A methanol-fuel dual-fuel system

Abstract

This invention belongs to the field of marine propulsion technology, and particularly relates to a methanol-fuel dual-fuel system, comprising a methanol fuel common tank, a methanol fuel switching valve assembly, a methanol delivery pump assembly, an FVT unit, a methanol dual-fuel generator set, and a fuel delivery pump assembly. The methanol fuel switching valve assembly includes a main input channel and a main output channel, with several first connecting branch pipes between the main input channel and the main output channel. The input end of the methanol fuel common tank is connected to the main output channel or an external refueling station, and the output end of the methanol fuel common tank is connected to the first connecting branch pipes. The methanol fuel switching valve assembly is connected to both the fuel delivery pump assembly and the methanol delivery pump assembly. The methanol delivery pump assembly is connected to the FVT unit, and both the FVT unit and the fuel delivery pump assembly are connected to the methanol dual-fuel generator set. By using this invention, the mode switching of the methanol dual-fuel generator set can be responded to quickly, meeting the requirements for flexibility and timeliness in methanol and fuel supply.

Description

Technical Field

[0001] This invention belongs to the field of marine power technology, and particularly relates to a methanol fuel dual-fuel system. Background Technology

[0002] With increasingly stringent environmental regulations in the shipping industry, traditional marine fuel oil combustion easily produces pollutants such as sulfur oxides, nitrogen oxides, and particulate matter, failing to meet low-emission navigation requirements. Methanol offers advantages such as being clean, low-carbon, producing fewer combustion product pollutants, and being safe for storage and transportation. Therefore, methanol dual-fuel generator sets, which use fuel oil for ignition and methanol as the main fuel, are gradually becoming the mainstream configuration for ship generator sets. They can flexibly switch between dual-fuel and single-fuel operating modes according to navigation conditions, balancing operating costs and environmental performance indicators.

[0003] However, existing methanol-fuel dual-fuel systems with methanol dual-fuel generator sets as the core generally adopt independent compartments for methanol and fuel oil, with two sets of fuel pipelines being independent of each other and valve groups being scattered. The pipeline layout is complex and there are many valves, which not only occupies a lot of space in the ship's cabin, but also increases the difficulty of pipeline laying and equipment maintenance. It cannot efficiently respond to the mode switching of the methanol dual-fuel generator set and supply the required combustion medium to the dual-fuel generator set in a timely manner. Summary of the Invention

[0004] The purpose of this invention is to provide a methanol-fuel dual-fuel system designed to quickly respond to mode switching of methanol dual-fuel generator sets and meet the requirements for flexibility and timeliness in methanol and fuel supply.

[0005] To achieve the above objectives, this invention provides a methanol-fuel dual-fuel system, comprising a methanol-fuel shared compartment, a methanol-fuel switching valve assembly, a methanol delivery pump assembly, an FVT unit, a methanol dual-fuel generator set, and a fuel delivery pump assembly, wherein: The methanol fuel switching valve assembly includes a main input channel and a main output channel, and a plurality of first connecting branch pipes are provided between the main input channel and the main output channel; The input end of the methanol fuel tank is connected to the main output channel or an external refueling station, and is used to refuel fuel or methanol into the methanol fuel tank. The output end of the methanol fuel shared compartment is connected to the first connecting branch pipe, and is used to deliver fuel or methanol to the methanol fuel switching valve group. The methanol fuel switching valve group is connected to the fuel delivery pump group and the methanol delivery pump group respectively, and is used to switch the pipeline path and selectively conduct the fuel delivery circuit or the methanol delivery circuit. The methanol delivery pump unit is connected to the FVT unit and is used to stabilize, heat and filter the pressurized methanol. Both the FVT unit and the fuel delivery pump set are connected to the methanol dual-fuel generator set, supplying methanol and fuel oil to the methanol dual-fuel generator set respectively.

[0006] As an optional embodiment of the present invention, the methanol dual-fuel system further includes a methanol venting chamber, which is connected to the methanol delivery pump group, the FVT unit and the methanol dual-fuel generator group respectively, and is used to collect residual, depressurized and recirculated methanol waste liquid in the methanol delivery pump group, the FVT unit and the methanol dual-fuel generator group.

[0007] As an optional embodiment of the present invention, a fuel tank and a fuel supply pump set are provided between the fuel delivery pump set and the methanol dual-fuel generator set, wherein: The output end of the fuel delivery pump unit is connected to the fuel tank and is used to deliver fuel to the fuel tank; the fuel tank is connected to the input end of the fuel supply pump unit, and the output end of the fuel supply pump unit is connected to the methanol dual-fuel generator set and is used to pump the fuel in the fuel tank to the methanol dual-fuel generator set.

[0008] As an optional embodiment of the present invention, the methanol fuel switching valve group further includes a second connecting branch pipe and a third connecting branch pipe, both of which are located between the main input pipe and the main output pipe. The second connecting branch pipe is connected to the input end of the methanol delivery pump group, and the third connecting branch pipe is connected to the input end of the FVT unit.

[0009] As an optional embodiment of the present invention, one end of each of the first connecting branch pipe, the second connecting branch pipe, and the third connecting branch pipe is provided with an input control branch valve for controlling the conduction relationship between the first connecting branch pipe, the second connecting branch pipe, and the third connecting branch pipe and the total input channel; the other end of each of the first connecting branch pipe, the second connecting branch pipe, and the third connecting branch pipe is provided with an output control branch valve for controlling the conduction relationship between the first connecting branch pipe, the second connecting branch pipe, and the third connecting branch pipe and the total output channel.

[0010] As an optional embodiment of the present invention, one end of the total output pipe is provided with a methanol control valve for controlling the connection between the total output pipe and the output end of the methanol delivery pump group; the other end of the total output pipe is also provided with a fuel filling control valve for controlling the connection between the total output pipe and the output end of the fuel delivery pump group; one end of the total input pipe is provided with a fuel control valve for controlling the connection between the total input pipe and the input end of the fuel delivery pump group.

[0011] As an optional embodiment of the present invention, the input control valves of the first connecting branch pipe and the second connecting branch pipe are opened simultaneously, so that the methanol in the methanol fuel tank flows sequentially through the first connecting branch pipe, the main input pipe, and the second connecting branch pipe, and is delivered to the input end of the methanol delivery pump unit; simultaneously, the methanol control main valve and the output control valve of the third connecting branch pipe are opened, so that the methanol pumped by the output end of the methanol delivery pump unit flows sequentially through the main output pipe and the third connecting branch pipe, and is delivered to the input end of the FVT unit.

[0012] As an optional embodiment of the present invention, the methanol delivery pump set includes two methanol delivery pumps connected in parallel. Each methanol delivery pump has an inlet isolation valve, a Y-type filter, a differential pressure detection component, and a nitrogen purging circuit sequentially installed at its suction end. Each methanol delivery pump has a check valve and an outlet isolation valve sequentially installed at its discharge end. The methanol delivery pump set is also equipped with a safety valve and a pressure relief return pipeline. The outlet of the safety valve is connected to the methanol release chamber.

[0013] As an optional embodiment of the present invention, the output end of the methanol release chamber is connected to a first connecting branch pipe for conveying the methanol release chamber to the methanol fuel switching valve group for recycling.

[0014] As an optional embodiment of the present invention, a fuel conditioning unit and a filter adjustment unit are further provided between the methanol dual-fuel generator set and the fuel supply pump set, wherein: The fuel conditioning unit includes a heat exchanger, and the inlet and outlet of the heat exchanger are equipped with isolation valves, bypass valve groups, and pressure and temperature monitoring elements. The filtration and regulation unit includes a dual-channel switching valve group, a dual-filter assembly, and a pressure regulating valve.

[0015] The above-mentioned technical solutions in a methanol-fuel dual-fuel system provided by the embodiments of the present invention have at least one of the following technical effects: This application provides a methanol-fuel dual-fuel system. By integrating a shared methanol-fuel compartment with a methanol-fuel switching valve assembly and multiple branch pipe pathways, it achieves the functions of switchable fuel storage medium and rapid adaptation of the supply circuit. The shared methanol-fuel compartment allows for selective loading of methanol or fuel oil. Combined with the integrated switching pipeline consisting of a first connecting branch pipe, a main input channel, and a main output channel, the fuel supply circuit can be quickly switched according to the ship's navigation conditions without modifying the pipeline structure, significantly shortening the fuel mode switching time and effectively improving the flexibility and adaptability of dual-fuel supply.

[0016] By adding a second and third connecting branch pipe within the switching valve assembly, and installing corresponding input control branch valves, output control branch valves, and a master control valve, independent and controllable rapid connection of the methanol suction circuit and the methanol supply circuit can be achieved. By synchronously opening and closing the corresponding branch control valves and the master valve, a dedicated methanol supply path can be quickly established for the "shared compartment, methanol transfer pump set, FVT unit, and generator set," enabling rapid suction, pressurization, and precise supply of methanol, ensuring the timeliness of methanol fuel supply, and meeting the operational requirements of rapid start-up and shutdown and load switching of the generator set.

[0017] By establishing an independent fuel delivery link, coupled with fuel tanks, fuel supply pump sets, fuel conditioning units, and filtration and regulation units, stable pressure, constant temperature, and high-precision filtration and regulation of the fuel medium are achieved. By installing parallel methanol delivery pump sets with filtration, differential pressure detection, nitrogen purging, and pressure relief and reflux structures, the methanol delivery process is made safe and controllable, faults are monitorable, and pipelines are protected. By configuring a methanol venting chamber and connecting it to the methanol delivery pump sets, FVT unit, methanol dual-fuel generator set, and switching valve group pipelines, unified collection and recycling of residual methanol, pressure relief medium, and reflux medium are achieved for reuse.

[0018] Ultimately, through the overall modular integrated structure and the cooperation of multi-way controllable valve group pipelines, the rapid switching, flexible adaptation and stable delivery of methanol and fuel oil supply can be achieved, meeting the timeliness requirements of methanol dual-fuel generator set for multi-condition operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a system block diagram of a methanol-fuel dual-fuel system according to the present invention.

[0021] Figure 2 This is a schematic diagram of a methanol fuel switching valve assembly in a methanol fuel dual-fuel system according to the present invention.

[0022] Figure 3 This is a schematic diagram of a methanol delivery pump unit for a methanol-fuel dual-fuel system according to the present invention.

[0023] Figure 4 This is a schematic diagram of the fuel conditioning unit of a methanol fuel dual-fuel system according to the present invention.

[0024] Figure 5This is a schematic diagram of the filter adjustment unit of a methanol fuel dual-fuel system according to the present invention. Attached image description: 1. Main input pipe; 2. Main output pipe; 3. First connecting branch pipe; 4. Output control branch valve; 5. Input control branch valve; 6. Fuel control main valve; 7. Methanol control main valve; 8. Fuel filling control valve; 9. Second connecting branch pipe; 10. Third connecting branch pipe; 11. Input end of methanol transfer pump unit; 12. Output end of methanol transfer pump unit; 13. Input end of FVT unit; 3301. Inlet main isolation valve of methanol transfer pump; 3302. Inlet branch isolation valve of methanol transfer pump; 14. Y-type filter; 15. Differential pressure detection assembly; 16. Centrifugal pump; 17. Outlet check valve of methanol transfer pump. Valves; 1801, Main isolation valve at the outlet of the methanol transfer pump; 1802, Branch isolation valve at the outlet of the methanol transfer pump; 19, Main isolation valve of the methanol transfer pump group; 2001, Pneumatic valve at the nitrogen inlet; 2002, Nitrogen check valve; 21, Safety valve of the methanol transfer pump; 22, Pressure relief and return pipeline; 23, Heat exchanger; 24, Pressure transmitter; 25, Temperature transmitter; 26, Bypass isolation valve of the fuel conditioning unit; 27, Isolation valve of the fuel conditioning unit; 28, Isolation valve of the fuel transfer pipeline; 29, Pressure regulating valve; 30, Dual-path switching valve group; 31, Fuel filter; 32, Pressure and temperature monitoring instruments. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, 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 intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention 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. Therefore, they should not be construed as limitations on the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0030] In specific embodiments of the present invention, such as Figure 1 As shown, a methanol-fuel dual-fuel system is provided, including a methanol-fuel shared compartment, a methanol-fuel switching valve assembly, a methanol transfer pump assembly, an FVT unit, a methanol dual-fuel generator set, a fuel transfer pump assembly, a methanol venting compartment, a fuel tank, and a fuel supply pump assembly, wherein: The input end of the methanol fuel tank is connected to the methanol fuel switching valve group, which is used to add fuel oil or methanol into the methanol fuel tank. The output end of the methanol fuel shared compartment is connected to the methanol fuel switching valve group, which is used to deliver fuel oil or methanol to the methanol fuel switching valve group. The methanol fuel switching valve group is connected to the fuel delivery pump group and the methanol delivery pump group respectively, and is used to switch the pipeline path and selectively conduct the fuel delivery circuit or the methanol delivery circuit. The output of the methanol transfer pump unit is connected to the input of the FVT unit, which is used to stabilize, heat and filter the pressurized methanol; the output of the FVT unit is connected to the methanol dual-fuel generator set to supply methanol to the methanol dual-fuel generator set.

[0031] The output end of the fuel delivery pump unit is connected to the fuel tank and is used to deliver fuel to the fuel tank; the fuel tank is connected to the input end of the fuel supply pump unit, and the output end of the fuel supply pump unit is connected to the methanol dual-fuel generator set and is used to pump the fuel in the fuel tank to the methanol dual-fuel generator set.

[0032] The methanol venting chamber is connected to the methanol transfer pump unit, the FVT unit, and the methanol dual-fuel generator set, and is used to collect residual, depressurized, and recirculated methanol waste liquid in the methanol transfer pump unit, the FVT unit, and the methanol dual-fuel generator set.

[0033] Preferably, the output end of the methanol release chamber is connected to a first connecting branch pipe for conveying the methanol release chamber to the methanol fuel switching valve group for recycling.

[0034] Reference Figure 2The methanol fuel switching valve assembly includes a main input pipe 1 and a main output pipe 2. Multiple sets of first connecting branch pipes 3, a set of second connecting branch pipes 9, and a set of third connecting branch pipes 10 are installed between the main input pipe 1 and the main output pipe 2. Each connecting branch pipe is equipped with an independent input control branch valve 5 and an output control branch valve 4. Together with the methanol control main valve 7, the fuel control main valve 6, and the fuel filling control valve 8, it forms a complete and controllable pipeline system, enabling flexible and stable switching between diesel and methanol supply and medium transportation, meeting the actual operational needs of the ship.

[0035] Preferred, refer to Figure 2 In a specific embodiment of the present invention, five sets of first connecting branch pipes 3 are provided. Each first connecting branch pipe 3 is a three-way connecting branch pipe, and the middle connecting part of each first connecting branch pipe 3 is respectively connected to the methanol / fuel shared compartment for supplying fuel or methanol to the methanol fuel switching valve group. Each first connecting branch pipe is provided with an input control branch valve 4 and an output control branch valve 5 at its two ends. Opening the output control branch valve 5 of the first connecting branch pipe 3 connects the first connecting branch pipe 3 to the main output pipe 2. Opening the input control branch valve 4 of the first connecting branch pipe 3 connects the first connecting branch pipe 3 to the main input pipe 1. One end of the main output pipe 2 is provided with a methanol control main valve 7. Opening the methanol control main valve 7 connects the main output pipe 2 to the output end 12 of the methanol delivery pump group. One end of the main input pipe 1 is equipped with a fuel control main valve 6. Opening the fuel control main valve 6 connects the main input pipe 1 to the input end of the fuel delivery pump group.

[0036] When the methanol / fuel oil shared compartment is loaded with fuel oil or methanol, the input control valve 5 of the first connecting branch pipe 3 corresponding to the fuel oil compartment is opened to connect the fuel oil in the compartment to the main input pipe 1; similarly, the input control valve 5 of the first connecting branch pipe 3 corresponding to the methanol compartment is opened to connect the methanol in the compartment to the main input pipe 1. Multiple sets of first connecting branch pipes are independently controlled, allowing for switching of the input control valve 5 of the first connecting branch pipe 3 according to route requirements, enabling individual access to either the fuel oil compartment or the fuel oil medium, thus flexibly selecting the fuel for the methanol / fuel oil shared compartment.

[0037] In practical scenarios, when a ship enters a low-emission sea area, the output control valve 5 of the first connecting branch pipe 3 corresponding to the methanol tank is opened, and the valves of the other branch pipes are closed, allowing methanol to be independently supplied to the main input pipeline 1. When a ship enters a normal sea area and methanol fuel is not required, the input control valve 5 of the first connecting branch pipe 3 corresponding to the methanol tank is closed, and the methanol in the main input pipeline 1 is purged with nitrogen. Then, the input control valve 5 of the first connecting branch pipe 3 corresponding to the fuel oil tank is opened, allowing fuel oil to be independently supplied to the main input pipeline 1. This enables the supply of methanol or diesel on demand, greatly improving the utilization rate of ship capacity and adaptability to operating conditions, and meeting the fuel needs of ships in different navigation areas.

[0038] Preferred, refer to Figure 2 When fuel enters the main inlet pipe 1, the fuel control main valve 6 is opened, creating a delivery path between the main inlet pipe 1 and the fuel delivery pump unit input, thus delivering fuel to the fuel delivery pump unit input. Through the coordinated operation of the main inlet pipe 1, the fuel control main valve 6, and the first connecting branch pipe 3, a stable delivery of fuel from the shared compartment to the fuel delivery pump unit is achieved.

[0039] Preferred, refer to Figure 2 A second connecting branch pipe 9 is installed between the main input pipe 1 and the main output pipe 2. This second connecting branch pipe 9 is also a T-junction connecting branch pipe. The middle connecting part of the second connecting branch pipe 9 connects to the input end 11 of the methanol transfer pump unit. Input control valve 4 and output control valve 5 are respectively installed at the two connecting ends of the second connecting branch pipe. Simultaneously opening the input control valve 5 of the second connecting branch pipe 9 and the input control valve 5 of the first connecting branch pipe 3 connects the second connecting branch pipe 9 to the main input pipe 1 and the first connecting branch pipe 3 in sequence, thus transferring methanol from the methanol tank to the input end 11 of the methanol transfer pump unit. Simultaneously opening the output control valve 4 of the first connecting branch pipe 3 and the output control valve 4 of the second connecting branch pipe 9 connects the second connecting branch pipe 9 to the main output pipe 2 and the first connecting branch pipe 3 in sequence.

[0040] When methanol enters the main inlet pipe 1, the input control valve 5 of the second connecting branch pipe 9 is opened, allowing the methanol from the main inlet pipe 1 to flow into the second connecting branch pipe 9 and then into the input end 11 of the methanol transfer pump unit, thus achieving stable extraction of the methanol medium. After being pressurized by the methanol transfer pump unit, the methanol medium is pumped to the output end 12 of the methanol transfer pump unit. Subsequently, the main methanol control valve 7 is opened, and the methanol medium is pumped to the main outlet pipe 2.

[0041] Preferred, refer to Figure 2 A third connecting branch pipe 10 is installed between the main input pipe 1 and the main output pipe 2. This third connecting branch pipe 10 is also a T-junction. The middle connecting part of the third connecting branch pipe 10 connects to the input end 13 of the FVT unit. The two connecting parts of the third connecting branch pipe 10 are respectively equipped with an input control branch valve 4 and an output control branch valve 5. Opening the input control branch valve 5 of the third connecting branch pipe 10 connects the third connecting branch pipe 10 to the main input pipe 1. Opening the output control branch valve 4 of the third connecting branch pipe 10 connects the third connecting branch pipe 10 to the main output pipe 2. Simultaneously opening the output control branch valve 4 and the methanol control main valve 7 of the third connecting branch pipe 10 delivers methanol from the output end 12 of the methanol delivery pump unit to the input end 13 of the FVT unit.

[0042] After the methanol medium is pumped to the main output pipeline 2, the output control branch valve 4 of the third connecting branch pipe 10 is opened. The methanol medium is then transported to the input end 13 of the FVT unit through the third connecting branch pipe 10, so that the output end 12 of the methanol delivery pump set, the main output pipeline 2, the third connecting branch pipe 10, and the input end 13 of the FVT unit form a complete closed supply circuit. The methanol medium is then supplied to the generator set for combustion after being temperature controlled, pressure stabilized, and timing regulated by the FVT unit.

[0043] Preferred, refer to Figure 2 The other end of the main output pipe 2 is also equipped with a fuel filling control valve 8. When the fuel filling control valve 8 is opened, the main output pipe 2 is connected to the output end of the fuel delivery pump unit. In the fuel transfer and filling operation, the fuel filling control valve 8 and the methanol control valve 7 are opened simultaneously, so that the output end of the fuel delivery pump unit, the main output pipe 2, and the fuel tank form a conductive loop, realizing the reverse filling of fuel from the fuel delivery pump unit to the fuel tank.

[0044] Preferred, refer to Figure 3 The methanol transfer pump unit includes two methanol transfer pumps connected in parallel. Each methanol transfer pump includes a centrifugal pump 16 for providing pumping power. A methanol transfer pump safety valve 21 and a pressure relief return pipeline 22 are installed next to the centrifugal pump 16. When the pipeline pressure abnormally exceeds the limit, the methanol transfer pump safety valve 21 opens, and the high-pressure methanol medium flows back to the methanol release chamber through the pressure relief return pipeline 22, realizing system overpressure protection.

[0045] The methanol transfer pump is divided into an inlet side and an outlet side with centrifugal pump 16 as the origin. The inlet side of the methanol transfer pump is equipped with the following components in sequence: the main inlet isolation valve 3301, the branch inlet isolation valve 3302, the Y-type filter 14, and the differential pressure detection assembly 15. The main inlet isolation valve 3301 is used to isolate the methanol transfer pump from the upstream second connecting branch pipe 9; the branch inlet isolation valve 3302 is used to prevent methanol from the pressure relief return line 22 from flowing back to the inlet side of the methanol transfer pump; the Y-type filter 14 is used to filter out solid impurities in the methanol medium; and the differential pressure detection assembly 15 monitors the filter element blockage status in real time.

[0046] Preferred, refer to Figure 3 The methanol delivery pump suction side is also connected to a nitrogen purging circuit. The nitrogen purging circuit includes a nitrogen inlet pneumatic valve 2001 and a nitrogen check valve 2002. The nitrogen filling port introduces nitrogen into the methanol delivery pipeline through the nitrogen inlet pneumatic valve 2001 and the nitrogen check valve 2002 to complete pipeline purging, residual liquid replacement and inert protection, and prevent methanol from volatilizing and forming flammable gas.

[0047] Preferred, refer to Figure 3Each methanol transfer pump is sequentially equipped with a differential pressure detection component 15, an outlet check valve 17, an outlet branch isolation valve 1802, and an outlet main isolation valve 1801 on its output side. The differential pressure detection component 15 is used to monitor the outlet pressure of the methanol transfer pump in real time; the outlet check valve 17 is used to prevent backflow of the medium and reverse rotation of the pump body after the pump body stops operating; the outlet branch isolation valve 1802 is used to prevent methanol from the pressure relief backflow pipeline 22 from flowing back to the output side of the methanol transfer pump; and the outlet main isolation valve 1801 is used to achieve secondary isolation between the output side of the methanol transfer pump and the downstream main output pipeline 2.

[0048] The common output circuit of the two parallel methanol transfer pumps is also equipped with a methanol transfer pump group main isolation valve 19, which is used to form an initial isolation between the methanol transfer pump group output end 12 and the main output pipeline 2.

[0049] Preferred, refer to Figure 4 and Figure 5 The methanol dual-fuel generator set and the fuel supply pump set are also equipped with a fuel conditioning unit and a filter adjustment unit, among which... The fuel conditioning unit includes a heat exchanger 23. Both the input and output ends of the heat exchanger 23 are equipped with fuel conditioning unit isolation valves 27 for independent isolation and maintenance of the fuel conditioning unit. A bypass pipeline and a bypass isolation valve 26 of the fuel conditioning unit are connected in parallel to the input and output ends of the heat exchanger 23. When the heat exchanger fails or temperature regulation is not required, the bypass isolation valve 26 of the fuel conditioning unit is opened, allowing fuel to flow directly through the bypass pipeline, ensuring uninterrupted fuel supply. Pressure transmitters 24 and temperature transmitters 25 are installed at both the input and output ends of the heat exchanger 23 to collect real-time pressure and temperature parameters of the fuel and upload them to the control system. The heat exchanger 23 is used to cool the high-temperature fuel, controlling the fuel temperature within the allowable operating range of the unit. A fuel delivery pipeline isolation valve 28 is also provided between the fuel delivery pipelines at the input and output ends of the heat exchanger 23. When the fuel delivery pipeline isolation valve 28 is closed, the fuel conditioning unit isolation valve 27 is opened, allowing high-temperature fuel to enter the fuel conditioning unit and preventing high-temperature fuel from being directly delivered to the filter conditioning unit along the fuel delivery pipeline.

[0050] After conditioning, the fuel is delivered to the filter conditioning unit, as per [reference]. Figure 5The filtration and regulation unit is sequentially equipped with a pressure regulating valve 29, a dual-path switching valve assembly 30, a fuel filter 31, and a pressure and temperature monitoring instrument 32. The pressure regulating valve 29 dynamically stabilizes the fuel delivery pressure to prevent pressure fluctuations from affecting combustion conditions. The stabilized fuel is then delivered to the methanol dual-fuel generator set. Both paths of the dual-path switching valve assembly 30 are equipped with fuel filters 31, forming a dual-filter assembly. When fuel flows through the dual-path switching valve assembly 30, the assembly controls the fuel flow direction, enabling online switching of the dual-filter assembly. This allows for online filter element switching and maintenance without shutting down the generator set in case one fuel filter 31 fails. The pressure and temperature monitoring instrument 32 is used for final testing of the fuel delivered to the methanol dual-fuel generator set.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A methanol-fuel dual-fuel system, characterized in that, This includes a shared methanol fuel tank, a methanol fuel switching valve assembly, a methanol transfer pump assembly, an FVT unit, a methanol dual-fuel generator set, and a fuel transfer pump assembly, wherein: The methanol fuel switching valve assembly includes a main input channel and a main output channel, and a plurality of first connecting branch pipes are provided between the main input channel and the main output channel; The input end of the methanol fuel tank is connected to the main output channel or an external refueling station, and is used to refuel fuel or methanol into the methanol fuel tank. The output end of the methanol fuel shared compartment is connected to the first connecting branch pipe, and is used to deliver fuel or methanol to the methanol fuel switching valve group. The methanol fuel switching valve group is connected to the fuel delivery pump group and the methanol delivery pump group respectively, and is used to switch the pipeline path and selectively conduct the fuel delivery circuit or the methanol delivery circuit. The methanol delivery pump unit is connected to the FVT unit and is used to stabilize, heat and filter the pressurized methanol. Both the FVT unit and the fuel delivery pump set are connected to the methanol dual-fuel generator set, supplying methanol and fuel oil to the methanol dual-fuel generator set respectively.

2. The methanol-fuel dual-fuel system according to claim 1, characterized in that, The methanol dual-fuel system also includes a methanol venting chamber, which is connected to the methanol delivery pump group, the FVT unit and the methanol dual-fuel generator group, respectively, and is used to collect residual, depressurized and backflowed methanol waste liquid in the methanol delivery pump group, the FVT unit and the methanol dual-fuel generator group.

3. The methanol-fuel dual-fuel system according to claim 1, characterized in that, A fuel tank and a fuel supply pump set are provided between the fuel transfer pump set and the methanol dual-fuel generator set, wherein: The output end of the fuel delivery pump unit is connected to the fuel tank and is used to deliver fuel to the fuel tank; the fuel tank is connected to the input end of the fuel supply pump unit, and the output end of the fuel supply pump unit is connected to the methanol dual-fuel generator set and is used to pump the fuel in the fuel tank to the methanol dual-fuel generator set.

4. The methanol-fuel dual-fuel system according to claim 1, characterized in that, The methanol fuel switching valve assembly further includes a second connecting branch pipe and a third connecting branch pipe. The second connecting branch pipe and the third connecting branch pipe are both located between the main input pipe and the main output pipe. The second connecting branch pipe is connected to the input end of the methanol delivery pump assembly, and the third connecting branch pipe is connected to the input end of the FVT unit.

5. A methanol-fuel dual-fuel system according to claim 4, characterized in that, Each of the first, second, and third connecting branch pipes is equipped with an input control branch valve at one end to control the connection between the first, second, and third connecting branch pipes and the main input channel; each of the first, second, and third connecting branch pipes is equipped with an output control branch valve at the other end to control the connection between the first, second, and third connecting branch pipes and the main output channel.

6. A methanol-fuel dual-fuel system according to claim 5, characterized in that, One end of the main output pipe is equipped with a methanol control valve to control the connection between the main output pipe and the output end of the methanol delivery pump group; the other end of the main output pipe is also equipped with a fuel filling control valve to control the connection between the main output pipe and the output end of the fuel delivery pump group; one end of the main input pipe is equipped with a fuel control valve to control the connection between the main input pipe and the input end of the fuel delivery pump group.

7. A methanol-fuel dual-fuel system according to claim 6, characterized in that, Simultaneously, the input control valves of the first connecting branch pipe and the second connecting branch pipe are opened, allowing methanol from the methanol fuel tank to flow sequentially through the first connecting branch pipe, the main input pipe, and the second connecting branch pipe, and be delivered to the input end of the methanol delivery pump unit; simultaneously, the main methanol control valve and the output control valve of the third connecting branch pipe are opened, allowing methanol pumped by the output end of the methanol delivery pump unit to flow sequentially through the main output pipe and the third connecting branch pipe, and be delivered to the input end of the FVT unit.

8. A methanol-fuel dual-fuel system according to claim 2, characterized in that, The methanol delivery pump set includes two methanol delivery pumps connected in parallel. Each methanol delivery pump has an inlet isolation valve, a Y-type filter, a differential pressure detection component, and a nitrogen purging circuit at its suction end. Each methanol delivery pump has a check valve and an outlet isolation valve at its discharge end. The methanol delivery pump set is also equipped with a safety valve and a pressure relief return pipeline. The outlet of the safety valve is connected to the methanol release chamber.

9. A methanol-fuel dual-fuel system according to claim 2, characterized in that, The output end of the methanol release chamber is connected to a first connecting branch pipe, which is used to transport the methanol release chamber to the methanol fuel switching valve group for recycling.

10. A methanol-fuel dual-fuel system according to claim 3, characterized in that, A fuel conditioning unit and a filter adjustment unit are also provided between the methanol dual-fuel generator set and the fuel supply pump set, wherein: The fuel conditioning unit includes a heat exchanger, and the inlet and outlet of the heat exchanger are equipped with isolation valves, bypass valve groups, and pressure and temperature monitoring elements. The filtration and regulation unit includes a dual-channel switching valve group, a dual-filter assembly, and a pressure regulating valve.

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