A device for preventing the main engine of an LNG-powered ship from being flooded

Abstract

The utility model discloses a device for preventing the water from flowing into the main engine of LNG power ship, which comprises an exhaust main pipe and an exhaust branch pipe, one end of the exhaust branch pipe is connected with the exhaust port of the main engine of LNG power ship, the other end is connected with the exhaust main pipe, the exhaust main pipe is provided with a vertical lowest point and a horizontal lowest point, a water tank and two water seals are further included, one end of the two water seals is connected with the water tank, the other end of one of the water seals is connected with the vertical lowest point of the exhaust main pipe, and the other end of the other water seal is connected with the horizontal lowest point of the exhaust main pipe. The utility model has the characteristics of effectively preventing the water in the exhaust main pipe from flowing back into the main engine of the ship.

Description

Technical Field

[0001] This utility model belongs to the field of gas engine water ingress prevention technology, specifically relating to a device for preventing water ingress into the main engine of an LNG-powered ship. Background Technology

[0002] When the gas engines of LNG-powered ships are operating, the combustion of natural gas produces a large amount of water vapor, as shown in the following formula: When the engine is running at high speed, water vapor will be discharged along with the exhaust gas. However, when running at low speed, water vapor will adhere to the inner wall of the exhaust pipe and flow down the wall of the main exhaust pipe. This can easily cause water generated in the main exhaust pipe to flow back into the ship's main engine, causing damage to the main engine. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a device for preventing water from entering the main engine of LNG-powered ships.

[0004] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted:

[0005] A device for preventing water from entering the main engine of an LNG-powered ship includes an exhaust main pipe and an exhaust branch pipe. One end of the exhaust branch pipe is connected to the exhaust port of the LNG-powered ship's main engine, and the other end is connected to the exhaust main pipe. The exhaust main pipe has a vertical lowest point and a horizontal lowest point. The device also includes a water tank and two water seals. One end of each water seal is connected to the water tank. The other end of one water seal is connected to the vertical lowest point of the exhaust main pipe, and the other end of the other water seal is connected to the horizontal lowest point of the exhaust main pipe.

[0006] Furthermore, the water seal includes a water supply pipe; a funnel; and a water trap, one end of which is connected to the water tank via a water supply pipe, and the other end of which is connected to the funnel via another water supply pipe.

[0007] Furthermore, the device for preventing water from entering the main engine of an LNG-powered ship according to this utility model also includes a water pump, one end of which is connected to a water tank via a water pumping pipe, and the other end is connected to a water delivery pipe.

[0008] Furthermore, the present invention provides a device for preventing water from entering the main engine of an LNG-powered ship, comprising a first control valve, a second control valve, and a fifth control valve. The first control valve and the fifth control valve are sequentially installed on the water pump from the water tank to the water pump, and the second control valve is installed on the water delivery pipe.

[0009] Furthermore, the device for preventing water from entering the main engine of an LNG-powered ship according to this utility model also includes a high-level probe, a low-level probe, and a controller. The high-level probe is installed near the top of the water tank, and the low-level probe is installed near the bottom of the water tank. The high-level probe, the low-level probe, the water pump, and the controller are electrically connected.

[0010] Furthermore, the device for preventing water ingress into the main engine of an LNG-powered ship according to this utility model also includes a combustible gas probe, a second gas pipe, a second electric fireproof damper, an exhaust fan, a second vent cap with a fireproof mesh, a first vent cap with a fireproof mesh, a first gas pipe, and a first electric fireproof damper. The combustible gas probe is installed in the water tank. One end of the second gas pipe is provided with a second vent cap with a fireproof mesh, and the other end is connected to the top of the water tank. An exhaust fan and a second electric fireproof damper are also installed on the second gas pipe. One end of the first gas pipe is provided with a first vent cap with a fireproof mesh, and the other end is connected to the top of the water tank. A first electric fireproof damper is also installed on the first gas pipe. The exhaust fan, the second vent cap with a fireproof mesh, the first vent cap with a fireproof mesh, and the combustible gas probe are all electrically connected to the controller.

[0011] Furthermore, the device for preventing water from entering the main engine of an LNG-powered ship according to this utility model also includes a temperature sensor, which is installed on the top of the water tank and electrically connected to the controller.

[0012] Furthermore, the exhaust branch pipe is inserted into the exhaust main pipe, and the distance L between the port of the exhaust branch pipe and the inner side of the exhaust main pipe is 20-40mm.

[0013] Furthermore, the device for preventing water from entering the main engine of an LNG-powered ship according to this utility model also includes a sealing component, and the outlet end of the exhaust pipe is equipped with a sealing component.

[0014] Furthermore, the sealing component includes a cover plate, a torsion spring, and a base. The end face of the outlet end of the exhaust pipe is inclined downwards. The base is installed at the high end of the outlet end. One end of the cover plate is hinged to the base, and the cover plate and the base are also connected by a torsion spring. The torsion spring presses the cover plate to fasten it to the outlet end.

[0015] The advancements of this invention compared to the prior art are as follows:

[0016] 1. This utility model can collect water generated in the exhaust pipe, preventing water from entering the ship's main engine. The lowest vertical point of the exhaust pipe is connected to a water seal, and the lowest horizontal point of the exhaust pipe is connected to another water seal. The two water seals guide the water generated in the exhaust pipe to a water tank for storage, and the water seals can prevent flue gas from entering the water tank.

[0017] 2. In this utility model, the exhaust branch pipe is inserted into the exhaust vertical main pipe, and the end face of the exhaust branch pipe inside the exhaust vertical main pipe is 20-40mm away from the inner side of the exhaust vertical main pipe, so that the end face of the exhaust branch pipe protrudes from the inner side of the exhaust vertical main pipe, which can prevent water from the inner side of the exhaust vertical main pipe from entering the port of the exhaust branch pipe. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the structure of a device for preventing water from entering the main engine of an LNG-powered ship, which is installed in the exhaust pipe.

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of AA;

[0021] Figure 3 This is a schematic diagram of the structure of the water tank in this utility model, which is connected to the exhaust pipe via a pipeline;

[0022] Figure 4 This is a schematic diagram of a connection structure in which the exhaust branch pipe is inserted into the exhaust main pipe in this utility model; in the figure, L is the distance between the end face of the exhaust branch pipe and the inner side of the exhaust main pipe.

[0023] The names and serial numbers of each component in the diagram are as follows:

[0024] 1-Water tank, 2-High liquid level probe, 3-Liquid level gauge, 4-Combustible gas probe, 5-Pumping pipe, 6-First control valve, 7-Pumping pump, 8-Water delivery pipe, 9-Second control valve, 10-First inlet pipe, 11-First trap, 12-First delivery pipe, 13-Third control valve, 14-Second inlet pipe, 15-Second trap, 16-Second delivery pipe, 17-Fourth control valve, 18-Second funnel, 19-Exhaust valve Pipe, 20-Vertical exhaust main pipe, 21-Horizontal exhaust main pipe, 22-Cover plate, 23-Base, 24-First funnel, 25-Controller, 26-Low liquid level probe, 27-Temperature sensor, 28-First air pipe, 29-First electric fireproof damper, 30-First vent cap with fireproof mesh, 31-Second electric fireproof damper, 32-Second air pipe, 33-Exhaust fan, 34-Second vent cap with fireproof mesh, 35-Fifth control valve. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments in this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0026] Example 1:

[0027] like Figures 1 to 4 As shown, this disclosure discloses a device for preventing water from entering the main engine of an LNG-powered ship. It can be applied to prevent water from entering the main engine through the exhaust pipe. The device includes a main exhaust pipe, an exhaust branch pipe, a water tank 1, and two water seals. One end of the exhaust branch pipe is connected to the exhaust port of the LNG-powered ship's main engine, and the other end is connected to the main exhaust pipe. The main exhaust pipe has a vertical lowest point and a horizontal lowest point. One end of each of the two water seals is connected to the water tank 1. The other end of one water seal is connected to the vertical lowest point of the main exhaust pipe, and the other end of the other water seal is connected to the horizontal lowest point of the main exhaust pipe.

[0028] like Figure 1 As shown, the exhaust main includes a vertical exhaust main 20 and a horizontal exhaust main 21. The vertical exhaust main 20 is installed vertically, and the horizontal exhaust main 21 is installed horizontally. One end of the horizontal exhaust main 21 is connected to one end of the vertical exhaust main 20, and the other end extends overboard. The lowest horizontal point of the horizontal exhaust main 21 can be located near the connection between the horizontal exhaust main and the vertical exhaust main. The lowest vertical point of the vertical exhaust main 20 is located at the bottom end of the vertical exhaust main.

[0029] The water seal prevents flue gas from entering the water tank from the exhaust pipe.

[0030] It should be noted that drainage outlets are provided at both the lowest horizontal and vertical points.

[0031] Understandably, the installation height of the water tank can be lower than the height of its lowest vertical point.

[0032] In some embodiments of this disclosure, the water seal includes a water supply pipe, a funnel, and a water trap. One end of the water trap is connected to the water tank 1 via a water supply pipe, and the other end is connected to the funnel via another water supply pipe.

[0033] Specifically, for clarity, a water seal includes a first inlet pipe 10, a first water trap 11, a first water supply pipe 12, and a first funnel 24. One end of the first water trap 11 is connected to the water tank 1 via the first inlet pipe 10, and the other end is connected to one end of the first water supply pipe 12. The other end of the first water supply pipe 12 is connected to the first funnel 24, which is connected to the lowest horizontal point on the exhaust horizontal main pipe. When the first funnel 24 is installed, its top edge covers the drain outlet at the lowest horizontal point. The edge of the first funnel can be welded to the exhaust horizontal main pipe, thus sealing the drain outlet at the lowest horizontal point within the first funnel and preventing smoke leakage from the connection between the first funnel and the exhaust horizontal main pipe.

[0034] Similarly, another water seal component includes a second inlet pipe 14, a second water trap 15, a second water supply pipe 16, and a second funnel 18. One end of the second water trap 15 is connected to the water tank 1 via the second inlet pipe 14, and the other end is connected to the second funnel 18. The edge of the second funnel can be welded to the vertical exhaust pipe, so that the drain outlet at the lowest vertical point is sealed inside the second funnel, preventing smoke leakage from the connection between the second funnel and the vertical exhaust pipe.

[0035] Both the first water trap 11 and the second water trap 15 contain water, which can prevent flue gas from entering the water tank.

[0036] To facilitate control of the opening and closing of the water supply pipe, a third control valve 13 and a fourth control valve 17 are added. The third control valve 13 is installed on the first water supply pipe 12. When the third control valve 13 is open, the first water supply pipe is open, and the first water trap and the first funnel are connected. When the third control valve 13 is closed, the first water supply pipe is closed, the first water trap and the first funnel are blocked, and the water in the first funnel cannot be transported to the first water trap 11 through the first water supply pipe.

[0037] It should be noted that the installation positions of the first water trap 11 and the second water trap 15 are both higher than the water tank.

[0038] In some embodiments of this disclosure, a water pump 7 is added to facilitate the pumping of water out of the water tank. One end of the water pump 7 is connected to the water tank 1 through a water pumping pipe 5, and the other end is connected to a water supply pipe 8.

[0039] This embodiment also includes a first control valve 6, a second control valve 9, and a fifth control valve 35. The first control valve 6 and the fifth control valve 35 are sequentially installed on the pumping pipe 5 from the water tank 1 to the pump 7. The second control valve 9 is installed on the water supply pipe 8.

[0040] When it is necessary to repair the water pump 7, the first control valve 6 and the second control valve 9 can be closed to carry out the repair work on the water pump.

[0041] When the first control valve 6, the second control valve 9, and the fifth control valve 35 are open, the water pump 7 draws water from the water tank 1 through the water pumping pipe 5. After pumping is completed, closing the first control valve 6, the second control valve 9, and the fifth control valve 35 prevents water from the water tank from flowing into the water pump 7 through the water pumping pipe. The first control valve 6 can prevent water in the water supply pipe 8 from flowing back into the water pump 7.

[0042] It should be noted that the first control valve 6 and the second control valve 9 are normally open. The first control valve 6 and the second control valve 9 can be manual valves. The water tank 1 is located inside the engine room, and the outlet of the water supply pipe 8 that drains water overboard is located on the outer plate, close to the main deck, and its height is much higher than that of the water tank.

[0043] In some embodiments of this disclosure, a high-level probe 2, a low-level probe 26, and a controller 25 are added to control the water level in the water tank. The high-level probe 2 is installed near the top of the water tank 1, and the low-level probe 26 is installed near the bottom of the water tank 1. The high-level probe 2, the low-level probe 26, the water pump 7, and the controller 25 are electrically connected. The high-level probe 2 and the low-level probe 26 monitor the water level information in the water tank and transmit it to the controller 25 in real time.

[0044] To facilitate control of the fifth control valve 35, it can be an electrically operated shut-off valve and electrically connected to the controller 25. The controller 25 can control the operation of the fifth control valve, thereby controlling the opening and closing of the second control valve.

[0045] Work style:

[0046] The first control valve 6 and the second control valve 9 are normally open. When the water level in the tank rises to the high level probe 2, the high level probe 2 is triggered and sends data information to the controller 25. Upon receiving this data information, the controller 25 controls the fifth control valve 35 to open and the water pump 7 to operate. The water pump 7 draws water from the tank 1 through the pumping pipe 5 and delivers it to the water supply pipe 8. The water supply pipe 8 then guides the water to the outer side for discharge. When the water level in the tank 1 drops and the water level falls to the trigger level set by the low level probe 26, the low level probe 26 immediately sends low level data information to the controller 25. Upon receiving this low level data information, the controller controls the water pump 7 to stop operating and the fifth control valve 35 to close.

[0047] In some embodiments of this disclosure, to detect the presence of combustible gas in the water tank, a combustible gas probe 4, a second gas pipe 32, a second electric fireproof damper 31, an exhaust fan 33, a second fireproof mesh vent cap 34, a first fireproof mesh vent cap 30, a first gas pipe 28, and a first electric fireproof damper 29 are added. The combustible gas probe 4 is installed in the water tank 1. One end of the second gas pipe 32 is provided with a second fireproof mesh vent cap 34, and the other end is connected to the top of the water tank 1. The exhaust fan 33 and the second electric fireproof damper 31 are also installed on the second gas pipe 32. One end of the first gas pipe 28 is provided with a first fireproof mesh vent cap 30, and the other end is connected to the top of the water tank 1. The first electric fireproof damper 29 is also installed on the first gas pipe 28. The exhaust fan 33, the second fireproof mesh vent cap 34, the first fireproof mesh vent cap 30, and the combustible gas probe 4 are all electrically connected to the controller 25.

[0048] The second fireproof and breathable cap 34 and the first fireproof and breathable cap 30 can be placed in open areas on the ship.

[0049] The second electric fireproof damper 31 and the first electric fireproof damper 29 are normally open.

[0050] Combustible gas probe 4 is installed in water tank 1 to monitor the combustible gas information in water tank 1 in real time and transmit the monitored data to controller 25 in real time. The upper and lower limits of combustible gas concentration can be preset on controller 25. For example, the upper limit of combustible gas concentration is 10%, and the lower limit is 0%. When the combustible gas probe 4 detects that the combustible gas concentration in the water tank reaches 10%, the controller 25 simultaneously activates the audible and visual alarm and starts the exhaust fan 33. The exhaust fan 33 draws gas from the water tank, and the drawn gas enters the exhaust fan 33 through the second gas pipe 32 and the second electric fireproof damper 31. The exhaust fan 33 then guides the gas through another second gas pipe 32 to the second fireproof mesh vent cap 34, which discharges the gas outward. At the same time, outside air enters the first gas pipe 28 through the first fireproof mesh vent cap 30, and the first gas pipe 28 guides the outside air through the first electric fireproof damper 29 into the water tank 1. The influx of outside air prevents the gas pressure in the water tank from becoming too low. When the combustible gas probe 4 detects that the lower limit of combustible gas concentration in the water tank is 0%, the controller 25 stops the exhaust fan 33.

[0051] Understandably, the combustible gas probe has a built-in display screen that shows the concentration of combustible gas detected by the probe. This makes it easy to know whether there is combustible gas in the water tank, preventing unburned gas from the exhaust pipe from entering the water tank and accumulating there.

[0052] In some embodiments of this disclosure, a temperature sensor 27 is added to monitor the temperature inside the water tank. The temperature sensor 27 is mounted on the top of the water tank 1 and is electrically connected to the controller 5.

[0053] The controller 5 allows setting the upper and lower limits of the water tank temperature. For example, the upper limit can be set to 100℃ and the lower limit can be set to 30℃.

[0054] When a flood occurs in the water tank, the temperature inside the tank rises. When temperature sensor 27 detects that the temperature inside the tank has reached the upper limit, controller 5 controls the second electric fireproof damper 31 and the first electric fireproof damper 29 to close. This prevents outside air from entering the water tank. When the oxygen in the water tank is depleted, the fire is extinguished. When temperature sensor 27 detects that the temperature inside the water tank has reached the lower limit, controller 5 controls the second electric fireproof damper 31 and the first electric fireproof damper 29 to open.

[0055] In some embodiments of this disclosure, a level gauge 3 is added to facilitate on-site visual monitoring of the water level in the water tank 1. The level gauge 3 monitors the water level in the water tank 1 in real time. Workers can quickly obtain the water level information by checking the level gauge.

[0056] In some embodiments of this disclosure, to prevent water in the main exhaust pipe from entering the branch exhaust pipe through the connection port, such as... Figure 1 , 4 As shown, the exhaust branch pipe 19 is inserted into the exhaust vertical main pipe 20, and the distance L between the port of the exhaust branch pipe 19 and the inner side of the exhaust vertical main pipe 20 can be 20-40 mm. For example, one distance L between the port of the exhaust branch pipe 19 and the inner side of the exhaust vertical main pipe 20 can be 20 mm. Another distance L between the port of the exhaust branch pipe 19 and the inner side of the exhaust vertical main pipe 20 can be 30 mm. Yet another distance L between the port of the exhaust branch pipe 19 and the inner side of the exhaust vertical main pipe 20 can be 40 mm.

[0057] Understandably, when the exhaust branch pipe is inserted into the vertical exhaust main pipe, the port of the exhaust branch pipe protrudes from the side of the vertical exhaust main pipe, preventing water from flowing into the exhaust branch pipe as it passes through the port of the exhaust branch pipe. However, when the port of the existing exhaust branch pipe is flush with the inner side of the vertical exhaust main pipe, water from the vertical exhaust main pipe flows into the exhaust branch pipe as it passes through the port of the exhaust branch pipe, causing water to enter the main unit through the exhaust branch pipe. Therefore, this invention overcomes the defects in the existing exhaust branch pipe installation.

[0058] In some embodiments of this disclosure, a sealing element is added to prevent water from entering through the exhaust port of the exhaust pipe. For example... Figure 1As shown, a sealing element is installed at the outlet end of the exhaust pipe. When the main unit is operating, it supplies combustion-generated flue gas to the exhaust pipe. As the flue gas exits from the outlet end of the exhaust pipe, it pushes the sealing element open, allowing the flue gas to escape. When the main unit stops operating, there is no flue gas inside the exhaust pipe, and the sealing element, no longer pushed by the flue gas, resets and latches onto the outlet end of the exhaust pipe. The sealing element thus prevents water from entering the outlet end of the exhaust pipe, achieving a waterproof function.

[0059] In some embodiments of this disclosure, a structure for the sealing element is provided, such as... Figure 1 As shown, the sealing component includes a cover plate 22, a torsion spring (not shown in the figure), and a base 24. The end face of the outlet end of the exhaust pipe is inclined downward. The base 24 is installed at the high end of the outlet end. One end of the cover plate 22 is hinged to the base 24. At the same time, the cover plate 22 and the base 24 are also connected by a torsion spring. The torsion spring restricts the cover plate 22 to be fastened to the outlet end.

[0060] The cover plate 22 and the base 24 are connected by a hinge: the cover plate 22 and the base 24 are connected by a pivot.

[0061] Installation method of the torsion spring: The torsion spring is sleeved on the rotating shaft. The first torsion arm on the torsion spring is connected to the cover plate 22, and the second torsion arm is connected to the base 24. When flue gas is discharged from the exhaust pipe, the flue gas pushes the cover plate to swing, and at the same time, the torsion spring undergoes elastic deformation, the outlet end opens, and the flue gas is ejected outward. When no flue gas is discharged from the exhaust pipe, the torsion spring returns to its elastic deformation state, thereby pressing the cover plate to re-fasten onto the outlet end.

[0062] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A device for preventing water ingress into the main engine of an LNG-powered ship, comprising a main exhaust pipe and an exhaust branch pipe, one end of the exhaust branch pipe being connected to the exhaust port of the LNG-powered ship's main engine and the other end being connected to the main exhaust pipe, wherein the main exhaust pipe has a vertical lowest point and a horizontal lowest point; characterized in that: Also includes Water tank (1), and Two water seals, one end of each water seal is connected to the water tank (1), the other end of one water seal is connected to the lowest vertical point of the exhaust pipe, and the other end of the other water seal is connected to the lowest horizontal point of the exhaust pipe.

2. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 1, characterized in that: The water seal component includes a water supply pipe; Funnel; and A water trap, one end of which is connected to a water tank (1) via a water supply pipe, and the other end of which is connected to a funnel via another water supply pipe.

3. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 1, characterized in that: It also includes a water pump (7), one end of which is connected to the water tank (1) through a water pumping pipe (5), and the other end is connected to a water supply pipe (8).

4. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 3, characterized in that: It also includes a first control valve (6), a second control valve (9) and a fifth control valve (35). The first control valve (6) and the fifth control valve (35) are installed sequentially on the water pump (7) from the water tank (1) and the water delivery pipe (8). The second control valve (9) is installed on the water delivery pipe (8).

5. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 3, characterized in that: It also includes a high level probe (2), a low level probe (26) and a controller (25). The high level probe (2) is installed near the top of the water tank (1) and the low level probe (26) is installed near the bottom of the water tank (1). The high level probe (2), the low level probe (26), the water pump (7) and the controller (25) are electrically connected.

6. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 5, characterized in that: It also includes a combustible gas probe (4), a second gas pipe (32), a second electric fireproof damper (31), an exhaust fan (33), a second fireproof mesh vent cap (34), a first fireproof mesh vent cap (30), a first gas pipe (28), and a first electric fireproof damper (29). The combustible gas probe (4) is installed on the water tank (1). One end of the second gas pipe (32) is provided with a second fireproof mesh vent cap (34), and the other end is connected to the top of the water tank (1). An exhaust fan (33) and a second electric fireproof damper (31) are also installed on the second gas pipe (32). One end of the first gas pipe (28) is provided with a first fireproof mesh vent cap (30), and the other end is connected to the top of the water tank (1). A first electric fireproof damper (29) is also installed on the first gas pipe (28). The exhaust fan (33), the second fireproof mesh vent cap (34), the first fireproof mesh vent cap (30), and the combustible gas probe (4) are all electrically connected to the controller (25).

7. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 5, characterized in that: It also includes a temperature sensor (27), which is mounted on the top of the water tank (1) and electrically connected to the controller (25).

8. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 1, characterized in that: The exhaust branch pipe is inserted into the exhaust main pipe, and the distance L between the port of the exhaust branch pipe and the inner side of the exhaust main pipe is 20-40mm.

9. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 1, characterized in that: It also includes a sealing element, which is installed at the outlet end of the exhaust pipe.

10. The device for preventing water ingress into the main engine of an LNG-powered ship according to claim 9, characterized in that: The sealing component includes a cover plate (22), a torsion spring, and a base (24). The end face of the outlet end of the exhaust pipe is inclined downward. The base (24) is installed at the high end of the outlet end. One end of the cover plate (22) is hinged to the base (24). The cover plate (22) and the base (24) are also connected by a torsion spring. The torsion spring presses the cover plate (22) to cover the outlet end.

Images