Methanol fuel double-wall pipe outer space liquid phase filling system

Abstract

The invention relates to the technical field of ship manufacturing, and particularly discloses a methanol fuel double-wall pipe outer space liquid phase filling system which is used for being connected with a methanol fuel supply system and comprises a fresh water circulating water tank, a water outlet pipeline, a water return pipeline, a circulating pump and a methanol discharge cabin. The water outlet pipeline is connected with the fresh water circulating water cabinet and the outer space of the double-wall pipe, the water return pipeline is connected with the fresh water circulating water cabinet and the outer space of the double-wall pipe, the fresh water circulating water cabinet, the water outlet pipeline and the water return pipeline jointly form a circulating loop, the water return pipeline is provided with an electric three-way valve, and the circulating pump is arranged on the water outlet pipeline or the water return pipeline. A first discharge pipeline is connected between the methanol discharge cabin and the electric three-way valve; wherein the working pressure in the outer space of the double-wall pipe is smaller than the pressure of a methanol fuel supply system. According to the invention, when the inner pipe of the double-wall pipe is damaged, leaked methanol fuel can be dissolved in circulating fresh water, so that the safety and reliability of a methanol fuel supply system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly to a liquid-phase filling system for the outer space of a double-wall pipe of a methanol fuel. Background Art

[0002] With the increasingly strict environmental protection regulations, the International Maritime Organization (IMO) has continuously strengthened the restrictions on greenhouse gas emissions, sulfur oxides (SOx), nitrogen oxides (NOx) and other pollutant emissions of ships. Traditional marine fuels, such as heavy fuel oil, will produce a large amount of pollutants after combustion, while methanol fuel contains no sulfur and has relatively low nitrogen oxide emissions, which can meet the IMO's limit requirements for sulfur emissions and partial nitrogen emissions, and meet the requirements of environmental protection regulations and the needs of energy transformation.

[0003] Due to the global attention to clean energy and the concern about the sustainability of fossil energy, the shipping industry, as an important field of energy consumption and pollutant emissions, needs to find sustainable alternative fuels. Methanol has the advantages of good combustion performance, good anti-knock performance, convenient storage and transportation (compared with alternative fuels such as LNG and hydrogen), and moreover, methanol can use green methanol produced from renewable energy, which has good sustainability and conforms to the development direction of energy transformation. Furthermore, with the successful development and rapid application of marine methanol fuel engines, the methanol fuel supply system will be an important system for methanol fuel ships.

[0004] However, methanol fuel still has the following defects as a ship alternative fuel:

[0005] 1. Toxicity risk of methanol: Methanol is toxic and poses a potential threat to the health of crew members. During the storage, filling and use of methanol, if leakage or accident occurs, it may cause poisoning of personnel;

[0006] 2. Fire and explosion risks: Methanol is a low flash point fuel with high flammability. Although its vapor pressure is smaller than that of gasoline, there are still fire and explosion risks during storage and use;

[0007] 3. Methanol has strong volatility (compared with diesel), and the boiling point of methanol is relatively low (64.7 °C at normal pressure). The smell of methanol can be clearly smelled beside an open methanol container.

[0008] Most of the methanol fuel supply pipelines of existing marine methanol fuel engines adopt double-wall pipes, and mechanical negative pressure ventilation equipment (with a ventilation capacity of at least 30 air changes per hour) is set in the space between the fuel pipeline and the outer pipe or the pipe wall to overcome the above existing defects. However, when the inner pipe of the double-wall pipe is damaged, the methanol fuel is discharged to the atmospheric environment with the ventilation, causing pollution and potential risks to the environment and the personnel on board, and having low safety and reliability. Summary of the Invention

[0009] The technical problem to be solved by the present invention is: how to improve the safety and reliability of a methanol fuel supply system.

[0010] To solve the above technical problem, the present invention provides a liquid-phase filling system for the outer space of a double-wall pipe of methanol fuel, which is used to connect with a methanol fuel supply system, and includes:

[0011] A fresh water circulating water tank;

[0012] An outlet water pipe, which connects the fresh water circulating water tank and the outer space of the double-wall pipe;

[0013] A return water pipe, which connects the fresh water circulating water tank and the outer space of the double-wall pipe. The fresh water circulating water tank, the outlet water pipe and the return water pipe jointly form a circulation loop, and an electric three-way valve is provided on the return water pipe;

[0014] A circulating pump, which is arranged on the outlet water pipe or the return water pipe; and,

[0015] A methanol discharge tank, and a first discharge pipe is connected between the methanol discharge tank and the electric three-way valve;

[0016] Wherein, the working pressure in the outer space of the double-wall pipe is less than the pressure of the methanol fuel supply system.

[0017] Further preferably, it further includes:

[0018] A control box, and both the circulating pump and the electric three-way valve are controlled by the control box.

[0019] Further preferably, it further includes:

[0020] A first sampling sensor, which is connected to the outlet water pipe and is used to detect the methanol content in the circulating liquid in the outlet water pipe;

[0021] A second sampling sensor, which is connected to the return water pipe and is used to detect the methanol content in the circulating liquid in the return water pipe; and,

[0022] A sampling control module, both the first sampling sensor and the second sampling sensor are connected to the sampling control module, and the sampling control module is connected to the control box;

[0023] Among them, the sampling control module is configured to be able to obtain the methanol content values detected by the first sampling sensor and the second sampling sensor, compare the detected methanol content values with the set value, and if the detected methanol content exceeds the standard, be able to feedback the over-standard signal to the control box, and the control box controls the electric three-way valve to conduct the first discharge pipeline; if the detected methanol content does not exceed the standard, the return water pipeline is maintained in a conducting state.

[0024] Further preferably, the fresh water circulating water tank is further provided with a make-up water pipeline, the make-up water pipeline is configured to be connected to the ship's pressure water tank, the make-up water pipeline is provided with a make-up water electric valve, and the make-up water electric valve is controlled by the control box.

[0025] Further preferably, a high-level sensor and a low-level sensor are arranged inside the fresh water circulating water tank. The high-level sensor is configured to be able to feedback the high-level signal to the control box when the liquid in the fresh water circulating water tank reaches the specified high level, and control the make-up water electric valve to close through the control box; the low-level sensor is configured to be able to feedback the low-level signal to the control box when the liquid in the fresh water circulating water tank reaches the specified low level, and control the make-up water electric valve to open through the control box.

[0026] Further preferably, a circulating electric valve is arranged on the water outlet pipeline, and the circulating electric valve is controlled by the control box.

[0027] Further preferably, the fresh water circulating water tank is further provided with a control valve, the control valve is controlled by the control box, a second discharge pipeline is connected between the control valve and the methanol discharge tank, and the control valve is configured to be able to drain the liquid in the fresh water circulating water tank to the methanol discharge tank through the second discharge pipeline when it is opened.

[0028] Further preferably, it further includes:

[0029] A discharge pipeline, one end of the discharge pipeline is connected to the methanol discharge tank, and the other end of the discharge pipeline is provided with a shore connection joint, and the shore connection joint is configured to be able to connect the methanol discharge tank to the onshore collection tank.

[0030] Further preferably, a discharge pump is arranged on the discharge pipeline, and the discharge pump is controlled by the control box.

[0031] Further preferably, it further includes:

[0032] A first local button, the first local button is connected to the control box, and the first local button is configured to control the start and stop of the circulating pump; and,

[0033] A second local button, which is connected to the control box and configured to control the start and stop of the discharge pump.

[0034] Compared with the prior art, the beneficial effects of the methanol fuel double-wall pipe outer space liquid-phase filling system provided by the present invention are as follows:

[0035] The present invention can use a circulation pump to transport fresh water in a fresh water circulating tank to the outer space of the double-wall pipe through a water outlet pipeline and then reflow it back to the fresh water circulating tank through a water return pipeline, realizing the continuous recycling of fresh water resources. At the same time, the present application limits the working pressure in the outer space of the double-wall pipe to be less than the pressure of the methanol fuel supply system, which can ensure that when the inner pipe of the double-wall pipe is damaged, fresh water will not enter the inner pipe of the double-wall pipe, and the leaked methanol fuel can be dissolved in the circulating fresh water. When the methanol content in the fresh water reaches the set value, the fresh water in the circulation loop can be controlled by an electric three-way valve to be drained through a first discharge pipeline to a methanol discharge tank for storage, so as to facilitate subsequent treatment. Using the present invention can improve the safety and reliability of the methanol fuel supply system, minimize the potential threat of the toxicity risk of methanol to the health of crew members, and at the same time reduce the explosion risk caused by the strong volatility of methanol fuel, fully protecting the lives and property of crew members and avoiding pollution to the surrounding environment. Description of the Drawings

[0036] Figure 1 is the schematic diagram of a methanol fuel double-wall pipe outer space liquid-phase filling system according to the present invention.

[0037] Figure 2 is the circulation electrical diagram of a methanol fuel double-wall pipe outer space liquid-phase filling system according to the present invention.

[0038] Figure 3 is the discharge electrical diagram of a methanol fuel double-wall pipe outer space liquid-phase filling system according to the present invention.

[0039] Figure 4 is the schematic diagram of a methanol fuel double-wall pipe outer space liquid-phase filling system in another embodiment of the present invention.

[0040] Reference Signs:

[0041] 1. Freshwater circulating water tank; 2. Outlet pipeline; 3. Circulation pump; 4. Circulation electric valve; 5. Outer pipe of double-wall pipe; 6. Inner pipe of double-wall pipe; 7. Outer space of double-wall pipe; 8. Liquid inlet valve; 9. Return water pipeline; 10. Liquid outlet valve; 11. Electric three-way valve; 12. First sampling sensor; 13. Second sampling sensor; 14. High-level sensor; 15. Low-level sensor; 16. Make-up water pipeline; 17. Make-up water electric valve; 18. First discharge pipeline; 19. Methanol discharge tank; 20. Discharge pipeline; 21. Discharge pump; 22. Shore connection; 23. Control valve; 24. Second discharge pipeline; 25. Control box; 26. First local button; 27. Sampling control module; 28. Second local button; 29. Sampling alarm signal cable. Detailed implementation manners

[0042] The following combines the accompanying drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. in the present invention are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0044] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0048] As Figures 1 - 3 shown, this embodiment provides a liquid-phase filling system for the outer space of a methanol fuel double-wall pipe, which is used to connect with a methanol fuel supply system.

[0049] It should be noted that, please refer to Figure 1 , the ship includes an engine room (safe area) and a methanol fuel preparation room (hazardous area). There is a bulkhead isolation between the engine room and the methanol fuel preparation room. The methanol fuel supply system includes a methanol fuel engine and a double-wall pipe. The double-wall pipe penetrates through the bulkhead. The methanol fuel engine is arranged in the engine room. The double-wall pipe includes an outer double-wall pipe 5 and an inner double-wall pipe 6. The inner double-wall pipe 6 is connected to the methanol fuel engine, and the methanol fuel preparation room can transport methanol fuel to the methanol fuel engine through the inner double-wall pipe 6. The outer double-wall pipe 5 is sleeved on the outer periphery of the inner double-wall pipe 6 and forms a sealed outer space 7 of the double-wall pipe with the inner double-wall pipe 6. Since methanol is a polar molecule with hydrophilic groups and water is also a polar molecule, the hydrogen bond interaction between methanol and water enables them to be completely miscible. The main function of the liquid-phase filling system for the outer space of the methanol fuel double-wall pipe of the present invention is to circulate and transport fresh water to the outer space 7 of the double-wall pipe, so as to achieve water sealing, that is, the methanol fuel leaked through the inner double-wall pipe 6 can be miscible with the circulating fresh water, thereby improving the safety and reliability of the methanol fuel supply system.

[0050] In the specific implementation, as Figure 1As shown in the figure, the liquid-phase filling system for the outer space of the methanol fuel double-walled pipe of the present invention includes an outlet pipe 2 of the fresh water circulating water tank 1, a return pipe 9, a circulating pump 3, and a methanol discharge tank 19. Among them, the outlet pipe 2 is connected to the fresh water circulating water tank 1 and the outer space 6 of the double-walled pipe; the return pipe 9 is connected to the fresh water circulating water tank 1 and the outer space 6 of the double-walled pipe. The fresh water circulating water tank 1, the outlet pipe 2, and the return pipe 9 together form a circulation loop, and the return pipe 9 is provided with an electric three-way valve 11; the circulating pump 3 is arranged on the outlet pipe 2; a first discharge pipe 18 is connected between the methanol discharge tank 19 and the electric three-way valve 11. Among them, the working pressure in the outer space 7 of the double-walled pipe is less than the pressure of the methanol fuel supply system. In this embodiment, the circulating pump 3 can transport the fresh water in the fresh water circulating water tank 1 to the outer space 6 of the double-walled pipe through the outlet pipe 2 and re-flow back to the fresh water circulating water tank 1 through the return pipe 9, realizing the continuous recycling of fresh water resources. At the same time, in this application, it is specified that the working pressure in the outer space 7 of the double-walled pipe is less than the pressure of the methanol fuel supply system, which can ensure that when the inner pipe 6 of the double-walled pipe is damaged, fresh water will not enter the inner pipe 6 of the double-walled pipe, and the leaked methanol fuel can be dissolved in the circulating fresh water. When the methanol content in the fresh water reaches the set value, the fresh water in the circulation loop can be controlled by the electric three-way valve 11 to be drained to the methanol discharge tank 19 for storage through the first discharge pipe 18 for subsequent treatment. Using the present invention can improve the safety and reliability of the methanol fuel supply system, minimize the potential threat of the toxicity risk of methanol to the health of the crew, and at the same time reduce the explosion risk caused by the strong volatility of methanol fuel, fully protecting the lives and property of the crew and avoiding pollution to the surrounding environment.

[0051] In other embodiments, the circulating pump 3 can also be arranged on the return pipe 9, and its function is also to realize the circulation of fresh water in the circulation loop, as Figure 4 shown.

[0052] In some embodiments, the outer pipe 5 of the double-walled pipe is provided with an inlet and an outlet. The inlet is located on one side of the methanol fuel preparation room, and the inlet is provided with a liquid inlet valve 8. One end of the outlet pipe 2 is connected to the liquid inlet valve 8; the outlet is located on one side of the engine room, and the distance between the inlet and the outlet is as far as possible, so that after the fresh water enters the outer space 7 of the double-walled pipe, it can fill the entire outer space to ensure that the methanol leakage can be dissolved in the fresh water. A liquid outlet valve 10 is also provided on one side of the methanol fuel preparation room. The liquid outlet valve 10 is connected to the outlet pipe, and the return pipe 9 is connected to the liquid outlet valve 10; it should be noted that in order to avoid the leakage of circulating water from affecting the normal operation of the methanol fuel engine, the circulating pipe on the engine room side should adopt a fully welded mode to avoid detachable joints. Therefore, the liquid outlet valve 10 needs to be set on one side of the methanol fuel preparation room.

[0053] In the above embodiments, adding the liquid inlet valve 8 and the liquid outlet valve 10 enables replacement when the water outlet pipe 2 or the water return pipe 9 is damaged, without the need to disassemble the double-wall pipe, improving the convenience and operability of subsequent maintenance.

[0054] In some embodiments, the methanol fuel double-wall pipe outer space liquid phase filling system further includes a control box 25. The circulation pump 3 and the electric three-way valve 11 are both controlled by the control box 25, so as to realize the intelligent control of the circulation loop.

[0055] In some embodiments, the methanol fuel double-wall pipe outer space liquid phase filling system further includes a first sampling sensor 12, a second sampling sensor 13 and a sampling control module 27. Specifically, the first sampling sensor 12 is connected to the water outlet pipe 2 for detecting the methanol content of the circulating liquid in the water outlet pipe 2. The second sampling sensor 13 is connected to the water return pipe 9 for detecting the methanol content of the circulating liquid in the water return pipe 9. The first sampling sensor 12 and the second sampling sensor 13 are both connected to the sampling control module 27, and the sampling control module 27 is connected to the control box 25. Among them, the sampling control module 27 is configured to be able to obtain the methanol content values detected by the first sampling sensor 12 and the second sampling sensor 13, and compare the detected methanol content values with the set value. If the detected methanol content exceeds the standard, the sampling control module 27 can feedback the over-standard signal to the control box 25, and the control box 25 controls the electric three-way valve 11 to conduct the first discharge pipe 18. If the detected methanol content does not exceed the standard, the water return pipe 9 is kept conducting.

[0056] In some embodiments, an alarm unit is further included. The alarm unit is connected to the sampling control module 27. After the sampling control module 27 feeds back the methanol content over-standard signal to the control box 25, the control box 25 sends an alarm signal to the alarm unit through the sampling alarm signal cable 29, and the alarm unit emits an alarm sound or lights up.

[0057] In some embodiments, the fresh water circulating water tank 1 is further provided with a water replenishing pipe 16. The water replenishing pipe 16 is configured to be connected to the ship's pressure water tank for replenishing fresh water to the fresh water circulating water tank 1. The water replenishing pipe 16 is provided with a water replenishing electric valve 17, and the water replenishing electric valve 17 is controlled by the control box 25 to realize the intelligent control of the water replenishing electric valve 17.

[0058] In other embodiments, seawater can also be replenished to the fresh water circulating water tank 1 through the water replenishing pipe 16. However, since seawater is corrosive, anti-corrosion treatment needs to be carried out on the entire pipeline system, such as painting or applying anti-corrosion coatings.

[0059] In some embodiments, to further achieve automatic water replenishment for the fresh water circulation tank 1, a high-level sensor 14 and a low-level sensor 15 are provided inside the fresh water circulation tank 1. The high-level sensor 14 is configured to, when the liquid in the fresh water circulation tank 1 reaches the specified high level, feedback a high-level signal to the control box 25 and control the water replenishment electric valve 17 to close through the control box 25. The low-level sensor 15 is configured to, when the liquid in the fresh water circulation tank 1 reaches the specified low level, feedback a low-level signal to the control box 25 and control the water replenishment electric valve 17 to open through the control box 25, thereby achieving automatic control.

[0060] In some embodiments, a circulation electric valve 4 is provided in the water outlet pipeline 2 to control the conduction and blockage of the water outlet pipeline 2. The circulation electric valve 4 is controlled by the control box 25 to achieve intelligent control.

[0061] In some embodiments, when the methanol content in the circulating fresh water exceeds the standard, the first discharge pipeline 18 can be conducted through the electric three-way valve 11, so that the circulating fresh water is drained into the methanol discharge tank 19 for storage. To improve the replacement efficiency of the fresh water with excessive standards, a control valve 23 is further provided in the fresh water circulation tank 1. The control valve 23 is controlled by the control box 25. A second discharge pipeline 24 is connected between the control valve 23 and the methanol discharge tank 19. The control valve 23 is configured to, when opened, be able to drain the liquid in the fresh water circulation tank 1 through the second discharge pipeline 24 into the methanol discharge tank 19, that is, simultaneously conduct the second discharge pipeline 24 through the control valve 23. Cooperating with the first discharge pipeline 18, the circulating fresh water with excessive methanol content can be quickly drained into the methanol discharge tank 19 for storage, and then new fresh water resources are replenished into the fresh water circulation tank 1 through the water replenishment pipeline 16.

[0062] In some embodiments, the outer space liquid phase filling system of the methanol fuel double-walled pipe further includes a discharge pipeline 20. One end of the discharge pipeline 20 is connected to the methanol discharge tank 19, and a shore connection 22 is provided at the other end of the discharge pipeline 20. The shore connection 22 is configured to be able to connect the methanol discharge tank 19 with the onshore collection tank, so that after the ship docks, the fresh water with excessive methanol content can be barged to the shore for further treatment.

[0063] In some embodiments, a discharge pump 21 is provided in the discharge pipeline 20. The discharge pump 21 is controlled by the control box 25. The setting of the discharge pump 21 can improve the conveying efficiency of the fresh water with excessive methanol content and shorten the connection time.

[0064] In some embodiments, the liquid-phase filling system for the outer space of the methanol fuel double-wall pipe further includes a first local button 26 and a second local button 28; wherein, the first local button 26 is connected to the control box 25, and the first local button 26 is configured to control the start and stop of the circulation pump 3; the second local button 28 is connected to the control box 25, and the second local button 28 is configured to control the start and stop of the discharge pump 21, so as to facilitate timely control of risks in case of emergencies.

[0065] The working principle of the present invention is as follows: Please refer to Figures 1 - 3 , fresh water from the ship's pressure water tank enters the fresh water circulation tank 1 through the make-up water pipeline 16 and the make-up water electric valve 17. The circulation pump 3 extracts the fresh water in the fresh water circulation tank 1 and flows through the outlet pipeline 2, valve parts, the circulation electric valve 4, and the water inlet of the outer pipe 5 of the double-wall pipe, and then enters the outer space 7 of the double-wall pipe of the methanol fuel double-wall pipe. After the circulating fresh water fills the outer space 7 of the double-wall pipe, it then returns to the fresh water circulation tank 1 through the water outlet of the outer pipe 5 of the double-wall pipe, the return water pipeline 9, valve parts, and the electric three-way valve 11, and circulates in this way; when the methanol content values detected by the first sampling sensor 12 and the second sampling sensor 13 exceed the set value, the sampling control module 27 feeds back the over-standard signal to the control box 25, and the control box 25 controls the electric three-way valve 11 to conduct the first discharge pipeline 18. At the same time, the control box 25 controls the control valve 23 to open synchronously, drains the over-standard fresh water in the fresh water circulation tank 1 to the methanol discharge tank 19 for storage. After the discharge is completed, new fresh water resources are replenished through the make-up water pipeline 16 and the make-up water electric valve 17. The over-standard fresh water in the methanol discharge tank 19 is then, after the ship docks, transported to the onshore collection tank through the shore connection 22 for subsequent treatment.

[0066] In summary, the embodiment of the present invention provides a liquid-phase filling system for the outer space of a methanol fuel double-wall pipe, which can use the circulation pump 3 to transport the fresh water in the fresh water circulation tank 1 to the outer space 6 of the double-wall pipe through the outlet pipeline 2 and re-circulate it back to the fresh water circulation tank 1 through the return water pipeline 9, realizing the continuous recycling of fresh water resources. At the same time, the present application limits the working pressure in the outer space 7 of the double-wall pipe to be less than the pressure of the methanol fuel supply system, which can ensure that when the inner pipe 6 of the double-wall pipe is damaged, fresh water will not enter the inner pipe 6 of the double-wall pipe, and the leaked methanol fuel can be dissolved in the circulating fresh water. When the methanol content in the fresh water reaches the set value, the electric three-way valve 11 can be used to control the fresh water in the circulation loop to be drained to the methanol discharge tank 19 for storage through the first discharge pipeline 18 for subsequent treatment. Using the present invention can improve the safety and reliability of the methanol fuel supply system, minimize the potential threat posed by the toxicity risk of methanol to the health of crew members, and at the same time reduce the explosion risk caused by the strong volatility of methanol fuel, fully protecting the lives and property of crew members and avoiding pollution to the surrounding environment.

[0067] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principles of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention. The basic principles, main features and advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention.

[0068] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A methanol fuel double-walled pipe outer space liquid phase filling system, used to connect with a methanol fuel supply system, characterized in that: include: Fresh water circulation tank; A water outlet pipeline, the water outlet pipeline connecting the fresh water circulating water tank and the outer space of the double-walled pipe; A water return pipeline, the water return pipeline connects the fresh water circulating water tank and the outer space of the double-walled pipe, the fresh water circulating water tank, the water outlet pipeline and the water return pipeline together form a circulation loop, and the water return pipeline is provided with an electric three-way valve; A circulation pump, the circulation pump being arranged in the water outlet pipe or the water return pipe; and A methanol discharge tank, wherein a first discharge pipeline is connected between the methanol discharge tank and the electric three-way valve; Wherein, the working pressure in the outer space of the double-walled tube is lower than the pressure of the methanol fuel supply system.

2. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 1, characterized in that: Also includes: A control box, wherein the circulation pump and the electric three-way valve are both controlled by the control box.

3. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 2, characterized in that: Also includes: a first sampling sensor, the first sampling sensor being connected to the water outlet pipeline and being used to detect the methanol content of the circulating liquid in the water outlet pipeline; A second sampling sensor, the second sampling sensor is connected to the return water pipeline and is used to detect the methanol content of the circulating liquid in the return water pipeline; and A sampling control module, wherein the first sampling sensor and the second sampling sensor are both connected to the sampling control module, and the sampling control module is connected to the control box; Among them, the sampling control module is configured to obtain the methanol content value detected by the first sampling sensor and the second sampling sensor, and compare the detected methanol content value with the set value. If the detected methanol content exceeds the standard, the exceeding standard signal can be fed back to the control box, and the control box controls the electric three-way valve to conduct the first discharge pipeline; if the detected methanol content does not exceed the standard, the return water pipeline is kept conducting.

4. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 2, characterized in that: The fresh water circulation tank is also provided with a water supply pipeline, which is configured to be connected with the ship pressure water tank. The water supply pipeline is provided with a water supply electric valve, and the water supply electric valve is controlled by the control box.

5. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 4, characterized in that: A high-level sensor and a low-level sensor are provided inside the fresh water circulating water tank. The high-level sensor is configured to feed back a high-level signal to the control box when the liquid in the fresh water circulating water tank reaches a specified high level, and control the water replenishment electric valve to be closed through the control box; the low-level sensor is configured to feed back a low-level signal to the control box when the liquid in the fresh water circulating water tank reaches a specified low level, and control the water replenishment electric valve to be opened through the control box.

6. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 2, characterized in that: The water outlet pipeline is provided with a circulation electric valve, and the circulation electric valve is controlled by the control box.

7. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 2, characterized in that: The fresh water circulating water tank is also provided with a control valve, which is controlled by the control box. A second discharge pipeline is connected between the control valve and the methanol discharge tank. The control valve is configured to drain the liquid in the fresh water circulating water tank to the methanol discharge tank through the second discharge pipeline when it is opened.

8. The methanol fuel double-walled pipe outer space liquid phase filling system according to claim 2, characterized in that: Also includes: A discharge pipeline, one end of which is connected to the methanol discharge tank, and the other end of which is provided with a shore connector, wherein the shore connector is configured to connect the methanol discharge tank to a shore collection tank.

9. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 8, characterized in that: The discharge pipeline is provided with a discharge pump, and the discharge pump is controlled by the control box.

10. A methanol fuel double-walled pipe outer space liquid phase filling system according to claim 9, characterized in that: Also includes: A first local button, the first local button is connected to the control box, and the first local button is configured to control the start and stop of the circulation pump; as well as, A second local button, wherein the second local button is connected to the control box and is configured to control the start and stop of the discharge pump.

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