CN221024046U

CN221024046U - Submarine tank suitable for bubble drag reduction system

Info

Publication number: CN221024046U
Application number: CN202322967908.7U
Authority: CN
Inventors: 于雷; 唐传安; 徐恩广; 姜福茂; 张宝民; 张志彬; 孙屹; 路通; 孟中原; 李中华; 刘钢; 张磊; 王震; 于德超; 孙鹏; 吴炜; 孟繁烨; 戴振涛
Original assignee: Dalian Shipbuilding Industry Co Ltd
Current assignee: Dalian Shipbuilding Industry Co Ltd
Priority date: 2023-11-03
Filing date: 2023-11-03
Publication date: 2024-05-28
Anticipated expiration: 2033-11-03

Abstract

The sea chest suitable for the bubble drag reduction system comprises a sea chest, wherein the volume of the sea chest is firstly enlarged, two hull structures are vertically arranged in the enlarged sea chest, and spaces are reserved between the two hull structures and between the hull structures and a sea water main pipe. The two hull structures are respectively provided with an opening, the hull structure far away from the sea water main pipe is a first hull structure, the opening on the first hull structure is a first opening, and the first opening is arranged at the top of the first hull structure; the hull structure near the sea water main pipe is positioned on a second hull structure, the opening on the second hull structure is a second opening, and the second opening is formed at the bottom of the second hull structure. The invention adopts the special design form of the submarine tank, and effectively avoids bubbles from entering a seawater system. Aiming at the risk that bubbles of the bubble drag reduction system enter the submarine tank, a new submarine tank design scheme is provided, and the risk that the bubbles generated by the bubble drag reduction system enter the sea water main pipe is avoided by optimizing the structure and arrangement inside the submarine tank.

Description

Submarine tank suitable for bubble drag reduction system

Technical Field

The invention belongs to the field of ship construction and design, and particularly relates to a submarine tank suitable for a bubble drag reduction system.

Background

The bubble drag reduction system is a new energy-saving technology which is popular recently, the basic principle is that compressed air is blown to sea water by an air compressor, a large amount of bubbles are generated in the sea water, the bubbles can be attached to a ship bottom structure, the ship navigation resistance is reduced, the navigation speed is improved, the load of a host machine is reduced, and finally the purpose of reducing the ship navigation cost is achieved. In the C16K series project, a bubble drag reduction system is adopted, but a large amount of bubbles are generated at the bottom of the ship, and the large amount of bubbles move linearly toward the stern along with the ship's hull as the ship sails.

In the stern area of the ship, a high-level submarine tank and a low-level submarine tank are required to be arranged, and the main functions of the high-level submarine tank and the low-level submarine tank are to provide a sea door for a sea water system, ensure that a sufficient amount of sea water can enter a sea water main at the bottom of a cabin, and further provide sea water for a corresponding ship system through a main sea water pump, a water generator sea water pump, a washing system sea water pump, a iCER system sea water pump and the like which are connected to the sea water main at the cabin. If a large amount of bubbles are sucked into the seawater main pipe, the seawater pump can suck air, the stability of the outlet pressure cannot be guaranteed, the seawater pump and related equipment of a system can be damaged in severe cases, meanwhile, stable pressure cannot be provided, seawater cooling is required, and fresh water cooling equipment cannot be operated stably.

Therefore, for the ship project adopting the bubble drag reduction system, the possibility that bubbles enter the submarine tank needs to be considered in the submarine tank design, the submarine tank design needs to be optimized, and the bubbles in the seawater cannot enter the seawater main pipe to influence the whole seawater system.

Disclosure of Invention

In order to solve the problems, the invention provides a submarine tank suitable for a bubble drag reduction system, which aims to achieve the purpose of ensuring that bubbles in seawater cannot enter a seawater main pipe to influence the whole seawater system, and adopts the following technical scheme:

The sea chest suitable for the bubble drag reduction system comprises a sea chest, wherein the volume of the sea chest is firstly enlarged, two hull structures are vertically arranged in the enlarged sea chest, and spaces are reserved between the two hull structures and between the hull structures and a sea water main pipe.

The two hull structures are respectively provided with an opening, the hull structure far away from the sea water main pipe is a first hull structure, the opening on the first hull structure is a first opening, and the first opening is arranged at the top of the first hull structure; the hull structure near the sea water main pipe is positioned on a second hull structure, the opening on the second hull structure is a second opening, and the second opening is formed at the bottom of the second hull structure.

The submarine tank suitable for the bubble drag reduction system is a high-level submarine tank or a low-level submarine tank.

The submarine tank suitable for the bubble drag reduction system is further provided with the vent pipe in the submarine tank, and an outlet of the vent pipe is positioned on the submarine grid.

According to the submarine tank suitable for the bubble drag reduction system, the volume of the submarine tank is further expanded to be capable of being increased by more than 2 structures in the submarine tank, namely, according to the ship body structure, the distance 2520mm between 2 structural rib positions of the high-position submarine tank needs to be expanded to the midship, and the height direction of the low-position submarine tank needs to be expanded by 2065mm.

The submarine tank suitable for the bubble drag reduction system has the advantages that the flow area of the first opening and the second opening is larger than that of the seawater main pipe.

The submarine tank suitable for the bubble drag reduction system is characterized in that a plurality of ventilation ports are formed in the top of the submarine tank.

The submarine tank suitable for the bubble drag reduction system is characterized in that a plurality of zinc blocks of sacrificial anodes are arranged in the submarine tank.

The submarine tank suitable for the bubble drag reduction system expands the volume of the high submarine tank more recently, namely expands the submarine tank structure of the original midship and then expands the submarine tank structure of the original midship; the volume of the low-level submarine tank is enlarged by upwardly enlarging the original top submarine tank structure.

The submarine tank suitable for the bubble drag reduction system is further provided with 6 ventilation ports at the top.

The submarine tank suitable for the bubble drag reduction system is characterized in that 12 zinc blocks of sacrificial anodes are arranged in the submarine tank.

The design of the sea chest in the conventional project is shown in fig. 1 and 2, namely a high-level sea chest and a low-level sea chest, and the form belongs to the design scheme frequently adopted in the conventional project at present, and as can be seen from the figure, seawater can directly reach a sea water main after entering the sea chest through a sea water pump, and if the bubble drag reduction system is in an operating state, a large number of bubbles can be contained in the seawater at the moment, and the seawater also directly enters the sea water main along with the seawater and then enters the relevant sea water pump. Affecting the operation of the seawater pump and the entire seawater system (as shown in figure 3).

At present, the bubble drag reduction system is applied to a plurality of shipyards and a plurality of ship types, but only the special submarine tank design form is adopted by the invention so far, so that bubbles are effectively prevented from entering a seawater system. Aiming at the risk of bubbles entering the submarine tank of the bubble drag reduction system, the invention provides a new submarine tank design scheme, and the risk of bubbles generated by the bubble drag reduction system entering the sea water main pipe is avoided by optimizing the structure and arrangement inside the submarine tank.

Drawings

FIG. 1 is a schematic view of a conventional high-level sea chest;

FIG. 2 is a schematic view of the structure of a conventional low-level sea chest;

FIG. 3 is a schematic view of a seawater manifold and its associated seawater pump;

FIG. 4 is a schematic view of the structure of the high-level submarine tank;

FIG. 5 is a schematic top view of the structure of FIG. 4;

FIG. 6 is a schematic view of the structure of the low-level submarine tank;

FIG. 7 is a schematic top view of the structure of FIG. 6;

Wherein, 1-first hull structure, 2-second hull structure, 3-first trompil, 4-second trompil, 5-sea water house steward, 6-ventilative mouth, 7-ventilative pipe, 8-submarine grille, 9-sacrificial anode's zinc piece.

Detailed Description

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

Example 1

As shown in fig. 4 and 5, for the high-level submarine tank, the volume of the high-level submarine tank needs to be enlarged first, the submarine tank structure on the midship is enlarged to the midship, and the total volume of the high-level submarine tank is increased. In the enlarged submarine tank, 2 boat structures, namely a first boat structure 1 and a second boat structure 2, are added for controlling bubbles and seawater flow channels entering the high submarine tank. The hull structure far away from the sea water main pipe is a first hull structure 1, a first opening is formed in the first hull structure, the hull structure close to the sea water main pipe is positioned in a second hull structure 2, a second opening is formed in the second hull structure, the size of the opening can be determined according to the structural size of a specific project, and the opening is ensured to be larger than the flow area of the sea water main pipe. In this embodiment, the opening size of the first opening 3 and the second opening 4 is Φ714mm. The first ship body structure is provided with 4 first openings side by side, the flow area sum of the 4 openings is 1.06m2, the flow area of the seawater main pipe 5 of DN1000 is 0.77m2, and the flow areas of the first opening and the second opening are larger than the flow area of the seawater main pipe 5 of DN 1000. In order to control the flow path of air bubbles and seawater, the structure opening at the first hull structure 1 is opened at a position closer to the top, as shown in fig. 4, with the center of the first structure opening being 657mm from the top. The structure of the second hull structure 2 is perforated and opened at the bottom, the center of the second perforation is 1850mm away from the top of the cabinet, in this way, the seawater entering the high-level submarine tank is guaranteed to pass through a complex runner (the seawater runner is shown by arrows in fig. 4 and 5), the seawater passes through the submarine grille 8 and enters the high-level submarine tank, and after passing through the first perforation 3 and the second perforation 4, the seawater flows into the seawater header pipe 5, and bubbles are discharged from the seawater in the process of passing the seawater through the complex runner and reach the top of the high-level submarine tank due to the characteristic that the density of the bubbles is far lower than that of the seawater. Therefore, more ventilation openings 6 are added at the top of the high-level submarine tank, and 6 ventilation openings with the diameter DN100 are added at the top of the high-level submarine tank, so that bubbles separated from seawater are ensured, and the high-level submarine tank can be smoothly discharged through the ventilation openings. Considering that the high-order submarine tank structure is enlarged, the ventilation pipe 7 needs to be rearranged, so that the submarine grille 8 can be blown. Meanwhile, as the volume of the high-level submarine tank is increased, the number of zinc blocks 9 of the sacrificial anode is also required to be increased according to the increase of the protected area in the tank, and the total number is 12.

Example 2

As shown in fig. 6 and 7, in the case of the low-level submarine tank, similarly to the high-level submarine tank, it is necessary to enlarge the volume of the low-level submarine tank, and the original top submarine tank structure is enlarged upward to increase the total volume of the low-level submarine tank. In the enlarged submarine tank, 2 boat structures, namely a first boat structure 1 and a second boat structure 2, are added for controlling bubbles and seawater flow channels entering the high submarine tank. The hull structure far away from the sea water main pipe is a first hull structure 1, a first opening is formed in the first hull structure, the hull structure close to the sea water main pipe is positioned in a second hull structure 2, a second opening is formed in the second hull structure, the size of the opening can be determined according to the structural size of a specific project, and the opening is ensured to be larger than the flow area of the sea water main pipe. In this embodiment, the first and second openings have a size of 1720mmx1000mm and a chamfer of 300mm. Each hull structure has 1 number of openings. The flow area of the openings of the structure is far greater than the flow area of the seawater manifold 5 of DN1000 by 0.77m2. In order to control the flow paths of air bubbles and seawater, the first opening is opened at a position closer to the top of the first hull structure, and is 400mm away from the top of the cabinet. The second opening is arranged at the bottom of the second hull structure and is 1598mm away from the top of the cabinet, in this way, the seawater entering the low-level submarine tank passes through a complex runner (the seawater runner is shown by an arrow in fig. 5), passes through the submarine grille 8, enters the low-level submarine tank, passes through the first opening 3 and the second opening 4, flows into the seawater main pipe 5, and bubbles reach the top of the low-level submarine tank as the bubbles do in the high-level submarine tank. The top of the low-level submarine tank also needs to be added with more ventilation openings 6, as shown in fig. 7, 5 ventilation openings with the diameter DN100 are added at the top of the high-level submarine tank, so that bubbles separated from seawater are ensured, and the high-level submarine tank can be smoothly discharged through the ventilation openings. The ventilation pipe 7 needs to be rearranged to ensure that it can blow onto the seabed grid 8.

The basic ideas of the invention are 2:

1. The volume of the submarine tank is enlarged, and the path from the submarine gate to the seawater main pipe is prolonged by adding the structure and the holes.

2. Optimizing the sea water path in the submarine tank and increasing the design of high-low water reflection.

Finally, in these 2 ways, the bubbles in the seawater are discharged.

The invention can ensure that bubbles can not enter the sea water main pipe only by optimizing the design of the submarine tank, and the design scheme is needed for ships adopting the bubble drag reduction system, and can be considered to be adopted for projects that bubbles can enter the sea water system when certain draft is shallow and the sea condition is bad.

The main effect of this patent lies in can solving the problem that bubble drag reduction system produced bubble gets into the submarine tank, to the project that does not adopt this kind of design scheme at present, the phenomenon that the bubble got into sea water main pipe system has appeared, leads to the unable normal operating of sea water system. Therefore, for all ships adopting the bubble drag reduction system, the problem of bubbles entering the seawater system is solved by optimizing the submarine tank structure without a better solution at present, and the ship is the best solution at the design stage at present and is the only solution. And for newly-built ship projects, the design stage optimizes the submarine box structure, solves the problem of bubbles, occupies only part of bottom space, has lower design cost and construction cost, is flexible and simple in design form, has wide applicability, is easy to realize, and has strong feasibility.

Claims

1. The submarine tank suitable for the bubble drag reduction system is characterized in that the volume of the submarine tank is enlarged firstly, two hull structures are vertically arranged in the enlarged submarine tank, and spaces exist between the two hull structures and between the hull structures and a sea water main pipe (5);

The two hull structures are respectively provided with an opening, the hull structure far away from the sea water main pipe is a first hull structure (1), the opening on the first hull structure is a first opening (3), and the first opening is arranged at the top of the first hull structure; the hull structure close to the sea water main pipe is a second hull structure (2), the opening on the second hull structure is a second opening (4), and the second opening is formed in the bottom of the second hull structure.

2. The subsea tank for a bubble drag reducing system of claim 1, wherein the subsea tank is a high-end or low-end subsea tank.

3. A sea chest adapted for use in a bubble drag reducing system according to claim 1, characterised in that a gas permeable tube (7) is provided in the sea chest, the outlet of the gas permeable tube being located on a sea floor grid (8).

4. The ocean bottom box adapted for use in a bubble drag reducing system of claim 1, wherein the volume of the ocean bottom box is expanded to more than 2 structures within the ocean bottom box, i.e. the high-level ocean bottom box is required to expand midship by a distance 2520mm of 2 structural ribs and the low-level ocean bottom box is expanded to 2065mm in height, depending on the hull structure.

5. The ocean bottom adapted for use in a bubble drag reducing system of claim 1, wherein the first and second openings have a flow area greater than the flow area of the seawater manifold.

6. A sea chest adapted for use in a bubble drag reducing system according to claim 1, wherein the top of the sea chest is provided with a plurality of ventilation ports (6).

7. A sea chest adapted for use in a bubble drag reducing system according to claim 1, wherein a plurality of sacrificial anode zinc blocks (9) are disposed within the sea chest.

8. The submarine tank suitable for the bubble drag reducing system according to claim 2, wherein the volume of the high submarine tank is enlarged by expanding the submarine tank structure which is originally close to the midship and then expanding the submarine tank towards the midship; the volume of the low-level submarine tank is enlarged by upwardly enlarging the original top submarine tank structure.

9. The ocean bottom box of claim 6, wherein the top of the ocean bottom box is provided with 6 ventilation openings.

10. The subsea tank for a bubble drag reducing system of claim 7, wherein 12 sacrificial anode zinc blocks are disposed within the subsea tank.