Fuel treatment system of marine V-shaped methanol fuel engine

Abstract

The invention discloses a fuel treatment system of a V-shaped methanol fuel engine for a ship. The fuel treatment system comprises a split-flow conveying module, a fuel supply module, a fuel injection module, a leakage collection module, a leakage alarm module, a nitrogen purging module and a forced exhaust module. The fuel supply modules are divided into a column A and a column B, the split-flow conveying module conveys fuel to the column A and the column B of the fuel supply modules, and the columns of the fuel supply modules are connected through pipelines; each fuel supply module is connected with the multiple fuel injection modules and used for supplying methanol fuel in the main pipeline to the fuel injection modules to complete fuel conveying; according to the fuel treatment system of the V-shaped methanol fuel engine for the ship, the functions of stable-pressure supply of the V-shaped methanol fuel engine, safety protection of key leakage parts, monitoring and treatment of gas-liquid two-state leaked fuel, fuel emptying in the processes of shutdown maintenance and the like are achieved, safe use of fuel in the whole use process of the engine is achieved, and personnel safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of marine methanol fuel engine technology, specifically a fuel processing system for a marine V-type methanol fuel engine. Background Technology

[0002] During the use of methanol fuel engines, operators may come into direct or indirect contact with methanol fuel. Methanol fuel leaks are affected by temperature and fuel volatility, with liquid methanol evaporating into gaseous methanol. Once leaked, it can lead to inhalation by personnel. Therefore, it is necessary to carry out protective measures for methanol fuel engines throughout the entire process.

[0003] However, in the existing technology, methanol fuel engines have the following defects in terms of fuel protection: (1) Marine V-type fuel engines are limited by the limited space in the engine room, and the arrangement of fuel supply and fuel safety venting is difficult. Affected by the ignition sequence, pipeline length and pipeline distribution, the influence of the engine fuel treatment device itself on the unstable supply pressure of the engine A / B series and the injectors of each cylinder is not considered; (2) The location of fuel leakage is not well understood. The engine uses double-walled pipelines for methanol leakage, but the connection of the double-walled pipeline and the double-walled methanol injection valve (engine methanol injection unit) are more prone to leakage. There is a lack of leakage treatment methods for methanol pipeline connection ports and the internal components of double-walled methanol injection valves; (3) The engine uses nitrogen ventilation protection method for fuel leakage, but the fuel is affected by the high temperature of the engine, and methanol leakage has two distributions: gaseous and liquid. There is a lack of different leakage protection for gaseous and liquid leakage; (4) During engine shutdown and maintenance, there is a lack of treatment for non-leaking fuel in the engine. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a fuel treatment system for a marine V-type methanol fuel engine. This system enables functions such as stable pressure supply to the V-type methanol fuel engine, safety protection of key leakage points, monitoring and treatment of fuel leakage in both gas and liquid states, and fuel venting during shutdown maintenance. It ensures safe fuel use throughout the engine's operation, protects personnel safety, and effectively solves the problems in the background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fuel treatment system for a marine V-type methanol fuel engine, comprising a diversion and delivery module, a fuel supply module, a fuel injection module, a leak collection module, a leak alarm module, a nitrogen purging module, and a forced exhaust module;

[0006] The fuel supply module is divided into two columns, A and B. The diversion and conveying module delivers fuel to the fuel supply modules in columns A and B. Each column of fuel supply modules is connected by pipelines.

[0007] Each fuel supply module is connected to multiple fuel injection modules to supply methanol fuel in the main pipeline to the fuel injection modules to complete fuel delivery.

[0008] The leakage collection module is located at the connection point between the fuel supply modules to collect leaked fuel;

[0009] The leakage alarm module is located at the bottom end of the leakage collection module to check and alarm for fuel leakage in different states.

[0010] The nitrogen purging module is located at the end of the fuel supply modules in columns A and B, and is used to introduce nitrogen to purge the fuel in the main delivery pipeline of the engine.

[0011] The forced exhaust module is located at the end of the engine to vent the fuel accumulated inside the engine.

[0012] As a preferred embodiment of the present invention, the diversion and conveying module includes a diversion block, a vent pipe, a gaseous methanol detection port, a fuel supply main pipe, and a diversion and conveying pipe;

[0013] The fuel supply main pipe is equipped with a diversion block, and diversion conveying pipes are symmetrically connected to both sides of the diversion block to deliver the fuel entering the fuel supply main pipe to the fuel supply modules in columns A and B respectively. The fuel supply main pipe is equipped with inner and outer double-layer passages. The inner passage is connected to the inside of the diversion block and is used to transport fuel. The outer passage is connected to the vent pipe and the outer through hole of the diversion block.

[0014] The gaseous methanol detection port is located outside the fuel supply main pipe and is used to monitor the leakage of gaseous methanol in real time.

[0015] As a preferred embodiment of the present invention, the fuel supply module includes a main pipeline, branch pipelines, and connecting pipelines;

[0016] The main pipeline is used to connect to the branch block. One end of the branch pipeline is connected to the main pipeline and the other end is connected to the fuel injection module. One end of the connecting pipe is connected to the main pipeline and the other end is connected to the main pipeline in other fuel supply modules.

[0017] The main pipeline, branch pipelines, and connecting pipelines are all double-walled pipes, including an external fuel protection passage and an internal fuel delivery passage.

[0018] As a preferred embodiment of the present invention, the connecting pipe has a corrugated bending structure.

[0019] As a preferred embodiment of the present invention, the fuel injection module includes a double-walled methanol injection valve, an intake pipe, and an intake pipe drain valve;

[0020] The double-wall methanol injection valve is connected to the branch pipe in the fuel supply module. The double-wall methanol injection valve is installed on the intake pipe through sealing rings at the top and bottom. The top of the double-wall methanol injection valve is provided with a leakage overflow port. When the double-wall methanol injection valve malfunctions or the pressure rises sharply, the leakage overflow port opens to release the fuel in time, protecting the double-wall methanol injection valve from fuel leakage or blockage caused by internal malfunction.

[0021] An air inlet drain valve is provided at the bottom of the air inlet pipe.

[0022] As a preferred embodiment of the present invention, the leakage collection module includes a collection block, a connecting nut, and a collection tube;

[0023] The connecting nut connects the branch pipe in the fuel supply module to the double-walled methanol injection valve in the fuel injection module. The collecting block is located on the outside of the connecting nut, and the lower end of the collecting block is connected to the collecting pipe.

[0024] The branch pipe is connected to the connecting nut by a branch pipe sealing ring, and the branch pipe sealing ring is provided with a sealing ring vent hole;

[0025] The two ends of the collecting block and the connecting nut are sealed and connected by the collecting block O-ring and the connecting nut O-ring, respectively.

[0026] As a preferred embodiment of the present invention, the leakage alarm module includes a central connector, a connecting pipe, a liquid level alarm device, and an oil tank;

[0027] The two ends of the summing connector are respectively connected to connecting pipes, and the two connecting pipes are respectively connected to the collection pipes in the leakage collection modules of columns A and B. One end of the liquid level alarm device is connected to the summing connector, and the other end is connected to the oil tank.

[0028] The collection connector, liquid level alarm device, and oil tank are arranged from high to low. The leaked liquid fuel flows to the liquid level alarm device at the lower position. The flowing methanol fuel will trigger the leak alarm and eventually flow into the oil tank to complete the leakage collection work.

[0029] As a preferred embodiment of the present invention, the nitrogen purging module includes a purging block, a methanol manual drain valve, a sensor, and a protective cover;

[0030] One end of the purge block is connected to the main pipeline, and the other end of the purge block is connected to the protective cover. The methanol manual drain valve and the sensor are located inside the protective cover. The methanol manual drain valve is set in the main channel of the purge block, and the sensor is set in the exhaust channel of the purge block. A nitrogen inlet is provided on the other side of the purge block. Two symmetrical vent holes are provided on the purge block, and the vent holes are connected to the fuel protection passage in the main pipeline.

[0031] The fuel delivery passage in the main pipeline is connected to the main channel of the purging block.

[0032] As a preferred embodiment of the present invention, the forced exhaust module includes a combustion chamber, a starter motor, an exhaust pipe, a forced exhaust valve, and a centrifugal fan;

[0033] The combustion chamber inlet is connected to the air outlet of the fuel injection module's intake pipe, and the combustion chamber outlet is connected to the exhaust pipe. The exhaust pipe converges into the exhaust channel, and a forced exhaust valve and a centrifugal fan are provided on the outside of the exhaust channel. The starter motor is used to control the engine operation, open the combustion chamber's inlet and outlet channels, and control air to enter the exhaust channel to discharge fuel.

[0034] Compared with the prior art, the beneficial effects of the present invention are: (1) It ensures that personnel do not come into contact with methanol fuel during the entire process of engine use, especially solving the problem of methanol fuel residue in the engine during shutdown and maintenance, and is not afraid of the harsh environment of high temperature in the engine compartment, making it easy to implement and safe and reliable; (2) It adopts a modular design, with zero difference in fuel supply to each cylinder, and stable and reliable fuel supply pressure, and is not afraid of pressure fluctuations; (3) It has carried out differentiated treatment design for fuel leakage in different physical states, ensuring that fuel leakage will not accumulate and stay away from the source of danger; (4) In response to the problem of easy leakage at the connection of engine parts, fuel leakage is collected at the connection of parts and the installation of sensors, ensuring that the leakage point is controlled at the first time. Attached Figure Description

[0035] Figure 1 This is a modular system diagram of the present invention;

[0036] Figure 2 This is a schematic diagram of the diversion and delivery module;

[0037] Figure 3 A schematic diagram of the fuel supply module and the leakage collection module;

[0038] Figure 4 This is a schematic diagram of the fuel injection module.

[0039] Figure 5 This is a schematic diagram of the nitrogen purging module;

[0040] Figure 6 This is a structural diagram of the leakage alarm module;

[0041] Figure 7 This is a plan view of the forced exhaust module.

[0042] In the diagram: 100 Diversion and delivery module, 101 Vent pipe, 102 Gaseous methanol detection port, 103 Fuel supply main pipe, 104 Diversion block, 105 Diversion and delivery pipe, 200 Fuel supply module, 201 Main pipeline, 201a Fuel protection path, 201b Fuel delivery path, 202 Branch pipeline, 203 Connecting pipe, 300 Fuel injection module, 301 Double-wall methanol injection valve, 301a Sealing ring, 301b Leakage overflow port, 302 Inlet pipe, 303 Inlet pipe drain valve, 400 Leakage collection module, 401 Collection block, 401a Collection block O-rings, 402 connecting nuts, 402a connecting nuts and O-rings, 403 collecting pipe, 404 branch pipe sealing ring, 404a sealing ring drain hole, 500 leakage alarm module, 501 main connector, 502 connecting pipe, 503 liquid level alarm device, 504 oil tank, 600 nitrogen purging module, 601 purging block, 601a vent hole, 602 methanol manual drain valve, 603 sensor, 604 protective cover, 700 forced exhaust module, 701 combustion chamber, 702 starter motor, 703 exhaust pipe, 704 forced exhaust valve, 705 centrifugal fan. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] like Figure 2 The diversion and delivery module 100 includes a diversion block 104, a vent pipe 101, a gaseous methanol detection port 102, a fuel supply main pipe 103, and a diversion and delivery pipe 105.

[0045] The diversion and delivery module 100 mainly has the functions of fuel diversion, nitrogen protection, and gaseous fuel leakage detection. Fuel in the inner pipe of the fuel supply main pipe 103 of the diversion and delivery module 100 enters the diversion block 104 and is divided into two paths, A and B, which enter the fuel supply module 200 along the diversion and delivery pipes 105 of the A and B paths, respectively. At the same time, a certain negative pressure is formed at the far end of the fuel supply main pipe 103 by suction, and nitrogen is introduced through the vent pipe 101. The gaseous fuel leaking in the diversion and delivery pipe 105 mixes with the nitrogen and is discharged through the outer passage of the diversion block 104 along the outer pipe of the fuel supply main pipe 103. At the same time, a gaseous methanol detection port 102 is designed at the outer pipe of the fuel supply main pipe 103 to monitor the gaseous methanol leakage in real time.

[0046] like Figure 3The fuel supply module 200 includes a main pipe 201, a branch pipe 202, and a connecting pipe 203. The main pipe 201, the branch pipe 202, and the connecting pipe 203 are all double-walled pipes, including an external fuel protection passage 201a and an internal fuel delivery passage 201b.

[0047] The fuel supply module 200 has the functions of stabilizing voltage and supplying fuel, and the leakage collection module 400 is installed at the bottom of the fuel supply module 200 and has the function of collecting liquid fuel leakage.

[0048] The inner fuel delivery passage 201b of the main pipeline 201 stores methanol fuel. The main pipeline 201 is connected to the main pipeline 201 of other fuel supply modules 200 through the connecting pipe 203. The fuel in the main pipeline 201 is connected to the fuel injection module 300 through the branch pipeline 202 and supplied with methanol fuel.

[0049] Furthermore, the main pipe 201, branch pipe 202, and connecting pipe 203 are all double-walled pipes. In the event of a leak, fuel will enter the fuel protection passage 201a of the outer pipe of the main pipe 201.

[0050] Furthermore, the connecting pipe 203 is designed with a corrugated bending structure, which can avoid the mutual fluctuation of pressure in the fuel storage space.

[0051] Furthermore, the gourd-shaped fuel storage space formed by the connecting pipe 203 between the main pipelines 201 can effectively avoid pressure fluctuations, thereby achieving a more stable and uniform fuel supply to each cylinder.

[0052] The leakage collection module 400 includes a collection block 401, a connecting nut 402, and a collection tube 403;

[0053] The connecting nut 402 in the leakage collection module 400 connects the branch pipe 202 to the fuel injection module 300. At the same time, the branch pipe 202 is connected to the collection block 401 through the internal passage of the connecting nut 402. The leaked fuel in the branch pipe 202 enters the collection pipe 403 through the connecting nut 402 and the collection block 401 in sequence. The connection of the branch pipe 202 is fixed by the thread preload applied to the sealing ring 404 of the branch pipe by the connecting nut 402. The conical surface at the connection of the branch pipe 202 and the conical surface at the installation point form a pressure seal.

[0054] The branch pipe sealing ring 404 between the branch pipe 202 and 402 connecting nuts is used to protect the branch pipe 202 from pressure deformation caused by long-term use.

[0055] Preferably, the O-rings 401a and 402a designed at both ends of the collecting block 401 and the connecting nut 402 form two isolation leakage protection channels and isolate them from the external environment.

[0056] Furthermore, the branch pipe sealing ring 404 is designed with a sealing ring vent hole 404a. Once the connection of the branch pipe 202 leaks, the leaked fuel will leak through the sealing ring vent hole 404a into the fuel protection passage 201a of the branch pipe 202.

[0057] Furthermore, the connection points of the diversion and conveying module 100, the fuel supply module 200, and the fuel injection module 300 are all designed with collection blocks 401 and connecting nuts 402, thereby enabling the protection channels of each module to be interconnected and to collect and protect against interface leakage separately.

[0058] like Figure 4 The fuel injection module 300 includes a double-walled methanol injection valve 301, an intake pipe 302, and an intake pipe drain valve 303.

[0059] The fuel injection module 300 has functions such as fuel injection and fuel venting. The double-wall methanol injection valve 301 is installed on the intake pipe 302 through two sealing rings 301a. The double-wall methanol injection valve 301 is used to control fuel injection. After the fuel mixes with the air in the intake pipe 302, it enters the combustion chamber 701 to supply the combustion chamber 701 with the required fuel. The sealing rings 301a wrap the double-wall methanol injection valve 301 in the upper inner cavity of the intake pipe 302 to form double-wall protection.

[0060] Furthermore, the top of the double-wall methanol injection valve 301 is designed with a leakage overflow port 301b. When the double-wall methanol injection valve 301 malfunctions (cannot be opened or closed) or the pressure rises sharply, the leakage overflow port 301b opens to release the fuel in time, protecting the double-wall methanol injection valve 301 from fuel leakage or blockage caused by internal malfunction.

[0061] Furthermore, an intake manifold drain valve 303 is designed at the bottom of the intake manifold 302 for venting residual fuel.

[0062] like Figure 5 The nitrogen purging module 600 includes a purging block 601, a methanol manual drain valve 602, a sensor 603, and a protective cover 604.

[0063] The protective cover 604 is interconnected with the purge block 601, enclosing the sensor 603 and the methanol manual drain valve 602 in a cavity. The cavity is connected to the fuel protection passage 201a through the vent 601a, ensuring that the nitrogen purge module 600 and the leakage collection module 400 are interconnected through the fuel protection passage 201a during normal operation. The methanol manual drain valve 602 is normally closed. When the engine is stopped and residual fuel needs to be removed, the nitrogen purge modules 600 of the A and B rows of the engine are opened. One row of methanol manual drain valves 602 is connected to nitrogen, and the other row of methanol manual drain valves 602 is connected to the collection pipe 403. Then, both rows of methanol manual drain valves 602 are opened, and the methanol fuel in the main pipeline 201 is emptied by high-pressure nitrogen.

[0064] like Figure 6 The leakage alarm module 500 includes a central connector 501, a connecting pipe 502, a liquid level alarm device 503, and an oil tank 504.

[0065] The liquid fuel collected by the leakage collection modules 500 in columns A and B is connected to the connecting pipe 502 through the main connector 501. The leaked liquid fuel flows to the lower liquid level alarm device 503. The flowing methanol fuel will trigger the leakage alarm and eventually flow into the oil tank 504 to complete the leakage collection work.

[0066] Furthermore, the liquid level alarm device 503 has a leakage flow monitoring function, which can issue alarms of different degrees according to the size of the leakage.

[0067] Furthermore, the components of the leak alarm module 500 are arranged from high to low along the flow direction to prevent leaked fuel from accumulating in the pipeline and affecting the accuracy of the leak alarm.

[0068] like Figure 7 The forced exhaust module 700 includes a combustion chamber 701, a starter motor 702, an exhaust pipe 703, a forced exhaust valve 704, and a centrifugal fan 705.

[0069] When engine failure or abnormal shutdown causes fuel to accumulate in engine combustion chamber 701, starter motor 702 is turned on but fuel supply is stopped. Starter motor 702 will open the inlet and outlet passage of combustion chamber 701 and form exhaust pressure. At the same time, the forced exhaust valve 704 and centrifugal fan 705 are activated to form a strong negative pressure. As a result, the residual fuel in combustion chamber 701 is discharged from the engine along exhaust pipe 703 under the influence of pressure.

[0070] Furthermore, the starter motor 702 is used to control the engine operation, open the combustion chamber 701 inlet and outlet passages, and control the air intake and fuel exhaust.

[0071] Furthermore, the forced exhaust valve 704 and the centrifugal fan 705 remain closed when the engine is operating normally.

[0072] like Figure 1 As shown in the methanol fuel flow line, the fuel enters the A and B column diversion and conveying modules 100 through the inner conveying channel of the diversion and conveying module 100. Each fuel supply module 200 is responsible for supplying fuel to the fuel injection module 300 through the inner conveying channel. The fuel injection module 300 is responsible for injecting fuel into the engine combustion chamber of the forced exhaust module 700 as needed. After the fuel is burned, exhaust gas is formed and discharged, thus completing the methanol fuel supply to the engine.

[0073] As shown in the figure, during the fuel transportation process, the liquid fuel leaked from the diversion and transportation module 100, fuel supply module 200 and fuel injection module 300 will enter the protection channel (outer pipeline of dual passage) of the module. The diversion and transportation module 100, fuel supply module 200 and fuel injection module 300 are distributed from high to low. The protection channels of each module are interconnected. The leaked fuel eventually flows to the leak collection module 400 under the influence of gravity. The methanol fuel in the leak collection module 400 will flow to the leak alarm module 500 at a lower position under the influence of gravity and issue a leak alarm.

[0074] As shown in the diagram of the leaked fuel (gaseous) flow line, during the fuel transportation process, the leaked liquid fuel from the diversion and transportation module 100, fuel supply module 200, and fuel injection module 300 will enter the protection channel (outer pipe of the dual-pathway) of the module. Affected by temperature and fuel evaporation, the fuel will evaporate into gaseous fuel. At this time, the diversion and transportation module 100 continuously introduces nitrogen and forms a negative pressure by evacuating the gas at the far end of the combustion transportation. The leaked gaseous fuel is then drawn into the nitrogen in the diversion and transportation module 100 from low to high along the fuel injection module 300, fuel supply module 200, and diversion and transportation module 100, and discharged with the nitrogen recovery port. At this time, the gaseous methanol detection alarm at the inlet end of the diversion and transportation module 100 can detect and alarm the gaseous methanol fuel leak.

[0075] When the engine is stopped and the methanol fuel needs to be purged, nitrogen is introduced into a nitrogen purging module 600. The nitrogen enters the fuel supply module 200, the diversion and delivery module 100 and the fuel injection module 300 delivery pipeline. The fuel is then discharged to the leakage alarm module 500 through another nitrogen purging module 600 and the bottom fuel injection module 300, and then the fuel is recovered to the fuel tank 504 for recovery. This completes the purging of the fuel in the delivery pipeline.

[0076] In addition, the forced exhaust module 700 starts the engine at a low speed and opens the forced exhaust valve 704 to discharge the methanol fuel and exhaust gas in the combustion chamber 701 of the forced exhaust module 700. This completes the discharge of all residual fuel in the engine, avoids personnel contact with methanol, and meets the safety requirements for engine maintenance, troubleshooting, etc.

[0077] The parts of the invention not described in detail are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A marine V-type methanol fuel engine fuel handling system characterized by: The device comprises a shunt delivery module (100), a fuel supply module (200), a fuel injection module (300), a leakage collection module (400), a leakage alarm module (500), a nitrogen purge module (600) and a forced exhaust module (700); The fuel supply module (200) is divided into two columns A and B, and the shunt delivery module (100) delivers fuel to the fuel supply modules (200) in columns A and B, and each column of fuel supply modules (200) is connected by a pipeline; Each fuel supply module (200) is connected with a plurality of fuel injection modules (300) for supplying methanol fuel in the main pipeline to the fuel injection modules (300) to complete fuel delivery; The leakage collection module (400) is arranged at the connection position between the fuel supply modules (200) to collect leaked fuel; The leakage alarm module (500) is arranged at the bottom end of the leakage collection module (400) to check and alarm different state leaked fuel; The nitrogen purge module (600) is arranged at the end of the fuel supply modules (200) in columns A and B for introducing nitrogen to empty the fuel in the main delivery pipeline of the engine; The forced exhaust module (700) is arranged at the end of the engine to empty the accumulated fuel in the engine.

2. A marine V-type methanol fuel engine fuel handling system according to claim 1, characterized in that: The shunt delivery module (100) comprises a shunt block (104), an air pipe (101), a gaseous methanol detection port (102), a fuel supply main pipe (103) and a shunt delivery pipe (105); The fuel supply main pipe (103) is provided with the shunt block (104), and the two sides of the shunt block (104) are symmetrically connected with the shunt delivery pipes (105) to respectively deliver the fuel entering the fuel supply main pipe (103) to the fuel supply modules (200) in columns A and B, and the fuel supply main pipe (103) is provided with inner and outer double-layer passages, the inner passage is connected with the inside of the shunt block (104) for delivering fuel, and the outer passage is connected with the air pipe (101) and the outer through hole of the shunt block (104); The gaseous methanol detection port (102) is arranged outside the fuel supply main pipe (103) for real-time monitoring of the leakage of gaseous methanol.

3. A marine V-type methanol fuel engine fuel handling system according to claim 2, characterized in that: The fuel supply module (200) comprises a main pipeline (201), a branch pipeline (202) and a communication pipe (203); The main pipeline (201) is used for connecting the shunt block (104), one end of the branch pipeline (202) is connected with the main pipeline (201), the other end is connected with the fuel injection module (300), one end of the communication pipe (203) is connected with the main pipeline (201), and the other end is connected with the main pipeline (201) in other fuel supply modules (200); The main pipeline (201), the branch pipeline (202) and the communication pipe (203) are all double-walled pipes, comprising a fuel protection passage (201a) outside and a fuel delivery passage (201b) inside.

4. A marine V-type methanol fuel engine fuel handling system as claimed in claim 3, characterized in that: The communication pipe (203) has a wave bending structure.

5. A marine V-type methanol fuel engine fuel handling system according to claim 3, characterized by: The fuel injection module (300) comprises a double-wall methanol injection valve (301), an air inlet pipe (302) and an air inlet pipe liquid discharge valve (303); The double-wall methanol injection valve (301) is connected with the branch pipe (202) in the fuel supply module (200), the double-wall methanol injection valve (301) is installed on the air inlet pipe (302) through the upper and lower sealing rings (301a), the top of the double-wall methanol injection valve (301) is provided with a leakage overflow port (301b), when the double-wall methanol injection valve (301) inside fails or the pressure rises sharply, the leakage overflow port (301b) opens, and the fuel is discharged in time, protecting the double-wall methanol injection valve (301) from fuel leakage or blockage caused by internal failure; The air inlet pipe (302) is provided with the air inlet pipe liquid discharge valve (303) at the bottom.

6. A marine V-type methanol fuel engine fuel handling system in accordance with claim 3 wherein: The leakage collection module (400) comprises a collection block (401), a connecting nut (402) and a collection pipe (403); The connecting nut (402) connects the branch pipe (202) in the fuel supply module (200) with the double-wall methanol injection valve (301) in the fuel injection module (300), the collection block (401) is arranged outside the connecting nut (402), and the lower end of the collection block (401) is in communication with the collection pipe (403); The branch pipe (202) and the connecting nut (402) are connected through a branch pipe sealing ring (404), and the branch pipe sealing ring (404) is provided with a sealing ring leakage hole (404a); The two ends of the collection block (401) and the connecting nut (402) are sealed and connected through a collection block O-shaped ring (401a) and a connecting nut O-shaped ring (402a) respectively.

7. A marine V-type methanol fuel engine fuel handling system according to claim 6, characterized by: The leakage alarm module (500) comprises a summary joint (501), a connecting pipe (502), a liquid level alarm device (503) and an oil tank (504); The two ends of the summary joint (501) are respectively connected with the connecting pipes (502), the two connecting pipes (502) are connected with the collection pipes (403) in the leakage collection modules (400) in the A and B columns respectively, one end of the liquid level alarm device (503) is connected with the summary joint (501), and the other end is connected with the oil tank (504); The summary joint (501), the liquid level alarm device (503) and the oil tank (504) are arranged from high to low, the leaked liquid fuel flows to the low liquid level alarm device (503), the flowing methanol fuel triggers the leakage alarm, and finally flows into the oil tank (504) to complete the leakage collection work.

8. A marine V-type methanol fuel engine fuel handling system in accordance with claim 3 wherein: The nitrogen blowing module (600) comprises a blowing block (601), a methanol manual liquid discharge valve (602), a sensor (603) and a shield (604); One end of the purge block (601) is connected with the main pipeline (201), the other end of the purge block (201) is connected with the shroud (604), the methanol manual liquid discharge valve (602) and the sensor (603) are located in the shroud (604), the methanol manual liquid discharge valve (602) is arranged in the main channel of the purge block (601), the sensor (603) is arranged in the exhaust channel of the purge block (201), the other side of the purge block (201) is provided with a nitrogen inlet, the purge block (201) is provided with two symmetrical air holes (601a), the air holes (601a) are communicated with the fuel protection passage (201a) in the main pipeline (201); The fuel delivery passage (201b) in the main pipeline (201) is communicated with the main channel of the purge block (601).

9. A marine V-type methanol fuel engine fuel handling system in accordance with claim 1 wherein: The forced exhaust module (700) comprises a combustion chamber (701), a starting motor (702), an exhaust pipe (703), a forced exhaust valve (704) and a centrifugal fan (705); The combustion chamber (701) inlet is connected with the air outlet of the air inlet pipe (302) of the fuel injection module (300), the combustion chamber (701) outlet is connected with the exhaust pipe (703), the exhaust pipe (703) is connected with the exhaust channel, the forced exhaust valve (704) and the centrifugal fan (705) are arranged outside the exhaust channel, the starting motor (702) is used for controlling the engine operation, opening the inlet and outlet channels of the combustion chamber (701), controlling the air to enter the exhaust channel and discharging the fuel.

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