Methanol supply system and power plant

Abstract

The application discloses a methanol supply system and a power device. In the methanol supply system, a first conveying pipeline is used for conveying methanol liquid to a waste heat utilization mechanism, the waste heat utilization mechanism is connected with a cooling water output end and an exhaust gas output end of an engine, double waste heat is cooperatively recovered, the pure methanol liquid is preheated by using the waste heat of the cooling water, and is gasified into pure methanol gas, the pure methanol gas is cracked to generate hydrogen by using the waste heat of the exhaust gas in a reformer, a hydrogen-rich gas is formed, and the hydrogen-rich gas is conveyed to the engine through a second conveying pipeline, external energy is not consumed additionally, fuel loss is greatly reduced, the structure is simple and compact, reliability and adaptability are greatly improved, and overall combustion efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of methanol supply technology, and in particular to a methanol supply system and power unit. Background Technology

[0002] Methanol has characteristics such as high auto-ignition temperature, large latent heat of vaporization, low calorific value, and long ignition delay. Direct combustion of methanol in compression ignition engines often results in incomplete combustion and reduced thermal efficiency. To improve methanol combustion, hydrogen can be introduced to enhance in-cylinder combustion. However, hydrogen transportation and storage present challenges. While existing technologies have incorporated methanol cracking to produce hydrogen to assist combustion and improve methanol combustion performance, the utilization of waste heat is limited. The preheating and gasification processes of the hydrogen production feedstock require additional energy consumption, leading to low system energy conversion rates. Furthermore, some pure methanol-to-hydrogen systems have complex pipeline layouts and occupy significant space. Utility Model Content

[0003] To solve at least one of the above-mentioned technical problems, this application provides a methanol supply system and a power unit, and the technical solution adopted is as follows.

[0004] The methanol supply system provided in this application includes: A reformer for converting methanol gas into hydrogen-rich gas; A first delivery pipeline, wherein the first delivery pipeline is used to deliver liquid methanol; A second delivery line is connected to the reformer and is used to deliver hydrogen-rich gas to the engine; Waste heat recovery mechanism, which is used to recover the heat from the engine's cooling water and the engine's exhaust gas to heat the methanol liquid transported in the first delivery pipeline and provide heat to the reformer.

[0005] In some embodiments of this application, the waste heat utilization mechanism includes a heat exchanger, which includes a first heat exchange pipeline and a first storage container. The first storage container is used to receive methanol liquid transported by the first delivery pipeline. The first delivery pipeline is used to introduce cooling water from the delivery engine. The first heat exchange pipeline and the first storage container exchange heat to form methanol gas from the methanol liquid.

[0006] In some embodiments of this application, the reformer includes a second heat exchange pipeline and a second storage container, and the waste heat utilization mechanism includes a third delivery pipeline for introducing engine exhaust gas into the second storage container. The second heat exchange pipeline passes through the interior of the second storage container and is used to receive methanol gas. The second heat exchange pipeline is used to exchange heat with the second storage container to convert methanol gas into hydrogen-rich gas. The second heat exchange pipeline is connected to the second delivery pipeline.

[0007] In some embodiments of this application, the first heat exchange pipeline and / or the second heat exchange pipeline are configured as coils or tube bundles. In some embodiments of this application, the methanol supply system includes an air delivery line and a mixer, the mixer being disposed in the second delivery line and the air delivery line being connected to the mixer, the mixer being used to mix hydrogen-rich gas and air.

[0008] In some embodiments of this application, the methanol supply system includes a fourth delivery line for delivering liquid methanol to the engine, the fourth delivery line being independent of the first delivery line.

[0009] In some embodiments of this application, the methanol supply system includes a fifth delivery pipeline, which is connected to one pipe of a three-way valve. The other two pipes of the three-way valve are respectively connected to the first delivery pipeline and the fourth delivery pipeline. The fifth delivery pipeline is used to deliver liquid methanol. A heater is provided on the fifth delivery pipeline for preheating the liquid methanol.

[0010] In some embodiments of this application, a filter and a pressure transmitter are sequentially provided on the fifth delivery pipeline along the direction of methanol liquid flow, and the filter and pressure transmitter are located upstream of the heater.

[0011] This application also provides a power unit, including an engine and a methanol supply system as described above.

[0012] In some embodiments of this application, the engine is provided with a methanol common rail and an intake manifold, wherein the methanol common rail is used to receive liquid methanol and the intake manifold is used to receive at least hydrogen-rich gas.

[0013] This application has at least the following beneficial effects: In the methanol supply system of this application, the first conveying pipeline transports liquid methanol to the waste heat utilization mechanism. The waste heat utilization mechanism is connected to both the cooling water output end and the exhaust gas output end of the engine, realizing the synergistic recovery of dual waste heat. First, the waste heat of the cooling water is used to preheat and vaporize the pure liquid methanol into pure methanol gas. Then, in the reformer, the waste heat of the exhaust gas is used to drive the pure methanol gas to crack and produce hydrogen, forming hydrogen-rich gas, which is then transported to the engine through the second conveying pipeline. No additional external energy is required, which greatly reduces fuel consumption. The structure is simplified and compact, and the reliability and adaptability are greatly improved, thereby improving the overall combustion efficiency.

[0014] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0015] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0016] Figure 1 This is a schematic diagram of a methanol supply system in one embodiment of this application.

[0017] Reference numerals: First delivery pipeline 100; Solenoid valve 110; Liquid flow controller 120; Second delivery pipeline 200; Air delivery pipeline 210; Hydrogen sensor 220; Heat exchanger 300; first input terminal 310; first output terminal 320; second input terminal 330; second output terminal 340; thermometer 350; Restorer 400; Third input terminal 410; Third output terminal 420; Fourth input terminal 430; Fourth output terminal 440; Engine 500; Methanol common rail 510; Coolant tank 520; Fourth delivery pipeline 600; Fifth delivery pipeline 700; methanol tank 710; shut-off valve 720; Y-type filter 730; T-type filter 740; pressure transmitter 750; methanol pump 760; ball valve 770; heater 780; temperature transmitter 790; Three-way valve 800. Detailed Implementation

[0018] The following is combined Figure 1 The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship 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.

[0020] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Combination Figure 1 As shown, the methanol supply system provided in this application includes: Reformer 400 is used to convert methanol gas into hydrogen-rich gas. The first conveying pipeline 100 is used to convey methanol liquid; The second conveying pipeline 200 is used to convey hydrogen-rich gas; The waste heat recovery mechanism is used to recover the heat from the cooling water of the engine 500 and the heat from the exhaust gas of the engine 500 to heat the methanol liquid transported by the first delivery pipeline 100 and to provide heat to the reformer 400.

[0024] The first delivery pipeline 100 is connected to the waste heat recovery unit and is used to deliver methanol liquid to the waste heat recovery unit. The methanol liquid delivered to the waste heat recovery unit provides sufficient raw materials for the subsequent preparation of hydrogen-rich gas. The waste heat recovery unit uses the hot cooling water and exhaust gas of the engine 500 to heat the methanol liquid. The methanol liquid first forms methanol gas in the waste heat recovery unit, and then further generates hydrogen-rich gas with hydrogen as the main component through a reforming reaction. The hydrogen-rich gas in the waste heat recovery unit is delivered to other input terminals of the engine 500 through the second delivery pipeline 200 for the engine 500 to use the methanol liquid and hydrogen-rich gas. After utilizing the heat of the hot cooling water, the waste heat recovery unit delivers the cold cooling water to the engine 500 for reuse; after utilizing the heat of the exhaust gas, the exhaust gas is treated and then discharged into the atmosphere.

[0025] In the methanol supply system of this application, the first conveying pipeline 100 conveys liquid methanol to the waste heat utilization mechanism. The waste heat utilization mechanism is connected to both the cooling water output end and the exhaust gas output end of the engine 500, realizing the synergistic recovery of dual waste heat. First, the waste heat of the cooling water is used to preheat and vaporize the pure liquid methanol into pure methanol gas. Then, in the reformer 400, the waste heat of the exhaust gas is used to drive the pure methanol gas to crack and produce hydrogen, forming hydrogen-rich gas, which is then conveyed to the engine 500 through the second conveying pipeline 200. No additional external energy is required, which greatly reduces fuel consumption. The structure is simplified and compact, and the reliability and adaptability are greatly improved, thus improving the overall combustion efficiency.

[0026] Along the methanol liquid delivery path, the first delivery pipeline 100 is equipped with a solenoid valve 110, a liquid flow controller 120, and a pressure transmitter. The solenoid valve 110 is used to switch on and off the methanol liquid delivery, the liquid flow controller 120 is used to control the delivery speed of the methanol liquid to ensure the safety of the delivery process, and the pressure transmitter is used to monitor the pipeline pressure.

[0027] In some embodiments, the waste heat utilization mechanism includes a heat exchanger 300, which includes a first heat exchange pipeline and a first storage container. The first storage container is used to receive methanol liquid transported by a first delivery pipeline 100. The first delivery pipeline is used to introduce cooling water from the delivery engine 500. The first heat exchange pipeline and the first storage container exchange heat to form methanol gas from the methanol liquid.

[0028] The first storage container is a shell, and the first storage container is provided with a first input terminal 310 and a first output terminal 320. The first input terminal 310 is connected to the first delivery pipeline 100, and the first output terminal 320 is used to output methanol gas. The first heat exchange pipeline is provided with a second input terminal 330 and a second output terminal 340. The second input terminal 330 is used to receive hot cooling water from the engine 500, and the second output terminal 340 is used to output cold cooling water to the engine 500.

[0029] The first heat exchange pipe is located inside the first storage container and is used to circulate cooling water. The output end of the cooling water from engine 500 is connected to the second input end 330. Hot cooling water enters the first heat exchange pipe from the second input end 330 and then exits from the second output end 340 to the cooling water tank 520. The first storage container is sealed inside and serves as the container and heat exchange area for methanol liquid, with the space inside the pipe completely isolated from the space inside the shell. Methanol solution is input into the first storage container from the first input end 310. The methanol solution absorbs heat from the cooling water to form methanol gas, which is output through the first output end 320 on the first storage container and used for subsequent reforming reactions. The first heat exchange pipe and the first storage container form independent spaces inside the pipe and inside the shell, and the cooling water and methanol liquid are physically isolated throughout the process, achieving efficient recovery of waste heat from engine 500 without consuming additional external energy. A thermometer 350 is installed inside the heat exchanger 300 for temperature monitoring.

[0030] In some embodiments, the reformer 400 includes a second heat exchange pipe and a second storage container, and the waste heat utilization mechanism includes a third delivery pipe for introducing exhaust gas from the engine 500 into the second storage container. The second heat exchange pipe passes through the interior of the second storage container and is used to receive methanol gas. The second heat exchange pipe is used to exchange heat with the second storage container to convert the methanol gas into hydrogen-rich gas. The second heat exchange pipe is connected to the second delivery pipe 200.

[0031] The second heat exchange pipeline is provided with a third input terminal 410 and a third output terminal 420. The second storage container is a shell and is provided with a fourth input terminal 430 and a fourth output terminal 440. The third input terminal 410 is connected to the first output terminal 320, and the third output terminal 420 is connected to the second delivery pipeline 200. The fourth input terminal 430 is used to receive exhaust gas from the engine 500. The reformer 400 is used to use the heat of the exhaust gas to drive the methanol gas to undergo a reforming reaction to produce hydrogen-rich gas. The fourth output terminal 440 is used to output the exhaust gas.

[0032] The second heat exchange pipeline is located inside the second storage container. The second heat exchange pipeline of the reformer 400 is used to transport methanol gas and facilitate its cracking reaction. The second storage container of the reformer 400 is a sealed, high-temperature resistant structure. The second storage container is used to contain exhaust gas. The space inside the second storage container is completely isolated from the second heat exchange pipeline. Exhaust gas enters the second storage container from the fourth input end 430. The third input end 410 of the second heat exchange pipeline receives methanol gas from the first output end 320. The exhaust gas heats the internal pipeline, achieving the cracking reaction of the methanol gas, decomposing it into hydrogen-rich gas, mainly composed of hydrogen and carbon monoxide. The hydrogen-rich gas is transported from the third output end 420 to the second transport pipeline 200. The exhaust gas is independent of the methanol gas and hydrogen-rich gas. The used exhaust gas is output from the fourth output end 440 and treated before being discharged into the atmosphere. The reformer 400 utilizes the high-temperature waste heat from the engine 500 exhaust to drive the cracking reaction, eliminating the need for additional fuel, electricity, or other external energy sources, thus maximizing the value of the engine's waste heat.

[0033] In some other embodiments, the reformer 400 includes a separate pipeline for the reforming reaction to take place, which can be heated by a waste heat recovery mechanism.

[0034] In some embodiments, the first heat exchange pipeline and / or the second heat exchange pipeline are provided with coils or tube bundles for heat exchange.

[0035] For example, the first heat exchange pipeline of heat exchanger 300 is equipped with a spiral coil. The diameter of the coil matches the shell-side space of the heat exchanger, and a continuous spiral structure is adopted. Cooling water flows inside the coil, and methanol liquid surrounds the coil inside the shell, increasing the heat exchange contact area and improving heat transfer efficiency. The internal pipeline of heat exchanger 300 is also equipped with a tube bundle, which can also increase the heat exchange contact area.

[0036] For example, the second heat exchange pipeline within the reformer 400 is configured as a parallel tube bundle. This bundle consists of multiple uniformly sized tubes arranged closely with consistent spacing. Both ends are welded and fixed to the reformer 400 shell, forming a stable tube-side channel and increasing the heat exchange contact area. Methanol gas flows within the tube bundle, while exhaust gas flows around it within the shell. The parallel structure of the tube bundle ensures that the heat from the exhaust gas is evenly transferred to each tube, resulting in a uniform temperature within the tubes. Using coils in the internal piping of the reformer 400 can also increase the heat exchange contact area.

[0037] When the coils in heat exchanger 300 are used in combination with the tube bundles in reformer 400, the efficiency of methanol liquid forming hydrogen-rich gas is improved, and the utilization efficiency of waste heat from engine 500 is increased.

[0038] In some embodiments, the methanol supply system includes an air delivery line 210 and a mixer. The mixer is disposed in a second delivery line 200, and the air delivery line 210 is connected to the mixer. The mixer is used to mix hydrogen-rich gas and air. The air delivery line 210 is used at least to provide the oxygen required for heating the hydrogen-rich gas, and oxygen is required for the combustion of the hydrogen-rich gas. The air delivery line 210 is used at least to provide the oxygen required for heating the hydrogen-rich gas and to ensure sufficient oxygen during combustion. The mixer is connected to the second delivery line 200. The air delivery line 210 can deliver air to the mixer via a fan. The mixer mixes the hydrogen-rich gas and air before inputting it into the intake manifold, and then outputting it from the intake manifold for use by the engine.

[0039] A hydrogen sensor 220 is installed on the second delivery pipeline 200 to monitor the hydrogen concentration in the second delivery pipeline 200 in real time. A shut-off valve is also installed on the second delivery pipeline 200 for emergency shut-off. In conjunction with the warning signal from the hydrogen sensor, when hydrogen leakage, excessive concentration, or system failure such as abnormal pressure or engine shutdown is detected, the shut-off valve closes quickly, cutting off the supply of hydrogen-rich mixture to the second delivery pipeline.

[0040] In some embodiments, the methanol supply system includes a fourth delivery line 600 for delivering liquid methanol to the engine 500. The fourth delivery line 600 is independent of the first delivery line 100. The fourth delivery line 600 is used to deliver liquid methanol to start the engine 500 first, and then utilize the waste heat of the engine 500 to carry out a methanol reforming reaction.

[0041] In some embodiments, the methanol supply system includes a fifth delivery pipeline 700, which is connected to one pipe of a three-way valve 800. The other two pipes of the three-way valve 800 are respectively connected to a first delivery pipeline 100 and a fourth delivery pipeline 600. The fifth delivery pipeline 700 is used to deliver liquid methanol. A heater 780 is provided on the fifth delivery pipeline 700 for preheating the liquid methanol.

[0042] The methanol liquid supply is delivered to the first delivery pipeline 100 and the fourth delivery pipeline 600 via pipelines. Before being delivered to the first delivery pipeline 100 and the fourth delivery pipeline 600, the methanol liquid is first heated by the heater 780. Preheating the pure methanol liquid reduces its viscosity and solves the problems of poor pure methanol supply and poor spray atomization effect in low-temperature environments.

[0043] Methanol tank 710 serves as the supply end for liquid methanol. After being heated by heater 780, the methanol is diverted by three-way valve 800, supplying preheated liquid methanol to two first delivery pipelines 100 respectively, simplifying the pipeline and saving space. A temperature transmitter 790 is installed downstream of heater 780 to monitor the temperature of the liquid methanol at the outlet of heater 780 in real time.

[0044] In some embodiments, a filter and a pressure transmitter 750 are sequentially provided on the fifth delivery pipeline 700 along the methanol liquid flow direction, and the filter and pressure transmitter 750 are located upstream of the heater 780.

[0045] Specifically, the fifth delivery pipeline 700 outputs methanol liquid from the methanol tank 710. Along the direction of methanol liquid delivery, the following components are sequentially installed: methanol tank 710, shut-off valve 720, Y-type filter 730, T-type filter 740, pressure transmitter 750, methanol pump 760, another pressure transmitter 750, ball valve 770, heater 780, and temperature transmitter 790. Methanol liquid is output from the temperature transmitter 790 to the three-way valve 800. The shut-off valve 720 acts as the system's main switch, controlling the opening and closing of the fifth delivery pipeline 700. The Y-type filter 730 performs preliminary filtration of the methanol liquid, filtering out large particulate impurities. The T-type filter 740 finely filters out minute impurities in the methanol liquid. The upstream pressure transmitter 750 monitors the pipeline pressure. After pressure monitoring by the upstream pressure transmitter 750, the methanol liquid is delivered by the methanol pump 760, ensuring stable delivery. The downstream pressure transmitter 750 is located downstream of the methanol pump 760, providing data support for methanol pump speed regulation and overpressure protection. The ball valve 770 is used for secondary shut-off and flow fine-tuning, adjusting the methanol liquid flow rate according to supply requirements. The fifth delivery pipeline 700 ensures that the methanol liquid delivered to the two first delivery pipelines 100 is clean, has stable pressure, and is at a suitable temperature.

[0046] This application also provides a power unit including the methanol supply system described above. The power unit provided by this application, utilizing the aforementioned methanol supply system, can effectively utilize the cooling water and waste heat from the engine 500, thereby improving waste heat utilization efficiency.

[0047] In some embodiments, the engine 500 is provided with a methanol common rail 510 and an intake manifold, the methanol common rail 510 being used to receive methanol liquid and the intake manifold being used to receive at least hydrogen-rich gas.

[0048] Engine 500 is equipped with a methanol common rail 510 and methanol injectors. The input end of the methanol common rail 510 is connected to the output end of a first delivery pipeline 100 and is used to receive liquid methanol. The output end of the methanol common rail 510 is connected to the methanol injectors. The methanol common rail 510 buffers pressure fluctuations during fuel delivery, ensuring uniform fuel supply to each injector, improving the stability and accuracy of methanol fuel supply, reducing incomplete combustion, adapting to multi-heat-source driven reforming systems, and ensuring the operating efficiency of engine 500. The number of methanol injectors is the same as that of engine 500 cylinders. The intake manifold is used to receive a mixture of hydrogen-rich gas and air, which is then supplied to engine 500 to ensure sufficient oxygen during the combustion of hydrogen-rich gas.

[0049] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A methanol supply system, characterized in that, include: A reformer for converting methanol gas into hydrogen-rich gas; A first delivery pipeline, wherein the first delivery pipeline is used to deliver liquid methanol; A second delivery line is connected to the reformer and is used to deliver hydrogen-rich gas to the engine; Waste heat recovery mechanism, which is used to recover the heat from the engine's cooling water and the engine's exhaust gas to heat the methanol liquid transported in the first delivery pipeline and provide heat to the reformer.

2. The methanol supply system according to claim 1, characterized in that: The waste heat utilization mechanism includes a heat exchanger, which includes a first heat exchange pipeline and a first storage container. The first storage container is used to receive methanol liquid transported by the first delivery pipeline. The first delivery pipeline is used to introduce cooling water from the delivery engine. The first heat exchange pipeline and the first storage container exchange heat to form methanol gas from the methanol liquid.

3. The methanol supply system according to claim 2, characterized in that: The reformer includes a second heat exchange pipeline and a second storage container. The waste heat utilization mechanism includes a third delivery pipeline. The third delivery pipeline is used to pass the engine exhaust gas into the second storage container. The second heat exchange pipeline passes through the interior of the second storage container and is used to receive methanol gas. The second heat exchange pipeline is used to exchange heat with the second storage container to convert the methanol gas into hydrogen-rich gas. The second heat exchange pipeline is connected to the second delivery pipeline.

4. The methanol supply system according to claim 3, characterized in that: The first heat exchange pipeline and / or the second heat exchange pipeline are configured as coils or tube bundles.

5. The methanol supply system according to claim 3, characterized in that: The methanol supply system includes an air delivery pipeline and a mixer. The mixer is located in the second delivery pipeline and the air delivery pipeline is connected to the mixer. The mixer is used to mix hydrogen-rich gas and air.

6. The methanol supply system according to claim 1, characterized in that: The methanol supply system includes a fourth delivery pipeline for delivering liquid methanol to the engine, and the fourth delivery pipeline is independent of the first delivery pipeline.

7. The methanol supply system according to claim 6, characterized in that: The methanol supply system includes a fifth delivery pipeline, which is connected to one pipe of a three-way valve. The other two pipes of the three-way valve are respectively connected to the first delivery pipeline and the fourth delivery pipeline. The fifth delivery pipeline is used to deliver liquid methanol. A heater is installed on the fifth delivery pipeline to preheat the liquid methanol.

8. The methanol supply system according to claim 7, characterized in that: A filter and a pressure transmitter are sequentially installed along the methanol liquid flow direction on the fifth delivery pipeline, and the filter and pressure transmitter are located upstream of the heater.

9. A power unit, characterized in that, Includes an engine and a methanol supply system as described in any one of claims 1 to 8.

10. The power unit according to claim 9, characterized in that: The engine is equipped with a methanol common rail and an intake manifold. The methanol common rail is used to receive liquid methanol, and the intake manifold is used to receive at least hydrogen-rich gas.

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