Marine dual-fuel high-pressure methanol common rail injection system

Abstract

The utility model relates to a marine dual-fuel high-pressure methanol common rail injection system, and relates to the field of fuel injection systems, the marine dual-fuel high-pressure methanol common rail injection system comprises a methanol common rail pipe, the gas inlet end of the methanol common rail pipe is provided with a pressurization feeding assembly, and the gas outlet end of the methanol common rail pipe is provided with a flow limiting discharging assembly; a purging assembly is arranged on the side, close to the air inlet end, of the interior of the methanol common rail pipe, and a discharging assembly is arranged on the side wall of the methanol common rail pipe. The methanol injection system has the functions of stable methanol injection and purging discharge, so that the combustion efficiency of methanol fuel in an internal combustion engine is improved, emission is reduced, and the overall performance of the engine is improved.

Description

Technical Field

[0001] This application relates to the field of fuel injection systems, and in particular to a marine dual-fuel high-pressure methanol common rail injection system. Background Art

[0002] In the field of ships, marine high-power engines usually require fuel injection systems with large flow rates to meet the requirements of high-power output. In order to adapt to the use of new low-carbon fuels such as methanol and ammonia, it is necessary to develop fuel injection systems with large flow rates, high responsiveness, and high reliability. Large flow rate means that the fuel injection system can provide sufficient fuel flow rate to meet the fuel requirements of high-power engines. Marine high-power engines usually require a large amount of fuel supply, so the fuel injection system needs to have the ability of high flow rate. High responsiveness means that the fuel injection system can quickly respond to the requirements of engine load changes. During the navigation of ships, the load changes frequently, and the fuel injection system needs to be able to quickly adjust the fuel supply to maintain the stable operation of the engine. High reliability means that the fuel injection system can operate stably for a long time, and at the same time has low failure rate and maintenance cost. As a means of transportation operating at sea for a long time, ships need fuel injection systems with high reliability to ensure the safety and reliability of ships.

[0003] Regarding the above related technologies, the inventor believes that the combustion process of methanol in internal combustion engines is relatively complex, and precise control of fuel injection is required to achieve efficient combustion and low emissions. Due to the characteristics of methanol fuel itself, such as easy volatility and toxicity, the requirements for methanol common rail injection systems are relatively high, which increases the production, processing, and manufacturing difficulty and cost of methanol common rail systems. Summary of the Utility Model

[0004] In order to achieve stable methanol injection and purge and discharge functions, improve the combustion efficiency of methanol fuel in internal combustion engines, reduce emissions, and improve the overall performance of engines, this application provides a marine dual-fuel high-pressure methanol common rail injection system.

[0005] A marine dual-fuel high-pressure methanol common rail injection system provided by this application adopts the following technical solutions:

[0006] A marine dual-fuel high-pressure methanol common rail injection system includes a methanol common rail pipe. A pressurization feeding assembly is arranged at the intake end of the methanol common rail pipe, a flow-limiting discharging assembly is arranged at the outlet end of the methanol common rail pipe, a purging assembly is arranged on one side of the interior of the methanol common rail pipe close to the intake end, and a discharging assembly is arranged on the side wall of the methanol common rail pipe.

[0007] Optionally, the pressurization feeding assembly includes a methanol booster pump communicated with the intake end of the methanol common rail pipe, and a cut-off valve is arranged between the methanol booster pump and the methanol common rail pipe.

[0008] Optionally, the shut-off valve includes a shut-off valve body, a shut-off valve chamber is provided inside the shut-off valve body, a shut-off valve core is slidably connected inside the shut-off valve chamber, a first inlet end is provided on a side of the shut-off valve body relative to the methanol boost pump, a first outlet end is provided on a side of the shut-off valve body relative to the methanol common rail pipe, an active side wall of the shut-off valve core abuts and slides with the shut-off valve body relative to the inner side of the shut-off valve chamber, a first control component is arranged at the position of the shut-off valve core, and the first control component controls the gas inside the first inlet end to flow to the inside of the first outlet end.

[0009] Optionally, the first control component includes a first elastic member, a cut-off valve control groove is provided inside the cut-off valve core, the first elastic member is located in the cut-off valve control groove, the length of the cut-off valve chamber is greater than the length of the cut-off valve core, and a cut-off valve action groove is provided on an action side wall of the cut-off valve core. When the first elastic member is in a free state, the cut-off valve core is located at a first position, and the cut-off valve action groove is staggered with the first outlet end. When the first elastic member is in a compressed state, the cut-off valve core is located at a second position, and the cut-off valve action groove connects the first inlet end with the first outlet end.

[0010] Optionally, a shut-off valve control hole is formed at one end of the shut-off valve body located away from the first elastic member in the shut-off valve chamber, and the shut-off valve control hole is communicated with the shut-off valve chamber, and control gas is introduced into the shut-off valve control hole.

[0011] Optionally, the purge valve includes a purge valve body, a purge valve chamber is defined inside the purge valve body, the purge valve chamber includes a purge valve air inlet and a purge valve control unit, the purge valve control unit is internally slidably connected with a purge valve core, the purge valve core and one end of the purge valve air inlet seal the purge valve air inlet, a purge valve outlet is provided at one end of the purge valve body facing away from the purge valve air inlet, a second control component is provided inside the purge valve control unit, and the second control component controls the gas inside the purge valve air inlet to enter the purge valve control unit.

[0012] Optionally, the second control component includes a purge valve action groove provided on the side wall of the purge valve control part, the cross-section of the purge valve action groove is larger than the cross-section of the purge valve valve core, a purge valve control hole is provided inside the purge valve valve core, a second elastic member is provided inside the purge valve control hole, the purge valve control hole penetrates the end of the purge valve body away from the purge valve control part, a purge valve air inlet hole is provided at a position of the purge valve core opposite to the purge valve action groove, and the length of the purge valve control part is larger than the length of the purge valve valve core.

[0013] Optionally, the flow limiting discharge assembly includes a flow limiting valve, the flow limiting valve is connected to the outlet end of the methanol common rail pipe, and the outlet end of the flow limiting valve is connected to a methanol injector.

[0014] Optionally, the discharge assembly includes a discharge valve, and the discharge valve is connected to the interior of the methanol common rail pipe.

[0015] Optionally, the outlet end of the discharge valve is connected to a collection system, and the collection system collects the gas discharged from the discharge valve.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] 1. Simple structure, easy to install; good sealing effect and leak detection; high reliability; can realize high-pressure methanol transportation and stable injection; can be expanded to apply to a variety of similar low-carbon fuels.

[0018] 2. The purge valve 04 is integrated inside the high-pressure methanol common rail pipe. When the main engine switches from methanol mode to diesel mode or an alarm signal appears in the control system, the purge valve is required to purge the methanol to ensure that there is no methanol residue in the methanol injection system.

[0019] 3. The release valve introduces control air. On the one hand, it limits the pressure in the high-pressure methanol common rail pipe under normal working mode. When the pressure of methanol fuel exceeds a certain threshold, it automatically opens to reduce the pressure in the high-pressure methanol common rail pipe. On the other hand, when the main engine is shut down or switched to other modes, the purge valve cooperates with the methanol in the methanol common rail pipe and methanol injector to release the methanol to the methanol collection system to ensure the safe operation of the main engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a marine dual-fuel high-pressure methanol common rail injection system in an embodiment of the present application.

[0021] Figure 2 It is a cross-sectional view of a shut-off valve of a marine dual-fuel high-pressure methanol common rail injection system in an embodiment of the present application.

[0022] Figure 3It is a cross-sectional view of a purge valve of a marine dual-fuel high-pressure methanol common rail injection system in an embodiment of the present application.

[0023] Description of reference numerals: 1, methanol common rail pipe; 2, supercharging feed assembly; 21, cut-off valve; 211, cut-off valve body; 212, first inlet end; 213, first outlet end; 214, cut-off valve chamber; 215, cut-off valve control hole; 216, cut-off valve spool; 217, cut-off valve action groove; 218, cut-off valve control groove; 219, first spring; 22, methanol supercharging pump; 3, restricted outflow discharge assembly; 31, flow-limiting valve; 32, methanol injector; 4, purge and discharge assembly; 41, purge valve; 411, purge valve body; 412, purge valve chamber; 4121, purge valve air intake part; 4122, purge valve control part; 413, purge valve spool; 4131, first spool part; 4132, second spool part; 414, purge valve action groove; 415, purge valve control hole; 416, purge valve air outlet hole; 417, second spring; 418, purge valve air intake hole; 42, relief valve. Detailed implementation manners

[0024] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0025] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0026] The following is further described with reference to the attached Figures 1-3 This application is further described in detail.

[0027] An embodiment of the present application discloses a marine dual-fuel high-pressure methanol common rail injection system. Refer to Figure 1A dual-fuel high-pressure methanol common rail injection system for ships includes a methanol common rail pipe 1. A boost feed assembly 2 is provided at the air inlet end of the methanol common rail pipe 1. The boost feed assembly 2 injects the methanol gas at the air inlet end into the air inlet end of the methanol common rail pipe 1. A limited flow discharge assembly 3 is provided at the air outlet end of the methanol common rail pipe 1. The limited flow discharge assembly 3 is located at the end of the methanol common rail pipe 1 away from the boost feed assembly 2, and the limited flow discharge assembly 3 causes the methanol inside the methanol common rail pipe 1 to flow out. A purge and discharge assembly 4 is provided inside the methanol common rail pipe 1. When the pressure inside the methanol common rail pipe 1 exceeds a set value, the purge and discharge assembly 4 discharges the methanol inside the methanol common rail pipe 1. When the main engine switches from the methanol mode to the diesel mode or an alarm signal appears in the control system, the purge and discharge assembly 4 blows the methanol inside the methanol common rail pipe 1 clean to ensure that there is no methanol residue inside the methanol injection system.

[0028] The side along the gas inlet end to the gas outlet end of the methanol common rail pipe 1 is the flow direction of the methanol medium inside the methanol common rail pipe 1 .

[0029] The pressurized feed assembly 2 includes a cut-off valve 21, which is located at one side of the air inlet end of the methanol common rail pipe 1, and the cut-off valve 21 is fixedly connected and relatively communicated with the air inlet end of the methanol common rail pipe 1. A methanol booster pump 22 is provided at the air inlet end of the cut-off valve 21, and the methanol booster pump 22 pressurizes the methanol medium and enters the interior of the cut-off valve 21. Whether the methanol medium enters the interior of the methanol common rail pipe 1 is determined by the control of the cut-off valve 21.

[0030] Reference Figure 1 , Figure 2 The cut-off valve 21 includes a cut-off valve body 211, a first inlet end 212 is provided on one side of the cut-off valve body 211, and the first inlet end 212 is relatively connected to the outlet end of the methanol booster pump 22, and a first outlet end 213 is provided on one side of the cut-off valve body 211, and the first outlet end 213 is relatively connected to the intake end of the methanol common rail pipe 1. The first inlet end 212 and the first outlet end 213 are staggered.

[0031] A cut-off valve chamber 214 is provided inside the cut-off valve body 211, and the inside of the cut-off valve chamber 214 is relatively communicated with the first inlet end 212, and the inside of the cut-off valve chamber is communicated with the first outlet end 213. A cut-off valve control hole 215 is also provided on the side wall of the cut-off valve body 211, and the cut-off valve control hole 215 is relatively communicated with the inside of the cut-off valve chamber 214, and an external pipeline is connected to the side wall of the cut-off valve body 211 at a position relative to the cut-off valve control hole 215, and the external pipeline can inject control gas into the inside of the cut-off valve control hole 215, and then enter the inside of the cut-off valve chamber 214.

[0032] Inside the cut-off valve chamber 214, a cut-off valve spool 216 is horizontally slidably connected. The side wall of the cut-off valve spool 216 abuts against and relatively slides with respect to the inner side wall of the cut-off valve body 211 relative to the cut-off valve chamber 214. The side wall of the cut-off valve spool 216 closes off the first inlet end 212 from the inside of the cut-off valve chamber 214, and the side wall of the cut-off valve spool 216 closes off the first outlet end 213 from the inside of the cut-off valve chamber 214.

[0033] At the position of the side wall of the cut-off valve spool 216 relative to the first inlet end 212, a cut-off valve action groove 217 is provided. The cut-off valve action groove 217 is an annular groove body, and the axis of the cut-off valve action groove 217 is coaxially arranged with the axis of the cut-off valve spool 216. The length of the cut-off valve action groove 217 along the axis direction of the cut-off valve spool 216 is greater than the diameter of the first inlet end 212 of the cut-off valve 21.

[0034] Inside the cut-off valve spool 216, a cut-off valve control groove 218 is coaxially provided. Inside the cut-off valve control groove 218, a first spring 219 is coaxially arranged. One end of the first spring 219 is fixedly connected to the inside of the cut-off valve spool 216, and the other end of the first spring 219 extends out from the inside of the cut-off valve control groove 218 and abuts against the side wall of the cut-off valve body 211. The length of the cut-off valve spool 216 along its axis direction is less than the length inside the cut-off valve chamber 214.

[0035] When the first spring 219 is in a free state, the cut-off valve spool 216 is located at the first position inside the cut-off valve chamber 214. At this time, the end wall of the cut-off valve spool 216 close to the cut-off valve control hole 215 abuts against the side wall of the cut-off valve chamber 214 close to the control hole, and the cut-off valve control hole 215 is completely closed by the cut-off valve spool 216. At this time, the side of the cut-off valve action groove 217 facing away from the cut-off valve control hole 215 is relatively communicated with the first inlet end 212, and the cut-off valve action groove 217 is staggered from the first outlet end 213. The gas inside the first inlet end 212 enters into the inside of the cut-off valve action groove 217 and cannot enter into the inside of the first outlet end 213. The high-pressure methanol gas inside the methanol booster pump 22 cannot enter into the inside of the methanol common rail pipe 1 through the cut-off valve 21.

[0036] When the first spring 219 is in a free state, the cut-off valve spool 216 is located at the second position inside the cut-off valve chamber 214. At this time, there is a gap between the side end wall of the cut-off valve spool 216 close to the cut-off valve control hole 215 and the side wall of the cut-off valve chamber 214 close to the control hole. At this time, the cut-off valve action groove 217 is relatively communicated with the first inlet end 212 on the side close to the cut-off valve control hole 215, and the side of the cut-off valve action groove 217 facing away from the cut-off valve control hole 215 is relatively communicated with the first outlet end 213. The medium located inside the first inlet end 212 enters the inside of the first outlet end 213 through the cut-off valve action groove 217 to achieve communication, so that the high-pressure methanol gas located inside the methanol booster pump 22 enters the inside of the methanol common rail pipe 1 through the cut-off valve 21.

[0037] The movement of the cut-off valve spool 216 between the first position and the second position inside the cut-off valve chamber 214 is realized by the pressure of the control gas located inside the cut-off valve control hole 215. When the gas pressure inside the cut-off valve control hole 215 is greater than the elastic force of the first spring 219, the high-pressure control gas inside the cut-off valve control hole 215 pushes the cut-off valve spool 216 to move towards the end away from the cut-off valve control hole 215, moving the cut-off valve spool 216 from the first position to the second position. When the gas pressure inside the cut-off valve control hole 215 is less than the elastic force of the first spring 219, the first spring 219 pushes the cut-off valve spool 216 to move towards the side close to the cut-off valve control hole 215, moving the cut-off valve spool 216 from the second position to the first position.

[0038] The flow-limiting discharge assembly 3 includes a flow-limiting valve 31. The inlet end of the flow-limiting valve 31 is fixedly connected and relatively communicated with the outlet end of the methanol common rail pipe 1. A methanol injector 32 is also provided at the outlet end of the flow-limiting valve 31. The inlet end of the methanol injector 32 is fixedly connected and relatively communicated with the outlet end of the flow-limiting valve 31. The methanol gas located inside the methanol common rail pipe 1 can gradually enter the inside of the methanol injector 32 through the flow-limiting control of the flow-limiting valve 31 to ensure the stable injection of the methanol injector 32.

[0039] Refer to Figure 1 、 Figure 3 As shown in, the purge and relief assembly 4 includes a purge valve 41 provided at the inner end of the methanol common rail pipe 1 near the intake end, and a relief valve 42 provided at the outlet end of the methanol common rail pipe 1. One end of the purge valve 41 is relatively connected to the external purge pipeline, and the other end of the purge valve 41 is fixedly connected and relatively communicated with the internal pipeline of the methanol common rail pipe 1. One end of the relief valve 42 is fixedly connected and relatively communicated with the internal pipeline of the methanol common rail pipe 1, and the other end of the relief valve 42 is relatively connected to the external gas collection and treatment equipment.

[0040] When the main engine is switched from methanol mode to diesel mode or an alarm signal appears in the control system, the purge valve 41 is required to purge the methanol involved to ensure that there is no methanol residue in the methanol injection system, and the purged gas is discharged from the inside of the discharge valve 42.

[0041] The release valve 42 is fed with control air. On the one hand, it limits the pressure in the high-pressure methanol common rail pipe 1 in the normal working mode. When the pressure of the methanol fuel exceeds a certain threshold, it automatically opens to reduce the pressure in the high-pressure methanol common rail pipe 1. On the other hand, when the host is shut down or switched to other modes, it cooperates with the purge valve 41 to release the methanol in the methanol common rail pipe 1 and the methanol injector 32 to the methanol collection system to ensure the safe operation of the host. The release valve 42 and the cut-off valve 21 can immediately cut off and release the methanol fuel in the event of power failure, which improves the overall safety of the high-pressure methanol common rail injection system.

[0042] The purge valve 41 includes a purge valve body 411, a purge valve chamber 412 is provided inside the purge valve body 411, the purge valve chamber 412 includes a purge valve air inlet portion 4121 for air intake and a purge valve control portion 4122, the purge valve air inlet portion 4121 is relatively connected to an external purge gas pipeline, and the purge gas enters the interior of the purge valve chamber 412 from the purge valve air inlet portion 4121.

[0043] A purge valve core 413 is horizontally slidably connected inside the purge valve chamber 412. The purge valve core 413 includes a first valve core portion 4131 close to the purge valve air inlet portion 4121 and a second valve core portion 4132 away from the purge valve air inlet portion 4121. The first valve core portion 4131 and the second valve core portion 4132 are fixedly connected. The first valve core portion 4131 is a conical structure, and the side wall of the first valve core portion 4131 away from the second valve core portion 4132 abuts against the side wall of the purge valve air inlet portion 4121. The outer diameter of the first valve core portion 4131 is greater than the inner diameter of the purge valve air inlet portion 4121, so that when the first valve core portion 4131 abuts against the side wall of the purge valve air inlet portion 4121, the purge valve air inlet portion 4121 is closed by the first valve core portion 4131.

[0044] A purge valve action groove 414 is provided on the side of the purge valve body 411 relative to the purge valve control part 4122 close to the purge valve air inlet part 4121. The purge valve action groove 414 is an annular groove body, and the groove body of the purge valve action groove 414 is relatively connected to the purge valve control part 4122, and the outer diameter of the purge valve action groove 414 is larger than the outer diameter of the purge valve control part 4122.

[0045] A purge valve control hole 415 is coaxially opened inside the second valve core portion 4132 of the purge valve core 413, and the purge valve control hole 415 penetrates the end wall of the second valve core portion 4132 of the purge valve 41 away from the first valve core portion 4131, and a purge valve air outlet hole 416 is opened on the side wall of the purge valve body 411 at a position relative to the purge valve control hole 415, and the purge valve air outlet hole 416 is relatively connected to the interior of the purge valve control hole 415.

[0046] A second spring 417 is coaxially arranged inside the purge valve control hole 415, one end of the second spring 417 is fixedly connected to the purge valve core 413, and the other end of the second spring 417 extends from the inside of the purge valve core 413 to abut against the side wall of the purge valve body 411. An end of the purge valve core 413 that is away from the purge valve air inlet portion 4121 is spaced from the inner side wall of the purge valve body 411. A purge valve air inlet hole 418 is provided at a position of the purge valve core 413 relative to the purge valve action groove 414, and the purge valve air inlet hole 418 relatively connects the inside of the purge valve action groove 414 with the inside of the purge valve control hole 415.

[0047] When the second spring 417 is in a free state, the first valve core portion 4131 of the purge valve 41 closes the purge valve air inlet portion 4121 , and the purge gas inside the purge valve air inlet portion 4121 cannot enter the purge valve action groove 414 .

[0048] When the second spring 417 is in a compressed state, the first valve core portion 4131 of the purge valve 41 is pushed open by the high-pressure purge gas located inside the purge valve inlet portion 4121, so that the purge valve inlet portion 4121 is connected to the purge valve action groove 414, and the purge gas located inside the purge valve inlet portion 4121 enters the interior of the action portion of the purge valve 41, and enters the interior of the purge valve control hole 415 through the purge valve inlet hole 418, and then enters the interior of the methanol common rail pipe 1 from the purge valve outlet hole 416 for purging.

[0049] In this application, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0050] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A marine dual-fuel high-pressure methanol common rail injection system, characterized in that: The invention comprises a methanol common rail pipe (1), wherein a boost feed assembly (2) is arranged at the air inlet end of the methanol common rail pipe (1), wherein the boost feed assembly (2) comprises a methanol boost pump (22) connected to the air inlet end of the methanol common rail pipe (1), wherein a limited flow discharge assembly (3) is arranged at the air outlet end of the methanol common rail pipe (1), wherein the limited flow discharge assembly (3) comprises a limited flow valve (31), wherein a purge assembly is arranged on a side of the interior of the methanol common rail pipe (1) close to the air inlet end, wherein the purge assembly comprises a purge valve body (411), wherein a purge valve chamber (412) is provided inside the purge valve body (411), and wherein a discharge assembly is arranged on the side wall of the methanol common rail pipe (1), wherein the discharge assembly comprises a discharge valve (42).

2. The marine dual-fuel high-pressure methanol common rail injection system according to claim 1 is characterized in that: A cut-off valve (21) is provided between the methanol booster pump (22) and the methanol common rail pipe (1).

3. The marine dual-fuel high-pressure methanol common rail injection system according to claim 2 is characterized in that: The shut-off valve (21) comprises a shut-off valve body (211), a shut-off valve chamber (214) is provided inside the shut-off valve body (211), a shut-off valve core (216) is slidably connected inside the shut-off valve chamber (214), a first inlet end (212) is provided on a side of the shut-off valve body (211) relative to the methanol booster pump (22), a first outlet end (213) is provided on a side of the shut-off valve body (211) relative to the methanol common rail pipe (1), an active side wall of the shut-off valve core (216) abuts and slides against the inner side of the shut-off valve body (211) relative to the shut-off valve chamber (214), and a first control component is provided at the position of the shut-off valve core (216), and the first control component controls the gas inside the first inlet end (212) to flow to the inside of the first outlet end (213).

4. The marine dual-fuel high-pressure methanol common rail injection system according to claim 3 is characterized in that: The first control component comprises a first elastic member, a cut-off valve control groove (218) is provided inside the cut-off valve core (216), the first elastic member is located in the cut-off valve control groove (218), the length of the cut-off valve chamber (214) is greater than the length of the cut-off valve core (216), and a cut-off valve action groove (217) is provided on the action side wall of the cut-off valve core (216); when the first elastic member is in a free state, the cut-off valve core (216) is located at a first position, and the cut-off valve action groove (217) is staggered with the first outlet end (213); when the first elastic member is in a compressed state, the cut-off valve core (216) is located at a second position, and the cut-off valve action groove (217) connects the first inlet end (212) with the first outlet end (213).

5. The marine dual-fuel high-pressure methanol common rail injection system according to claim 4 is characterized in that: The shut-off valve body (211) is provided with a shut-off valve control hole (215) at one end of the shut-off valve chamber (214) away from the first elastic member. The shut-off valve control hole (215) is communicated with the shut-off valve chamber (214), and control gas is introduced into the shut-off valve control hole (215).

6. The marine dual-fuel high-pressure methanol common rail injection system according to claim 1, characterized in that: The purge valve chamber (412) includes a purge valve air inlet (4121) and a purge valve control part (4122), the purge valve control part (4122) is slidably connected to a purge valve core (413), the purge valve core (413) and one end of the purge valve air inlet (4121) seal the purge valve air inlet (4121), a purge valve air outlet (416) is provided at one end of the purge valve body (411) facing away from the purge valve air inlet (4121), and a second control component is provided inside the purge valve control part (4122), and the second control component controls the gas inside the purge valve air inlet (4121) to enter the inside of the purge valve control part (4122).

7. The marine dual-fuel high-pressure methanol common rail injection system according to claim 6, characterized in that: The second control component includes a purge valve action groove (414) provided on the side wall of the purge valve control portion (4122); the cross-section of the purge valve action groove (414) is larger than the cross-section of the purge valve valve core (413); a purge valve control hole (415) is provided inside the purge valve valve core (413); a second elastic member is provided inside the purge valve control hole (415); the purge valve control hole (415) penetrates the end of the purge valve body (411) away from the purge valve control portion (4122); a purge valve air inlet hole (418) is provided at a position of the purge valve core (413) opposite to the purge valve action groove (414); the length of the purge valve control portion (4122) is larger than the length of the purge valve valve core (413).

8. The marine dual-fuel high-pressure methanol common rail injection system according to claim 1, characterized in that: The flow limiting valve (31) is connected to the outlet end of the methanol common rail pipe (1), and the outlet end of the flow limiting valve (31) is connected to a methanol injector (32).

9. The marine dual-fuel high-pressure methanol common rail injection system according to claim 1, characterized in that: The discharge valve (42) is in communication with the interior of the methanol common rail pipe (1).

10. The marine dual-fuel high-pressure methanol common rail injection system according to claim 9, characterized in that: The outlet end of the discharge valve (42) is connected to a collection system, and the collection system collects the gas discharged by the discharge valve (42).

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