A combined air vent mast for a dual fuel very large container ship

Abstract

The present application relates to a kind of combination air breather mast for dual-fuel ultra large container ship, the bow deck of container ship is provided with main mast structure, the top of main mast structure is provided with first platform, middle part is provided with second platform, the combination air breather mast includes main air breather pipe and auxiliary air breather pipe, main air breather pipe and auxiliary air breather pipe are fixed on main mast structure, first platform is provided with two platform holes, the top of main air breather pipe and auxiliary air breather pipe is higher than the first platform, second platform is also provided with the platform hole for the auxiliary air breather pipe to pass through, main air breather pipe and auxiliary air breather pipe are fixed on main mast structure by multiple pipe clamps and anchor respectively, the bottom of main air breather pipe and auxiliary air breather pipe is higher than bow deck.The main air breather pipe and auxiliary air breather pipe of the present application are ingeniously arranged on the main mast structure at the bow deck of ship body, solve the problem that there is no extra space to arrange air breather mast alone on the deck of container ship.

Description

Technical Field

[0001] This invention relates to the field of ship design, and in particular to a combined ventilated mast for dual-fuel ultra-large container ships. Background Technology

[0002] The fuel tanks of ultra-large container ships are usually located in the cargo hold space below the superstructure. The volatile gases produced by the fuel tanks usually need to be vented to a certain height in the air by a special venting mast. However, the deck of a container ship is almost full of containers, and there is no space to install venting masts on the sides of the superstructure. Since the main mast of a container ship is located at the bow deck and its height is greater than the height value of the venting mast required by the regulations.

[0003] In the prior art, invention patent 201911261721.7 provides a combined foremast that also serves as a liquefied natural gas venting mast, relating to the field of ultra-large container ship technology. Its structure includes a main mast, an upper platform, a lower platform, and at least one vent pipe. The vent pipe is connected to the main mast via a pipeline support structure and passes through the upper and lower platforms. The aforementioned prior art has the following shortcomings: It lacks any description or consideration of the details regarding how the main vent pipe connects to the exhaust pipe from the fuel tank safety valve, a crucial component. Furthermore, it fails to consider how to prevent condensation from forming on the inner wall of the main vent pipe during prolonged low-temperature gas discharge, which could accumulate and flow back into the exhaust pipe, posing a safety hazard. Additionally, the design of the secondary vent pipe is essential, as it is specifically designed to connect to the exhaust pipe from the insulation layer of the fuel tank, considering the possibility of minor leaks in the fuel tank after long-term use. Summary of the Invention

[0004] The purpose of this invention is to design a combined ventilated mast for dual-fuel ultra-large container ships. This invention effectively discharges excess volatile gases and volatile gases accidentally leaked from the fuel tanks to a safe area, solves the placement problem well, and has a simple structural design.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A combined ventilated mast for a dual-fuel ultra-large container ship, wherein a mainmast structure is provided on the bow deck of the dual-fuel ultra-large container ship, a first platform is provided on the top of the mainmast structure, and a second platform is provided in the middle of the mainmast structure. The combined ventilated mast includes a main vent pipe and an auxiliary vent pipe, which are fixed to the mainmast structure. The first platform has two platform holes for the main vent pipe and the auxiliary vent pipe to pass through, and the tops of the main vent pipe and the auxiliary vent pipe are higher than the first platform. The second platform also has platform holes for the auxiliary vent pipe to pass through. Both the main vent pipe and the auxiliary vent pipe are... The main vent pipe and the auxiliary vent pipe are fixed to the main mast structure by multiple clamps and anchors. The bottoms of both the main vent pipe and the auxiliary vent pipe are higher than the bow deck. In the combined vent mast of a dual-fuel ultra-large container ship of the present invention, the bottom of the main vent pipe is connected to the exhaust pipe from the fuel tank safety valve via a main T-shaped tee pipe, and the bottom of the auxiliary vent pipe is connected to the exhaust pipe from the insulation layer space of the fuel tank via an auxiliary T-shaped tee pipe. The bottom of the main vent pipe is provided with a section of bend and a ball valve, and the bottom of the auxiliary vent pipe is provided with a section of bend and a needle valve. The bottom of the main vent pipe is provided with a liquid level alarm detection device on the pipe wall below the main T-shaped tee pipe.

[0007] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, the diameter of each platform hole of the first platform and the second platform is larger than the outer diameter of the corresponding main vent pipe and auxiliary vent pipe. When the main vent pipe and auxiliary vent pipe pass through the first platform and the second platform on the main mast structure, a gap is maintained between the outer wall of the main vent pipe and the platform hole to prevent direct contact.

[0008] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, both the edges of the first platform and the second platform are provided with guardrails.

[0009] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, a plurality of main ventilated pipe clamps are provided between the middle and upper parts of the main ventilated pipe and the main mast structure. The tail of the main ventilated pipe clamp is fixed to the main mast structure, and the clamping part of the main ventilated pipe clamp is clamped on the main ventilated pipe.

[0010] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, a plurality of auxiliary ventilated pipe clamps are provided between the middle and upper parts of the auxiliary ventilated pipe and the main mast structure. The tail of the auxiliary ventilated pipe clamp is fixed to the main mast structure, and the clamping part of the auxiliary ventilated pipe clamp is clamped on the auxiliary ventilated pipe.

[0011] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, multiple polytetrafluoroethylene pads are clamped between the main vent pipe clamp and the auxiliary vent pipe clamp and the corresponding main vent pipe and auxiliary vent pipe.

[0012] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, the outer half-circle of the main vent pipe clamp and the auxiliary vent pipe clamp are both detachable semi-circular structures.

[0013] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, a main ventilated pipe anchor is provided between the bottom of the main ventilated pipe and the main mast structure, and a secondary ventilated pipe anchor is provided between the bottom of the secondary ventilated pipe and the main mast structure.

[0014] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, the arc surfaces of the main ventilator anchor and the auxiliary ventilator anchor are in direct contact with the main ventilator and the auxiliary ventilator respectively and are connected by plug welding.

[0015] Based on the above technical solution, the combined ventilated mast of the present invention for dual-fuel ultra-large container ships has the following technical advantages compared with the prior art:

[0016] 1. The combined ventilated mast of the present invention utilizes the structural features of the original main mast on a fuel ultra-large container ship, and sets up a main vent pipe and an auxiliary vent pipe. The main and auxiliary vent pipes are cleverly arranged on the main mast structure at the bow deck of the hull, solving the problem of not having enough space on the deck of a container ship to arrange a ventilated mast separately.

[0017] 2. The combined ventilated mast of the present invention uses anchors located at the bottom to fix the ventilated pipe to the main mast structure. By adopting a special pipe clamp design, the ventilated pipe is prevented from shaking. A polytetrafluoroethylene pad is set between the pipe clamp and the ventilated pipe, which allows the ventilated pipe to slide up and down to release the displacement caused by vibration and thermal expansion and contraction. At the same time, the pad also has a certain heat insulation property to reduce the impact of low temperature on the main mast structure.

[0018] 3. In the combined venting mast of the present invention, the main venting pipe is connected to the exhaust pipe from the fuel tank safety valve via a main T-shaped tee pipe, and the auxiliary venting pipe is connected to the exhaust pipe from the insulation layer space of the fuel tank via an auxiliary T-shaped tee pipe. This design can effectively discharge excess volatile gases and volatile gases that are accidentally leaked from the fuel tank to a safe area, which has great practical value.

[0019] 4. To prevent excessive condensation buildup and backflow into the T-shaped tee, the combined vent mast of this invention features a curved section and a ball valve at the bottom of the main vent pipe, which continuously discharges low-temperature evaporating gas to drain excess condensation. A liquid level alarm detection device is also installed on the pipe wall below the main T-shaped tee at the bottom of the main vent pipe to alert the crew to open the ball valve for venting. Since the auxiliary vent pipe only discharges low-temperature evaporating gas in the special case of fuel tank leakage, a curved section and a needle valve at the bottom of the auxiliary vent pipe are sufficient to discharge any possible trace amounts of condensation; a liquid level alarm detection device is not required. Attached Figure Description

[0020] Figure 1 This is a front view of the structure of a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention.

[0021] Figure 2 For the present invention Figure 1 Side view.

[0022] Figure 3 For the present invention Figure 1 The “AA” view.

[0023] Figure 4 For the present invention Figure 1 The "BB" view.

[0024] Figure 5 For the present invention Figure 1 The "CC" view.

[0025] Figure 6 For the present invention Figure 1 The “DD” view.

[0026] Figure 7 For the present invention Figure 6 The "View E" view.

[0027] Figure 8 This is a partial enlarged view of the combined ventilated mast clamp and ventilated pipe for a dual-fuel ultra-large container ship according to the present invention.

[0028] The specific meanings of the labels in the diagram are as follows: 1 is the main mast structure, 2 is the first platform, 3 is the second platform, 4 is the main vent pipe, 5 is the auxiliary vent pipe, 6 is the main vent pipe clamp, 7 is the auxiliary vent pipe clamp, 8 is the main vent pipe anchor, 9 is the auxiliary vent pipe anchor, 10 is the main T-type tee, 11 is the auxiliary T-type tee, 12 is the liquid level alarm detection device, 13 is the ball valve, 14 is the needle valve, 15 is the PTFE pad, and 16 is the outer half of the clamp. Detailed Implementation

[0029] The following detailed description of the combined ventilated mast for dual-fuel ultra-large container ships, in conjunction with the accompanying drawings and specific embodiments, aims to provide a clearer understanding of its structural composition and operation. However, this should not be construed as limiting the scope of protection of the present invention.

[0030] like Figure 1 and Figure 2 As shown, this invention is a newly designed modular vent mast for dual-fuel ultra-large container ships. The main idea is to combine the main vent pipe and the auxiliary vent pipe into the main mast structure to form a modular vent mast. This modular vent mast is located on the bow deck of the ultra-large container ship. This modular vent mast fully utilizes the structural features of the original main mast, cleverly arranging the main and auxiliary vent pipes on the main mast structure, solving the problem of insufficient space on the container ship deck for a separate vent mast.

[0031] Specifically, a mainmast structure 1 is provided on the bow deck of a dual-fuel ultra-large container ship. A first platform 2 is provided on top of the mainmast structure 1, and a second platform 3 is provided in the middle of the mainmast structure 1. The combined ventilated mast includes a main vent pipe 4 and an auxiliary vent pipe 5, which are fixed to the mainmast structure 1. The first platform 2 has two platform holes for the main vent pipe 4 and the auxiliary vent pipe 5 to pass through. The tops of the main vent pipe 4 and the auxiliary vent pipe 5 are higher than the first platform 1. The second platform 3 also has platform holes for the auxiliary vent pipe 5 to pass through. The main vent pipe 4 and the auxiliary vent pipe 5 are both fixed to the mainmast structure 1 by multiple pipe clamps and anchors. The bottoms of the main vent pipe 4 and the auxiliary vent pipe 5 are both higher than the bow deck.

[0032] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, such as Figure 3 and Figure 4 As shown, the diameter of each platform hole on the first platform 2 and the second platform 3 is larger than the outer diameter of the corresponding main vent pipe 4 and auxiliary vent pipe 5. When the main vent pipe 4 and auxiliary vent pipe 5 pass through the first platform 2 and the second platform 3 on the main mast structure 1, a gap is maintained between the outer wall of the main vent pipe 4 and the auxiliary vent pipe 5 and the platform hole to prevent direct contact. Guardrails are provided at the edges of both the first platform 2 and the second platform 3. The guardrails improve the safety of operators when inspecting the main vent pipe 4 and auxiliary vent pipe 5 on the first platform 2 and the second platform 3. The main mast structure and the associated first and second platforms, main vent pipe clamps, and auxiliary vent pipe clamps in the above-mentioned combined ventilated mast structure are made of ordinary carbon steel, while the remaining components are made of stainless steel with good low-temperature performance.

[0033] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, such as Figure 5 As shown, multiple main vent pipe clamps 6 are provided between the middle and upper parts of the main vent pipe 4 and the main mast structure 1. The tail of the main vent pipe clamp 6 is fixed to the main mast structure 1, and the clamping part of the main vent pipe clamp 6 is clamped to the main vent pipe 4. Multiple auxiliary vent pipe clamps 7 are provided between the middle and upper parts of the auxiliary vent pipe 5 and the main mast structure 1. The tail of the auxiliary vent pipe clamp 7 is fixed to the main mast structure 1, and the clamping part of the auxiliary vent pipe clamp 7 is clamped to the auxiliary vent pipe 5.

[0034] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, such as Figure 8 As shown, the outer half-circle 16 of both the main vent pipe clamp 6 and the auxiliary vent pipe clamp 7 are detachable semi-circular structures. This detachable design facilitates the installation and maintenance of the main vent pipe 4 and the auxiliary vent pipe 5. Multiple polytetrafluoroethylene (PTFE) pads 15 are clamped between the main vent pipe clamp 6 and the auxiliary vent pipe clamp 7 and their corresponding main vent pipe 4 and auxiliary vent pipe 5. These PTFE pads 15 have an extremely low coefficient of friction and excellent resistance to both high and low temperatures, allowing the vent pipes to slide up and down while also providing some protection against low-temperature conduction to the clamps.

[0035] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, such as Figure 6 As shown, a main vent pipe anchor 8 is provided between the bottom of the main vent pipe 4 and the main mast structure 1, and a secondary vent pipe anchor 9 is provided between the bottom of the secondary vent pipe 5 and the main mast structure 1. The arc surfaces of the main vent pipe anchor 8 and the secondary vent pipe anchor 9 are in direct contact with the main vent pipe 4 and the secondary vent pipe 5 respectively, and are connected by plug welding. The bracket of the anchor is welded to the main mast structure, and the anchor serves to bear the weight and fix the vent pipe.

[0036] In a combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention, such as Figure 7 As shown, the bottom of the main vent pipe 4 is connected to the exhaust pipe from the fuel tank safety valve via a main T-tee pipe 10, and the bottom of the auxiliary vent pipe 5 is connected to the exhaust pipe from the insulation layer space of the fuel tank via an auxiliary T-tee pipe 11. Figure 7 As shown, the bottom end of the main vent pipe 4 is provided with a section of bend and a ball valve 13, and the bottom end of the auxiliary vent pipe 5 is provided with a section of bend and a needle valve 14. The bottom of the main vent pipe 4 is located below the main T-shaped tee pipe 10 and is provided with a liquid level alarm detection device 12 on the pipe wall.

[0037] Considering that prolonged discharge of cryogenic gas will cause condensation to form on the inner wall of the vent pipe and accumulate at the bottom, to prevent excessive condensation from flowing back into the T-tee, the main vent pipe 4, which continuously discharges cryogenic evaporating gas, has a bend and ball valve 13 at its bottom to discharge excess condensation. A liquid level alarm detection device 12 is also installed on the bottom wall of the main vent pipe 4, below the main T-tee 10, to remind the crew to open the ball valve 13 for discharge. Since the auxiliary vent pipe 5 only discharges cryogenic evaporating gas in the special case of fuel tank leakage, a bend and needle valve 14 at its bottom are sufficient to discharge any possible trace amounts of condensation; a liquid level alarm detection device 12 is not required.

[0038] The installation process of the combined ventilated mast for a dual-fuel ultra-large container ship according to the present invention is roughly as follows:

[0039] First, the main mast structure 1, including the first platform 2, the second platform 3, and the railings along the platform edges, is fabricated and installed. Then, all the main vent pipe clamps 6 and auxiliary vent pipe clamps 7 with the PTFE pads 15 installed are pre-installed in their respective positions on the main mast structure 1. Note that the outer half-circle 16 of the detachable clamps of the main vent pipe clamps 6 and auxiliary vent pipe clamps 7 are not installed at this time.

[0040] Then, after the main vent pipe 4 and the auxiliary vent pipe 5 are manufactured, the main vent pipe anchor 8, the main T-shaped tee pipe 10 and the ball valve 13 are installed on the main vent pipe 4. The liquid level alarm detection device 12 is installed at the corresponding position below the main T-shaped tee pipe 10. The auxiliary vent pipe anchor 9, the auxiliary T-shaped tee pipe 11 and the needle valve 14 are installed on the auxiliary vent pipe 5.

[0041] Then, the main vent pipe 4 and the auxiliary vent pipe 5, with the accessories installed, are hoisted to the corresponding positions above the main mast structure 1. They are then lowered and passed through the openings of the first platform 2 and the second platform 3, with half of each pipe attached to the main vent pipe clamp 6 and the auxiliary vent pipe clamp 7 already installed on the main mast structure 1. They are then slowly lowered to the designated height, and the main vent pipe anchor 8 and the auxiliary vent pipe anchor 9 are welded to the main mast structure for fixation.

[0042] Finally, install PTFE pads 15 on the detachable outer half-circle 16 of the main vent pipe clamp 6 and the auxiliary vent pipe clamp 7, and then wrap these outer half-circle 16 components around the main vent pipe clamp 6 and the auxiliary vent pipe clamp 7 to make them complete.

[0043] Compared with existing technologies, the combined ventilated mast provided by this invention makes full use of the structural features of the original main mast, cleverly arranging the main vent pipe and the auxiliary vent pipe on the main mast structure. This solves the problem of not having enough space on the deck of a container ship to arrange a separate ventilated mast. The vent pipe is fixedly supported on the main mast structure by anchors located at the bottom. The main vent pipe is connected to the exhaust pipe from the safety valve of the fuel tank through a main T-shaped tee pipe, and the auxiliary vent pipe is connected to the exhaust pipe from the insulation layer space of the fuel tank through an auxiliary T-shaped tee pipe. This can effectively discharge excess volatile gases and volatile gases that are accidentally leaked from the fuel tank to a safe area.

[0044] Furthermore, the main and auxiliary vent pipes of this invention are provided with multiple vent pipe clamps between their middle and upper parts and the main mast structure. The tail of each vent pipe clamp is fixed to the main mast structure by a vent pipe anchor. The clamping part of the vent pipe clamp (using a polytetrafluoroethylene pad for a sliding design) is clamped onto the vent pipe. Since the bottom of both the main and auxiliary vent pipes is connected to the exhaust pipe from the fuel tank safety valve via a T-shaped tee pipe, considering that the long-term discharge of low-temperature gas on the inner wall of the vent pipe will produce some condensation that accumulates at the bottom of the vent pipe, in order to prevent excessive condensation from flowing back into the T-shaped tee pipe, and because the main vent pipe continuously discharges low-temperature evaporating gas, a section of bend and ball valve is provided at the bottom of the main vent pipe to discharge excess condensation at any time. In addition, a liquid level alarm detection device is provided on the pipe wall below the main T-shaped tee pipe at the bottom of the main vent pipe to remind the crew to open the ball valve for discharge. Since the auxiliary vent pipe only emits low-temperature evaporative gas in special circumstances such as fuel tank leakage, it is sufficient to install a section of bend and needle valve at the bottom of the auxiliary vent pipe to discharge any possible trace amounts of condensation. There is no need to install a liquid level alarm detection device.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A combined air ventilation mast for a dual fuel very large container ship, which dual fuel very large container ship is provided with a main mast structure (1) on the bow deck, a first platform (2) is provided on the top of the main mast structure (1), and a second platform (3) is provided on the middle of the main mast structure (1), characterized in that, The combined venting mast comprises a main venting pipe (4) and a secondary venting pipe (5), the main venting pipe (4) and the secondary venting pipe (5) are fixed on the main mast structure (1), the first platform (2) is provided with two platform holes for the main venting pipe (4) and the secondary venting pipe (5) to pass through, the top of the main venting pipe (4) and the secondary venting pipe (5) is higher than the first platform (2), the second platform (3) is also provided with a platform hole for the secondary venting pipe (5) to pass through, the main venting pipe (4) and the secondary venting pipe (5) are fixed on the main mast structure (1) through a plurality of pipe clamps and anchor fasteners respectively, the bottom of the main venting pipe (4) and the secondary venting pipe (5) is higher than the bow deck, the bottom of the main venting pipe (4) is connected with the exhaust pipe from the fuel tank safety valve through a main T-shaped three-way pipe (10), the bottom of the secondary venting pipe (5) is connected with the exhaust pipe from the fuel tank insulation space through a secondary T-shaped three-way pipe (11), the bottom end of the main venting pipe (4) is provided with a section of elbow pipe and a ball valve (13), the bottom end of the secondary venting pipe (5) is provided with a section of elbow pipe and a needle valve (14), the bottom of the main venting pipe (4) is provided with a liquid level alarm detection device (12) on the lower pipe wall of the main T-shaped three-way pipe (10). A plurality of main venting pipe clamps (6) are arranged between the middle and upper portions of the main venting pipe (4) and the main mast structure (1), the tail of the main venting pipe clamp (6) is fixed on the main mast structure (1), the clamping portion of the main venting pipe clamp (6) is clamped on the main venting pipe (4), a plurality of secondary venting pipe clamps (7) are arranged between the middle and upper portions of the secondary venting pipe (5) and the main mast structure (1), the tail of the secondary venting pipe clamp (7) is fixed on the main mast structure (1), the clamping portion of the secondary venting pipe clamp (7) is clamped on the secondary venting pipe (5), a plurality of polytetrafluoroethylene pads (15) are clamped between the main venting pipe clamp (6) and the secondary venting pipe clamp (7) and the corresponding main venting pipe (4) and secondary venting pipe (5).

2. A combined air vent mast for a dual fuel very large container ship according to claim 1, characterized in that The diameter of each platform hole of the first platform (2) and the second platform (3) is greater than the outer diameter of the corresponding main venting pipe (4) and secondary venting pipe (5), when the main venting pipe (4) and the secondary venting pipe (5) pass through the first platform (2) and the second platform (3) on the main mast structure (1), a gap is reserved between the outer wall of the main venting pipe (4) and the secondary venting pipe (5) and the platform hole to prevent direct contact.

3. A combined air vent mast for a dual fuel very large container ship according to claim 1, characterized in that, The edges of the first platform (2) and the second platform (3) are provided with guardrails.

4. A combined air vent mast for a dual fuel very large container ship according to claim 1, characterized in that, The outer half circle (16) of the main venting pipe clamp (6) and the secondary venting pipe clamp (7) is a detachable half circle structure.

5. A combined air vent mast for a dual fuel very large container ship according to claim 1, characterized in that, The main venting pipe anchor fastener (8) is arranged between the bottom of the main venting pipe (4) and the main mast structure (1), the secondary venting pipe anchor fastener (9) is arranged between the bottom of the secondary venting pipe (5) and the main mast structure (1).

6. A combined air vent mast for a dual fuel very large container ship according to claim 5, characterized in that, The circular arc surfaces of the main and secondary venting tube anchoring members (8) and (9) are in direct surface contact with the main and secondary venting tubes (4) and (5) respectively and are connected by plug welding.

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