WO2022028366A1

WO2022028366A1 - Independent secondary screen wall-type b-type storage cabin

Info

Publication number: WO2022028366A1
Application number: PCT/CN2021/110065
Authority: WO
Inventors: 张义明; 常立勇; 关英华; 于世旭; 马俊; 张梅
Original assignee: 大连船舶重工集团有限公司
Priority date: 2020-08-03
Filing date: 2021-08-02
Publication date: 2022-02-10
Also published as: CN111924040A; JP3242783U; KR20230000442U

Abstract

An independent secondary screen wall-type B-type storage cabin (1) is provided in a ship structure. A supporting layer is provided between a main screen wall (3) of the B-type storage cabin (1) and the ship structure (2); the supporting layer comprises a top supporting mechanism (5), a lateral supporting mechanism (6), and a vertical supporting mechanism (7). A secondary screen wall (4) is further provided between the bottom of the B-type storage cabin (1), the main screen wall (3), and the ship structure (2), the shape of the secondary screen wall (4) is same as the external contour structure of the bottom of the B-type storage cabin (1), and the secondary screen wall (4) is supported and fixed by means of the vertical supporting mechanism (7). The independent secondary screen wall-type B-type storage cabin has the effects of being capable of dealing with liquid leakage of different scales and avoiding more damage and loss to the ship structure.

Description

An independent sub-wall type B-type storage tank

technical field

The invention relates to the technical field of ships and marine structures, in particular to a B-type storage tank with a more stable and safer independent sub-barrier structure.

Background technique

The International Maritime Organization (IMO) clearly defines Type B independent in its International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) and International Safety Code for Ships Using Gas or Other Low Flash Point Fuels (IGF Code). Functions and definitions of storage tanks (hereinafter referred to as "B-type tanks"). Type B tanks are mostly used in large ships and marine engineering structures, and their functions include but are not limited to transporting liquefied gas, serving as a liquefied gas fuel tank, etc. The liquefied gas it carries includes but is not limited to liquefied natural gas (LNG), liquid ammonia fuel (NH3), liquefied ethylene gas (LEG), etc.

According to IMO IGF/IGC regulations, B-type tanks need to be provided with partial secondary barriers with small leakage protection systems. The traditional B-type storage tank is only provided with support structures at the top and bottom. During the sailing process, the ship will roll or pitch. The shaking of the ship will affect the storage tank, causing the storage tank to also shake, increasing the failure of the B-type tank. Risk of breakage, resulting in leakage of liquefied gas.

As shown in Figures 1 and 2, traditional B-type storage tanks are mainly divided into two forms, namely, ① prismatic B-type storage tanks and ② spherical tank-type B-type storage tanks. Among them, the prismatic B-type storage tank can well suppress the sloshing effect of the internal liquefied gas, and is very flexible in shape design, which can achieve high matching of the capacity utilization rate and the ship type. However, there are many stress concentration points in the prismatic B-type storage tank, and the safety risk is a big challenge, and a detailed stress analysis is required. The spherical tank type B-type storage tank has a good pressure bearing effect, high structural safety, and low risk of damage. However, the utilization rate of the spherical tank capacity is very low, and the volume of liquefied gas that can be loaded is limited.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides an independent sub-barrier type B-type storage tank, which aims to achieve the structural stability of the B-type storage tank in the process of transporting liquefied gas, so that the sub-barrier can efficiently collect and process small Leaked cryogenic liquid can also contain large leaked cryogenic liquid under extreme working conditions to ensure safe transportation and prevent the leakage of liquefied gas; at the same time, the capacity utilization rate of the B-type storage tank is improved, and its function during operation is optimized. The technical solution adopted is:

A new type B-type independent storage tank, the B-type storage tank is arranged in the hull structure, and a support layer is arranged between the main barrier wall and the hull structure of the B-type storage tank, and the support layer includes a top support mechanism and a side support mechanism. And the vertical support mechanism, the B-type storage tank is fixed in the hull structure through the support layer.

The support layer arranged between the main barrier and the hull structure, as well as the frame and strong frame structure arranged on the inner surface of the main barrier, provide advance protection for the B-type storage tank and eliminate the risk factors that may cause leakage to the B-type storage tank .

Through the support layer, the B-type storage tank is supported and fixed in the hull structure, and the upper, lower, left and right sides of the storage tank are fixed in all directions, thereby ensuring the safety performance of the B-type storage tank during the navigation of the ship. When the ship rolls or pitches, the combination of the top support mechanism and the vertical support mechanism and the combination of the two rows of lateral support mechanisms give longitudinal and lateral constraints respectively, so that the B-type storage tank will not be affected by rolling or pitching. Shake is generated to ensure the stability of the B-type storage tank, thereby avoiding the leakage of liquefied gas in the B-type storage 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 storage tank are symmetrical. The top support mechanism cooperates with the vertical support mechanism to limit the shaking in the longitudinal direction of the B-type storage tank, and the lateral support mechanisms on both sides cooperate to limit the lateral shaking of the B-type storage tank, thereby ensuring the transportation of liquefied gas. Safety. The main screen wall can be made of stainless steel, 9% Ni steel, high manganese low temperature steel, aluminum alloy and other metal materials with low temperature performance.

Among them, the longitudinal direction of the B-type tank: the same as the longitudinal direction of the hull and marine engineering structures, that is, its length direction.

The transverse direction of the B-type tank: the same as the transverse direction of the hull and marine engineering structures, that is, its width direction.

The vertical direction of the B-type tank: the same as the vertical direction of the hull and marine engineering structures, that is, its height direction.

The support layer of the present invention not only plays the role of supporting the B-type storage tank, but also mainly protects the B-type storage tank in the early stage, fixes the B-type storage tank inside the hull structure, exerts all-round force on the B-type storage tank, clamps the Hold the B-type storage tank to prevent the B-type tank from being damaged during the navigation of the ship, thereby preventing the leakage of liquefied gas. The top support mechanism corresponds to the vertical support mechanism, and the lateral support mechanism on both sides corresponds to this structure. With this structure of symmetrical force application and point-to-point force clamping, it is possible to use less construction materials to achieve maximum The stable effect saves construction materials and reduces construction costs.

A secondary barrier is also arranged at the bottom of the B-type storage tank, between the main barrier and the hull structure. The shape of the secondary barrier is the same as the bottom of the B-type storage tank and its external contour structure, wrapping the bottom of the B-type storage tank, and the top of the secondary barrier. The highest point is equal to or higher than the highest point of the B-type storage tank inclination, the secondary screen is fixedly connected with the hull structure through the transition mechanism, the secondary screen is fixed between the main screen and the hull structure by the vertical support mechanism, and the top of the secondary screen is the highest The point is 800-1000mm above the highest point of the B-type storage tank slope. The secondary barrier is independently set between the main barrier and the hull structure, and its shape is the same as the outline structure outside the bottom of the ship, which protects the primary barrier and contains leaked liquefied gas. This structure meets the requirements of IMO IGF/ In addition to the relevant regulations of IGC, it is necessary to reduce the installation of leakage protection devices or devices for handling low-temperature liquids. The liquefied gas in the storage tank leaks, flows through the main screen wall, and flows into the secondary screen wall along the outer surface of the main screen wall. The secondary screen wall is like a bowl. Placed at the bottom of the B-type storage tank, ready to receive leaked liquefied gas.

The movement of the hull will cause shaking, and the lateral or longitudinal shaking of the ship will cause a certain inclination angle. The part of the secondary barrier that is higher than the slanted part can also completely wrap the bottom of the main barrier to protect the main barrier against liquefaction when the ship forms an inclination angle. Gas leaks.

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 with the hull structure, and the other end is welded with a steel clamping member. The steel clamping member is a square groove with an opening on one side, and the groove opening is downward. The interior is filled with laminated wood and the top of the secondary screen is inserted into the laminated wood and fixed. 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 an inspection platform. A ladder is set up on the transition mechanism, and the operator can enter the space between the secondary screen wall, 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, and a size width of 800-1000mm is used to facilitate the erection of ladders on the steel structure platform.

The secondary barrier is a plate with upwardly raised flat baffles or curved baffles on the edge of the plate, the length of the plate is not less than the length of the lowest plane of the B-type storage tank, less than the maximum length of the B-type storage tank, the width of the plate Not less than the width of the lowest plane of the B-type storage tank, and less than the maximum width of the cabin space below the B-type storage tank; the side of the secondary barrier close to the main barrier, one or more collection tanks are fixed on the board surface, the opening of the collection tank is upward, and the bottom of the tank is upward. It is fixed on the secondary screen wall, and a drainage device for guiding the leakage liquid to flow into the collection tank is provided on the outer surface of the main screen wall, the position or area with high risk of liquid leakage in the B-type storage tank. The drainage device can be a strip-shaped groove or a pipe, and the drainage device can be any device that can guide the flow of leaked liquid, such as in a collection tank. The material of the collection tank is the same as that of the secondary screen wall, and the collection tank and the secondary screen wall are fixedly connected by a combination of materials. The collection tank can be arranged at any position on the secondary screen wall, and the setting position of the collection tank is flexible, which can avoid the vertical support mechanism or other important components at the bottom of the B-type storage tank. corner. The secondary screen wall adopts this kind of structure combining the plate type with the collection tank and the diversion device, which saves space and has stronger flexibility while ensuring that it can cope with large and small liquid leakage.

The secondary barrier divides the area between the primary barrier and the hull structure into two, the outer surface of the primary barrier and the inner surface of the secondary barrier form a first area, and the outer surface of the secondary barrier and the inner surface of the hull structure form a second area. The operator can enter the first area or the second area, and perform maintenance on the equipment in the first area or the second area. Wherein, a detection device for leaking gas can be arranged 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 that of the main screen wall, and its thickness is preferably but not limited to 10mm-15mm. The main function of the secondary barrier is to serve as a receiving tank for small leakage liquids, to protect the hull structure from low temperature liquids, and only transmit mechanical loads in the force mechanism, so it can be set in the form of a thin plate, thereby optimizing the weight of the structure and saving costs.

The inner surface of the secondary screen wall is covered with a first anti-buckling layer, the first anti-buckling layer is a T profile, the T profile is welded on the inner surface of the secondary screen wall, and the horizontal and vertical lines of the T profile intersect to form an overall grid This grid-type structure makes the inner surface of the secondary screen wall evenly stressed, so that the secondary screen wall can be controlled as a whole to prevent it from being deformed by cold shrinkage. In order to ensure that in the case of liquid leakage, the liquefied gas can be better contained. Even if the B-type storage tank leaks, the safety of the B-type storage tank can be guaranteed, and the B-type storage tank is provided with a protective measure to allow maintenance The personnel shall repair the main screen wall as soon as possible, stop the leakage, reduce the risk factor and reduce the loss.

There is a row of top support mechanisms at the top of the main screen along the length of the B-type storage tank; on both sides of the main screen, along the height direction of the B-type storage tank, a row of lateral support mechanisms; at the bottom of the main screen, along the B-type storage tank In the length direction of the cabin, there are multiple rows of vertical support mechanisms. The overall support layer formed by the top support mechanism, vertical support mechanism and 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 and pitching of the ship. or other external impact effects, protect the B-type storage tank to avoid the leakage of liquefied gas. A row of top support mechanisms is arranged on the top of the main screen wall, a plurality of top support mechanisms are arranged on the top of the main screen wall, and the plurality of top support mechanisms are arranged at equal intervals along the length direction of the B-type storage tank. On both sides of the main screen wall, along the height direction of the B-type storage tank, a row of lateral support mechanisms are respectively arranged, 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 along the length 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 of the main screen wall, the sides of the main screen wall and the bottom of the main screen wall in a modular form to form an integral support layer.

The distance between the secondary screen wall and the main screen wall is 950-1050mm, and the distance between the secondary screen wall 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 up to facilitate the inspection personnel to enter the hull structure, and to facilitate the inspection of the outer surface of the main barrier and the secondary barrier of the B-type storage tank. Detect the inner surface of the main screen, and monitor the outer surface of the main screen in real time. If there is any abnormality, repair it in time. Before the liquefied gas leaks, the problem can be solved to avoid the leakage of liquefied gas.

In the above-mentioned independent sub-wall type B-type 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 with a certain thickness is formed on the outside of the B-type storage tank, which has the effect of thermal insulation.

The structural arrangement 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 storage tank and the hull structure into two parts, so that there is sufficient space between the B-type storage tank and the hull structure. The main screen wall, secondary screen wall and hull structure can be overhauled at any time, and problems can be found and solved in time.

The structure of the present invention eliminates the risk factors of leakage of the B-type storage tank, and even if the B-type storage tank leaks due to unavoidable reasons, the technical solution of the present invention can solve the leakage of liquefied gas in time and avoid the leakage of liquefied gas The effect of causing more damage and loss to the hull structure. Also, the present invention can cope with liquid leakage of different scales.

The beneficial effects of the present invention are:

As an independent structure, the secondary screen wall is located between the main screen wall and the hull structure, and has an inspection space that meets the requirements during operation and maintenance, which is convenient for personnel to check and maintain the operating status of the main screen wall, secondary screen wall and supporting structure, which is beneficial to Structural safety and maintainability.

By separating the secondary barrier from the main barrier or the surface of the hull structure, the local stress at the connection between the secondary barrier and the surrounding structure is released, and the influence of the hull motion or mechanical vibration on the safety of the secondary barrier is greatly reduced.

The secondary screen itself serves as the receiving tray for the leaking liquid, which covers a large area and can flexibly handle the low-temperature liquid that drips down. It flows into the collection tank, the collection tank collects the leaked liquid, and the trickle itself will also evaporate into gas in the inner space enclosed by the main screen wall and the secondary screen wall and can be blown out by the inert gas purging system; Large, the secondary screen wall itself can store the leaked liquid for a certain period of time, so as to gain time for subsequent maintenance and emergency treatment. In addition, the traditional form of secondary barrier lacks sufficient maintenance space, and additional leakage liquid collection and treatment systems are required, which also significantly increases the cost of construction and maintenance.

Description of drawings

Figure 1 is a schematic diagram of the structure of a traditional prismatic B-type cabin with a splash-proof film;

Figure 2 is a schematic structural diagram of a traditional spherical tank type B-type storage tank;

3 is a schematic diagram of the front structure of the storage tank and the hull structure of the present invention;

Fig. 4 is A-A sectional structure schematic diagram in Fig. 3;

Fig. 5 is the front view structure schematic diagram of transition mechanism;

Fig. 6 is the top view structure schematic diagram of transition mechanism;

Fig. 7 is a form in which the two side walls of the secondary barrier are perpendicular to the bottom, and the highest point of the secondary barrier in this form is higher than the highest point of the B-type storage tank inclination, and is a schematic diagram of the front view of the structure connected to the hull structure through a transition mechanism;

Figure 8 is a form in which the two side walls of the secondary barrier are perpendicular to the bottom. The highest point of the secondary barrier in this form is higher than the highest point of the B-type storage tank inclination, and is a schematic side view of the structure connected to the hull structure through a transition mechanism;

Figure 9 is the form of the obtuse angle between the two side walls and the bottom of the secondary barrier, the highest point of the secondary barrier in this form is higher than the highest point of the B-type storage tank inclination, and the main view of the structure connected to the hull structure through the transition mechanism ;

Figure 10 is a form of the obtuse angle between the two side walls and the bottom of the secondary barrier, the highest point of the secondary barrier in this form is higher than the highest point of the B-type storage tank inclination, and is a schematic side view of the structure connected to the hull structure through a transition mechanism ;

Fig. 11 is the top-view structure schematic diagram of Fig. 8, Fig. 9, Fig. 10;

Figure 12 is a schematic view of the front view of the form in which the two side walls of the secondary barrier are perpendicular to the bottom, and the highest point of the secondary barrier in this form is equal to the highest point of the B-type storage tank inclination, and is connected to the hull structure through a transition mechanism;

Figure 13 is a side view of the form in which the two side walls of the secondary barrier are perpendicular to the bottom, and the highest point of the secondary barrier in this form is equal to the highest point of the B-type storage tank inclination, and is connected to the hull structure through a transition mechanism.

Figure 14 is a form of obtuse angle between the two side walls and the bottom of the secondary barrier, and the highest point of the secondary barrier in this form is equal to the highest point of the B-type storage tank inclination, and is a schematic view of the front view of the structure connected to the hull structure through a transition mechanism;

Figure 15 is a schematic side view of the structure in which the angle between the two side walls and the bottom of the secondary barrier is an obtuse angle, the highest point of the secondary barrier in this form is equal to the highest point of the B-type storage tank inclination, and is connected to the hull structure through a transition mechanism;

Fig. 16 is a schematic top view of Fig. 13, Fig. 14, Fig. 15, Fig. 16;

Figure 17 is a schematic diagram of the connection structure between the top of the secondary barrier and the transition mechanism;

Figure 18 is a schematic diagram of the front structure of the B-type storage tank with a sloping structure at the bottom, and the secondary barrier is a plate;

Fig. 19 is the side view structure schematic diagram of Fig. 18;

Figure 20 is a schematic diagram of the front structure of the B-type storage tank bottom edge using a circular arc structure, the secondary screen wall is a plate;

Fig. 21 is the side view structure schematic diagram of Fig. 20;

Among them: 2-hull structure, 3-main barrier, 4-secondary barrier, 5-top support mechanism, 6-lateral support mechanism, 7-vertical support mechanism, 8-insulation layer, 9-T profile, 10- Splash-proof film, 11-collection tank, 12-strong frame, 51-laminated wood, 52-clamping member, 53-bracket, 54-steel structure platform.

detailed description

The present invention will be further described with reference to the accompanying drawings.

Example 1

As shown in Figures 3 and 4, an independent sub-barrier type B-type storage tank has a B-type storage tank 1 with a main screen wall 3, the main screen wall is made of stainless steel metal material, and the B-type storage tank is arranged in the hull structure. 2, a support layer is arranged between the hull structure and the main screen wall, and the B-type storage tank is fixed in the hull structure through the support layer. At the bottom of the B-type storage tank, there is also a secondary screen wall 4 between the main screen and the hull structure. 13, 14, 15), the highest point of the top of the secondary barrier is located 900mm above the highest point of the B-type storage tank inclination, 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 screen wall, a circle of transition mechanisms are arranged at equal intervals (as shown in Figures 11 and 16). As shown in Figures 5 and 6, the transition mechanism is provided with a special-shaped steel structure platform 54. 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 the construction personnel can enter the hull structure and the main screen along the ladder. in the area between the walls. One end of the steel structure platform is welded with 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 interior is filled with laminated wood 51. The laminated wood and the groove of the clamping member are fixed by adhesive bonding, the top of the secondary screen wall is inserted into the laminated wood, and the laminated wood is fixed by adhesive bonding. Brackets 53 are welded at the connection between the steel structure platform and the hull structure to enhance the structural stability. There is a bevel transition between the clamping member and the steel structure platform, which can realize the change of width. The flexible connection of laminated wood and steel structure is adopted to prevent the load of the hull structure from being transferred to the secondary barrier, which can not only enhance the stability of the sidewall of the secondary barrier, but also avoid the direct action of large hull loads on the secondary barrier on the sheet.

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 on the top of the main screen wall, and a row of top supports is arranged along the lengthwise centerline of the B-type storage tank. Mechanism, the top support mechanism is a rectangle as a whole, which spans on the strong frame 12 of the B-type storage tank, and is perpendicular to the center line of the B-type storage tank in the length direction. Increase the strength support and holding area of the top support mechanism on the top of the B-type storage tank, enhance the holding strength of the B-type storage tank top, and control the B-type storage tank more effectively.

Multiple rows of vertical support mechanisms are arranged at the bottom of the main screen wall and on both sides of the center line along the length of the B-type storage tank, and the vertical support mechanisms are 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 strength at the top of the B-type storage tank corresponds to the holding strength at the bottom, and the corresponding strength applied from the upper and lower sides 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.

On both sides of the main screen wall, along the height direction centerline of the main screen wall, each is provided with a row of lateral support mechanisms. The side support mechanisms are rectangular as a whole and span the vertical strong frame structure 12 and are perpendicular to the height direction centerline. A row of lateral support mechanisms are arranged on the centerline of the height direction on both sides of the B-type storage tank, and the lateral support mechanism sits laterally on the longitudinal strong frame structure. It can effectively fix the B-type storage tank in the lateral direction, prevent the ship's rolling from affecting the B-type storage tank, and reduce the risk of leakage. The top support mechanism, the lateral support mechanism and the vertical support mechanism form an integral support layer, which is wrapped outside the main baffle of the B-type storage tank.

A secondary barrier 4 is arranged between the bottom of the storage tank, the main barrier and the hull structure. The shape of the secondary barrier is the same as the outer contour structure of the bottom of the storage tank. It is inserted in the middle of the vertical support mechanism and fixed by the vertical support mechanism. As shown in Figure 3, the secondary screen is located at the inclined position of the B-type storage tank, and a vertical support mechanism is also provided, through which the secondary screen is fixed between the hull structure and the main screen. The secondary barrier divides the primary barrier and the hull structure into two areas, the inner surface of the secondary barrier and the outer surface of the primary barrier form a first area, and the outer surface of the secondary barrier and the inner surface of the hull structure form a second area. The distance between the secondary screen wall and the main screen wall is 1000mm, the distance between the secondary screen wall and the hull structure is 700mm. Overhaul space, overhaul the outer surface of the main screen wall, the secondary screen wall, 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 the leaking gas, find and solve the problem in time.

A first anti-buckling layer is laid on the inner surface of the secondary screen wall, and the first anti-buckling layer is a T profile 9. A plurality of T profiles are laid on the inner surface of the secondary screen wall at equal intervals to form a grid-shaped first anti-buckling layer as a whole. , effectively avoid the secondary screen wall being deformed by cold, and eliminate the buckling stress after the secondary screen wall is cooled. The outer surface of the main screen is also covered with a layer of insulating layer 8, and the insulating layer is disconnected at the top support mechanism, the lateral support mechanism and the vertical support mechanism.

Example 2

An independent sub-barrier type B-type storage tank has a B-type storage tank 1 with a main screen wall 3, the B-type storage tank is arranged in the hull structure 2, and a support layer is arranged between the hull structure and the main screen wall to support The structure of the layer is the same as that of the support layer in Example 1, and the B-type storage tank is fixed in the hull structure through the support layer. At the bottom of the B-type storage tank, there is also a secondary barrier between the main barrier and the hull structure. The shape of the secondary barrier is the same as the bottom and external contour of the B-type storage tank. The secondary barrier is supported and fixed by a vertical support mechanism. The 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 distances of 900mm and 600mm can ensure that the construction personnel have enough space when entering the first and second areas. Overhaul space, overhaul the outer surface of the main screen wall, the secondary screen wall, and the inner surface of the hull structure. Secondly, the highest point of the barrier is equal to the highest point at the slope of the B-type storage tank, that is, the highest point of the secondary barrier is located at the slope of the B-type storage tank.

As shown in Figure 17, when the highest point of the secondary barrier is equal to the highest point at the slope of the B-type storage tank, the top of the secondary barrier is inserted obliquely into the clamping member of the transition mechanism, and the laminated wood in the clamping member Adhesive fixation. 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 that of the transition mechanism in Embodiment 1. Along the top edge of the secondary screen wall, a circle of transition mechanisms are arranged at equal intervals. The width of the steel structure platform carried by the transition mechanism is 900mm. One end of the steel structure platform is welded with the hull structure, and the other end is welded with a steel clamping member. Laminated wood is glued, the width of the laminated wood is 350mm, the top of the secondary screen is inserted into the laminated wood obliquely, and the laminated wood is bonded and fixed. Ensure the stability of the top of the secondary screen wall.

Example 3

As shown in Figures 18 and 19, the bottom edge of the main screen wall 3 is a beveled structure, and the bevel angle is preferably but not limited to 45°. The lateral direction of the main screen wall is The bottom edge is a right-angle structure, and all edges and transitions between surfaces are rounded transitions, and the radius is preferably but not limited to 100mm-1000mm to reduce the local stress concentration of the structure and improve the pressure bearing efficiency of the structure. An insulating layer 8 is laid on the outer surface of the main screen.

The secondary screen wall 4 is located between the main screen wall 3 and the hull structure 2. The secondary screen wall is connected with the main screen wall and the hull structure by a vertical mechanism, and is interspersed in the middle of the vertical support mechanism. The secondary barrier is a plate with a thickness of 15mm, the length of the plate is not less than the length of the lowest plane of the type B storage tank, less than the maximum length of the type B storage tank, the width of the plate is not less than the width of the lowest plane of the type B storage tank, less than the width of the lowest plane of the type B storage tank The maximum width of the storage tank. At the four corners of the side of the secondary screen wall close to the main screen wall, collection tanks 11 for receiving the leaked liquid are arranged. The edge of the board has a flat baffle that is raised upward, and the transition with the bottom of the secondary screen wall adopts a rounded corner. The radius of the rounded corner is preferably but not limited to 50mm-500mm. The baffle is combined with the board to form a tray, which has a better effect on the receiving of liquids. good. There is a 600mm-700mm maintenance space between the highest point of the secondary screen wall and the outer surface of the insulating layer, and a 600mm-700mm maintenance space between the bottom surface of the secondary screen wall and the hull structure.

Through the calculation of fatigue and crack propagation, determine the location or area with high risk of liquid leakage. On the outer surface of the main barrier of the B-type storage tank, a diversion device is provided. The diversion device is a diversion groove (not shown in the figure), and the diversion groove one end extends into the collection tank. In the event of a small liquid leak, the diversion tank can drain the leaked liquid into the collection tank, and the collection tank collects the leaked liquid and waits for subsequent manual processing.

Example 4

An independent secondary screen wall type B-type storage tank, as shown in Figures 20 and 21, the present invention will be further described with reference to the accompanying drawings, the bottom edge of the main screen wall 3 in the lateral direction is a circular arc structure, and its radius is preferably but not limited to 500mm -10000mm, the bottom edge in the lateral direction is a circular arc structure, and its radius is preferably but not limited to 500mm-10000mm. An insulating layer 8 is laid on the outer surface of the main screen.

The secondary screen wall 4 is located between the main screen wall 3 and the hull structure 2. The secondary screen wall is connected with the main screen wall and the hull structure by a vertical mechanism, and is interspersed in the middle of the vertical support mechanism. The secondary barrier is a plate, the length of the plate is not less than the length of the lowest plane of the type B storage tank, less than the maximum length of the type B storage tank, the width of the plate is not less than the width of the lowest plane of the type B storage tank, less than the maximum width of the type B storage tank . On the side of the secondary screen wall which is close to the main screen wall and does not interfere with the position or area of the vertical support mechanism, a collection tank 11 for receiving the leaked liquid is provided. The edge of the plate has an upwardly curved baffle, and the radius of the rounded corner of the arc baffle is preferably but not limited to 50mm-1000mm. The baffle is combined with the plate to form a tray, which has a better effect on receiving liquids. There is a 600mm-700mm maintenance space between the highest point of the secondary screen wall and the outer surface of the insulating layer, and a 600mm-700mm maintenance space between the bottom surface of the secondary screen wall and the hull structure.

The B-type storage tank structure adopted in the present invention provides all-round protection for the B-type storage tank, eliminates the dangerous factors that may cause the leakage of liquefied gas, can conduct real-time detection and monitoring of the B-type storage tank, and ensures that the B-type storage tank is in the Safety of ships while sailing.

Claims

An independent sub-barrier type B-type storage tank, the B-type storage tank is arranged in the hull structure, and it is characterized in that: a support layer is provided between the main screen wall (3) and the hull structure (2) of the B-type storage tank , the support layer includes 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 arranged at the bottom of the B-type storage tank, between the main barrier and the hull structure. The shape of the secondary barrier is the same as that of the B-type storage tank bottom and external contour structure, wrapping the B-type storage tank bottom. The highest point of the top of the barrier is equal to or higher than the highest point of the B-type storage tank inclination, and 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 by a vertical support mechanism, and the secondary barrier is The inner surface of the screen wall is covered with a first anti-buckling layer.
An independent secondary barrier type B-type storage tank as claimed in claim 1, characterized in that: the secondary barrier is a board, and the edge of the board is provided with a plane baffle or an arc baffle that is raised upward, and the The length is not less than the length of the lowest plane of the type B storage tank, less than the maximum length of the type B storage tank, and the width of the plate is not less than the width of the lowest plane of the type B storage tank, and less than the maximum width of the cabin space below the type B storage tank; outside the main barrier Drainage devices are installed on the surface and in the high-risk locations or areas of the B-type storage tank. The secondary screen wall is close to the main screen wall. One or more collection grooves (11) are fixed on the board surface. The opening of the collection groove is upward, and the bottom is fixed at On the secondary screen wall, the drainage device will drain the leaked liquid into the collection tank.
An independent secondary barrier type B-type storage tank according to claim 1, characterized in that: along the edge of the top of the secondary barrier, a circle of transition mechanisms are arranged at equal intervals.
An independent secondary barrier type B-type storage tank according to claim 3, characterized in that: the transition mechanism has a special-shaped steel structure platform (54), one end of the steel structure platform is welded with the hull structure, and the other end is clamped with the steel structure The holding member (52) is welded and connected, the steel structure holding member is a square groove with an opening on one side, the groove is opened downward, the interior is filled with laminated wood (51), and the top of the secondary screen wall is inserted into the laminated wood to be fixed.
An independent sub-barrier type B-type storage tank as claimed in claim 1, characterized in that: the highest point of the top of the sub-screen wall is located 800-1000mm above the highest point of the slope of the B-type storage tank.
An independent secondary barrier type B-type storage tank according to claim 1, characterized in that: the first anti-buckling layer is a T profile (9), and the T profile is welded on the inner surface of the secondary barrier to form a grid as a whole. Type of first anti-buckling layer.
An independent secondary-barrier-type B-type storage tank as claimed in claim 1, characterized in that: a row of top support mechanisms is arranged on the top of the main barrier along the length of the B-type storage tank; on both sides of the main barrier, along the B-type storage tank In the height direction of the B-type storage tank, there is a row of lateral support mechanisms; at the bottom of the main screen wall, along the length direction of the B-type storage tank, there are multiple rows of vertical support mechanisms.
A kind of independent secondary barrier type B-type storage tank as claimed in claim 1 is characterized in that: 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.
An independent secondary barrier type B-type storage tank according to claim 1, characterized in that: an insulating layer (8) is adhered to the outer surface of the main barrier.