Marine clean fuel supply system and method of controlling the same

Abstract

The present application provides a kind of marine clean fuel supply system and its control method, for transporting liquid clean fuel in storage tank to ship power device, it includes fuel pressurizing pump, buffer constant pressure tank and auxiliary pressurizing device;Fuel pressurizing pump communicates storage tank to pressurize liquid clean fuel;Buffer constant pressure tank is communicated with fuel pressurizing pump, to accommodate pressurized liquid clean fuel;Auxiliary pressurizing device communicates protective gas source and buffer constant pressure tank, to pressurize protective gas in protective gas source and input buffer constant pressure tank, to maintain the pressure stability in buffer constant pressure tank;When liquid clean fuel is input to buffer constant pressure tank, under the action of auxiliary pressurizing device, to continuously apply stable pressure to the liquid clean fuel in the buffer constant pressure tank, and make the liquid clean fuel in buffer constant pressure tank stable, continuously output to ship power device, to guarantee fuel full combustion, ship power device kinetic energy is sufficient.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a marine clean fuel supply system and its control method. Background Technology

[0002] With growing global environmental awareness, the International Maritime Organization (IMO) has updated its sulfur cap regulations multiple times. Since 2020, the sulfur content of ship fuels must be below 0.05%. Furthermore, the promulgation of increasingly stringent environmental protection regulations has promoted the use of a range of clean fuels such as methanol, ethanol, and LNG.

[0003] my country's methanol production accounts for over 60% of global capacity. Compared to other clean fuels, methanol offers numerous advantages, including being clean, environmentally friendly, and readily available. Methanol is liquid at room temperature and pressure and is incompressible. Even when pressurized, methanol will rapidly depressurize once it begins to flow, making it unsustainable. Most ship propulsion systems require methanol to maintain a certain pressure; otherwise, the propulsion system will lack sufficient power, and fuel will not be able to be injected into the cylinders for combustion. Summary of the Invention

[0004] The purpose of this application is to provide a marine clean fuel supply system and control method that can stably supply pressurized methanol fuel.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] According to one aspect of this application, a marine clean fuel supply system is provided for delivering liquid clean fuel from a storage tank to a ship's power plant. The system includes a fuel pressurization pump, a buffer pressure stabilizing tank, and an auxiliary pressurization device. The fuel pressurization pump is connected to the storage tank to pressurize the liquid clean fuel. The buffer pressure stabilizing tank is connected to the fuel pressurization pump to contain the pressurized liquid clean fuel. The auxiliary pressurization device is connected to an external protective gas source and the buffer pressure stabilizing tank. The auxiliary pressurization device pressurizes the protective gas in the protective gas source and inputs it into the buffer pressure stabilizing tank to maintain stable pressure within the buffer pressure stabilizing tank. Under the action of the auxiliary pressurization device, the liquid clean fuel in the buffer pressure stabilizing tank is continuously output to the ship's power plant.

[0007] In some embodiments, the buffer pressure stabilizing tank is provided with a plurality of liquid level sensors, which are arranged sequentially along the vertical direction of the buffer pressure stabilizing tank. The liquid level sensors are used to collect liquid level information in the buffer pressure stabilizing tank, and the fuel pressurization pump is turned on or off according to the liquid level information.

[0008] In some embodiments, a pressure sensor is also included, which is located on the buffer pressure stabilizing tank. The pressure sensor is used to collect pressure information in the buffer pressure stabilizing tank. When the liquid level reaches the liquid level specified by the liquid level sensor, the pressure preset value corresponding to each liquid level is compared to determine whether the auxiliary pressurization device is turned on or off.

[0009] In some embodiments, the device further includes a temperature regulating device and a temperature sensor. The temperature regulating device is disposed at the output end of the buffer pressure stabilizing tank to regulate the temperature of the liquid clean fuel output from the buffer pressure stabilizing tank. The temperature sensor is disposed on the buffer pressure stabilizing tank to collect temperature information inside the buffer pressure stabilizing tank. The temperature regulating device adjusts the temperature according to the temperature sensor.

[0010] In some embodiments, the output end of the buffer pressure tank is provided with two parallel temperature regulating pipelines, and the liquid clean fuel in the buffer pressure tank can be input to the ship's power unit through the two temperature regulating pipelines respectively; the temperature regulating device includes a radiator and a heater, and the radiator and the heater are respectively provided on the two temperature regulating pipelines so as to adjust the temperature of the liquid clean fuel input to the ship's power unit respectively.

[0011] In some embodiments, a pressure regulating valve is provided between the temperature regulating device and the ship's power unit to reduce and stabilize the pressure of the liquid clean fuel to the pressure required by the ship's power unit.

[0012] In some embodiments, a flow meter is provided at the output end of the pressure regulating valve. The flow meter is used to collect the flow rate of the liquid clean fuel output by the pressure regulating valve. The fuel pressurizing pump is a variable frequency pump, and the fuel pressurizing pump is frequency-adjusted according to the flow meter.

[0013] In some embodiments, there are multiple pressure regulating valves and multiple fuel pressurizing pumps, with the multiple pressure regulating valves and multiple fuel pressurizing pumps arranged in parallel.

[0014] In some embodiments, a protective gas purging device is further included. The protective gas purging device includes a first purging line, a second purging line, and a venting line. One end of the first purging line is connected to the protective gas source, and the other end of the first purging line is connected to the input end of the fuel pressurizing pump. The other end of the second purging line is connected to the output end of the pressure regulating valve. One end of the venting line is connected to the output end of the pressure regulating valve, and the other end of the venting line is connected to the storage tank. The protective gas purging device can clean the liquid clean fuel in the fuel pressurizing pump, the buffer pressure stabilizing tank, the temperature regulating device, and the pressure regulating valve and return it to the storage tank.

[0015] A control method for a marine clean fuel supply system, applied to any of the marine clean fuel supply systems described above, includes the following steps: The fuel pressurizing pump and the auxiliary pressurizing device are started simultaneously. The liquid clean fuel in the storage tank is pressurized by the fuel pressurizing pump and then input into the buffer pressure stabilizing tank. The protective gas in the protective gas source is input into the buffer pressure stabilizing tank through the auxiliary pressurizing device, so that the liquid clean fuel in the buffer pressure stabilizing tank is kept under high pressure under the action of the protective gas. The liquid clean fuel in the buffer pressure tank can be continuously output to the ship's power unit under pressure, so as to continuously provide the ship's power unit with liquid clean fuel with stable pressure.

[0016] In some embodiments, the buffer pressure stabilizing tank further includes the liquid level sensor and the pressure sensor. The buffer pressure stabilizing tank is provided with a first liquid level, a second liquid level, and a third liquid level from bottom to top. The pressure sensor is used to detect the pressure of the buffer pressure stabilizing tank. When the liquid clean fuel exceeds the first liquid level, the liquid clean fuel in the buffer pressure stabilizing tank can be output to the ship's power unit. The fuel pressurizing pump and the auxiliary pressurizing device are started simultaneously. The liquid level of the liquid clean fuel successively exceeds the first liquid level and the second liquid level. When it reaches the third liquid level, the fuel pressurizing pump is stopped. When the pressure reaches the preset pressure value corresponding to the third liquid level, the auxiliary pressurizing device is stopped. The liquid clean fuel in the buffer pressure tank can be continuously supplied to the ship's power unit. When the liquid level of the liquid clean fuel drops from the third level to the second level, and the pressure detected by the pressure sensor is less than the preset pressure value corresponding to the second level, the fuel pressurization pump and the auxiliary pressurization device start to make the pressure in the buffer pressure tank greater than the preset pressure value corresponding to the second level.

[0017] In some embodiments, the system further includes the pressure regulating valve and the flow meter. The pressure regulating valve reduces the pressure of the liquid clean fuel output from the buffer pressure stabilizing tank and then outputs it to the ship's power unit. The flow meter collects the flow rate value output by the pressure regulating valve and can adjust the power of the fuel pressurization pump according to the flow rate value of the liquid clean fuel required by the ship's power unit and the flow rate value output by the pressure regulating valve.

[0018] In some embodiments, the temperature sensor is provided on the buffer pressure tank, and the marine clean fuel supply system includes the radiator and the heater, with a cooling fan provided on the radiator. When the temperature inside the buffer pressure tank is less than 25°C, the liquid clean fuel is processed by the heater and then output to the ship's power unit. When the temperature is greater than 48°C, the liquid clean fuel is processed by the radiator and then output to the ship's power unit, at which time the cooling fan is turned on. When the temperature inside the buffer pressure tank is between 25°C and 48°C, the liquid clean fuel is processed by the radiator, and the cooling fan is turned off.

[0019] As can be seen from the above technical solution, this application has at least the following advantages and positive effects: In this application, when the ship starts, the fuel pressurization pump is turned on, pressurizing the liquid clean fuel in the storage tank and then inputting it into the buffer pressure stabilizing tank. While the liquid clean fuel is being input into the buffer pressure stabilizing tank, an auxiliary pressurization device is activated to input high-pressure protective gas into the buffer pressure stabilizing tank, thereby continuously applying a stable pressure to the liquid clean fuel in the buffer pressure stabilizing tank and ensuring a stable and continuous output of the liquid clean fuel from the buffer pressure stabilizing tank to the ship's power plant, thus guaranteeing complete fuel combustion and sufficient kinetic energy for the ship's power plant. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the marine clean fuel supply system of the present invention.

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of the intermediate buffer pressure stabilizing tank.

[0022] Figure 3 This is a flowchart illustrating the control method of the marine clean fuel supply system of the present invention.

[0023] Figure 4 This is a flowchart illustrating the control method S201 of the present invention.

[0024] Figure 5 This is a flowchart illustrating the control methods S301-S303 of the present invention.

[0025] Figure 6 This is a flowchart illustrating the control method S400-S500 of the present invention.

[0026] The annotations in the attached figures are explained as follows: 10. Protective gas source; 20. Storage tank; 30. Ship's power plant; 100. Fuel pressurization pump; 200. Buffer and pressure stabilizing tank; 210. Liquid level sensor; 220. Pressure sensor; 230. Temperature sensor; 240. Venting device; 250. Tank return pipe; 300. Auxiliary pressurization device; 400. Temperature control device; 410. Radiator; 411. Cooling fan; 420. Heater; 500. Pressure regulating valve; 610. Pressure gauge; 620. Bypass valve; 630. Flow meter; 710. Clean fuel filter; 720. Pressure regulating valve filter; 810. First purging line; 820. Second purging line; 830. Drain line. Detailed Implementation

[0027] Typical embodiments embodying the features and advantages of this application will be described in detail in the following description. It should be understood that this application can have various variations in different embodiments, all of which do not depart from the scope of this application, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this application.

[0028] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] The liquid clean fuels described in this application are clean fuels that are in a liquid state at normal temperature and pressure, including methanol, ethanol, etc. The normal temperature mentioned herein is 0℃~30℃, and the normal pressure is one standard atmosphere.

[0030] Methanol is a liquid at room temperature and pressure, while most methanol-powered ship propulsion systems require methanol to be under pressure. However, liquid methanol is not compressible, so even if it is pressurized, it will rapidly lose pressure once it begins to flow, making it impossible to stably maintain pressurized methanol. This results in unstable methanol combustion in the ship's propulsion system, leading to insufficient power output.

[0031] The protective gas described in this application is an inert gas that is insoluble in the aforementioned liquid clean fuels. Protective gases include nitrogen, etc.

[0032] Figure 1 This is a schematic diagram of the marine clean fuel supply system of the present invention.

[0033] See Figure 1 This application provides a marine clean fuel supply system that pressurizes the liquid clean fuel in the storage tank 20 and delivers it stably and efficiently to the ship's power unit 30, so that the pressurized liquid clean fuel can be fully combusted in the ship's power unit 30, thereby ensuring that the ship's power unit 30 has sufficient power.

[0034] The marine clean fuel supply system includes a fuel pressurization pump 100, a buffer pressure tank 200, and an auxiliary pressurization device 300. The input end of the fuel pressurization pump 100 is connected to the storage tank 20, and the output end of the fuel pressurization pump 100 is connected to the input end of the buffer pressure tank 200. The output end of the buffer pressure tank 200 is connected to the ship's power plant 30. The auxiliary pressurization device 300 is connected to an external protective gas source 10 and the buffer pressure tank 200 to pressurize the protective gas in the protective gas source 10 and then input it into the buffer pressure tank 200. The fuel pressurization pump 100 pressurizes the liquid clean fuel in the storage tank 20 and inputs it into the buffer pressure tank 200, while the auxiliary pressurization device 300 pressurizes the protective gas in the protective gas source 10 and inputs it into the buffer pressure tank 200 to maintain a stable pressure within the buffer pressure tank 200. The pressure within the buffer pressure tank 200 ensures that the liquid clean fuel is under pressurization and continuously supplied to the ship's power plant 30. Liquid clean fuel enters the ship's power unit 30 under pressure and is fully dispersed after entering the ship's power unit 30, which increases the air-fuel ratio of the ship's power unit 30 and increases the combustion efficiency of the clean fuel, so that the ship's power unit 30 provides sufficient power.

[0035] In this embodiment, multiple fuel pressurization pumps 100 are connected in parallel. The input ends of each fuel pressurization pump 100 are connected to the storage tank 20, and the output ends of each fuel pressurization pump 100 are connected to the buffer pressure stabilizing tank 200. The multiple fuel pressurization pumps 100 operate in a multi-standby configuration, thereby ensuring the safety and reliability of the marine clean fuel supply system and facilitating the maintenance and replacement of the fuel pressurization pumps 100. In some embodiments, two fuel pressurization pumps 100 are used, with one as a standby pump and the other as the active pump.

[0036] The fuel pressurization pump 100 is a variable frequency pump. The fuel pressurization pump 100 changes its output frequency according to the needs of the ship's power plant 30, so as to meet the different pressure and flow requirements of the ship's power plant 30 for liquid clean fuel.

[0037] In other embodiments, each fuel pressurization pump 100 is provided with a pneumatic valve at its input end for controlling the operation of the corresponding fuel pressurization pump 100. Each fuel pressurization pump 100 is provided with a check valve at its output end to prevent liquid clean fuel in the buffer pressure tank 200 from flowing back into the fuel pressurization pump 100.

[0038] Figure 2 yes Figure 1 A schematic diagram of the structure of the intermediate buffer pressure stabilizing tank.

[0039] See Figure 1 and Figure 2 In this embodiment, the buffer pressure stabilizing tank 200 is used to contain the liquid clean fuel pressurized by the fuel pressurizing pump 100 and the protective gas pressurized by the auxiliary pressurizing device 300. The protective gas continuously applies pressure to the liquid clean fuel within the buffer pressure stabilizing tank 200, and maintains the pressure of the liquid clean fuel while it is being output to the ship's power plant 30 through the output end of the buffer pressure stabilizing tank 200, thus keeping the liquid clean fuel under pressure and facilitating complete combustion of the liquid clean fuel by the ship's power plant 30.

[0040] Multiple liquid level sensors 210 are installed on the buffer pressure stabilizing tank 200. The multiple liquid level sensors 210 are arranged sequentially along the vertical direction of the buffer pressure stabilizing tank 200. The liquid level sensors 210 are used to collect liquid level information in the buffer pressure stabilizing tank 200. The fuel pressurizing pump 100 and the auxiliary pressurizing device 300 are turned on or off according to the liquid level information.

[0041] In some embodiments, there are three level sensors 210 arranged sequentially from bottom to top to detect the first, second, and third liquid levels of the buffer pressure tank 200. When the fuel pressurization pump 100 inputs liquid clean fuel into the buffer pressure tank 200, the liquid level of the clean fuel rises, triggering the three level sensors 210 as they pass through the first, second, and third liquid levels respectively.

[0042] When the first liquid level sensor 210 is triggered, liquid clean fuel can be output to the ship's power unit 30 through the output terminal of the buffer pressure tank 200, so that the ship's power unit 30 can operate. When the third liquid level sensor 210 is triggered, the fuel pressurization pump 100 stops working to prevent the liquid clean fuel level from exceeding the third liquid level.

[0043] In this embodiment, a pressure sensor 220 is provided on the buffer pressure stabilizing tank 200. The pressure sensor 220 is used to collect the pressure information in the buffer pressure stabilizing tank 200 in real time. When the liquid level reaches the liquid level specified by the liquid level sensor 210, the pressure preset value corresponding to each liquid level is compared to determine whether the auxiliary pressurizing device 300 is turned on or off, so as to ensure that the pressure value in the buffer pressure stabilizing tank 200 is maintained within the preset range.

[0044] In some embodiments, after the marine clean fuel supply system is started, when the liquid level in the buffer pressure tank 200 drops from the third liquid level to the second liquid level, the pressure in the buffer pressure tank 200 needs to be maintained at a preset pressure value corresponding to the second liquid level. In other embodiments, the preset pressure value corresponding to the second liquid level is 1.8 MPa. In other embodiments, the pressure in the buffer pressure tank 200 is maintained between 1.8 MPa and 2.5 MPa. In other embodiments, the pressure range of the buffer pressure tank 200 can be changed according to the needs of the ship's propulsion unit 30, so that the marine clean fuel supply system can meet the needs of different types of ship propulsion units 30, thus expanding the applicability of the marine clean fuel supply system.

[0045] In other embodiments, the first liquid level, the second liquid level, and the third liquid level are each provided with a pressure preset value, so that the auxiliary pressurization device 300 and the fuel pressurization pump 100 can be turned on or off based on the collected liquid level information and pressure information.

[0046] In this embodiment, a temperature sensor 230 is also provided on the buffer pressure stabilizing tank 200. The temperature sensor 230 is used to collect temperature information inside the buffer pressure stabilizing tank 200.

[0047] During actual use of a ship, the required temperature of clean fuel varies depending on the different power plants 30. Therefore, the marine clean fuel supply system can adjust the temperature of the liquid clean fuel output to the power plants 30 based on the temperature information collected by the temperature sensor 230, in order to meet the needs of different power plants 30.

[0048] In this embodiment, a venting device 240 is also provided inside the buffer pressure stabilizing tank 200. The venting device 240 is connected to the upper part of the buffer pressure stabilizing tank 200 to vent the protective gas inside the buffer pressure stabilizing tank 200. In some embodiments, the venting device 240 includes a venting pipe. One end of the venting pipe passes through the side wall of the buffer pressure stabilizing tank 200 and extends to the upper part of the buffer pressure stabilizing tank 200. The other end of the venting pipe is located outside the buffer pressure stabilizing tank 200 to recover the protective gas inside the buffer pressure stabilizing tank 200. A pneumatic valve is also provided at the other end of the venting pipe to control the opening and closing of the venting pipe. In some embodiments, the end of the venting pipe outside the buffer pressure stabilizing tank 200 can be connected to the protective gas source 10 to recover the protective gas inside the buffer pressure stabilizing tank 200 into the protective gas source 10, thereby realizing the recycling of the protective gas and reducing the cost of use.

[0049] In this embodiment, a tank return pipe 250 is also provided at the bottom of the buffer pressure stabilizing tank 200. One end of the tank return pipe 250 is connected to the buffer pressure stabilizing tank 200, and the other end is connected to the storage tank 20. A manual valve is provided on the tank return pipe 250. When the ship is in a closed state, the liquid clean fuel in the supply system needs to be emptied. Therefore, the liquid clean fuel in the buffer pressure stabilizing tank 200 can flow back to the storage tank 20 through the tank return pipe 250 to improve resource utilization and protect the fuel supply system and the lives of the personnel.

[0050] In this embodiment, the auxiliary pressurization device 300 pressurizes the protective gas in the protective gas source 10 and inputs it into the buffer pressure stabilizing tank 200 to ensure the pressure within the buffer pressure stabilizing tank 200, thereby continuously applying a stable pressure to the liquid clean fuel within the buffer pressure stabilizing tank 200. The auxiliary pressurization device 300 can be started and stopped based on information collected by the liquid level sensor 210 and the pressure sensor 220, thereby achieving dynamic balance of the pressure within the buffer pressure stabilizing tank 200 within a certain range. This pressure range can be adjusted in real time by pressurizing the auxiliary pressurization device 300.

[0051] The input end of the auxiliary pressurizing device 300 is connected to the storage tank 20, and the output end of the auxiliary pressurizing device 300 is connected to the upper part of the buffer pressure stabilizing tank 200. The output end of the auxiliary pressurizing device 300 is also equipped with a pneumatic valve and a check valve to prevent the protective gas input into the buffer pressure stabilizing tank 200 from flowing back into the auxiliary pressurizing device 300.

[0052] The input end of the auxiliary pressurization device 300 is also equipped with a manual valve, which allows for emergency control of the switching on and off of the auxiliary pressurization device 300.

[0053] In this embodiment, the marine clean fuel supply system also includes a temperature regulating device 400, which is located at the output end of the buffer pressure tank 200 to regulate the temperature of the liquid clean fuel output from the buffer pressure tank 200.

[0054] The output end of the buffer pressure tank 200 is equipped with two parallel temperature-regulating pipelines, through which the liquid clean fuel in the buffer pressure tank 200 can be input to the ship's power plant 30. The temperature-regulating device 400 includes a radiator 410 and a heater 420, which are respectively located on the two temperature-regulating pipelines to regulate the temperature of the liquid clean fuel input to the ship's power plant 30.

[0055] In some embodiments, the radiator 410 is an air-cooled radiator 410, and the heater 420 is a hot water circulation heater 420. In other embodiments, the air-cooled radiator 410 is provided with a cooling fan 411 to improve the heat dissipation performance of the air-cooled radiator 410.

[0056] In some embodiments, pneumatic valves are provided at the input ends of both temperature-regulating pipelines. These valves open upon receiving temperature information from the temperature sensor 230, allowing the clean fuel in the buffer pressure tank 200 to selectively pass through the two temperature-regulating pipelines. In other embodiments, one-way valves are provided at the output ends of the two temperature-regulating pipelines to prevent the liquid clean fuel output from the two temperature-regulating pipelines from flowing back into the two temperature-regulating pipelines.

[0057] In this embodiment, the marine clean fuel supply system also includes a pressure regulating valve 500, which is located between the output end of the temperature regulating device 400 and the ship's power unit 30 to reduce and stabilize the pressure of the liquid clean fuel so that the pressure of the liquid clean fuel after being regulated by the pressure regulating valve 500 is the pressure required by the ship's power unit 30.

[0058] In some embodiments, there are multiple pressure regulating valves 500 connected in parallel to achieve one valve in use and multiple valves in standby, thereby ensuring the reliability and safety of the supply system and facilitating the maintenance and replacement of the pressure regulating valves 500. In some embodiments, there are two pressure regulating valves 500 to achieve one valve in use and one valve in standby.

[0059] Each of the multiple pressure regulating valves 500 is equipped with a pneumatic valve at its input end to control the connection of the multiple pressure regulating valves 500. Each of the multiple pressure regulating valves 500 is also equipped with a pressure regulating valve filter 720 to filter the liquid clean fuel input to the pressure regulating valves 500. The pressure regulating valve filter 720 is used to filter the protective gas mixed in with the liquid clean fuel.

[0060] Each of the multiple pressure regulating valves 500 is equipped with a manual valve at its output end, allowing for maintenance or replacement of the corresponding pressure regulating valve 500 by closing the corresponding pneumatic or manual valve. The output ends of the multiple pressure regulating valves 500 are combined and connected to the ship's power unit 30. A pressure gauge 610 is installed at the output end of each pressure regulating valve 500 to collect pressure information of the liquid clean fuel output by the pressure regulating valve 500.

[0061] In this embodiment, the marine clean fuel supply system also includes a bypass valve 620, which is connected to the output end of the pressure regulating valve 500 and located between the pressure gauge 610 and the storage tank 20. The bypass valve 620 can open and close based on the pressure information collected by the pressure gauge 610. When the pressure of the liquid clean fuel output after the pressure regulating valve 500 is adjusted is detected by the pressure gauge 610 and is still higher than the pressure requirement of the liquid clean fuel for the ship's power plant 30, a portion of the liquid clean fuel can be output back to the storage tank 20 through the bypass valve 620 to reduce the pressure of the liquid clean fuel input to the ship's power plant 30 and at the same time reduce the input amount of liquid clean fuel.

[0062] In this embodiment, the marine clean fuel supply system also includes a flow meter 630, which is connected to the output of the pressure regulating valve 500 and the input of the ship's power unit 30. This allows it to collect the flow rate of clean fuel output from the pressure regulating valve 500 to the ship's power unit 30. Furthermore, the fuel pressurization pump 100 can be frequency-controlled according to the flow meter 630 to meet the flow requirements of different ship's power units 30.

[0063] In this embodiment, the marine clean fuel supply system also includes a protective gas purging device, which can purge the liquid clean fuel in the fuel pressurization pump 100, buffer pressure stabilizing tank 200, temperature regulating device 400 and pressure regulating valve 500, so that it flows back into the storage tank 20.

[0064] The protective gas purging device includes a first purging pipeline 810, a second purging pipeline 820, and an emptying pipeline 830. One end of the first purging pipeline 810 is connected to the protective gas source 10, and the other end of the first purging pipeline 810 is connected to the input end of the fuel pressurization pump 100. The other end of the second purging pipeline 820 is connected to the output end of the pressure regulating valve 500. One end of the emptying pipeline 830 is connected to the output end of the pressure regulating valve 500, and the other end of the emptying pipeline 830 is connected to the storage tank 20.

[0065] In some embodiments, the first purge line 810 is equipped with an electric valve and a check valve to prevent nitrogen gas input to the fuel pressurization pump 100 from flowing back into the storage tank 20. In other embodiments, the second purge line 820 is equipped with a check valve to prevent the input protective gas from flowing back into the protective gas source 10. In other embodiments, the vent line 830 is equipped with a pneumatic valve to control the opening and closing of the vent line 830. The output end of the pneumatic valve on the vent line 830 is connected to the output end of the bypass valve 620, so that the liquid clean fuel in the bypass valve 620 can flow back into the storage tank 20 through the vent line 830.

[0066] When the protective gas in the protective gas source 10 passes through the first purge pipeline 810, it flows sequentially through the fuel pressurization pump 100, the buffer pressure stabilizing tank 200, the temperature control device 400, and the pressure regulating valve 500, and then flows back to the storage tank 20 through the vent pipeline 830 to ensure the safety of the supply system. In other embodiments, when the protective gas in the protective gas source 10 passes through the first purge pipeline 810, it flows sequentially through the fuel pressurization pump 100, the buffer pressure stabilizing tank 200, the temperature control device 400, and the pressure regulating valve 500, and then is output to the outside through the ship's power unit 30 to ensure the safety of the supply system.

[0067] When the protective gas from the protective gas source 10 passes through the first purging pipeline 810, it can enter the fuel pressurization pump 100, and cause the liquid fuel in the buffer pressure stabilizing tank 200 to flow back to the storage tank 20 through the tank return pipe 250.

[0068] In this embodiment, when the second purge line 820 is opened, the protective gas input into the second purge line 820 connects to the output end of the pressure regulating valve 500, and the liquid clean fuel in the pressure gauge 610 and flow meter 630 flows back to the storage tank 20 through the venting line 830. In other embodiments, when the second purge line 820 is opened, it can purge the liquid clean fuel in the pipeline between the output end of the pressure regulating valve 500 and the ship's power unit 30 into the ship's power unit 30, and empty the ship's power unit 30.

[0069] In other embodiments, the first purging line 810 and the second purging line 820 may be used selectively. The purged liquid clean fuel may be selectively discharged outside the marine clean fuel supply system via the vent line 830 or the ship's power unit 30.

[0070] In this embodiment, the marine clean fuel supply system also includes a clean fuel filter 710, which is disposed at the input end of the fuel pressurization pump 100 to filter the liquid clean fuel in the storage tank 20.

[0071] See Figure 1 and Figure 2In this application, when the ship starts, the fuel pressurization pump 100 is turned on, and the fuel pressurization pump 100 pressurizes the liquid clean fuel in the storage tank 20 and inputs it into the buffer pressure stabilizing tank 200. When the liquid clean fuel is input into the buffer pressure stabilizing tank, the auxiliary pressurization device 300 is turned on to input high-pressure protective gas into the buffer pressure stabilizing tank 200, so as to continuously apply a stable pressure to the liquid clean fuel in the buffer pressure stabilizing tank 200, and ensure that the liquid clean fuel in the buffer pressure stabilizing tank 200 is stably and continuously output to the ship's power plant 30, so as to ensure complete combustion of fuel and sufficient kinetic energy of the ship's power plant 30.

[0072] Figure 3 This is a flowchart illustrating the control method of the marine clean fuel supply system of the present invention.

[0073] See Figure 1 and Figure 3 This application also includes a control method for a marine clean fuel supply system, which is applied to the marine clean fuel supply system to control the marine clean fuel supply system to adapt to different ship power units 30, so as to provide the ship power unit 30 with clean fuel under continuous and stable pressurization.

[0074] The control method includes the following steps: S100: When the ship is in a self-stopped state and preparing to sail, the marine clean fuel supply system is idle.

[0075] S200, the fuel pressurizing pump 100 and the auxiliary pressurizing device 300 are started simultaneously. The liquid clean fuel in the storage tank 20 is pressurized by the fuel pressurizing pump 100 and then input into the buffer pressure stabilizing tank 200. The protective gas in the protective gas source 10 is input into the buffer pressure stabilizing tank 200 through the auxiliary pressurizing device 300, so that the liquid clean fuel in the buffer pressure stabilizing tank 200 is kept under high pressure under the action of the protective gas.

[0076] S300, the liquid clean fuel in the buffer pressure tank 200 can be continuously output to the ship's power plant 30 under pressure, so as to continuously provide the ship's power plant 30 with liquid clean fuel with stable pressure.

[0077] In some embodiments, the buffer pressure tank 200 further includes a level sensor 210 and a pressure sensor 220. The pressure sensor 220 is used to detect the pressure of the buffer pressure tank 200. When the liquid clean fuel exceeds the first level, the liquid clean fuel in the buffer pressure tank 200 can be output to the ship's power unit 30.

[0078] Figure 4 This is a flowchart illustrating the control method S201 of the present invention.

[0079] See Figure 3 and Figure 4 In step S200, S201 also includes the simultaneous activation of the fuel pressurization pump 100 and the auxiliary pressurization device 300. The liquid clean fuel level sequentially exceeds the first level and the second level. When it reaches the third level, the fuel pressurization pump 100 is stopped to prevent the liquid clean fuel level from exceeding the third level excessively. When the pressure reaches the preset pressure value corresponding to the third level, the auxiliary pressurization device 300 is stopped. The liquid clean fuel in the buffer pressure stabilizing tank 200 can be continuously supplied to the ship's power plant 30.

[0080] Figure 5 This is a flowchart illustrating the control methods S301-S303 of the present invention.

[0081] See Figure 1 and Figure 5 In step S300, there is also step S301, when the ship is moving and the ship's power plant 30 is working, the liquid clean fuel in the buffer pressure tank 200 is output, the fuel pressurization pump 100 stops working, the liquid level in the buffer pressure tank 200 continues to drop, and the pressure gradually decreases.

[0082] S302, when the liquid level of the liquid clean fuel drops from the third level to the second level, and the pressure detected by the pressure sensor 220 is less than the preset pressure value corresponding to the second level, the fuel pressurization pump 100 and the auxiliary pressurization device 300 start to raise the liquid level in the buffer pressure stabilizing tank 200 and make the pressure greater than the preset pressure value corresponding to the second level.

[0083] In some embodiments, the pressure preset value corresponding to the second liquid level is 1.8 MPa. This pressure preset value can be changed according to the size, model, and requirements of the ship's power unit 30, and it has a changeable performance.

[0084] When the clean fuel level drops to the second level, the buffer pressure tank 200 begins to replenish fuel and gas, preventing the fuel supply system from reacting slowly only when the first level is reached, thus avoiding forcing the ship's propulsion unit 30 to shut down. Furthermore, when the fuel level reaches the third level, the pressure inside the buffer pressure tank 200 is precisely within the preset pressure range corresponding to that third level.

[0085] In some embodiments, when the ship's power plant 30 is operating, once the liquid level in the pressure tank 200 falls below the third level, the fuel pressurization pump 100 starts operating. However, the output of the fuel pressurization pump 100 is less than the output of the pressure tank 200, causing the liquid level in the pressure tank 200 to continue to drop. When the liquid level in the pressure tank 200 drops to the second level, the auxiliary pressurization device 300 starts to maintain pressure stability. The fuel pressurization pump 100 increases its output to raise the liquid level in the pressure tank 200, thus maintaining the liquid level in the pressure tank 200. This continuously applies a stable pressure to the liquid clean fuel in the pressure tank 200, ensuring a stable and continuous output of the liquid clean fuel from the pressure tank 200 to the ship's power plant 30, guaranteeing complete fuel combustion and sufficient kinetic energy for the ship's power plant 30.

[0086] When the pressure inside the buffer pressure stabilizing tank 200 is too high, the venting device 240 inside the buffer pressure stabilizing tank 200 can discharge the overcharge protection gas caused by misoperation, so as to protect the buffer pressure stabilizing tank 200 from overpressure.

[0087] In some embodiments, step S300 further includes S303, wherein a temperature sensor 230 is provided on the buffer pressure tank 200, and the marine clean fuel supply system includes a radiator 410 and a heater 420; when the temperature inside the buffer pressure tank 200 is less than 25°C, the liquid clean fuel is processed by the heater 420 and then output to the ship's power unit 30; when the temperature is greater than 25°C, the liquid clean fuel is processed by the radiator 410 and then output to the ship's power unit 30.

[0088] In some embodiments, when the temperature inside the buffer pressure tank 200 is greater than 48°C, the liquid clean fuel passes through the radiator 410 and the cooling fan 411 is activated to improve the heat dissipation performance of the radiator 410. When the temperature inside the buffer pressure tank 200 is in the range of 25°C to 48°C, the liquid clean fuel passes through the radiator 410, but the cooling fan 411 is stopped, allowing the liquid clean fuel to dissipate heat through the ambient temperature radiator 410. The temperature control device 400 controls the temperature of the liquid clean fuel in the engine only within the range of 20°C to 50°C. The above temperature ranges and values ​​are only examples of temperatures in the embodiments. When the model and requirements of the ship's power unit 30 are different, the temperature range of this supply system can be customized and preset according to the requirements of the ship's power unit 30 to meet the needs of different ranges of ship's power units 30.

[0089] In some embodiments, a pressure regulating valve 500 and a flow meter 630 are also included. The pressure regulating valve 500 reduces the pressure of the liquid clean fuel output from the buffer pressure tank 200 and then outputs it to the ship's power plant 30.

[0090] Figure 6This is a flowchart illustrating the control method S400-S500 of the present invention.

[0091] See Figure 3 and Figure 6 After S300, step S400 is also included, in which the flow meter 630 collects the flow value output by the pressure regulating valve 500 and can adjust the power of the fuel pressurization pump 100 according to the flow value of the liquid clean fuel required by the ship's power unit 30 and the flow value output by the pressure regulating valve 500.

[0092] In some embodiments, the liquid clean fuel adjusted by the temperature control device 400 is supplied to the engine after the pressure is set between 1.3 MPa ± 0.5 MPa by the pressure regulating valve 500. The pressure regulating valve 500 can be adjusted according to the pressure requirements of the ship's power plant 30, and its model and pressure adjustment range can be adjusted as needed, so that the pressure adjustment range of the pressure regulating valve 500 is variable.

[0093] In some embodiments, the control system can calculate the pressure value of the clean fuel pumped into the fuel pressurization pump 100 by using the pressure data collected by the pressure gauge 610 at the rear end of the pressure regulating valve 500.

[0094] In order to ensure that the flow fluctuations caused by sudden increases / decreases in the load of the ship's power unit 30 are within the range that the pressure regulating valve 500 can adjust, the control system is equipped with a bypass valve 620 at the output end of the pressure regulating valve 500.

[0095] See Figure 3 and Figure 6 Step S400 is followed by step S500. The bypass valve 620 ensures that the pressure rises after the pressure regulating valve 500 when the load of the ship's power unit 30 is suddenly reduced. When the pressure exceeds 13.5 MPa, the bypass valve 620 automatically opens, and when the pressure drops back to 12.5 MPa, the bypass valve 620 closes.

[0096] See Figure 3 and Figure 6 In some embodiments, step S500 is followed by step S600, where flow meter 630 is used to detect the amount of liquid clean fuel input to the ship's power unit 30 per unit time. It can provide variable frequency data for the fuel variable frequency pump so that the fuel variable frequency pump can switch different gears to output liquid clean fuel with different pressures and flow rates into the buffer pressure tank 200.

[0097] In some embodiments, when the ship is not in operation, to protect the safety of the marine clean fuel supply system and facilitate its maintenance, a protective gas purging device is activated. This allows the protective gas purging device to clean the liquid clean fuel in the fuel pressurization pump 100, buffer pressure tank 200, temperature control device 400, pressure regulating valve 500, and their pipelines. The purged liquid clean fuel can then be returned to the storage tank 20 to improve resource utilization efficiency. The parameters in the above embodiments are merely illustrative, and the parameter ranges in each embodiment are not fixed combinations.

[0098] Although this application has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since this application can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A marine clean fuel supply system for delivering liquid clean fuel from a storage tank to the ship's propulsion system, characterized in that, include: A fuel pressurization pump connected to the storage tank to pressurize liquid clean fuel; A buffer pressure stabilizing tank, which is connected to the fuel pressurization pump, is used to contain pressurized liquid clean fuel; An auxiliary pressurization device is connected to an external protective gas source and the buffer pressure stabilizing tank. The auxiliary pressurization device pressurizes the protective gas in the protective gas source and inputs it into the buffer pressure stabilizing tank to maintain the pressure stability in the buffer pressure stabilizing tank. Under the action of the auxiliary pressurization device, the liquid clean fuel in the buffer pressure stabilizing tank is continuously output to the ship's power unit; The buffer pressure stabilizing tank also includes a liquid level sensor and a pressure sensor. The buffer pressure stabilizing tank is provided with a first liquid level, a second liquid level, and a third liquid level from bottom to top. The pressure sensor is used to detect the pressure of the buffer pressure stabilizing tank. When the liquid clean fuel exceeds the first liquid level, the liquid clean fuel in the buffer pressure stabilizing tank can be output to the ship's power unit. The fuel pressurizing pump and the auxiliary pressurizing device are started simultaneously. The liquid level of the liquid clean fuel successively exceeds the first liquid level and the second liquid level. When it reaches the third liquid level, the fuel pressurizing pump is stopped. When the pressure reaches the preset pressure value corresponding to the third liquid level, the auxiliary pressurizing device is stopped. The liquid clean fuel in the buffer pressure tank can be continuously supplied to the ship's power unit. When the liquid level of the liquid clean fuel drops from the third level to the second level, and the pressure detected by the pressure sensor is less than the preset pressure value corresponding to the second level, the fuel pressurization pump and the auxiliary pressurization device start to make the pressure in the buffer pressure tank greater than the preset pressure value corresponding to the second level.

2. The marine clean fuel supply system according to claim 1, characterized in that, The buffer pressure stabilizing tank is equipped with multiple liquid level sensors, which are arranged sequentially along the vertical direction of the buffer pressure stabilizing tank. The liquid level sensors are used to collect liquid level information in the buffer pressure stabilizing tank, and the fuel pressurization pump is turned on or off according to the liquid level information.

3. The marine clean fuel supply system according to claim 2, characterized in that, It also includes a pressure sensor located on the buffer pressure stabilizing tank. The pressure sensor is used to collect pressure information inside the buffer pressure stabilizing tank. When the liquid level reaches the liquid level specified by the liquid level sensor, the pressure preset value corresponding to each liquid level is compared to determine whether the auxiliary pressurization device is turned on or off.

4. The marine clean fuel supply system according to claim 1, characterized in that, It also includes a temperature regulating device and a temperature sensor. The temperature regulating device is located at the output end of the buffer pressure stabilizing tank to regulate the temperature of the liquid clean fuel output from the buffer pressure stabilizing tank. The temperature sensor is located on the buffer pressure stabilizing tank to collect the temperature information inside the buffer pressure stabilizing tank. The temperature regulating device adjusts the temperature according to the temperature sensor.

5. The marine clean fuel supply system according to claim 4, characterized in that, The output end of the buffer pressure tank is provided with two parallel temperature regulating pipelines. The liquid clean fuel in the buffer pressure tank can be input to the ship's power unit through the two temperature regulating pipelines respectively. The temperature regulating device includes a radiator and a heater. The radiator and the heater are respectively located on the two temperature regulating pipelines so as to adjust the temperature of the liquid clean fuel input to the ship's power unit respectively.

6. The marine clean fuel supply system according to claim 4, characterized in that, A pressure regulating valve is provided between the temperature regulating device and the ship's power unit to reduce and stabilize the pressure of the liquid clean fuel to the pressure required by the ship's power unit.

7. The marine clean fuel supply system according to claim 6, characterized in that, A flow meter is installed at the output end of the pressure regulating valve. The flow meter is used to collect the flow rate of the liquid clean fuel output by the pressure regulating valve. The fuel pressurizing pump is a variable frequency pump, and the fuel pressurizing pump is frequency-adjusted according to the flow meter.

8. The marine clean fuel supply system according to claim 6, characterized in that, There are multiple pressure regulating valves and multiple fuel pressurizing pumps, with the multiple pressure regulating valves and multiple fuel pressurizing pumps connected in parallel.

9. The marine clean fuel supply system according to claim 6, characterized in that, It also includes a protective gas purging device, which includes a first purging pipeline, a second purging pipeline, and a venting pipeline. One end of the first purging pipeline is connected to the protective gas source, and the other end of the first purging pipeline is connected to the input end of the fuel pressurizing pump. The other end of the second purging pipeline is connected to the output end of the pressure regulating valve. One end of the venting pipeline is connected to the output end of the pressure regulating valve, and the other end of the venting pipeline is connected to the storage tank. The protective gas purging device can clean the liquid clean fuel in the fuel pressurizing pump, the buffer pressure stabilizing tank, the temperature regulating device, and the pressure regulating valve and return it to the storage tank.

10. A control method for a marine clean fuel supply system, applied to the marine clean fuel supply system as described in any one of claims 1-9, characterized in that, include: The fuel pressurizing pump and the auxiliary pressurizing device are started simultaneously, and the liquid clean fuel in the storage tank is pressurized by the fuel pressurizing pump and then input into the buffer pressure stabilizing tank. The protective gas in the protective gas source is input into the buffer pressure stabilizing tank through the auxiliary pressurization device, so that the liquid clean fuel in the buffer pressure stabilizing tank is kept under high pressure under the action of the protective gas. The liquid clean fuel in the buffer pressure tank can be continuously output to the ship's power unit under pressure, so as to continuously provide the ship's power unit with liquid clean fuel with stable pressure.

11. The control method according to claim 10, characterized in that, It also includes a pressure regulating valve and a flow meter. The pressure regulating valve reduces the pressure of the liquid clean fuel output from the buffer pressure stabilizing tank and then outputs it to the ship's power unit. The flow meter collects the flow rate value output by the pressure regulating valve and can adjust the power of the fuel pressurizing pump according to the flow rate value of the liquid clean fuel required by the ship's power unit and the flow rate value output by the pressure regulating valve.

12. The control method according to claim 10, characterized in that, The buffer pressure tank is equipped with a temperature sensor. The marine clean fuel supply system includes a radiator and a heater, and the radiator is equipped with a cooling fan. When the temperature inside the buffer pressure tank is less than 25°C, the liquid clean fuel is processed by the heater and then output to the ship's power unit. When the temperature is greater than 48°C, the liquid clean fuel is processed by the radiator and then output to the ship's power unit, at which time the cooling fan is turned on. When the temperature inside the buffer pressure tank is between 25°C and 48°C, the liquid clean fuel is processed by the radiator, and the cooling fan is turned off.

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