A methanol fuel supply device and its commissioning method

Abstract

This invention discloses a methanol fuel supply device and its commissioning method. The methanol fuel supply device includes a methanol fuel tank and a methanol fuel supply unit. The methanol fuel tank stores methanol. The methanol fuel supply unit includes an inlet pipeline and, along the inlet direction of the inlet pipeline, a first control valve, a pressure boosting and stabilizing component, and a second control valve, all sequentially connected. The inlet pipeline is connected to the methanol fuel tank. The pressure boosting and stabilizing component, along the inlet direction, includes a first pressure boosting device, a pressure buffer device, and a second pressure boosting device. By incorporating the pressure boosting and stabilizing component, the methanol fuel supply device of this invention can quickly achieve a stable supply of methanol fuel, saving commissioning time. The commissioning method of this invention involves commissioning the methanol fuel supply device on a ship during the mooring phase. This method enables rapid commissioning, significantly reducing the dock mooring test cycle by 4-5 days, resulting in a cost reduction of up to approximately 20%.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, specifically to a methanol fuel supply device and its commissioning method. Background Technology

[0002] With technological advancements and energy diversification, marine fuels are no longer limited to light and heavy oil fuels. The development of green energy is driving the upgrading of alternative fuels such as liquefied natural gas and plant-based methanol, providing a priority option for reducing carbon emissions and promoting green travel. As technologies for the rational use of plant-based fuels are proposed and new fuel equipment technologies are continuously iterated, the industry is placing higher demands on the innovation of fuel-using equipment.

[0003] Combustion of hydrocarbon fuels presents disadvantages such as sulfur content, incomplete combustion leading to black smoke, and easy carbon deposition. Methanol fuel, due to its complete combustion, produces only water and carbon dioxide, making it more environmentally friendly and conducive to green travel. It is also cleaner and can be used at room temperature. Currently, the conditions for using methanol as fuel in ships are mature. However, existing ships only test their methanol fuel daily use systems during the sea trial phase, resulting in a lengthy testing period. How to achieve integrated testing of the methanol fuel daily use system during the dockside mooring phase before sea voyage, thus shortening the testing period, has become a pressing technical problem to be solved. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a methanol fuel supply device and commissioning method, which can be used to carry out project commissioning during the dock mooring stage, greatly saving the equipment commissioning cycle, and providing a reliable guarantee for predicting risks and saving the trial period during sea trials.

[0005] To achieve the above and other related objectives, the present invention provides a methanol fuel supply device, comprising:

[0006] Methanol fuel tank, used for storing methanol;

[0007] The methanol fuel supply unit includes an inlet pipeline and a first control valve, a pressure boosting and stabilizing assembly, and a second control valve that 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 stabilizing assembly includes a first pressure boosting device, a pressure buffer device, and a second pressure boosting device sequentially along the inlet direction.

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

[0009] A heat exchanger is installed between the first pressurization device and the air pressure buffer device;

[0010] A filter is installed between the second pressurization device and the second control valve.

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

[0012] A temperature sensor is located between the first control valve and the booster and regulator assembly;

[0013] A pressure sensor is located between the first control valve and the pressure boosting and stabilizing assembly.

[0014] Optionally, the methanol fuel supply unit also includes:

[0015] The fuel valve assembly delivery unit is connected to the outlet end of the inlet pipeline and to the pneumatic buffer device.

[0016] At the gas user end, it connects to the fuel valve assembly delivery unit;

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

[0018] Optionally, the methanol fuel supply unit also includes:

[0019] The gas-liquid separator is connected to the methanol fuel tank and the return liquid pipeline.

[0020] The first nitrogen purging circuit has its inlet connected to the liquid outlet of the first booster device. Nitrogen gas flows from the liquid outlet of the first booster device through the gas pressure buffer device to the gas-liquid separator.

[0021] The second nitrogen purging circuit connects the inlet of the first nitrogen purging circuit to the liquid outlet of the first pressurizing device. Nitrogen gas flows from the liquid outlet of the first pressurizing device through the pressure buffer device and the second pressurizing device to the gas-liquid separator.

[0022] The third nitrogen purging circuit is connected to the fuel valve group delivery unit and is connected to the return liquid pipeline via the fuel valve group delivery unit. The gas-liquid separator is connected to the return liquid pipeline.

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

[0024] The controller is connected to the booster and regulator assembly, the first control valve, and the second control valve.

[0025] This invention provides a commissioning method for a methanol fuel supply device, which employs the aforementioned methanol fuel supply device and includes:

[0026] The methanol fuel supply system on the ship was commissioned during the mooring phase.

[0027] Optionally, the steps of commissioning the methanol fuel supply system on board the ship during the mooring phase include:

[0028] Close the first and second control valves and perform nitrogen purging and nitrogen leakage tests on the methanol fuel supply unit in the methanol fuel supply device.

[0029] Open the first control valve, operate the first booster device and the second booster device. The first booster device increases the methanol pressure to the first pressure value, and the second booster device continues to boost the methanol pressure to the second pressure value.

[0030] Keep the second control valve closed and test the frequency conversion mode of the first and second booster devices. With the methanol fuel supply unit pipeline filled with methanol in a closed operating state, the first and second booster devices are operated in low frequency mode. Under the action of the air pressure buffer device, the pressure is kept stable at the second pressure value.

[0031] The second control valve is opened, and methanol is transported from the methanol fuel supply unit to the fuel valve assembly delivery unit and then to the fuel user end.

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

[0033] With the second control valve of the methanol fuel supply unit open, test the first and second booster units to run continuously for at least half an hour to ensure that there are no low-pressure alarms or pump unit failures.

[0034] Optionally, after testing the continuous operation of the first and second booster units for at least half an hour while keeping the second control valve of the methanol fuel supply unit open, and ensuring that no low-pressure alarm or pump failure occurs, the process further includes:

[0035] When stopping the methanol fuel supply unit, gradually reduce the overall pressure of the methanol fuel supply unit and close the second control valve.

[0036] Compared with the prior art, the methanol fuel supply device and commissioning 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 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 stabilizing component, 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 stabilizing component includes a first pressure boosting device, a pressure buffer device, and a second pressure boosting device, sequentially along the inlet direction. By incorporating the pressure boosting and stabilizing component, the methanol fuel supply device of the present invention can quickly achieve a stable supply of methanol fuel, saving commissioning time.

[0038] The commissioning method for the methanol fuel supply device of the present invention includes commissioning the methanol fuel supply device on the ship during the mooring phase, which can reduce the test and commissioning time during sea voyages and save test costs. The commissioning method adopted enables rapid commissioning, greatly shortening the dock mooring test cycle by 4 to 5 days, resulting in a cost reduction of up to 20%. Attached Figure Description

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

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

[0041] List of reference numerals in the attached diagram:

[0042] 1. Methanol fuel tank

[0043] 2. Liquid inlet pipeline

[0044] 3 First control valve

[0045] 4 First booster unit

[0046] 5. Air pressure buffer device

[0047] 6 Second booster unit

[0048] 7. Heat Exchanger

[0049] 8 Filters

[0050] 9 Second control valve

[0051] 10 Controllers

[0052] 101 PLC Touch Screen

[0053] 11 Fuel Valve Assembly Delivery Unit

[0054] 12 Nitrogen storage device

[0055] 13 Fuel User End

[0056] 14 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 Implementation

[0063] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0064] It should be understood that the illustrations provided in the embodiments of this invention are merely schematic representations of the basic concept of the invention. Although the illustrations only show components relevant to the invention and are not drawn according to the actual number, shape, and size of components in implementation, the shape, quantity, and proportion of each component can be arbitrarily changed in actual implementation, and the component layout may also be more complex. The structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the invention can produce, should still fall within the scope of the technical content disclosed in this application.

[0065] Example 1

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

[0067] The methanol fuel tank 1 is used to store methanol. The methanol fuel supply unit 18 includes an inlet pipe 2 and a first control valve 3, a pressure boosting and stabilizing assembly, and a second control valve 9 arranged along the inlet direction of the inlet pipe 2. The inlet pipe 2 is connected to the methanol fuel tank 1 and includes an inlet end and an outlet end. The first control valve 3 is located at the inlet end of the inlet pipe 2 and is connected to the inlet pipe 2. Along the direction from the inlet end to the outlet end, the pressure boosting and stabilizing assembly is located after the first control valve 3 and is connected to the inlet pipe 2. The pressure boosting and stabilizing assembly includes a first pressure boosting device 4, a pressure buffer device 5, and a second pressure boosting device 6. The first pressure boosting device 4 is connected to the first control valve 3, the pressure buffer device 5 is connected to the first pressure boosting device 4, and the second pressure boosting device 6 is connected to the pressure buffer device 5. The first pressurizing device 4 pressurizes the methanol entering the inlet pipe 2 to a first pressure value. The pressure buffer device 5 buffers this pressure value before it enters the second pressurizing device 6, which 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 pressure buffer device 5 is a buffer collection tank, and the second pressurizing device 6 is a booster pump. The second control valve 9 is located on the inlet pipe 2 and downstream of the second pressurizing device 6.

[0068] Optionally, a temperature sensor 19 and a pressure sensor 20 are also provided between the first control valve 3 and the pressurization and stabilization assembly to detect the pressure and temperature of the methanol entering the system. Optionally, a heat exchanger 7 is provided between the first pressurization device 4 and the pressure buffer device 5. 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, controlling the methanol temperature range within 10-35°C before entering the machine, which is easier to manage and implement than cryogenic liquefied LNG. A filter 8 is also provided after the pressurization and stabilization assembly along the direction from the inlet to the outlet. The filter 8 is used to filter the methanol entering the system. In this embodiment, the heat exchanger 7 is an ethylene glycol heat exchanger, and the filter 8 is a dual filter.

[0069] The methanol fuel supply unit 18 also includes a controller 10, which is connected to the booster and pressure stabilizing assembly, the first control valve 3, and the second control valve 9 to control the opening and closing of the first control valve 3 and the second control valve 9, as well as the start-up and mode switching of the booster device in the booster and pressure stabilizing assembly. Optionally, the controller 10 is also connected to a temperature sensor 19 and a pressure sensor 20. Optionally, the controller 10 is an electrical control function box, which is equipped with a PLC touch screen 101 to facilitate human-machine interface operation and management. The electrical control function box establishes a human-machine interface interaction mode through various sensors. Signals are sent from the PLC touch screen 101 and the sensors to the electrical control function box, and through module logic control, the automatic operation of the methanol fuel supply unit's supply pump and booster pump, and the adjustment of various control valves, etc., are established.

[0070] Optionally, the methanol fuel supply unit also includes a support frame 17. The methanol fuel supply unit 18 is integrated on the support frame 17 in a skid-mounted design. The support frame 17 serves to support all methanol unit equipment and facilitates modular integration of the system equipment. All components within the methanol fuel supply unit 18 are connected using stainless steel flanges. The inlet pipe 2 is a double-walled pipe. The inner wall of the double-walled pipe (stainless steel) supplies the methanol working medium, and the outer wall is also made of stainless steel. Air is filled between the inner and outer pipes to detect any methanol leaks and trigger an alarm if a leak occurs.

[0071] Optionally, the methanol fuel supply device further includes a fuel valve assembly delivery unit 11, a fuel user terminal 13, and a return pipeline 14. The fuel valve assembly delivery unit 11 is connected to the outlet end of the inlet pipeline 2 to receive methanol supplied from the methanol fuel supply unit 18. The fuel valve assembly delivery unit 11 is also connected to a pressure buffer device 5, which recirculates excess methanol fuel when it exists. The fuel valve assembly delivery unit 11 is also communicatively connected to a security system that can stop methanol supply in case of malfunction or alarm. The fuel user terminal 13 is connected to the fuel valve assembly delivery unit 11 to receive methanol fuel supplied by it. One end of the return pipeline 14 is connected to the gas user terminal, and the other end is connected to the methanol fuel tank 1, allowing any remaining methanol from the fuel user terminal 13 to be returned to the methanol fuel tank 1.

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

[0073] The methanol fuel supply device also includes a third nitrogen purging circuit. The nitrogen storage device 12 is connected to the fuel valve assembly delivery unit 11 and, via the fuel valve assembly delivery unit 11, to the return liquid line 14. This nitrogen purging circuit is used to purge the methanol accumulated in the fuel valve assembly delivery unit 11. The purged nitrogen and methanol mixture then flows through the return liquid line 14 to the gas-liquid separator 15, which separates the nitrogen-methanol mixture purged through the return liquid line 14. Optionally, the methanol fuel supply device also includes a flow control line, which connects to the gas-liquid separator 15 from the outlet of the first booster device 4. This flow control line is equipped with a third control valve 16, which can divert fluid from the inlet pipe 2 when the flow rate is too high and replenish fluid from the inlet pipe 2 when the flow rate is too low. Optionally, the first control valve 3, the second control valve 9, and the third control valve 16 are all pneumatic control valves. Pneumatic control is used to facilitate automatic switching control. The pneumatic control valves adopt an instrument air supply opening mode and automatically lock in the air-off mode to protect production safety.

[0074] In this embodiment, the methanol medium inside the methanol fuel supply device flows from the methanol fuel tank 1 through the inlet pipe 2 to the first control valve 3, then flows into the first pressurization device 4 to be pressurized to a first pressure value, and then enters the pressure buffer device 5 to flow to the second pressurization device 6, where it is pressurized to a second pressure value. After passing through the first pressurization device 4, before flowing to the pressure buffer device 5, the fluid undergoes temperature control via the heat exchanger 7 to achieve a stable state under the required temperature control. In this embodiment, the heat exchanger 7 is a water-ethylene glycol heat exchanger 7, in which the circulating hot water ethylene glycol is kept in thermal equilibrium by a low-temperature water plate. After passing through the second pressurization device 6, it is further filtered by the filter 8. It then flows to the second control valve 9 and then to the fuel valve assembly delivery unit 11 before entering the gas user end. Excess fuel in the fuel valve assembly delivery unit 11 is returned to the pressure buffer device 5 to stabilize pressure and buffer, preventing sudden pressure failures. The remaining methanol at the gas user end flows back to the methanol fuel tank 1 through the return pipe 14.

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

[0076] Example 2

[0077] This embodiment provides a methanol fuel commissioning method, which uses the methanol fuel supply device described in Embodiment 1 above. The method includes assembling methanol fuel supply modules to form a methanol fuel supply device, and commissioning the methanol fuel supply device during the mooring phase.

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

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

[0080] Before nitrogen purging, preparatory work is carried out. Methanol is added in place, and all valves in the relevant methanol fuel system are in operation to ensure normal methanol flow. The relevant pneumatic control valves are connected to the instrument air system, and the safety system establishes communication with the fuel valve group delivery unit 11, which can be operated via touch screen on the human-machine interface.

[0081] The methanol fuel supply unit installation and verification were completed. After the external double-walled pipe and methanol fuel tank 1 were filled, initial commissioning was performed. Upon powering on, in the HMI (Human Machine Interface) state, the communication status of each control valve position was checked on the PLC touchscreen 101, especially the corresponding pneumatic control valves for any abnormalities. If a red "Error" alarm appeared on the interface, the wiring needed to be disconnected and checked according to the internal wiring diagram, using a multimeter to check the communication with the corresponding wire numbers. If the communication was normal, the mechanical limit switch action of the corresponding valve position controller was checked for any abnormalities. The valve position action could be operated via the emergency manual switch on the valve position controller. For the "Open" position, visually check if the mechanical valve position travel had moved to the open position; conversely, for the "Close" position, check if the mechanical valve position travel had moved to the closed position. After confirming the correct valve position opening on the HMI, an emergency stop signal was simulated for a safety test. After inputting an ESD emergency stop, the HMI displayed that all pumps had stopped running and all other pneumatic valves had turned to the "Fault" position. Press the reset button to return to the stop interface. Manually press the "Emergency Stop" button on the HMI to check that all pumps in the HMI have stopped running and all pneumatic valves have turned to the "Fault" position.

[0082] A purging test is performed on the HMI (Human Machine Interface). The test checks that the first control valve 3 and the second control valve 9 at each inlet and outlet of the fuel system are closed, the purging flow returns to the buffer collection cabinet and methanol fuel tank 1, and the system interface shows that it is isolated from the fuel tank and the gas user end. The purging process purges the medium remaining in the methanol fuel supply unit 18 pipeline, flows through the fuel user and returns to the methanol fuel tank. During the test, if there are no other related alarms on the interface, the system process will jump to STARTUP to start up and proceed to the next step. If an alarm pops up, the maintenance process "Maintenance" is highlighted, indicating that the items need to be inspected or disassembled, and the process returns to the purging process, resulting in an infinite loop in the system process.

[0083] To perform a nitrogen leak test on the HMI (Human Machine Interface), while maintaining methanol fuel inside the unit piping system, manually press the "Nitrogen Leak Test" button on the HMI interface. The purpose of the test is to check for leaks in the double-walled pipe from the fuel tank to the liquid supply unit. If the HMI system self-checks and finds no related leak alarms, the process will continue and display "Leak Test Completed." The system process will then jump out of the "Startup Process" to prepare for startup.

[0084] S2: Open the first control valve 3, operate the first booster device 4 and the second booster device 6. The first booster device 4 increases the methanol pressure to the first pressure value, and the second booster device 6 continues to boost the methanol pressure to the second pressure value.

[0085] Perform a startup preparation test in the HMI (Human Machine Interface). After the system leak test is completed and the nitrogen purging process is finished, exit the startup preparation phase. Open the first control valve 3. Set the supply pump and booster pump HMI to the "Manual" position and manually start the supply pump and booster pump. Simultaneously check the pump rotation direction and system pipeline pressure increase. After pressurization by the supply pump, the pressure value reaches 3-4 Bar, which is the first pressure value. After pressurization by the booster pump, the pressure value reaches 8-9 Bar, which is the second pressure value. Visually inspect the pressure at the outlet pressure display of methanol fuel supply unit 18 to ensure it reaches 8-9 Bar.

[0086] S3: Keep the second control valve 9 closed, test the frequency conversion mode of the first booster device 4 and the second booster device 6. In the closed operation state where the pipeline of the methanol fuel supply unit 18 is filled with methanol, the first booster device 4 and the second booster device 6 are operated in 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 booster pump. With the methanol fuel supply unit 18 filled with methanol fluid in a closed operating state, operate in low frequency mode and keep the outlet pressure of the methanol fuel supply unit 18 at 8-9 Bar. It can immediately provide a stable 8-9 Bar methanol supply to the fuel user upon receiving operating instructions from the fuel user and the central control room.

[0088] S4: Open the second control valve 9, and methanol is delivered from the methanol fuel supply unit 18 to the fuel valve group delivery unit 11 and then to the fuel user terminal 13.

[0089] The "Main Process" function was tested in the HMI interface. The function test was conducted by adjusting the valve position control in the previous test. The methanol fuel supply unit 18 outlet valve (second control valve 9) was adjusted to open automatically under the process control, so that the methanol fluid entered the fuel valve group delivery unit 11 and entered the host / generator user (fuel user end 13), and the pressure could be stabilized in a short time.

[0090] Test the "Run" function in the HMI interface. Keep the liquid supply unit outlet valve in automatic open mode and test the continuous operation of the supply pump and booster pump for more than half an hour. If there is no low pressure alarm or pump group failure, it is acceptable.

[0091] When testing the "Stop" function on the HMI interface, after manually pressing the "Stop" button, the program stops the operation of the supply pump and the booster pump. The liquid supply unit can smoothly stop supplying liquid to the host / generator user, gradually reducing the overall pressure of the system piping. The second control valve 9 closes, isolating the methanol fuel supply unit 18 from the fuel valve group delivery unit 11.

[0092] The "standby stop" function was tested on the HMI interface, and the "reset" restart function was used in the central control room and remote control location. If no other faults were detected, the methanol fuel supply unit 18 immediately entered the "main process" and directly entered the operating mode. This process jump eliminates the need for purging and leak testing, allowing the supply unit to directly enter "operating" mode without any abnormal alarms. This allows for direct intervention in the supply mode from standby status, reducing switching cycles and functional testing procedures. If a fault alarm occurs, the process jumps to the "stop" interface. After troubleshooting, pressing "reset" resets the unit, entering purging and leak testing modes, followed by the main process supply mode.

[0093] In summary, this invention can shift part of the entire commissioning cycle of the methanol fuel supply unit test to the dock mooring stage, reducing commissioning time during sea voyages and saving costs. The methanol fuel supply device and commissioning method can significantly shorten the dock mooring test cycle, reducing the mooring period by 4-5 days and reducing expenses by up to approximately 20%. Therefore, this invention effectively overcomes the various shortcomings of existing technologies 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 invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A methanol fuel supply device, characterized in that, include: Methanol fuel tank, used for storing methanol; A methanol fuel supply unit includes an inlet pipeline and a first control valve, a pressure boosting and stabilizing assembly, and a second control valve that 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 stabilizing assembly includes a first pressure boosting device, a pressure buffer device, and a second pressure boosting device sequentially along the inlet direction. A heat exchanger is disposed between the first pressurizing device and the air pressure buffer device; A filter is disposed between the second pressurizing device and the second control valve; The fuel valve assembly delivery unit is connected to the outlet end of the liquid inlet pipeline and to the pneumatic buffer device. The gas user terminal is connected to the fuel valve assembly delivery unit. The return pipeline is connected at one end to the gas user terminal and at the other end to the methanol fuel tank. A gas-liquid separator is connected to the methanol fuel tank and to the return liquid pipeline; The first nitrogen purging circuit has its inlet connected to the liquid outlet of the first pressurizing device. Nitrogen gas flows from the liquid outlet of the first pressurizing device through the pressure buffer device to the gas-liquid separator. The second nitrogen purging circuit has an inlet connected to the liquid outlet of the first pressurizing device. Nitrogen gas flows from the liquid outlet of the first pressurizing device through the pressure buffer device and the second pressurizing device to the gas-liquid separator. The third nitrogen purging circuit is connected to the fuel valve group delivery unit and is connected to the return liquid pipeline via the fuel valve group delivery unit. The gas-liquid separator is connected to the return liquid pipeline.

2. The methanol fuel supply device according to claim 1, characterized in that, The methanol fuel supply unit also includes: A temperature sensor is disposed between the first control valve and the pressure boosting and stabilizing assembly; A pressure sensor is located between the first control valve and the pressure boosting and stabilizing assembly.

3. The methanol fuel supply device according to claim 1, characterized in that, The methanol fuel supply unit also includes: The controller is connected to the booster and regulator assembly, the first control valve, and the second control valve.

4. A commissioning method for a methanol fuel supply device, characterized in that, The methanol fuel supply device according to any one of claims 1 to 3 comprises: The methanol fuel supply system on the ship was commissioned during the mooring phase.

5. The commissioning method for the methanol fuel supply device according to claim 4, characterized in that, The steps for commissioning the methanol fuel supply system on board a ship during the mooring phase include: Close the first control valve and the second control valve, and perform nitrogen purging and nitrogen leakage test on the methanol fuel supply unit in the methanol fuel supply device. Open the first control valve, operate the first booster device and the second booster device. The first booster device increases the methanol pressure to the first pressure value, and the second booster device continues to boost the methanol pressure to the second pressure value. Keep the second control valve closed and test the frequency conversion mode of the first and second booster devices. With the methanol fuel supply unit pipeline filled with methanol in a closed operating state, the first and second booster devices are operated in low frequency mode. Under the action of the air pressure buffer device, the pressure is kept stable at the second pressure value. The second control valve is opened, and methanol is transported from the methanol fuel supply unit to the fuel valve assembly delivery unit and then to the fuel user end.

6. The commissioning method for the methanol fuel supply device according to claim 5, characterized in that, After the second control valve is opened, allowing methanol to flow from the methanol fuel supply unit to the fuel valve assembly delivery unit and then to the fuel user, the process further includes: With the second control valve of the methanol fuel supply unit open, test the first and second booster units to run continuously for at least half an hour to ensure that there are no low-pressure alarms or pump unit failures.

7. The commissioning method for the methanol fuel supply device according to claim 6, characterized in that, After ensuring that the second control valve of the methanol fuel supply unit is open, and after testing the first and second booster units continuously for at least half an hour to ensure no low-pressure alarms or pump malfunctions occur, the following steps are also included: When stopping the methanol fuel supply unit, gradually reduce the overall pressure of the methanol fuel supply unit and close the second control valve.

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