Methanol-fueled ships

Abstract

The application discloses a methanol fuel ship, which comprises a methanol storage cabin and a methanol delivery system for delivering methanol in the methanol storage cabin; the methanol delivery system comprises an out-of-cabin pump, a liquid collecting well and a methanol delivery pipe; the liquid collecting well is located below the methanol storage cabin, the top end of the liquid collecting well is provided with a liquid collecting inlet, the liquid collecting inlet is connected to the bottom of the methanol storage cabin; one end of the methanol delivery pipe is connected to the bottom of the liquid collecting well, and the other end of the methanol delivery pipe is connected to the out-of-cabin pump. The scheme solves the problem of high cost of a traditional in-cabin pump, and realizes the sharing of the out-of-cabin pump by multiple cabins. When the liquid level in the methanol storage cabin changes violently due to the pitching and rolling of the ship in a severe sea state, the methanol liquid in the liquid collecting well can realize the effect of liquid level buffering, the liquid can still smoothly enter the liquid collecting well under the condition of low liquid level or violent shaking, the out-of-cabin pump is prevented from being sucked empty or cavitated, the methanol delivery process can continuously and stably run, and the reliability of the methanol fuel ship in operation is improved.

Description

Technical Field

[0001] This invention relates to the field of marine engineering, and in particular to a methanol-fueled ship. Background Technology

[0002] Driven by the need for carbon emission reduction, methanol is widely used as a clean fuel in ships. Methanol-fueled ships can be either dual-fuel (powered by both marine fuel oil and methanol) or single-fuel (powered solely by methanol). Both require external pumps to transfer methanol from the methanol storage tank to the methanol daily use system. Current technology commonly uses internal pumps (deep-well pumps or submersible pumps) as external pumps. These are completely submerged below the methanol storage tank's surface. Therefore, internal pumps between independent methanol tanks cannot or are difficult to use as backups for each other. This results in each independent methanol tank requiring at least one deep-well pump or two submersible pumps. With more than two methanol storage tanks, the excessive number of internal pumps leads to excessively high overall costs for the methanol delivery system. Furthermore, the cost of a single internal pump is also high. Additionally, internal pumps are difficult to maintain, have long maintenance cycles, and are costly. Maintenance can also disrupt the operation of the entire system.

[0003] Therefore, using external pumps instead of internal pumps to power methanol delivery reduces the overall cost of the methanol delivery system, facilitates inspection, lowers maintenance costs and complexity, and minimizes the impact of maintenance. However, external pumps are susceptible to the effects of sea conditions: during ship operation, especially in severe sea conditions, the ship's pitching and rolling can cause violent sloshing of the liquid in the methanol storage tank, potentially leading to problems such as pump cavitation and other issues that affect the stable operation of the system. Furthermore, external pumps can also easily result in excessive residual liquid in the methanol storage tank, leading to low fuel utilization. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, which uses external pumps instead of internal pumps to provide power for transporting methanol, and is easily affected by sea conditions. The present invention provides a methanol fuel ship.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A methanol-fueled vessel includes a methanol storage tank and a methanol delivery system for delivering methanol from the methanol storage tank.

[0007] The methanol delivery system includes an external pump, a collection well, and a methanol delivery pipeline;

[0008] The liquid collection well is located below the methanol storage tank, and the top of the liquid collection well is provided with a liquid collection inlet, which is connected to the bottom of the methanol storage tank.

[0009] One end of the methanol delivery pipe is connected to the bottom of the collection well, and the other end of the methanol delivery pipe is connected to the external pump.

[0010] In this technical solution, by providing a methanol-fueled vessel, the high cost of traditional internal pumps is solved by utilizing an external pump design, and multiple compartments can share an external pump. Simultaneously, a collection well is installed. When the methanol storage tank experiences drastic level changes due to pitching and rolling in rough sea conditions, the methanol liquid in the collection well acts as a level buffer. Even under low liquid levels or severe rolling conditions, the liquid can still smoothly enter the collection well, preventing cavitation or cavitation in the external pump, ensuring continuous and stable operation of the methanol transportation process, and improving the reliability of the methanol-fueled vessel during operation.

[0011] Preferably, the methanol delivery system further includes a well cover, the top of which is provided with a first liquid collection hole, and the well cover is placed over the liquid collection inlet.

[0012] In this technical solution, the well cover effectively prevents impurities from entering the collection well, while reducing liquid sloshing and overflow, ensuring the stability of the liquid level in the collection well and the maximum amount of liquid retained in the well.

[0013] Preferably, the first collection hole is located on the side of the well cover near the stern of the methanol-fueled vessel.

[0014] In this technical solution, since the ship spends most of its time in stern tilt and a small portion of its time in bow tilt during a pitching cycle, the first collection hole on the well cover is located on the side closer to the stern. This makes it easier for methanol to enter the collection well when the ship is stern tilted, reducing liquid residue. At the same time, it prevents liquid from overflowing from the bow when the ship is bow tilted, further ensuring the effectiveness of the collection well in buffering the liquid level.

[0015] Preferably, the methanol delivery system further includes a replenishment buffer zone located at the bottom of the methanol storage tank and at least partially located at the top of the collection well;

[0016] The replenishment buffer zone is surrounded by a dike;

[0017] The portion of the replenishment buffer zone located at the top of the collection well is provided with a second collection hole.

[0018] In this technical solution, by setting up a liquid replenishment buffer zone, in the event of liquid surge caused by pitching, some liquid can be left inside the cofferdam and then enter the liquid collection well through the second liquid collection hole, effectively slowing down the rate of liquid level drop in the liquid collection well and ensuring the continuous operation of the external pump.

[0019] Preferably, the methanol delivery system further includes a replenishment pipe, a float switch, and a control unit;

[0020] The replenishment pipe is located inside the collection well, and the top end of the replenishment pipe is connected to the second collection hole, while the bottom end of the replenishment pipe is lower than the preset low level of the liquid level in the collection well.

[0021] The float switch is located inside the replenishment tube and is electrically connected to the control unit;

[0022] When the liquid level in the collection well rises to a preset high level, the float switch rises and sends a shutdown signal to the control unit to shut off the replenishment pipe;

[0023] When the liquid level in the collection well drops to the preset low level, the float switch sinks and sends an opening signal to the control unit to open the replenishment pipe.

[0024] In this technical solution, by using a float switch in conjunction with a control unit to control the opening and closing of the replenishment pipe, the state of the replenishment pipe can be automatically adjusted according to the changes in the liquid level in the collection well, ensuring the stability of the liquid level in the collection well, avoiding cavitation or cavitation of the external pump, and improving the efficiency of liquid utilization.

[0025] Preferably, the replenishment tube includes a straight tube and an inclined tube, the top end of the straight tube and the top end of the inclined tube are respectively connected to two adjacent second liquid collection holes, the bottom end of the inclined tube is connected to the middle of the straight tube, and the float switch is located inside the straight tube.

[0026] In this technical solution, by setting up a combination of straight and inclined tubes, the float switch can float vertically along the straight tube, while the structure of the replenishment tube is simple and easy to manufacture.

[0027] Preferably, the methanol delivery system includes two replenishment buffer zones, which are respectively distributed on both sides of the liquid collection inlet along the lateral direction of the methanol-fueled vessel.

[0028] In this technical solution, the above settings can maintain a balanced distribution of liquid when the ship rolls, and at the same time facilitate the flow of residual liquid directly into the liquid collection inlet between the two replenishment buffer zones when the ship pitches, thereby further improving the liquid collection efficiency of the liquid collection well and reducing liquid waste under pitching conditions.

[0029] Preferably, in the transverse direction of the methanol-fueled vessel, the collection well is located near the center of the methanol storage tank; and / or,

[0030] In the longitudinal direction of the methanol-fueled vessel, the collection well is located near the stern of the vessel.

[0031] In this technical solution, by placing the collection well near the middle of the methanol storage tank, residual liquid from all directions within the methanol storage tank can easily flow into the collection well, further improving the liquid collection efficiency of the collection well. Furthermore, by placing the collection well near the stern of a methanol-fueled vessel, it accommodates a situation where the vessel spends most of its pitching cycle stern-listening and a small portion bow-listing, further enhancing the liquid collection efficiency of the collection well.

[0032] Preferably, the bottom of the collection well slopes towards the center; and / or,

[0033] The bottom of the liquid collection well is provided with a filter plate; and / or,

[0034] The methanol delivery system also includes a buffer pipe, the diameter of which is larger than the diameter of the methanol delivery pipe and smaller than the diameter of the collection well. One end of the buffer pipe is connected to the bottom of the collection well, and the other end of the buffer pipe is connected to the methanol delivery pipe.

[0035] In this technical solution, by setting the bottom of the collection well to be inclined towards the middle, it is convenient for residual liquid from all directions at the bottom of the collection well to flow into the methanol delivery pipe.

[0036] By installing filter plates, larger impurities are filtered out, preventing them from entering the downstream methanol delivery pipes and external pumps, reducing equipment wear and blockage risks, and improving the operational stability of methanol-fueled ships.

[0037] By setting up a buffer pipe, the degree of change in the liquid level cross section is slowed down. Since the diameter of the buffer pipe is smaller than that of the liquid collection well, the degree of liquid level fluctuation in the buffer pipe is less than that in the liquid collection well, which further improves the stability of the liquid level, avoids the phenomenon of pumping air into the tank, and reduces the amount of residual liquid during tank cleaning, thereby improving the liquid utilization rate.

[0038] Preferably, the external pump is located below the methanol storage tank; and / or,

[0039] In the transverse direction of the methanol-fueled vessel, the external pump is located close to the vessel's interior; and / or,

[0040] In the longitudinal direction of the methanol-fueled vessel, the external pump is located near the stern of the vessel.

[0041] In this technical solution, by setting the external pump below the methanol storage tank, it is adapted to the location of the liquid collection well, and the spatial integration of methanol fuel ships is improved.

[0042] By placing external pumps close to the hull of methanol-fueled vessels, the risk of mechanical damage is reduced by avoiding the impact of waves on the sides.

[0043] By placing an external pump near the stern of a methanol-fueled vessel, which is adapted to a situation where the vessel is mostly stern-trimmed and partially bow-trimmed during a pitching cycle, the length of the methanol delivery pipeline is shortened.

[0044] The positive and progressive effects of this invention are as follows:

[0045] In this technical solution, by providing a methanol-fueled vessel, the high cost of traditional internal pumps is solved by utilizing an external pump design, and multiple compartments can share an external pump. Simultaneously, a collection well is installed. When the methanol storage tank experiences drastic level changes due to pitching and rolling in rough sea conditions, the methanol liquid in the collection well acts as a level buffer. Even under low liquid levels or severe rolling conditions, the liquid can still smoothly enter the collection well, preventing cavitation or cavitation in the external pump, ensuring continuous and stable operation of the methanol transportation process, and improving the reliability of the methanol-fueled vessel during operation. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the longitudinal section structure of the methanol-fueled ship of the present invention.

[0047] Figure 2 This is a schematic cross-sectional view of the methanol-fueled ship of the present invention.

[0048] Figure 3 This is a schematic diagram showing the location of the external pump of the present invention.

[0049] Figure 4 This is a schematic diagram of the cross-sectional structure of the liquid collection well of the present invention (I).

[0050] Figure 5 This is a top view of the liquid collection well of the present invention (I).

[0051] Figure 6 This is a top view of the liquid collection well of the present invention (II).

[0052] Figure 7 This is a schematic diagram of the longitudinal section structure of the liquid collection well of the present invention.

[0053] Figure 8 This is a top view of the manhole cover structure of the present invention.

[0054] Figure 9 This is a schematic diagram of the installation of the manhole cover according to the present invention.

[0055] Figure 10 This is a cross-sectional structural diagram of the manhole cover of the present invention.

[0056] Figure 11 This is a schematic diagram of the filter plate of the present invention.

[0057] Explanation of reference numerals in the attached figures:

[0058] Methanol storage tank 1

[0059] External Pump 21

[0060] Methanol delivery pipe 221

[0061] Buffer tube 222

[0062] Collection Well 3

[0063] Liquid collection inlet 31

[0064] manhole cover 32

[0065] First liquid collection hole 321

[0066] Filter plate 33

[0067] First ear plate 34

[0068] Second ear plate 35

[0069] Infusion buffer 4

[0070] Cofferdam 41

[0071] Second volume, liquid hole 42

[0072] 51 refill tube

[0073] Straight pipe 511

[0074] Inclined tube 512

[0075] Float switch 52

[0076] Longitudinal support structure 61

[0077] Horizontal support structure 62

[0078] Low-level alarm device 71

[0079] Low-low level alarm device 72

[0080] Pump shutdown device 73

[0081] Deck 8 Detailed Implementation

[0082] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0083] like Figures 1-11 As shown, this embodiment provides a methanol-fueled ship, which includes a methanol storage tank 1 and a methanol delivery system for delivering methanol in the methanol storage tank 1; the methanol delivery system includes an external pump 21, a collection well 3 and a methanol delivery pipe 221.

[0084] The collecting well 3 is located below the methanol storage tank 1. The top of the collecting well 3 is provided with a collecting inlet 31, which is connected to the bottom of the methanol storage tank 1. One end of the methanol delivery pipe 221 is connected to the bottom of the collecting well 3, and the other end of the methanol delivery pipe 221 is connected to the external pump 21.

[0085] This design of the external pump 21 solves the problem of high cost associated with traditional internal pumps and enables multiple compartments to share the external pump 21. Simultaneously, the inclusion of a collection well 3 allows for level buffering of methanol in the methanol storage tank 1 during rough sea conditions caused by pitching and rolling. Even under low levels or violent shaking, the methanol can still smoothly enter the collection well 3, preventing cavitation or suction problems in the external pump 21 and ensuring continuous and stable operation of the methanol transport process, thus improving the reliability of the methanol-fueled vessel.

[0086] In this embodiment, the external pump 21 is arranged in the deck 8 area between the storage tank and the fuel preparation room, and can be horizontal or vertical. To reduce the space occupied by the external pump 21 and its pipelines, valves, and accessories on the deck 8, the external pump 21 and its associated pipelines are arranged on the deck 8 below the storage tank, which does not occupy the deck 8 space outside the storage tank. To achieve better protection against sea waves and rain, the storage tank support structure around the external pump 21 can be in the form of a plate frame.

[0087] In this embodiment, the two external pumps 21 are configured with one in use and one on standby.

[0088] In this embodiment, the collection well 3 is a square well. In other embodiments, different forms of collection well 3, such as square wells or round wells, can be selected depending on the ship's conditions.

[0089] In this embodiment, the methanol delivery system also includes a well cover 32, the top of which is provided with a first liquid collection hole 321, and the well cover 32 covers the liquid collection inlet 31. The well cover 32 effectively prevents impurities from entering the liquid collection well 3, while reducing liquid sloshing and overflow, ensuring the stability of the liquid level in the liquid collection well 3 and the maximum amount of liquid retained in the well.

[0090] In this embodiment, the manhole cover 32 adopts an embedded design to ensure that the liquid smoothly enters the liquid collection inlet 31 without being affected by the height difference between the manhole cover 32 and the liquid collection inlet 31, and to reduce liquid overflow.

[0091] In this embodiment, the manhole cover 32 is fixed by the first ear plate 34, which makes the disassembly and maintenance of the manhole cover 32 more convenient and improves the operating efficiency.

[0092] In this embodiment, the first collection hole 321 is located on the side of the manhole cover 32 near the stern of the methanol-fueled vessel. Since the vessel spends most of its time stern-coasting and a small portion of its time bow-coasting during a pitching cycle, the first collection hole 321 on the manhole cover 32 is located near the stern. This allows methanol to enter the collection well 3 more easily when the vessel is stern-coasting, reducing liquid residue. At the same time, it prevents liquid from overflowing from the bow when the vessel is bow-coasting, further ensuring the effectiveness of the collection well 3 in buffering the liquid level.

[0093] In this embodiment, when the ship pitches under adverse sea conditions, as the ship changes from a stern-trimmed or level state to a bow-trimmed state, the forward flow of liquid cannot replenish the collection well 3. Upon returning to a level or stern-trimmed state, liquid replenishment to the collection well 3 can resume. Therefore, the volume of the collection well 3 needs to ensure that, within one ship pitching cycle, after supplying the maximum amount of liquid that the in-tank pumps can transport, the methanol level in the collection well 3 remains above a preset low level to guarantee safety redundancy. The specific value can be determined based on relevant calculations in the prior art.

[0094] In this embodiment, the methanol delivery system also includes a replenishment buffer zone 4, which is located at the bottom of the methanol storage tank 1 and at least partially at the top of the collection well 3. A dike 41 is provided around the perimeter of the replenishment buffer zone 4. A second collection hole 42 is provided at the top portion of the replenishment buffer zone 4 in the collection well 3. In the event of liquid surge caused by pitching, the replenishment buffer zone 4 can retain some liquid inside the dike 41, which then enters the collection well 3 through the second collection hole 42, effectively slowing down the rate of liquid level decline in the collection well 3 and ensuring the continuous operation of the external pump 21.

[0095] In this embodiment, the methanol delivery system also includes a replenishment pipe 51, a float switch 52, and a control unit; the replenishment pipe 51 is located inside the collection well 3, and the top end of the replenishment pipe 51 is connected to the second collection hole 42, and the bottom end of the replenishment pipe 51 is lower than the preset low level of the liquid level in the collection well 3; the float switch 52 is located inside the replenishment pipe 51 and is electrically connected to the control unit.

[0096] When the liquid level in the collection well 3 rises to the preset high level, the float switch 52 floats up and sends a closing signal to the control unit to close the replenishment pipe 51;

[0097] When the liquid level in the collection well 3 drops to the preset low level, the float switch 52 sinks and sends an opening signal to the control unit to open the replenishment pipe 51.

[0098] This allows the replenishment pipe 51 to automatically adjust its state based on changes in the liquid level within the collection well 3, ensuring a stable liquid level in the collection well 3, preventing the external pump 21 from drawing in air or causing cavitation, and simultaneously improving liquid utilization efficiency.

[0099] In this embodiment, to further prevent the external pump 21 from sucking in air or causing cavitation, a low-level alarm device 71 and a low-low-level alarm device 72 are installed in the liquid collection well 3 from top to bottom, and a pump stop device 73 is installed at the buffer pipe 222 to stop the external pump 21 in a timely manner.

[0100] refer to Figure 7 In this embodiment, the replenishment pipe 51 includes a straight pipe 511 and an inclined pipe 512. The top ends of the straight pipe 511 and the inclined pipe 512 are respectively connected to two adjacent second collection holes 42. The bottom end of the inclined pipe 512 is connected to the middle of the straight pipe 511. The float switch 52 is located inside the straight pipe 511. By setting the straight pipe 511 and the inclined pipe 512 together, the float switch 52 can float vertically along the straight pipe 511, while making the structure of the replenishment pipe 51 simple and easy to manufacture. Of course, in other embodiments, the two adjacent second collection holes 42 can also be formed by symmetrical bends, but the increase in pipe bends will increase the manufacturing difficulty.

[0101] In this embodiment, the inclined tube 512 is connected to the second liquid collection hole 42 near the bow. The inclination angle α of the inclined tube 512 is greater than the maximum bow tilt angle of the methanol fuel ship, ensuring that the liquid in front of the liquid replenishment buffer 4 can still flow into the liquid collection well 3 when the maximum bow tilt occurs.

[0102] In this embodiment, the replenishment pipe 51 adopts a dual-inlet design to ensure that all the liquid in the replenishment buffer zone 4 can flow into the collection well 3 in either the tail tilt or the head tilt state.

[0103] In this embodiment, the replenishment pipe 51 is connected by a flange, which facilitates disassembly and maintenance.

[0104] In this embodiment, the methanol delivery system includes two replenishment buffer zones 4, which are distributed on both sides of the liquid collection inlet 31 along the lateral direction of the methanol fuel ship. This is to maintain a balanced distribution of liquid when the ship rolls, and at the same time, to facilitate the direct flow of residual liquid into the liquid collection inlet 31 between the two replenishment buffer zones 4 when the ship pitches, thereby further improving the liquid collection efficiency of the liquid collection well 3 and reducing liquid waste under pitching conditions.

[0105] In this embodiment, in the transverse direction of the methanol fuel ship, the liquid collection well 3 is located near the middle of the methanol storage tank 1, which facilitates the flow of residual liquid from all directions in the methanol storage tank 1 into the liquid collection well 3, thereby further improving the liquid collection efficiency of the liquid collection well 3.

[0106] In this embodiment, the liquid collection well 3 is located close to the stern of the methanol-fueled ship in the longitudinal direction, which is suitable for the situation where the ship is stern-heeled for most of the time and bow-heeled for a small part of the time during a pitching cycle, thereby further improving the liquid collection efficiency of the liquid collection well 3.

[0107] In this embodiment, the bottom of the collection well 3 is inclined towards the center, which facilitates the flow of residual liquid from all directions at the bottom of the collection well 3 into the methanol delivery pipe 221.

[0108] In this embodiment, a filter plate 33 is provided at the bottom of the liquid collection well 3 to filter out larger impurities and prevent them from entering the downstream methanol delivery pipe 221 and the external pump 21, thereby reducing equipment wear and blockage risks and improving the operational stability of methanol fuel ships.

[0109] In this embodiment, the periphery of the filter plate 33 is fixed by the second ear plate 35, making the disassembly and maintenance of the filter plate 33 more convenient and improving the operating efficiency.

[0110] In this embodiment, the methanol delivery system further includes a buffer pipe 222. The diameter of the buffer pipe 222 is larger than the diameter of the methanol delivery pipe 221 but smaller than the diameter of the collection well 3. One end of the buffer pipe 222 is connected to the bottom of the collection well 3, and the other end is connected to the methanol delivery pipe 221. The presence of the buffer pipe 222 can slow down the change in the liquid level cross-section. Since the diameter of the buffer pipe 222 is smaller than the diameter of the collection well 3, the degree of liquid level fluctuation within the buffer pipe 222 is less than that within the collection well 3, further improving liquid level stability, preventing pump cavitation, reducing residual liquid during tank cleaning, and improving liquid utilization.

[0111] In this embodiment, the external pump 21 is located below the methanol storage tank 1, which is adapted to the position of the liquid collection well 3, and improves the spatial integration of the methanol fuel ship.

[0112] In this embodiment, the external pump 21 is positioned close to the ship's interior in the transverse direction of the methanol-fueled vessel to avoid impact from waves on the hull side and reduce the risk of mechanical damage.

[0113] In this embodiment, in the longitudinal direction of the methanol-fueled ship, the external pump 21 is located close to the stern of the methanol-fueled ship to accommodate the situation where the ship is stern-heeled for most of the time and bow-heeled for a small part of the time during a pitching cycle, thus shortening the length of the methanol delivery pipe 221.

[0114] In this embodiment, the methanol storage tank 1 is arranged in an open area above the deck 8. To improve safety redundancy, the methanol storage tank 1 does not use the deck 8 as its bottom structure, but is supported by hull components such as structural columns and structural plates, and rests on the deck 8.

[0115] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A methanol fuel vessel, comprising a methanol storage cabin and a methanol delivery system for delivering methanol in the methanol storage cabin; characterized in that: the methanol delivery system comprises an outboard pump, a sump and a methanol delivery pipe; the sump is located below the methanol storage cabin, and a top end of the sump is provided with a sump inlet connected to a bottom of the methanol storage cabin; one end of the methanol delivery pipe is connected to a bottom of the sump, and the other end of the methanol delivery pipe is connected to the outboard pump; the methanol delivery system further comprises a liquid supplement buffer zone, which is located at the bottom of the methanol storage cabin and at least partially at a top of the sump; a cofferdam is provided on a lateral side of the liquid supplement buffer zone; a second sump hole is provided in the part of the liquid supplement buffer zone at the top of the sump; the methanol delivery system further comprises a liquid supplement pipe, a float switch and a control unit; the liquid supplement pipe is located in the sump, and a top end of the liquid supplement pipe is connected to the second sump hole, and a bottom of the liquid supplement pipe is lower than a preset low level of a liquid level in the sump; the float switch is located in the liquid supplement pipe and is electrically connected to the control unit; when the liquid level in the sump rises to a preset high level, the float switch floats up and sends a closing signal to the control unit to close the liquid supplement pipe; when the liquid level in the sump falls to the preset low level, the float switch sinks down and sends an opening signal to the control unit to open the liquid supplement pipe; the liquid supplement pipe comprises a straight pipe and an inclined pipe, a top end of the straight pipe and a top end of the inclined pipe are respectively connected to two adjacent second sump holes, a bottom end of the inclined pipe is connected to a middle part of the straight pipe, and the float switch is located in the straight pipe.

2. The methanol fuelled marine vessel as claimed in claim 1, wherein, the methanol delivery system further comprises a well cover, a top of the well cover is provided with a first sump hole, and the well cover covers the sump inlet.

3. The methanol fuelled marine vessel as claimed in claim 2, wherein, the first sump hole is located on a side of the well cover close to a stern of the methanol fuel vessel.

4. The methanol fuelled marine vessel as claimed in claim 1, wherein, the methanol delivery system comprises two liquid supplement buffer zones, which are respectively distributed on two sides of the sump inlet along a transverse direction of the methanol fuel vessel.

5. The methanol fuelled marine vessel as claimed in claim 4, wherein, in the transverse direction of the methanol fuel vessel, the sump is located close to a middle part of the methanol fuel vessel; and / or, in a longitudinal direction of the methanol fuel vessel, the sump is located close to a stern of the methanol fuel vessel.

6. The methanol fuelled marine vessel as claimed in claim 4, wherein, a bottom of the sump is inclined towards a middle part; and / or, the bottom of the sump is provided with a filter hole plate; and / or, the methanol delivery system further comprises a buffer pipe, a diameter of the buffer pipe is greater than a diameter of the methanol delivery pipe and less than a diameter of the sump, one end of the buffer pipe is connected to a bottom of the sump, and the other end of the buffer pipe is connected to the methanol delivery pipe.

7. The methanol fuelled marine vessel as claimed in claim 1, wherein, the outboard pump is located below the methanol storage cabin; and / or, in the transverse direction of the methanol fuel vessel, the outboard pump is located close to a middle of the methanol fuel vessel; and / or, in the longitudinal direction of the methanol fuel vessel, the outboard pump is located close to the stern of the methanol fuel vessel; and / or, the methanol delivery system comprises two outboard pumps.

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