Methanol fuel filling system and filling skid

Abstract

The invention relates to the technical field of methanol fuel, and discloses a methanol fuel filling system and a filling skid, the methanol fuel filling system comprises a liquid pipeline, a steam pipeline, a dirty liquid discharge pipeline, a nitrogen pipeline and a methanol discharge pipeline, one end of the liquid pipeline is connected with the liquid pipeline and used for conveying methanol fuel, and the other end of the liquid pipeline is connected with the nitrogen pipeline; the liquid pipeline is connected with a first pressure gauge, a first thermometer and a first flow meter, and the liquid pipeline, the steam pipeline and the dirty liquid discharge pipeline are subjected to comprehensive inerting treatment, so that the stability and the safety of the inerting process are improved; residual liquid in the liquid pipeline, the steam pipeline and the dirty liquid discharging pipeline is conveyed to the methanol collecting tank through the methanol discharging pipeline, the methanol residual liquid is collected, the effect of detecting the pressure, the temperature and the flow of methanol fuel and methanol steam can be achieved, the liquid level transmitter and the liquid level switch can monitor the liquid level height, and the detection effect is good. And the discharge process is controllable.

Description

Technical Field

[0001] This invention relates to the field of methanol fuel technology, and in particular to a methanol fuel refueling system and a refueling skid. Background Technology

[0002] As a core carrier of international trade, the shipping industry's carbon emissions are increasingly attracting international attention. Traditional ships powered primarily by heavy oil and diesel fuel can no longer meet environmental requirements, making the search for green alternative fuels an inevitable choice for shipping companies' survival and development. Methanol, as a room-temperature liquid fuel, is safer than liquefied natural gas, ammonia, and hydrogen. Methanol fuel technology is mature, requires minimal infrastructure modifications, is inexpensive, safe to use, convenient to refuel, and has low costs, making it the best choice for green marine fuels. Methanol's combination of environmental friendliness and economy has led to a surge in orders for methanol-fueled ships, making it a priority choice for shipping companies when ordering vessels.

[0003] Chinese invention patent with publication number CN221071018U discloses a methanol fuel refueling system.

[0004] In the above technical solution, the inerting unit is connected to the refueling unit and the return unit to achieve connectivity between the refueling unit and the return unit. However, the above solution does not involve the inerting treatment of the sewage discharge pipeline, which may lead to residual air in the sewage discharge pipeline mixing with methanol fuel, posing a safety hazard. Moreover, the use of traditional nitrogen inerting or balancing methods does not involve the recovery and balanced utilization of methanol vapor, which will lead to the natural emission of methanol vapor in the ship's fuel tank, resulting in both resource waste and failure to meet environmental protection requirements. Furthermore, the above solution makes it difficult to achieve precise monitoring during the methanol refueling process. Summary of the Invention

[0005] To overcome at least one of the defects described in the prior art, this invention provides a methanol fuel refueling system and a refueling skid. The system comprehensively inertes the liquid pipeline, steam pipeline, and wastewater discharge pipeline, improving the stability and safety of the inerting process. Residual liquids from the liquid pipeline, steam pipeline, and wastewater discharge pipeline are transported to a methanol collection tank via the methanol discharge pipeline, achieving methanol residue collection. Furthermore, the system enables the detection of pressure, temperature, and flow rate of methanol fuel and methanol vapor. A level transmitter and level switch monitor the liquid level, ensuring controllable discharge processes.

[0006] The technical solution of this invention is implemented as follows: A methanol fuel refueling system and refueling skid include a liquid pipeline, a steam pipeline, a wastewater discharge pipeline, a nitrogen pipeline, and a methanol discharge pipeline. One end of the liquid pipeline is connected to a liquid pipeline for transporting methanol fuel. A first pressure gauge, a first thermometer, and a first flow meter are connected to the liquid pipeline. The first pressure gauge displays the pressure of the methanol fuel, the first thermometer displays the temperature of the methanol fuel, and the first flow meter displays the flow rate of the methanol fuel. One end of the steam pipeline is connected to a steam pipeline for transporting methanol vapor. A second pressure gauge, a second thermometer, and a second flow meter are connected to the steam pipeline. The second pressure gauge displays the pressure of the methanol vapor, and the second thermometer displays the flow rate of the methanol vapor. The temperature of the methanol vapor is displayed, and the second flow meter is used to display the flow rate of the methanol vapor. One end of the wastewater discharge pipeline is connected to the discharge pipeline for transporting contaminated methanol fuel. The nitrogen pipeline is connected to the liquid pipeline, the steam pipeline, and the wastewater discharge pipeline respectively, for inerting the air in the liquid pipeline, the steam pipeline, and the wastewater discharge pipeline. One end of the methanol discharge pipeline is connected to the liquid pipeline, the steam pipeline, and the wastewater discharge pipeline respectively, and the other end of the methanol discharge pipeline is connected to the methanol collection tank for transporting the residual methanol fuel in the liquid pipeline, the residual methanol vapor in the steam pipeline, and the contaminated residual methanol fuel in the wastewater discharge pipeline to the methanol collection tank.

[0007] Based on the above technical solutions, preferably, a first discharge valve is provided between the methanol discharge pipeline and the liquid pipeline, a second discharge valve is provided between the methanol discharge pipeline and the steam pipeline, and a third discharge valve is provided between the methanol discharge pipeline and the wastewater discharge pipeline.

[0008] Based on the above technical solutions, preferably, a first pneumatic valve for controlling the methanol fuel delivery rate is provided on the liquid pipeline, and a second pneumatic valve for controlling the methanol vapor delivery rate is provided on the steam pipeline.

[0009] Based on the above technical solutions, preferably, a first nitrogen check valve is provided between the nitrogen pipeline and the liquid pipeline, a second nitrogen check valve is provided between the nitrogen pipeline and the steam pipeline, and a third nitrogen check valve is provided between the nitrogen pipeline and the wastewater discharge pipeline.

[0010] Based on the above technical solution, preferably, a level transmitter and a level switch are installed on the methanol discharge pipeline. The level transmitter is used to monitor the liquid level height of the methanol discharge pipeline, and the level switch is connected to the level transmitter. When the level transmitter detects that the liquid level height exceeds a preset value, the level switch is turned on.

[0011] Based on the above technical solutions, preferably, it also includes a sampling valve and a sampling root valve, wherein the sampling valve and the sampling root valve are sequentially arranged and connected to the liquid pipeline.

[0012] A methanol fuel refueling skid includes the aforementioned methanol fuel refueling system, and further includes a base, a receiving plate bottom plate, and a receiving plate cofferdam plate. The receiving plate bottom plate is disposed below the receiving plate cofferdam plate, and the receiving plate bottom plate and the receiving plate cofferdam plate form a receiving plate. The base is located below the receiving plate bottom plate, and the methanol fuel refueling system is located above the receiving plate bottom plate.

[0013] Based on the above technical solutions, preferably, the system also includes a gas detector and an audible and visual alarm device. The gas detector is used to monitor the methanol fuel concentration in the refueling skid. When the methanol fuel concentration exceeds a preset value, the audible and visual alarm device issues an alarm signal.

[0014] Based on the above technical solutions, preferably, a walkway is provided on the base near the methanol fuel refueling system.

[0015] In summary, the methanol fuel refueling system and refueling skid provided by the present invention have the following advantages over the prior art: (1) The nitrogen pipeline is connected to the liquid pipeline, steam pipeline and sewage discharge pipeline respectively to inertize the air in each pipeline, so as to avoid the safety hazards caused by the residual air mixing with methanol fuel due to the lack of inertization in each pipeline, and reduce the safety risks in the methanol fuel refueling and emission process. (2) Nitrogen check valves are installed between nitrogen pipelines and other pipelines to prevent methanol from flowing back into nitrogen pipelines, avoid danger caused by mixing, and ensure the safe operation of the system. (3) The methanol fuel refueling skid is equipped with a gas detector and an audible and visual alarm device, which can monitor the methanol fuel concentration of the refueling skid in real time. When the concentration exceeds the standard, an alarm will be issued in time to remind personnel to take measures to ensure the safety of personnel and equipment. (4) The steam pipeline can connect the gas phase space of the onshore methanol storage equipment and the ship's methanol fuel tank. When the onshore methanol storage equipment increases the volume of the gas phase space and decreases the pressure due to methanol outflow, while the ship's methanol fuel tank decreases the volume of the gas phase space and increases the vapor pressure due to methanol injection, methanol vapor can enter the gas phase space of the onshore storage equipment from the fuel tank through the pipeline, so that the pressure of the two can reach a dynamic balance. This avoids the natural emission of methanol vapor in the ship's fuel tank, achieves environmental protection and resource conservation, and maintains stable refueling. (5) The liquid pipeline is connected to a first pressure gauge, a first thermometer and a first flow meter, which can display the pressure, temperature and flow rate of methanol fuel in real time; the steam pipeline is connected to a second pressure gauge, a second thermometer and a second flow meter, which can display the pressure, temperature and flow rate of methanol vapor in real time. These monitoring devices can realize the fine monitoring of the methanol refueling process, which makes it easy for operators to grasp the system operating status in a timely manner, adjust the operating parameters, and ensure the stability and efficiency of the refueling process. (6) The liquid pipeline, steam pipeline, methanol discharge pipeline and nitrogen pipeline are arranged in a centralized manner, which facilitates detection, saves space on the ship, simplifies maintenance and repair work, reduces maintenance costs, and also ensures the safety of the refueling process. (7) The receiving plate can prevent accidental leakage accidents. The receiving plate dike plate increases the liquid storage capacity of the receiving plate and improves the ability to withstand leakage accidents. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the pipeline connection according to an embodiment of the present invention; The meanings of the reference numerals in the attached drawings are as follows: 1. Liquid pipeline; 2. Steam pipeline; 3. Sewage discharge pipeline; 4. Nitrogen pipeline; 5. Methanol discharge pipeline; 6. Instrument air pipeline; 7. Filling flange; 8. First pneumatic valve; 9. First discharge valve; 10. First nitrogen check valve; 11. First pressure gauge needle valve; 12. First pressure gauge; 13. First thermometer; 14. First flow meter; 15. First flow transmitter; 16. First pressure transmitter. 17. Needle valve; 18. First pressure transmitter; 19. First flange; 20. Sampling valve; 21. Sampling root valve; 22. Return flange; 23. Second pneumatic valve; 24. Second exhaust valve; 25. Second nitrogen check valve; 26. Second pressure gauge needle valve; 27. Second pressure gauge; 28. Second thermometer; 29. ​​Second flow meter; 30. Second flow transmitter needle valve; 31. Second pressure transmitter; 32. 33. Second flange; 34. First vent flange; 35. Vent root valve; 36. Third vent valve; 37. Third nitrogen check valve; 38. Third pressure gauge needle valve; 39. Third pressure gauge; 40. Second vent flange; 41. Nitrogen inlet flange; 42. Fourth nitrogen check valve; 43. Fourth pressure gauge needle valve; 44. Level transmitter; 45. Level switch; 46. Residual liquid discharge main valve; 47. Vent check valve; 48. 49. Residual liquid discharge flange; 50. Instrument air check valve; 51. Quick coupling; 52. Receiving plate; C1. Base; C2. Supporting steel pipe; C3. Receiving plate cofferdam plate; C4. Receiving plate bottom plate; C5. Arc-shaped pad; C6. Pipe clamp; C7. Gantry bracket; C8. Walkway plate; E1. Monitoring probe; E2. Ship-shore connection area; E3. Electrical cabinet; E4. ESD button; E5. Audible and visual alarm device; E6. Explosion-proof telephone; E7. Gas detector. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] See Figure 1 Embodiment 1 of the present invention discloses a methanol fuel refueling system, including a liquid pipeline 1, a steam pipeline 2, a waste liquid discharge pipeline 3, a nitrogen pipeline 4, and a methanol discharge pipeline 5.

[0020] See Figure 1As shown in Embodiment 1, a filling flange 7 is provided at one end of the liquid pipeline 1, and a first flange 18 is provided at the other end of the liquid pipeline 1. One end of the liquid pipeline 1 is connected to the liquid pipeline, that is, the filling flange 7 is connected to the liquid pipeline, and the other end of the liquid pipeline 1 is connected to the methanol fuel tank, that is, the first flange 18 is connected to the methanol fuel tank. Methanol fuel in the liquid pipeline can be transported to the liquid pipeline 1 and discharged from the first flange 18 into the methanol fuel tank to supply fuel to the methanol fuel tank. The use of flange connection improves the safety and sealing of the connection. The standardized interface design of the filling flange 7 connecting to the liquid pipeline and the first flange 18 connecting to the methanol fuel tank facilitates the adaptation and connection of the liquid pipeline 1 with liquid pipelines and methanol fuel tanks of different specifications.

[0021] See Figure 1 As shown in this embodiment 1, a first pneumatic valve for controlling the methanol fuel delivery rate is installed on the liquid pipeline 1 near the filling flange 7. The delivery rate can be adjusted by adjusting the opening of the first pneumatic valve, which can accurately control the flow rate of the methanol fuel being filled, improve safety, and the pneumatic method has a faster response speed and is more convenient than other driving methods.

[0022] See Figure 1 As shown in Embodiment 1, a first pressure gauge 12, a first thermometer 13, and a first flow meter 14 are connected on the liquid pipeline 1 from the first pneumatic valve to the first flange 18. The first pressure gauge 12 displays the pressure value of the methanol fuel, the first thermometer 13 displays the temperature of the methanol fuel, and the first flow meter 14 displays the flow rate of the methanol fuel. A first pressure gauge needle valve 11 is also installed between the first pressure gauge 12 and the liquid pipeline 1. A first flow transmitter 15 is also connected to the first thermometer 13. The pressure, temperature, and flow rate data of the methanol fuel in the liquid pipeline 1 can be captured in real time through the first pressure gauge 12, the first thermometer 13, and the first flow meter 14. Furthermore, the flow rate of methanol fuel in liquid pipeline 1 can be detected in real time and accurately through the setting of the first flow transmitter 15, and the flow signal can be converted into a transmittable electrical signal or other standard signal, which is then fed back to the control system or display device. The first pressure gauge needle valve 11 has the characteristics of small opening and high adjustment accuracy. When closed, it can cut off the connection between the first pressure gauge 12 and liquid pipeline 1, preventing methanol fuel in liquid pipeline 1 from directly impacting the first pressure gauge 12 and avoiding damage to the first pressure gauge 12 due to instantaneous high pressure. When it is necessary to replace, repair or calibrate the first pressure gauge 12, closing the first pressure gauge needle valve 11 can prevent methanol fuel leakage, ensure the safety of the maintenance process, and reduce fuel waste. The instantaneous flow rate and cumulative flow rate of methanol can be transmitted to the ship's central control room through the first flow transmitter 15.

[0023] See Figure 1As shown, in this embodiment 1, a first pressure transmitter 17 is installed between the first flow meter 14 and the first flange 18, and a first pressure transmitter needle valve 16 is installed between the first pressure transmitter 17 and the liquid pipeline 1. The first pressure transmitter 17 enables accurate monitoring of the pressure at the end of the liquid pipeline 1, and can capture the final pressure data of methanol fuel before it enters the methanol fuel tank. Combined with the upstream pressure monitored by the first pressure gauge 12, a complete pressure monitoring chain from the beginning to the end of the liquid pipeline 1 can be formed, which more comprehensively reflects the pressure change trend of the fuel during the transportation process, and transmits the monitored pressure data to the ship's central control room.

[0024] See Figure 1 As shown in this embodiment 1, a sampling valve 19 and a sampling root valve 20 are also provided on the liquid pipeline 1. The sampling valve 19 and the sampling root valve 20 are sequentially arranged and connected to the liquid pipeline 1. The sampling valve 19 is arranged in parallel with the first pneumatic valve. The sampling valve 19 is used to directly obtain samples. When it is necessary to test key indicators such as the purity, impurity content, and density of methanol fuel, the sampling root valve 20 is opened first, and then an appropriate amount of fuel is extracted through the sampling valve 19 for testing. This allows for timely assessment of whether the fuel quality meets the ship's usage standards, and does not affect the sampling process on the liquid pipeline 1.

[0025] See Figure 1 As shown in Embodiment 1, a return gas flange 21 is provided at one end of the steam pipeline 2, and a second flange 32 is provided at the other end of the steam pipeline 2. One end of the steam pipeline 2 is connected to the steam pipeline, that is, the return gas flange 21 is connected to the steam pipeline, and the other end of the steam pipeline 2 is connected to the methanol fuel tank vent pipe, that is, the second flange 32 is connected to the methanol fuel tank vent pipe. Methanol in the steam pipeline can be transported to the steam pipeline 2 through the steam pipeline 2 and discharged from the second flange 32 to the methanol fuel tank vent pipe and discharged from the vent pipe. The use of flange connection improves the safety and sealing of the connection. The standardized interface design of the return gas flange 21 connecting to the steam pipeline and the second flange 32 connecting to the methanol fuel tank vent pipe facilitates the matching and connection of the steam pipeline 2 with steam pipelines and methanol fuel tank vent pipes of different specifications.

[0026] See Figure 1 As shown in this embodiment 1, a second pneumatic valve for controlling the methanol fuel delivery rate is installed on the steam pipeline 2 near the return gas flange 21. By adjusting the opening of the second pneumatic valve, the delivery rate can be adjusted, the flow rate of the added methanol vapor fuel can be precisely controlled, and safety can be improved. Moreover, the pneumatic method has a faster response speed and is more convenient than other driving methods.

[0027] See Figure 1As shown in Embodiment 1, a second pressure gauge 26, a second thermometer 27, and a second flow meter 28 are connected between the second pneumatic valve and the second flange 32 on the steam pipeline 2. The second pressure gauge 26 displays the pressure value of methanol vapor, the second thermometer 27 displays the temperature of methanol vapor, and the second flow meter 28 displays the flow rate of methanol vapor. A second pressure gauge needle valve 25 is also installed between the second pressure gauge 26 and the liquid pipeline 1. A second flow transmitter 29 is also connected to the second thermometer 27. The pressure, temperature, and flow rate data of methanol vapor fuel in the steam pipeline 2 can be captured in real time through the second pressure gauge 26, the second thermometer 27, and the second flow meter 28. The second flow transmitter 29 is used to detect the flow rate of methanol vapor fuel in steam pipeline 2 in real time and accurately, and convert the flow signal into a transmittable electrical signal or other standard signal, which is then fed back to the control system or display device. The second pressure gauge needle valve 25 has the characteristics of small opening and high adjustment accuracy. When closed, it can cut off the connection between the second pressure gauge 26 and steam pipeline 2, preventing the methanol vapor fuel in steam pipeline 2 from directly impacting the second pressure gauge 26 and avoiding damage to the second pressure gauge 26 due to instantaneous high pressure. When the second pressure gauge 26 needs to be replaced, repaired or calibrated, closing the second pressure gauge needle valve 25 can prevent methanol vapor fuel leakage, ensure the safety of the maintenance process, and reduce fuel waste. The instantaneous flow rate and cumulative flow rate of methanol vapor fuel can be transmitted to the ship's central control room through the second flow transmitter 29.

[0028] See Figure 1 As shown, in this embodiment 1, a second pressure transmitter 31 is installed between the second flow meter 28 and the second flange 32, and a second pressure transmitter needle valve 30 is installed between the second pressure transmitter 31 and the steam pipeline 2. The second pressure transmitter 31 enables precise monitoring of the pressure at the end of the steam pipeline 2, capturing the final pressure data before the methanol vapor fuel enters the methanol fuel tank vent pipe. Combined with the upstream pressure monitored by the second pressure gauge 26, a complete pressure monitoring chain is formed from the beginning to the end of the steam pipeline 2, more comprehensively reflecting the pressure change trend of the methanol vapor fuel during transportation, and transmitting the monitored pressure data to the ship's central control room. This design uses methanol vapor in the steam pipeline instead of traditional nitrogen, preventing the natural emission of methanol vapor from the ship's methanol fuel tank during refueling, which is not only environmentally friendly but also avoids waste. The methanol vapor enters the gas phase space of the methanol container from the ship's methanol fuel tank, balancing the negative pressure generated by the methanol outflow and maintaining stable refueling.

[0029] See Figure 1As shown in Embodiment 1, a first discharge flange 33 is provided at one end of the sewage discharge pipeline 3, and a second discharge flange 39 is provided at the other end of the sewage discharge pipeline 3. One end of the sewage discharge pipeline 3 is connected to the discharge pipeline, that is, the second discharge flange 39 is connected to the discharge pipeline, for transporting polluted methanol fuel. The other end of the sewage discharge pipeline 3 is connected to the sewage collection container, that is, the first discharge flange 33 is connected to the sewage collection container. Polluted methanol fuel in the ship can be transported to the pollution collection container through the sewage discharge pipeline 3. The first discharge flange 33 and the second discharge flange 39 strengthen the safety barrier for sewage transportation and prevent the leakage of polluted methanol fuel.

[0030] See Figure 1 As shown in Embodiment 1, a discharge root valve 34 is also installed on the sewage discharge pipeline 3. The discharge root valve 34 can realize emergency cut-off of sewage transportation and can adjust the sewage transportation rate. A third pressure gauge 38 is also installed on the sewage discharge pipeline 3. The third pressure gauge 38 is used to display the pressure value of contaminated methanol fuel. A third pressure gauge needle valve 37 is installed between the third pressure gauge 38 and the sewage discharge pipeline 3. The third pressure gauge needle valve 37 has the characteristics of small opening degree and high adjustment accuracy. When closed, it can cut off the connection between the third pressure gauge 38 and the sewage discharge pipeline 3, preventing the contaminated methanol fuel in the sewage discharge pipeline 3 from directly impacting the third pressure gauge 38 and avoiding damage to the third pressure gauge due to instantaneous high pressure. When it is necessary to replace, repair or calibrate the third pressure gauge 38, closing the third pressure gauge needle valve 37 can prevent the leakage of contaminated methanol fuel, ensure the safety of the maintenance process and reduce waste.

[0031] See Figure 1 As shown, in this embodiment 1, the nitrogen pipeline 4 is connected to the liquid pipeline 1, the steam pipeline 2, and the wastewater discharge pipeline 3, respectively, to inerte the air in the liquid pipeline 1, the steam pipeline 2, and the wastewater discharge pipeline 3. One end of the nitrogen pipeline 4 is equipped with a nitrogen inlet flange 40, which connects to a nitrogen supply device, supplying nitrogen from the nitrogen supply device to the nitrogen pipeline 4. Since the nitrogen pipeline 4 connects to the liquid pipeline 1, the steam pipeline 2, and the wastewater discharge pipeline 3 simultaneously, it can comprehensively inerte all paths that may come into contact with methanol, reducing the risk of combustion and explosion caused by residual air in different pipelines from the source.

[0032] See Figure 1As shown in Embodiment 1, a fourth nitrogen check valve 41 is installed on the nitrogen pipeline 4 near the nitrogen inlet flange 40. The fourth nitrogen check valve 41 prevents nitrogen from flowing back into the nitrogen supply device. A fourth pressure gauge 43 is also installed on the nitrogen pipeline 4 to display the nitrogen pressure value. A fourth pressure gauge needle valve 42 is installed between the fourth pressure gauge 43 and the nitrogen pipeline 4. The fourth pressure gauge needle valve 42 has the characteristics of small opening and high adjustment accuracy. When closed, it can cut off the connection between the fourth pressure gauge 43 and the nitrogen pipeline 4, preventing the nitrogen in the nitrogen pipeline 4 from directly impacting the fourth pressure gauge 43 and avoiding damage to the fourth pressure gauge 43 due to instantaneous high pressure. When it is necessary to replace, repair or calibrate the fourth pressure gauge 43, closing the fourth pressure gauge needle valve 42 can prevent nitrogen leakage, ensure the safety of the maintenance process and reduce nitrogen waste.

[0033] See Figure 1 As shown in this embodiment 1, a first nitrogen check valve 10 is installed between the nitrogen pipeline 4 and the liquid pipeline 1, a second nitrogen check valve 24 is installed between the nitrogen pipeline 4 and the steam pipeline 2, and a third nitrogen check valve 36 is installed between the nitrogen pipeline 4 and the sewage discharge pipeline 3. The first nitrogen check valve 10, the second nitrogen check valve 24 and the third nitrogen check valve 36 can prevent the reverse flow of nitrogen and ensure the stability of the inerting effect.

[0034] See Figure 1 As shown, in this embodiment 1, one end of the methanol discharge pipeline 5 is connected to the liquid pipeline 1, the steam pipeline 2, and the wastewater discharge pipeline 3, respectively. The other end of the methanol discharge pipeline 5 is equipped with a residual liquid discharge flange 48, which is connected to the methanol collection tank. That is, the residual liquid discharge flange 48 is connected to the methanol collection tank, which is used to transport the methanol fuel residue in the liquid pipeline 1, the methanol vapor residue in the steam pipeline 2, and the contaminated methanol fuel residue in the wastewater discharge pipeline 3 to the methanol collection tank. This can realize methanol recycling in the whole scenario and avoid resource waste. The residual fuel in the liquid pipeline 1, the unused methanol vapor in the steam pipeline 2, and the treatable contaminated residue in the wastewater discharge pipeline 3 are all transported to the methanol collection tank through this pipeline, breaking the limitation of the dispersed discharge of residual materials in each pipeline in the traditional system.

[0035] See Figure 1 As shown in this embodiment 1, a first discharge valve 9 is installed between the methanol discharge pipeline 5 and the liquid pipeline 1, a second discharge valve 23 is installed between the methanol discharge pipeline 5 and the steam pipeline 2, and a third discharge valve 35 is installed between the methanol discharge pipeline 5 and the sewage discharge pipeline 3. The amount of residual material conveyed at each time period can be precisely controlled through the three independent valves: the first discharge valve 9, the second discharge valve 23, and the third discharge valve 35, so as to prevent irrelevant media from entering the methanol discharge pipeline 5.

[0036] See Figure 1 As shown in this embodiment 1, a residual liquid discharge main valve 46 and a discharge check valve 47 are installed near the residual liquid discharge flange 48 on the methanol discharge pipeline 5. The residual liquid discharge main valve 46 realizes centralized control of methanol residual liquid transportation, improves operation efficiency, and serves as the main switch of the methanol discharge pipeline 5. It can uniformly control the final transportation state of the residual materials from the three pipelines of liquid, steam and sewage after they enter the discharge pipeline. In addition, the discharge check valve 47 prevents the residual liquid from flowing back, ensuring safety and environmental protection.

[0037] See Figure 1 As shown, in this embodiment 1, an instrument air line 6 is also provided. The instrument air line 6 is connected to the first pneumatic valve, the second pneumatic valve, and the residual liquid discharge main valve 46, respectively, and is used to control the opening and closing of the first pneumatic valve, the second pneumatic valve, and the residual liquid discharge main valve 46. An instrument air check valve 49 is provided on the instrument air line 6 to prevent gas backflow. A quick connector 50 is provided at one end of the instrument air line 6 for quick connection with other equipment.

[0038] See Figure 1 As shown, in this embodiment 1, a receiving plate 51 is also provided. The receiving plate 51 is used to receive leaked methanol fuel. A level transmitter 44 and a level switch 45 are provided on the methanol discharge pipeline 5. The level transmitter 44 is used to monitor the liquid level height of the methanol discharge pipeline 5. The level switch 45 is connected to the level transmitter 44. When the level transmitter 44 detects that the liquid level height exceeds a preset value, the level switch 45 is opened. The methanol discharge pipeline 5 and the receiving plate 51 are connected by a pipeline. The level transmitter 44 and the level switch 45 are located on the pipeline between the methanol discharge pipeline 5 and the receiving plate 51, so that the methanol fuel collected on the receiving plate 51 can be discharged onto the methanol discharge pipeline 5.

[0039] See Figure 2As shown in Embodiment 2, this invention discloses a methanol fuel refueling skid, including the aforementioned methanol fuel refueling system, and further including a base C1, a receiving plate bottom plate C4, and a receiving plate cofferdam plate C3. The receiving plate bottom plate C4 is disposed below the receiving plate cofferdam plate C3, and the receiving plate bottom plate C4 and the receiving plate cofferdam plate C3 form the aforementioned receiving plate 51. The base C1 is located below the receiving plate bottom plate C4, and the methanol fuel refueling system is located above the receiving plate bottom plate C4. The base C1 provides a stable mounting foundation for the entire refueling skid. The modular design allows the refueling system to be pre-assembled and tested before leaving the factory. Ships or ports only need to hoist the skid into place as a whole and connect it to the ship's fuel tank, nitrogen supply device, etc. through flanges and other interfaces to put it into use. This greatly shortens the on-site installation time and reduces the requirements for modifying the ship's original infrastructure. The closed space formed by the bottom plate C4 and the cofferdam plate can quickly collect leaked methanol fuel or residual liquid, preventing it from dripping directly onto the ship's deck or port ground and causing pollution. It also avoids safety accidents caused by the leaked liquid coming into contact with ignition sources.

[0040] The methanol refueling liquid pipeline 1, steam pipeline 2, shipboard methanol waste discharge pipeline 5, nitrogen pipeline 4, and their interfaces are centrally arranged on the refueling skid. This facilitates shore-to-ship connection, interface inspection and monitoring, saves shipboard space, simplifies maintenance and repair work, reduces maintenance costs, and ensures the safety of the refueling process. Furthermore, the installed receiving plate cofferdam C3 ensures that the receiving plate 51 has a large storage capacity, increasing its liquid storage capacity and improving the refueling station's ability to withstand leakage accidents. See Figure 2 As shown in this embodiment 2, a walkway C8 is provided on the base C1 near the methanol fuel refueling system to facilitate pedestrian passage.

[0041] See Figure 2 As shown in this embodiment 2, multiple supporting steel pipes C2 are provided above the receiving plate C4. The supporting steel pipes C2 are longitudinally spaced above the receiving plate C4. An arc-shaped pad C5 is provided above the supporting steel pipes C2. The arc-shaped pad C5 is welded and fixed to the supporting steel pipes C2. One end of the liquid pipeline 1 and the steam pipeline 2 are mounted on the arc-shaped pad C5 and fixedly connected to the arc-shaped pad C5. A portal frame C7 is also provided above the receiving plate C4. A pipe clamp C6 is also provided on the portal frame C7. The nitrogen pipeline 4 and the methanol discharge pipeline 5 can be fixed on the portal frame C7 through the pipe clamp C6.

[0042] See Figure 2As shown, in this embodiment 2, a gas detector E7 and an audible and visual alarm device E5 are also included. The gas detector E7 is used to monitor the methanol fuel concentration of the refueling skid. When the methanol fuel concentration exceeds a preset value, the audible and visual alarm device E5 issues an alarm signal. Both the gas detector E7 and the audible and visual alarm device E5 are mounted on the base C1. The base C1 is also equipped with a monitoring probe E1, a ship-shore connection area E2, an electrical cabinet E3, an ESD button E4, and an explosion-proof telephone E6. The ESD button is an emergency stop button. The gas detector E7 monitors the methanol concentration around the skid in real time. Once the concentration exceeds a preset value, the alarm will be triggered. Upon setting, the audible and visual alarm device E5 immediately issues a simultaneous warning via sound and light signals, alerting operators to promptly investigate the leak point and prevent a continued increase in concentration that could lead to a combustion or explosion. The ESD button E4 serves as the last line of defense in emergencies, quickly shutting off the entire refueling system and significantly enhancing the system's ability to respond to sudden safety incidents. Furthermore, the monitoring probe E1 records the operating status of each component in the refueling skid, facilitating remote monitoring and post-incident traceability. The electrical cabinet centrally integrates the system's electrical control components, including the gas detector E7, alarm devices, and monitoring probe E5. 1. The ESD button E4 and the explosion-proof telephone E6 provide stable power supply and signal transmission support, ensuring the coordinated operation of all equipment. The ship-shore connection area E2 provides a standardized interface for docking between the ship and the port refueling facilities, facilitating the rapid establishment of fuel delivery and signal transmission. The explosion-proof telephone E6 ensures reliable communication between operators in hazardous environments where methanol leakage may occur. Especially after the alarm device is activated, it can quickly coordinate emergency response measures and avoid delays in rescue due to communication interruptions. Placing the explosion-proof telephone E6 on the refueling skid facilitates centralized control of the refueling skid site, shore-based refueling equipment, and the ship. The improved communication in the control room enhances the efficiency of communication throughout the refueling process and ensures the overall safety of the system. The placement of audible and visual alarms on the refueling skid increases the safety level of the surrounding environment and strengthens the safety awareness of on-site operators. Furthermore, the interlocking of the audible and visual alarms with the on-site gas detector E7 and the central control room's abnormal alarm ensures immediate alerts for any problems, further improving the safety of the refueling system. The placement of the ESD button E4 on the refueling skid allows on-site refueling supervisors to quickly address any abnormalities, improving their ability to respond to safety incidents.

[0043] Specific implementation steps: Before methanol fuel refueling, nitrogen is supplied to nitrogen pipeline 4 via a nitrogen supply device, and nitrogen is introduced into liquid pipeline 1, steam pipeline 2, and wastewater discharge pipeline 3 to purge air from these pipelines. During methanol fuel refueling, liquid pipeline 1 is connected to the liquid pipeline, the first pneumatic valve is opened, and sampling valve 19, the root valve of sampling valve 19, the first discharge valve 9, and the first nitrogen check valve 10 are closed. Meanwhile, the first pressure gauge needle valve 11 and the first pressure transmitter needle valve 16 are opened, and the first flow meter 14, the first pressure transmitter 17, and the first flow transmitter 15 are energized and in normal working condition. The first pressure gauge 12 and the first thermometer 13 are also functioning normally. After the onshore methanol refueling pump starts, methanol fuel is injected from the onshore storage equipment into the ship's methanol fuel tank through liquid pipeline 1. During methanol steam refueling, steam pipeline 2 is connected to the steam pipeline, the second pneumatic valve is opened, and the second discharge valve 23 and the second nitrogen check valve... 24 is closed, while the second pressure gauge needle valve 25 and the second pressure transmitter needle valve 30 are open. The second flow meter 28, the second pressure transmitter 31, and the second flow transmitter 29 are energized and in normal working condition. The second pressure gauge 26 and the second thermometer 27 are working normally. The onshore methanol refueling pump starts, the volume of the gas phase space of the onshore methanol storage equipment increases, and the gas phase pressure decreases. After methanol vapor is injected into the ship's methanol fuel tank, the volume of the gas phase space of the fuel tank decreases, and the methanol vapor pressure increases. After connecting the gas phase space of the onshore methanol storage equipment and the gas phase space of the ship's methanol fuel tank through the steam pipeline, methanol vapor enters the gas phase space of the onshore methanol storage equipment from the fuel tank through the steam pipeline, and the pressure of the two can reach dynamic equilibrium. When methanol arrives at the port, it is connected to the sewage discharge pipeline through sewage discharge pipeline 3, and the discharge root valve 34 is opened to discharge methanol into the sewage collection container; the first discharge valve 9, the second discharge valve 23 and the third discharge valve 35 are opened to transport the methanol dye liquid in liquid pipeline 1, the methanol residue in steam pipeline 2 and the methanol residue in sewage discharge pipeline 3 to the methanol collection tank. When the level transmitter 44 detects that the methanol fuel level exceeds the preset value, the level switch 45 is opened and closed to discharge the methanol residue into the methanol collection tank.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A methanol fuel refueling system, characterized in that, This includes a liquid pipeline (1), a steam pipeline (2), a wastewater discharge pipeline (3), a nitrogen pipeline (4), and a methanol discharge pipeline (5), among which, One end of the liquid pipeline (1) is connected to a liquid pipeline for transporting methanol fuel. A first pressure gauge (12), a first thermometer (13), and a first flow meter (14) are connected to the liquid pipeline (1). The first pressure gauge (12) is used to display the pressure value of the methanol fuel, the first thermometer (13) is used to display the temperature of the methanol fuel, and the first flow meter (14) is used to display the flow rate of the methanol fuel. One end of the steam pipeline (2) is connected to the steam pipeline for transporting methanol vapor. A second pressure gauge (26), a second thermometer (27), and a second flow meter (28) are connected to the steam pipeline (2). The second pressure gauge (26) is used to display the pressure value of the methanol vapor, the second thermometer (27) is used to display the temperature of the methanol vapor, and the second flow meter (28) is used to display the flow rate of the methanol vapor. One end of the wastewater discharge pipeline (3) is connected to the discharge pipeline for transporting polluted methanol fuel; The nitrogen pipeline (4) is connected to the liquid pipeline (1), the steam pipeline (2) and the sewage discharge pipeline (3) respectively, and is used to inert the air in the liquid pipeline (1), the steam pipeline (2) and the sewage discharge pipeline (3); One end of the methanol discharge pipeline (5) is connected to the liquid pipeline (1), the steam pipeline (2) and the waste liquid discharge pipeline (3) respectively, and the other end of the methanol discharge pipeline (5) is connected to the methanol collection tank, for transporting the methanol fuel residue in the liquid pipeline (1), the methanol vapor residue in the steam pipeline (2) and the contaminated methanol fuel residue in the waste liquid discharge pipeline (3) to the methanol collection tank.

2. The methanol fuel refueling system according to claim 1, characterized in that, A first discharge valve (9) is provided between the methanol discharge pipeline (5) and the liquid pipeline (1), a second discharge valve (23) is provided between the methanol discharge pipeline (5) and the steam pipeline (2), and a third discharge valve (35) is provided between the methanol discharge pipeline (5) and the sewage discharge pipeline (3).

3. The methanol fuel refueling system according to claim 1, characterized in that, The liquid pipeline (1) is equipped with a first pneumatic valve (8) for controlling the methanol fuel delivery rate, and the steam pipeline (2) is equipped with a second pneumatic valve (22) for controlling the methanol steam delivery rate.

4. A methanol fuel refueling system according to claim 1, characterized in that, A first nitrogen check valve (10) is provided between the nitrogen pipeline (4) and the liquid pipeline (1), a second nitrogen check valve (24) is provided between the nitrogen pipeline (4) and the steam pipeline (2), and a third nitrogen check valve (36) is provided between the nitrogen pipeline (4) and the sewage discharge pipeline (3).

5. A methanol fuel refueling system according to claim 2, characterized in that, A level transmitter (44) and a level switch (45) are installed on the methanol discharge pipeline (5). The level transmitter (44) is used to monitor the liquid level of the methanol discharge pipeline (5). The level switch (45) is connected to the level transmitter (44). When the level transmitter (44) detects that the liquid level exceeds a preset value, the level switch (45) is turned on.

6. A methanol fuel refueling system according to claim 1, characterized in that, It also includes a sampling valve (19) and a sampling root valve (20), which are sequentially arranged and connected to the liquid pipeline (1).

7. A methanol fuel refueling skid, comprising the methanol fuel refueling system as described in any one of claims 1-6, characterized in that, It also includes a base (C1), a receiving plate bottom plate (C4), and a receiving plate cofferdam plate (C3). The receiving plate bottom plate (C4) is located below the receiving plate cofferdam plate (C3). The receiving plate bottom plate (C4) and the receiving plate cofferdam plate (C3) form a receiving plate (51). The base (C1) is located below the receiving plate bottom plate (C4), and the methanol fuel refueling system is located above the receiving plate bottom plate (C4).

8. A methanol fuel refueling skid according to claim 7, characterized in that, It also includes a gas detector (E7) and an audible and visual alarm device (E5). The gas detector (E7) is used to monitor the methanol fuel concentration in the refueling skid. When the methanol fuel concentration exceeds a preset value, the audible and visual alarm device (E5) issues an alarm signal.

9. A methanol fuel refueling skid according to claim 7, characterized in that, A walkway (C8) is provided on the base (C1) near the methanol fuel refueling system.

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