Safe ventilation system of liquefied gas transport ship

Abstract

The utility model discloses a safety ventilation system of a liquefied gas transport ship, which is characterized in that a cargo tank is arranged on the liquefied gas transport ship and is used for storing liquefied gas; the ventilation part is arranged on a deck of the liquefied gas ship and comprises a ventilation mast, a ventilation main pipe and a ventilation cap, the ventilation mast is arranged on the deck, the ventilation main pipe is in through connection with the cargo tank on the ventilation mast, and the ventilation cap is in through connection with the ventilation main pipe and used for discharging liquefied gas steam generated in the cargo tank outwards. According to the safety ventilation system of the liquefied gas transport ship, the ventilation main pipe is centrally arranged in a living area away from a stern building (close to the bow as much as possible) through the ventilation masts, and the ventilation main pipe is communicated and connected with the cargo tank through the ventilation branch pipes so as to centrally discharge liquefied gas steam outwards; the integration level, the arrangement reasonability and the concentration of dangerous areas of the ventilation system are remarkably improved, meanwhile, the ventilation cap is arranged, the steam concentration of liquefied gas before the liquefied gas is discharged outwards through the ventilation cap is remarkably reduced, and then the dangerous areas around the ventilation cap are remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of marine equipment technology, and more specifically, to a safety ventilation system for liquefied gas transport ships. Background Technology

[0002] Natural gas, as a clean and efficient energy source, is playing an increasingly important role in my country's energy consumption. With the continuous rise in inland demand for natural gas, the layout of LNG receiving terminals along the Yangtze River has been fully launched. Currently, using ships to transport LNG is the most feasible method for replenishing these riverside terminals.

[0003] Currently, liquefied gas carriers typically employ freestanding vent masts, meaning each vent mast is distributed across an open deck above the cargo tanks in the cargo area, with a designated danger zone around each mast. This independent, distributed arrangement of vent masts increases the danger zone at the mast exits, significantly impacting the selection of electrical equipment and the layout of ventilation systems, particularly in small and medium-sized vessels.

[0004] Therefore, designing a highly integrated and low-risk venting system for liquefied gas transport vessels is of significant application value. Utility Model Content

[0005] To overcome the above-mentioned defects, this utility model provides a safety ventilation system for liquefied gas transport ships, specifically adopting the following technical solution:

[0006] A safety ventilation system for liquefied gas transport vessels, comprising:

[0007] Cargo tanks, which are installed on liquefied gas ships, are used to store liquefied gas;

[0008] A venting component is installed on the deck of the liquefied gas vessel. The venting component includes a venting mast, a venting main pipe, and a venting cap. The venting mast is installed on the deck. The venting main pipe is connected to the cargo tank through the venting mast. The venting cap is connected to the venting main pipe through the venting mast. The venting component is used to discharge liquefied gas vapor generated in the cargo tank.

[0009] Preferably, the cargo tank includes a deck tank, a No. 1 cargo tank, and a No. 2 cargo tank. The No. 1 cargo tank and the No. 2 cargo tank are both installed in the hull of the liquefied gas vessel, and the deck tank is located on the deck.

[0010] Preferably, a deck tank platform is provided on the top side of the deck tank, and the deck tank platform is equipped with an inclined ladder or a straight ladder.

[0011] Preferably, the venting mast is connected to the deck tank platform, and the top of the venting mast is provided with a maintenance platform and railings surrounding the venting cap; the main venting pipe is set within the frame of the venting mast, and the main venting pipe is connected to the deck tank, the No. 1 cargo tank and the No. 2 cargo tank respectively through venting branch pipes.

[0012] Preferably, the vent cap includes a liquefied gas venting element and a liquefied gas dilution element, wherein the liquefied gas venting element is disposed on the venting main pipe, and the liquefied gas dilution element is disposed on the liquefied gas venting element.

[0013] Preferably, the liquefied gas venting component includes a venting discharge pipe, a first flange, and a venting baffle. The first flange is disposed at the bottom end of the venting discharge pipe and is used for detachable through-connection with the main venting pipe. The venting baffle is disposed at the top end of the venting discharge pipe.

[0014] Preferably, the top sidewall of the vent pipe is provided with a vent hole for discharging the liquefied gas vapor outward.

[0015] Preferably, the ventilated exhaust pipe is wrapped with a ventilated filter or a fireproof mesh.

[0016] Preferably, the liquefied gas dilution component includes a breathable dilution protective shell and an air-induced dilution component, wherein the breathable dilution protective shell is fitted onto the breathable discharge pipe, and the air-induced dilution component is disposed on the breathable dilution protective shell.

[0017] Preferably, the air dilution component includes an air relay pipe, an air compressor pipe, and an air duct. One end of the air relay pipe is connected to the side wall of the breathable dilution protective shell, and the smaller end of the air compressor pipe is connected to the other end of the air relay pipe, with the larger end of the air compressor pipe facing the bow. One end of the air duct extends into the breathable dilution protective shell, and the side wall of the air duct is connected to one end of the air relay pipe.

[0018] This utility model has at least the following beneficial effects:

[0019] 1) The safety ventilation system for liquefied gas transport vessels of this utility model has a high degree of integration, a reasonable layout design for the liquid cargo piping system, and a concentrated and small dangerous area;

[0020] 2) The safety ventilation system for liquefied gas transport ships of this utility model centrally arranges the main ventilation pipes away from the stern deck living area (as close to the bow as possible) through the ventilation mast, and the main ventilation pipes are connected to the cargo tanks through ventilation branch pipes to centrally discharge liquefied gas vapors to the outside, which significantly improves the integration, rationality of the layout and concentration of dangerous areas of the ventilation system.

[0021] 3) The safety ventilation system for liquefied gas transport vessels of this utility model is equipped with a ventilation cap, which includes a liquefied gas venting component and a liquefied gas dilution component. The liquefied gas dilution component introduces a large amount of air to fully mix with the liquefied gas vapor discharged from the liquefied gas venting component, so as to significantly reduce the concentration of the liquefied gas vapor before it is discharged outward through the ventilation cap, thereby significantly reducing the danger zone around the ventilation cap.

[0022] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0023] Figure 1 This is a front view of the liquefied gas transport ship safety ventilation system of this utility model;

[0024] Figure 2 This is a side front view of the safety ventilation system for liquefied gas transport vessels of this utility model;

[0025] Figure 3 This is a three-dimensional structural diagram of the safety ventilation system for liquefied gas transport vessels of this utility model;

[0026] Figure 4 This is a three-dimensional structural diagram of the vent cap in the safety venting system for liquefied gas transport vessels of this utility model;

[0027] Figure 5 This is a bottom-view three-dimensional structural diagram of the vent cap in the safety venting system for liquefied gas transport vessels of this utility model.

[0028] Figure 6 This is a top view of the vent cap in the liquefied gas transport ship safety ventilation system of this utility model;

[0029] Figure 7 This utility model relates to a safety ventilation system for liquefied gas transport vessels. Figure 6 Front view of the cross section along the AA direction;

[0030] Figure 8 This utility model relates to a safety ventilation system for liquefied gas transport vessels. Figure 6 Schematic diagram of the three-dimensional structure in the AA direction.

[0031] Wherein: 1-Deck tank, 2-Deck tank platform, 3-Ventilation mast, 4-Ventilation main pipe, 5-Ventilation cap, 6-First ventilation branch pipe, 7-Second ventilation branch pipe, 8-Third ventilation branch pipe, 9-Ventilation discharge pipe, 10-First flange, 11-Ventilation baffle, 12-Ventilation through hole, 13-Ventilation dilution protective shell, 14-Leakage hole, 15-Air relay pipe, 16-Air compression pipe, 17-Air exhaust pipe. Detailed Implementation

[0032] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and through embodiments. It should be noted that the description of these embodiments is for the purpose of helping to understand this utility model, but does not constitute a limitation on this utility model.

[0033] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0034] according to Figures 1-8 As shown, a safety venting system for a liquefied gas transport vessel includes a cargo tank and a venting component. Both the cargo tank and the venting component are installed on the liquefied gas vessel, and the venting component is connected in communication with the cargo tank to discharge liquefied gas vapor. The cargo tank includes a deck tank 1, a No. 1 cargo tank, and a No. 2 cargo tank. The No. 1 and No. 2 cargo tanks are installed within the hull of the liquefied gas vessel, while the deck tank 1 is located on the deck of the liquefied gas vessel.

[0035] Alternatively, the deck tank 1 has a capacity of 40m³. 3 Independent of and similar to a cargo tank, it serves the cargo system. The deck tank 1 is located directly in front of cargo tank #1. A deck tank platform 2 is provided on the top side of the deck tank 1. The deck tank platform 2 is approximately 18140-14130 = 4000mm away from the deck, and the deck tank platform 2 requires a separate inclined ladder or straight ladder.

[0036] The venting system includes a venting mast 3, a venting main pipe 4, and venting caps 5. The venting mast 3 is mounted on the deck, the venting main pipe 4 is mounted on the venting mast 3, and the venting caps 5 are mounted on the venting main pipe 4. The venting mast 3 is located to the right of the deck tank 1 (thus avoiding the view from the wheelhouse), and the venting mast 3 is connected to the deck tank platform 2, thus concentrating all hazards in one area. Since the venting mast 3 is connected to the deck tank platform 2, it can be accessed via a shared ladder. The venting mast 3 is located at a strong structural point on the main deck and uses a frame structure constructed from 140x140x8 square tubing. A maintenance platform and railings are arranged on the top of the venting mast 3, surrounding the two venting caps 5.

[0037] The main venting pipe 4 (φ457*9.53) is fixed within the frame of the venting mast 3. One end of the main venting pipe 4 is closed and fixedly mounted on the deck, meaning that the main venting pipe 4 connects to the branch pipe to the venting cap 5 on one hand, and also serves as a support column on the other. Furthermore, there are two main venting pipes 4, arranged parallel to each other on the venting mast 3. One main venting pipe 4 is connected to a first venting branch pipe 6 and a second venting branch pipe 7. The free end of the first venting branch pipe 6 extends through and connects to the No. 1 cargo tank after two 90-degree bends. The other end of the second venting branch pipe 7 is connected through and connects to the deck tank 1. The other main venting pipe 4 is connected to a third venting branch pipe 8. The free end of the third venting branch pipe 8 extends horizontally and vertically along the walkway (located above the main channel) and connects through and connects to the No. 2 cargo tank. This eliminates the need for complicated and winding routes, saves a lot of ventilation pipes (φ323.9*9.53), and makes on-site construction much easier.

[0038] The vent cap 5 includes a liquefied gas venting component and a liquefied gas dilution component. The liquefied gas venting component is disposed on the venting main pipe 4, and the liquefied gas dilution component is disposed on the liquefied gas venting component.

[0039] The liquefied gas venting component includes a vent pipe 9, a first flange 10, and a vent baffle 11. The first flange 10 is fixedly connected to the bottom end of the vent pipe 9 for detachable through-connection with the main vent pipe 4. Further, a vent hole 12 is provided on the side wall of the other end of the vent pipe 9. One end of the vent hole 12 communicates with the inner wall of the vent pipe 9, and the other end communicates with the outer wall of the vent pipe 9. The horizontal distance from one end of the vent hole 12 to the axis of the vent pipe 9 is less than the horizontal distance from the other end of the vent hole 12 to the axis of the vent pipe 9.

[0040] Alternatively, the vent holes 12 can also be designed in a spiral shape, so that the liquefied gas vapor in the vent discharge pipe 9 is discharged outward in a spiral shape after being discharged through the vent holes 12, thereby improving the thorough mixing of the liquefied gas with the air introduced by the liquefied gas dilution element. Four vent holes 12 are provided, and the four vent holes 12 are evenly distributed around the vent discharge pipe 9.

[0041] The ventilated baffle 11 is umbrella-shaped and is fixedly sealed at the other end of the ventilated discharge pipe 9. During rain, the ventilated baffle 11 prevents rainwater from falling into the ventilated discharge pipe 9. Furthermore, the ventilated baffle 11 cooperates with the liquefied gas dilution component to improve the mixing efficiency of the liquefied gas and air. Alternatively, the ventilated discharge pipe 9 may be wrapped with a breathable filter or a fireproof mesh, or a combination thereof.

[0042] The liquefied gas dilution component includes a breathable dilution protective shell 13 and an air-induced dilution component. The breathable dilution protective shell 13 is disposed on the breathable discharge pipe 9, and the air-induced dilution component is disposed on the breathable dilution protective shell 13. The breathable dilution protective shell 13 is fixedly fitted onto the outer wall of the other end of the breathable discharge pipe 9 through a mounting through hole on its bottom surface, and the breathable through hole 12 is located inside the breathable dilution protective shell 13. At the same time, the axis of the breathable dilution protective shell 13 coincides with the axis of the breathable discharge pipe 9.

[0043] Furthermore, the ventilated dilution protective shell 13 is cylindrical in shape, with a concave conical bottom surface. A drainage hole 14 is provided at the edge of the bottom surface. When rainwater enters the ventilated dilution protective shell 13, it will drain through the drainage hole 14. The opening of the ventilated dilution protective shell 13 is open and convex (frustum-shaped) to improve the mixing of the liquefied gas and air, further reducing the concentration of hydraulic gas discharged from the opening, thereby minimizing the volume of the hazardous area around the vent cap 5.

[0044] The air dilution system includes an air relay pipe 15, an air compressor pipe 16, and an air duct 17. One end of the air relay pipe 15 is connected to the side wall of the breathable dilution protective shell 13. The air compressor pipe 16 is flared, with its smaller end connected to the other end of the air relay pipe 15, and its larger end facing the bow. The diameter of the air duct 17 is larger than that of the air compressor pipe 16. One end of the air duct 17 extends into the breathable dilution protective shell 13, and the axis of the air duct 17 is parallel to the tangent of the breathable dilution protective shell 13. The side wall of the air duct 17 is connected to one end of the air relay pipe 15. The angle between the axis of the air duct 17 and the axis of the air relay pipe 15 is less than 45 degrees.

[0045] When the liquefied gas vessel is sailing at high speed, air enters the air compression pipe 16, is compressed by the air compression pipe 16, and then enters the air relay pipe 15 at high speed. After being guided by the air relay pipe 15, it is injected into the air vent 17 at high speed and enters the breathable dilution protective shell 13 from one end of the air vent 17. Due to the increased air velocity and decreased pressure at one end of the air vent 17, a large amount of external air will rush into the other end of the air vent 17 and finally be injected into the breathable dilution protective shell 13 from one end of the air vent 17. There, it mixes thoroughly with the liquefied gas vapor, effectively reducing the concentration of the liquefied gas, and then is discharged from the outlet of the breathable dilution protective shell 13.

[0046] As described above, the liquefied gas transport vessel safety venting system of this utility model has a high degree of integration, a reasonable layout design for the liquid cargo piping system, and a concentrated and small hazardous area. Specifically, the venting system of this utility model centrally arranges the venting main pipe away from the stern deck living area (as close to the bow as possible) through the venting mast, and the venting main pipe is connected to the cargo tank through venting branch pipes to centrally discharge liquefied gas vapor, which significantly improves the integration, rationality of the layout, and concentration of the hazardous area of ​​the venting system. At the same time, the venting system of this utility model is equipped with a venting cap, which includes a liquefied gas venting component and a liquefied gas dilution component. The liquefied gas dilution component introduces a large amount of air to fully mix with the liquefied gas vapor discharged from the liquefied gas venting component, so as to significantly reduce the concentration of the liquefied gas vapor before it is discharged through the venting cap, thereby significantly reducing the hazardous area around the venting cap.

[0047] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A safety ventilation system for liquefied gas transport vessels, characterized in that, include: Cargo tanks, which are installed on liquefied gas ships, are used to store liquefied gas; A venting component is installed on the deck of the liquefied gas vessel. The venting component includes a venting mast, a venting main pipe, and a venting cap. The venting mast is installed on the deck. The venting main pipe is connected to the cargo tank through the venting mast. The venting cap is connected to the venting main pipe through the venting mast. The venting component is used to discharge liquefied gas vapor generated in the cargo tank.

2. The safety ventilation system for liquefied gas transport vessels according to claim 1, characterized in that, The cargo tanks include a deck tank, a No. 1 cargo tank, and a No. 2 cargo tank. Both the No. 1 and No. 2 cargo tanks are installed in the hull of the liquefied gas vessel, and the deck tanks are located on the deck.

3. The safety ventilation system for liquefied gas transport vessels according to claim 2, characterized in that, A deck tank platform is provided on the top side of the deck tank, and the deck tank platform is equipped with inclined ladders or straight ladders.

4. The safety ventilation system for liquefied gas transport vessels according to claim 3, characterized in that, The venting mast is connected to the deck tank platform, and a maintenance platform and railings are arranged on the top of the venting mast surrounding the venting cap; the main venting pipe is set inside the frame of the venting mast, and the main venting pipe is connected to the deck tank, the No. 1 cargo tank and the No. 2 cargo tank respectively through venting branch pipes.

5. The safety ventilation system for liquefied gas transport vessels according to any one of claims 1-4, characterized in that, The vent cap includes a liquefied gas venting component and a liquefied gas dilution component. The liquefied gas venting component is disposed on the venting main pipe, and the liquefied gas dilution component is disposed on the liquefied gas venting component.

6. The safety ventilation system for liquefied gas transport vessels according to claim 5, characterized in that, The liquefied gas venting component includes a venting pipe, a first flange, and a venting baffle. The first flange is disposed at the bottom end of the venting pipe and is used for detachable through-connection with the main venting pipe. The venting baffle is disposed at the top end of the venting pipe.

7. The safety ventilation system for liquefied gas transport vessels according to claim 6, characterized in that, The top side wall of the vent pipe is provided with a vent hole for discharging the liquefied gas vapor outward.

8. The safety ventilation system for liquefied gas transport vessels according to claim 6 or 7, characterized in that, The ventilated exhaust pipe is wrapped with a breathable filter or fireproof mesh.

9. The safety ventilation system for liquefied gas transport vessels according to claim 6, characterized in that, The liquefied gas dilution component includes a breathable dilution protective shell and an air-induced dilution component. The breathable dilution protective shell is fitted onto the breathable discharge pipe, and the air-induced dilution component is disposed on the breathable dilution protective shell.

10. The safety ventilation system for liquefied gas transport vessels according to claim 9, characterized in that, The air dilution unit includes an air relay pipe, an air compressor pipe, and an air duct. One end of the air relay pipe is connected to the side wall of the breathable dilution protective shell. The small end of the air compressor pipe is connected to the other end of the air relay pipe, and the large end of the air compressor pipe faces the bow. One end of the air duct extends into the breathable dilution protective shell, and the side wall of the air duct is connected to one end of the air relay pipe.

Images