Methanol fuel liquid supply device and debugging method

Abstract

The invention discloses a methanol fuel liquid supply device and a debugging method, the methanol fuel liquid supply device comprises a methanol fuel cabin and a methanol fuel liquid supply unit, the methanol fuel cabin is used for storing methanol; the methanol fuel liquid supply unit comprises a liquid inlet pipeline as well as a first control valve, a pressure boosting and stabilizing assembly and a second control valve which are sequentially communicated in the liquid inlet direction of the liquid inlet pipeline, the liquid inlet pipeline is connected with the methanol fuel cabin, and the pressure boosting and stabilizing assembly sequentially comprises a first boosting device, an air pressure buffer device and a second boosting device in the liquid inlet direction. According to the methanol fuel liquid supply device, by arranging the pressure boosting and stabilizing assembly, stable liquid supply of methanol fuel can be rapidly achieved, and the debugging time is saved. According to the debugging method, the methanol fuel liquid supply device on the ship is debugged in the mooring stage, rapid debugging can be achieved through the adopted debugging method, the wharf mooring test period is greatly shortened, the mooring period can be shortened by 4-5 days, and the expenditure proportion is reduced by about 20%.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a methanol fuel liquid supply device and a debugging method. Background Art

[0002] With technological advancements and the diversification of energy sources, marine fuels are no longer limited to light and heavy oil fuels. The development of green energy is driving the replacement of alternative fuels such as liquefied natural gas and plant-based methanol, providing a preferred option for reducing carbon emissions and promoting green travel. With the emergence of technologies such as the rational utilization of plant-based fuels and the continuous iteration of new fuel equipment technologies, the industry is also placing higher demands on the innovation of fuel-using equipment.

[0003] When using hydrocarbon fuels for combustion, there are unfavorable factors such as sulfur content, incomplete combustion to produce black smoke, and easy carbon deposition. Methanol fuel has a complete combustion condition, only produces water and carbon dioxide, and its combustion is more environmentally friendly and more conducive to green travel. It is also cleaner and can be used at room temperature. At present, the conditions for ships to use methanol as a fuel are mature. However, existing ships only debug the methanol fuel daily system during the sea trial phase. Since it is an initial debugging, the debugging cycle is relatively long. How to realize the complete installation and joint debugging of the methanol fuel daily system during the dock mooring phase before sailing at sea and save the debugging cycle has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a methanol fuel liquid supply device and debugging method, which can greatly save the equipment debugging cycle by implementing project debugging during the dock mooring stage, and provide reliable guarantees for predicting risks in marine navigation tests and saving trial periods.

[0005] In order to achieve the above-mentioned and other related purposes, the present invention provides a methanol fuel liquid supply device, comprising:

[0006] Methanol fuel tank, used to store methanol;

[0007] The methanol fuel liquid supply unit includes a liquid inlet pipeline and a first control valve, a boost and pressure stabilizing assembly and a second control valve which are sequentially connected along the liquid inlet direction of the liquid inlet pipeline, wherein the liquid inlet pipeline is connected to the methanol fuel tank; the boost and pressure stabilizing assembly includes a first boosting device, an air pressure buffer device and a second boosting device in sequence along the liquid inlet direction.

[0008] Optionally, the methanol fuel liquid supply unit further includes:

[0009] a heat exchanger, disposed between the first boosting device and the air pressure buffer device;

[0010] The filter is arranged between the second boosting device and the second control valve.

[0011] Optionally, the methanol fuel liquid supply unit further includes:

[0012] A temperature sensor is provided between the first control valve and the pressure boosting and stabilizing component;

[0013] The pressure sensor is arranged between the first control valve and the pressure boosting and stabilizing component.

[0014] Optionally, the methanol fuel liquid supply device further includes:

[0015] The fuel valve group delivery unit is connected to the liquid outlet end of the liquid inlet pipeline and is connected to the air pressure buffer device;

[0016] The gas user end is connected to the fuel valve group delivery unit;

[0017] The return liquid pipeline is connected to the gas user end at one end and to the methanol fuel tank at the other end.

[0018] Optionally, the methanol fuel liquid supply device further includes:

[0019] A gas-liquid separator is connected to the methanol fuel tank and the liquid return line;

[0020] a first nitrogen purge circuit, wherein the air inlet of the first nitrogen purge circuit is connected to the liquid outlet of the first booster device, and the nitrogen passes from the liquid outlet of the first booster device through the air pressure buffer device to the gas-liquid separator;

[0021] A second nitrogen purge circuit, wherein the air inlet of the first nitrogen purge circuit is connected to the liquid outlet of the first booster device, and the nitrogen flows from the liquid outlet of the first booster device through the air pressure buffer device and the second booster device to the gas-liquid separator;

[0022] The third nitrogen purge loop is connected to the fuel valve group delivery unit and is connected to the liquid return pipeline through the fuel valve group delivery unit. The gas-liquid separator is connected to the liquid return pipeline.

[0023] Optionally, the methanol fuel liquid supply unit further includes:

[0024] The controller is control-connected to the pressure-boosting and pressure-stabilizing component, the first control valve, and the second control valve.

[0025] The present invention provides a method for debugging a methanol fuel liquid supply device, which uses the above-mentioned methanol fuel liquid supply device and includes:

[0026] The methanol fuel liquid supply device on the ship is debugged during the mooring phase.

[0027] Optionally, the step of debugging the methanol fuel liquid supply device in the ship during the mooring phase includes:

[0028] Close the first control valve and the second control valve, and perform nitrogen purge and nitrogen leakage test on the methanol fuel liquid supply unit in the methanol fuel liquid supply device;

[0029] Open the first control valve and operate the first and second boosting devices. The first boosting device increases the pressure of the methanol to a first pressure value, and the second boosting device further increases the pressure of the methanol to a second pressure value after the pressure has been increased to the first pressure value.

[0030] Keep the second control valve closed and test the variable frequency mode of the first and second boosting devices. In the closed operating state where the pipeline of the methanol fuel liquid supply unit is filled with methanol, operate the first and second boosting devices in a low-frequency mode. Under the action of the air pressure buffer device, maintain the pressure stable at the second pressure value.

[0031] Open the second control valve, and methanol flows from the methanol fuel liquid supply unit to the fuel valve group delivery unit and enters the fuel user end.

[0032] Optionally, after the step of opening the second control valve and allowing methanol to flow from the methanol fuel supply unit to the fuel valve group delivery unit and then to the fuel user end, the method further includes:

[0033] While keeping the second control valve of the methanol fuel supply unit open, test the first and second boosting devices to run continuously for at least half an hour to ensure that no low pressure alarms or pump group failures occur.

[0034] Optionally, after the step of testing that the first and second boosting devices continuously operate for at least half an hour while keeping the second control valve of the methanol fuel liquid supply unit open to ensure that no low pressure alarm or pump group failure occurs, the method further includes:

[0035] When the methanol fuel liquid supply unit stops supplying liquid, the overall pressure of the methanol fuel liquid supply unit is gradually reduced, and the second control valve is closed.

[0036] Compared with the prior art, the methanol fuel liquid supply device and debugging method of the present invention have at least the following beneficial effects:

[0037] The methanol fuel supply device of the present invention includes a methanol fuel tank for storing methanol and a methanol fuel supply unit. The methanol fuel tank is used to store methanol. The methanol fuel supply unit includes an inlet pipeline and a first control valve, a pressure-boosting and pressure-stabilizing assembly, and a second control valve, which are sequentially connected along the inlet direction of the inlet pipeline. The inlet pipeline is connected to the methanol fuel tank. The pressure-boosting and pressure-stabilizing assembly includes a first pressure-boosting device, a pressure-buffering device, and a second pressure-boosting device, which are sequentially connected along the inlet direction. By providing the pressure-boosting and pressure-stabilizing assembly, the methanol fuel supply device of the present invention can quickly achieve a stable supply of methanol fuel, saving commissioning time.

[0038] The present invention's method for debugging a methanol fuel liquid supply device involves debugging the device on a vessel during the mooring phase, reducing testing and debugging time during sea travel and saving testing costs. This method enables rapid debugging, significantly shortening the mooring test cycle by 4-5 days and reducing costs by approximately 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a methanol fuel liquid supply device according to an embodiment of the present invention;

[0040] Figure 2 This is a flow chart of the human-machine interface logic control PLD in an embodiment of the present invention.

[0041] List of reference numerals:

[0042] 1 Methanol fuel tank

[0043] 2 Liquid inlet pipeline

[0044] 3. First control valve

[0045] 4. First booster device

[0046] 5. Air pressure buffer device

[0047] 6 Second booster

[0048] 7 Heat exchanger

[0049] 8 Filters

[0050] 9 Second control valve

[0051] 10 Controller

[0052] 101 PLC touch screen

[0053] 11 Fuel valve group delivery unit

[0054] 12 Nitrogen storage device

[0055] 13 Fuel User Terminal

[0056] 14 Liquid return line

[0057] 15 Gas-liquid separator

[0058] 16 Third control valve

[0059] 17 Bracket

[0060] 18 Methanol fuel supply unit

[0061] 19 Temperature Sensor

[0062] 20 pressure sensors DETAILED DESCRIPTION

[0063] The following specific embodiments illustrate the embodiments of the present invention. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features of the embodiments may be combined with each other unless they conflict.

[0064] It should be noted that the diagrams provided in the embodiments of the present invention are only schematic illustrations of the basic concept of the present invention. Although the diagrams only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation, the form, quantity, and proportion of each component in actual implementation can be changed at will, and the component layout form may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of this application. Therefore, they have no technical significance. Any structural modification, change in proportional relationship, or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose of the present invention.

[0065] Example 1

[0066] This embodiment provides a methanol fuel liquid supply device, referring to Figure 1 The methanol fuel liquid supply device includes a methanol fuel tank 1 and a methanol fuel liquid supply unit 18.

[0067] Among them, the methanol fuel tank 1 is used to store methanol. The methanol fuel liquid supply unit 18 includes a liquid inlet pipeline 2 and a first control valve 3, a boost and pressure stabilizing component and a second control valve 9 arranged along the liquid inlet direction of the liquid inlet pipeline 2. The liquid inlet pipeline 2 is connected to the methanol fuel tank 1, and the liquid inlet pipeline 2 includes a liquid inlet end and a liquid outlet end. The first control valve 3 is arranged at the liquid inlet end of the liquid inlet pipeline 2 and is connected to the liquid inlet pipeline 2. Along the direction from the liquid inlet end to the liquid outlet end, the boost and pressure stabilizing component is arranged after the first control valve 3 and is connected to the liquid inlet pipeline 2. The boost and pressure stabilizing component includes a first boosting device 4, an air pressure buffer device 5 and a second boosting device 6. The first boosting device 4 is connected to the first control valve 3, the air pressure buffer device 5 is connected to the first boosting device 4, and the second boosting device 6 is connected to the air pressure buffer device 5. The first pressurizing device 4 is used to pressurize the methanol entering the liquid inlet pipeline 2 to a first pressure value. The air pressure buffer device 5 buffers this pressure value before it enters the second pressurizing device 6, which then pressurizes the methanol from the first pressure value to a second pressure value. In this embodiment, the first pressurizing device 4 is a supply pump, the air pressure buffer device 5 is a buffer collection cabinet, and the second pressurizing device 6 is a booster pump. A second control valve 9 is installed on the liquid inlet pipeline 2, after the second pressurizing device 6.

[0068] Optionally, a temperature sensor 19 and a pressure sensor 20 are further provided between the first control valve 3 and the boost and pressure stabilizing assembly to detect the pressure and temperature of the incoming methanol. Optionally, a heat exchanger 7 is provided between the first boosting device 4 and the air pressure buffer device 5. In order to prevent low-temperature ice formation from clogging the pipeline, a heat exchanger 7 is added to the pipeline system to heat the methanol medium in the pipeline and control the methanol temperature value range to be controlled within 10 to 35 degrees before entering the machine. This is more convenient for equipment management and implementation than low-temperature liquefied LNG. In the direction from the liquid inlet to the liquid outlet, a filter 8 is further provided after the boost and pressure stabilizing assembly. The filter 8 is used to filter the incoming methanol. In this embodiment, the heat exchanger 7 is an ethylene glycol heat exchanger and the filter 8 is a double filter.

[0069] The methanol fuel supply unit 18 also includes a controller 10, which is controllably connected to the boost and pressure stabilization assembly, the first control valve 3, and the second control valve 9 to control the opening and closing of the first and second control valves 3 and 9, as well as the activation and mode switching of the boost device within the boost and pressure stabilization assembly. Optionally, the controller 10 is also controllably connected to a temperature sensor 19 and a pressure sensor 20. Optionally, the controller 10 is an electrical control box equipped with a PLC touch screen 101 to facilitate human-machine interface operation and management. The electrical control box establishes a human-machine interface interaction mode using various sensors. Signals from the PLC touch screen 101 and sensors are sent to the electrical control box, which, through module logic control, automatically operates the methanol fuel supply unit's supply pump, boost pump, and adjusts various control valves.

[0070] Optionally, the methanol fuel supply device further includes a bracket 17. The equipment of the methanol fuel supply unit 18 is integrated onto the bracket 17 in a skid-like design. The bracket 17 supports the entire methanol unit equipment, further facilitating modular integration of the system equipment. The various components within the methanol fuel supply unit 18 are connected using stainless steel flanges. The liquid inlet line 2 is a double-walled pipe. The inner wall of the double-walled pipe (stainless steel) allows the flow of the methanol working medium. The outer wall of the double-walled pipe is also made of stainless steel. The space between the outer and inner pipes is filled with flowing air. Any methanol leak can be detected, and an alarm can be issued if a leak occurs.

[0071] Optionally, the methanol fuel supply device further includes a fuel valve group delivery unit 11, a fuel user end 13 and a return liquid pipeline 14. The fuel valve group delivery unit 11 is connected to the liquid outlet end of the liquid inlet pipeline 2 to receive the methanol delivered from the methanol fuel supply unit 18. The fuel valve group delivery unit 11 is also connected to the air pressure buffer device 5. When there is excess methanol fuel in the fuel valve group delivery unit 11, the excess methanol will be re-introduced into the air pressure buffer device 5. The fuel valve group delivery unit 11 is also communicatively connected to a security system that can stop methanol delivery in the event of a fault or alarm. The fuel user end 13 is connected to the fuel valve group delivery unit 11 to receive the methanol fuel output by the fuel valve group delivery unit 11. One end of the return liquid pipeline 14 is connected to the gas user end, and the other end is connected to the methanol fuel tank 1. The remaining methanol from the fuel user end 13 can be returned to the methanol fuel tank 1 through the return liquid pipeline 14.

[0072] The methanol fuel liquid supply device also includes a gas-liquid separator 15, a first nitrogen purge circuit, and a second nitrogen purge circuit. The gas-liquid separator 15 is connected to the methanol fuel tank 1. The air inlet of the first nitrogen purge circuit is connected to the liquid outlet of the first booster 4. Nitrogen flows from the liquid outlet of the first booster 4 through the air pressure buffer device 5 to the gas-liquid separator 15. The air inlet of the second nitrogen purge circuit is connected to the liquid outlet of the first booster 4. Nitrogen flows from the liquid outlet of the first booster 4 through the air pressure buffer device 5 and the second booster 6 to the gas-liquid separator 15. The nitrogen purge is used to purge methanol accumulated inside the pipeline. The gas-liquid separator 15 receives the mixture of nitrogen and methanol purged from the first and second nitrogen purge circuits, separates the nitrogen and methanol, and passes the separated methanol into the methanol fuel tank 1. The nitrogen is collected in the nitrogen storage device.

[0073] The methanol fuel supply device also includes a third nitrogen purge circuit. A nitrogen storage device 12 is connected to the fuel valve assembly delivery unit 11 and, via the fuel valve assembly delivery unit 11, to a liquid return line 14. This nitrogen purge circuit is used to purge methanol accumulated within the fuel valve assembly delivery unit 11. The purged nitrogen and methanol mixture is then passed through the liquid return line 14 to a gas-liquid separator 15. The gas-liquid separator 15 separates the nitrogen and methanol mixture purged from the liquid return line 14. Optionally, the methanol fuel supply device also includes a flow control line connected from the liquid outlet of the first boosting device 4 to the gas-liquid separator 15. A third control valve 16 is provided on the flow control line. This flow control line can divert fluid from the liquid inlet line 2 when the flow rate is excessive, and replenish the fluid in the liquid inlet line 2 when the flow rate is insufficient. Optionally, the first control valve 3, the second control valve 9 and the third control valve 16 are all pneumatic control valves, which use pneumatic control to facilitate automatic switching control. The pneumatic control valves use instrument air supply to open the opening mode and automatically lock in the air cut-off mode to protect production safety.

[0074] In this embodiment, the methanol medium within the methanol fuel supply system flows from the methanol fuel tank 1 through the liquid inlet line 2 to the first control valve 3, then into the first booster 4 where it is pressurized to a first pressure value. It then enters the air pressure buffer 5 and flows to the second booster 6 where it is pressurized to a second pressure value. After passing through the first booster 4 and before flowing to the air pressure buffer 5, the fluid undergoes temperature control via a heat exchanger 7 to achieve the desired stable temperature state. In this embodiment, the heat exchanger 7 is a water-glycol heat exchanger 7. The hot water glycol circulating within the water-glycol heat exchanger 7 is cooled by a low-temperature water plate to maintain thermal equilibrium. After passing through the second booster 6, the hot water is finely filtered by a filter 8. It then passes through the second control valve 9 and flows to the fuel valve assembly delivery unit 11 before entering the gas user. Excess fuel in the fuel valve assembly delivery unit 11 is then returned to the air pressure buffer 5 to stabilize and buffer the pressure, preventing sudden pressure changes. Any remaining methanol at the gas user's end is returned to the methanol fuel tank 1 via the liquid return line 14.

[0075] The first nitrogen purge path includes nitrogen from the nitrogen storage device 12 through the air pressure buffer device 5 to the gas-liquid separator 15. The second nitrogen purge path includes nitrogen from the nitrogen storage device 12 through the air pressure buffer device 5 and the second pressurizing device 6 to the gas-liquid separator 15. The third nitrogen purge path includes nitrogen from the nitrogen storage device 12 through the fuel valve group delivery unit 11 and the liquid return line 14 to the gas-liquid separator 15.

[0076] Example 2

[0077] This embodiment provides a methanol fuel debugging method, which uses the methanol fuel liquid supply device described in Example 1. The method includes combining methanol fuel liquid supply modules to form a methanol fuel liquid supply device, and debugging the methanol fuel liquid supply device during the mooring phase.

[0078] Reference Figure 2 The steps for commissioning the methanol fuel liquid supply device during the mooring phase include:

[0079] S1: Close the first control valve 3 and the second control valve 9, and perform nitrogen purge and nitrogen leakage test on the methanol fuel liquid supply unit 18 in the methanol fuel liquid supply device;

[0080] Before performing a nitrogen purge, perform preparatory work. Ensure that methanol is fully filled and all valves in the methanol fuel system are in place to ensure proper methanol flow. Connect the relevant pneumatic control valves to the instrument air supply. The security system establishes communication with the fuel valve assembly delivery unit 11 and enables touchscreen operation on the human-machine interface.

[0081] After the methanol fuel supply system has been installed and verified, and the external double-wall pipes and methanol fuel tank 1 have been filled, power is applied for initial commissioning. Upon powering on and in the HMI (Human Machine Interface) mode, check the communication status of each control valve position on the PLC touch screen 101, specifically for abnormal valve positions of the corresponding pneumatic control valves. If a red "Error" alarm appears on the screen, disconnect the corresponding wiring according to the internal wiring diagram and use a multimeter to check communication. If communication is normal, check for abnormal mechanical travel switches on the corresponding valve position controllers. The emergency manual switch on the valve position controller can be used to operate the valve position. If the valve position is in the open position, visually check whether the mechanical valve position moves to the open position. Conversely, if the valve position is in the "Closed" position, check whether the mechanical valve position moves toward the closed position. After confirming that the valve position is correctly opened on the HMI, simulate an emergency stop signal for safety testing. After inputting the ESD emergency stop signal, the HMI displays that all pumps have stopped and all other pneumatic valves have switched to the "Fault" position. Press the reset button to return to the stop interface, manually press the "Emergency Stop" button on the HMI, check that all pumps on the HMI have stopped running and all pneumatic valves have turned to the "Fault" position.

[0082] Perform a purge test on the HMI (human-machine interface). This test checks that the first and second control valves 3 and 9 at each inlet and outlet of the fuel system are closed, purging the system back into the buffer collection cabinet and methanol fuel tank 1. The system interface indicates that the fuel tank and gas user are isolated. The purge process purges the remaining medium in the methanol fuel liquid supply unit 18 pipeline, passing through the fuel user and returning to the methanol fuel tank. During the test, if there are no other related alarms on the interface, the system process will exit the STARTUP process and proceed to the next step. If an alarm is displayed, the maintenance process "Maintenance" will be highlighted, indicating that the repair item or disassembly is required. The process will return to the purge process, and the system process will be in an endless loop.

[0083] Perform a nitrogen leak test on the HMI interface. While maintaining methanol fuel inside the unit piping system, manually press the "Nitrogen Leak Test" button on the HMI interface. The test purpose is to test whether there is a leak alarm in the double-walled pipe from the fuel tank to the liquid supply unit. The HMI system self-checks and no related leak alarms are reported. The process continues to execute and displays "Leak Test Completed". The system process jumps out of the "Startup Process" to prepare for startup.

[0084] S2: Open the first control valve 3 and operate the first boosting device 4 and the second boosting device 6. The first boosting device 4 increases the pressure of the methanol to a first pressure value, and the second boosting device 6 further increases the pressure of the methanol to a second pressure value after the pressure has been increased to the first pressure value.

[0085] Perform the "Startup Process" startup preparation test on the HMI interface. After the system leak test is completed and the nitrogen purge process is complete, exit the "Startup Process" startup preparation, open the first control valve 3, place the supply pump and booster pump HMI interface in the "Manual" position, manually start the supply pump and booster pump, and simultaneously check the pump's operating direction and the system pipeline pressure increase. After the supply pump is pressurized, the pressure value reaches 3-4 Bar, which is the first pressure value; after the booster pump is pressurized, the pressure value reaches 8-9 Bar, which is the second pressure value. Visually check the pressure on the outlet pressure display of the methanol fuel liquid supply unit 18 to see if it reaches 8-9 Bar.

[0086] S3: Keeping the second control valve 9 closed, test the variable frequency mode of the first boosting device 4 and the second boosting device 6. In the closed operating state where the pipeline of the methanol fuel liquid supply unit 18 is filled with methanol, operate the first boosting device 4 and the second boosting device 6 in a low frequency mode. Under the action of the air pressure buffer device 5, the pressure is kept stable at the second pressure value.

[0087] Perform a "start-up standby" mode test on the HMI human-machine interface, keep the outlet valve (second control valve 9) of the methanol fuel supply unit 18 closed, test the VFD (variable frequency mode) of the supply pump and the boost pump, and operate in a low-frequency mode when the methanol fuel supply unit 18 is filled with methanol fluid and in a closed operating state, and maintain the outlet pressure of the methanol fuel supply unit 18 at 8-9 Bar. The fuel user can be provided with a stable 8-9 Bar methanol supply at any time under the operation instructions of the fuel user and the control room.

[0088] S4: Open the second control valve 9, and methanol flows from the methanol fuel liquid supply unit 18 to the fuel valve group delivery unit 11, and then enters the fuel user end 13.

[0089] Test the "main process" function on the HMI interface. The functional test is carried out through the previous valve position control debugging. The outlet valve (second control valve 9) of the methanol fuel supply unit 18 is debugged to automatically open under process control, so that the methanol fluid enters the fuel valve group delivery unit 11 and enters the main engine / generator user (fuel user end 13), and can keep the pressure stable in a short time.

[0090] Test the "Run" function on the HMI interface, keep the outlet valve of the liquid supply unit in automatic opening mode, and test that the supply pump and booster pump work continuously for more than half an hour. Ensure that there is no low pressure alarm or pump group failure.

[0091] Test the "Stop" function on the HMI interface. After manually pressing the "Stop" button, the program stops the supply pump and boost pump. The liquid supply unit can smoothly stop supplying liquid to the host / generator users, gradually reducing the overall pressure of the system piping. The second control valve 9 is closed, isolating the methanol fuel liquid supply unit 18 from the fuel valve group delivery unit 11.

[0092] Test the "Standby Stop" function on the HMI interface and use the "Reset" function in the control room or remote control location to restart. If there are no other faults, the methanol fuel supply unit 18 will immediately enter the "Main Process" process and directly enter the Operational Mode. This process jump eliminates the need for purge and leak test procedures, allowing the supply unit to directly enter the "Operational Mode" when there are no abnormal alarms. This allows the supply unit to directly intervene in the supply mode in the standby state, reducing the switching cycle and functional testing process. If a fault alarm is detected, the process jumps to the "Stop" interface. After the fault is eliminated, press "Reset" to reset the system, enter the purge mode and leak test mode, and then enter the main process supply mode.

[0093] In summary, the present invention shifts part of the entire commissioning cycle of the methanol fuel supply unit test to the dock mooring phase, reducing commissioning time during sea travel and saving costs. The methanol fuel supply device and commissioning method can significantly shorten the dock mooring test cycle, shortening the mooring period by 4-5 days and reducing expenses by approximately 20%. Therefore, the present invention effectively overcomes the shortcomings of the prior art and has high industrial application value.

[0094] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A methanol fuel liquid supply device, characterized in that: include: Methanol fuel tank, used to store methanol; The methanol fuel liquid supply unit includes a liquid inlet pipeline and a first control valve, a boost and pressure stabilizing assembly and a second control valve which are sequentially connected along the liquid inlet direction of the liquid inlet pipeline, wherein the liquid inlet pipeline is connected to the methanol fuel tank; the boost and pressure stabilizing assembly includes a first boosting device, an air pressure buffer device and a second boosting device in sequence along the liquid inlet direction.

2. The methanol fuel liquid supply device according to claim 1, characterized in that: The methanol fuel liquid supply unit also includes: a heat exchanger, disposed between the first boosting device and the air pressure buffer device; A filter is arranged between the second boosting device and the second control valve.

3. The methanol fuel liquid supply device according to claim 1, characterized in that: The methanol fuel liquid supply unit also includes: a temperature sensor, disposed between the first control valve and the boost and pressure stabilization component; The pressure sensor is arranged between the first control valve and the pressure boosting and stabilizing component.

4. The methanol fuel liquid supply device according to claim 2, characterized in that: The methanol fuel liquid supply device also includes: a fuel valve group delivery unit, connected to the liquid outlet end of the liquid inlet pipeline and connected to the air pressure buffer device; A gas user end connected to the fuel valve group delivery unit; A liquid return pipeline has one end connected to the gas user end and the other end connected to the methanol fuel tank.

5. The methanol fuel liquid supply device according to claim 4, characterized in that: The methanol fuel liquid supply device also includes: a gas-liquid separator connected to the methanol fuel tank and to the liquid return pipeline; a first nitrogen purge circuit, wherein the air inlet of the first nitrogen purge circuit is connected to the liquid outlet of the first booster device, and the nitrogen flows from the liquid outlet of the first booster device through the air pressure buffer device to the gas-liquid separator; a second nitrogen purge circuit, wherein the air inlet of the first nitrogen purge circuit is connected to the liquid outlet of the first boosting device, and nitrogen flows from the liquid outlet of the first boosting device through the air pressure buffer device and the second boosting device to the gas-liquid separator; The third nitrogen purge circuit is connected to the fuel valve group delivery unit and is connected to the liquid return pipeline through the fuel valve group delivery unit. The gas-liquid separator is connected to the liquid return pipeline.

6. The methanol fuel liquid supply device according to claim 1, characterized in that: The methanol fuel liquid supply unit also includes: A controller is control-connected to the boost and voltage stabilization component, the first control valve, and the second control valve.

7. A method for debugging a methanol fuel liquid supply device, characterized in that: The methanol fuel liquid supply device according to any one of claims 1 to 6 comprises: The methanol fuel liquid supply device on the ship is debugged during the mooring phase.

8. The method for debugging a methanol fuel liquid supply device according to claim 7, characterized in that: The steps for commissioning the methanol fuel liquid supply device in the ship during the mooring phase include: Close the first control valve and the second control valve, and perform nitrogen purge and nitrogen leakage test on the methanol fuel liquid supply unit in the methanol fuel liquid supply device; Open the first control valve and operate the first and second boosting devices. The first boosting device increases the pressure of the methanol to a first pressure value, and the second boosting device further increases the pressure of the methanol to a second pressure value after the pressure has been increased to the first pressure value. Keep the second control valve closed and test the variable frequency mode of the first and second boosting devices. In the closed operating state where the pipeline of the methanol fuel liquid supply unit is filled with methanol, operate the first and second boosting devices in a low-frequency mode. Under the action of the air pressure buffer device, maintain the pressure stable at the second pressure value. Open the second control valve, and methanol flows from the methanol fuel liquid supply unit to the fuel valve group delivery unit and enters the fuel user end.

9. The method for debugging a methanol fuel liquid supply device according to claim 8, characterized in that: After the second control valve is opened and methanol is delivered from the methanol fuel supply unit to the fuel valve group delivery unit and then to the fuel user end, the method further includes: While keeping the second control valve of the methanol fuel supply unit open, test the first and second boosting devices to run continuously for at least half an hour to ensure that no low pressure alarms or pump group failures occur.

10. The method for debugging a methanol fuel liquid supply device according to claim 9, characterized in that: After testing the first and second boosting devices for at least half an hour continuously while keeping the second control valve of the methanol fuel liquid supply unit open to ensure that no low pressure alarm or pump group failure occurs, the method further includes: When the methanol fuel liquid supply unit stops supplying liquid, the overall pressure of the methanol fuel liquid supply unit is gradually reduced, and the second control valve is closed.

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