Marine LNG tank vertical mounting structure

Abstract

A kind of LNG storage tank vertical installation structure of ship, including vertical fixed on the hull tank body, peripheral anti-tilting anti-rotation device, load-bearing mounting device and expansion joint, stress generated by temperature field change or ship vibration is absorbed by expansion joint;Anti-tilting anti-rotation device is installed on the tank body, can prevent the rotation of storage tank in the process of ship travel due to uneven stress;Load-bearing mounting device bears the weight of overall storage tank and FGSS ROOM, is responsible for the connection of overall and ship, the structure will vertical storage tank be stably and conveniently installed on ship, vertical installation mode is more flexible, vertical installation, sway has less influence on liquid level, stress generated by temperature field change or ship vibration is absorbed by expansion joint, can avoid the harm of gas supply system equipment, system has the characteristics of stable and reliable, device simple, reduce cost.

Description

Technical Field

[0001] This invention relates to the field of liquefied gas storage tanks in marine fuel supply systems, specifically a vertical installation structure for a marine LNG storage tank. Background Technology

[0002] With the development of international shipping and ocean-going vessel transportation, exhaust emissions from diesel-powered ship engines have become a major source of pollution in the ocean, especially in port areas. The International Maritime Organization (IMO) has increasingly stringent requirements for SOx and NOx emissions, designating Emission Control Areas (ECAs) for these emissions. According to the regulations of the IMO and relevant countries and regions, ships that do not meet the emission regulations for the corresponding marine areas are not permitted to navigate within those areas. Current solutions for reducing NOx and SOx emissions from ship diesel engines include using dual-fuel main engines powered by LNG. LNG combustion produces no NOx or SOx, and the dual-fuel main engine relies on an Intelligent Fuel Gas Supply System (iGAS) for operation.

[0003] The dual-fuel engine gas supply system primarily transforms liquefied LNG into fuel gas that meets the intake requirements of a dual-fuel engine through processes such as pressurization and vaporization. The main equipment includes storage tanks, transfer pumps, carburetors, heaters, booster pumps, and compressors. The storage tank is the core storage device. Due to its inherent physical properties, LNG has a boiling point of -165℃, making it difficult to store and requiring LNG storage tanks. LNG storage tanks are mainly divided into single-walled tanks and double-walled tanks. A single-walled tank consists of a single layer of insulation material covering the tank body, isolating the stored substance from external heat exchange. A double-walled tank consists of two tank bodies, with the space between the two layers either vacuum-insulated or filled with perlite insulation. Due to the structural characteristics of the two types of tanks, under the same conditions, single-walled tanks use less material, have lower costs, and occupy less space, and are mostly used for medium to large-sized tanks; double-walled tanks use more material, have higher costs, and occupy more space, and are mostly used for small to medium-sized tanks.

[0004] Nowadays, large double-walled tanks are commonly used on ocean-going vessels. The main method of placement is horizontal saddle support, with the outer shell covered with insulation material for heat insulation. They are placed on the open deck or separately below the deck. The installation method is relatively simple. Due to the horizontal installation, the liquid level in the tank needs to be maintained at a minimum of 10% to 20%. There is a lot of residual liquid in the horizontal installation. Furthermore, when the ship encounters wind and waves during navigation, the ship will experience violent rocking, and the liquid level in the tank will be uneven, which may lead to damage or paralysis of the gas supply system equipment. Summary of the Invention

[0005] The purpose of this invention is to address the problem that existing horizontal storage tanks may be damaged due to inherent structural issues in their installation methods. This invention proposes a vertical installation structure for marine LNG storage tanks. This structure allows for stable and convenient installation of the vertical storage tank on a ship. The vertical installation method is more flexible, and because it is vertical, swaying has less impact on the liquid level, avoiding damage to the gas supply system equipment. This achieves the effects of system stability and reliability, simple device design, and reduced costs.

[0006] The technical solution of the present invention is as follows:

[0007] A vertical installation structure for a marine LNG storage tank includes a tank body vertically fixed to the hull. Its features include: an outer anti-roll and anti-rotation device composed of an upper anti-rotation and anti-tilt device, a middle anti-rotation and anti-tilt device, and a lower anti-rotation and anti-tilt device; a load-bearing installation device composed of an upper steel plate structure and a lower casting; and an expansion joint with bottom reinforcing ribs. The tank body is divided into three sections from top to bottom.

[0008] The top of the storage tank is welded together with a cylindrical top and a head, and the cylindrical top is located above the center of the head. The expansion joint covers the outside of the cylindrical top, and the reinforcing rib is welded to the cylindrical top to form the upper installation structure.

[0009] The upper steel plate structural component is welded to the outer side of the upper middle part of the storage tank body, the lower casting is welded to the lower side of the upper steel plate structural component, the middle anti-tilt and anti-rotation device is welded to the storage tank body and corresponds to the upper steel plate structural component, and the upper anti-tilt and anti-rotation device is welded to the middle anti-tilt and anti-rotation device, forming a middle section installation structure;

[0010] The lower anti-tilting and anti-rotation device is welded to the lower outer side of the storage tank body, forming the lower installation structure.

[0011] The upper anti-tilt and anti-rotation device, the middle anti-tilt and anti-rotation device and the lower anti-tilt and anti-rotation device are all rigid structural components.

[0012] The external anti-tilt and anti-rotation device and the load-bearing installation device are connected to the hull. The transmission pipeline enters the storage tank through the cylindrical top of the storage tank and is fixed to the upper end cap of the storage tank or the vertical support inside the tank. The cylindrical top of the storage tank is connected to the gas supply chamber (FGSS ROOM) of the LNG gas supply system through the expansion joint.

[0013] Compared with the prior art, the technical effects of the present invention are as follows:

[0014] This invention achieves convenient and stable installation through a fixed LNG storage tank device and installation structure. The expansion joint absorbs the stress caused by temperature field changes or ship vibration. The anti-tilting and anti-rotation device installed on the tank body can prevent the tank from rotating due to uneven force during the ship's movement. The load-bearing installation device bears the weight of the entire tank and the FGSS ROOM and is responsible for connecting the whole to the ship. Attached Figure Description

[0015] Figure 1 This is an overall outline drawing of the invention.

[0016] Figure 2 for Figure 1 AA section diagram

[0017] Figure 3 This is a partial outline drawing of the expansion joint 3 of the present invention.

[0018] Figure 4 for Figure 1 Top view

[0019] Figure 5 for Figure 1 CC section view Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Please see Figure 1As shown in the figure, the present invention relates to a vertical installation structure for a marine LNG storage tank. The tank is installed perpendicular to the horizontal line. The LNG storage tank includes a tank body 0, which is vertically fixed to the hull. The cylindrical top 01 of the tank body 0 is located above the middle of the upper end cap 02 of the tank. The installation structure includes: an external anti-tilting and anti-rotation device 1, a load-bearing installation device 2, and an expansion joint 3.

[0024] The peripheral anti-tilt and anti-rotation device 1 includes an upper anti-rotation and anti-tilt device 11, a middle anti-rotation and anti-tilt device 12, and a lower anti-rotation and anti-tilt device 13;

[0025] The load-bearing installation device 2 is divided into an upper steel plate structure 21 and a lower casting 22;

[0026] The expansion joint 3 includes a base and a reinforcing rib plate 31;

[0027] The base and reinforcing rib plate 31 of the expansion joint 3 are welded to the dome structure 01. The upper anti-tilt and anti-rotation device 11, the middle anti-tilt and anti-rotation device 12 and the lower anti-tilt and anti-rotation device 13 are all rigid structural components and are welded to the storage tank 0. The middle anti-tilt and anti-rotation device 12 and the lower anti-tilt and anti-rotation device 13 are welded to the storage tank 0. The upper anti-tilt and anti-rotation device 11 is welded to the middle anti-tilt and anti-rotation device 11 and is not connected to the storage tank 0.

[0028] The external anti-tilt and anti-rotation device 1 and the load-bearing installation device 2 are connected to the hull. The transmission pipeline enters the storage tank 0 through the cylindrical top 01 of the storage tank 0 and is fixed to the upper end cap 02 of the storage tank or the vertical support inside the tank. The cylindrical top 01 of the storage tank is connected to the gas supply chamber (FGSS ROOM) of the LNG gas supply system through the expansion joint 3.

[0029] The tank body has three installation structures: the top dome structure 01 has an expansion joint 3 and a reinforcing rib 31 installed thereon, the expansion joint 3 supports the external FGSS ROOM, the middle section has an anti-rotation and anti-tilting device 12 and a load-bearing device 2, and the bottom section has an anti-rotation and anti-tilting device 13.

[0030] The specific principle of this installation method is as follows: The storage tank is a storage device. The expansion joint 3 is welded to the platform with reinforcing ribs below the DOME. The temperature resistance range is -196℃ to 100℃. It can withstand LNG splash and liquid nitrogen splash without becoming brittle or deforming. The FGSS ROOM is welded to the upper end of the expansion joint 3. After the equipment in the FGSS ROOM is installed, the storage tank is filled and the cryogenic liquid transportation begins. The storage tank and each piece of equipment will shrink due to low temperature, resulting in high internal stress. Rigid connections can lead to tearing. After installing the expansion joint 3, this part of the cryogenic internal stress can be effectively absorbed.

[0031] The aforementioned central anti-tilting and anti-rotation device 1 is a rigid structural component, welded to the tank body 0. The upper component 1 is welded to the load-bearing device 2, and is securely fixed. It can prevent the tank from tilting or rotating due to ship swaying, and prevent the tank and its connected pipelines or equipment from breaking or deforming due to stress. The load-bearing device 2 consists of an upper welded structural component 21 and a lower casting 22. The upper welded structural component 21 is welded to the tank using steel plates, which saves materials and provides good load-bearing performance. The lower casting 22 is only welded to the upper structural component 21 and is not connected to the tank. When bearing load, it can ensure that the weight of the tank is evenly distributed throughout the entire load-bearing device.

[0032] The lower anti-tilting and anti-rotation device 13 is a rigid structural component that is welded to the storage tank and can also prevent the storage tank from rotating due to the swaying of the ship.

[0033] Experiments show that this invention absorbs stress caused by temperature field changes or ship vibration through expansion joints; the anti-tilting and anti-rotation device installed on the tank body can prevent the tank from rotating due to uneven force during ship movement; the load-bearing installation device bears the weight of the entire tank and FGSS ROOM and is responsible for connecting the whole to the ship. This structure allows for stable and convenient installation of the vertical tank on the ship. The vertical installation method is more flexible, and the impact of swaying on the liquid level is smaller. By absorbing stress caused by temperature field changes or ship vibration through expansion joints, damage to the gas supply system equipment can be avoided. The system is stable and reliable, simple to install, and reduces costs.

Claims

1. A vertical installation structure for a marine LNG storage tank, comprising a storage tank (0) vertically fixed to the hull, characterized in that: It also includes an outer anti-tilting and anti-rotation device (1) consisting of an upper anti-rotation and anti-tilting device (11), a middle anti-rotation and anti-tilting device (12), and a lower anti-rotation and anti-tilting device (13); a load-bearing installation device (2) consisting of an upper steel plate structural component (21) and a lower casting (22); and an expansion joint (3) with a bottom reinforcing rib plate (31); the tank body (0) is divided into three installation sections from top to bottom: The top of the tank body (0) is welded together with a cylindrical top (01) and a head (02), and the cylindrical top (01) is located above the center of the head (02). The expansion joint (3) is pressed over the cylindrical top (01), and the reinforcing rib (31) is welded to the cylindrical top (01) to form the upper installation structure. The upper steel plate structural component (21) is welded to the upper outer side of the storage tank body (0), the lower casting (22) is welded to the lower side of the upper steel plate structural component (21), the middle anti-rotation and anti-tilt device (12) is welded to the storage tank body (0) and corresponds to the upper steel plate structural component (21), and the upper anti-rotation and anti-tilt device (11) is welded to the middle anti-rotation and anti-tilt device (12), forming a middle section installation structure; The lower anti-rotation and anti-tilt device (13) is welded to the lower outer side of the storage tank (0) to form the lower installation structure.

2. The vertical installation structure for marine LNG storage tanks according to claim 1, characterized in that: The upper anti-rotation and anti-tilt device (11), the middle anti-rotation and anti-tilt device (12) and the lower anti-rotation and anti-tilt device (13) are all rigid structural components.

3. The vertical installation structure for marine LNG storage tanks according to claim 1 or 2, characterized in that: The external anti-tilt and anti-rotation device (1) and the load-bearing installation device (2) are connected to the hull. The transmission pipeline enters the storage tank (0) through the cylindrical top (01) and is fixed on the end cap (02) and the support perpendicular to the inside of the tank. The cylindrical top (01) is connected to the gas supply chamber of the LNG gas supply system through the expansion joint (3).

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