Methanol dual-fuel container ship venting structure combining a vent tube with a lashing bridge

Abstract

The present application relates to a kind of methanol dual-fuel container ship vent structure of vent pipe and binding bridge combination, including fuel tank, vent pipe, binding bridge, vent pipe is arranged on the binding bridge near fuel tank, can avoid the large amount of double-wall pipe used in the passage of conventional foremast vent, and vent pipe uses single-wall welded steel pipe, to reduce production construction cost.Vent pipe is led out from fuel tank, transversely passes through hatch coaming structure, then is arranged forward along the lower end space of hatch coaming transverse elbow plate until binding bridge, subsequently turns up hatch coaming and extends to the third column inside third column outside binding bridge, extends to the PV valve of the top end elevated platform of binding bridge along column upward.The structure can better protect the vent pipe exposed to the outside, improve safety, and the length of vent pipe is greatly shortened compared with conventional method, and conventional welded steel pipe can be used, to save construction cost.

Description

Technical Field

[0001] This invention relates to a methanol dual-fuel container ship, and more particularly to a ventilation structure for a methanol dual-fuel container ship that combines a vent pipe with a lashing bridge. Background Technology

[0002] With the increasing international emphasis on energy conservation and emission reduction, methanol, as a clean energy source, is being used more and more as a fuel for ships. Large dual-fuel container ships typically utilize dedicated vent masts built in the superstructure or engine room to accommodate venting systems, or integrate venting systems with the foremast, to reduce the adverse impact of hazardous areas on the design.

[0003] However, existing solutions have the following drawbacks: Leading the vent pipe from the fuel tank to the foremast requires a considerable length of double-walled pipe in the side walkway; furthermore, to reduce the resistance of methanol vapor in the pipes, a vent pipe with a diameter of 200mm or more is needed, increasing overall construction costs. Placing the vent mast in the superstructure requires raising its height due to the impact of the hazardous area on the compass deck's electrical equipment, making it difficult to meet ship height restrictions. Alternatively, an enclosed bridge could be used, increasing structural weight and thus construction costs. Summary of the Invention

[0004] To address the problems of existing technologies, this invention proposes a venting structure for methanol dual-fuel container ships that combines a vent pipe with a lashing bridge, positioned on the second lashing bridge forward of the superstructure. The vent pipe extends from the fuel tank, passes laterally through the hatch coaming structure, and then runs forward along the space below the transverse elbow plate of the hatch coaming until it reaches the lashing bridge. It then flips up over the hatch coaming and extends into the ship to the third column outside and inward of the lashing bridge. From there, it extends upward along the column to the raised platform at the top of the lashing bridge where a PV valve is located. This structure effectively protects the exposed vent pipe, improving safety. Furthermore, the length of the vent pipe is significantly reduced compared to conventional methods, and conventional welded steel pipes can be used, thus saving construction costs.

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

[0006] A ventilation structure for a methanol dual-fuel container ship combining a vent pipe and a lashing bridge includes a fuel tank, a vent pipe, and a lashing bridge. The vent pipe is arranged on the lashing bridge near the fuel tank, which avoids the use of a large number of double-walled pipes in the passageway of conventional foremast ventilation. Moreover, the vent pipe is made of single-walled welded steel pipe, thereby reducing production and construction costs.

[0007] Furthermore, the vent pipe extends from the top of the fuel tank, passes through the hatch coaming structure, and is positioned between the elbow plate below the hatch coaming and the main deck, with a protective structure one arranged on the side near the walkway. The vent pipe then extends along the length of the ship to the lashing bridge, and within the protected space of the second protective structure, it extends vertically to the top plate of the hatch coaming and is arranged laterally towards the middle of the ship. When the vent pipe extends laterally to the protective square tube of the venting lift platform near the middle of the ship, it passes through a bend from the inside of the lashing bridge to the outside of the lashing bridge, and is arranged vertically upward within the enclosed space formed by the protective square tube and the vent pipe protective frame. When the vent pipe is arranged vertically below the venting lift platform, it passes through a bend to the bottom of the platform plate of the venting lift platform and upward through the platform plate, where a vent cap and a PV valve are arranged.

[0008] Furthermore, the height of the vent cap and PV valve should not exceed the height of the horizontal square tube.

[0009] Furthermore, the vent pipes are arranged within the area of ​​the hatch coaming as viewed from above, and a protective structure is arranged on the outer side.

[0010] Furthermore, the second protective structure is H-shaped and composed of angle steel. It is connected to the first-floor platform of the lashing bridge and the main deck at the top and bottom, and to the hatch coaming structure at the bottom and top.

[0011] Furthermore, the size of the protective square tube is larger than the longitudinal dimension of the vent tube after installation, and it must not interfere with the large hatch cover accessories; no binding eye plate structure is arranged on the side of the protective square tube near the vent tube.

[0012] Furthermore, the vent pipe protection frame is composed of angle steel. The lower end of the vertical angle steel is connected to the hatch coaming and the upper end extends above the vent pipe. It is connected to the protective square tube and the lashing bridge respectively through horizontal angle steel.

[0013] Furthermore, the ventilated elevated platform is equipped with railings and warning signs to prevent unauthorized personnel from accidentally entering.

[0014] Furthermore, the first protective structure is a detachable structure, consisting of square steel steps, supporting angle steel, base angle steel, and fixing bolts. The first protective structure also serves as the protection for the large hatch louver steps and the ventilation pipe.

[0015] Furthermore, the platform of the lash bridge located within the danger zone is equipped with explosion-proof human body detectors, and warning devices are installed in the driver's cab to serve as a warning when personnel are working in the relevant area.

[0016] The advantages of this invention compared to existing technologies, due to the adoption of the above-mentioned technology, are as follows:

[0017] 1. By arranging vent pipes on the lashing bridge closer to the fuel tank, the conventional use of a large number of double-walled pipes in the passageway for foremast venting is avoided, and the single-walled pipes are made of welded steel pipes, thereby reducing production and construction costs.

[0018] 2. The hazardous area of ​​this ventilation scheme is a certain distance away from the superstructure, which avoids the adverse effects of ventilating the superstructure on electrical equipment. The electrical equipment can be non-explosion-proof, reducing procurement costs.

[0019] 3. The vent pipe runs beneath the hatch coaming, curves up along the coaming to the top, extends inward to the protective square tube of the lashing bridge, and then extends upward along the columns inside the protective structure to the lifting platform. PV valves and other structures are installed within the height of the protective structure at the top of the platform. The entire vent pipe is well protected, effectively preventing damage from external impacts and improving the safety and stability of the venting system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the longitudinal general arrangement of the ventilation structure of a methanol dual-fuel container ship combining a vent pipe and a lashing bridge according to the present invention.

[0021] Figure 2 This is a schematic diagram of the lateral general arrangement of the ventilation structure of a methanol dual-fuel container ship combining a vent pipe and a lashing bridge according to the present invention.

[0022] Figure 3 This is a schematic diagram of the lateral arrangement of the lashing bridge at the ventilation structure of a methanol dual-fuel container ship, which combines a vent pipe and a lashing bridge according to the present invention.

[0023] Figure 4 Top view of the lashing platform;

[0024] Figure 5 A top view of the raised platform specifically designed for arranging vent pipes;

[0025] Figure 6 for Figure 3 A sectional view (AA) of the hatch coaming on the side of the ship, viewed from midship.

[0026] Figure 7 for Figure 3 BB cross-sectional view of the location of the protective square tube;

[0027] Figure 8 This is a transverse view of the vent pipe below the conventional hatch coaming;

[0028] Figure 9 This is a longitudinal view of the vent pipe below the conventional hatch coaming. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0030] Please see Figures 1 to 9In an embodiment of the present invention, a ventilation structure for a methanol dual-fuel container ship combining a vent pipe and a lashing bridge is shown. This structure includes a fuel tank 1, a hatch coaming structure 2, a vent pipe 3, a lashing bridge 4 for arranging the vent pipe, an enlarged protective square tube 41 for the vent pipe on the lashing bridge, a horizontal square tube 42 on the top of the lashing bridge's raised platform to protect the vent cap and other structures from container impacts, an explosion-proof human detection detector 43 arranged within the danger zone on the lashing bridge platform, railings and warning signs 44 arranged on the raised platform to prevent people from entering the ventilation area, a raised platform 45 specifically for arranging the vent pipe for non-lashing operations, a second protective structure 51 between the lashing bridge and the main deck to protect the vent pipe, a vent pipe protection frame 52 on the lashing bridge to protect the vent pipe on the outside of the bridge, and a detachable protective structure 6 on the outside of the hatch coaming that protects the vent pipe and also serves as a step for the large hatch cover louvers.

[0031] Fuel tank 1 is located below the superstructure. The end of vent pipe 3 is connected to the top of fuel tank 1, from which high-pressure methanol vapor is drawn out from the fuel tank. Vent pipe 3 is arranged on the port and starboard sides below the superstructure, passing through the structural opening reserved for the vent pipe in hatch coaming 2, and then reaching the port and starboard sides of the ship.

[0032] The hatch coaming 2, located in the area below the main deck, features a specially designed transverse elbow plate for the arrangement of the vent pipe 3. The vent pipe 3 is positioned within the space beneath the transverse elbow plate of the hatch coaming 2, ensuring that the vertical projection of the vent pipe 3 does not extend beyond the hatch coaming 2, thus preventing damage to the vent pipe 3 from falling objects. Protective structures 6 are arranged at regular intervals on the side of the vent pipe near the walkway to prevent lateral impacts from objects on the walkway onto the vent pipe 3.

[0033] The vent pipe 3 extends upwards along the hatch coaming 2 to the position of the lashing bridge 4, then folds out from under the hatch coaming 2 and extends within the space enclosed by the second protective structure 51 to the top plate of the hatch coaming, and then extends into the ship along the transverse top plate of the hatch coaming. In this process, the vent pipe 3 is arranged inside the lashing bridge and within a 750mm range between the fore and aft pillars, and is located below the first-level platform.

[0034] When the vent pipe 3 reaches the protective square tube 41, the vent pipe 3 extends out of the bridge from the inside of the tying bridge and below the first-floor platform through a bend, and is vertically arranged inside the structure formed by the vent pipe protection frame 52, the protective square tube 41, and the tying bridge deck, extending upwards to below the ventilated lifting platform 45. During this process, the vent pipe 3 is completely protected by the protective square tube 41 and the vent pipe protection frame 52.

[0035] When the vent pipe 3 reaches below the ventilated lifting platform 45, it passes through an elbow, once again from the outside of the binding bridge to the inside of the binding bridge, below the platform plate of the ventilated lifting platform 45, and then vertically upwards out of the platform plate. The vent cap and PV valve 31 are installed at the end of the vent pipe 3 at this point.

[0036] The aforementioned lashing bridge 4 is equipped with explosion-proof human body detectors 43 at both ends of the platform within the danger zone, and feedback devices are installed in the driver's cab and other locations to warn whether anyone is near the ventilation pipe, thereby increasing vigilance.

[0037] The cross-sectional dimensions of the aforementioned protective square tube 41 should be slightly larger than the position of the vent tube 3 after installation, and should not be too large to interfere with the large hatch cover accessories, so as to achieve the protective function of the vent tube 3. No binding plates or other structures should be installed on the protective square tube near the vent tube 3.

[0038] The aforementioned ventilated lifting platform 45, as an extension of the conventional lifting platform towards the center of the ship by one container, does not require routine lashing. Its four end posts need to be appropriately extended, and square tubes 42 are installed at the top to protect the vent pipe 3 from the risk of impact from falling containers. The height of the vent cap and PV valve after installation should not exceed the height of the square tube 42.

[0039] The aforementioned ventilated lifting platform 45 is equipped with a railing door and a danger warning sign 44 at the connection point between the platform and the ordinary lifting platform near the ship's side, in order to prevent unauthorized personnel from accidentally entering the ventilated lifting platform and causing safety risks.

[0040] The aforementioned vent protection structure 51, in its side view, is an "H"-shaped structure composed of angle steel. Two vertical angle steels are connected to the first-level platform of the lashing bridge and the main deck, respectively. Inside the vertical angle steels, two to three horizontal angle steels are arranged to reinforce and prevent vibration. The vertical angle steels are connected to the side panels of the hatch coaming 2 via the two horizontal angle steels, providing additional reinforcement to the overall structure.

[0041] The aforementioned ventilator protection frame 52 is composed of 50x50mm angle steel, forming an "L" shape when viewed from above. One end connects to the protective square tube 41, and the other end connects to the transverse panel of the lashing bridge. The ventilator 3 is arranged and installed inside the "L"-shaped structure formed by the protection frame 52. The protection frame 52 consists of a continuous vertical angle steel and several horizontal connecting angle steels. The lower end of the vertical angle steel connects to the transverse top plate of the hatch coaming 3, and the upper end extends appropriately beyond the height of the ventilator outside the lashing bridge. The horizontal connecting angle steel consists of one angle steel that connects transversely to the protective square tube 41 and one angle steel that connects longitudinally to the panel of the lashing bridge 4. The folded edge of the transverse angle steel faces the ventilator 3, and the straight edge faces the container to avoid container jamming during lifting. The folded edge of the longitudinal angle steel also faces the ventilator 3. The horizontal connecting angle steels are usually arranged with a 1.5m gap.

[0042] The aforementioned protective structure 6 is positioned according to the location of the louvers, taking into account the clearance. Typically, at least three such structures are placed at each large hatch location. Protective structure 6 consists of step square steel 61, supporting angle steel 62, base angle steel 63, and fixing bolts 64. The arrangement of the step square steel 61 must consider a 300mm step clearance. The length of the supporting angle steel is determined by the relative height of the hatch coaming. The base angle steel 63 and supporting angle steel 62 on one side are connected by two fixing bolts 64. This protective structure 6 can serve both as protection for the vent pipe and as louvers for operating the large hatch via the steps, without affecting the walkway space.

Claims

1. A methanol dual-fuel container ship venting structure combining a vent tube and a lashing bridge, characterized by: The system includes fuel tanks, vent pipes, and lashing bridges. Vent pipes are installed on the lashing bridges near the fuel tanks, avoiding the use of numerous double-walled pipes in conventional foremast venting systems in the passageway. Furthermore, the vent pipes are made of single-walled welded steel pipes, thus reducing production and construction costs. The vent pipes extend from the top of the fuel tanks, pass through the hatch coaming structure, and are positioned between the elbow plate below the hatch coaming and the main deck, with a protective structure (Section 1) installed on the side closest to the passageway. The vent pipes then extend along the length of the ship to the lashing bridge, within the protected space of Protective Structure (Section 2). The vent pipe extends vertically out of the hatch coaming to the top plate of the hatch coaming and is arranged laterally towards the middle of the ship. When the vent pipe extends laterally to the protective square tube position of the vent lift platform near the middle of the ship, it passes through the elbow from the inside of the lashing bridge to the outside of the lashing bridge. Within the enclosed space formed by the protective square tube and the vent pipe protective frame, it is arranged vertically upward. When the vent pipe is arranged vertically to the bottom of the vent lift platform, it passes through the elbow to the bottom of the platform plate of the vent lift platform and upward through the platform plate, where the vent cap and PV valve are installed.

2. The methanol dual fuel container ship venting structure with vent tube and lashing bridge combination of claim 1, wherein: The height of the vent cap and PV valve should not exceed the height of the horizontal square tube.

3. The methanol dual fuel container ship venting structure with vent tube and lashing bridge combination of claim 1, wherein: The vent pipes are arranged within the area of ​​the hatch coaming as viewed from above, and a protective structure is arranged on the outside.

4. The methanol dual fuel container ship venting structure with vent tube and lashing bridge combination of claim 1, wherein: The second protective structure is H-shaped and composed of angle steel. It is connected to the first-floor platform of the lashing bridge and the main deck at the top and bottom, and to the hatch coaming structure at the bottom and side.

5. The methanol dual fuel container ship venting structure with vent pipe and lashing bridge combination of claim 1, wherein: The protective square tube shall be larger than the longitudinal dimension of the vent tube after installation, and shall not interfere with the large hatch cover accessories; no binding eye plate structure shall be arranged on the side of the protective square tube near the vent tube.

6. The methanol dual fuel container ship venting structure with vent tube and lashing bridge combination of claim 1, wherein: The vent pipe protection frame is composed of angle steel. The lower end of the vertical angle steel is connected to the hatch coaming and the upper end extends above the vent pipe. It is connected to the protective square tube and the lashing bridge respectively through horizontal angle steel.

7. The methanol dual fuel container ship venting structure with vent tube and lashing bridge combination of claim 1, wherein: The ventilated elevated platform is equipped with railings, gates, and danger warning signs to prevent unauthorized personnel from entering.

8. The methanol dual fuel container ship venting structure with vent tube and lashing bridge combination of claim 1, wherein: The first protective structure is a detachable structure, consisting of square steel steps, supporting angle steel, base angle steel and fixing bolts. The first protective structure also serves as the protection for the large hatch louver steps and the ventilation pipe.

9. The methanol dual fuel container ship venting structure with vent tube and lashing bridge combination of claim 1, wherein: The lash bridge is equipped with an explosion-proof human body detector on the platform within the danger zone, and a warning device is installed in the driver's cab to serve as a warning when personnel are working in the relevant area.

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