Methanol fuel ship

Abstract

The invention discloses a methanol fuel ship. The methanol fuel ship comprises a methanol storage cabin and a methanol conveying system for conveying methanol in the methanol storage cabin, the methanol conveying system comprises an outboard pump, a liquid collecting well and a methanol conveying pipe; the liquid collecting well is located below the methanol storage cabin, and a liquid collecting inlet is formed in the top end of the liquid collecting well and 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 outboard pump. According to the scheme, the problem that a traditional in-cabin pump is high in cost is solved, and an out-cabin pump is shared by multiple cabins. When the liquid level in the methanol storage cabin drastically changes due to pitching and rolling of a ship under severe sea conditions, methanol liquid in the liquid collecting well can achieve the liquid level buffering effect, the liquid can still smoothly enter the liquid collecting well under the working conditions of low liquid level or drastically shaking, air suction or cavitation of a pump outside the cabin is avoided, it is ensured that the methanol conveying process can continuously and stably run, and the service life of the methanol storage cabin is prolonged. And the reliability of the methanol fuel ship in operation is improved.

Description

Technical Field

[0001] The invention relates to the field of ship engineering, and in particular to a methanol fuel ship. Background Art

[0002] Due to the demand for carbon emission reduction, methanol is widely used in ships as a clean fuel. Methanol-fueled ships can be dual-fuel (i.e. powered by both marine fuel and methanol) or single-fuel (i.e. powered by methanol only). They all need to be equipped with an outboard pump to transport methanol from the methanol storage tank to the methanol daily system. In the prior art, an inboard pump (deep well pump or submersible pump) is generally used as an outboard pump. It is immersed below the liquid level of the methanol storage tank as a whole. Therefore, the inboard pumps between independent methanol compartments cannot or are difficult to serve as backup for each other, which results in each independent methanol compartment requiring at least one deep well pump or two submersible pumps; when there are more than two methanol storage tanks, the number of inboard pumps is too large, resulting in too high a total cost of the methanol delivery system; as for a single inboard pump, its cost is also high. At the same time, the inboard pump is difficult to maintain, the maintenance cycle is long and the cost is high. During maintenance, it will affect the operation of the entire system.

[0003] Therefore, setting up an outboard pump instead of an inboard pump to provide the power for transporting methanol can reduce the overall cost of the methanol transport system, facilitate inspections, reduce maintenance costs and difficulties, and reduce the impact range during maintenance. However, the outboard pump is easily affected by sea conditions: during the operation of the ship, especially in severe sea conditions, the pitch and roll of the hull will cause the liquid in the methanol storage tank to shake violently, which may cause problems such as suction and cavitation of the delivery pump, affecting the stable operation of the system; and the outboard pump is also prone to excessive residual liquid in the methanol storage tank, resulting in low fuel utilization. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a methanol fuel ship in order to overcome the defect in the prior art that an outboard pump is provided instead of an inboard pump to provide the power for transporting methanol, which is easily affected by the sea conditions on the operation.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A methanol fuel ship, comprising a methanol storage tank and a methanol delivery system for delivering the methanol in the methanol storage tank;

[0007] The methanol delivery system comprises an outboard pump, a liquid collection well and a methanol delivery pipe;

[0008] The liquid collecting well is located below the methanol storage tank, and a liquid collecting inlet is provided at the top of the liquid collecting well, and the liquid collecting inlet 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 liquid collecting well, and the other end of the methanol delivery pipe is connected to the outboard pump.

[0010] In this technical solution, by providing the methanol fuel ship, the design of the outboard pump solves the problem of high cost of the traditional inboard pump, and realizes the sharing of the outboard pump by multiple cabins. At the same time, a liquid collecting well is set. When the pitch and roll of the ship in severe sea conditions cause the liquid level in the methanol storage tank to change drastically, the methanol liquid in the liquid collecting well can achieve the effect of liquid level buffering. The liquid can still smoothly enter the liquid collecting well under low liquid level or severe shaking conditions, avoiding the outboard pump from sucking air or cavitation, ensuring that the methanol transportation process can continue to operate stably, and improving the reliability of the operation of the methanol fuel ship.

[0011] Preferably, the methanol delivery system further comprises a manhole cover, a top of the manhole cover is provided with a first liquid collecting hole, and the manhole cover is covered at the liquid collecting inlet.

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

[0013] Preferably, the first liquid collecting hole is located on a side of the manhole cover close to the tail of the methanol-fueled ship.

[0014] In the present technical solution, since the ship is in stern trim most of the time and bow trim for a small part of the time during a pitch cycle, the first liquid collecting hole on the manhole cover is arranged on the side close to the stern, so that methanol can more easily enter the liquid collecting well when the ship is in stern trim, reducing liquid residue and avoiding liquid overflow from the bow when the ship is in bow trim, thereby further ensuring the effect of the liquid collecting well in liquid level buffering.

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

[0016] A cofferdam is provided around the fluid replenishment buffer zone;

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

[0018] In this technical solution, by setting up a liquid replenishment buffer zone, when the pitch causes liquid surge, part of the liquid can be retained inside the cofferdam and then enter the liquid collecting well through the second liquid collecting hole, effectively slowing down the rate of drop of the liquid level in the liquid collecting well and ensuring the continuous operation of the outboard pump.

[0019] Preferably, the methanol delivery system further comprises a liquid replenishing pipe, a float switch and a control unit;

[0020] The liquid replenishing pipe is located in the liquid collecting well, and the top end of the liquid replenishing pipe is connected to the second liquid collecting hole, and the bottom end of the liquid replenishing pipe is lower than the preset low level of the liquid level in the liquid collecting well;

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

[0022] When the liquid level in the liquid collecting well rises to a preset high level, the float switch floats up and sends an opening signal to the control unit to open the liquid replenishing pipe;

[0023] When the liquid level in the liquid collecting well drops to the preset low level, the float switch floats up and sends a closing signal to the control unit to close the liquid replenishing pipe.

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

[0025] Preferably, the fluid infusion 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 collecting 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 the technical solution, by arranging the cooperation of the straight tube and the inclined tube, the float switch can float vertically along the straight tube, and at the same time the structure of the liquid infusion tube is simple and easy to manufacture.

[0027] Preferably, the methanol delivery system comprises two liquid replenishment buffers, which are respectively distributed on both sides of the liquid collection inlet along the lateral direction of the methanol fuel ship.

[0028] In the present technical solution, through the above arrangement, the balanced distribution of the liquid can be maintained when the ship rolls, and at the same time, when the ship pitches, the residual liquid can flow directly into the liquid collection inlet through the two liquid replenishment buffer zones, thereby further improving the liquid collection efficiency of the liquid collection well and reducing the waste of liquid under pitching conditions.

[0029] Preferably, in the transverse direction of the methanol fuel ship, the liquid collecting well is arranged near the middle of the methanol storage tank; and / or,

[0030] In the longitudinal direction of the methanol-fueled ship, the liquid collecting well is arranged close to the stern of the methanol-fueled ship.

[0031] In this technical solution, by arranging the liquid collection well near the middle of the methanol storage tank, it is convenient for residual liquid in all directions in the methanol storage tank to converge into the liquid collection well, further improving the liquid collection efficiency of the liquid collection well. By arranging the liquid collection well near the stern of the methanol fuel ship, it is adapted to the situation that the ship is in the stern trim for most of the time in a pitch cycle and in the bow trim for a small part of the time, further improving the liquid collection efficiency of the liquid collection well.

[0032] Preferably, the bottom of the liquid collecting well is inclined toward the middle; and / or,

[0033] A filter plate is provided at the bottom of the liquid collecting well; and / or,

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

[0035] In the present technical solution, by setting the bottom of the liquid collecting well to be inclined toward the middle, it is possible to facilitate the residual liquid in all directions at the bottom of the liquid collecting well to flow into the methanol delivery pipe.

[0036] By setting up a filter plate, larger impurities can be filtered out to prevent them from entering the downstream methanol delivery pipe and outboard pump, thereby reducing equipment wear and blockage risks and improving the operating stability of methanol-fueled ships.

[0037] By setting up a buffer tube, the change of the liquid surface cross-section is slowed down, and the diameter of the buffer tube is smaller than the diameter of the liquid collecting well, so that the fluctuation of the liquid surface in the buffer tube is smaller than that in the liquid collecting well, further improving the liquid level stability, avoiding the phenomenon of empty suction by the external pump, and reducing the residual liquid amount during tank cleaning, thereby improving the liquid utilization rate.

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

[0039] In the transverse direction of the methanol fuel ship, the outboard pump is arranged close to the midship of the methanol fuel ship; and / or,

[0040] In the longitudinal direction of the methanol-fueled ship, the outboard pump is disposed close to the stern of the methanol-fueled ship.

[0041] In the present technical solution, an outboard pump is arranged below the methanol storage tank, which is adapted to the position of the liquid collecting well and improves the spatial integration of the methanol fuel ship.

[0042] By locating the outboard pump close to the midship of the methanol fuel vessel, the impact of waves on the side is avoided and the risk of mechanical damage is reduced.

[0043] By arranging the outboard pump close to the stern of the methanol fuel ship, the length of the methanol delivery pipe is shortened to adapt to the situation in which the ship is in a stern trim for most of the time and in a bow trim for a small part of the time during a pitch cycle.

[0044] The positive and progressive effects of the present invention are:

[0045] In this technical solution, by providing the methanol fuel ship, the design of the outboard pump solves the problem of high cost of the traditional inboard pump, and realizes the sharing of the outboard pump by multiple cabins. At the same time, a liquid collecting well is set. When the pitch and roll of the ship in severe sea conditions cause the liquid level in the methanol storage tank to change drastically, the methanol liquid in the liquid collecting well can achieve the effect of liquid level buffering. The liquid can still smoothly enter the liquid collecting well under low liquid level or severe shaking conditions, avoiding the outboard pump from sucking air or cavitation, ensuring that the methanol transportation process can continue to operate stably, and improving the reliability of the operation of the methanol fuel ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the longitudinal section structure of the methanol fuel ship of the present invention.

[0047] Figure 2 It is a schematic diagram of the cross-sectional structure of the methanol fuel ship of the present invention.

[0048] Figure 3 It is a schematic diagram of the position of the outboard pump of the present invention.

[0049] Figure 4 Schematic diagram of the cross-sectional structure of the liquid collecting well of the present invention (I).

[0050] Figure 5 Schematic diagram of the top view of the liquid collecting well of the present invention (I).

[0051] Figure 6 Schematic diagram of the top view of the liquid collecting well of the present invention (II).

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

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

[0054] Fig. 9 It is a schematic diagram of the installation of the manhole cover of the present invention.

[0055] Fig.10 It is a schematic diagram of the cross-sectional structure of the manhole cover of the present invention.

[0056] Fig.11 It is a schematic structural diagram of the filter plate of the present invention.

[0057] Description of reference numerals:

[0058] Methanol storage tank 1

[0059] Overboard pump 21

[0060] Methanol delivery pipe 221

[0061] Buffer tube 222

[0062] Liquid collection well 3

[0063] Liquid collection inlet 31

[0064] Manhole cover 32

[0065] The first liquid collecting hole 321

[0066] Filter plate 33

[0067] First ear plate 34

[0068] Second ear plate 35

[0069] Rehydration Buffer 4

[0070] Cofferdam 41

[0071] The second liquid collecting hole 42

[0072] Fluid infusion tube 51

[0073] Straight pipe 511

[0074] Inclined tube 512

[0075] Float switch 52

[0076] Longitudinal support structure 61

[0077] Lateral support structure 62

[0078] Low level alarm device 71

[0079] Low level alarm device 72

[0080] Pump stop device 73

[0081] Deck 8 DETAILED DESCRIPTION

[0082] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0083] like Figure 1-Figure 11 As shown, this embodiment provides a methanol fuel 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 outboard pump 21, a liquid collecting well 3 and a methanol delivery pipe 221.

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

[0085] In this way, the design of the outboard pump 21 can solve the problem of high cost of the traditional inboard pump, and realize the sharing of the outboard pump 21 by multiple cabins. At the same time, the liquid collecting well 3 is set. When the liquid level in the methanol storage tank 1 changes drastically due to the pitching and rolling of the ship in severe sea conditions, the methanol liquid in the liquid collecting well 3 can achieve the effect of liquid level buffering. The liquid can still smoothly enter the liquid collecting well 3 under low liquid level or severe shaking conditions, avoiding the outboard pump 21 from sucking air or cavitation, ensuring that the methanol transportation process can continue to operate stably, and improving the reliability of the operation of the methanol fuel ship.

[0086] In this embodiment, the outboard pump 21 is arranged in the deck 8 area between the storage tank and the fuel preparation room, either horizontally or vertically. In order to reduce the space occupied by the outboard pump 21 and its pipelines, valve accessories, etc. on the deck 8, the outboard pump 21 and its associated pipelines are arranged on the deck 8 below the storage tank, and the deck 8 space outside the storage tank can be not occupied. In order to achieve better shielding and protection against waves and open rain, the storage tank support structure around the outboard pump 21 can be in the form of a plate frame.

[0087] In this embodiment, two outboard pumps 21 are arranged as one for use and one for standby.

[0088] In this embodiment, the liquid collecting well 3 is a square well. In other embodiments, different liquid collecting well 3 forms such as a square well or a round well can be selected according to the conditions of the ship.

[0089] In this embodiment, the methanol delivery system further includes a manhole cover 32, a first liquid collecting hole 321 is provided on the top of the manhole cover 32, and the manhole cover 32 is provided on the liquid collecting inlet 31. The setting of the manhole cover 32 effectively prevents impurities from entering the liquid collecting well 3, and at the same time reduces liquid sloshing and overflow, thereby ensuring the stability of the liquid level in the liquid collecting well 3 and the maximum retention amount of the liquid 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 liquid collecting hole 321 is located on the side of the manhole cover 32 close to the stern of the methanol fuel ship. Since the ship is in the stern trim most of the time and in the bow trim for a small part of the time during a pitching cycle, the first liquid collecting hole 321 on the manhole cover 32 is arranged on the side close to the stern, so that methanol can more easily enter the liquid collecting well 3 when the ship is in the stern trim state, reducing liquid residue and avoiding liquid overflow from the bow in the bow trim state, further ensuring the effect of the liquid collecting well 3 in liquid level buffering.

[0093] In this embodiment, when the ship pitches under severe sea conditions, the ship turns from a stern or horizontal state to a bow tilt state, and the liquid surge cannot replenish the liquid collecting well 3. When the ship returns to a horizontal or stern tilt state, the liquid collecting well 3 can continue to be replenished. Therefore, the volume of the liquid collecting well 3 needs to meet the requirement that the amount of methanol in the liquid collecting well 3 is still above the preset low level after supplying the maximum amount of liquid that can be transferred by the pump in the cabin within a ship pitching cycle, so as to ensure safety redundancy, and the specific value can be determined according to relevant calculations in the prior art.

[0094] In this embodiment, the methanol delivery system further includes a liquid replenishment buffer 4, which is located at the bottom of the methanol storage tank 1 and at least partially located at the top of the liquid collecting well 3; a cofferdam 41 is provided around the liquid replenishment buffer 4; and a second liquid collecting hole 42 is provided at the part of the liquid replenishment buffer 4 located at the top of the liquid collecting well 3. When the liquid surges due to pitching, the liquid replenishment buffer 4 can retain part of the liquid inside the cofferdam 41, and then enter the liquid collecting well 3 through the second liquid collecting hole 42, effectively delaying the rate of liquid level drop in the liquid collecting well 3 and ensuring the continuous operation of the outboard pump 21.

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

[0096] When the liquid level in the liquid collecting well 3 rises to a preset high level, the float switch 52 floats up and sends an opening signal to the control unit to open the liquid replenishing pipe 51;

[0097] When the liquid level in the liquid collecting well 3 drops to a preset low level, the float switch 52 floats up and sends a closing signal to the control unit to close the liquid replenishing tube 51 .

[0098] In this way, the state of the liquid replenishing pipe 51 can be automatically adjusted according to the change of the liquid level in the liquid collecting well 3, so as to ensure the stability of the liquid level in the liquid collecting well 3, avoid the outboard pump 21 from sucking air or generating cavitation, and improve the liquid utilization efficiency.

[0099] In this embodiment, in order to further prevent the outboard pump 21 from being emptied or producing cavitation, a low-level alarm device 71 and a low-low-level alarm device 72 are arranged in the liquid collecting well 3 from top to bottom, and a pump stop device 73 is arranged at the buffer pipe 222 to stop the outboard pump 21 in time.

[0100] refer to Figure 7 In this embodiment, the infusion tube 51 includes a straight tube 511 and an oblique tube 512. The top of the straight tube 511 and the top of the oblique tube 512 are respectively connected to two adjacent second liquid collecting holes 42. The bottom of the oblique tube 512 is connected to the middle of the straight tube 511. The float switch 52 is located inside the straight tube 511. By arranging the straight tube 511 and the oblique tube 512 to cooperate, it is convenient for the float switch 52 to float vertically along the straight tube 511, and at the same time, the structure of the infusion tube 51 is simple and easy to manufacture. Of course, in other embodiments, the two adjacent second liquid collecting holes 42 can also be in the form of symmetrical elbows, etc., but the increase in pipe elbows will increase the difficulty of manufacturing.

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

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

[0103] In this embodiment, the liquid infusion tube 51 is connected by a flange, which is convenient for disassembly and maintenance.

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

[0105] In this embodiment, in the lateral direction of the methanol-fueled ship, the liquid collecting well 3 is arranged near the middle of the methanol storage tank 1, so as to facilitate the residual liquid in all directions in the methanol storage tank 1 to converge into the liquid collecting well 3, thereby further improving the liquid collection efficiency of the liquid collecting well 3.

[0106] In this embodiment, the liquid collection well 3 is arranged close to the stern of the methanol fuel ship in the longitudinal direction of the methanol fuel ship, which is adapted to the situation that the ship is in stern trim most of the time and bow trim for a small part of the time during a pitch cycle, thereby further improving the liquid collection efficiency of the liquid collection well 3.

[0107] In this embodiment, the bottom of the liquid collecting well 3 is inclined toward the middle, so as to facilitate the residual liquid in all directions at the bottom of the liquid collecting well 3 to flow into the methanol conveying pipe 221 .

[0108] In this embodiment, a filter plate 33 is provided at the bottom of the liquid collecting well 3 to filter larger impurities and prevent them from entering the downstream methanol delivery pipe 221 and the outboard pump 21, thereby reducing equipment wear and blockage risks and improving the operating stability of the methanol-fueled ship.

[0109] In this embodiment, the peripheral side of the filter plate 33 is fixed by the second ear plate 35, so that the removal and maintenance of the filter plate 33 are more convenient, thereby improving the operation efficiency.

[0110] In this embodiment, the methanol delivery system further includes a buffer tube 222, the diameter of which is larger than the diameter of the methanol delivery tube 221 and smaller than the diameter of the liquid collecting well 3, one end of the buffer tube 222 is connected to the bottom of the liquid collecting well 3, and the other end of the buffer tube 222 is connected to the methanol delivery tube 221. The existence of the buffer tube 222 can slow down the degree of change in the liquid surface cross section, and the diameter of the buffer tube 222 is smaller than the diameter of the liquid collecting well 3, so that the degree of fluctuation of the liquid surface in the buffer tube 222 is smaller than that in the liquid collecting well 3, further improving the stability of the liquid level, avoiding the phenomenon of pump suction, and reducing the amount of residual liquid during tank cleaning, thereby improving the utilization rate of liquid.

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

[0112] In this embodiment, in the transverse direction of the methanol fuel ship, the outboard pump 21 is arranged close to the midship of the methanol fuel ship to avoid the impact of waves on the side and reduce the risk of mechanical damage.

[0113] In this embodiment, in the longitudinal direction of the methanol fuel ship, the outboard pump 21 is arranged close to the stern of the methanol fuel ship to adapt to the situation that the ship is in a stern trim for most of the time and in a bow trim for a small part of the time during a pitch cycle, thereby 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. In order to improve safety redundancy, the methanol storage tank 1 does not use the deck 8 as the bottom structure, but is supported by hull components such as structural columns and structural plates and falls above the deck 8.

[0115] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A methanol fuel ship, comprising a methanol storage tank and a methanol delivery system for delivering the methanol in the methanol storage tank; characterized in that: The methanol delivery system comprises an outboard pump, a liquid collection well and a methanol delivery pipe; The liquid collecting well is located below the methanol storage tank, and a liquid collecting inlet is provided at the top of the liquid collecting well, and the liquid collecting inlet is connected to the bottom of the methanol storage tank; 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 outboard pump.

2. The methanol fuel ship according to claim 1, characterized in that: The methanol delivery system further comprises a manhole cover, a first liquid collecting hole is arranged on the top of the manhole cover, and the manhole cover is covered at the liquid collecting inlet.

3. The methanol fuel ship according to claim 2, characterized in that: The first liquid collecting hole is located on one side of the manhole cover close to the tail of the methanol fuel ship.

4. The methanol fuel ship according to claim 1, characterized in that: The methanol delivery system further includes a liquid replenishment buffer, which is located at the bottom of the methanol storage tank and at least partially located at the top of the liquid collection well; A cofferdam is provided around the fluid replenishment buffer zone; A portion of the liquid replenishment buffer area located at the top of the liquid collection well is provided with a second liquid collection hole.

5. The methanol fuel ship according to claim 4, characterized in that: The methanol delivery system also includes a liquid replenishing pipe, a float switch and a control unit; The liquid replenishing pipe is located in the liquid collecting well, and the top end of the liquid replenishing pipe is connected to the second liquid collecting hole, and the bottom end of the liquid replenishing pipe is lower than the preset low level of the liquid level in the liquid collecting well; The float switch is located inside the liquid infusion tube and is electrically connected to the control unit; When the liquid level in the liquid collecting well rises to a preset high level, the float switch floats up and sends an opening signal to the control unit to open the liquid replenishing pipe; When the liquid level in the liquid collecting well drops to the preset low level, the float switch floats up and sends a closing signal to the control unit to close the liquid replenishing pipe.

6. The methanol fuel ship according to claim 5, characterized in that: The liquid infusion tube includes a straight tube and an inclined tube, the top of the straight tube and the top of the inclined tube are respectively connected to two adjacent second liquid collecting holes, the bottom of the inclined tube is connected to the middle of the straight tube, and the float switch is located inside the straight tube.

7. The methanol fuel ship according to claim 4, characterized in that: The methanol transportation system comprises two liquid replenishment buffers, which are respectively distributed on both sides of the liquid collection inlet along the lateral direction of the methanol fuel ship.

8. The methanol fuel ship according to claim 7, characterized in that: In the transverse direction of the methanol fuel ship, the liquid collecting well is arranged near the middle of the methanol storage tank; and / or, In the longitudinal direction of the methanol-fueled ship, the liquid collecting well is arranged close to the stern of the methanol-fueled ship.

9. The methanol fuel ship according to claim 7, characterized in that: The bottom of the liquid collecting well is inclined toward the middle; and / or, A filter plate is provided at the bottom of the liquid collecting well; and / or, The methanol delivery system also includes a buffer tube, the diameter of which is larger than the diameter of the methanol delivery tube and smaller than the diameter of the liquid collecting well, one end of the buffer tube is connected to the bottom of the liquid collecting well, and the other end of the buffer tube is connected to the methanol delivery tube.

10. The methanol fuel ship according to claim 1, characterized in that: The overboard pump is located below the methanol storage tank; and / or, In the transverse direction of the methanol fuel ship, the outboard pump is arranged close to the midship of the methanol fuel ship; and / or, In the longitudinal direction of the methanol-fueled ship, the outboard pump is arranged close to the stern of the methanol-fueled ship; and / or, The methanol delivery system includes two outboard pumps.

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