A marine engine fuel supply control valve group skid-mounted device

Abstract

The utility model relates to marine engine production technical field, and specifically is a marine engine fuel supply control valve group prying equipment, including prying equipment main part, the prying equipment main part includes F1 fuel supply valve group, F2 high pressure nitrogen valve group, F3 low pressure nitrogen valve group, F4 purging nitrogen valve group, F5 cold water inlet valve group and E1 electric heater, the prying equipment main part outside is provided with and F1 fuel supply valve group feed end intercommunication's N1 interface, and F1 fuel supply valve group outer periphery fuel export passes through N2 interface with engine feed end intercommunication, the F1 fuel supply valve group outer periphery gas end is provided with and is located the N13 interface of prying equipment main part outside, and N13 interface and exhaust gas treatment system intercommunication, utilize pneumatic double to shut off and discharge (DBB) valve instead of welding valve group and carry out prying combination again, reduce equipment space occupation 50%, reduce the leakage probability, improve the security simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of marine engine manufacturing technology, specifically to a skid-mounted device for a marine engine fuel supply control valve assembly. Background Technology

[0002] As countries around the world place increasing emphasis on environmental protection, emission standards have been raised to reduce the impact of carbon emissions on the ocean, placing higher demands on the shipping industry, which has the greatest impact on marine carbon emissions. Marine engine fuels are constantly being updated and replaced, from primary marine fuel oil to methanol and then to liquefied natural gas (LNG), and now liquid ammonia is being used as fuel to minimize carbon emissions and thus reduce their impact on the ocean.

[0003] Marine engines using the aforementioned fuels require a control valve assembly to regulate the fuel system before fuel enters the engine. This system is a skid-mounted assembly consisting of multiple single-valve combinations of three-way valves. This results in a large space requirement and numerous welding points, leading to a higher probability of leakage. Safety becomes paramount when using flammable, explosive, or toxic fuels (LNG, liquid ammonia). Therefore, we propose a skid-mounted fuel supply control valve assembly for marine engines. Utility Model Content

[0004] To address the problems in the existing technology, this utility model provides a skid-mounted device for a marine engine fuel supply control valve assembly. It uses a pneumatic double shut-off (DBB) valve to replace the welded valve assembly for skid-mounted assembly, reducing the equipment space occupation by 50%, while reducing the probability of leakage and improving safety.

[0005] The technical solution adopted by this utility model to solve its technical problem is a skid-mounted device for a marine engine fuel supply control valve group, including a skid-mounted device body. The skid-mounted device body includes an F1 fuel supply valve group, an F2 high-pressure nitrogen valve group, an F3 low-pressure nitrogen valve group, an F4 purge nitrogen valve group, an F5 cold water inlet valve group, and an E1 electric heater. An N1 interface connected to the feed end of the F1 fuel supply valve group is provided on the outer side of the skid-mounted device body, and the fuel outlet of the F1 fuel supply valve group is connected to the engine feed end through an N2 interface. An N13 interface located on the outer side of the F1 fuel supply valve group is provided at the exhaust outlet end, and the N13 interface is connected to the exhaust gas treatment system. The F2 high-pressure nitrogen... Both the gas valve group and the F3 low-pressure nitrogen valve group have two sets of outlets on their outer periphery. One set of outlets of the F2 high-pressure nitrogen valve group and one set of outlets of the F3 low-pressure nitrogen valve group are connected to the inlet of the F1 fuel supply valve group via conduits. The other set of outlets of the F2 high-pressure nitrogen valve group is connected to the other set of outlets of the F3 low-pressure nitrogen valve group via conduits and then connected to the inlet of the E1 electric heater. The outlet of the E1 electric heater is connected to the inlet of the F4 purge nitrogen valve group via a conduit. The F4 purge nitrogen valve group has two sets of outlets on its outer periphery. One set of outlets of the F4 purge nitrogen valve group is connected to the fuel outlet main pipe of the F1 fuel supply valve group. The other set of outlets of the F4 purge nitrogen valve group is connected to the exhaust gas recovery system via the N12 interface. The skid-mounted equipment has an N10 interface on its outer periphery that connects to the inlet end of the F5 cold water inlet valve group. The F5 cold water inlet valve group has two outlets on its outer periphery. One outlet of the F5 cold water inlet valve group is connected to the fuel outlet main pipe of the F1 fuel supply valve group, and the other outlet of the F5 cold water inlet valve group is connected to the air inlet end of the exhaust gas recovery system through an N11 interface.

[0006] Specifically, the skid-mounted equipment body also includes an F6 fuel return valve assembly, an F7 cold water return valve assembly, and an F8 fuel leak valve assembly. An N8 interface for guiding engine fuel return is provided on the outer side of the skid-mounted equipment body. Two sets of outlets are provided on the inner side of the N8 interface. One set of outlets is connected to the F6 fuel return valve assembly via a conduit, and the other set of outlets is connected to the F7 cold water return valve assembly via a conduit. The outer peripheral outlets of the F6 fuel return valve assembly, the F7 cold water return valve assembly, and the F8 fuel leak valve assembly are also described. Each outlet is equipped with two sets. One set of outlets of the F6 fuel return valve group is connected to the fuel recovery tank through the N7 interface, and the other set of outlets of the F6 fuel return valve group is connected to one set of outlets of the F8 fuel leak valve group through a conduit and then connected to the exhaust gas recovery system through the N9 interface. One set of outlets of the F7 cold water return valve group is connected to the other set of outlets of the F8 fuel leak valve group through a conduit and then connected to the exhaust gas recovery system through the N14 interface. The other set of outlets of the F7 cold water return valve group is connected to the cold water system through the N15 interface.

[0007] Specifically, the skid-mounted equipment has an N5 interface on its outer periphery for guiding the leakage gas from the drilling machine, and the N5 interface is connected to the F8 fuel leakage valve group through a conduit.

[0008] Specifically, the skid-mounted equipment has N3 and N4 ports on its outer periphery for guiding flow. The N3 ports have two sets of outlets on their inner side. One set of outlets of the N3 ports is connected to the outlet of the F6 fuel return valve group through a conduit, and the other set of outlets of the N3 ports is connected to the F2 high-pressure nitrogen valve group through a conduit. The N4 ports are connected to the F3 low-pressure nitrogen valve group through a conduit.

[0009] Specifically, the skid-mounted equipment body has an N16 interface for venting on one side of its outer perimeter, and an N6 interface connected to the N18 interface on the same side of its outer perimeter. The end of the N6 interface furthest from the N18 interface is connected to the exhaust gas treatment system via a conduit.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The technical solution of this application, through the design of F1 fuel supply valve group, F2 high-pressure nitrogen valve group, F3 low-pressure nitrogen valve group, F4 purging nitrogen valve group, F5 cold water inlet valve group, F6 fuel return valve group, F7 cold water return valve group, F8 fuel leakage valve group and E1 electric heater, utilizes pneumatic double shut-off (DBB) valves to replace welded valve groups for skid-mounted assembly, reducing equipment space occupation by 50%, while reducing leakage probability and improving safety. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the overall structural distribution of this utility model; Figure 2 This is a schematic diagram of the overall structural distribution of this utility model from direction A. Figure 3 This is a schematic diagram of the overall structural distribution of this utility model in direction B; Figure 4 This is a schematic diagram of the overall structural distribution of this utility model; In the diagram: 1. Skid-mounted equipment main body; 2. F1 fuel supply valve assembly; 3. F2 high-pressure nitrogen valve assembly; 4. F3 low-pressure nitrogen valve assembly; 5. F4 purging nitrogen valve assembly; 6. F5 cold water inlet valve assembly; 7. F6 fuel return valve assembly; 8. F7 cold water return valve assembly; 9. F8 fuel leakage valve assembly; 10. E1 electric heater; 11. N1 interface; 12. N2 interface; 13. N3 interface; 14. N4 interface; 15. N5 interface; 16. N6 interface; 17. N7 interface; 18. N8 interface; 19. N9 interface; 20. N10 interface; 21. N11 interface; 22. N12 interface; 23. N13 interface; 24. N14 interface; 25. N15 interface; 26. N16 interface. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0014] Please see Figure 1-4 This utility model provides a technical solution: a skid-mounted device for a marine engine fuel supply control valve group, including a skid-mounted device body 1. The skid-mounted device body 1 includes an F1 fuel supply valve group 2, an F2 high-pressure nitrogen valve group 3, an F3 low-pressure nitrogen valve group 4, an F4 purge nitrogen valve group 5, an F5 cold water inlet valve group 6, and an E1 electric heater 10. An N1 interface 11 connected to the feed end of the F1 fuel supply valve group 2 is provided on the outside of the skid-mounted device body 1, and the fuel outlet of the F1 fuel supply valve group 2 is connected to the engine feed end through an N2 interface 12. An N13 interface 23 located on the outside of the skid-mounted device body 1 is provided at the exhaust outlet of the F1 fuel supply valve group 2, and the N13 interface 23 is connected to the exhaust gas treatment system. The F2 high-pressure nitrogen valve... Two sets of outlets are provided on the outer periphery of both Group 3 and F3 low-pressure nitrogen valve group 4. One set of outlets of F2 high-pressure nitrogen valve group 3 and one set of outlets of F3 low-pressure nitrogen valve group 4 are connected to the inlet of F1 fuel supply valve group 2 through conduits. The other set of outlets of F2 high-pressure nitrogen valve group 3 is connected to the other set of outlets of F3 low-pressure nitrogen valve group 4 through conduits and is connected to the inlet of E1 electric heater 10. The outlet of E1 electric heater 10 is connected to the inlet of F4 purge nitrogen valve group 5 through conduits. Two sets of outlets are provided on the outer periphery of F4 purge nitrogen valve group 5. One set of outlets of F4 purge nitrogen valve group 5 is connected to the fuel outlet main pipe of F1 fuel supply valve group 2. The other set of outlets of F4 purge nitrogen valve group 5 is connected to the exhaust gas recovery system through N12 interface 22. The skid-mounted equipment body 1 is provided with an N10 interface 20 on its outer periphery, which is connected to the inlet end of the F5 cold water inlet valve group 6. The F5 cold water inlet valve group 6 has two outlets on its outer periphery. One of the outlets of the F5 cold water inlet valve group 6 is connected to the fuel outlet main pipe of the F1 fuel supply valve group 2, and the other outlet of the F5 cold water inlet valve group 6 is connected to the air inlet end of the exhaust gas recovery system through an N11 interface 21. The skid-mounted equipment body 1 also includes an F6 fuel return valve assembly 7, an F7 cold water return valve assembly 8, and an F8 fuel leak valve assembly 9. An N8 interface 18 for guiding engine return fuel is provided on the outer side of the skid-mounted equipment body 1. Two sets of outlets are provided on the inner side of the N8 interface 18. One set of outlets of the N8 interface 18 is connected to the F6 fuel return valve assembly 7 via a conduit, and the other set of outlets of the N8 interface 18 is connected to the F7 cold water return valve assembly 8 via a conduit. The outer peripheral outlets of the F6 fuel return valve assembly 7, F7 cold water return valve assembly 8, and F8 fuel leak valve assembly 9 are also provided. Each is equipped with two sets, and one set of outlets of the F6 fuel return valve group 7 is connected to the fuel recovery tank through the N7 interface 17, and the other set of outlets of the F6 fuel return valve group 7 is connected to one set of outlets of the F8 fuel leak valve group 9 through a conduit and is connected to the exhaust gas recovery system through the N9 interface 19. One set of outlets of the F7 cold water return valve group 8 is connected to the other set of outlets of the F8 fuel leak valve group 9 through a conduit and is connected to the exhaust gas recovery system through the N14 interface 24, and the other set of outlets of the F7 cold water return valve group 8 is connected to the cold water system through the N15 interface 25. The skid-mounted equipment body 1 is provided with an N5 interface 15 for guiding the leakage gas of the drilling machine on its outer periphery, and the N5 interface 15 is connected to the F8 fuel leakage valve group 9 through a conduit; The skid-mounted equipment body 1 is provided with N3 interface 13 and N4 interface 14 for guiding flow on its outer periphery. There are two sets of outlets on the inner side of N3 interface 13. One set of outlets of N3 interface 13 is connected to the outlet of F6 fuel return valve group 7 through a conduit, and the other set of outlets of N3 interface 13 is connected to F2 high pressure nitrogen valve group 3 through a conduit. N4 interface 14 is connected to F3 low pressure nitrogen valve group 4 through a conduit. The skid-mounted equipment body 1 has an N16 interface 26 for venting on one side of its outer perimeter, and an N6 interface 16 connected to the N18 interface on one side of its outer perimeter. The end of the N6 interface 16 away from the N18 interface is connected to the exhaust gas treatment system through a conduit.

[0015] The working principle and usage process of this utility model: After the external fuel enters the skid-mounted equipment through the N1 interface 11 of the pipeline, it first enters the F1 fuel supply valve group 2. This valve group, as the core control unit of fuel supply, realizes precise regulation of fuel flow and bidirectional cut-off protection through the pneumatic double shut-off discharge (DBB) structure, avoiding accidental leakage during fuel transportation. The fuel after being controlled by the F1 fuel supply valve group 2 is divided into two paths: one path is directly transported to the marine engine through the N2 interface 12 to meet the combustion power requirements of the engine, and the other path is discharged into the exhaust gas treatment system through the N13 interface 23. This path is designed to deal with special situations such as excessive fuel supply and abnormal pressure, to avoid excess fuel from accumulating in the system and causing safety risks, and to achieve dynamic balance of fuel transportation. To ensure the safety and stability of the main fuel supply process, the equipment is equipped with four auxiliary systems: high-pressure nitrogen, low-pressure nitrogen, electric heating, and cold water. These systems are responsible for purging, heating, and cleaning, respectively. Through precise control of each valve group, the equipment protects and maintains the main fuel pipeline and key components. The nitrogen purging system uses the combined action of high-pressure and low-pressure nitrogen to purge the "front" and "rear" ends of the fuel main pipeline and key valve groups, removing residual fuel or impurities from the pipeline and preventing safety hazards caused by fuel mixing with air. The specific process is as follows: High-pressure nitrogen branch: After entering the equipment through N3 interface 13, external high-pressure nitrogen is divided into two paths: one path is directly connected to the outlet of F6 fuel return valve group 7 to purge the fuel return pipeline and prevent residual fuel from solidifying or deteriorating in the pipeline; the other path enters F2 high-pressure nitrogen valve group 3, and after being controlled by the valve group, it is divided again: one path is connected to the main fuel pipeline before F1 fuel supply valve group 2 to purge residual air or impurities in the main pipeline to ensure the purity of fuel delivery; the other path merges with the low-pressure nitrogen branch and enters the electric heating system. Low-pressure nitrogen branch: After entering the equipment through N4 interface 14, external low-pressure nitrogen first enters F3 low-pressure nitrogen valve group 4. After the pressure is regulated by the valve group, it is split into two: one branch is also connected to the main fuel line before F1 fuel supply valve group 2, which works with high-pressure nitrogen to achieve "high and low pressure coordinated purging" to adapt to the pipeline cleaning needs under different working conditions; the other branch merges with the output branch of F2 high-pressure nitrogen valve group 3 and enters E1 electric heater 10 together. Nitrogen purging after heating: The combined nitrogen gas is heated to a set temperature by the E1 electric heater 10 (to meet the fuel flow requirements or special purging temperature requirements in low-temperature environments), and then enters the F4 purging nitrogen valve group 5. After being controlled by the valve group, it is split into two streams: one stream is connected to the main fuel pipeline after the F1 fuel supply valve group 2 to purge the end pipeline of the fuel delivery system and ensure that there is no residual fuel in the pipeline; the other stream enters the exhaust gas recovery system through the N12 interface 22 to avoid direct emission of heated nitrogen gas, which would cause energy waste or environmental impact. The cooling water system is mainly used to clean the rear end of the main fuel pipeline and key components to prevent fuel residue from adhering to the inner wall of the pipeline, affecting fuel delivery efficiency or causing pipeline blockage. The specific process is as follows: After external cold water enters the equipment through N10 interface 20, it first enters F5 cold water inlet valve group 6. After the flow and pressure are regulated by the valve group, it is divided into two paths: one path is connected to the fuel main pipeline after F1 fuel supply valve group 2 to flush the inner wall of the pipeline and remove residual fuel or impurities; the other path enters the exhaust gas recovery system through N11 interface 21 to avoid direct discharge of wastewater after cleaning and causing pollution. The equipment is designed with independent recovery and treatment processes for "engine fuel return" and "engine leaked gas". Through multi-valve group coordinated control, it realizes fuel recycling and safe treatment of harmful gases, eliminating the risk of leakage, as detailed below: The unconsumed fuel from the engine enters the equipment through interface N818 and is then split into two paths: Fuel return and recovery branch: One branch enters the F6 fuel return valve group 7, and after being controlled by the valve group, it is split into two branches: one branch is sent to the fuel recovery tank through the N7 interface 17 to realize the recycling of unconsumed fuel and reduce fuel loss; the other branch merges with the output branch of the F8 fuel leakage valve group 9 and enters the exhaust gas treatment system through the N9 interface 19 to treat the small amount of volatile gases or impurities contained in the returned fuel. Cold water co-processing branch: Another branch returns fuel to the F7 cold water return valve group 8, working in conjunction with the cold water system to achieve "fuel-cold water heat exchange" (adapting to fuel temperature regulation requirements). After being controlled by the valve group, it is split: one branch enters the exhaust gas recovery system through the N14 interface 24 to treat the small amount of volatile gases generated after the fuel comes into contact with the cold water; the other branch returns to the cold water system through the N15 interface 25 to achieve the recycling of cold water and reduce water consumption. Leakage gas generated during engine operation (containing flammable and explosive components such as fuel vapors) enters the F8 fuel leak valve assembly 9 through the N5 interface 15. This valve assembly, as the core unit for leak gas treatment, achieves strict control of the leaked gas through a dual-shutdown emission structure, preventing the leaked gas from spreading and causing safety accidents. After being controlled by the valve assembly, the leaked gas is divided into two paths: One path merges with the output branch of F7 cold water return valve group 8 and enters the exhaust gas recovery system through interface N14; the other path merges with the output branch of F6 fuel return valve group 7 and enters the exhaust gas treatment system through interface N9, realizing "dual path treatment" of leaked gas to ensure that there is no leaked gas residue or overflow. The traditional welded valve assembly is replaced by a pneumatic double shut-off (DBB) valve assembly. A single valve assembly integrates multi-path control functions, reducing space occupation by 50% compared to traditional three-way valve assemblies with multiple single valves. Simultaneously, the double shut-off structure of the DBB valve assembly significantly reduces the number of welding points, fundamentally reducing the probability of leakage, and is particularly suitable for the safe transportation requirements of flammable, explosive, and toxic fuels such as LNG and liquid ammonia. Full-process safety redundancy: Each functional branch (such as nitrogen purging, cold water cleaning, and leak gas treatment) is designed with a redundant structure of "dual output + exhaust gas treatment," ensuring that the system can still function through the backup path in the event of a single pipeline or valve assembly failure, avoiding downtime or safety accidents. Through fuel recovery (N7 interface 17), cold water circulation (N15 interface 25), and centralized exhaust gas treatment (N9 interface 19, N11 interface 21, N12 interface 22, N13 interface 23, N14 interface 24), the recycling of fuel and water resources and the centralized treatment of harmful gases are achieved, complying with ship environmental emission standards and reducing the impact of carbon emissions on the marine environment.

[0016] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A skid-mounted device for a marine engine fuel supply control valve assembly, characterized in that, The equipment includes a skid-mounted main body (1), which includes an F1 fuel supply valve group (2), an F2 high-pressure nitrogen valve group (3), an F3 low-pressure nitrogen valve group (4), an F4 purge nitrogen valve group (5), an F5 cold water inlet valve group (6), and an E1 electric heater (10). The skid-mounted main body (1) has an N1 interface (11) connected to the feed end of the F1 fuel supply valve group (2) on its outer side. The outer peripheral fuel outlet of the F1 fuel supply valve group (2) is connected to the engine feed end via an N2 interface (12). The outer peripheral exhaust end of the F1 fuel supply valve group (2) has an N13 interface (23) located on the outer side of the skid-mounted main body (1), and the N13 interface (23) is connected to the exhaust gas treatment system. The F2 high-pressure nitrogen valve group (3) and the F3 low-pressure nitrogen valve group (4) are also connected to the exhaust gas treatment system. 4) Two sets of outlets are provided on the outer perimeter. One set of outlets of F2 high-pressure nitrogen valve group (3) and one set of outlets of F3 low-pressure nitrogen valve group (4) are connected to the inlet of F1 fuel supply valve group (2) through conduits. The other set of outlets of F2 high-pressure nitrogen valve group (3) are connected to the other set of outlets of F3 low-pressure nitrogen valve group (4) through conduits and are connected to the inlet of E1 electric heater (10). The outlet of E1 electric heater (10) is connected to the inlet of F4 purge nitrogen valve group (5) through conduits. Two sets of outlets are provided on the outer perimeter of F4 purge nitrogen valve group (5). One set of outlets of F4 purge nitrogen valve group (5) is connected to the fuel outlet main pipe of F1 fuel supply valve group (2). The other set of outlets of F4 purge nitrogen valve group (5) is connected to the tail gas recovery system through N12 interface (22). The skid-mounted equipment body (1) is provided with an N10 interface (20) on its outer periphery that is connected to the inlet end of the F5 cold water inlet valve group (6). The F5 cold water inlet valve group (6) has two outlets on its outer periphery. One outlet of the F5 cold water inlet valve group (6) is connected to the fuel outlet main pipe of the F1 fuel supply valve group (2), and the other outlet of the F5 cold water inlet valve group (6) is connected to the air inlet end of the exhaust gas recovery system through the N11 interface (21).

2. The skid-mounted equipment for a marine engine fuel supply control valve assembly according to claim 1, characterized in that, The skid-mounted equipment body (1) also includes an F6 fuel return valve assembly (7), an F7 cold water return valve assembly (8), and an F8 fuel leak valve assembly (9). The skid-mounted equipment body (1) has an N8 interface (18) on its outer side for guiding engine return fuel flow. The N8 interface (18) has two outlets on its inner side. One outlet of the N8 interface (18) is connected to the F6 fuel return valve assembly (7) via a conduit, and the other outlet of the N8 interface (18) is connected to the F7 cold water return valve assembly (8) via a conduit. The outer peripheral outlets of the F6 fuel return valve assembly (7), the F7 cold water return valve assembly (8), and the F8 fuel leak valve assembly (9) are all connected to the F6 fuel return valve assembly (7). 9) Two sets of outlets are provided on the outer perimeter. One set of outlets of the F6 fuel return valve group (7) is connected to the fuel recovery tank through the N7 interface (17). The other set of outlets of the F6 fuel return valve group (7) is connected to one set of outlets of the F8 fuel leakage valve group (9) through a conduit and is connected to the exhaust gas recovery system through the N9 interface (19). One set of outlets of the F7 cold water return valve group (8) is connected to the other set of outlets of the F8 fuel leakage valve group (9) through a conduit and is connected to the exhaust gas recovery system through the N14 interface (24). The other set of outlets of the F7 cold water return valve group (8) is connected to the cold water system through the N15 interface (25).

3. The skid-mounted equipment for a marine engine fuel supply control valve assembly according to claim 2, characterized in that, The skid-mounted equipment body (1) is provided with an N5 interface (15) for guiding the leakage gas of the drilling machine on its outer periphery, and the N5 interface (15) is connected to the F8 fuel leakage valve group (9) through a conduit.

4. The skid-mounted equipment for a marine engine fuel supply control valve assembly according to claim 1, characterized in that, The skid-mounted equipment body (1) is provided with N3 interface (13) and N4 interface (14) for guiding flow on its outer periphery. The N3 interface (13) has two sets of outlets on its inner side. One set of outlets of the N3 interface (13) is connected to the outlet of the F6 fuel return valve group (7) through a conduit, and the other set of outlets of the N3 interface (13) is connected to the F2 high-pressure nitrogen valve group (3) through a conduit. The N4 interface (14) is connected to the F3 low-pressure nitrogen valve group (4) through a conduit.

5. A skid-mounted device for a marine engine fuel supply control valve assembly according to claim 1, characterized in that, The skid-mounted equipment body (1) has an N16 interface (26) for purging on one side of its outer perimeter, and an N6 interface (16) connected to the N18 interface (28) on one side of its outer perimeter. The end of the N6 interface (16) away from the N18 interface (28) is connected to the exhaust gas treatment system through a conduit.

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