Fuel supply system

Abstract

The application discloses a fuel supply system and belongs to the technical field of engine fuel systems. The fuel supply system comprises a control unit, a storage unit, a pressurizing unit and a temperature regulating unit connected with the control unit respectively; the temperature regulating unit is connected with the storage unit, the control unit is used for controlling the temperature regulating unit to provide a second working medium to the storage unit; the pressurizing unit is connected with the storage unit, the control unit is used for controlling the pressurizing unit to pressurize the storage unit; the storage unit is connected with a fuel machine, and the control unit is used for controlling the storage unit to provide a first working medium and output fuel to the fuel machine. The fuel supply system uses the control unit to control the pressurizing unit to pressurize the storage unit, so that the first working medium can be stored at normal temperature and high pressure, and long-time pressure accumulation is ensured; the control unit is used for controlling the temperature regulating unit to provide the second working medium to the storage unit, and the control unit is used for controlling the storage unit to provide the first working medium and output the fuel to the fuel machine, so that fuel storage and temperature regulation are realized.

Description

Technical Field

[0001] This application relates to the field of engine fuel system technology, specifically to a fuel supply system. Background Technology

[0002] Faced with increasingly stringent environmental protection requirements, ammonia fuel, as a clean fuel with zero carbon emissions, has a promising future in the marine fuel sector in order to reduce air pollution from ship exhaust. The ammonia fuel supply system is a crucial system for ammonia-powered ships, and its design is attracting increasing attention. However, existing marine ammonia fuel supply system solutions typically suffer from the following problems: ammonia fuel requires cryogenic storage, increasing the design work of storage tanks and the configuration of insulation layers; simultaneously, the low design pressure of the storage tanks prevents them from independently achieving long-term pressurization, necessitating additional consideration of tank depressurization equipment, further complicating the system; ammonia fuel is prone to vaporization, leading to cavitation of the fuel pump impeller; furthermore, the fuel pump has a minimum liquid level requirement for the ammonia fuel tank, making it impossible to utilize all the ammonia fuel in the tank, resulting in waste. Additionally, fuel pumps generally have stringent inlet pressure requirements, making it difficult for them to adapt to operating conditions with large variations in inlet pressure. Summary of the Invention

[0003] The purpose of this application is to provide a fuel supply system for solving the problem of how to store fuel and regulate fuel temperature to meet the needs of fuel engines.

[0004] This application provides a fuel supply system, comprising: a control unit, a storage unit, a pressurization unit, and a temperature control unit respectively connected to the control unit; the temperature control unit is connected to the storage unit, and the control unit is used to control the temperature control unit to provide a second working fluid to the storage unit; the pressurization unit is connected to the storage unit, and the control unit is used to control the pressurization unit to pressurize the storage unit; the storage unit is connected to a fuel engine, and the control unit is used to control the storage unit to provide a first working fluid and output fuel to the fuel engine.

[0005] In some embodiments, the storage unit includes a storage tank, a first heat exchanger, and a first buffer tank connected in sequence. The first buffer tank has a supply end at the end away from the first heat exchanger. The supply end is connected to a fuel engine and is used to supply fuel to the fuel engine.

[0006] In some embodiments, the control unit includes: a first control valve disposed in the storage tank; and a second control valve connected between the first buffer tank and the supply end; the control unit controls the storage tank to supply the first working fluid to the first heat exchanger via the first control valve, and the control unit controls the supply end to supply the fuel to the fuel engine via the second control valve.

[0007] In some embodiments, the pressurization unit includes an air compressor, a generator, a second buffer tank, a booster, and a pressurization tank connected in sequence. The pressurization tank is connected to the storage tank, and the pressurization unit is used to provide a third working fluid to the storage tank for pressurization.

[0008] In some embodiments, the control unit includes: a pressure sensor disposed in the storage tank for detecting the pressure value of the storage tank; a valve assembly and a sixth control valve, the valve assembly being disposed between the storage tank and the pressurization tank, and the sixth control valve being disposed between the valve assembly and the pressurization tank; when the pressure value detected by the pressure sensor is less than a first preset pressure value, the control unit controls the pressurization tank to pressurize the storage tank by opening the valve assembly and closing the sixth control valve; when the pressure value detected by the pressure sensor is greater than a second preset pressure value, the control unit controls the pressurization tank to stop pressurizing the storage tank by closing the valve assembly.

[0009] In some embodiments, when the pressure in the booster tank is lower than a third preset pressure, the control unit controls the booster to pressurize the third working fluid in the second buffer tank and deliver it to the booster tank; when the pressure in the booster tank is higher than a fourth preset pressure value, the control unit controls the booster and the second buffer tank to stop delivering the third working fluid to the booster tank; when the pressure in the second buffer tank is lower than a fifth preset pressure value, the control unit controls the air compressor and the generator to start to replenish the third working fluid to the second buffer tank; when the pressure in the second buffer tank is higher than a sixth preset pressure value, the control unit controls the air compressor and the generator to shut down to stop supplying the third working fluid to the second buffer tank.

[0010] In some embodiments, the control unit further includes a safety valve disposed in the storage tank.

[0011] In some embodiments, the temperature control unit includes a circulating pump, a second heat exchanger, and an expansion tank. The circulating pump is connected to the second heat exchanger, and the first heat exchanger is connected to both the circulating pump and the second heat exchanger. The expansion tank is connected to the circulating pump. The circulating pump is used to deliver the second working fluid, the second heat exchanger is used to heat the second working fluid and add it to the first heat exchanger, and the expansion tank is used to absorb the volume change of the second working fluid.

[0012] In some embodiments, the expansion tank is provided with a vent pipe, and a gas detection device is installed on the vent pipe. The gas detection device is used to detect the concentration of combustible gas in the temperature control unit. When the concentration of combustible gas in the temperature control unit is between 20% LEL and 40% LEL, the gas detection device issues an alarm that the supply end stops supplying fuel to the fuel engine.

[0013] In some embodiments, the control unit further includes a seventh control valve disposed in the second heat exchanger, and the control unit adjusts the opening degree of the seventh control valve to control the temperature of the second working fluid.

[0014] In some embodiments, the control unit further includes an eighth control valve disposed on the first heat exchanger, and the control unit controls the temperature of the fuel output by the first heat exchanger by adjusting the opening degree of the eighth control valve.

[0015] In some embodiments, the control unit further includes a flow sensor connected to the temperature control unit. The flow sensor is used to detect the flow rate of the second working fluid. When the flow rate of the second working fluid is lower than a first preset flow rate value, the control unit issues an alarm through the flow sensor that the supply end stops supplying the first working fluid to the fuel engine.

[0016] In some embodiments, the system further includes a filling unit, which includes a liquid phase filling pipe and a gas return pipe. The storage tank is connected to the liquid phase filling pipe and the gas return pipe, respectively. The liquid phase filling pipe is used to fill the storage tank with the fourth working fluid, and the gas return pipe is used for the gas return of the fourth working fluid.

[0017] In some embodiments, the control unit includes a ninth control valve and a tenth control valve. The ninth control valve is connected to the liquid phase injection pipe, and the tenth control valve is connected to the gas return pipe. The control unit is used to control the injection unit to disconnect from the storage unit by closing the ninth control valve and the tenth control valve when the temperature control unit is working on the storage unit.

[0018] In some embodiments, the first working medium is room temperature pressurized liquid ammonia fuel, the second working medium is a water-ethylene glycol mixture, the fuel is ammonia fuel, the third working medium is nitrogen, and the fourth working medium is liquid ammonia.

[0019] The beneficial effects of this application are as follows: The fuel supply system includes a control unit, a storage unit, a pressurization unit, and a temperature control unit, all connected to the control unit. The temperature control unit is connected to the storage unit, and the control unit controls the temperature control unit to provide a second working fluid to the storage unit. The pressurization unit is connected to the storage unit, and the control unit controls the pressurization unit to pressurize the storage unit. The storage unit is connected to the fuel engine, and the control unit controls the storage unit to provide a first working fluid and output fuel to the fuel engine. This fuel supply system, by using the control unit to control the pressurization unit to pressurize the storage unit, overcomes the problem of difficult pressure control in existing fuel pump systems, enabling the storage of the first working fluid at room temperature and high pressure, ensuring long-term pressurization. Furthermore, by using the control unit to control the temperature control unit to provide a second working fluid to the storage unit, and the control unit to control the storage unit to provide the first working fluid and output fuel to the fuel engine, both fuel storage and temperature control are achieved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the fuel supply system according to an embodiment of this application;

[0022] Reference numerals: 100-Storage unit, 110-Storage tank, 120-First heat exchanger, 130-First buffer tank, 140-Supply end, 200-Pressure booster unit, 210-Air compressor, 220-Generating device, 230-Second buffer tank, 240-Pressure booster, 250-Pressure booster tank, 300-Refilling unit, 310-Liquid phase filling pipe, 320-Gas return pipe, 400-Temperature control unit, 410-Circulating pump, 420-Second heat exchanger, 430-Expansion water Box, 432-vent pipe, 431-gas detection equipment, 500-control unit, 511-first control valve, 512-second control valve, 513-pressure sensor, 514-safety valve, 525-valve assembly, 520-third control valve, 522-fourth control valve, 523-fifth control valve, 524-sixth control valve, 541-seventh control valve, 521-eighth control valve, 542-flow sensor, 531-ninth control valve, 532-tenth control valve. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0024] This application addresses the problem of how to store and regulate fuel temperature to meet the needs of fuel engines, providing a fuel supply system, particularly an ammonia fuel supply system for a marine engine, belonging to the technical field of marine engine fuel systems. Detailed descriptions follow. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments.

[0025] Please see Figure 1 This application provides a fuel supply system, including a control unit 500, a storage unit 100, a pressurization unit 200, and a temperature control unit 400, all connected to the control unit 500. The temperature control unit 400 is connected to the storage unit 100, and the control unit 500 controls the temperature control unit 400 to provide a second working fluid to the storage unit 100. The pressurization unit 200 is connected to the storage unit 100, and the control unit 500 controls the pressurization unit 200 to pressurize the storage unit 100. The storage unit 100 is connected to a fuel engine 600, and the control unit 500 controls the storage unit 100 to provide a first working fluid and output fuel to the fuel engine 600.

[0026] This embodiment of the fuel supply system utilizes a control unit 500 connected to a pressurization unit 200. The control unit 500 controls the pressurization unit 200 to pressurize the storage unit 100. Furthermore, the control unit 500 is connected to the storage unit 100, and the storage unit 100 is connected to the pressurization unit 200. This allows for the storage of the first working fluid at room temperature and high pressure, ensuring long-term pressure storage and overcoming the problem of uncontrollable supply pressure in existing fuel pump systems. It also eliminates the need for additional pressure-reducing equipment in the storage tank, avoiding system design complexity. The control unit 500 is connected to a temperature control unit 400, which in turn is connected to the storage unit 100. This allows the control unit 500 to control the temperature control unit 400 to provide a second working fluid to the storage unit 100. The second working fluid provided by the temperature control unit 400 enters the storage unit 100 and mixes with the first working fluid in the storage unit 100 to produce fuel for delivery to the fuel engine, thereby achieving fuel storage and temperature control. Therefore, the fuel is stored independently by the storage unit 100, the pressurization unit 200 pressurizes the fuel independently, and the temperature control unit 400 and the storage unit 100 work together to regulate the temperature of the fuel to meet the needs of the fuel engine 600. This fuel supply system has a simple process, is easy to control, and has a compact layout. It can overcome the drawbacks of traditional marine ammonia fuel supply systems and meet the usage requirements of the fuel engine 600. The storage unit 100 includes a storage tank 110, a first heat exchanger 120, and a first buffer tank 130 connected in sequence. The first buffer tank 130 has a supply end 140 at the end away from the first heat exchanger 120, and the supply end 140 is connected to the fuel engine 600. The pressurization unit 200 is connected to the storage tank 110 and is used to provide pressure to the storage tank 110. The refueling unit 300 is connected to the storage tank 110 and is used to provide a first working fluid to the storage tank 110. The temperature control unit 400 is connected to the first heat exchanger 120 and is used to provide a second working fluid to the first heat exchanger 120. The second working fluid enters the first heat exchanger 120 and mixes with the first working fluid to produce fuel. The supply end 140 is used to output fuel to the fuel engine 600.

[0027] Storage tank 110 is used to store the first working medium, which is room temperature high pressure liquid ammonia fuel. Storage tank 110 is equivalent to a room temperature high pressure storage tank. Storage tank 110, first heat exchanger 120, and first buffer tank 130 are connected by pipelines to form an airtight space. The first heat exchanger 120 and the first buffer tank 130 are both located on the same side of storage tank 110.

[0028] The control unit 500 includes a first control valve 511 and a second control valve 512. The first control valve 511 is disposed between the storage tank 110 and the first heat exchanger 120. The first control valve 511 is used to control the storage tank 110 to supply a first working fluid to the first heat exchanger 120, or the first control valve 511 is used to disconnect the first heat exchanger 120 from the storage tank 110. The first control valve 511 is used as the main valve of the bottom fuel compartment of the storage tank 110. The second control valve 512 is connected between the first buffer tank 130 and the supply end 140. The second control valve 512 is used as the main fuel valve of the storage unit 100.

[0029] The booster unit 200 includes an air compressor 210, a generator 220, a second buffer tank 230, a booster 240, and a booster tank 250 connected in sequence. The booster tank 250 is connected to the storage tank 110.

[0030] The control unit 500 also includes a pressure sensor 513, which is connected to the storage tank 110 and is used to detect the pressure of the storage tank 110.

[0031] The control unit 500 also includes a valve assembly 525 and a sixth control valve 524. The valve assembly 525 includes a third control valve 520, a fourth control valve 522, and a fifth control valve 523 connected in sequence. The third control valve 520, the fourth control valve 522, and the fifth control valve 523 are located between the storage tank 110 and the pressurization tank 250. The sixth control valve 524 is connected between the valve assembly 525 and the pressurization tank 250. This ensures that when a pipeline failure occurs between the storage tank 110 and the pressurization tank 250, the impact of gas, liquid, or pressure leakage on the storage tank 110 and / or the pressurization tank 250 is minimized, thereby achieving the safety protection function of the fuel supply system of this application.

[0032] When pressure sensor 513 detects that the pressure in storage tank 110 is lower than the first preset pressure value, pressurization unit 200 activates its operating mode. Control unit 500 opens valve group 525 and closes the sixth control valve 524. Pressurization tank 250 automatically replenishes the storage tank 110 with a third working medium to increase the pressure in storage tank 110. In this embodiment, the third working medium is nitrogen, and the nitrogen is high-pressure nitrogen. Conversely, when the pressure value detected by pressure sensor 513 is greater than the second preset pressure value, control unit 500 closes valve group 525 to control pressurization tank 250 to stop pressurizing storage tank 110.

[0033] In a preferred embodiment, the first preset pressure value is 8 bar, and the second preset pressure value is 12 bar.

[0034] The control unit 500 controls the booster 240 to start when the pressure in the booster tank 250 is lower than a third preset pressure value. The booster 240 pressurizes the nitrogen in the second buffer tank 230 and delivers it to the booster tank 250 to maintain the pressure in the booster tank 250, thereby maintaining the normal operation of the booster unit 200. Conversely, the control unit 500 controls the booster 240 to shut down when the pressure in the booster tank 250 is higher than a fourth preset pressure value. The booster 240 and the second buffer tank 230 stop delivering the third working fluid to the booster tank 250.

[0035] In a preferred embodiment, the third preset pressure value is 15 bar, and the fourth preset pressure value is 20 bar.

[0036] Similarly, the control unit 500 is used to start the air compressor 210 and the generator 220 when the pressure of the second buffer tank 230 is lower than the fifth preset pressure value, so as to replenish nitrogen into the second buffer tank 230; conversely, the control unit 500 is used to shut down the air compressor 210 and the generator 220 to stop supplying the third working fluid to the second buffer tank 230 when the pressure of the second buffer tank 230 is higher than the sixth preset pressure value.

[0037] In a preferred embodiment, the fifth preset pressure value is 6 bar, and the sixth preset pressure value is 9 bar.

[0038] When the pressure in the storage tank 110 is restored, the control unit 500 controls the third control valve 520, the fourth control valve 522 and the fifth control valve 523 to close respectively, and the control unit 500 controls the sixth control valve 524 to open, so that the pressurization tank 250 can pressurize the storage tank 110 with nitrogen.

[0039] The fuel supply system of this application overcomes the cavitation problem and the problem of difficulty in controlling the system supply pressure caused by the excessive range of pressure variation before the pump in the original fuel pump system by using the booster unit 200.

[0040] In addition, the control unit 500 also includes a safety valve 514, which is connected to the storage tank 110. When the pressure sensor 513 detects that the pressure in the storage tank 110 is too high, i.e., the pressure value of the storage tank 110 is greater than a second preset pressure value, the pressure sensor 513 issues an alarm, and the control unit 500 controls the pressurization unit 200 to stop supplying nitrogen pressurization to the storage tank 110. The storage tank 110 also includes a design pressure value, which is the limit pressure value of the storage tank 110 itself. When the pressure in the storage tank 110 reaches the adjustment pressure of the safety valve 514, the safety valve 514 opens to ensure that the pressure in the storage tank 110 is lower than the design pressure value. The adjustment pressure of the safety valve 514 is equal to or slightly less than the design pressure value of the storage tank 110. Preferably, the design pressure value is 25 bar.

[0041] Therefore, the fuel supply system of this application, using the control unit 500, can ensure that the pressure of the storage tank 110 is maintained within a set range, namely the range from the first preset pressure value to the fifth preset pressure value, during the fuel supply process. The fuel supply system of this application uses the storage tank 110 to store the first working medium, namely room temperature high-pressure ammonia fuel, which can ensure long-term pressure storage without the problem of overpressure in the storage tank 110.

[0042] The refueling unit 300 includes a liquid phase refueling pipe 310 and a gas return pipe 320. The storage tank 110 is connected to both the liquid phase refueling pipe 310 and the gas return pipe 320. The liquid phase refueling pipe 310 and the gas return pipe 320 serve as refueling stations for refueling the fourth working medium into the storage tank 110. It should be noted that in this embodiment, the ends of both the liquid phase refueling pipe 310 and the gas return pipe 320 away from the storage tank 110 extend to the shore end of the ship, meaning the fourth working medium originates from the shore. The fourth working medium is liquid nitrogen, and the gas return pipe 320 is used to supply ammonia. The refueling unit 300 is also designed with safety protection functions.

[0043] The control unit 500 includes a ninth control valve 531 and a tenth control valve 532. The ninth control valve 531 is connected to the liquid phase injection pipe 310, and the tenth control valve 532 is connected to the gas return pipe 320. When the temperature control unit 400 is connected to the storage unit 100, the control unit 500 controls the injection unit 300 to disconnect from the gas return pipe 320 by closing the ninth control valve 531 and the tenth control valve 532. That is, when the temperature control unit 400 is working normally, the ninth control valve 531 and the tenth control valve 532 are closed.

[0044] The temperature control unit 400 is used to circulate and heat the second working fluid, which serves as the heating medium to ensure the supply temperature of ammonia fuel from the supply end 140, i.e., to ensure the temperature of the liquid ammonia fuel in the storage unit 100 after being conditioned by the first heat exchanger 120. In this embodiment, the second working fluid is a water-ethylene glycol mixture. The temperature control unit 400 includes a circulation pump 410, a second heat exchanger 420, and an expansion tank 430. The circulation pump 410 is connected to the second heat exchanger 420, and both the circulation pump 410 and the second heat exchanger 420 are connected to the first heat exchanger 120. The expansion tank 430 is connected to the circulation pump 410. The temperature control unit 400 uses the circulation pump 410 to circulate the second working fluid and provide pressure and flow to it. The second heat exchanger 420 uses steam or hot water from the ship to heat the second working fluid and control its temperature within a certain range. The expansion tank 430 absorbs volume changes in the second working fluid.

[0045] The control unit 500 also includes a seventh control valve 541, which is located on the steam side or hot water side of the second heat exchanger 420. The control unit 500 controls the opening degree of the seventh control valve 541 according to the outlet temperature of the second working fluid to control the temperature of the second working fluid.

[0046] Furthermore, the control unit 500 also includes an eighth control valve 521, which is located on one side of the first heat exchanger 120. A second working fluid, namely a water-ethylene glycol mixture, at a certain temperature and flow rate enters the first heat exchanger 120 and exchanges heat with the first working fluid. The water-ethylene glycol mixture is then added to room temperature high-pressure liquid ammonia fuel to produce ammonia fuel. The temperature of the ammonia fuel at the outlet of the first heat exchanger 120 is controlled by the eighth control valve 521 to ensure that it is within a certain range. Specifically, the control unit 500 controls the opening degree of the eighth control valve 521 according to the ammonia fuel outlet temperature output from the first heat exchanger 120 to control the temperature of the ammonia fuel.

[0047] Furthermore, the expansion tank 430 is equipped with a vent pipe 432, and the vent pipe 432 is equipped with a gas detection device 431. The gas detection device 431 is a suction-type gas detection device. The gas detection device 431 is used to detect the concentration of combustible gas in the temperature control unit 400, thereby determining whether ammonia fuel heat exchange is occurring in the first heat exchanger 120. When the combustible gas concentration in the temperature control unit 400 is between 20% LEL and 40% LEL, the gas detection device 431 issues an alarm that the supply end 140 has stopped supplying fuel to the fuel engine 600, thereby reminding the operator to stop the operation of the fuel supply system of this application.

[0048] When the fuel supply system is normally supplying the first working medium, i.e., liquid ammonia fuel, it is necessary to ensure that the temperature regulating unit 400 is working properly. The control unit 500 controls the dispensing unit 300 to disconnect from the storage tank 110, and the dispensing unit 300 stops working, that is, the dispensing unit 300 stops dispensing the fourth working medium into the storage tank 110. The control unit 500 drives the first control valve 511 of the fuel compartment at the bottom of the storage tank 110 to open, and the first working medium, i.e., liquid ammonia fuel with a certain pressure, flows into the first heat exchanger 120 downstream of the storage tank 110 for temperature regulation. After temperature regulation... The raw fuel, namely ammonia fuel, is stored in the first buffer tank 130. When the temperature and pressure of the ammonia fuel in the first buffer tank 130 meet the requirements of the fuel engine 600, the control unit 500 provides an ammonia fuel ready signal to the fuel engine 600. When the fuel engine 600 receives the ammonia fuel ready signal and issues a signal that it needs to use ammonia fuel, the control unit 500 drives the second control valve 512 to open so that the supply end 140 supplies ammonia fuel to the fuel engine 600. The fuel supply system of this application enters the normal supply mode.

[0049] It should also be noted that before the storage unit 100 begins supplying the first working fluid to the fuel engine 600, it must be ensured that the temperature control unit 400 is functioning normally. The temperature control unit 400 is used to provide the second working fluid at a rated flow rate, the second heat exchanger 420 is used to allow the second working fluid to absorb heat from the ship's steam or cylinder liner water and transfer the absorbed heat to the first working fluid in the storage unit 100, and the expansion tank 430 is used to absorb the volume change of the second working fluid caused by heating.

[0050] The control unit 500 also includes a flow sensor 542, which is connected to the temperature control unit 400. The flow sensor 542 is used to monitor the flow rate of the second working fluid and to issue an alarm when the flow rate of the second working fluid is lower than the first preset flow rate value, so as to prompt the operator to shut off the supply of the first working fluid from the storage unit 100.

[0051] The control unit 500 is used to monitor the fuel supply system of this application. The first control valve 511, the second control valve 512, the pressure sensor 513, the safety valve 514, the valve group 525, the sixth control valve 524, the seventh control valve 541, the eighth control valve 521, the flow sensor 542, the ninth control valve 531, and the tenth control valve 532 are used as actuators to regulate and cut off the temperature and pressure of ammonia fuel in an emergency, so as to ensure the normal operation of the fuel supply system of this application.

[0052] The fuel supply system of this application embodiment includes a control unit 500, a storage unit 100, a pressurization unit 200, and a temperature control unit 400, all connected to the control unit 500. The temperature control unit 400 is connected to the storage unit 100, and the control unit 500 controls the temperature control unit 400 to provide a second working fluid to the storage unit 100. The pressurization unit 200 is connected to the storage unit 100, and the control unit 500 controls the pressurization unit 200 to pressurize the storage unit 100. The storage unit 100 is connected to a fuel engine 600, and the control unit 500 controls the storage unit 100 to provide a first working fluid and output fuel to the fuel engine 600. The fuel supply system of this application uses a control unit 500 to control a pressurization unit 200 to pressurize a storage unit 100, which can overcome the problem of difficult pressure control in the original fuel pump system. It can achieve high-pressure storage of the first working fluid at room temperature and ensure long-term pressure storage. The control unit 500 controls a temperature regulation unit 400 to provide a second working fluid to the storage unit 100, and the control unit 500 controls the storage unit 100 to provide the first working fluid and output fuel to the fuel engine 600, thereby realizing fuel storage and temperature regulation.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0054] The fuel supply system provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A fuel supply system, characterized in that, include: Control unit (500), storage unit (100), pressurization unit (200) and temperature control unit (400) respectively connected to the control unit (500); The storage unit (100) includes a storage tank (110); The pressurization unit (200) includes an air compressor (210), a generator (220), a second buffer tank (230), a booster (240), and a pressurization tank (250) connected in sequence; the pressurization tank (250) is connected to the storage tank (110) and is used to provide a third working fluid to the storage tank (110) for pressurization; The temperature control unit (400) is connected to the storage unit (100), and the control unit (500) is used to control the temperature control unit (400) to provide a second working fluid to the storage unit (100); The pressurization unit (200) is connected to the storage unit (100), and the control unit (500) is used to control the pressurization unit (200) to pressurize the storage unit (100); The storage unit (100) is connected to the fuel engine (600), and the control unit (500) is used to control the storage unit (100) to provide a first working fluid and output fuel to the fuel engine (600); When the pressure in the booster tank (250) is lower than the third preset pressure value, the control unit (500) controls the booster (240) to pressurize the third working fluid in the second buffer tank (230) and deliver it to the booster tank (250); when the pressure in the booster tank (250) is higher than the fourth preset pressure value, the control unit (500) controls the booster (240) and the second buffer tank (230) to stop delivering the third working fluid to the booster tank (250).

2. The fuel supply system according to claim 1, characterized in that, The storage unit (100) includes the storage tank (110), the first heat exchanger (120) and the first buffer tank (130) connected in sequence. The first buffer tank (130) has a supply end (140) at the end away from the first heat exchanger (120), and the supply end (140) is connected to the fuel engine (600).

3. The fuel supply system according to claim 2, characterized in that, The control unit (500) includes: The first control valve (511) is disposed in the storage tank (110). The second control valve (512) is connected between the first buffer tank (130) and the supply end (140); The control unit (500) controls the storage tank (110) to supply the first working fluid to the first heat exchanger (120) through the first control valve (511), and the control unit (500) controls the supply end (140) to supply the fuel to the fuel engine (600) through the second control valve (512).

4. The fuel supply system according to claim 3, characterized in that, The control unit (500) includes: A pressure sensor (513) is disposed in the storage tank (110) and is used to detect the pressure value of the storage tank (110); A valve assembly (525) and a sixth control valve (524) are provided, wherein the valve assembly (525) is disposed between the storage tank (110) and the pressurization tank (250), and the sixth control valve (524) is connected to the valve assembly (525); When the pressure value detected by the pressure sensor (513) is less than the first preset pressure value, the control unit (500) controls the pressurizing tank (250) to pressurize the storage tank (110) by opening the valve group (525) and closing the sixth control valve (524); when the pressure value detected by the pressure sensor (513) is greater than the second preset pressure value, the control unit (500) controls the pressurizing tank (250) to stop pressurizing the storage tank (110) by closing the valve group (525).

5. The fuel supply system according to claim 4, characterized in that, The control unit (500) is used to control the air compressor (210) and the generator (220) to start and replenish the third working fluid to the second buffer tank (230) when the pressure of the second buffer tank (230) is lower than the fifth preset pressure value; the control unit (500) is used to control the air compressor (210) and the generator (220) to shut down to stop supplying the third working fluid to the second buffer tank (230) when the pressure of the second buffer tank (230) is higher than the sixth preset pressure value.

6. The fuel supply system according to claim 5, characterized in that, The control unit (500) also includes a safety valve (514) disposed in the storage tank (110).

7. The fuel supply system according to claim 2, characterized in that, The temperature control unit (400) includes a circulating pump (410), a second heat exchanger (420), and an expansion tank (430). The circulating pump (410) is connected to the second heat exchanger (420). The first heat exchanger (120) is connected to both the circulating pump (410) and the second heat exchanger (420). The expansion tank (430) is connected to the circulating pump (410). The circulating pump (410) is used to transport the second working fluid. The second heat exchanger (420) is used to heat the second working fluid and add it to the first heat exchanger (120). The expansion tank (430) is used to absorb the volume change of the second working fluid.

8. The fuel supply system according to claim 7, characterized in that, The expansion tank (430) is provided with a vent pipe (432), and a gas detection device (431) is installed on the vent pipe (432). The gas detection device (431) is used to detect the concentration of combustible gas in the temperature control unit (400). When the concentration of combustible gas in the temperature control unit (400) is between 20% LEL and 40% LEL, the gas detection device (431) issues an alarm that the supply end (140) stops supplying fuel to the fuel engine (600).

9. The fuel supply system according to claim 7, characterized in that, The control unit (500) further includes a seventh control valve (541), which is disposed in the second heat exchanger (420). The control unit (500) adjusts the opening degree of the seventh control valve (541) to control the temperature of the second working fluid.

10. The fuel supply system according to claim 9, characterized in that, The control unit (500) further includes an eighth control valve (521), which is disposed on the first heat exchanger (120). The control unit (500) controls the temperature of the fuel output by the first heat exchanger (120) by adjusting the opening degree of the eighth control valve (521).

11. The fuel supply system according to claim 10, characterized in that, The control unit (500) further includes a flow sensor (542), which is connected to the temperature control unit (400). The flow sensor (542) is used to detect the flow rate of the second working fluid. When the flow rate of the second working fluid is lower than a first preset flow rate value, the control unit (500) issues an alarm through the flow sensor (542) that the supply end (140) stops supplying the first working fluid to the fuel engine (600).

12. The fuel supply system according to claim 3, characterized in that, It also includes a filling unit (300), which is connected to the control unit (500). The filling unit (300) includes a liquid phase filling pipe (310) and a gas return pipe (320) respectively connected to the storage tank (110). The liquid phase filling pipe (310) is used to fill the storage tank (110) with a fourth working substance, and the gas return pipe (320) is used for the gas return of the fourth working substance.

13. The fuel supply system according to claim 12, characterized in that, The control unit (500) includes a ninth control valve (531) and a tenth control valve (532). The ninth control valve (531) is connected to the liquid phase injection pipe (310), and the tenth control valve (532) is connected to the gas return pipe (320). The control unit (500) is used to control the injection unit (300) to disconnect from the storage unit (100) by closing the ninth control valve (531) and the tenth control valve (532) when the temperature control unit (400) is working on the storage unit (100).

14. The fuel supply system according to claim 12, characterized in that, The first working medium is room temperature pressurized liquid ammonia fuel, the second working medium is a water-ethylene glycol mixture, the fuel is ammonia fuel, the third working medium is nitrogen gas, and the fourth working medium is liquid ammonia.

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