A methanol fuel storage cabin of a container ship and an empty cabin structure thereof

Abstract

This invention relates to the field of marine technology, and in particular to a methanol fuel storage tank for a container ship and its isolation compartment structure. The tank includes a methanol fuel tank body and isolation compartments. The methanol fuel tank body comprises a fuel tank top plate and a fuel tank bottom plate, vertical channel walls, horizontal channel walls, side longitudinal walls, and a top edge inclined plate. The vertical channel walls are provided with bottom blocks and top blocks. The isolation compartment structure includes side longitudinal walls, a top edge inclined plate, side outer plates, and an outer bottom plate. The installation space is formed above the inner bottom plate, below the upper deck, between the side longitudinal walls and top edge inclined plates on both sides, and between the double-layer transverse bulkheads of the forward and aft cargo holds. The advantages of this invention are that all structural components on the boundaries of the methanol fuel tank body and each isolation compartment are arranged inside each isolation compartment. The longitudinal walls used to separate functional areas within the methanol fuel tank body are all channel walls, which reduces the difficulty of internal painting construction within the methanol fuel tank body and facilitates special painting construction within the methanol fuel tank body.

Description

Technical Field

[0001] This invention relates to the field of marine technology, specifically to a methanol fuel tank for a container ship and its structure for isolating empty compartments. Background Technology

[0002] Methanol is considered a leading renewable fuel that can provide a carbon-neutral fuel supply for the marine industry and support the achievement of carbon reduction targets. Currently, major shipping companies are already ordering methanol-fueled vessels to meet increasingly stringent carbon reduction requirements. Methanol fuel tanks, as compartments for storing methanol fuel, are generally integral fuel tanks, forming part of the hull structure and subjected to the same loads as adjacent hull structures, playing a crucial role in the integrity of the hull structure. Due to the flammable, explosive, and toxic nature of methanol, a surrounding airtight and liquid-tight structure is typically installed around the fuel tank to provide additional airtightness and liquid tightness, i.e., an isolation compartment, to isolate the fuel tank from external fires and internal toxic and flammable gases and liquids. As part of the hull structure, the methanol fuel tank and its isolation compartment structure must meet the functional requirements of the compartment and the requirements for structural strength and safety.

[0003] Due to methanol's low energy density, compared to traditional container ship fuel oil, methanol fuel tanks require approximately 2.5 times the capacity for the same voyage. This larger capacity leads to a significant increase in liquid sloshing loads, making it difficult for traditional hull designs to meet structural strength requirements. To avoid sacrificing cargo capacity—a key hull design metric—by encroaching on cargo hold space, methanol fuel tanks are typically located below the deckhouse. However, traditional designs restrict support structures below the deckhouse, exacerbating deckhouse vibrations and limiting transverse structural integrity, further deteriorating the torsional strength of hull beams in large-open cargo hold hull types. Ensuring sufficient fuel tank and cargo hold volume necessitates adequate space for traditional traffic, ventilation, and pump pipe arrangements. Furthermore, methanol is flammable, explosive, and toxic. The arrangement of ventilation, pump wells, and passageways in methanol fuel tanks and their isolated compartments must prevent the accumulation of hazardous gases on deck. For container ships, the limited space on the upper deck surrounding the deckhouse above the fuel tanks means conventional arrangements for ventilation, pump wells, and passageways cannot meet regulatory and risk assessment requirements. In addition, methanol is corrosive when it contains water, which can corrode the internal materials of the fuel tank made of ordinary carbon steel that come into contact with methanol. Special coating treatment is required for the surface of the internal structure of the tank. However, the large number of internal components in the traditional tank structure makes it difficult to carry out the special coating construction.

[0004] The development of methanol fuel tank technology, driven by market demand, presents an opportunity to enhance ship design and construction technology. However, the aforementioned challenges also pose significant hurdles for design and construction. To ensure the safety and economy of ship operation and enhance the competitiveness of ship design and construction, an innovative fuel tank structure design is of paramount importance. Summary of the Invention

[0005] The technical problem to be solved by this invention is: to address the characteristics of methanol fuel such as low energy density, flammability, explosiveness, toxicity and corrosiveness, to provide a methanol fuel tank and its isolation compartment structure for container ships, creatively overcoming the technical challenges in structural design, ventilation, pump pipe and channel layout, and special coating construction.

[0006] This invention solves the above-mentioned technical problems by adopting the following technical solution: It provides a methanol fuel tank for a container ship and its isolation compartment structure, including a methanol fuel tank body and an isolation compartment. The methanol fuel tank body includes a fuel tank top plate and a fuel tank bottom plate, vertical channel walls, horizontal channel walls, side longitudinal walls, and a top edge compartment ramp. The vertical channel walls are provided with bottom blocks and top blocks. The isolation compartment structure includes side longitudinal walls, a top edge compartment ramp, side outer plates, and an outer bottom plate. The space formed by the inner bottom plate, the area below the upper deck, the side longitudinal walls on both sides, the top edge compartment ramps, and the double-layer transverse bulkheads of the forward and aft cargo holds is also included. The methanol fuel tank is installed within the installation space. A double-bottom isolation compartment and a pipe tunnel are provided between the outer bottom plate and the inner bottom plate. A pipe tunnel isolation compartment is provided above the pipe tunnel. A side isolation compartment and a lower deck passage are provided between the outer side plate and the side longitudinal bulkhead. A top side compartment isolation compartment is provided between the inner wall of the lower deck passage and the top side compartment ramp. A forward isolation compartment and a rear isolation compartment are provided on the inner sides of the forward cargo hold double-layer transverse bulkhead and the aft cargo hold double-layer transverse bulkhead. A fuel tank joint is provided between the fuel tank top plate and the upper deck. A deckhouse is provided above the fuel tank joint.

[0007] Furthermore, the main body of the methanol fuel tank is located at the centerline of the ship, the vertical channel wall is arranged along the length of the ship, and the bottom block and top block are respectively located on the upper and lower parts of the vertical channel wall; the bottom block and top block are respectively located on both sides of the vertical channel wall of the main body of the methanol fuel tank.

[0008] Furthermore, the groove depth d of the vertical groove wall v 0.03h t ~0.05h t The bottom width b of the pier l 3.0d v ~4.5d v The height d of the pier l 3.0d v ~4.5dv The top width of the pier is b u 1.5d v ~3.0d v The height d of the top pier u It is 2.0d v ~3.4d v , where h t This refers to the depth of the methanol fuel tank along the height direction.

[0009] Furthermore, the horizontal channel-shaped wall is located on both sides of the vertical channel-shaped wall inside the main body of the methanol fuel tank. The horizontal channel-shaped wall is arranged along the length of the ship and is located at a distance of 0.15B to 0.25B from the centerline of the ship. The channel depth range of the horizontal channel-shaped wall is d. h It is 0.09l t ~0.13l t Where B is the maximum beam of the ship at midships, and l t The length of the methanol fuel tank along the length of the ship.

[0010] Furthermore, a top-side compartment body is provided on the upper side of the methanol fuel tank body. The methanol fuel tank body employs an inwardly inclined top-side compartment ramp on the upper part of the longitudinal wall of the side. The top-side compartment body is formed by combining the longitudinal wall of the side and the top-side compartment ramp. The lower end of the top-side compartment body is connected to the longitudinal bulkhead, and the upper end is connected to the top plate of the methanol fuel tank body. The top-side compartment body is aligned with the side bulkhead of the upper deckhouse. The initial inclination height h of the top-side compartment ramp is... s The upper end of the top side cabin ramp is connected to the fuel tank top plate, and the top side cabin ramp is aligned with the upper deckhouse sidewall, which is 0.6D to 0.8D from the bottom baseline. D is the maximum depth of the ship at midship.

[0011] Furthermore, the side walls of the front and rear isolation compartments facing the methanol fuel tank body are partially designed with a concave indentation. This concave design forms a transfer pump well and a rescue well, which are used for the arrangement of the transfer pump and the rescue passage. The concave design of the transfer pump well and the rescue well is determined by the method of determining the concave depth of the transfer pump well and the rescue well based on the external dimensions of the methanol transfer pump and ensuring that the width of the passage space inside the front and rear isolation compartments is not less than 900mm.

[0012] Furthermore, the outer side of the isolation chamber is provided with openings, through which the isolation chambers can ventilate and pass each other.

[0013] Furthermore, all structural components on the boundaries between the methanol fuel tank body and each isolated compartment are arranged inside each isolated compartment.

[0014] Furthermore, the main body of the deckhouse includes a front wall and a rear wall, and the rear wall and front wall of the fuel tank are provided on the opposite side of the barge pump well and the life well, respectively. The front wall and rear wall of the deckhouse are aligned with the rear wall and front wall of the fuel tank, respectively.

[0015] With the above structure, the beneficial effects of the present invention are as follows:

[0016] Based on the large-capacity design of the methanol fuel tank, three channel-shaped walls are installed in the beam direction within the main body of the methanol fuel tank, dividing the main body into four independent methanol fuel tank sections. This effectively controls the sway load of the main body and ensures the structural strength of the main body. In particular, by controlling the channel orientation of the channel walls, effective support is provided for the superstructure of the main body of the methanol fuel tank and the transverse bulkheads of the fore and aft double-layer cargo holds, which is beneficial for controlling the relevant structural dimensions and steel usage. At the same time, the channel depth of the vertical and horizontal channel walls, as well as the shape and dimensions of the bottom and top piers of the vertical channel walls, are set to specific values ​​relative to the depth and length of the methanol fuel tank, which can reduce the structural dimensions and steel usage of the vertical and horizontal channel walls, thereby reducing manufacturing costs.

[0017] Since the main body of the methanol fuel tank is located below the deckhouse, a top side compartment is set at the upper side of the methanol fuel tank to appropriately retain traffic and layout space above the methanol fuel tank. At the same time, the inclined plate of the top side compartment can effectively support the deckhouse structure, increase the stiffness of the vibration foundation under the deckhouse, reduce excessive vibration of the deckhouse, enhance the torsional stiffness of the ends of the beams under the deck, and improve the torsional strength of the hull beams.

[0018] The front and rear isolation compartments have recessed sidewalls facing the methanol fuel tank, forming a transport pump well and a rescue well. This design ensures the arrangement of the transport pump and rescue passage, while also ensuring passage space within the front and rear isolation compartments.

[0019] In addition, all structural components on the boundaries between the methanol fuel tank body and each isolated compartment are arranged inside each isolated compartment. The longitudinal bulkheads used to separate functional areas inside the methanol fuel tank body are all channel-shaped walls, which can reduce the difficulty of painting inside the methanol fuel tank body and facilitate special painting inside the methanol fuel tank body. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of the structure within the methanol fuel tank area of ​​the present invention. Figure 1 ;

[0021] Figure 2 This is a schematic cross-sectional view of the structure within the methanol fuel tank area of ​​the present invention. Figure 2 ;

[0022] Figure 3 This is a horizontal cross-sectional schematic diagram of the structure within the methanol fuel tank area of ​​the present invention;

[0023] Figure 4 This is a schematic longitudinal section of the structure within the methanol fuel tank area of ​​the present invention;

[0024] Figure 5 This is a schematic diagram of the methanol fuel tank compartmentation comparison scheme of the present invention. Figure 1 ;

[0025] Figure 6 This is a schematic diagram of the methanol fuel tank compartmentation comparison scheme of the present invention. Figure 2 ;

[0026] Figure 7 This is a schematic diagram of the methanol fuel tank compartmentation comparison scheme of the present invention. Figure 3 ;

[0027] Figure 8 This is a comparison diagram of the sloshing load distribution under the methanol fuel tank compartmentation scheme of the present invention;

[0028] Figure 9 For the present invention Figure 8 Deformation diagram of the methanol fuel tank compartment in Scheme 1;

[0029] Figure 10 For the present invention Figure 8 Deformation diagram of the methanol fuel tank compartment in Scheme 3.

[0030] In the diagram: 1. Fuel tank top plate; 2. Fuel tank bottom plate; 3. Vertical channel bulkhead; 4. Bottom block; 5. Top block; 6. Horizontal channel bulkhead; 7. Side longitudinal bulkhead; 8. Top edge tank ramp; 9. Side outer plating; 10. Outer bottom plate; 11. Main body of top edge tank; 12. Main body of deckhouse; 13. Upper deck; 14. Inner bottom plate; 15. Double transverse bulkhead of forward cargo hold; 16. Double transverse bulkhead of aft cargo hold; 17. Main body of methanol fuel tank; 18. Double... 19. Bottom isolation compartment; 20. Pipe tunnel main body; 21. Pipe tunnel isolation compartment; 22. Side isolation compartment; 23. Lower deck passageway; 24. Top side compartment isolation compartment; 25. Forward isolation compartment; 26. Aft isolation compartment; 27. Fuel tank joint location; 28. Barge pump well; 29. ​​Life well; 30. Deckhouse side bulkhead; 31. Fuel tank forward bulkhead; 32. Fuel tank aft bulkhead; 33. Deckhouse forward bulkhead; 34. Deckhouse aft bulkhead. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] Please see Figure 1-4A methanol fuel storage tank for a container ship and its isolation compartment structure, comprising a methanol fuel tank body 17 and an isolation compartment. The methanol fuel tank body 17 includes a fuel tank top plate 1 and a fuel tank bottom plate 2, a vertical channel wall 3, a horizontal channel wall 6, side longitudinal walls 7, and a top side inclined plate 8. A bottom block 4 and a top block 5 are provided on the vertical channel wall 3. The isolation compartment structure includes side longitudinal walls 7, top side inclined plates 8, side outer plates 9, and an outer bottom plate 10. An installation is formed by the space between the side longitudinal walls 7 and top side inclined plates 8 on both sides, and between the double transverse bulkheads 15 and 16 of the forward and aft cargo holds. The methanol fuel tank body 17 is installed within the space. A double-bottom isolation compartment 18 and a pipe tunnel body 19 are provided between the outer bottom plate 10 and the inner bottom plate 14. A pipe tunnel isolation compartment 20 is provided above the pipe tunnel body 19. A side isolation compartment 21 and a lower deck passage 22 are provided between the side outer plate 9 and the side longitudinal bulkhead 7. A top side compartment isolation compartment 23 is provided between the inner wall of the lower deck passage 22 and the top side compartment ramp 8. A forward isolation compartment 24 and a rear isolation compartment 25 are provided on the inner side of the forward cargo hold double transverse bulkhead 15 and the aft cargo hold double transverse bulkhead 16. A fuel tank joint location 26 is provided between the fuel tank top plate 1 and the upper deck 13.

[0033] Furthermore, at the centerline of the methanol fuel tank 17 in the beam direction, a vertical channel-shaped wall 3 is arranged along the length direction. The vertical channel-shaped wall 3 has a bottom pier 4 and a top pier 5 respectively at its upper and lower parts. The upper and lower ends of the panel of the vertical channel-shaped wall 3 are aligned with the side plates of the top pier 5 and the bottom pier 4, respectively. The vertical channel-shaped wall 3 is aligned with the vertical girder in the forward and aft isolation compartments 24 and 25, respectively, in the length direction. The channel depth d of the vertical channel-shaped wall 3 is... v Approximately 0.03h t ~0.05h t The preferred value is approximately 0.04h. t The cross-sectional shape of the bottom pier 4 in the beam direction is a trapezoid with a wider bottom and a narrower top, with a bottom width of b. l Approximately 3.0d v ~4.5d v The top width is the same as the groove depth of the vertical groove wall 3. The bottom pier is connected to the tunnel isolation compartment 20 arranged below. The lower ends of the inclined plates on both sides of the bottom pier are aligned with the longitudinal trusses inside the tunnel isolation compartment 20 and the tunnel body 19. The upper ends of the inclined plates on both sides of the bottom pier are aligned with the panel of the vertical groove wall 3. The height d of the bottom pier 4 is... l Approximately 3.0d v ~7.0d v The preferred value is approximately 5.0d. v The cross-sectional shape of the top pier 5 in the beam direction is a right-angled trapezoid with a narrow bottom and a wide top. The bottom width is the same as the depth of the vertical channel wall 3, and the top width is b. u 1.5d v ~3.0dv The interior of the top pier 5 is configured as an isolation compartment connected to the front isolation compartment 24 and the rear isolation compartment 25. The upper ends of the side plates of the top pier 5 are aligned with the longitudinal trusses inside the fuel tank joint 26, and the lower ends of the side plates of the top pier 5 are aligned with the panels of the vertical channel wall 3. The height d of the top pier 5 is... u Approximately 2.0d v ~3.4d v The preferred value is approximately 2.6d. v ;where h t The depth of the methanol fuel tank body 17 along the height direction is defined as follows: By setting a vertical channel wall 3 inside the methanol fuel tank body 17, the double bottom structure and the fuel tank joint location 26 and deckhouse body 12 structure above the methanol fuel tank body 17 can be effectively supported, so that the structural dimensions inside the double bottom and fuel tank joint location 26 are kept at a suitable level; in addition, by setting a suitable vertical channel depth d, v The height of the top pier is 5d. u and the height d of the bottom pier 4 l This ensures that the vertical channel wall 3 maintains a suitable strength level, while also keeping the channel wall thickness and steel consumption at an appropriate level.

[0034] Furthermore, within the methanol fuel tank body 17, horizontal channel walls 6 are arranged along the length of the ship on both sides of the vertical channel wall 3. The upper and lower ends of the horizontal channel walls 6 are aligned with the longitudinal girder in the fuel tank joint 26 and the longitudinal girder in the double-bottom isolation compartment 18, respectively. The front and rear ends of the horizontal channel wall 6 panels are aligned with the vertical girder in the forward isolation compartment 24 and the aft isolation compartment 25, respectively. The horizontal channel walls 6 are located at a distance of 0.15B to 0.25B from the centerline of the ship, preferably 0.21B. The channel depth range d of the horizontal channel walls 6 is... h It is 0.09l t ~0.13l t The preferred value is approximately 0.11l. t Where B is the maximum beam of the ship at midships, l t The length of the methanol fuel tank body 17 along the ship's length direction is defined as follows: By setting a horizontal channel wall 6 within the methanol fuel tank body 17, the double-layer transverse bulkhead 15 of the forward cargo hold and the double-layer transverse bulkhead 16 of the aft cargo hold can be effectively supported, keeping the structural dimensions within the double-layer transverse bulkheads at an appropriate level; by reasonably setting the position of the horizontal channel wall 6 in the ship's beam direction, the width of each methanol fuel tank body 17 is made to be basically the same, thereby controlling the load caused by methanol fuel sloshing on the structure within each methanol fuel tank body 17 to be numerically similar, and making the structural dimensions within each methanol tank uniformly distributed; in addition, by setting an appropriate horizontal channel depth d... v This ensures that the horizontal channel wall 6 maintains a suitable strength level, while also keeping the channel wall thickness and steel consumption at an appropriate level.

[0035] Furthermore, a top side compartment body 11 is provided on the upper side of the methanol fuel tank body 17 to appropriately retain the upper arrangement space of the methanol fuel tank body 17 and meet functional requirements such as traffic and compartment layout; the bottom plate of the top side compartment body 11 is set as an inclined plate, the lower end of which is connected to the side longitudinal wall 7, the upper end of which is connected to the fuel tank top plate 1 and aligned with the upper deckhouse side wall plate 29; its initial inclination height h s The distance from the bottom baseline is 0.6D to 0.8D, where D is the maximum depth of the ship at midship. The top side deckhouse ramp 8 connects the deckhouse sidewall 29 to the main hull – the side longitudinal wall 7, enhancing the rigidity of the lower vibration foundation of the deckhouse main body 12 and helping to control the vibration response level of the deckhouse main body 12. By reasonably setting the starting tilt height h of the top side deckhouse ramp 8, s This ensures that the top side compartment isolation compartment 23 can effectively isolate the methanol fuel tank body 17 and the lower deck passage 22, and ensures that there is sufficient ventilation space between the top side compartment isolation compartment 23 and the side compartment isolation compartment 21, and sufficient passage space within the top side compartment isolation compartment 23.

[0036] Furthermore, the side walls of the forward isolation compartment 24 and the aft isolation compartment 25 facing the methanol fuel tank main body 17 are partially recessed to form a transfer pump well 27 and a rescue well 28 for the arrangement of transfer pumps and rescue passages. The recessed design of the transfer pump well 27 and the rescue well 28, to ensure sufficient space for the methanol transfer pumps and necessary passage within the forward isolation compartment 24 and the aft isolation compartment 25, has a recess depth of 0.9–1.0 m. The methanol transfer pumps are located within the methanol fuel tank main body 17. To facilitate their arrangement, installation, and maintenance, a methanol transfer pump hoisting hole must be provided in an open area outside the upper deck 13 upper deck cabin main body 12, allowing the methanol transfer pumps to be vertically hoisted into the methanol fuel tank main body 17. For the rescue passages in the methanol fuel tank main body 17, rescue manholes must be provided on the upper deck 13 and the fuel tank top plate 1. Simultaneously, to facilitate rapid rescue in emergencies, rescue manholes on the upper deck 13 and the methanol fuel tank main body 17, as well as lower rescue passages, are also provided. In the vertical direction, they must be aligned in a straight line. Considering the flammable, explosive, and toxic characteristics of methanol, the deck lifeguard manhole cannot be located within the deckhouse main body 12 area. In this embodiment, the fuel tank forward wall 30 and fuel tank aft wall 31 are aligned with the deckhouse forward wall 32 and deckhouse aft wall 33, respectively. To meet the aforementioned requirements for the arrangement of the methanol transfer pump hoisting and lifeguard passage, recessed lifeguard manholes 28 and transfer pump manholes 27 are partially provided on the side walls of the forward isolation compartment 24 and aft isolation compartment 25 facing the methanol fuel tank main body 17. Lifeguard holes and methanol transfer pump hoisting holes are respectively provided on the upper deck 13 above them. The recessed depth of the transfer pump manhole 27 is determined based on the external dimensions of the methanol transfer pump to ensure the arrangement and maintenance space of the methanol transfer pump. The recessed depth of the lifeguard manhole 28 is determined according to the necessary lifeguard space requirements. By reasonably setting the recessed depth, the passage space width inside the forward isolation compartment 24 and aft isolation compartment 25 at the recessed position is not less than 900mm.

[0037] Furthermore, an isolation chamber is provided on the outside of the methanol fuel tank body 17 to enclose the entire fuel tank, providing a sealed space between the methanol fuel tank body 17 and other locations to isolate external ignition sources, toxic and flammable vapors; for ease of description, the isolation chambers at different locations around the methanol fuel tank body 17 are named according to their locations, and each isolation chamber is designed to be interconnected by openings, allowing ventilation and passage between the isolation chambers.

[0038] Furthermore, all structural components on the boundaries between the methanol fuel tank body 17 and each isolated compartment are arranged inside each isolated compartment to facilitate the special coating construction inside the methanol fuel tank body 17. In order to facilitate the special coating inside the methanol fuel tank body 17 and minimize the complexity of the internal structural components and construction, all structural components on the boundaries between the methanol fuel tank body 17 and each isolated compartment are arranged inside each isolated compartment. The longitudinal bulkheads used to separate functional areas inside the methanol fuel tank body 17 are all channel-shaped walls to reduce the difficulty of the internal coating construction of the methanol fuel tank body 17.

[0039] To illustrate the effect of the three longitudinal bulkheads on the sway load within the methanol fuel tank body 17, a detailed comparative study was conducted on the sway load variations under different numbers of longitudinal bulkheads in the methanol fuel tank body 17, and the impact on the structural strength of the methanol fuel tank body 17 was analyzed.

[0040] First, such as Figures 5 to 7 As shown, the proposed solutions are explained as follows: In Solution 1, no intermediate longitudinal bulkhead is provided within the methanol fuel tank body 17 area, and the entire methanol fuel tank body 17 area is a single complete methanol fuel tank body 17; In Solution 2, an intermediate longitudinal bulkhead is provided at the centerline of the ship, and the entire methanol fuel tank body 17 area is divided into two independent methanol fuel tank bodies 17 of the same width; In Solution 3, which is the three intermediate longitudinal bulkhead solution adopted in this invention, the entire methanol fuel tank body 17 area is divided into four independent methanol fuel tank bodies 17 of the same width.

[0041] like Figure 8 As shown, the calculated maximum lateral sway load on the methanol fuel tank main body 17 structure in Scheme 1 is 326.1 kPa, the calculated maximum lateral sway load on the methanol fuel tank main body 17 structure in Scheme 2 is 83.8 kPa, and the calculated maximum lateral sway load on the methanol fuel tank main body 17 structure used in Scheme 3 and this invention is 37.4 kPa. Therefore, it can be seen that by setting multiple intermediate longitudinal bulkheads within the methanol fuel tank main body 17 area, the sway load borne by the internal structure of the methanol fuel tank main body 17 can be effectively reduced.

[0042] contrast Figure 9 and Figure 10 The diagrams show the structural deformation of the methanol fuel tank body 17 when it is fully loaded, as shown in Scheme 1 and Scheme 3. By setting three intermediate longitudinal bulkheads in the methanol fuel tank body 17, the structural deformation caused by the liquid load in the tank can be effectively reduced and the structural strength of the methanol tank can be improved compared to not setting intermediate longitudinal bulkheads.

[0043] This invention divides the entire methanol fuel tank body 17 into four independent methanol fuel tank bodies 17 of equal width by setting up three intermediate longitudinal bulkheads. This can effectively reduce the swaying load borne by the methanol fuel tank body 17 and effectively improve the impact of the swaying load on the structural strength of the methanol tank.

[0044] In this invention, the methanol fuel tank body 17 and its isolation compartment structure, by setting one vertical channel wall 3 and two horizontal channel walls 6, effectively reduce sway loads. Simultaneously, they provide effective support for the transverse structures surrounding the methanol fuel tank body 17, including the double bottoms, fuel tank joint locations 26, the forward cargo hold double transverse bulkheads 15 and 16, and the aft cargo hold double transverse bulkheads 16. This helps to mitigate the problems of increased structural strength requirements and larger structural dimensions caused by using large-capacity fuel tanks, and helps control the structural weight of the methanol fuel tank body 17. By setting a top side compartment body 11 on the upper part of the methanol fuel tank body 17, the torsional strength of the hull beams and the vibration characteristics of the deckhouse body 12 can be improved.

[0045] In this invention, by employing a unique structural arrangement within the methanol fuel tank body 17 and the isolation compartment—such as a partially concave design on the side walls of the front and rear isolation compartments facing the methanol fuel tank body 17—functional requirements for pump pipe arrangement, traffic, ventilation, lifesaving, and maintenance within a limited space can be met while ensuring safe use of methanol fuel. By arranging the structure within the isolation compartment, the internal structure of the methanol fuel tank body 17 is simplified, reducing the difficulty of surface treatment and painting of the steel within the methanol fuel tank body 17, and thus helping to reduce construction time and costs.

[0046] This invention meets the structural strength requirements of ship hulls under various loading conditions and conventions. It provides a reasonable methanol tank structure within a limited fuel tank layout space, ensuring a large methanol fuel tank main body 17 capacity. It also fulfills functional requirements such as pump pipe layout, traffic, ventilation, lifesaving, and maintenance, while controlling the weight of steel, reducing construction difficulty and time. While ensuring the ship's range when using methanol fuel, it controls the weight and construction cost of the methanol fuel tank main body 17, improving the ship's market competitiveness, and ensuring the safety and economy of the ship during its operating cycle.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A methanol fuel storage tank for a container ship and its isolation compartment structure, comprising a methanol fuel tank body (17) and an isolation compartment, characterized in that: The methanol fuel tank body (17) includes a fuel tank top plate (1) and a fuel tank bottom plate (2), a vertical channel wall (3), a horizontal channel wall (6), side longitudinal walls (7), and a top side ramp (8). A bottom block (4) and a top block (5) are provided on the vertical channel wall (3). The isolation compartment structure includes side longitudinal walls (7), a top side ramp (8), side outer plates (9), and an outer bottom plate (10). Above the inner bottom plate (14), below the upper deck (13), and on both sides of the side longitudinal walls (7) and top side ramp (8), the top side ramp (9) and the top side ramp (8) are also present. The installation space is formed by the double transverse bulkheads (15) of the forward cargo hold and the double transverse bulkheads (16) of the aft cargo hold. The methanol fuel tank body (17) is set in the installation space. A double bottom isolation compartment (18) and a pipe tunnel body (19) are set between the outer bottom plate (10) and the inner bottom plate (14). A pipe tunnel isolation compartment (20) is set above the pipe tunnel body (19). A side isolation compartment (21) and a lower deck passage (22) are set between the side outer plate (9) and the side longitudinal bulkhead (7). A top-side compartment isolation compartment (23) is provided between the inner wall of the plate passage (22) and the top side compartment ramp (8). A front isolation compartment (24) and a rear isolation compartment (25) are provided on the inner side of the front cargo hold double-layer transverse bulkhead (15) and the rear cargo hold double-layer transverse bulkhead (16). The front isolation compartment (24) and the rear isolation compartment (25) have a partially concave design on the side walls facing the methanol fuel tank body (17). The concave design forms a barge pump well (27) and a rescue well (28). The fuel tank top plate (1) and the upper deck A fuel tank connector (26) is provided between (13), and a deckhouse body (12) is provided above the fuel tank connector (26); the deckhouse body (12) includes a deckhouse front wall (32) and a deckhouse rear wall (33), and a fuel tank rear wall (31) and a fuel tank front wall (30) are provided on the opposite side of the barge pump well (27) and the life well (28), and the deckhouse front wall (32) and the deckhouse rear wall (33) are aligned with the fuel tank rear wall (31) and the fuel tank front wall (30) respectively.

2. The methanol fuel storage tank and its isolated empty compartment structure for a container ship according to claim 1, characterized in that: The methanol fuel tank body (17) is located at the centerline of the ship, the vertical channel wall (3) is arranged along the length of the ship, and the top block (5) and bottom block (4) are respectively located on the upper and lower parts of the vertical channel wall (3); the bottom block (4) and top block (5) are respectively located on both sides of the vertical channel wall (3) of the methanol fuel tank body (17).

3. The methanol fuel storage tank and its isolation compartment structure for a container ship according to claim 2, characterized in that: The groove depth d of the vertical groove wall (3) v 0.03h t ~0.05h t The bottom width b of the pier (4) l 3.0d v ~4.5d v The height d of the bottom pier (4) l 3.0d v ~4.5d v The top width b of the top pier (5) u 1.5d v ~3.0d v The height d of the top pier (5) u 2.0d v ~3.4d v , where h t The depth of the methanol fuel tank body (17) along the height direction.

4. The methanol fuel storage tank and its isolated empty compartment structure for a container ship according to claim 1, characterized in that: The horizontal channel wall (6) is located on both sides of the vertical channel wall (3) inside the methanol fuel tank body (17). The horizontal channel wall (6) is arranged along the length of the ship and is located at a distance of 0.15B to 0.25B from the centerline of the ship. The channel depth range of the horizontal channel wall (6) is d. h It is 0.09l t ~0.13l t Where B is the maximum beam of the ship at midships, and l t The length of the methanol fuel tank (17) along the ship's length direction.

5. The methanol fuel storage tank and its isolated empty compartment structure for a container ship according to claim 1, characterized in that: The methanol fuel tank body (17) is provided with a top side tank body (11) on the upper side of the hull. The methanol fuel tank body (17) adopts an inwardly inclined top side tank ramp (8) on the upper part of the side longitudinal wall (7). The top side tank body (11) is formed by combining the side longitudinal wall (7) and the top side tank ramp (8). The lower end of the top side tank body (11) is connected to the longitudinal bulkhead, and the upper end of the top side tank body (11) is connected to the top plate of the methanol fuel tank body (17). The top side tank body (11) is aligned with the upper deckhouse side bulkhead (29). The initial tilt height h of the top side tank ramp (8) is... s The upper end of the top side cabin ramp (8) is connected to the fuel tank top plate (1) at a distance of 0.6D to 0.8D from the bottom baseline. The top side cabin ramp (8) is aligned with the upper deckhouse side wall plate (29), where D is the maximum depth of the ship at midship.

6. The methanol fuel storage tank and its isolation compartment structure for a container ship according to claim 1, characterized in that: The concave depth of the transport pump well (27) and the rescue well (28) is set based on the external dimensions of the methanol transport pump and ensures that the passage space width inside the front isolation chamber (24) and the rear isolation chamber (25) is not less than 900 mm.

7. The methanol fuel storage tank and its isolated empty compartment structure for a container ship according to claim 1, characterized in that: The isolation chambers are provided with openings on their outer sides, and the isolation chambers can be ventilated and pass through each other through the openings.

8. The methanol fuel storage tank and its isolated empty compartment structure for a container ship according to claim 1, characterized in that: The main body of the methanol fuel tank (17) and all structural components on the boundary of each isolated compartment are arranged inside each isolated compartment.

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