A new type of B-type independent storage tank

Abstract

A new type of B-type independent tank, the B-type tank is arranged in the hull structure, and a support layer is arranged between the main barrier wall of the B-type tank and the hull structure, and the support layer includes a top support mechanism, a lateral support mechanism and a vertical support mechanism. A secondary barrier wall is also arranged between the bottom of the B-type tank, the main barrier wall and the hull structure. The shape of the secondary barrier wall is the same as the external contour structure of the bottom of the B-type tank. There is a gap between the secondary barrier wall and the main barrier wall and the hull structure, and it is supported and fixed by the vertical support mechanism. The secondary barrier wall divides the main barrier wall and the hull structure into two areas, and the main barrier wall, the secondary barrier wall and the bottom plate of the ship are inspected and repaired through the divided areas. The inner surface of the secondary barrier wall is covered with a first anti-bend layer. The present invention eliminates the risk factors of leakage of the B-type tank. Even if the B-type tank leaks due to unavoidable reasons, the technical solution of the present invention can also achieve the effect of timely solving the leakage of liquefied gas and avoiding more damage and loss to the hull structure.

Description

Technical Field

[0001] The present invention relates to the technical field of ships and marine structures, and in particular to a B-type storage tank with a more stable and safer independent secondary barrier structure. Background Art

[0002] The International Maritime Organization (IMO) has clearly defined the function and definition of Type B independent storage tanks (hereinafter referred to as "Type B tanks") in its "International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk" (IGC Code) and "International Code of Safety for Ships Using Gases or Other Low Flashpoint Fuels" (IGF Code). Type B tanks are mostly used in large ships and marine engineering structures. Their functions include but are not limited to transporting liquefied gases and being used as liquefied gas fuel tanks. The liquefied gases they carry include but are not limited to liquefied natural gas (LNG), liquid ammonia fuel (NH3), liquefied ethylene gas (LEG), etc.

[0003] According to the IMO IGF / IGC regulations, Type B tanks need to be equipped with partial secondary barriers with small leakage protection systems. Traditional Type B tanks are only equipped with supporting structures at the bottom. During the voyage, the ship will roll or pitch, and the shaking of the ship will affect the tank, causing the tank to shake as well, increasing the risk of liquefied gas leakage.

[0004] like Figure 1 , 2 As shown in Figure 3, the traditional B-type storage tank is mainly divided into three forms, namely: ① a splash-proof membrane 10 is arranged outside the main shield wall; ② a liquid collecting tank 11 is arranged outside the hull structure; ③ a splash-proof membrane and a liquid collecting tank are arranged outside the main shield wall. A sealed space is formed between the main shield wall and the splash-proof membrane of the traditional storage tank, and the insulating layer outside the sealed space is adhered to the inner shell of the hull. There is a leakage receiving groove on the main shield wall of the traditional B-type storage tank, and it drips directly onto the inner shell of the hull. A liquid collecting tank is installed on the outside of the inner shell of the hull, and a drainage pipe is led out from the sealed space and connected to the liquid collecting tank. The splash-proof membrane and the main shield wall of this scheme form a fully enclosed sealed space, which is difficult to inspect and maintain. The hull structure is directly exposed to the low-temperature leaked liquid, which has a relatively large safety risk and requires extremely high steel for the hull structure.

[0005] The liquid collecting tank of the traditional B-type tank is suspended in the air and is only connected to the main barrier wall by a drainage pipe, which is easy to be damaged during the movement of the ship. The joint between the splash membrane of the traditional B-type tank and the main barrier wall or hull structure is always at high risk throughout the life cycle of the ship. Fatigue damage, crack propagation and low temperature are all safety challenges faced by this area. It is difficult to detect and repair, making the construction and maintenance difficult and costly. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a new type of B-type independent storage tank, which aims to achieve the structural stability of the B-type storage tank during the transportation of liquefied gas, ensure transportation safety and prevent liquefied gas leakage. The technical solution adopted is:

[0007] A new type of B-type independent storage tank, the B-type storage tank is arranged in the hull structure, a supporting layer is arranged between the main screen wall of the B-type storage tank and the hull structure, the supporting layer includes a top supporting mechanism, a lateral supporting mechanism and a vertical supporting mechanism, and the B-type storage tank is fixed in the hull structure through the supporting layer.

[0008] The support layer is used to fix the B-type tank support in the hull structure, and the tank is fixed in all directions up, down, left and right, thereby ensuring the safety of the B-type tank during transportation. When the ship rolls or pitches, the top support mechanism is combined with the vertical support mechanism, and the two rows of lateral support mechanisms are combined to provide longitudinal and lateral constraints respectively, so that the B-type tank will not shake due to rolling or pitching, ensuring the stability of the B-type tank, thereby avoiding the leakage of liquefied gas in the B-type tank. The lateral support mechanisms on both sides of the main screen are symmetrically arranged, so that the forces on both sides of the B-type tank are symmetrical. The top support mechanism cooperates with the vertical support mechanism to limit the swaying of the B-type tank in the longitudinal direction, and the lateral support mechanisms on both sides cooperate to limit the swaying of the B-type tank in the lateral direction, thereby ensuring the safety of liquefied gas transportation. The main screen can be made of metal materials with low temperature performance such as stainless steel, 9% Ni steel, high manganese low temperature steel, and aluminum alloy.

[0009] The longitudinal direction of the Type B tank is the same as the longitudinal direction of the hull and the marine engineering structure, that is, its length direction.

[0010] The transverse direction of the B-type tank is the same as the transverse direction of the hull and marine engineering structure, that is, its width direction.

[0011] The vertical direction of the B-type tank is the same as the vertical direction of the hull and marine engineering structure, that is, its height direction.

[0012] The supporting layer of the present invention not only supports the B-type tank, but also mainly performs preliminary protection on the B-type tank, stabilizes the B-type tank inside the hull structure, applies all-round force to the B-type tank, clamps the B-type tank, and prevents leakage of liquefied gas. The top support mechanism corresponds to the vertical support mechanism, and the lateral support mechanisms on both sides correspond to each other. By adopting this symmetrical force application and point-to-point force clamping structure, the maximum stabilization effect can be achieved with less construction materials, saving construction materials and reducing construction costs.

[0013] A secondary barrier is also provided between the bottom of the B-type tank, the main barrier and the hull structure. The secondary barrier has the same shape as the bottom and external contour structure of the B-type tank, and wraps the bottom of the B-type tank. The highest point of the secondary barrier top is equal to or higher than the highest point of the B-type tank cut. The secondary barrier is fixedly connected to the hull structure through a transition mechanism. The secondary barrier is fixed between the main barrier and the hull structure through a vertical support mechanism. The highest point of the secondary barrier top is 800-1000mm above the highest point of the B-type tank cut. The secondary barrier is independently provided between the main barrier and the hull structure. Its shape is the same as the external contour structure of the bottom of the ship. It plays the role of protecting the main barrier and containing the leaked liquefied gas. This structure meets the relevant provisions of IMO IGF / IGC while reducing the need to set up leakage protection devices or cryogenic liquid handling devices. When the liquefied gas in the tank leaks, it passes through the main barrier and flows into the secondary barrier along the outer surface of the main barrier. The secondary barrier is placed at the bottom of the B-type tank like a bowl to receive the leaked liquefied gas.

[0014] The movement of the hull will produce shaking, and the lateral or longitudinal shaking of the ship will produce a certain inclination angle. When the ship forms an inclination angle, the part of the secondary barrier wall that is higher than the bevel can also completely wrap the bottom of the main barrier wall to protect the main barrier wall and deal with liquefied gas leakage.

[0015] A circle of transition mechanisms are arranged at equal intervals along the edge of the top of the secondary screen wall. The transition mechanism has a special-shaped steel structure platform, one end of the steel structure platform is welded to the hull structure, and the other end is welded to a steel clamping member. The steel clamping member is a square groove with an opening on one side, the groove opening is downward, and the inside is filled with laminated wood. The top of the secondary screen wall is inserted into the laminated wood for fixing. The width of the laminated wood block is preferably but not limited to 300-400mm. The stability of the top of the secondary screen wall is enhanced by the transition mechanism. At the same time, the transition mechanism can also be used as a maintenance platform. A ladder is set on the transition mechanism, and the operator enters the space between the secondary screen wall and the hull structure and the main screen wall through the ladder. The width of the steel structure platform is preferably but not limited to 800-1000mm. The width of 800-1000mm is used to facilitate the setting up of the ladder on the steel structure platform.

[0016] The secondary screen wall divides the area between the main screen wall and the hull structure into two areas. The outer surface of the main screen wall and the inner surface of the secondary screen wall form a first area, and the outer surface of the secondary screen wall and the inner surface of the hull structure form a second area. Operators can enter the first area or the second area to inspect and repair the equipment in the first area or the second area. A gas leakage detection device can be set in the first area, and inert gas can be filled in the first area and the second area. The secondary screen wall adopts a thin plate structure, and its thickness is not greater than the plate thickness of the main screen wall. Its thickness is preferably but not limited to 10mm-15mm. The main function of the secondary screen wall is to serve as a receiving tank for small leaked liquids, protect the hull structure from the influence of cryogenic liquids, and only conduct mechanical loads in the force mechanism. Therefore, it can be set in the form of a thin plate, thereby optimizing the structural weight and saving costs.

[0017] The inner surface of the secondary screen wall is covered with a first anti-bend layer, which is a T-shaped material. The T-shaped material is welded to the inner surface of the secondary screen wall. The horizontal and vertical lines of the T-shaped material intersect to form an overall grid type. This grid type structure makes the inner surface of the secondary screen wall evenly stressed, and then the secondary screen wall can be controlled as a whole to prevent it from shrinking and deforming due to cold. In addition, it is ensured that in the event of liquid leakage, the liquefied gas can be better contained. Even if the B-type tank leaks, the safety of the B-type tank can be guaranteed, providing a protection measure for the B-type tank, allowing maintenance personnel to repair the main screen wall as soon as possible, stop leakage, reduce the risk factor, and reduce losses.

[0018] A row of top support mechanisms is arranged at the top of the main screen wall along the length direction of the B-type storage tank; a row of lateral support mechanisms is arranged on both sides of the main screen wall along the height direction of the B-type storage tank; and multiple rows of vertical support mechanisms are arranged at the bottom of the main screen wall along the length direction of the B-type storage tank. The overall support layer formed by the top support mechanism, the vertical support mechanism, and the lateral support mechanism firmly fixes and clamps the B-type storage tank in the middle of the hull structure, ensuring that the B-type storage tank will not be affected by the rolling, pitching or other external impacts of the ship, protecting the B-type storage tank and avoiding the leakage of liquefied gas. A row of top support mechanisms is arranged at the top of the main screen wall, and multiple top support mechanisms are arranged at equal intervals along the length direction of the B-type storage tank. A row of lateral support mechanisms is arranged on both sides of the main screen wall along the height direction of the B-type storage tank, and the lateral support mechanisms are arranged at equal intervals. Multiple rows of vertical support mechanisms are arranged at the bottom of the main screen wall along the length direction of the B-type storage tank, and the vertical support mechanisms are arranged at equal intervals. The top support mechanism, the lateral support mechanism and the vertical support mechanism are respectively fixed on the top, the side and the bottom of the main screen wall in a modular form to form an integral support layer.

[0019] The distance between the secondary barrier and the main barrier is 950-1050mm, and the distance between the secondary barrier and the hull structure is 650-750mm. That is, the spacing of the first area is 950-1050mm, and the spacing of the second area is 650-750mm. The two areas are set to facilitate the inspection personnel to enter the hull structure, to facilitate the inspection of the outer surface of the main barrier of the B-type tank and the inner surface of the secondary barrier, to monitor the outer surface of the main barrier in real time, and to repair it in time if there is any abnormality, so that the problem can be solved before the liquefied gas leaks, thus avoiding the leakage of liquefied gas.

[0020] In the above-mentioned novel B-type independent storage tank, further, the outer surface of the B-type storage tank is covered with an insulating layer. The insulating layer is in contact with the outer surface of the main screen wall, and the insulating layer is adhered to the outer surface of the main screen wall. A complete wrapping layer of a certain thickness is formed on the outside of the B-type storage tank, which has the effect of heat preservation and heat insulation.

[0021] The support layer set between the main barrier and the hull structure, as well as the second anti-buckling layer and strong frame structure set on the inner surface of the main barrier, provide advance protection for the B-type tanks and eliminate the risk factors that may cause leakage to the B-type tanks. The structural setting of the independent secondary barrier and the first anti-buckling layer in the secondary barrier divide the space between the bottom of the B-type tank and the hull structure into two parts, so that there is enough space between the B-type tank and the hull structure, and the main barrier, secondary barrier and hull structure can be inspected and repaired at any time, and problems can be discovered and solved in time.

[0022] The structure of the present invention eliminates the risk factors of leakage in the B-type tank, and even if the B-type tank leaks due to unavoidable reasons, the technical solution of the present invention can achieve the effect of promptly resolving the leakage of liquefied gas and avoiding further damage and loss to the hull structure caused by the leakage of liquefied gas.

[0023] The beneficial effects of the present invention are:

[0024] As an independent structure, the secondary barrier is located between the main barrier and the hull structure and has a maintenance space that meets the requirements during operation and maintenance, making it convenient for personnel to enter and exit to check and maintain the operating status of the main barrier, secondary barrier and supporting structure, which is beneficial to structural safety and maintainability.

[0025] Separating the secondary barrier from the main barrier or the surface of the hull structure releases the local stress at the connection between the secondary barrier and the surrounding structure, greatly reducing the impact of hull movement or mechanical vibration on the safety of the secondary barrier structure.

[0026] The secondary screen wall itself serves as a drip tray for leaking liquid. It has a large coverage area and can flexibly handle the dripping cryogenic liquid. If the leakage is small, the drip flow itself can evaporate into gas in the internal space enclosed by the primary screen wall and the secondary screen wall. If the leakage is large, the secondary screen wall itself can store the leaked liquid for a certain period of time, which can save time for subsequent maintenance and emergency treatment. In addition, the traditional form of secondary screen wall lacks sufficient maintenance space and requires the installation of an additional leaking liquid collection and treatment system, which also significantly increases the cost of construction and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of a traditional B-type tank with a splash-proof membrane;

[0028] Figure 2 It is a schematic diagram of the structure of a conventional B-type tank with a liquid collecting tank;

[0029] Figure 3 It is a schematic diagram of the structure of a conventional B-type tank with a splash-proof membrane and a liquid collecting tank;

[0030] Figure 4 A schematic diagram of the front structure of the storage tank and the hull structure of the present invention;

[0031] Figure 5 The present invention Figure 4 Schematic diagram of the AA section structure;

[0032] Figure 6 It is a schematic diagram of the main structure of the transition mechanism;

[0033] Figure 7 It is a schematic diagram of the structure of the transition mechanism viewed from above;

[0034] Figure 8 The secondary barrier wall is in a form where the two side walls are perpendicular to the bottom. The highest point of this type of secondary barrier wall is higher than the highest point of the B-type tank cut. The main structural diagram is connected to the hull structure through a transition mechanism.

[0035] Fig. 9 The secondary barrier wall is in a form where the two side walls are perpendicular to the bottom. The highest point of this type of secondary barrier wall is higher than the highest point of the B-type tank cut. It is a side view of the structure connected to the hull structure through a transition mechanism.

[0036] Fig.10 The angle between the two side walls of the secondary barrier and the bottom is an obtuse angle. The highest point of this type of secondary barrier is higher than the highest point of the B-type tank cut. The main structural diagram is connected to the hull structure through a transition mechanism;

[0037] Fig.11 The angle between the two side walls of the secondary barrier and the bottom is an obtuse angle. The highest point of this type of secondary barrier is higher than the highest point of the B-type tank cut. It is a side view of the structure connected to the hull structure through a transition mechanism;

[0038] Fig.12 yes Fig. 9 , Fig.10 , Fig.11 , Fig.12 A schematic diagram of a top view structure;

[0039] Fig.13 The secondary barrier wall is in a form where the two side walls are perpendicular to the bottom. The highest point of the secondary barrier wall in this form is equal to the highest point of the B-type tank cut, and the main structural diagram is connected to the hull structure through a transition mechanism;

[0040] Fig.14 The secondary barrier wall is in a form where both side walls are perpendicular to the bottom. The highest point of the secondary barrier wall in this form is equal to the highest point of the B-type tank cut. It is a side view structural diagram connected to the hull structure through a transition mechanism.

[0041] Fig.15 The angle between the two side walls of the secondary barrier and the bottom is an obtuse angle. The highest point of this type of secondary barrier is equal to the highest point of the B-type tank cut. The main structural diagram is connected to the hull structure through a transition mechanism;

[0042] Fig.16 The angle between the two side walls of the secondary barrier and the bottom is an obtuse angle. The highest point of this type of secondary barrier is equal to the highest point of the B-type tank cut. It is a side view of the structure connected to the hull structure through a transition mechanism;

[0043] Fig.17 yes Fig.13 , Fig.14 , Fig.15 , Fig.16 Schematic diagram of the structure from top view;

[0044] Fig.18 The highest point of the secondary barrier wall is equal to the highest point of the B-type tank cut, and the schematic diagram of the connection structure between the top of the secondary barrier wall and the transition mechanism;

[0045] Among them: 2-hull structure, 3-main screen wall, 4-secondary screen wall, 5-top support mechanism, 6-lateral support mechanism, 7-bottom support mechanism, 8-insulation layer, 9-T profile, 10-splash membrane, 11-liquid collecting tank, 12-strong frame, 51-laminated wood, 52-clamping member, 53-toggle plate, 54-steel structure platform. DETAILED DESCRIPTION

[0046] Example 1

[0047] The present invention will be further described with reference to the accompanying drawings. Figure 4 , 5A new type of B-type independent tank is shown, which has a B-type tank 1 with a main barrier wall 3. The main barrier wall is made of stainless steel metal material. The B-type tank is arranged in the hull structure 2. A support layer is arranged between the hull structure and the main barrier wall. The B-type tank is fixed in the hull structure through the support layer. At the bottom of the B-type tank, a secondary barrier wall 4 is also arranged between the main barrier wall and the hull structure. The shape of the secondary barrier wall is the same as the bottom and external contour of the B-type tank (such as Figure 8 , 9 , 10, 11, 13, 14, 15, 16), the highest point of the secondary barrier top is located 900mm above the highest point of the B-type tank cut, one end of the transition mechanism is welded to the hull structure, and the other end is connected to the top of the secondary barrier. Along the top edge of the secondary barrier, a circle of transition mechanisms (such as Fig.12 , 17 As shown in Figure 6 , 7 As shown, the transition mechanism is provided with a special-shaped steel structure platform 54, and the width of the steel structure platform is 900mm. With this width, a ladder can be set up on the steel structure platform, so that construction personnel can enter the area between the hull structure and the main screen wall along the ladder. One end of the steel structure platform is welded to the hull structure, and the other end is welded with a steel clamping member 52. The clamping member is a square groove with an opening on one side. The opening of the clamping member is downward, and the inside is filled with laminated wood 51. The laminated wood and the groove of the clamping member are fixed by adhesive. The top of the secondary screen wall is inserted into the laminated wood and fixed by adhesive. A toggle plate 53 is welded at the connection between the steel structure platform and the hull structure to enhance the stability of the structure. There is an oblique transition between the clamping member and the steel structure platform to achieve width change. The flexible connection between the laminated wood and the steel structure is used to prevent the load of the hull structure from being transferred to the secondary screen wall. This can not only enhance the stability of the side wall of the secondary screen wall, but also avoid the large hull load directly acting on the thin plate of the secondary screen wall.

[0048] The support layer is an integral support layer composed of a top support mechanism 5, a lateral support mechanism 6, and a vertical support mechanism 7. The top support mechanism is arranged at the top of the main screen wall, and a row of top support mechanisms are arranged along the center line of the length direction of the B-type storage tank. The top support mechanism is rectangular as a whole, and it spans the strong frame 12 of the B-type storage tank and is perpendicular to the center line of the length direction of the B-type storage tank. The top support mechanism increases the strength support and holding area of ​​the top of the B-type storage tank, enhances the holding strength of the top of the B-type storage tank, and more effectively controls the B-type storage tank.

[0049] Multiple rows of vertical support mechanisms are arranged at the bottom of the main screen wall and on both sides of the center line of the length direction of the B-type storage tank. The vertical support mechanism is located at the strong frame 12 at the bottom of the B-type storage tank. The top support mechanism corresponds to the vertical support mechanism, which ensures that the holding force at the top of the B-type storage tank corresponds to the holding force at the bottom. The corresponding forces applied from top to bottom can more effectively fix and support the B-type storage tank. The top support mechanism cooperates with the vertical support mechanism to effectively fix the B-type storage tank.

[0050] On both sides of the main screen wall, along the center line of the height direction of the main screen wall, a row of lateral support mechanisms are arranged, and the lateral support mechanisms are rectangular as a whole, straddling the longitudinal strong frame structure 12, and perpendicular to the center line of the height direction. A row of lateral support mechanisms are arranged on the center line of the height direction of both sides of the B-type storage tank, and the lateral support mechanisms straddle the longitudinal strong frame structure horizontally. This structure increases the force support and holding area of ​​the lateral support mechanisms on the side of the B-type storage tank, and then effectively fixes the B-type storage tank in the horizontal direction, preventing the ship's rolling from affecting the B-type storage tank and reducing the risk of leakage. The top support mechanism, the lateral support mechanism and the vertical support mechanism form an overall support layer, which is wrapped around the outside of the main screen wall of the B-type storage tank.

[0051] A secondary barrier 4 is arranged between the tank bottom, the main barrier and the hull structure. The secondary barrier has the same shape as the external contour structure of the tank bottom. It is inserted in the middle of the vertical support mechanism and fixed by the vertical support mechanism. Figure 2 As shown in , the secondary barrier is located at the bevel of the B-type tank, and a vertical support mechanism is also provided. The secondary barrier is fixed between the hull structure and the main barrier through the vertical support mechanism. The secondary barrier divides the main barrier and the hull structure into two areas. The inner surface of the secondary barrier and the outer surface of the main barrier form the first area, and the outer surface of the secondary barrier and the inner surface of the hull structure form the second area. The distance between the secondary barrier and the main barrier is 1000mm, and the distance between the secondary barrier and the hull structure is 700mm. The distance settings of 1000mm and 700mm can ensure that when construction personnel enter the first area and the second area, there is enough maintenance space to inspect the outer surface of the main barrier, the secondary barrier, and the inner surface of the hull structure. In the first area, a detection device is also installed and filled with inert gas. The detection device can detect leaking gas, find problems in time and solve them.

[0052] The inner surface of the secondary screen wall is paved with a first anti-buckling layer, which is a T-shaped material 9. A plurality of T-shaped materials are paved on the inner surface of the secondary screen wall at equal intervals to form a first anti-buckling layer in a grid shape, which effectively prevents the secondary screen wall from being deformed by cooling and eliminates the buckling stress of the secondary screen wall after cooling. The outer surface of the main screen wall is also covered with an insulating layer 8, which is disconnected at the top support mechanism, the lateral support mechanism, and the vertical support mechanism.

[0053] Example 2

[0054] A new type of B-type independent tank has a B-type tank 1 with a main screen wall 3. The B-type tank is arranged in a hull structure 2. A support layer is arranged between the hull structure and the main screen wall. The structure of the support layer is the same as that of the support layer in Example 1. The B-type tank is fixed in the hull structure through the support layer. At the bottom of the B-type tank, a secondary screen wall is also arranged between the main screen wall and the hull structure. The shape of the secondary screen wall is the same as the bottom and external contour of the B-type tank. The secondary screen wall is supported and fixed by a vertical support mechanism. The secondary screen wall divides the space between the main screen wall and the hull structure into two areas, namely the first area and the second area. The distance between the secondary screen wall and the main screen wall is 900mm, and the distance between the secondary screen wall and the hull structure is 600mm. The distance settings of 900mm and 600mm can ensure that when construction personnel enter the first area and the second area, there is enough maintenance space to inspect the outer surface of the main screen wall, the secondary screen wall, and the inner surface of the hull structure. The highest point of the secondary barrier wall is equal to the highest point of the beveled part of the B-type tank, that is, the highest point of the secondary barrier wall is located at the beveled part of the B-type tank.

[0055] like Fig.18 As shown, when the highest point of the secondary screen wall is equal to the highest point of the beveled part of the B-type tank, the top of the secondary screen wall is obliquely inserted into the clamping member of the transition mechanism and is bonded and fixed to the laminated wood in the clamping member. Along the top edge of the secondary screen wall, a circle of transition mechanisms are arranged at equal intervals, and the structure of the transition mechanism is the same as the structure of the transition mechanism in Example 1. Along the top edge of the secondary screen wall, a circle of transition mechanisms are arranged at equal intervals, and the width of the steel structure platform with the transition mechanism is 900mm. One end of the steel structure platform is welded to the hull structure, and the other end is welded with a steel clamping member. Laminated wood is bonded in the clamping member. The width of the laminated wood is 350mm. The top of the secondary screen wall is obliquely inserted into the laminated wood and is bonded and fixed to the laminated wood. Ensure the stability of the top of the secondary screen wall.

[0056] The B-type storage tank structure adopted by the present invention provides all-round protection for the B-type storage tank, eliminates dangerous factors that may cause leakage of liquefied gas, can perform real-time detection and monitoring of the B-type storage tank, and ensures the transportation safety of the B-type storage tank.

Claims

1. A new type of B-type independent storage tank, which is arranged in the hull structure and is characterized by: A support layer is provided between the main screen wall (3) of the B-type storage tank and the hull structure (2), the support layer comprising a top support mechanism (5), a lateral support mechanism (6) and a vertical support mechanism (7), and the B-type storage tank is fixed in the hull structure through the support layer; A secondary barrier (4) is also provided between the bottom of the B-type tank, the main barrier and the hull structure. The secondary barrier has the same shape and external contour structure as the bottom of the B-type tank, wraps the bottom of the B-type tank, and the highest point of the secondary barrier top is equal to or higher than the highest point of the B-type tank bevel. The top of the secondary barrier is fixedly connected to the hull structure through a transition mechanism. The secondary barrier is fixed between the main barrier and the hull structure through a vertical support mechanism, and the inner surface of the secondary barrier is covered with a first anti-bend layer. The transition mechanism has a special-shaped steel structure platform (54), one end of which is welded to the hull structure, and the other end is welded to a steel structure clamping member (52). The steel structure clamping member is a square groove with an opening on one side. The groove opens downward and is filled with laminated wood (51). The top of the secondary screen wall is inserted into the laminated wood and fixed.

2. A new type B-type independent storage tank as claimed in claim 1, characterized in that: A circle of transition mechanisms is arranged at equal intervals along the edge of the top of the secondary screen wall.

3. A new type of B-type independent storage tank as claimed in claim 1, characterized in that: The highest point of the secondary barrier top is 800-1000mm above the highest point of the B-type tank cut.

4. A new type B-type independent storage tank as claimed in claim 1, characterized in that: The first anti-bend layer is a T-shaped material (9), which is welded to the inner surface of the secondary screen wall to form the first anti-bend layer in a grid shape as a whole.

5. A new type B-type independent storage tank as claimed in claim 1, characterized in that: A row of top support mechanisms are arranged at the top of the main screen wall along the length direction of the B-type storage tank; a row of lateral support mechanisms are arranged on both sides of the main screen wall along the height direction of the B-type storage tank; and a plurality of rows of vertical support mechanisms are arranged at the bottom of the main screen wall along the length direction of the B-type storage tank.

6. A new type of B-type independent storage tank as claimed in claim 1, characterized in that: The distance between the secondary barrier and the primary barrier is 950-1050mm, and the distance between the secondary barrier and the hull structure is 650-750mm.

7. A new type of B-type independent storage tank as claimed in claim 1, characterized in that: The outer surface of the main screen wall is covered with an insulating layer (8).

Images