Traditional ships are generally driven by diesel engines. With the continuous advancement of new energy technologies, gas engines are gradually being used in ships, which can effectively reduce navigation costs. Ships are driven by gas engines, which inevitably requires the configuration of large-volume marine LNG fuel C-type storage tanks in the ship to store liquid gas. Existing marine LNG fuel C-type storage tanks are fixed. Generally, multiple support legs are welded at the bottom of the marine LNG fuel C-type storage tanks, and then multiple hull bases are welded on the deck of the ship. The marine LNG fuel C-type storage tank is hoisted onto the hull base, and then the support legs are connected and fixed to the hull base with fastening bolts to achieve the fixed installation of the marine LNG fuel C-type storage tank.

[0003] However, ship-based LNG fuel type C storage tanks are usually large in size, have a large installation span, and the ship deck has a certain curvature. There are errors in the welding of the hull base, which leads to the ship-based LNG fuel type C storage tanks being easily deformed when the fastening bolts tighten the support legs and the hull base after the ship-based LNG fuel storage tanks are installed and fixed, and there is a risk of explosion. At the same time, the welding points of the support legs or the hull base are also easily loosened due to stress, resulting in unstable installation of the ship-based LNG fuel storage tanks and a short service life.

[0004] Therefore, there is an urgent need to develop and design a combined fixing device and method for a marine LNG fuel C-type storage tank. Summary of the invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. One purpose of the present invention is to provide a combined fixing device for a type C storage tank for ship LNG fuel, which can improve the installation stability of the type C storage tank for ship LNG fuel and reduce the risk of explosion.

[0006] The second object of the present invention is to provide a combined fixing method for a C-type storage tank for LNG fuel used on board a ship, so as to achieve fast, accurate and stable installation.

[0007] In order to achieve the above-mentioned purpose one, the present invention provides a combined fixing device for a ship-used LNG fuel C-type storage tank, comprising a combined storage tank, an explosion-proof box and a plurality of hull bases, wherein the explosion-proof box is sleeved at one end of the combined storage tank, and the explosion-proof box and the combined storage tank are welded and sealed and fixed, the air inlet pipe and the air outlet pipe of the combined storage tank are both located at one end of the combined storage tank in the explosion-proof box, and the air inlet pipe and the air outlet pipe of the combined storage tank both penetrate the explosion-proof box and are connected with a connecting flange; a plurality of supporting feet are provided at the bottom of the combined storage tank, and the plurality of hull bases are fixed to the ship deck by welding On the top, the multiple supporting feet are overlapped on the multiple hull bases in a one-to-one manner, and each of the supporting feet is connected and fixed to the hull base by a bolt and nut assembly, and a fiberglass reinforced plastic and epoxy resin layer arranged in sequence from top to bottom is provided between each of the supporting feet and the hull base; the bottom of the explosion-proof box is provided with a plurality of upper guide sleeves, and the deck of the ship is also provided with a plurality of lower guide sleeves corresponding to the positions of the upper guide sleeves in a one-to-one manner, and a compression spring is provided in the lower guide sleeve, and a guide column is movably inserted between the upper guide sleeve and the lower guide sleeve, and the guide column is made of low-temperature resistant steel.

[0008] As a further improvement, the guide column is cylindrical, the upper guide sleeve and the lower guide sleeve are both sleeves with cylindrical inner cavities, the guide column and the upper guide sleeve and the lower guide sleeve are clearance-fitted, and the clearance between the guide column and the upper guide sleeve and the lower guide sleeve is 2-5mm.

[0009] Furthermore, arc-shaped supporting plates are provided at the bottom of both ends of the combined storage tank, and two supporting legs are symmetrically welded at the bottom of each of the arc-shaped supporting plates.

[0010] Furthermore, the combined storage tank includes an inner tank and an outer tank, the outer tank is sleeved on the periphery of the inner tank, an insulating cavity is provided between the inner tank and the outer tank, a plurality of support columns are provided in the insulating cavity, one end of each of the support columns is welded and fixedly connected to the inner wall of the outer tank, and the other end is attached to the outer wall of the inner tank.

[0011] Furthermore, the outer wall of the inner tank is also wrapped with a heat insulation layer.

[0012] Furthermore, the outer tank comprises a left tank body, a middle tank body and a right tank body which are arranged separately, and the left tank body, the middle tank body and the right tank body are fixedly connected by welding.

[0013] Furthermore, connecting rings are provided between the left tank body and the middle tank body, and between the middle tank body and the right tank body. The connecting rings include an inner ring and an outer ring. The inner ring and the outer ring are connected and fixed by multiple connecting plates. The inner ring is sleeved on the outer wall of the inner tank. The left tank body, the middle tank body and the right tank body are all inserted into the bottom surface of the outer ring, and the left tank body, the middle tank body and the right tank body are all welded and fixedly connected to the outer ring.

[0014] Furthermore, the supporting feet are located directly below the connecting ring.

[0015] In order to achieve the above-mentioned second objective, the present invention provides a combined fixing method of a C-type storage tank for marine LNG fuel, including the above-mentioned combined fixing device for the C-type storage tank for marine LNG fuel, and the method comprises the following steps:

[0016] S1. Assemble and weld to obtain a combined storage tank, weld support legs at the bottom of the combined storage tank, and paste fiberglass at the bottom of the support legs;

[0017] S2. Welding the hull base and the lower guide sleeve on the ship deck respectively, and placing the compression spring and the guide column in the lower guide sleeve in sequence;

[0018] S3. Lift the combined storage tank to the top of the hull base and slowly lower it until the support feet move to 5-10mm above the hull base;

[0019] S4. Inject epoxy resin material into the gap between the FRP and the hull base. After the epoxy resin material solidifies, an epoxy resin layer is formed between the FRP and the hull base. Loosen the hoisting rope of the modular storage tank.

[0020] S5. Use bolt and nut assemblies to connect and fix the support foot to the hull base;

[0021] S6. Put the explosion-proof box on one end of the combined storage tank. After the upper guide sleeve is put on the top of the guide column, weld the connection between the explosion-proof box and the combined storage tank to fix the connection.

[0022] Furthermore, the step S1 comprises the following steps:

[0023] S1.1. Weld and fix multiple support columns to the inner walls of the left tank, the middle tank, and the right tank respectively;

[0024] S1.2. Insert the middle tank into the middle position of the inner tank so that the support column corresponding to the middle tank fits on the outer wall of the inner tank;

[0025] S1.3: Insert the connecting ring into the two ends of the inner tank respectively until the connecting plate of the connecting ring contacts the two ends of the intermediate tank body, so that the inner ring of the connecting ring fits on the outer wall of the inner tank, and the two ends of the intermediate tank body fit on the bottom surface of the outer ring of the connecting ring;

[0026] S1.4: Insert the left tank body and the right tank body into the two ends of the inner tank respectively until the left tank body and the right tank body are in contact with the connecting plate of the connecting ring, so that the corresponding supporting columns of the left tank body and the right tank body are in contact with the outer wall of the inner tank, and one end of the left tank body and the right tank body are in contact with the outer ring bottom surface of the connecting ring;

[0027] S1.5: Weld and fix the left tank body, the middle tank body, the right tank body and the outer ring of the connecting ring to obtain a combined storage tank;

[0028] S1.6: Weld support feet to the bottom of the modular tank below the connection ring;

[0029] S1.7: Glue fiberglass to the bottom of the support legs.

[0030] Beneficial Effects

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The combined fixing device of the present invention supports the entire ship LNG fuel C-type storage tank by adding low-temperature resistant fiberglass between the supporting feet and the hull base, and pouring epoxy resin between the fiberglass and the hull base to form an epoxy resin layer, instead of the traditional method of directly fastening the supporting feet and the hull base with bolts and nuts. It can improve the installation stability of the ship LNG fuel C-type storage tank, and at the same time solve the problems of heat insulation, convenient height adjustment, and compensation for base manufacturing errors, thereby improving installation speed and safety.

[0033] 2. The combined fixing device of the present invention adopts a combined storage tank of inner and outer tanks, which can not only improve the structural strength of the storage tank and make it not easy to deform, but also during the installation process, there is no need to weld the inner tank, etc., to avoid deformation and damage of the inner tank due to welding. The construction can be carried out without changing the structure of the inner tank, effectively ensuring the structural strength of the inner tank. At the same time, the structure of the inner and outer tanks can avoid the problem of safety hazards caused by gas leakage directly entering the air, thereby reducing the risk of explosion.

[0034] 3. The combined fixing device of the present invention, by arranging an explosion-proof box at one end of the combined storage tank to cover the air inlet pipe, the air outlet pipe and their pipeline connections, can be arranged in the explosion-proof box. Electronic components such as gas detection sensors can be arranged in the explosion-proof box. Once gas leakage occurs at the air inlet pipe, the air outlet pipe and their pipeline connections, it is convenient to detect whether the gas is leaking, thereby further reducing the risk of explosion. At the same time, the explosion-proof box adopts the method of upper and lower guide sleeves and guide columns, which is convenient for installation and can also play a role of positioning support, thereby further improving the installation stability of the entire marine LNG fuel C-type storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at the center A;

[0037] Figure 3 for Figure 1 A schematic diagram of the structure enlarged at B in the middle;

[0038] Figure 4 It is a schematic diagram of the cross-sectional structure of the combined tank body of the present invention;

[0039] Figure 5 for Figure 4 A schematic diagram of the structure enlarged at C in the middle;

[0040] Figure 6 It is a schematic diagram of the structure of the outer tank in the present invention.

[0041] Among them: 1-combined tank body, 2-explosion-proof box, 3-hull base, 4-connecting flange, 5-support foot, 6-ship deck, 7-bolt and nut assembly, 8-glass fiber reinforced plastics, 9-epoxy resin layer, 10-upper guide sleeve, 11-lower guide sleeve, 12-compression spring, 13-guide column, 14-arc support plate, 101-inner tank, 102-outer tank, 103-insulation cavity, 104-support column, 105-insulation layer, 1021-left tank body, 1022-middle tank body, 1023-right tank body, 1024-inner ring, 1025-outer ring, 1026-connecting plate. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0043] See also Figure 1-6 A combined fixing device for a ship-used LNG fuel C-type storage tank of the present invention comprises a combined storage tank 1, an explosion-proof box 2 and a plurality of hull bases 3, wherein the explosion-proof box 2 is a box body with an opening at one end, the explosion-proof box 2 is sleeved on one end of the combined storage tank 1, and the explosion-proof box 2 and the combined storage tank 1 are welded and sealed to form a closed cavity in the explosion-proof box 2, the air inlet pipe and the air outlet pipe of the combined storage tank 1 are both located at one end of the combined storage tank 1 in the explosion-proof box 2, so that the explosion-proof box 2 wraps the air inlet pipe, the air outlet pipe and the pipe connection thereof, and the air inlet pipe and the air outlet pipe of the combined storage tank 1 both penetrate the explosion-proof box 2 and are connected with a connecting flange 4, so as to facilitate the connection with the pipeline of the engine, and components such as a gas detection sensor can be arranged in the explosion-proof box 2 to detect whether there is a gas leak in the explosion-proof box 2. A plurality of upper guide sleeves 10 are provided at the bottom of the explosion-proof box 2, and a plurality of lower guide sleeves 11 corresponding to the positions of the upper guide sleeves 10 are also provided on the ship deck 6. A compression spring 12 is provided in the lower guide sleeve 11, which is convenient for installing the explosion-proof box 2 and can also be used to push up the explosion-proof box 2 to play a certain supporting role. A guide column 13 is movably inserted between the upper guide sleeve 10 and the lower guide sleeve 11. The guide column 13 is made of low-temperature resistant steel, such as nickel steel, austenitic stainless steel, etc., to play a heat insulating role.

[0044] In this embodiment, an explosion-proof box 2 is provided at one end of the combined storage tank 1 to cover the air inlet pipe, the air outlet pipe and their pipe connections, and electronic components such as gas detection sensors can be provided in the explosion-proof box. Once gas leakage occurs at the air inlet pipe, the air outlet pipe and their pipe connections, it is convenient to detect whether the gas is leaking, thereby further reducing the risk of explosion. At the same time, the explosion-proof box adopts the method of upper and lower guide sleeves cooperating with guide columns 13, which is convenient for installation and can also play a role of positioning support, thereby further improving the installation stability of the entire ship LNG fuel C-type storage tank.

[0045] A plurality of supporting feet 5 are provided at the bottom of the combined storage tank 1, and a plurality of hull bases 3 are fixed on the ship deck 6 by welding. The plurality of supporting feet 5 are overlapped on the plurality of hull bases 3 one by one, and each supporting foot 5 is connected and fixed to the hull base 3 by a bolt and nut assembly 7, so as to realize the fixed connection between the supporting foot 5 and the hull base 3. A fiberglass reinforced plastic 8 and an epoxy resin layer 9 are provided between each supporting foot 5 and the hull base 3 in sequence from top to bottom, wherein the thickness of the epoxy resin layer 9 is 5-10 mm, and the fiberglass reinforced plastic 8 and the epoxy resin layer 9 both play a role of heat insulation, and the epoxy resin layer 9 is obtained by solidification after pouring, so as to make up for the installation gap.

[0046] In this embodiment, the entire ship LNG fuel C-type storage tank is supported by adding a low-temperature resistant fiberglass 8 between the supporting foot 5 and the hull base 3, and pouring epoxy resin between the fiberglass 8 and the hull base 3 to form an epoxy resin layer 9. Instead of the traditional method of directly fastening the supporting foot 5 and the hull base 3 with bolt and nut assemblies, the installation stability of the ship LNG fuel C-type storage tank can be improved, while solving the problems of heat insulation, convenient height adjustment, and compensation for base manufacturing errors, thereby improving the speed and safety of installation.

[0047] Preferably, the guide column 13 is cylindrical, and the upper guide sleeve 10 and the lower guide sleeve 11 are both sleeves with a cylindrical inner cavity. There is a clearance fit between the guide column 13 and the upper guide sleeve 10 and the lower guide sleeve 11, which facilitates the insertion of the guide column 13 into the upper guide sleeve 10 and the lower guide sleeve 11, and the clearance between the guide column 13 and the upper guide sleeve 10 and the lower guide sleeve 11 is 2-5mm. This clearance value not only facilitates the insertion of the guide column 13 into the two guide sleeves and improves the installation efficiency, but also in actual application, the slight vibration of the ship deck 6 will not cause impact on the explosion-proof box, thereby improving the stability of the explosion-proof box and the combined storage tank.

[0048] Preferably, arc-shaped support plates 14 are provided at the bottom of both ends of the combined storage tank 1, and two supporting feet 5 are symmetrically welded to the bottom of each arc-shaped support plate 14. The supporting feet 5 are connected to the combined storage tank 1 through the arc-shaped support plates 14 to increase the contact area and further improve the installation stability.

[0049] Preferably, the combined storage tank 1 includes an inner tank 101 and an outer tank 102, wherein the outer tank 102 is sleeved on the periphery of the inner tank 101, and an insulating cavity 103 is provided between the inner tank 101 and the outer tank 102, and a plurality of support columns 104 are provided in the insulating cavity 103 to improve the structural strength of the combined storage tank 1, and one end of each support column 104 is welded and fixedly connected to the inner wall of the outer tank 102, and the other end is attached to the outer wall of the inner tank 101, and the support column 104 and the inner tank 101 adopt a sliding contact mode, which facilitates the installation of the outer tank 102 on the periphery of the inner tank 101. Furthermore, the outer wall of the inner tank 101 is also wrapped with an insulating layer 105 to further improve the insulation effect and prevent the gasification of liquid gas.

[0050] Preferably, the outer tank 102 includes a left tank body 1021, a middle tank body 1022 and a right tank body 1023 which are separately arranged. The left tank body 1021, the middle tank body 1022 and the right tank body 1023 are fixedly connected by welding. The outer tank 102 adopts a three-section tank body structure, which is convenient for installation on the periphery of the inner tank 101. Furthermore, connecting rings are provided between the left tank body 1021 and the middle tank body 1022, and between the middle tank body 1022 and the right tank body 1023, and the connecting rings include an inner ring 1024 and an outer ring 1025, wherein the inner ring 1024 and the outer ring 1025 are connected and fixed by a plurality of connecting plates 1026, the inner ring 1024 is sleeved on the outer wall of the inner tank 101, and the left tank body 1021, the middle tank body 1022 and the right tank body 1023 are all inserted into the bottom surface of the outer ring 1025, and the left tank body 1021, the middle tank body 1022 and the right tank body 1023 are all welded and fixedly connected to the outer ring 1025. By setting the connection ring, not only can the left tank body 1021, the middle tank body 1022 and the right tank body 1023 be quickly positioned, thus improving the construction efficiency, but also the connection area between the left tank body 1021, the middle tank body 1022 and the right tank body 1023 can be increased, which facilitates welding and improves the connection reliability. Furthermore, the support foot 5 is located directly below the connection ring, and the arc-shaped support plate 14 is located directly below the connection ring, so that the stress point of the entire modular storage tank 1 is concentrated at the connection ring, and the connection ring is supported by multiple connection plates 1026, so that the structural strength is higher, thereby ensuring that the modular storage tank 1 does not deform.

[0051] In this embodiment, a combined storage tank of inner and outer tanks is used, which can not only improve the structural strength of the storage tank and make it less likely to deform, but also during the installation process, there is no need to weld the inner tank, etc., to avoid deformation and damage of the inner tank due to welding. The construction can be carried out without changing the structure of the inner tank, effectively ensuring the structural strength of the inner tank. At the same time, the structure of the inner and outer tanks can prevent gas leakage from directly entering the air and causing safety hazards, thereby reducing the risk of explosion.

[0052] A combined fixing method for a C-type storage tank for LNG fuel used on a ship, comprising the combined fixing device for the C-type storage tank for LNG fuel used on a ship, the method comprising the following steps:

[0053] S1, assemble and weld to obtain a combined storage tank 1, and weld a support leg 5 at the bottom of the combined storage tank 1, and paste a fiberglass reinforced plastic 8 at the bottom of the support leg 5, wherein the fiberglass reinforced plastic 8 has a bolt hole, and the bolt hole needs to be aligned with the bolt hole of the support leg 5;

[0054] S2, respectively welding the hull base 3 and the lower guide sleeve 10 on the ship deck 6, and sequentially placing the compression spring 12 and the guide column 13 into the lower guide sleeve 10;

[0055] S3, lift the combined storage tank 1 to the top of the hull base 3, and slowly lower it until the support foot 5 moves to 5-10mm above the hull base 3, and the bolt holes of the hull base 3 need to be aligned with the bolt holes of the fiberglass reinforced plastic 8;

[0056] S4, injecting epoxy resin material into the gap between the FRP 8 and the hull base 3, a baffle can be set around the FRP 8 and the hull base 3 to form a mold, and then injecting epoxy resin material into the mold, after the epoxy resin material solidifies, an epoxy resin layer 9 is formed between the FRP 8 and the hull base 3, and the lifting rope of the modular storage tank 1 is released;

[0057] S5. Use the bolt and nut assembly 7 to connect and fix the support foot 5 and the hull base 3 together. Specifically, a drill bit may be used to drill holes through the support foot 5 and the fiberglass reinforced plastic 8 to obtain bolt holes in the epoxy resin layer 9. Then, the bolts may be passed through the hull base 3, the epoxy resin layer 9, and the support foot 5, and then tightened with nuts.

[0058] S6. Lower and press the guide column 13, then put the explosion-proof box 2 on one end of the combined storage tank 1. After the upper guide sleeve 10 is put on the top of the guide column 13, weld and fix the connection between the explosion-proof box 2 and the combined storage tank 1 to complete the installation and fixation of the marine LNG fuel C-type storage tank.

[0059] Wherein, step S1 comprises the following steps:

[0060] S1.1. Weld and fix a plurality of support columns 104 to the inner walls of the left tank body 1021, the middle tank body 1022, and the right tank body 1023 respectively;

[0061] S1.2, insert the middle tank body 1022 into the middle position of the inner tank 101, so that the support column 104 corresponding to the middle tank body 1022 fits on the outer wall of the inner tank 101;

[0062] S1.3: Insert the connecting ring into the two ends of the inner tank 101 respectively until the connecting plate 1026 of the connecting ring contacts the two ends of the intermediate tank body 1022, so that the inner ring 1024 of the connecting ring fits on the outer wall of the inner tank 101, and the two ends of the intermediate tank body 1022 fit on the bottom surface of the outer ring 1025 of the connecting ring;

[0063] S1.4: Insert the left tank body 1021 and the right tank body 1023 into the two ends of the inner tank 101 respectively until the left tank body 1021 and the right tank body 1023 are in contact with the connecting plate 1026 of the connecting ring, so that the supporting columns 104 corresponding to the left tank body 1021 and the right tank body 1023 are attached to the outer wall of the inner tank 101, and one end of the left tank body 1021 and the right tank body 1023 are attached to the bottom surface of the outer ring 1025 of the connecting ring;

[0064] S1.5: Weld and fix the connection between the left tank body 1021, the middle tank body 1022, the right tank body 1023 and the outer ring 1025 of the connecting ring to obtain a combined storage tank 1;

[0065] S1.6: Weld the support leg 5 at the bottom of the combined storage tank 1 below the connecting ring. The arc-shaped support plate 14 may be welded first, and then the support leg 5 may be welded at the bottom of the arc-shaped support plate 14;

[0066] S1.7: Glue the fiberglass reinforced plastic 8 to the bottom of the supporting foot 5.

[0067] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A combined fixing device for a C-type storage tank for marine LNG fuel, characterized in that: The invention comprises a combined storage tank (1), an explosion-proof box (2) and a plurality of hull bases (3); the explosion-proof box (2) is sleeved on one end of the combined storage tank (1), and the explosion-proof box (2) and the combined storage tank (1) are welded and sealed and fixed; the air inlet pipe and the air outlet pipe of the combined storage tank (1) are both located at one end of the combined storage tank (1) inside the explosion-proof box (2), and the air inlet pipe and the air outlet pipe of the combined storage tank (1) both penetrate the explosion-proof box (2) and are connected to a connecting flange (4); a plurality of supporting feet (5) are provided at the bottom of the combined storage tank (1), and the plurality of hull bases (3) are fixed on a ship deck (6) by welding, and the plurality of supporting feet (5) are overlapped on the plurality of hull bases one by one in a corresponding manner. (3), and each of the supporting feet (5) is connected and fixed to the hull base (3) by a bolt and nut assembly (7), and each of the supporting feet (5) and the hull base (3) is provided with a glass fiber reinforced plastic (8) and an epoxy resin layer (9) arranged in sequence from top to bottom; a plurality of upper guide sleeves (10) are provided at the bottom of the explosion-proof box (2), and a plurality of lower guide sleeves (11) corresponding to the positions of the upper guide sleeves (10) are also provided on the ship deck (6), and a compression spring (12) is provided in the lower guide sleeve (11), and a guide column (13) is movably inserted between the upper guide sleeve (10) and the lower guide sleeve (11), and the guide column (13) is made of low-temperature resistant steel.

2. The combined fixing device of a C-type storage tank for LNG fuel used on a ship according to claim 1 is characterized in that: The guide column (13) is cylindrical, and the upper guide sleeve (10) and the lower guide sleeve (11) are sleeves with cylindrical inner cavities. There is a clearance fit between the guide column (13) and the upper guide sleeve (10) and the lower guide sleeve (11), and the clearance between the guide column (13) and the upper guide sleeve (10) and the lower guide sleeve (11) is 2-5 mm.

3. The combined fixing device of a C-type storage tank for LNG fuel used on a ship according to claim 1 is characterized in that: The bottoms of both ends of the combined storage tank (1) are provided with arc-shaped support plates (14), and the bottom of each arc-shaped support plate (14) is symmetrically welded with two supporting legs (5).

4. A combined fixing device for a C-type storage tank for marine LNG fuel according to any one of claims 1 to 3, characterized in that: The combined storage tank (1) comprises an inner tank (101) and an outer tank (102), wherein the outer tank (102) is sleeved on the periphery of the inner tank (101), and an insulating cavity (103) is provided between the inner tank (101) and the outer tank (102), wherein a plurality of support columns (104) are provided in the insulating cavity (103), and one end of each of the support columns (104) is fixedly connected to the inner wall of the outer tank (102) by welding, and the other end is attached to the outer wall of the inner tank (101).

5. The combined fixing device of a C-type storage tank for LNG fuel used on a ship according to claim 4 is characterized in that: The outer wall of the inner tank (101) is also wrapped with a heat insulation layer (105).

6. The combined fixing device of a C-type storage tank for LNG fuel used on a ship according to claim 4, characterized in that: The outer tank (102) comprises a left tank body (1021), a middle tank body (1022) and a right tank body (1023) which are arranged in a split manner. The left tank body (1021), the middle tank body (1022) and the right tank body (1023) are fixedly connected by welding.

7. The combined fixing device of a C-type storage tank for LNG fuel used on a ship according to claim 6 is characterized in that: A connecting ring is provided between the left tank body (1021) and the middle tank body (1022), and between the middle tank body (1022) and the right tank body (1023). The connecting ring comprises an inner ring (1024) and an outer ring (1025). The inner ring (1024) and the outer ring (1025) are connected and fixed via a plurality of connecting plates (1026). The inner ring (1024) is sleeved on the outer wall of the inner tank (101). The left tank body (1021), the middle tank body (1022) and the right tank body (1023) are all plugged into the bottom surface of the outer ring (1025), and the left tank body (1021), the middle tank body (1022) and the right tank body (1023) are all welded and fixedly connected to the outer ring (1025).

8. The combined fixing device for a C-type storage tank for LNG fuel used on a ship according to claim 7, characterized in that: The supporting foot (5) is located directly below the connecting ring.

9. A method for combining and fixing a C-type storage tank for marine LNG fuel, characterized in that: The combined fixing device for the C-type storage tank of LNG fuel for ships according to claim 8 above comprises the following steps: S1, assembling and welding to obtain a combined storage tank (1), welding a support leg (5) to the bottom of the combined storage tank (1), and pasting glass fiber reinforced plastic (8) to the bottom of the support leg (5); S2, welding the hull base (3) and the lower guide sleeve (10) on the ship deck (6), and sequentially placing the compression spring (12) and the guide column (13) in the lower guide sleeve (10); S3, hoisting the combined storage tank (1) above the hull base (3), and slowly lowering it until the supporting foot (5) moves to 5-10 mm above the hull base (3); S4, injecting epoxy resin material into the gap between the glass fiber reinforced plastic (8) and the hull base (3), after the epoxy resin material solidifies, an epoxy resin layer (9) is formed between the glass fiber reinforced plastic (8) and the hull base (3), and loosening the hoisting rope of the modular storage tank (1); S5, using a bolt and nut assembly (7) to connect and fix the support foot (5) and the hull base (3); S6. Put the explosion-proof box (2) on one end of the combined storage tank (1), and after the upper guide sleeve (10) is put on the top of the guide column (13), weld the connection between the explosion-proof box (2) and the combined storage tank (1) to fix the connection.

10. The combined fixing method of a C-type storage tank for marine LNG fuel according to claim 9, characterized in that: The step S1 comprises the following steps: S1.

1. Weld and fix a plurality of support columns (104) to the inner walls of the left tank body (1021), the middle tank body (1022), and the right tank body (1023) respectively; S1.2, insert the middle tank body (1022) into the middle position of the inner tank (101), so that the support column (104) corresponding to the middle tank body (1022) fits on the outer wall of the inner tank (101); S1.3: Insert the connecting ring into the two ends of the inner tank (101) respectively until the connecting plate (1026) of the connecting ring contacts the two ends of the intermediate tank body (1022), so that the inner ring (1024) of the connecting ring is attached to the outer wall of the inner tank (101), and the two ends of the intermediate tank body (1022) are attached to the bottom surface of the outer ring (1025) of the connecting ring; S1.4: insert the left tank body (1021) and the right tank body (1023) into the two ends of the inner tank (101) respectively until the left tank body (1021) and the right tank body (1023) are in contact with the connecting plate (1026) of the connecting ring, so that the supporting columns (104) corresponding to the left tank body (1021) and the right tank body (1023) are attached to the outer wall of the inner tank (101), and one end of the left tank body (1021) and the right tank body (1023) are attached to the bottom surface of the outer ring (1025) of the connecting ring; S1.5: The left tank body (1021), the middle tank body (1022), the right tank body (1023) and the outer ring (1025) of the connecting ring are welded and fixed to obtain a combined storage tank (1); S1.6: Weld a support foot (5) to the bottom of the combined storage tank (1) below the connecting ring; S1.7: Glue the glass fiber reinforced plastic (8) to the bottom of the supporting leg (5).

Images