Liquefied gas transport ship with continuous top side cabin and deck

Abstract

An A-shaped cabin is arranged in a liquefied gas ship body, the top side cabins are arranged on the tops of the two sides of the A-shaped cabin, the shape of the outer surface of the A-shaped cabin is consistent with the shape of the interior of the ship body, the deck above the A-shaped cabin is a three-section type deck, and the three-section type deck is arranged in a bilateral symmetry mode with the central axis of the A-shaped cabin as the center. According to the invention, the ship body deck of the liquefied gas ship is changed from a one-section type into a multi-section type inclined downward deck, so that in a channel with limited ship length, ship width and depth, cargo loading with larger cabin capacity can be realized, higher economic benefit is achieved, maximum loading of the existing liquefied gas ship can be realized, the loading rate of liquefied gas is improved, the construction process is simplified, and the cost is reduced. And the weight of the empty ship is reduced, and huge market prospects and considerable economic benefits are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship gas drag reduction, and in particular relates to a liquefied gas transport ship with a topside tank connected to a deck. Background Art

[0002] Green ammonia is considered to be one of the most promising alternative fuels for achieving zero-carbon shipping goals. As a zero-carbon energy source, ammonia fuel can meet more stringent greenhouse gas emission requirements and enable ships to meet the ultimate emission reduction target in 2050. It is expected that by the mid-1930s, the trade volume of clean ammonia will reach 76 million tons, four times the trade volume in 2020. By 2025, the annual trade volume of clean ammonia will exceed 120 million tons. As the demand for clean ammonia is expected to expand, the demand for long-distance liquefied gas transport ships with a stable supply will also continue to increase. At present, liquefied gas ships in the shipping market can also serve as liquefied gas carriers, but only 30% of the world's liquefied gas fleet can transport liquefied gas. Due to restrictions on waterways and ports, only 50 ultra-large liquefied gas carriers have this capability, and the capacity is insufficient.

[0003] For VLGC / VLAC (very large liquefied petroleum gas / liquefied gas carrier), the route with the largest trade volume is the US-China route. Due to the restrictions on US waterways and ports, the length of mainstream VLGC / VLAC is limited to within 230m, the width is limited to within 36.6m, and the draft is limited to within 12.2m, resulting in limited depth, such as Figure 1 As shown, the existing liquefied gas hull deck 1 is a one-stage inclined deck, which is mainly used to prevent water accumulation on the deck. The distance between the top of the cargo hold and the centerline of the main deck cannot be less than 1650 mm; the bottom 7 is a double-layer structure, and the distance from the outer wall of the A-type tank is B, B ≥ {2M / 15 or 2m smaller}. Therefore, the overall loading weight of the VLGC / VLAC ship type is severely limited. Most VLGC / VLACs use A-type tanks. Under the condition of limited size, how to expand the capacity of the A-tank and increase the loading capacity is a key problem to be solved by this patent. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a liquefied gas transport ship with a topside tank connected to a deck, aiming to achieve a larger tank capacity without increasing the length, width and depth of the ship, so as to achieve the purpose of maximum loading of the existing liquefied gas ship type. The technical solution adopted is: A liquefied gas transport ship with a topside tank connected to a deck, wherein an A-type tank is arranged inside the liquefied gas hull, the outer surface shape of the A-type tank is consistent with the inner shape of the hull, and the deck above the A-type tank adopts a three-section deck, which is symmetrically arranged with the central axis of the A-type tank as the center.

[0005] The three - section deck from the central axis of Hold A to the ship's side is in sequence a straight section, a large - inclination section, and a small - inclination section. The straight section is parallel to the hull baseline. Both the large - inclination section and the small - inclination section form angles with the hull baseline. The angle formed by the small - inclination section and the baseline is less than 5 degrees. The large - inclination section and the small - inclination section form an angle R2, where 130° < R2 < 160°.

[0006] The small - inclination section is also the top - side tank deck at the top of the top - side tank. The bottom of the top - side tank has a top - side tank inclined plate. The top - side tank inclined plate is butt - joined with the large - inclination section to form a continuous plate. The end of the top - side tank inclined plate stops at a distance H from the ship's side, where 600 < H < 800. The angle R3 formed by the top - side tank inclined plate and the ship's side satisfies 45° < R3 < 75° and R3 < R2 - 90°. The inclined plate at the top of Hold A is parallel to the large - inclination section. The inclined plate at the top of Hold A extends upward to connect with the deck of Hold A. The deck of Hold A is parallel to the straight section. The top - side tank inclined plate and the large - inclination section are butt - joined to form a continuous plate, which can make the ship's structural strength stronger and at the same time, the hold volume of Hold A can be expanded to the maximum. The top - side tank deck is the small - inclination section deck.

[0007] For the above - mentioned liquefied gas carrier with a continuous top - side tank and deck, further, the length of the straight section is C1, the straight length at the large - inclination section is C2, and the straight length at the small - inclination section is C3. C2 < C1 and C3 + C2 > C1.

[0008] For the above - mentioned liquefied gas carrier with a continuous top - side tank and deck, further, the overall width of the three - section deck is 2M, and 0.4M ≤ C1 ≤ 0.5M.

[0009] For the above - mentioned liquefied gas carrier with a continuous top - side tank and deck, further, deck beams are provided on the lower surface or the upper surface of the three - section deck, and support ribs are provided on the inner surface of the ship's side. The ends of the deck beams and the support ribs both stop at the end of the top - side tank inclined plate.

[0010] For the above - mentioned liquefied gas carrier with a continuous top - side tank and deck, further, the angle R1 formed by the large - inclination section and the straight section satisfies 130° < R1 < 160°.

[0011] For the above - mentioned liquefied gas carrier with a continuous top - side tank and deck, further, the liquefied gas hull has a double - bottom, single - hull, single - deck structure.

[0012] For the above - mentioned liquefied gas carrier with a continuous top - side tank and deck, further, the outer surface of Hold A is wrapped with an insulating layer.

[0013] In the above-mentioned liquefied gas transport ship with a topside tank connected to a deck, further, a plurality of groups of strong frames are provided at intervals on the top inner wall and the bottom inner wall of the A-type tank, and the reinforcing beam structure is arranged above the strong frames. The top inner wall of the A-type tank is the top and bottom of the A-type tank inside the expanded structure.

[0014] The above-mentioned liquefied gas transport ship in which the topside tank is continuous with the deck, further, is provided with ribs in the topside tank, and a plurality of reinforcing ribs are provided on the ribs.

[0015] The above-mentioned liquefied gas transport ship with a topside tank continuous with the deck, further, is provided with an anti-slip structure and an anti-roll structure between the A-type tank and the hull, and an anti-roll structure is respectively provided at the center of the bottom and the top of the A-type tank.

[0016] By changing the hull deck of a liquefied gas ship from a single-stage type to a multi-stage downwardly inclined deck, a larger cargo capacity can be loaded in a waterway where the ship length, ship width and draft are limited, which has higher economic benefits, can achieve the maximum loading of existing liquefied gas ship types, improve the loading rate of liquefied gas, simplify the construction process, and reduce the empty ship weight. The present invention has huge market prospects and considerable economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a typical cross-sectional structure of an existing liquefied gas carrier; Figure 2 This is a schematic diagram of the outward-turning structure of the deck beam of a liquefied gas carrier of the present invention; Figure 3 This is a schematic diagram of the inward-turning structure of the deck beam of a liquefied gas carrier of the present invention; Among them, 1-three-section deck, 2-supporting ribs, 4-top side tanks, 5-deck beams, 6-type A tanks, 7-double bottom, 8-side, 9-top side tank sloping plates. DETAILED DESCRIPTION

[0018] The present invention will be further described in conjunction with the accompanying drawings.

[0019] A liquefied gas carrier with a topside tank connected to the deck, for example, a liquefied gas carrier with a length of less than 230m, a width of 36.6m, and a depth of 23.6m. Figure 2 As shown, a type A tank is arranged inside the liquefied gas hull. The outer surface shape of the type A tank is consistent with the inner shape of the hull. The deck above the type A tank adopts a three-section deck. The three-section deck is symmetrically arranged with the central axis of the type A tank as the center. The outside of the type A tank is wrapped with an insulating layer and fixed to the bottom of the ship through a number of bottom support structures arranged in longitudinal columns and spaced apart from each other. A roll-stop structure is arranged at the center of the bottom and top of the type A tank, and an air dome is also required on the top of the type A tank.

[0020] The three-section deck is a straight section, a large inclined section and a small inclined section from the centerline of the A-type cabin to the side. The straight section is parallel to the baseline of the hull. The large inclined section and the small inclined section form an angle with the baseline of the hull. The length of the straight section is C1=8935mm, the large inclined section is C2=3585mm, and the small inclined section is C3=5780mm. The angle formed by the small inclined section and the baseline is less than 5 degrees. The large inclined section and the straight section form an angle of R1=144°, and the large inclined section and the small inclined section form an angle of R2=147°.

[0021] The small inclined section is also the top side tank top plate at the top of the top side tank. The bottom of the top side tank is provided with a top side tank inclined plate. The top side tank inclined plate is connected to the large inclined section to form a continuous plate. The angle formed between the top side tank inclined plate and the side is R3=54°. The top tank plate is parallel to the straight section. Ribs are arranged in the top side tank. Several reinforcing ribs are arranged on the rib plate 4 structure. No large opening is arranged, but lightening holes are still arranged. Multiple reinforcing ribs are arranged on the rib plate. A deck beam (such as Figure 2 The deck beam can also be set on the upper surface of the deck (as shown in Figure 3 As shown in the figure, supporting ribs are arranged on the inner surface of the hull side, and the ends of the deck beam and the supporting ribs stop at the ends of the top side tank inclined plate.

[0022] The present invention does not increase the depth of the model, and the capacity of each meter of the A-type tank is 624m 2 , the deck is raised, and the capacity of the A-type cabin is expanded. Before and after the A-cabin renovation, the additional cabin capacity ∆V per meter of the A-type cabin is: (1) When the deck beam is turned downward, ∆Vd is calculated as follows: ΔVd=(D3+D2 / sin(R)2)*sinR*(N-D1 / (sinR*tanR))+2*D1*K=68.6m 3 ; (2) When the deck beam is turned upward and outward, ∆Vu is calculated as follows: ΔVu=(D3+D2)*sinR*N+2*D2*K=84.1m 3 ; Where: R is the angle between the inclined plate of the top side tank and the side of the ship before the expansion of the A-type tank, R=65°; N is the width of the top inclined plate of the expanded A-type cabin before expansion, N=8490mm; K is half of the width of the front cabin top plate of the expanded A-type cabin, K=8740mm; D1 is the height difference between the expanded A-type tank before and after expansion when the deck beam is turned inward, D1=2100mm; D2 is the height difference between the expanded A-type tank before and after expansion when the deck beam is turned outward, D2=3000mm; D3 is the height difference between the front and rear sides of the expanded A-type cabin, D3=1100mm.

[0023] The present invention provides a design scheme for expanding the capacity of a type A tank of a multi-section deck liquefied gas transport ship. By changing the hull deck of the liquefied gas ship from a single section to a multi-section inclined downward deck, a larger cargo capacity can be loaded in a waterway with limited length, width and depth, which has higher economic benefits, can achieve the maximum loading of existing liquefied gas ship types, improve the loading rate of liquefied gas, simplify the construction process, and reduce the empty ship weight. The present invention has huge market prospects and considerable economic benefits.

Claims

1. A liquefied gas carrier with a topside tank connected to a deck, characterized in that: The interior of the liquefied gas hull is provided with a Type A tank. At the top of both sides of the Type A tank, wing tanks are provided. The outer surface shape of the Type A tank is consistent with the interior shape of the hull. The deck above the Type A tank adopts a three-section deck, which is symmetrically arranged left and right with the central axis of the Type A tank as the center. The three-section deck from the central axis of the Type A tank to the side is in turn a straight section, a large inclination section, and a small inclination section. The straight section is parallel to the hull baseline. Both the large inclination section and the small inclination section form an angle with the hull baseline. The angle formed by the small inclination section and the baseline is less than 5 degrees. The large inclination section and the small inclination section form an angle R2, where 130° < R2 < 160°. The small inclination section is also the top plate of the wing tank at the top of the wing tank. The bottom of the wing tank is provided with a wing tank inclined plate. The wing tank inclined plate is butted with the large inclination section to form a continuous plate. The end of the wing tank inclined plate stops at a distance H from the side, where 600 < H < 800. The angle R3 formed by the wing tank inclined plate and the side is such that 45° < R3 < 75° and R3 < R2 - 90°. The top inclined plate of the Type A tank is parallel to the large inclination section. The top inclined plate of the Type A tank extends upward to connect with the top plate of the Type A tank. The top plate of the Type A tank is parallel to the straight section.

2. A liquefied gas carrier with a topside tank connected to a deck according to claim 1, characterized in that: The length of the straight section is C1, the straight length at the large inclination section is C2, and the straight length at the small inclination section is C3. C2 < C1 and C3 + C2 > C1.

3. A liquefied gas carrier with a topside tank continuous with the deck according to claim 2, characterized in that: The overall width of the three-section deck is 2M, and 0.4M ≤ C1 ≤ 0.5M.

4. A liquefied gas carrier with a topside tank continuous with the deck according to claim 1, characterized in that: Deck beams are provided on the lower surface or the upper surface of the three-section deck. Support rib plates are provided on the inner surface of the hull side. The ends of the deck beams and the support rib plates both stop at the end of the wing tank inclined plate.

5. A liquefied gas carrier with a topside tank continuous with the deck according to claim 1, characterized in that: The large inclination section and the straight section form an angle R1, where 130° < R1 < 160°.

6. A liquefied gas carrier with a topside tank continuous with the deck according to claim 1, characterized in that: The liquefied gas hull is of a double-bottom, single-hull, single-deck structure.

7. A liquefied gas carrier with a topside tank continuous with the deck according to claim 1, characterized in that: The outer surface of the Type A tank is wrapped with an insulating layer.

8. A liquefied gas carrier with a topside tank continuous with the deck according to claim 4, characterized in that: Several groups of strong frames are respectively provided at intervals on the top inner wall and the bottom inner wall of the Type A tank. The strengthening beam structure is arranged above the strong frames.

9. A liquefied gas carrier with a topside tank continuous with the deck according to claim 1, characterized in that: Rib plates are provided in the wing tank, and multiple stiffeners are provided on the rib plates.

10. A liquefied gas carrier with a topside tank continuous with the deck according to claim 1, characterized in that: An anti-slip structure and an anti-rolling structure are provided between the Type A tank and the hull. An anti-rolling structure is provided at the center of the bottom and the top of the Type A tank respectively.

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