Methanol fuel cabin of oil tanker

Abstract

The utility model provides a methanol fuel cabin of an oil tanker, which is characterized in that at least one pair of methanol fuel cabins are arranged on a main deck of a tail cargo cabin of the oil tanker in bilateral symmetry; the outer wall of the methanol fuel cabin is composed of a methanol fuel cabin top plate, a methanol fuel cabin bottom plate, a methanol fuel cabin front end wall, a methanol fuel cabin rear end wall and a pair of methanol fuel cabin longitudinal walls, and the methanol fuel cabin front end wall, the methanol fuel cabin rear end wall and the pair of methanol fuel cabin longitudinal walls are connected between the methanol fuel cabin top plate and the methanol fuel cabin bottom plate and coincide with the two cargo cabin longitudinal cabin walls in the vertical direction. The front end wall of the methanol fuel cabin and the rear end wall of the methanol fuel cabin are respectively aligned with the two cargo cabin transverse bulkheads; the methanol fuel cabin bottom plate is installed on the upper surface of the main deck through a rectangular coaming, the side edges of the rectangular coaming coincide with the methanol fuel cabin front end wall, the methanol fuel cabin rear end wall and the pair of methanol fuel cabin longitudinal walls, and a triangular toggle plate is connected between the rectangular coaming and the main deck. The methanol fuel cabin of the large oil tanker does not occupy the space of a cargo cabin, does not affect the arrangement of superstructures and fitting-out equipment, reduces the still water bending moment of a middle arch, and saves the weight of steel materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ships, specifically to a methanol fuel tank of oil tanker. BACKGROUND

[0002] With the global shipping industry accelerating the decarbonization process, the demand for alternative fuel ships is showing a significant growth trend. Among the many alternative fuel options, methanol has become the preferred alternative fuel for new energy ships due to its clean and green energy characteristics. However, how to more efficiently arrange the methanol fuel tank in the limited space of the ship has become an important problem that needs to be solved. When designing and arranging, it is necessary to consider the optimization of space utilization, the rationality of functional layout, and the control of production cost and other factors.

[0003] Currently, there are mainly two kinds of arrangement schemes for the methanol fuel tank of oil tanker, but each of them has certain limitations:

[0004] Scheme 1: Set the methanol fuel tank at the rear of the superstructure, as shown in Figure 1 , the methanol fuel tank 01 is located above the open deck. Although this arrangement is convenient, it will directly affect the layout of the superstructure and outfitting equipment, resulting in an increase in the mid-arch static water bending moment, making the load of the ship beam larger. This increase in load not only brings challenges to the ship structure, but also leads to an increase in steel weight, which in turn affects the trim performance of the ship.

[0005] Scheme 2: Arrange the methanol fuel tank inside the cargo hold, as shown in Figure 2 , the methanol fuel tank 02 is located above the open deck. Although this method can avoid the impact on the superstructure, it will inevitably occupy valuable cargo space, reducing the cargo carrying capacity of the ship and affecting economic benefits. INVENTION CONTENTS

[0006] The utility model provides a methanol fuel tank of oil tanker, which arranges the methanol fuel tank on the main deck of the most tail cargo hold of the oil tanker. This layout not only avoids the impact on the layout of the superstructure and outfitting equipment in the traditional arrangement scheme, but also does not occupy the cargo space, thereby ensuring that the cargo carrying capacity of the ship is not affected. In addition, the bulkhead of the methanol fuel tank is arranged in alignment with the transverse bulkhead and longitudinal bulkhead of the cargo hold, ensuring the maximization of structural strength, reducing stress concentration, and improving the overall stability of the ship hull. The specific scheme of the invention is as follows:

[0007] The utility model provides a methanol fuel tank of oil tanker, the main deck of the most tail cargo hold of oil tanker is equipped with the transverse bulkhead and longitudinal bulkhead of cargo hold that cross distributes under the main deck to divide the area below the main deck into a plurality of cargo holds, a plurality of ballast tanks are arranged between the cargo hold and the outer wall of the oil tanker,

[0008] The upper surface of the main deck of the last cargo tank of the oil tanker is provided with at least one pair of methanol fuel tanks along the central axis of the hull length and left-right symmetry,

[0009] The outer wall of the methanol fuel tank is composed of a methanol fuel tank top plate, a methanol fuel tank bottom plate, and a methanol fuel tank front end wall, a methanol fuel tank rear end wall and a pair of methanol fuel tank longitudinal walls connected between the methanol fuel tank top plate and the methanol fuel tank bottom plate, the pair of methanol fuel tank longitudinal walls coincide with the two cargo tank longitudinal bulkheads in the vertical direction and are arranged in alignment, and the methanol fuel tank front end wall and the methanol fuel tank rear end wall are arranged in alignment with the two cargo tank transverse bulkheads.

[0010] The methanol fuel tank bottom plate is installed on the upper surface of the main deck through a rectangular coaming, the side edges of the rectangular coaming coincide with the methanol fuel tank front end wall, the methanol fuel tank rear end wall and the pair of methanol fuel tank longitudinal walls in the vertical direction, and a triangular knee plate is connected between the rectangular coaming and the main deck.

[0011] Further, the outer wall material of the methanol fuel tank is 316L stainless steel, galvanized steel plate or aluminum alloy.

[0012] Further, the inner wall of the methanol fuel tank is coated with a corrosion-resistant coating.

[0013] Further, the side wall of the rectangular coaming is provided with an inspection manhole, and the inspection manhole is provided with a rotating flange cover.

[0014] Further, the side wall of the rectangular coaming is provided with a reinforcing rib.

[0015] The methanol fuel tank is arranged above the main deck of the last cargo tank of the oil tanker, the methanol fuel tank longitudinal wall is arranged in alignment with the cargo tank longitudinal bulkhead, and the methanol fuel tank front and rear end walls are arranged in alignment with the cargo tank front and rear transverse bulkheads.

[0016] 1) Optimize space utilization: The methanol fuel tank is arranged above the main deck of the last cargo tank, does not occupy the internal space of the cargo tank, avoids the problem of reducing the cargo carrying capacity of the ship due to occupying the space of the cargo tank in the existing scheme 2, and guarantees the economic benefit of the ship; at the same time, the height of the tank body is set to 60%-70% of the height from the main deck to the bottom layer of the superstructure, a higher space utilization rate is realized in the limited space, the view of the superstructure is not affected, the static water bending moment is reduced, and the steel weight is saved.

[0017] 2) Balance the load of the ship: At least one pair of methanol fuel tanks are arranged along the central axis of the hull length and left-right symmetry, the center of gravity is balanced by three-dimensional modeling software, the weight difference between the left and right tank bodies is ensured to be less than or equal to 5%, the problem of ship roll caused by uneven load is effectively avoided, and the stability of ship navigation is improved.

[0018] 3) Enhance structural strength: the longitudinal walls of the methanol fuel tank and the longitudinal walls of the cargo tank, the front end wall and the rear end wall are aligned in the vertical direction, which can form a rigid support frame with the original transverse and longitudinal bulkhead structure of the cargo tank, reducing the additional structural support design; the triangular knee plate connected between the rectangular coaming and the main deck can evenly distribute the vertical load of the tank body to the deck skeleton, reducing local stress concentration; the T-shaped reinforcing rib welded inside the coaming further enhances the structural strength of the tank body. According to the finite element analysis verification, the stress in the fillet area of the rounded rectangular tank is reduced by 30% compared with the right angle, which reduces the stress concentration problem and improves the structural reliability of the tank body.

[0019] 4) Reduce the weight of the ship: the outer wall material of the methanol fuel tank can be selected from light materials such as aluminum alloy, which has a density of only 1 / 3 of that of steel, significantly reducing the weight of the ship, reducing the weight of a single tank by about 40%, which helps to improve the trim performance of the ship, and at the same time reduces the use of steel, reducing the overall weight of the ship.

[0020] 5) Improve corrosion resistance: the outer wall material is selected from 316L stainless steel, galvanized steel plate or aluminum alloy, and the inner wall is coated with a three-layer corrosion-resistant coating system of "epoxy primer + vinyl glass flake intermediate paint + polyurea topcoat". After the methanol immersion test (50℃, 1000h), the coating has no blistering or peeling, which can effectively deal with corrosion problems in different environments and prolong the service life of the methanol fuel tank.

[0021] 6) Easy maintenance: the side wall of the rectangular coaming is provided with a maintenance manhole, equipped with a rotating flange cover, and the manhole position avoids the reinforcing rib and leaves operation space, which facilitates personnel to carry tools in and out, improving the convenience of maintenance.

[0022] 7) Simplify design and construction: the methanol fuel tank is arranged by using the existing transverse and longitudinal bulkhead structure of the cargo tank, which simplifies the design process; the symmetrical arrangement facilitates standardized design and construction, reduces design and construction costs, and improves construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a schematic diagram of setting a methanol fuel tank on the deck in the prior art;

[0025] Figure 2 is a schematic diagram of setting a methanol fuel tank in the cargo tank in the prior art;

[0026] Figure 3 The figure is a transverse schematic view of the methanol fuel tank arrangement of the large oil tanker of the present application.

[0027] Figure 4 The figure is a longitudinal schematic view of the methanol fuel tank arrangement of the large oil tanker of the present application.

[0028] Figure 5 The figure is a longitudinal sectional view of the methanol fuel tank. DETAILED DESCRIPTION

[0029] In the following description, a large number of specific details are set forth in order to provide a more thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail in order to avoid obscuring the present application.

[0030] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description in order to explain the technical scheme of the present application. The preferred embodiments of the present application are described in detail as follows, however, the present application can have other embodiments in addition to these detailed descriptions.

[0031] Referring to Figures 3-5 The present application provides an oil tanker methanol fuel tank, the main deck 7 of the most tail cargo tank of the oil tanker is provided with transversely and longitudinally distributed cargo tank transverse bulkhead 11 and cargo tank longitudinal bulkhead 8 below the main deck 7 to separate the area below the main deck 7 into several cargo tanks 2, and several ballast tanks 3 are arranged between the cargo tank 2 and the outer wall of the oil tanker.

[0032] The upper surface of the main deck 7 of the most tail cargo tank of the oil tanker is provided with at least one pair of methanol fuel tanks 1 along the left and right symmetry of the central axis of the ship body, and a plurality of pairs of methanol fuel tanks (such as 2-4 pairs, adjusted according to the tonnage of the ship) are arranged along the left and right symmetry of the central axis of the ship body, and the center of gravity is balanced by three-dimensional modeling software (such as ShipConstructor) to ensure that the weight difference between the left and right tanks is ≤5%, so as to avoid the ship from tilting due to uneven load.

[0033] The methanol fuel tank 1 is a rounded rectangular tank body, and the fillet radius R of the rounded rectangular tank body is adjusted according to the size of the tank body, which not only reduces stress concentration (verified by finite element analysis, the stress in the fillet area is reduced by 30% compared with the right angle), but also facilitates the passage of deck personnel; the tank body height H = 60%-70% of the height from the main deck to the bottom of the superstructure, which takes into account the space utilization rate and the view of the superstructure.

[0034] The outer wall of the methanol fuel tank 1 is composed of a methanol fuel tank top plate 4, a methanol fuel tank bottom plate 6, and a methanol fuel tank front end wall 10, a methanol fuel tank rear end wall 9 and a pair of methanol fuel tank longitudinal walls 5 connected between the methanol fuel tank top plate 4 and the methanol fuel tank bottom plate 6, the pair of methanol fuel tank longitudinal walls 5 coincides with the two cargo tank longitudinal bulkheads 8 in the vertical direction and is arranged in alignment, and the methanol fuel tank front end wall 10 and the methanol fuel tank rear end wall 9 are arranged in alignment with the two cargo tank transverse bulkheads 11 respectively;

[0035] The methanol fuel tank bottom plate 6 is installed on the upper surface of the main deck 7 through a rectangular coaming 12, the side edges of the rectangular coaming 12 coincide with the methanol fuel tank front end wall 10, the methanol fuel tank rear end wall 9 and the pair of methanol fuel tank longitudinal walls 5 in the vertical direction. The coaming is made of thick galvanized steel plate, the inside is welded with T-shaped reinforcing ribs (web height 200mm, panel width 100mm) with a spacing of 500mm to form a rigid support frame; the coaming and the main deck 7 are fixed by M24 high-strength bolts (spacing 300mm) and welding in double, the bolt hole is designed as a countersunk head to avoid the protrusion of the deck surface affecting personnel walking.

[0036] A triangular knee plate is connected between the rectangular coaming 12 and the main deck 7, the triangular knee plates are evenly distributed around the coaming (spacing ≤800mm), and the coaming and the deck are welded with full penetration to ensure no cracks through UT detection, which uniformly disperses the vertical load of the tank body (including the weight of methanol liquid) to the deck skeleton and reduces local stress concentration.

[0037] In an optional embodiment, the outer wall material of the methanol fuel tank is 316L stainless steel, galvanized steel plate or aluminum alloy. 316L stainless steel: suitable for offshore and high-salt corrosion environment, yield strength ≥220MPa, pitting resistance coefficient ≥32, no additional corrosion protection treatment is required on the surface, but the cost is higher (about 3 times that of ordinary carbon steel), recommended for small and medium-sized ships or pilot projects. Galvanized steel plate: hot-dip galvanizing process (plating thickness ≥85μm), combining corrosion resistance and economy, suitable for inland and coastal routes, and the damaged plating needs to be checked regularly and coated with epoxy zinc-rich paint (interval 2-3 years). Aluminum alloy (5083-H116): the density is only 1 / 3 of steel, which significantly reduces the weight of the ship body (about 40% weight reduction of a single tank), but the problem of galvanic corrosion of dissimilar metals needs to be solved, which is protected by setting an insulating gasket (such as polytetrafluoroethylene) and a sacrificial anode (zinc block) at the contact between the aluminum alloy and the steel coaming.

[0038]

[0039] In an optional embodiment, the inner wall of the methanol fuel tank is coated with a corrosion-resistant coating. The corrosion-resistant coating scheme: adopt a "epoxy primer (thickness 50 μm) + vinyl glass flake intermediate paint (thickness 300 μm) + polyurea topcoat (thickness 200 μm)" three-layer system, after methanol immersion test (50℃, 1000h) coating without blistering, falling off, surface roughness Ra≤50 μm, reduce the risk of methanol residue and fouling. Coating construction process: the inner wall of the tank is pretreated to Sa2.5 level (sand blasting), and the construction is carried out in the environment with humidity < 85% and temperature 15-30℃, and each layer of coating is cured for 24h, and finally the adhesion is detected by grid method (ISO 2409) ≥5MPa.

[0040]

[0041] In an optional embodiment, the side wall of the rectangular coaming 12 is provided with an inspection manhole. A φ600mm circular manhole is arranged in the middle of the longitudinal wall 5 of the methanol fuel tank, and a rotating quick-opening flange cover (with a silica gel sealing ring, pressure bearing ≥0.5MPa) is arranged, the manhole position avoids the reinforcing rib, and an 800mm×800mm operation space is reserved around the manhole, so that personnel can carry tools in and out.

[0042] The preferred embodiments of the utility model are described above. It should be understood that the utility model is not limited to the above specific embodiments, and the equipment and structures not fully described should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications to the technical solutions of the utility model by using the disclosed methods and technical contents without departing from the scope of the technical solutions of the utility model, or modify equivalent embodiments with equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model, which does not depart from the content of the technical solutions of the utility model, still belongs to the protection scope of the technical solutions of the utility model.

Claims

1. A methanol fuel tank of a tanker, the tanker being provided with transverse bulkheads (11) and longitudinal bulkheads (8) transversely and longitudinally arranged to divide the area below the main deck (7) of the aftmost cargo hold of the tanker into a plurality of cargo holds (2), and a plurality of ballast tanks being arranged between the cargo holds (2) and the outer wall of the tanker, characterized in that, at least one pair of methanol fuel tanks (1) is symmetrically arranged along the central axis of the tanker body on the upper surface of the main deck (7) of the aftmost cargo hold of the tanker, the methanol fuel tank (1) is a rounded rectangular tank body, the outer wall of the methanol fuel tank (1) is composed of a methanol fuel tank top plate (4), a methanol fuel tank bottom plate (6), and a methanol fuel tank front end wall (10), a methanol fuel tank rear end wall (9), and a pair of methanol fuel tank longitudinal walls (5) connected between the methanol fuel tank top plate (4) and the methanol fuel tank bottom plate (6), the pair of methanol fuel tank longitudinal walls (5) coincide with and are aligned with the two cargo hold longitudinal bulkheads (8) in the vertical direction, and the methanol fuel tank front end wall (10) and the methanol fuel tank rear end wall (9) are respectively aligned with the two cargo hold transverse bulkheads (11); the methanol fuel tank bottom plate (6) is installed on the upper surface of the main deck (7) through a rectangular coaming (12), the side edges of the rectangular coaming (12) coincide with the methanol fuel tank front end wall (10), the methanol fuel tank rear end wall (9), and the pair of methanol fuel tank longitudinal walls (5) in the vertical direction, and a triangular knee plate is connected between the rectangular coaming (12) and the main deck (7).

2. A methanol fuel tank for a tanker according to claim 1, characterized in that The outer wall material of the methanol fuel tank is 316L stainless steel, galvanized steel plate, or aluminum alloy.

3. A methanol fuel tank for a tanker according to claim 1, characterized in that The inner wall of the methanol fuel tank is coated with a corrosion-resistant coating.

4. A methanol fuel tank for a tanker according to claim 1, characterized in that The side wall of the rectangular coaming (12) is provided with an inspection manhole, and the inspection manhole is provided with a rotating flange cover.

5. A methanol fuel tank for a tanker according to claim 1, characterized in that, The side wall of the rectangular coaming (12) is provided with a reinforcing rib.

Images