Fuel supply system of marine methanol engine and operation control method

Abstract

The invention discloses a fuel supply system of a marine methanol engine and an operation control method, and can be applied to the technical field of methanol fuel engines. A methanol tank, a preheater, a reversing valve and a link of an intake manifold and a methanol engine are arranged; a methanol tank, a preheater, a reversing valve, an air inlet header pipe, an air inlet manifold and a link of a methanol engine are arranged; a methanol tank, a methanol cracker, a cracked gas and air mixer, a gas inlet header pipe, a gas inlet manifold and a link of a methanol engine are arranged; a methanol tank, a preheater, a reversing valve, an air mixer, an air inlet main pipe, an air inlet manifold and a link of the methanol engine are arranged, so that different fuel supply modes can be provided for the methanol engine; meanwhile, by arranging a connecting link between the exhaust end of the methanol engine and the second input end of the methanol cracker, the waste gas recycling function can be achieved, and the carbon emission is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of methanol fuel engines, and in particular to a fuel supply system and an operation control method for a marine methanol engine. Background Art

[0002] In the relevant technologies, methanol is a low-carbon fuel with a wide source, low cost, and is easy to store and transport in liquid form at room temperature and pressure. It can also realize carbon cycle by synthesizing green methanol from CO2 and green hydrogen, which is of great significance for reducing carbon emissions from ships. Existing methanol engines mainly include gasoline-methanol engines, diesel-methanol engines, natural gas-methanol engines, etc. These methanol engines use the pilot oil mode. Although it can solve the cold start problem of methanol engines, it is difficult to achieve zero carbon emissions and it is difficult to provide different energy supply modes according to the actual operation of the ship.

[0003] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to propose a fuel supply system and operation control method for a marine methanol engine, which can effectively reduce carbon emissions and provide multiple energy supply modes.

[0005] To achieve the above-mentioned purpose, one aspect of an embodiment of the present application provides a fuel supply system for a marine methanol engine, the fuel supply system comprising:

[0006] A methanol tank, wherein the methanol tank is used to store liquid methanol;

[0007] a preheater, wherein an input end of the preheater is connected to a first methanol output end of the methanol tank;

[0008] a reversing valve, wherein an input end of the reversing valve is connected to an output end of the preheater;

[0009] A heater, wherein an input end of the heater is connected to a first output end of the reversing valve;

[0010] An air intake manifold, a first input end of the air intake manifold being connected to an output end of the heater;

[0011] An intake manifold, wherein a first input end of the intake manifold is connected to a second output end of the reversing valve, a second input end of the intake manifold is connected to an output end of the intake manifold, and an output end of the intake manifold is connected to a methanol engine;

[0012] A methanol cracker, wherein a first input end of the methanol cracker is connected to a second output end of the methanol tank, and a second input end of the methanol cracker is used to connect to an exhaust end of the methanol engine;

[0013] A cracked gas and air mixer, wherein a first input end of the cracked gas and air mixer is connected to an output end of the methanol cracker, a second input end of the cracked gas and air mixer is used to receive air, and an output end of the cracked gas and air mixer is connected to a second input end of the intake manifold.

[0014] In some embodiments, the fuel supply system further comprises:

[0015] A supercharger, wherein the first input end of the supercharger is used to receive air, and the first output end of the supercharger is connected to the second input end of the cracked gas and air mixer; the second input end of the supercharger is connected to the exhaust end of the methanol engine, and the second output end of the supercharger is connected to the second input end of the methanol cracker.

[0016] In some embodiments, an intercooler is provided between the first output end of the supercharger and the second input end of the cracked gas and air mixer, and the intercooler is used to reduce the temperature of the air output from the first output end of the supercharger.

[0017] In some embodiments, the fuel supply system further comprises:

[0018] An air filter is used to filter particles of air input into the first input end of the supercharger.

[0019] In some embodiments, the fuel supply system further comprises:

[0020] An injection valve group, the injection valve group is arranged at the first input end of the intake manifold, and is used to control the amount of gaseous methanol entering the intake manifold;

[0021] A manifold injector is disposed at a first input end of the intake manifold and is used to control the amount of liquid methanol entering the intake manifold.

[0022] In some embodiments, the fuel supply system further comprises:

[0023] A cracked gas buffer tank, the input end of which is connected to the output end of the cracker;

[0024] A cracking cooler, wherein the input end of the cracking cooler is connected to the output end of the cracking gas buffer tank, and the output end of the cracking cooler is connected to the first input end of the intake manifold.

[0025] In some embodiments, the fuel supply system further comprises:

[0026] a first stop valve, the first stop valve being arranged between the first output end of the methanol tank and the input end of the preheater, and being used for controlling the amount of methanol delivered from the methanol tank to the preheater;

[0027] a second stop valve, the second stop valve being disposed between the second output end of the methanol tank and the first input end of the methanol cracker, and being used to control the amount of methanol delivered from the methanol tank to the methanol cracker;

[0028] A third stop valve is provided between the output end of the cracking gas buffer tank and the input end of the cracking cooler, and is used to control the amount of methanol delivered from the cracking gas buffer tank to the cracking cooler.

[0029] In some embodiments, the fuel supply system further comprises:

[0030] A methanol cracking flow controller, wherein the methanol cracking flow controller is arranged between the first input end of the methanol cracker and the second stop valve;

[0031] A methanol pump, wherein the input end of the methanol pump is connected to the first output end of the methanol tank through the first stop valve, and the output end of the methanol pump is connected to the input end of the preheater.

[0032] In some embodiments, the fuel supply system further comprises:

[0033] A methanol overflow valve, wherein the input end of the methanol overflow valve is connected to the output end of the methanol pump, the first output end of the methanol overflow valve is connected to the input end of the preheater, and the second output end of the methanol overflow valve is connected to the reflux end of the methanol tank.

[0034] To achieve the above object, another aspect of the embodiment of the present application provides an operation control method for a marine methanol engine, the method comprising the following steps:

[0035] Obtain the current navigation status information of the ship;

[0036] Determining a current load requirement of the ship according to the current sailing condition information;

[0037] Determining a target fuel supply mode of the fuel supply system according to the current load demand, wherein the target fuel supply mode includes a gaseous methanol fuel supply mode, a gaseous methanol and hydrogen mixed fuel supply mode, a liquid methanol and hydrogen mixed fuel supply mode or a liquid methanol fuel supply mode;

[0038] The operation process of the marine methanol engine is controlled according to the target fuel supply mode.

[0039] The embodiments of the present application include at least the following beneficial effects: The present application provides a fuel supply system and operation control method for a marine methanol engine, which can provide a liquid methanol fuel supply mode for the methanol engine by setting a link between a methanol tank, a preheater, a reversing valve, an intake manifold and a methanol engine; a gaseous methanol fuel supply mode can be provided for the methanol engine by setting a link between a methanol tank, a preheater, a reversing valve, an intake manifold, and a methanol engine; a gaseous methanol and hydrogen mixed fuel supply mode can be provided for the methanol engine by setting a link between a methanol tank, a methanol cracker, a cracked gas and an air mixer, an intake manifold, an intake manifold and a methanol engine; a liquid methanol and hydrogen mixed fuel supply mode can be provided for the methanol engine; and at the same time, by setting a connection link between the exhaust end of the methanol engine and the second input end of the methanol cracker, the exhaust gas recycling function can be realized, effectively reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of a fuel supply system for a marine methanol engine provided in an embodiment of the present application;

[0041] Figure 2 It is a flow chart of an operation control method of a marine methanol engine provided in an embodiment of the present application;

[0042] Figure 3 It is a flow chart for judging the fuel supply mode provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application, they are only examples of devices and methods consistent with some aspects of the embodiments of the present application.

[0044] It is understood that the terms "first", "second", etc. used in this application can be used to describe various concepts in this article, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another concept. For example, without departing from the scope of the embodiment of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination".

[0045] The terms "at least one", "multiple", "each", "any", etc. used in this application, at least one includes one, two or more, multiple includes two or more, each refers to each of the corresponding multiple, and any refers to any one of the multiple.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0047] In the relevant technologies, methanol is a low-carbon fuel with a wide source, low cost, and is easy to store and transport in liquid form at room temperature and pressure. It can also realize carbon cycle by synthesizing green methanol from CO2 and green hydrogen, which is of great significance for reducing carbon emissions from ships. Existing methanol engines mainly include gasoline-methanol engines, diesel-methanol engines, natural gas-methanol engines, etc. These methanol engines use the pilot oil mode. Although it can solve the cold start problem of methanol engines, it is difficult to achieve zero carbon emissions and it is difficult to provide different energy supply modes according to the actual operation of the ship.

[0048] In view of this, an embodiment of the present application provides a fuel supply system and operation control method for a marine methanol engine, which can effectively reduce carbon emissions and provide multiple energy supply modes.

[0049] The following is a detailed description of the embodiments of the present application in conjunction with the accompanying drawings:

[0050] Figure 1 is an optional schematic diagram of a fuel supply system for a marine methanol engine provided in an embodiment of the present application, Figure 1The system may include, but is not limited to, a methanol tank 100 , a preheater 110 , a reversing valve 120 , a heater 130 , an intake manifold 140 , an intake manifold 150 , a methanol cracker 160 , and a cracked gas and air mixer 170 . The methanol tank is used to store liquid methanol; the input end of the preheater is connected to the first methanol output end of the methanol tank; the input end of the reversing valve is connected to the output end of the preheater; the input end of the heater is connected to the first output end of the reversing valve; the first input end of the intake manifold is connected to the output end of the heater; the first input end of the intake manifold is connected to the second output end of the reversing valve, the second input end of the intake manifold is connected to the output end of the intake manifold, and the output end of the intake manifold is connected to the methanol engine 180; the first input end of the methanol cracker is connected to the second output end of the methanol tank, and the second input end of the methanol cracker is used to connect the exhaust end of the methanol engine; the first input end of the cracked gas and air mixer is connected to the output end of the methanol cracker, the second input end of the cracked gas and air mixer is used to receive air, and the output end of the cracked gas and air mixer is connected to the second input end of the intake manifold. Specifically, a methanol buffer tank 300 can also be set at the output end of the heater to cache the methanol gas heated and gasified by the heater.

[0051] In the embodiments of the present application, Figure 1 The fuel supply system shown also includes a supercharger 190. Specifically, the first input end of the supercharger is used to receive air, and the first output end of the supercharger is connected to the second input end of the cracked gas and air mixer; the second input end of the supercharger is connected to the exhaust end of the methanol engine, and the second output end of the supercharger is connected to the second input end of the methanol cracker. It can be understood that the supercharger is used to pressurize the input air or the exhaust gas discharged by the engine so that the pressure of the corresponding gas meets the working pressure value of other components.

[0052] In the embodiment of the present application, an intercooler 200 is arranged between the first output end of the supercharger and the second input end of the cracked gas and air mixer, and the intercooler is used to reduce the temperature of the air output from the first output end of the supercharger. The fuel supply system also includes an air filter 210, and the air filter is used to filter particles of the air input to the first input end of the supercharger, thereby reducing the amount of particles in the air entering the supercharger.

[0053] In the embodiments of the present application, Figure 1 The fuel supply system shown also includes an injection valve group 220 and a manifold injector 230. Specifically, the injection valve group is arranged at the first input end of the intake manifold to control the amount of gaseous methanol entering the intake manifold; the manifold injector is arranged at the first input end of the intake manifold to control the amount of liquid methanol entering the intake manifold.

[0054] In the embodiments of the present application, Figure 1The fuel supply system shown also includes a cracked gas buffer tank 240 and a cracking cooler 250. Specifically, the input end of the cracked gas buffer tank is connected to the output end of the cracker; the input end of the cracking cooler is connected to the output end of the cracked gas buffer tank, and the output end of the cracking cooler is connected to the first input end of the intake manifold.

[0055] In the embodiments of the present application, Figure 1 The fuel supply system shown also includes a first stop valve 261, a second stop valve 262 and a third stop valve 263. Specifically, the first stop valve is arranged between the first output end of the methanol tank and the input end of the preheater, and is used to control the amount of methanol delivered from the methanol tank to the preheater; the second stop valve is arranged between the second output end of the methanol tank and the first input end of the methanol cracker, and is used to control the amount of methanol delivered from the methanol tank to the methanol cracker; the third stop valve is arranged between the output end of the cracking gas buffer tank and the input end of the cracking cooler, and is used to control the amount of methanol delivered from the cracking gas buffer tank to the cracking cooler.

[0056] In the embodiments of the present application, Figure 1 The fuel supply system shown also includes a methanol cracking flow controller 270 and a methanol pump 280. Specifically, the methanol cracking flow controller is arranged between the first input end and the second stop valve of the methanol cracker; the input end of the methanol pump is connected to the first output end of the methanol tank through the first stop valve, and the output end of the methanol pump is connected to the input end of the preheater.

[0057] In the embodiments of the present application, Figure 1 The fuel supply system shown also includes a methanol overflow valve 290. Specifically, the input end of the methanol overflow valve is connected to the output end of the methanol pump, the first output end of the methanol overflow valve is connected to the input end of the preheater, and the second output end of the methanol overflow valve is connected to the reflux end of the methanol tank.

[0058] based on Figure 1 The fuel supply system shown in Figure 2 As shown, the embodiment of the present application provides an operation control method for a marine methanol engine, the method includes but is not limited to the following steps:

[0059] Step S410, obtaining the current navigation condition information of the ship;

[0060] Step S420, determining the current load requirement of the ship according to the current sailing condition information;

[0061] Step S430: Determine according to current load demand Figure 1 The target fuel supply mode of the fuel supply system shown, wherein the target fuel supply mode includes a gaseous methanol fuel supply mode, a gaseous methanol and hydrogen mixed fuel supply mode, a liquid methanol and hydrogen mixed fuel supply mode or a liquid methanol fuel supply mode;

[0062] Step S440: Control the operation process of the marine methanol engine according to the target fuel supply mode.

[0063] It can be understood that when the target fuel supply mode is the gaseous methanol fuel supply mode, Figure 1 In the fuel supply system shown, the methanol tank is opened, and after passing through the first stop valve, the methanol is pumped to the preheater through the methanol pump and the methanol overflow valve to preheat the methanol, and the preheated methanol is transported to the heater through the reversing valve to be heated and vaporized, and then passes through the buffer tank to the injection valve group, so that the gaseous methanol is injected into the intake manifold through the injection valve group to form a premixed gas with the air passing through the air filter, supercharger, and intercooler, and then sent to the methanol engine through the intake manifold for combustion, thereby effectively solving the problem of cold start of the engine.

[0064] When the target fuel supply mode is a gaseous methanol and hydrogen mixed fuel supply mode, Figure 1 In the fuel supply system shown, the engine exhaust flows to the methanol cracker through the turbine end of the supercharger, and the methanol passes through the second stop valve and is controlled by the methanol cracking flow controller to control the amount of methanol cracking entering the methanol cracker. The methanol cracking gas enters the cracking gas and air mixer through the buffer tank, the third stop valve, and the cracking cooler, and is mixed with the air after passing through the air filter, the supercharger and the intercooler in the cracking gas and air mixer. The gaseous methanol entering through the intake manifold and the injection valve group forms a methanol-hydrogen mixed fuel, which enters the methanol engine through the intake manifold for combustion, thereby meeting the medium and low load operation requirements.

[0065] When the target fuel supply mode is a liquid methanol and hydrogen mixed fuel supply mode, Figure 1 In the fuel supply system shown, the methanol tank is opened, and the methanol is preheated by the methanol preheater through the first stop valve, the methanol pump, and the methanol overflow valve, and is transported to the manifold alcohol injector through the reversing valve, and is injected into the intake manifold, which can effectively solve the problem of decreased charging efficiency caused by gaseous methanol. The methanol is mixed with the hydrogen-containing fuel formed by the mixture of cracking gas and air in the cracking gas and air mixer in the intake manifold, and is transported to the methanol engine for combustion, which can meet the medium and high load operation requirements.

[0066] When the target fuel supply mode is the liquid methanol fuel supply mode, Figure 1In the fuel supply system shown, the methanol tank is opened, and methanol is preheated through the methanol preheater via the first shut-off valve, the methanol pump, and the methanol overflow valve, and is transported to the manifold alcohol injector through the reversing valve, and is injected into the intake manifold to enter the methanol engine for combustion, thereby improving system stability, reducing knock tendency, and stopping hydrogen-blended combustion. The engine exhaust flows to the methanol cracker through the turbine end of the supercharger, and the methanol passes through the second shut-off valve, and the methanol cracking flow controller controls the amount of methanol cracking entering the methanol cracker. The methanol cracking gas is closed through the buffer tank and the third shut-off valve, and the methanol cracking gas is stored in the buffer tank, thereby being able to meet high-load operation requirements.

[0067] In the embodiment of the present application, since the load required for the ship to sail under different working conditions is different, the embodiment of the present application obtains the current sailing working condition information of the ship, determines the current load requirement of the ship according to the current sailing working condition information, and then determines the target fuel supply mode of the fuel supply system. It can be understood that if Figure 3 As shown, when the power of the current load required by the ship is 0-30% of the full power of the ship, the gaseous methanol fuel supply mode can be selected as the target fuel supply mode of the ship; when the power of the current load required by the ship is 30-50% of the full power of the ship, the gaseous methanol and hydrogen mixed fuel supply mode can be selected as the target fuel supply mode of the ship; when the power of the current load required by the ship is 50-85% of the full power of the ship, the liquid methanol and hydrogen mixed fuel supply mode can be selected as the target fuel supply mode of the ship; when the power of the current load required by the ship is 85-100% of the full power of the ship, the liquid methanol fuel supply mode can be selected as the target fuel supply mode of the ship. It can be seen from this that the implementation of this application can select a suitable fuel supply mode according to the load requirements of different navigation conditions, thereby realizing the cold start of the methanol engine and solving the problem of zero carbon emissions of ignition oil.

[0068] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0069] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0070] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0071] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0072] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0073] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0074] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0075] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store programs.

[0076] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A fuel supply system for a marine methanol engine, characterized in that: The fuel supply system comprises: A methanol tank, wherein the methanol tank is used to store liquid methanol; a preheater, wherein an input end of the preheater is connected to a first methanol output end of the methanol tank; a reversing valve, wherein an input end of the reversing valve is connected to an output end of the preheater; A heater, wherein an input end of the heater is connected to a first output end of the reversing valve; An air intake manifold, a first input end of the air intake manifold being connected to an output end of the heater; An intake manifold, wherein a first input end of the intake manifold is connected to a second output end of the reversing valve, a second input end of the intake manifold is connected to an output end of the intake manifold, and an output end of the intake manifold is connected to a methanol engine; A methanol cracker, wherein a first input end of the methanol cracker is connected to a second output end of the methanol tank, and a second input end of the methanol cracker is used to connect to an exhaust end of the methanol engine; A cracked gas and air mixer, wherein a first input end of the cracked gas and air mixer is connected to an output end of the methanol cracker, a second input end of the cracked gas and air mixer is used to receive air, and an output end of the cracked gas and air mixer is connected to a second input end of the intake manifold.

2. The fuel supply system according to claim 1, characterized in that: The fuel supply system further comprises: A supercharger, wherein the first input end of the supercharger is used to receive air, and the first output end of the supercharger is connected to the second input end of the cracked gas and air mixer; the second input end of the supercharger is connected to the exhaust end of the methanol engine, and the second output end of the supercharger is connected to the second input end of the methanol cracker.

3. The fuel supply system according to claim 2, characterized in that: An intercooler is arranged between the first output end of the supercharger and the second input end of the cracked gas and air mixer, and the intercooler is used to reduce the temperature of the air output from the first output end of the supercharger.

4. The fuel supply system according to claim 2, characterized in that: The fuel supply system further comprises: An air filter is used to filter particles of air input into the first input end of the supercharger.

5. The fuel supply system according to claim 1, characterized in that: The fuel supply system further comprises: An injection valve group, the injection valve group is arranged at the first input end of the intake manifold, and is used to control the amount of gaseous methanol entering the intake manifold; A manifold injector is disposed at a first input end of the intake manifold and is used to control the amount of liquid methanol entering the intake manifold.

6. The fuel supply system according to claim 1, characterized in that: The fuel supply system further comprises: A cracked gas buffer tank, the input end of which is connected to the output end of the cracker; A cracking cooler, wherein the input end of the cracking cooler is connected to the output end of the cracking gas buffer tank, and the output end of the cracking cooler is connected to the first input end of the intake manifold.

7. The fuel supply system according to claim 6, characterized in that: The fuel supply system further comprises: a first stop valve, the first stop valve being arranged between the first output end of the methanol tank and the input end of the preheater, and being used for controlling the amount of methanol delivered from the methanol tank to the preheater; a second stop valve, the second stop valve being disposed between the second output end of the methanol tank and the first input end of the methanol cracker, and being used to control the amount of methanol delivered from the methanol tank to the methanol cracker; A third stop valve is provided between the output end of the cracking gas buffer tank and the input end of the cracking cooler, and is used to control the amount of methanol delivered from the cracking gas buffer tank to the cracking cooler.

8. The fuel supply system according to claim 7, characterized in that: The fuel supply system further comprises: A methanol cracking flow controller, wherein the methanol cracking flow controller is arranged between the first input end of the methanol cracker and the second stop valve; A methanol pump, wherein the input end of the methanol pump is connected to the first output end of the methanol tank through the first stop valve, and the output end of the methanol pump is connected to the input end of the preheater.

9. The fuel supply system according to claim 8, characterized in that: The fuel supply system further comprises: A methanol overflow valve, wherein the input end of the methanol overflow valve is connected to the output end of the methanol pump, the first output end of the methanol overflow valve is connected to the input end of the preheater, and the second output end of the methanol overflow valve is connected to the reflux end of the methanol tank.

10. A method for controlling the operation of a marine methanol engine, characterized in that: The method comprises the following steps: Obtain the current navigation status information of the ship; Determining a current load requirement of the ship according to the current sailing condition information; Determining a target fuel supply mode of the fuel supply system according to any one of claims 1 to 9 according to the current load demand, the target fuel supply mode comprising a gaseous methanol fuel supply mode, a gaseous methanol and hydrogen mixed fuel supply mode, a liquid methanol and hydrogen mixed fuel supply mode or a liquid methanol fuel supply mode; The operation process of the marine methanol engine is controlled according to the target fuel supply mode.

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