Compact c-type co2 carrier

Abstract

A compact C type CO2 transport ship, two circular cargo holds are arranged in parallel in the cabin inside and the ship width direction, the top of the circular cargo hold is upwardly convex, the top deck of the circular cargo hold is also upwardly convex with the circular cargo hold, a top C type CO2 tank is arranged in the groove formed by the two upwardly convex decks, the saddle of the top C type CO2 tank is made of the deck as the saddle bottom plate, an internal C type CO2 tank is arranged in each of the two circular cargo holds, the saddle of the internal C type CO2 tank is made of the inner bottom of the circular cargo hold as the saddle bottom plate, the longitudinal bulkheads of the two circular cargo holds are enclosed to form a Y type ballast hold with the opening downward, and a first ballast hold is arranged at the bottom of each circular cargo hold correspondingly. The ship rapidity can be improved, and the utilization rate of the cabin can be increased. The convex deck design reduces the waste of deck space, and the deck tank can be placed in the concave position of the deck, so that the gravity center of the deck tank is reduced.

Description

Technical Field

[0001] This invention belongs to the field of ship construction and design, and specifically relates to a compact C-type CO2 transport ship. Background Technology

[0002] Currently, the world's shipping industry mainly uses fossil fuels for propulsion systems, such as heavy oil (HFO) and diesel (MGO). In recent years, low-carbon liquefied fuels such as LNG, LPG, and CNG have gradually emerged. However, these transitional fuels are insufficient to achieve the goal of reducing emissions by at least 50% by 2050, and to strive for a 70% reduction by 2050.

[0003] With the increasing use of low-carbon or carbon-free fuels such as natural gas, ammonia, and hydrogen, and the rise of carbon reduction measures such as transporting carbon dioxide, liquefied gas carriers with C-type compartments are booming. C-type compartments typically come in cylindrical, double-lug, and triple-lug configurations. Cylindrical compartments have lower capacity utilization, but they are simple to manufacture, have strong pressure resistance (capable of withstanding approximately 19 bar), and are relatively inexpensive, making them widely used. Multi-lug compartments, while having higher capacity utilization, are more expensive, more complex to construct, have limited pressure resistance (capable of withstanding approximately 8 bar), and are subject to intellectual property restrictions.

[0004] Carbon dioxide typically requires transportation in a high-pressure, low-temperature environment. However, using double-eared or triple-eared tanks presents challenges due to short pressure holding times and unstable phases. Considering manufacturing capacity and economic factors, using two to three independent C-type tanks for transportation is preferable.

[0005] Traditional liquefied gas carriers have a U-shaped cross-section with double hulls, double bottoms / single bottoms, flat decks, and a single tank. Since the radius of the cargo tank is no more than 5.7m, the utilization rate of the tank capacity is low when the C-type tank is placed in the tank. Moreover, the large size of the cargo tank saddle results in a large structural weight and waste. Summary of the Invention

[0006] To address the above problems, this invention provides a compact C-type CO2 transport ship, the technical solution of which is as follows:

[0007] A compact C-type CO2 transport ship, the ship has a double-layered outer bottom plate and a single-layered outer shell plate. The double-layered outer bottom plate is divided into an upper outer bottom plate and a lower outer bottom plate. The lower outer bottom plate is connected to the outer shell plate by an arc. The outer shell plate gradually slopes outward from bottom to top, forming an angle A1 with the horizontal plane.

[0008] Inside the ship's hold, two circular cargo holds are arranged side by side in the width direction. The top of the circular cargo holds protrudes upwards, and the top deck of the circular cargo holds also protrudes upwards. A top C-shaped CO2 tank is installed in the groove formed by the two upward-protruding decks. The saddle of the top C-shaped CO2 tank is made with the deck as the base plate.

[0009] Each of the two circular cargo holds is equipped with an internal C-type CO2 tank. The saddle of the internal C-type CO2 tank is made with the bottom of the circular cargo hold as the saddle base plate. The longitudinal bulkheads of the two circular cargo holds enclose a Y-shaped ballast tank with the opening facing downwards. A first ballast tank is correspondingly set at the bottom of each circular cargo hold.

[0010] Furthermore, in the aforementioned compact C-type CO2 transport ship, the bottom of the longitudinal bulkhead forms an angle A2.0 with the horizontal plane. <A2=A1<50°。

[0011] Furthermore, in the aforementioned compact C-type CO2 transport ship, the saddle of the internal C-type CO2 tank is entirely arc-shaped and located between the outer shell and the longitudinal bulkhead.

[0012] Furthermore, the aforementioned compact C-type CO2 transport ship has an inner bottom longitudinal girder fixed below the longitudinal bulkhead and between the upper and lower outer bottom plates.

[0013] Furthermore, in the aforementioned compact C-type CO2 carrier, the top deck of the circular cargo hold forms an angle A3, 90° with the horizontal plane. <A3<135°。

[0014] Furthermore, in the aforementioned compact C-type CO2 carrier, the distance from the lowest point of the top deck of the circular cargo hold to the outer bottom plate is D, and the distance from the highest point of the top deck of the circular cargo hold to the lowest point is H3, where H3 < 0.25D.

[0015] Furthermore, in the aforementioned compact C-type CO2 transport ship, the length of the lower bottom plate is equal to the diameter of two internal C-type CO2 tanks.

[0016] Furthermore, in the aforementioned compact C-type CO2 transport ship, the top bulkhead of the first ballast tank is an upper outer bottom plate, and the bottom bulkhead of the first ballast tank is a lower outer bottom plate.

[0017] Furthermore, in the aforementioned compact C-type CO2 carrier, the inner bottom of the circular cargo hold is the upper outer bottom plate.

[0018] This invention employs a sloping outer bottom design, which improves the ship's speed and increases cabin utilization. The two transverse bulkheads within the cabin serve as reinforcement structures for the upper deck tank saddles at their connection to the deck, while the sloping lower section acts as a support structure for the tanks within the cabin. The angle of these bulkheads is similar to the hull's sloping angle, resulting in a more uniform stress distribution on the tank saddles. The single-hull design eliminates the need for side ballast tanks, placing them between the two tanks to compensate for buoyancy lost due to side tilting. The convex deck design reduces wasted deck space and allows the deck tanks to be placed in a concave position on the deck, lowering the tanks' center of gravity. Furthermore, the sloping plates of the convex deck can be used to set up bases, minimizing base waste.

[0019] This type of vessel can install and use multiple cylindrical compartments within one ship, reducing construction costs, simplifying the process, improving the utilization rate of compartment capacity, and making the structure safer. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Among them: 1-lower outer bottom plate, 2-outer shell plate, 4-longitudinal bulkhead, 5-inner bottom longitudinal girder, 6-first ballast tank, 8-Y-type ballast tank, 9-deck, 10-empty tank, 11-circular cargo hold, 12-inner C-type CO2 tank, 13-top C-type CO2 tank, 14-inner C-type CO2 tank saddle, 15-top C-type CO2 tank saddle. Detailed Implementation

[0022] The invention will be further described with reference to the accompanying drawings.

[0023] like Figure 1 The image shows a compact C-type CO2 transport ship. The ship has a double-layered outer bottom plate and a single-layered outer shell plate. The double-layered outer bottom plate consists of an upper outer bottom plate and a lower outer bottom plate. The lower outer bottom plate is connected to the outer shell plate by an arc. The outer shell plate gradually slopes outward from bottom to top, forming an angle A1 with the horizontal plane. <A1<50°。

[0024] Two circular cargo holds are arranged side-by-side along the ship's beam inside the hull. The upper outer floor plate forms the inner floor of the circular cargo holds. The tops of the circular cargo holds bulge upwards, and the top decks of the circular cargo holds also bulge upwards. A top C-type CO2 tank is housed within the recess formed by the two upward-bulging decks. The saddle for the top C-type CO2 tank is made with the deck as its base plate. This saddle is welded between the sloping decks, which helps to reduce the saddle height and distribute the load evenly. Simultaneously, two longitudinal bulkheads extend upwards to the deck, serving as the support structure for the top C-type CO2 tank saddle. Placing the tank within the concave area lowers the tank's center of gravity relative to the baseline, preventing capsizing due to ship rolling. The distance from the lowest point of the top deck of the circular cargo holds to the outer floor plate is D, and the distance from the highest point of the top deck of the circular cargo holds to the lowest point is H3, where H3 < 0.25D. The angle A3 (90°) is formed between the top deck of the circular cargo holds and the horizontal plane. <A3<135°。

[0025] There is an internal C-type CO2 tank in each of the two circular cargo holds. The saddle of the internal C-type CO2 tank is made with the bottom of the circular cargo hold as the saddle bottom plate. The longitudinal bulkheads of the two circular cargo holds enclose a Y-shaped ballast tank with an opening downward. An inner bottom girder is fixed between the upper outer bottom plate and the lower outer bottom plate under the longitudinal bulkhead. The ballast tank in the form of a flared mouth of the Y-shaped ballast tank can move the centroid of the entire hull downward, which is beneficial to the stability of the ship. Since the cargo density of the liquefied gas carrier is relatively light, only changing the outer shape will cause a reduction in the displacement volume. The function of this ballast tank is to compensate for the buoyancy lost due to the side inclination and the cancellation of the side ballast tank. A first ballast tank is correspondingly arranged at the bottom of each circular cargo hold. The top bulkhead of the first ballast tank is the upper outer bottom plate, the bottom bulkhead of the first ballast tank is the lower outer bottom plate, and the side bulkheads are the inner bottom girder and the outer shell respectively to meet the stability requirements. The bottom of the longitudinal bulkhead forms an angle A2 with the horizontal plane, 0 < A2 = A1 < 50°, and the length of the lower bottom plate is equal to the diameters of the two internal C-type CO2 tanks.

[0026] The saddle of the internal C-type CO2 tank is integrally arc-shaped and is located between the outer shell and the longitudinal bulkhead. This saddle is welded between the inclined outer shell plate and the inclined longitudinal bulkhead, which can greatly reduce the height on both sides of the saddle and save structural weight. Since the inclined outer shell plate and the inclined longitudinal bulkhead have the same height and the same inclination angle, the base can be a symmetric structure and can evenly distribute the motion load of the tank body, making the structure safer.

[0027] Two longitudinal bulkheads are provided. The two longitudinal bulkheads are in the form of a flared mouth, with the top perpendicular to the deck and the bottom forming an angle A2 with the horizontal plane, 0 < A2 = A1 < 50°. The folding point height H1 of it is the same as the folding point height of the outer shell plate, 2m < H1 < 0.5D, where D is the molded depth. In order to meet the requirements of damage stability and structural strength, 2 inner bottom girders are provided between the longitudinal bulkhead and the outer bottom plate.

[0028] The ship has a convex deck, which is composed of an inclined side and a horizontal side. The inclined side forms an angle A3 with the horizontal plane of the molded depth, 90° < A3 < 135°. The distance from the highest point to the lowest point of the deck is H3, H3 < 0.25D. Below the convex deck, two void spaces are provided in the hold, and these void spaces can be used as maintenance passages. Anti-floating loadings are installed outside the void spaces. The area enclosed by the convex deck, the outer shell, the upper outer bottom plate, and the longitudinal bulkhead is the circular cargo hold of the liquefied gas carrier, and 1 internal C-type CO2 tank is provided in each circular cargo hold.

[0029] The ship of the present invention can load three C-type tanks with a maximum radius of 5. meters at the same time, and the loading capacity is increased by 3 times, while the molded width is only increased by less than 1.5 times of the traditional scheme. Due to the convex deck design, the void space at the top of the side can be cancelled. The inclined bottom design plus the flared mouth ballast tank design can reduce a large amount of structural weight.

[0030] The C-type tanks on the deck can be selected according to the actual situation, or they can be omitted or replaced with fuel tanks, such as LNG.

[0031] The width of the straight section of the outer bottom plate is B2, which is approximately the diameter of two tanks. When the diameter of the cargo tank inside the cargo hold decreases, the width also decreases. When the inclination angle and the deck inclination angle maintain a certain distance from the cargo tank, they should be set tangentially as much as possible to maintain coordination.

[0032] This patented cargo tank has a compact layout and low structural weight. It can transport carbon dioxide simultaneously with three tanks, and it can also avoid the patent barriers and insufficient pressure of three-eared tanks, as well as the problem of excessive structural weight when three tanks are placed in parallel.

Claims

1. A compact C-type CO2 transport ship, characterized in that: The ship has a double - layer outer bottom plate and a single - layer outer shell plate. The double - layer outer bottom plate is divided into an upper outer bottom plate and a lower outer bottom plate. The lower outer bottom plate is arc - connected to the outer shell plate. The outer shell plate gradually slopes outward from bottom to top, forming an angle A1 with the horizontal plane. Inside the cabin, two circular cargo holds are arranged side by side in the ship width direction. The top of the circular cargo hold bulges upward, and the deck at the top of the circular cargo hold also bulges upward. A top C - type CO2 tank is arranged in the groove formed by the two upward - bulging decks. The saddle of the top C - type CO2 tank is made with the deck as the saddle bottom plate; the saddle of the internal C - type CO2 tank is integrally arc - shaped and is located between the outer shell and the longitudinal bulkhead. Each of the two circular cargo holds is provided with an internal C - type CO2 tank. The saddle of the internal C - type CO2 tank is made with the inner bottom of the circular cargo hold as the saddle bottom plate. The longitudinal bulkheads of the two circular cargo holds enclose a Y - shaped ballast tank with an opening downward, and a first ballast tank is correspondingly arranged at the bottom of each circular cargo hold. The bottom of the longitudinal bulkhead forms an angle A2 with the horizontal plane, where 0 < A2 = A1 < 50°. The folding point height H1 is the same as the folding point height of the outer shell plate, and 2m < H1 < 0.5D, where D is the molded depth. The deck at the top of the circular cargo hold forms an angle A3 with the horizontal plane, where 90° < A3 < 135°. The distance from the lowest point of the deck at the top of the circular cargo hold to the outer bottom plate is D, and the distance from the highest point to the lowest point of the deck at the top of the circular cargo hold is H3, where H3 < 0.25D.

2. A compact C-type CO2 transport ship according to claim 1, characterized in that: An inner bottom girder (5) is fixed between the upper outer bottom plate and the lower outer bottom plate under the longitudinal bulkhead.

3. A compact C-type CO2 transport ship according to claim 1, characterized in that: The length of the lower bottom plate is equal to the diameters of the two internal C - type CO2 tanks.

4. A compact C-type CO2 transport ship according to claim 1, characterized in that: The top bulkhead of the first ballast tank is the upper outer bottom plate, and the bottom bulkhead of the first ballast tank is the lower outer bottom plate.

5. A compact C-type CO2 transport ship according to claim 1, characterized in that: The inner bottom of the circular cargo hold is the upper outer bottom plate.

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