Liquified gas storage tank for ship

Abstract

A liquefied gas storage tank for a ship, comprising a tank body (1) and a support system, the tank body (1) consisting of a plurality of curved panels (102, 103, 104, 105, 106, 107, 108) which are connected and transition smoothly. The tank body is composed of the plurality of curved panels which are connected and transition smoothly, and the radius R of each curved panel is 10 to 50 times the camber height H of the curved panel, meeting both the requirements for high-pressure storage of liquefied gas and the maximization of cargo hold capacity for the liquefied gas storage tank for a ship. Each curved panel comprises a steel outer plate (11), a carbon fiber coating layer (12), and a heat insulation layer (13), which can improve the pressure bearing capacity of the liquefied gas storage tank for a ship while reducing the weight of the liquefied gas storage tank, thus lowering the construction costs and shipping costs of the liquefied gas storage tank. The support system comprises a plurality of support saddles (21, 22) symmetrically arranged about the center line of a cross section of the tank body, and the structure or size of the support saddles can be adjusted on the basis of the curvature of the curved panels, ensuring that the tank body is stably placed in the ship's hold.

Description

A marine liquefied gas storage tank Technical Field

[0001] The present invention relates to the field of shipbuilding, and in particular to a ship-used liquefied gas storage tank. Background Art

[0002] In view of the demand for gas transportation at sea, one of the most practical storage methods is to liquefy the gas and then store it under pressure and insulated. In order to meet the needs of high-pressure storage of certain liquefied gases, cylindrical or spherical liquefied gas storage tanks are usually used. However, with the large-scale development of liquefied gas storage tanks, the disadvantages of cylindrical or spherical liquefied gas storage tanks not matching the cabin line shape are becoming increasingly prominent. The capacity utilization rate of cylindrical or spherical liquefied gas storage tanks is low. Under the limited main dimensions of the ship, it is impossible to maximize the cabin capacity, which reduces transportation efficiency. Although the existing diamond or membrane type liquefied gas storage tanks can match the cabin line shape and have a high cabin capacity utilization rate, they cannot withstand pressures above 0.7 bar, that is, they cannot meet the needs of high-pressure storage of certain liquefied gases. Therefore, the industry is in urgent need of a ship-mounted liquefied gas storage tank with strong pressure bearing capacity and high cabin capacity utilization rate.

[0003] Summary of the Invention

[0004] In response to the defects in the existing technology, the present application provides a marine liquefied gas storage tank to solve the technical problem that the existing marine liquefied gas storage tank cannot simultaneously meet the two requirements of high-pressure storage and maximum tank capacity.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A marine liquefied gas storage tank, characterized in that it comprises a tank body composed of a plurality of smoothly transitionally connected curved panels, wherein a top curved panel, two upper inclined curved panels of equal size, two side curved panels of equal size, two lower inclined curved panels of equal size and a lower curved panel are sequentially arranged from top to bottom on the cross section of the tank body, and a front curved panel and a rear curved panel are respectively provided at the front and rear ends of the tank body, and each curved panel is smoothly connected by a transition connecting curved plate, and the radius of the curved panel is 10 to 50 times the arch height of the curved panel.

[0006] In one embodiment, the radius of each curved panel, the span of the curved panel between adjacent transition connecting curved panels, and the arch height of each curved panel satisfy the following calculation formula:

[0007] Wherein, R is the radius of the arc panel, L is the span of the arc panel between adjacent transition connecting arc panels, and H is the arch height of the arc panel.

[0008] In one embodiment, the curved panel is made of a steel outer plate, and a carbon fiber coating layer and a thermal insulation layer are provided on the outer surface of the tank body. The carbon fiber coating tape is coated on the outer surface of the tank body to form a carbon fiber coating layer, and the thermal insulation layer is coated on the outer surface of the carbon fiber coating layer.

[0009] In one embodiment, it also includes a support system for supporting the tank body, the support system includes a plurality of support saddles symmetrically arranged about the center line of the cross section of the tank body, and the support saddles are fixedly connected to the lower arc panel and the bottom of the cabin where the tank body is placed.

[0010] In one embodiment, the supporting saddle includes a pillar, a supporting panel, a pressure-bearing pad, a saddle panel, and a saddle frame, the lower arc panel is fixedly connected to the pillar, the pillar is fixedly connected to the supporting panel, the supporting panel is supported from below by the pressure-bearing pad, the pressure-bearing pad is supported from below by the saddle panel, a saddle panel is fixed on the saddle panel surrounding the pressure-bearing pad, the saddle panel is fixedly connected to the saddle frame, the saddle frame is fixedly connected to the bottom of the cabin, and a reinforcing structure is provided on the saddle frame.

[0011] In one embodiment, the pillars, the supporting panels and the lower arc panels are made of the same type of steel, the lower arc panels are welded to the pillars, the pillars are welded to the supporting panels, the saddle panels, saddle panels, saddle frames and reinforcement structures are made of the same type of steel as the cabin bottom, the saddle panels are welded to the saddle frames, and the saddle frames are welded to the cabin bottom.

[0012] In one embodiment, the support panels in each of the support saddles are at the same horizontal height, and the heights of the pillars at different positions of the lower arc panel are adjusted according to the curvature of the lower arc panel.

[0013] In one embodiment, the structures and sizes of the pillars, support panels, pressure pads, saddle panels and saddle panels in each of the supporting saddles are the same, and the heights of the saddle frames and reinforcement structures at different positions of the lower arc panel are adjusted according to the curvature of the lower arc panel.

[0014] In one embodiment, the structures and sizes of the pillars, support panels, saddle panels, saddle panels, saddle frames and reinforcement structures in each supporting saddle are the same, and the heights of the pressure pads at different positions of the lower arc panel are adjusted according to the curvature of the lower arc panel.

[0015] In one embodiment, the support saddle includes a central support saddle and an oblique support saddle. The central support saddle is arranged at the center line of the lower arc panel, and the center line of the central support saddle coincides with the center line of the lower arc panel. The oblique support saddles are arranged on the transition connecting arc plate connecting the lower arc panel and the side arc panel, and the center line of the oblique support saddle passes through the center of the transition connecting arc plate.

[0016] In one embodiment, the tank body further includes a thickening ring, which is arranged on the cross section corresponding to the support saddle on the tank body. The thickening ring includes a thickened steel outer plate and an insulation layer, and the insulation layer is coated on the outer surface of the thickened steel outer plate.

[0017] In one embodiment, the width of the thickened ring is greater than the width of the supporting saddle to which the thickened ring corresponds.

[0018] In one embodiment, the cross-sectional area of ​​the tank body provided with a supporting saddle is defined as a saddle area, and the cross-sectional area of ​​the tank body not provided with a supporting saddle is defined as a saddle-free area. In the saddle-free area, the carbon fiber covering tape is annularly wrapped around the outer surface of the steel outer plate along the cross-sectional contour of the tank body; in the saddle area, the carbon fiber covering tape is unidirectionally or cross-bidirectionally wrapped around the steel outer plate.

[0019] In one embodiment, the cross-sectional area of ​​the tank body provided with a support saddle is defined as a saddle area, and the cross-sectional area of ​​the tank body not provided with a support saddle is defined as a no-saddle area, a lower arc web is provided between the support saddle and the lower arc panel, the center line of the lower arc web coincides with the center line of the support saddle, and arc-shaped transition wedges are symmetrically provided on the left and right sides of the lower arc web about the center line of the lower arc web in a direction perpendicular to the length of the tank, the width of the lower arc web in a direction perpendicular to the length of the tank is greater than the width of the pillar in a direction perpendicular to the length of the ship, the upper surface of the lower arc web and the upper surface of the arc-shaped transition wedge are both in direct contact with the outer surface of the lower arc panel, the lower surface of the lower arc web, the lower surface of the arc-shaped transition wedge and the outer surface of the lower arc panel not covered by the arc-shaped transition wedge form a smooth curved surface, and the carbon fiber covering tape is annularly covered on the outer surface of the steel outer plate along the cross-sectional contour of the tank body.

[0020] In one embodiment, the pillar is a cylinder. In the saddle area, the length of the carbon fiber covering tape along the tank length direction is half of the distance between the center lines of two adjacent pillars along the ship length direction. The carbon fiber covering tape is annularly covered on the outer surface of the steel outer plate along the cross-sectional profile of the tank body. When the carbon fiber covering tape passes through the pillar, the carbon fiber covering tape first contacts the pillar tangentially, then contacts the partial arc of the pillar, and finally separates from the pillar tangentially. The two tangent points of the same carbon fiber covering tape and the same pillar are symmetrical about the center line of the pillar along the ship length direction, and the tangent points of adjacent carbon fiber covering tapes with the same pillar are symmetrical about the center line of the pillar perpendicular to the ship length direction.

[0021] In one embodiment, the pillar is a non-cylindrical body, and a plurality of fixed rivets are arranged at equal distances along the length of the tank near the edges of the arc-shaped transition wedge on the left and right sides of the lower arc surface web. In the saddle area, a carbon fiber covering tape is arranged with a length along the length of the ship that is half the distance between the center lines of two adjacent fixed rivets along the length of the ship. The carbon fiber covering tape is annularly covered on the outer surface of the steel outer plate along the cross-sectional profile of the tank body. When the carbon fiber covering tape passes through the fixed rivet, the carbon fiber covering tape surrounds the fixed rivet.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The marine liquefied gas storage tank in the present application includes a tank body and a support system composed of a plurality of smoothly transitionally connected arc panels. The tank body is composed of a plurality of smoothly transitionally connected arc panels, and the radius R of each arc panel is 10 to 50 times the arc surface arch height H, which can simultaneously meet the two requirements of high-pressure storage of liquefied gas and maximization of the capacity of the marine liquefied gas storage tank; and the arc panel in the present application includes a steel outer plate, a carbon fiber coating layer and a thermal insulation layer, which can simultaneously improve the pressure-bearing capacity of the marine liquefied gas storage tank and reduce the weight of the liquefied gas storage tank, thereby reducing the construction cost and ship transportation cost of the liquefied gas storage tank; the support system in the present application includes a plurality of support saddles symmetrically arranged about the center line of the cross section of the tank body. The structure or size of the support saddle can be adjusted according to the curvature of the arc panel, so that the tank body can be placed more stably in the cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] FIG1 is a longitudinal cross-sectional view of a marine liquefied gas storage tank according to an embodiment of the present application;

[0026] FIG2 is a schematic cross-sectional view of a tank body of a marine liquefied gas storage tank according to an embodiment of the present application;

[0027] FIG3 is a schematic diagram of the structure of the curved panel material in an embodiment of the present application;

[0028] FIG4 is a schematic diagram of the size structure of the curved panel in an embodiment of the present application;

[0029] FIG5 is a schematic diagram of the supporting saddle structure in an embodiment of the present application;

[0030] FIG6 is a schematic diagram of a first arrangement of the support saddle in an embodiment of the present application;

[0031] FIG7 is a schematic diagram of a second arrangement of the support saddle in an embodiment of the present application;

[0032] FIG8 is a schematic diagram of a third arrangement of support saddles in an embodiment of the present application;

[0033] FIG9 is a schematic diagram of a fourth arrangement of support saddles according to an embodiment of the present application;

[0034] FIG10 is a schematic diagram of a tank body provided with a thickening ring in an embodiment of the present application;

[0035] FIG11 is a schematic diagram of the thickened ring material structure in an embodiment of the present application;

[0036] FIG12 is a schematic diagram of the arrangement of a marine liquefied gas storage tank on a ship according to an embodiment of the present application;

[0037] FIG13 is a schematic diagram of a first oblique winding method of a carbon fiber coated tape in an embodiment of the present application;

[0038] FIG14 is a schematic diagram of a second oblique winding method of a carbon fiber coated tape in an embodiment of the present application;

[0039] FIG15 is a third schematic diagram of the oblique winding method of the carbon fiber coated tape in an embodiment of the present application;

[0040] FIG16 is a partial cross-sectional schematic diagram of a carbon fiber covering tape covering method with a lower curved web in an embodiment of the present application;

[0041] FIG17 is a top view of a first wrapping method of a carbon fiber wrapping tape with a lower curved web in an embodiment of the present application;

[0042] FIG18 is a partial enlarged schematic diagram of a pillar and a carbon fiber covering tape in a first covering method of a carbon fiber covering tape with a lower curved web according to an embodiment of the present application;

[0043] FIG19 is a partial cross-sectional schematic diagram of a second wrapping method of a carbon fiber wrapping tape with a lower curved web in an embodiment of the present application;

[0044] FIG20 is a top view of a second wrapping method of a carbon fiber wrapping tape with a lower curved web in an embodiment of the present application;

[0045] Figure markings: 1. Tank body; 101. Top arc panel; 102. Upper inclined arc panel; 103. Side arc panel; 104. Lower inclined arc panel; 105. Lower arc panel; 106. Rear arc panel; 107. Front arc panel; 108. Transition connecting arc plate; 11. Steel outer plate; 12. Carbon fiber coating; 13. Thermal insulation layer; 11a. Thickened steel outer plate; 14. Thickening ring; 15. Carbon fiber coating tape; 2. Support saddle; 201. Pillar; 202. Support panel; 203. Pressure pads; 204. Saddle panel; 205. Saddle panel; 206. Saddle frame; 207. Reinforcement structure; 208. Lower arc surface web; 209. Arc-shaped transition wedge; 210. Fixing rivet; 21. Center support saddle; 22. Oblique support saddle; 3. Ship; 301. Cabin. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0048] This embodiment discloses a marine liquefied gas storage tank, comprising a tank body 1 composed of a plurality of smoothly transitionally connected curved panels. As shown in FIG2 , a top curved panel 101, two upper inclined curved panels 102 of equal size, two side curved panels 103 of equal size, two lower inclined curved panels 104 of equal size, and a lower curved panel 105 are sequentially arranged from top to bottom on the cross section of the tank body 1. As shown in FIG1 , a rear curved panel 106 and a front curved panel 107 are respectively arranged at the front and rear ends of the tank body 1. The curved panels are smoothly transitionally connected by transition connecting curved panels 108. As shown in FIG4 , the radius of each curved panel is defined as R, the span between the curved surface and the adjacent transition connecting curved panel 108 is defined as L, and the arch height of the curved surface is defined as H. The smaller the radius R of the curved panel, the greater the curvature of the curved panel, the lower the tank capacity utilization rate of the tank body 1, and the stronger the pressure bearing capacity of the tank body 1. In order to simultaneously meet the two requirements of high-pressure bearing pressure of the tank body 1 and maximization of the cabin capacity, the radius R of the curved panel is 10 to 50 times the arch height H of the curved surface. Specifically, R, L, and H should satisfy the following calculation formula:

[0049] As shown in Figures 6-9, the minimum distance between the tank body 1 and the side wall of the cabin 301 where the tank body 1 is placed is 380 to 400 cm, and the minimum distance between the tank body 1 and the bottom of the cabin 301 is 380 to 450 cm.

[0050] To improve the pressure-bearing capacity of marine liquefied gas storage tanks, the curved panels are made of steel outer plates 11. As shown in Figure 3, a carbon fiber coating 12 and a thermal insulation layer 13 are provided on the outer surface of the tank body 1. The thickness of the carbon fiber coating 12 is designed according to the tank pressure. The carbon fiber coating 12 provides a pressure support capacity of no less than 10% to 30% of the tank vapor pressure. The thermal insulation layer 13 insulates the tank body 1 and reduces heat exchange between the inside and outside of the tank. A carbon fiber coating tape 15 is wrapped around the outer surface of the tank body 1 to form the carbon fiber coating 12, and the thermal insulation layer 13 is coated on the outer surface of the carbon fiber coating 12.

[0051] In order to place the tank body 1 in the cabin 301 of the ship 3, as shown in Figures 6-10 and 12, the marine liquefied gas storage tank also includes a support system for supporting the tank body 1, and the support system includes a plurality of support saddles 2 symmetrically arranged about the center line of the cross section of the tank body 1, and the support saddle 2 is fixedly connected to the lower arc panel 105 and the bottom of the cabin 301. As shown in Figure 5, the support saddle 2 includes a pillar 201, a support panel 202, a pressure pad 203, a saddle panel 204 and a saddle frame 206, the lower arc panel 105 is fixedly connected to the pillar 201, the pillar 201 is fixedly connected to the support panel 202, the support panel 202 is fixedly connected to the pressure pad 203, the pressure pad 203 is fixedly connected to the saddle panel 204, the saddle panel 204 is fixedly connected to the saddle frame 206, and the saddle frame 206 is fixedly connected to the bottom of the cabin 301. To improve the load-bearing capacity of the saddle frame 206, a reinforcement structure 207 is provided on the saddle frame 206. In this embodiment, the pillars 201, support panel 202, and lower arc panel 105 are made of the same type of steel. The lower arc panel 105 is welded to the pillars 201, and the pillars 201 are welded to the support panel 202. The saddle panel 204, saddle coaming 205, saddle frame 206, and reinforcement structure 207 are made of the same type of steel as the bottom of the cabin 301. The saddle panel 204 is welded to the saddle frame 206, and the saddle frame 206 is welded to the bottom of the cabin 301. The reinforcement structure 207 is welded to the saddle frame 206 and is a reinforcing rib or connecting plate. To better secure the pressure-bearing skids 203, an open saddle panel 205 is provided on the upper surface of the saddle panel 204. The pressure-bearing skids 203 are compacted and positioned within the saddle panel 205. Epoxy resin is poured between the pressure-bearing skids 203, the saddle panel 204, and the saddle panel 205 to securely connect the pressure-bearing skids 203 to the saddle panel 205. The pressure-bearing skids 203 are made of a wood material that is moth-resistant, water-resistant, crack-resistant, has good insulation properties, and has stable chemical properties. In this embodiment, the pressure-bearing skids 203 are made of birch, which is a laminated wood made from birch veneer impregnated with resin and hot-pressed.

[0052] Because the lower curved panel 105 has a curvature, different locations of the lower curved panel 105 have different distances from the bottom of the cabin 301. To ensure stable placement of the tank 1, different support saddle arrangements can be used. Arrangement 1 of the support saddle 2 is shown in FIG6 . The support panels 202, pressure-bearing pads 203, saddle panels 204, saddle panels 205, saddle frames 206, and reinforcement structures 207 of each support saddle 2 are identical in structure and size. The support panels 202 are at the same horizontal height. The heights of the support posts 201 at different locations of the lower curved panel 105 are adjusted according to the curvature of the lower curved panel 105.

[0053] The second arrangement of the supporting saddle 2 is shown in Figure 7. The structures and sizes of the pillars 201, supporting panels 202, pressure-bearing pads 203, saddle panels 204 and saddle panels 205 in each supporting saddle 2 are the same. The heights of the saddle frames 206 and the reinforcing structures 207 at different positions of the lower arc panel 105 are adjusted according to the curvature of the lower arc panel 105.

[0054] The third arrangement of the supporting saddle 2 is shown in Figure 8. The structures and sizes of the pillars 201, supporting panels 202, saddle panels 204, saddle panels 205, saddle frames 206 and reinforcing structures 207 in each supporting saddle 2 are the same, and the heights of the pressure pads 203 at different positions of the lower arc panel 105 are adjusted according to the curvature of the lower arc panel 105.

[0055] The fourth arrangement mode of the support saddle 2 is shown in Figure 9. The support saddle 2 includes a central support saddle 21 and an oblique support saddle 22. The central support saddle 21 is arranged at the center line of the lower arc panel 105. The center line of the central support saddle 21 coincides with the center line of the lower arc panel 105. The oblique support saddle 22 is arranged on the transition connecting arc plate 108 connecting the lower arc panel 105 and the lower oblique arc panel 104. The width of the support panel 202 and the saddle panel 204 of the central support saddle 21 in the cross section of the tank body 1 is 20% to 35% of the span Lp of the lower arc panel 105. The center line of the oblique support saddle 22 passes through the center of the transition connecting arc plate 108.

[0056] To facilitate wrapping the carbon fiber wrapping tape 15 around the tank body 1 and installing the support saddle 2 below the tank body 1, as shown in FIG10 , the tank body 1 also includes a thickening ring 14. The thickening ring 14 is arranged on the cross-section of the tank body 1 corresponding to the support saddle 2. As shown in FIG11 , the thickening ring 14 includes a thickened steel outer plate 11a and a thermal insulation layer 13. The thermal insulation layer 13 is coated on the outer surface of the thickened steel outer plate 11a. The thickened steel outer plate 11a provides support for the steam pressure inside the tank body 1, ensuring airtightness and controllable structural deformation under high pressure conditions inside the tank body 1. The thermal insulation layer 13 insulates the tank body 1 and reduces heat exchange between the inside and outside of the tank. In other areas of the tank body 1 outside the thickening ring 14, the carbon fiber wrapping tape 15 is annularly wrapped around the outer surface of the steel outer plate 11 along the cross-sectional contour of the tank body 1 to form a carbon fiber coating layer 12. The thermal insulation layer 13 is coated on the outer surface of the carbon fiber coating layer 12. In the length direction of the tank body 1, the width of the thickening ring 14 is greater than the width of the support saddle 2 corresponding to the thickening ring 14. Specifically, the range of the thickening ring 14 is defined as the distance expanded before and after the support saddle 2 as Lz, and Lz is the maximum value between 0.8m and 2% of the length of the tank body 1.

[0057] The cross-sectional area of ​​the tank body 1 provided with the support saddle 2 is defined as the saddle area, and the cross-sectional area of ​​the tank body 1 not provided with the support saddle 2 is defined as the no-saddle area. If the tank body 1 does not include a thickening ring 14, and a support saddle 2 is provided below the tank body 1, in order to cover the outer surface of the tank body 1 with the carbon fiber coating layer 12 as much as possible, the marine liquefied gas storage tank can adopt different carbon fiber coating methods. In the no-saddle area, the carbon fiber coating tape 15 is annularly coated on the outer surface of the steel outer plate 11 along the cross-sectional profile of the tank body 1. As shown in Figures 13-15, in the saddle area, the carbon fiber coating tape 15 extends obliquely through the support saddles 2 and wraps around the steel outer plate 11. The carbon fiber covering tape 15 can be as shown in Figure 13, where the carbon fiber covering tape 15 is wrapped from the left rear side of the tank body 1 to the right front side of the tank body 1, or as shown in Figure 14, where the carbon fiber covering tape 15 is wrapped from the right rear side of the tank body 1 to the front side of the seat of the tank body 1, that is, the carbon fiber covering tape 15 unidirectionally covers the steel outer plate 11. The carbon fiber covering tape 15 can also be as shown in Figure 15, where the carbon fiber covering tape 15 is wrapped from the left rear side of the tank body 1 to the right front side of the tank body 1, and the carbon fiber covering tape 15 is also wrapped from the right rear side of the tank body 1 to the left front side of the tank body 1, that is, the carbon fiber covering tape 15 cross-bidirectionally covers the steel outer plate 11, and the carbon fiber covering tape 15 is wrapped around the steel outer plate 11 to form a carbon fiber covering layer 12, and the thermal insulation layer 13 is covered on the outer surface of the carbon fiber covering layer 12.

[0058] Marine liquefied gas storage tanks can also adopt other carbon fiber covering methods, as shown in Figures 16 and 19. A lower curved web 208 is arranged between the support saddle 2 and the lower curved panel 105. The center line of the lower curved web 208 coincides with the center line of the support saddle 2. Arc-shaped transition wedges 209 are symmetrically arranged on the left and right sides of the lower curved web 208 about the center line of the lower curved web 208 in the direction perpendicular to the length of the tank. The width of the lower curved web 208 in the direction perpendicular to the length of the tank is greater than the width of the pillar 201 in the direction perpendicular to the length of the ship. The upper surface of the lower curved web 208 and the upper surface of the arc-shaped transition wedge 209 are both in direct contact with the outer surface of the lower curved panel 105. The lower surface of the lower curved web 208, the lower surface of the arc-shaped transition wedge 209 and the outer surface of the lower curved panel 105 not covered by the arc-shaped transition wedge 209 form a smooth curved surface. Through the setting of the lower arc surface web 208, when the support saddle 2 supports the tank body 1, the support saddle 2 is fixedly connected to the lower arc surface web 208, which increases the force-bearing area of ​​the lower arc panel 105, avoids damage to the lower arc panel 105, and avoids force concentration at the welding position of the lower arc panel 105 and the support 201, thereby improving the safety of the tank body 1.

[0059] When the pillar 201 is a cylinder, as shown in Figures 16 and 17, in the saddle area, the width of the carbon fiber covering tape 15 along the length direction of the tank is half the distance between the center lines of two adjacent pillars 201 along the length direction of the tank, and the carbon fiber covering tape 15 is annularly covered on the outer surface of the steel outer plate 11 along the cross-sectional profile of the tank body 1. When the carbon fiber covering tape 15 passes through the pillar 201, as shown in Figure 18, the carbon fiber covering tape 15 first contacts tangentially with the pillar 201, then contacts the partial arc of the pillar 201, and finally separates tangentially from the pillar 201. The two tangent points of the same carbon fiber covering tape 15 and the same pillar 201 are symmetrical about the center line of the pillar 201 along the length direction of the ship, and the tangent points of adjacent carbon fiber covering tapes 15 with the same pillar 201 are symmetrical about the center line of the pillar 201 perpendicular to the length direction of the tank. In this carbon fiber covering tape covering method, the angle between the radius passing through the tangent point and the radius along the direction perpendicular to the length of the ship is 30°. By setting the above-mentioned carbon fiber covering tape wrapping method, the carbon fiber covering tape 15 can be smoothly wrapped around the cylindrical pillar 201, and the area of ​​the carbon fiber covering tape 15 covering the steel outer plate 11 can be as large as possible, avoiding the carbon fiber breakage caused by sudden changes in the winding method of the carbon fiber covering tape 15.

[0060] When the pillar 201 is non-cylindrical, as shown in Figures 19 and 20, multiple fixing rivets 210 are evenly spaced along the length of the tank near the edges of the arc-shaped transition wedge 209 on the left and right sides of the lower curved web 208. As shown in Figures 19 and 20, in the saddle area, a carbon fiber covering tape 15 is provided with a length along the length of the tank equal to half the distance between the center lines of two adjacent fixing rivets 210 along the length of the tank. The carbon fiber covering tape 15 is annularly wrapped around the outer surface of the steel outer plate 11 along the cross-sectional profile of the tank body 1. When the carbon fiber covering tape 15 passes through the fixing rivet 210, it surrounds the fixing rivet 210. The above-mentioned carbon fiber covering tape wrapping method is suitable for pillars 201 of various shapes.

[0061] This carbon fiber coating method can also be used for conventional spherical, cylindrical, double-ear and triple-ear pressure storage cabins.

[0062] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A marine liquefied gas storage tank, characterized in that: The invention comprises a tank body (1) composed of a plurality of smoothly transitionally connected curved panels, wherein a top curved panel (101), two upper inclined curved panels (102) of equal size, two side curved panels (103) of equal size, two lower inclined curved panels (104) of equal size and a lower curved panel (105) are sequentially arranged on the cross section of the tank body (1) from top to bottom, and a front curved panel (107) and a rear curved panel (106) are respectively arranged at the front and rear ends of the tank body (1), and the curved panels are smoothly transitionally connected by transitionally connected curved panels (108), and the radius of the curved panel is 10 to 50 times the arch height of the curved panel.

2. The marine liquefied gas storage tank according to claim 1, characterized in that: The radius of each arc panel, the span of the arc panel between adjacent transition connecting arc panels, and the arch height of each arc panel satisfy the following calculation formula: Wherein, R is the radius of the arc panel, L is the span of the arc panel between adjacent transition connecting arc panels, and H is the arch height of the arc panel.

3. The marine liquefied gas storage tank according to claim 1, characterized in that: The curved panel is made of a steel outer plate (11), a carbon fiber coating layer (12) and a heat insulation layer (13) are provided on the outer surface of the tank body (1), the carbon fiber coating tape (15) is coated on the outer surface of the tank body (1) to form a carbon fiber coating layer (12), and the heat insulation layer (13) is coated on the outer surface of the carbon fiber coating layer (12).

4. The marine liquefied gas storage tank according to claim 3, characterized in that: It also includes a support system for supporting the tank body (1), the support system including a plurality of support saddles (2) symmetrically arranged about a center line on a cross section of the tank body (1), the support saddles (2) fixedly connecting the lower arc panel (105) and the bottom of the cabin where the tank body (1) is placed.

5. The marine liquefied gas storage tank according to claim 4, characterized in that: The supporting saddle (2) comprises a pillar (201), a supporting panel (202), a pressure-bearing pad (203), a saddle panel (204), and a saddle frame (206); the lower arc panel (105) is fixedly connected to the pillar (201); the pillar (201) is fixedly connected to the supporting panel (202); the supporting panel (202) is supported from below by the pressure-bearing pad (203); the pressure-bearing pad (203) is supported from below by the saddle panel (204); a saddle panel (205) surrounding the pressure-bearing pad (203) is fixedly connected to the saddle panel (204); the saddle panel (204) is fixedly connected to the saddle frame (206); the saddle frame (206) is fixedly connected to the bottom of the cabin (301); and a reinforcing structure (207) is provided on the saddle frame (206).

6. The marine liquefied gas storage tank according to claim 5, characterized in that: The pillar (201), the support panel (202) and the lower arc panel (105) are made of the same type of steel, the lower arc panel (105) is welded to the pillar (201), the pillar (201) is welded to the support panel (202), the saddle panel (204), the saddle panel (205), the saddle frame (206) and the reinforcement structure (207) are made of the same type of steel as the bottom of the cabin (301), the saddle panel (204) is welded to the saddle frame (206), and the saddle frame (206) is welded to the bottom of the cabin (301).

7. The marine liquefied gas storage tank according to claim 5, characterized in that: The support panels (202) in each of the support saddles (2) are at the same horizontal plane height, and the heights of the pillars (201) at different positions of the lower arc panel (105) are adjusted according to the curvature of the lower arc panel (105).

8. The marine liquefied gas storage tank according to claim 5, characterized in that: The structures and sizes of the pillars (201), support panels (202), pressure pads (203), saddle panels (204) and saddle panels (205) in each of the supporting saddles (2) are the same, and the heights of the saddle frames (206) and the reinforcing structures (207) at different positions of the lower arc panel (105) are adjusted according to the curvature of the lower arc panel (105).

9. The marine liquefied gas storage tank according to claim 5, characterized in that: The structures and dimensions of the pillars (201), support panels (202), saddle panels (204), saddle panels (205), saddle frames (206) and reinforcement structures (207) in each supporting saddle (2) are all the same, and the heights of the pressure-bearing pads (203) at different positions of the lower arc panel (105) are adjusted according to the curvature of the lower arc panel (105).

10. The marine liquefied gas storage tank according to claim 4, characterized in that: The support saddle (2) comprises a central support saddle (21) and an oblique support saddle (22); the central support saddle (21) is arranged at the center line of the lower arc panel (105); the center line of the central support saddle (21) coincides with the center line of the lower arc panel (105); the oblique support saddle (22) is arranged on a transition connecting arc plate (108) connecting the lower arc panel (105) and the side arc panel (103); the center line of the oblique support saddle (22) passes through the center of the transition connecting arc plate (108).

11. The marine liquefied gas storage tank according to claim 4, characterized in that: The tank body (1) further comprises a thickening ring (14), wherein the thickening ring (14) is arranged on a cross section corresponding to the supporting saddle (2) on the tank body (1), and the thickening ring (14) comprises a thickened steel outer plate (11a) and a heat insulation layer (13), wherein the heat insulation layer (13) is coated on the outer surface of the thickened steel outer plate (11a).

12. The marine liquefied gas storage tank according to claim 11, characterized in that: The width of the thickening ring (14) is greater than the width of the supporting saddle (2) corresponding to the thickening ring (14).

13. The marine liquefied gas storage tank according to claim 4, characterized in that: The cross-sectional area of ​​the tank body (1) provided with a supporting saddle (2) is defined as a saddle area, and the cross-sectional area of ​​the tank body (1) not provided with a supporting saddle (2) is defined as a saddle-free area. In the saddle-free area, the carbon fiber coating tape (15) is annularly coated on the outer surface of the steel outer plate (11) along the cross-sectional profile of the tank body (1); in the saddle area, the carbon fiber coating tape (15) is unidirectionally or cross-bidirectionally coated on the steel outer plate (11).

14. The marine liquefied gas storage tank according to claim 6, characterized in that: The cross-sectional area of ​​the tank body (1) provided with a supporting saddle (2) is defined as a saddle area, and the cross-sectional area of ​​the tank body (1) not provided with a supporting saddle (2) is defined as a non-saddle area. A lower curved surface web (208) is provided between the supporting saddle (2) and the lower curved panel (105). The center line of the lower curved surface web (208) coincides with the center line of the supporting saddle (2). Arc-shaped transition wedges (209) are symmetrically provided on the left and right sides of the lower curved surface web (208) along a direction perpendicular to the length of the tank with respect to the center line of the lower curved surface web (208). The lower curved surface web (208) is provided along a direction perpendicular to the length of the tank. The width in the tank length direction is greater than the width of the pillar (201) in the direction perpendicular to the ship length; the upper surface of the lower curved web (208) and the upper surface of the arc-shaped transition wedge (209) are both in direct contact with the outer surface of the lower curved panel (105); the lower surface of the lower curved web (208), the lower surface of the arc-shaped transition wedge (209) and the outer surface of the lower curved panel (105) not covered by the arc-shaped transition wedge (209) form a smooth curved surface; the carbon fiber coating tape (15) is annularly coated on the outer surface of the steel outer plate (11) along the cross-sectional profile of the tank body (1).

15. The marine liquefied gas storage tank according to claim 14, characterized in that: The pillar (201) is a cylinder. In the saddle area, a carbon fiber coating tape (15) is arranged with a length along the tank length direction equal to half of the distance between the center lines of two adjacent pillars (201) along the ship length direction. The carbon fiber coating tape (15) is annularly coated on the outer surface of the steel outer plate (11) along the cross-sectional profile of the tank body (1). When the carbon fiber coating tape (15) passes through the pillar (201), the carbon fiber coating tape (15) first contacts the pillar (201) tangentially, then contacts a part of the arc of the pillar (201), and finally separates tangentially from the pillar (201). The two tangent points between the same carbon fiber coating tape (15) and the same pillar (201) are symmetrical about the center line of the pillar (201) along the ship length direction, and the tangent points between adjacent carbon fiber coating tapes (15) and the same pillar (201) are symmetrical about the center line of the pillar (201) perpendicular to the ship length direction.

16. The marine liquefied gas storage tank according to claim 14, characterized in that: The support (201) is a non-cylindrical body. A plurality of fixed rivets (210) are evenly spaced along the length of the tank at the edges of the left and right sides of the lower curved web (208) near the arc-shaped transition wedge (209). In the saddle area, a carbon fiber coating tape (15) is arranged with a length along the length of the ship that is half the distance between the center lines of two adjacent fixed rivets (210) along the length of the ship. The carbon fiber coating tape (15) is annularly coated on the outer surface of the steel outer plate (11) along the cross-sectional profile of the tank body (1). When the carbon fiber coating tape (15) passes through the fixed rivet (210), the carbon fiber coating tape (15) surrounds and coats the fixed rivet (210).

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