Exhaust system and ship

Abstract

The invention belongs to the technical field of ships, and discloses an exhaust system and a ship. In the exhaust system, an exhaust pipe is used for being connected with an engine and exhausting tail gas of the engine; the ammonia gas pressure tank is provided with an ammonia gas inlet end and an ammonia gas outlet end, the ammonia gas inlet end is used for being connected with the ammonia fuel tank and enabling ammonia gas in the ammonia fuel tank to enter the ammonia gas pressure tank, and the ammonia gas outlet end is used for discharging the ammonia gas in the ammonia fuel tank, so that the pressure stabilizing effect can be achieved through the ammonia gas pressure tank; the ammonia gas injector provides certain buffer for ammonia gas provided by the ammonia fuel tank, is connected with the ammonia gas outlet end and is used for injecting the ammonia gas into the exhaust pipe, so that the ammonia gas is mixed with tail gas of the engine; the catalytic reduction device is arranged on the exhaust pipe and located on the downstream portion of the ammonia gas ejector so that the ammonia gas and the tail gas of the engine can be subjected to a catalytic reduction reaction, the content of nitric oxide in the tail gas can be reduced, and in addition, the ammonia gas injection amount of the ammonia gas ejector can be conveniently controlled through the arrangement of the ammonia gas pressure tank.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to an exhaust system and a ship. Background Art

[0002] In order to meet the Tier III requirements of the International Maritime Organization (IMO) for ship nitrogen oxide emissions, most ships currently use urea as a reducing agent. Urea solution decomposes to produce ammonia, which catalytically reduces nitrogen oxides in exhaust gas at 200°C. This system is mainly suitable for fuel-powered, LNG-powered and methanol-powered ships. The ship needs to be equipped with special urea storage tanks, discharge tanks, urea supply systems, metering systems and special pipelines. The ship layout is complex and the cost is high, which is not suitable for liquid ammonia-powered ships.

[0003] In this regard, the prior art provides a post-processing ammonia supply system, in which a liquid ammonia storage tank is connected to the dual-fuel nozzle of the ammonia diesel engine and the liquid ammonia nozzle in the post-processor at the same time, so that part of the ammonia is supplied to the ammonia diesel engine as fuel for combustion, and the other part is transported to the post-processor to participate in the catalytic reduction reaction to reduce the nitrogen oxide content in the engine exhaust. However, the problem is that the liquid ammonia storage tank is connected to the dual-fuel nozzle and the liquid ammonia nozzle at the same time, which makes it difficult to control the ammonia fuel injection amount in the ammonia diesel engine and the ammonia injection amount in the post-processor, and the two may affect each other. Summary of the invention

[0004] According to one aspect of the present invention, the present invention provides an exhaust system to solve the problem in the prior art that a liquid ammonia storage tank is simultaneously connected to a dual-fuel nozzle and a liquid ammonia nozzle, which makes it difficult to control the ammonia fuel injection amount in the ammonia diesel engine and the ammonia gas injection amount in the post-processor, and the two may affect each other.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] Exhaust system, including:

[0007] An exhaust pipe, used to be connected to the engine and to discharge the exhaust gas of the engine;

[0008] an ammonia pressure tank, having an ammonia inlet end and an ammonia outlet end, wherein the ammonia inlet end is used to connect to an ammonia fuel tank and allow the ammonia in the ammonia fuel tank to enter the ammonia pressure tank, and the ammonia outlet end is used to discharge the ammonia in the ammonia fuel tank;

[0009] an ammonia injector, connected to the ammonia outlet and used to inject ammonia into the exhaust pipe;

[0010] The catalytic reduction device is arranged in the exhaust pipe and is located downstream of the ammonia injector.

[0011] As a preferred solution for the exhaust system, the ammonia fuel tank is used to store liquid ammonia, the ammonia inlet end is connected to a first air intake pipeline and a second air intake pipeline, the first air intake pipeline and the second air intake pipeline are both connected to the ammonia fuel tank, the first air intake pipeline is provided with a liquid ammonia vaporizer, and the second air intake pipeline is provided with an ammonia booster device.

[0012] As a preferred solution for the exhaust system, the ammonia inlet end is also used to connect to an ammonia recovery cabinet for releasing ammonia.

[0013] As a preferred solution of the exhaust system, the ammonia outlet end is connected to the ammonia injector via an outlet pipeline, and the outlet pipeline is provided with an ammonia flow control valve.

[0014] As a preferred solution of the exhaust system, an ammonia concentration sensor is provided downstream of the catalytic reduction device, and the ammonia concentration sensor is used to detect the ammonia concentration downstream of the catalytic reduction device.

[0015] As a preferred solution of the exhaust system, the ammonia outlet port and the ammonia injector are connected via an outlet pipe, and the outlet pipe includes a first pipe section connected to the ammonia outlet port and a second pipe section connected to the ammonia injector, the first pipe section is located outside the ship's engine room area, the second pipe section is located inside the ship's engine room area, and the second pipe section is a double-layer pipe.

[0016] As a preferred solution of the exhaust system, it also includes an explosion-discharging pipe connected to the exhaust pipe, and the explosion-discharging pipe is connected downstream of the catalytic reduction device.

[0017] According to another aspect of the present invention, a ship is provided, comprising the above-mentioned exhaust system, and also comprising an engine and an ammonia fuel tank, wherein the engine is the ship's main engine, the exhaust pipe is connected to the engine and is used to discharge the exhaust gas of the engine, and the ammonia inlet end of the ammonia pressure tank is connected to the ammonia fuel tank and is used for the ammonia in the ammonia fuel tank to enter the ammonia pressure tank.

[0018] As a preferred solution for the ship, the engine is an ammonia fuel main engine, and the air intake pipe of the engine is connected to an ammonia fuel tank.

[0019] As a preferred solution for the ship, a water curtain protection system is also included, and the water curtain protection system is used to connect to a fresh water source and to spray fresh water into the engine room area of ​​the ship.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides an exhaust system, comprising an exhaust pipe, an ammonia pressure tank, an ammonia injector and a catalytic reduction device. The exhaust pipe is used to connect to an engine and to discharge the exhaust gas of the engine. The ammonia pressure tank has an ammonia inlet end and an ammonia outlet end. The ammonia inlet end is used to connect to an ammonia fuel tank and to allow the ammonia in the ammonia fuel tank to enter the ammonia pressure tank. The ammonia outlet end is used to discharge the ammonia in the ammonia fuel tank, so that the ammonia pressure tank can achieve a pressure stabilization effect, providing a certain buffer for the ammonia provided by the ammonia fuel tank. The ammonia injector is connected to the ammonia outlet end and is used to inject ammonia into the exhaust pipe so that the ammonia is mixed with the exhaust gas of the engine. The catalytic reduction device is arranged in the exhaust pipe and is located downstream of the ammonia injector so that the ammonia and the exhaust gas of the engine can undergo a catalytic reduction reaction to reduce the nitrogen oxide content in the exhaust gas. In addition, by arranging the ammonia pressure tank, a pressure stabilization effect can be achieved, which is convenient for controlling the ammonia injection amount of the ammonia injector.

[0022] The present invention also provides a ship, including the above-mentioned exhaust system, and also including an engine and an ammonia fuel tank, the engine is the ship's main engine, the exhaust pipe is connected to the engine, and is used to discharge the engine's exhaust gas, the ammonia inlet end of the ammonia pressure tank is connected to the ammonia fuel tank, and is used for the ammonia in the ammonia fuel tank to enter the ammonia pressure tank. In the exhaust system, the ammonia injector is used to inject ammonia into the exhaust pipe so that the ammonia is mixed with the engine's exhaust gas, and the ammonia and the engine's exhaust gas can undergo a catalytic reduction reaction in the catalytic reduction device to reduce the nitrogen oxide content in the exhaust gas. In addition, by providing the ammonia pressure tank, it can play a role in stabilizing pressure, which is convenient for controlling the ammonia injection amount of the ammonia injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an exhaust system in an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0025] In the figure:

[0026] 100, engine; 200, ammonia fuel tank; 300, ammonia recovery cabinet; 400, water curtain protection system; 410, spray pipeline; 411, water spray port; 420, ammonia detector;

[0027] 1. Exhaust pipe; 11. Nitrogen oxide concentration sensor; 12. Ammonia concentration sensor;

[0028] 2. Ammonia pressure tank; 21. Ammonia inlet; 22. Ammonia outlet;

[0029] 3. Ammonia injector; 31. Injection port; 32. Check device;

[0030] 4. Catalytic reduction device;

[0031] 51. first air intake pipeline; 511. liquid ammonia vaporizer; 512. supply pump; 52. second air intake pipeline; 521. ammonia booster device; 53. third air intake pipeline;

[0032] 6. gas outlet pipeline; 61. ammonia flow control valve; 62. first pipe section; 621. ammonia flow meter; 63. second pipe section;

[0033] 7. Explosion-disposal pipe. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] Most ships usually use urea as a reducing agent. Urea solution decomposes to produce ammonia, which catalytically reduces nitrogen oxides in exhaust gas at 200°C. However, the structure is complex and costly, and is not suitable for liquid ammonia powered ships. In this regard, the prior art provides a post-processing ammonia supply system, in which a liquid ammonia storage tank is simultaneously connected to the dual-fuel nozzle of the ammonia diesel engine and the liquid ammonia nozzle in the post-processor, so that part of the ammonia is supplied to the ammonia diesel engine as fuel for combustion, and the other part is transported to the post-processor to participate in the catalytic reduction reaction to reduce the nitrogen oxide content in the engine exhaust. However, the problem is that the liquid ammonia storage tank is simultaneously connected to the dual-fuel nozzle and the liquid ammonia nozzle, which makes it difficult to control the ammonia fuel injection amount in the ammonia diesel engine and the ammonia injection amount in the post-processor, and the two may affect each other.

[0039] In view of the above problems, this embodiment provides an exhaust system to solve the problem in the prior art that the liquid ammonia storage tank is connected to the dual-fuel nozzle and the liquid ammonia nozzle at the same time, which makes it difficult to control the ammonia fuel injection amount in the ammonia diesel engine and the ammonia gas injection amount in the post-processor, and the two may affect each other. The system can be used in the field of ship technology, specifically in liquid ammonia fuel ships.

[0040] Reference Figure 1-Figure 2 The exhaust system includes an exhaust pipe 1, an ammonia pressure tank 2, an ammonia injector 3 and a catalytic reduction device 4. The exhaust pipe 1 is used to connect to the engine 100 and to discharge the exhaust gas of the engine 100; the ammonia pressure tank 2 has an ammonia inlet end 21 and an ammonia outlet end 22. The ammonia inlet end 21 is used to connect to the ammonia fuel tank 200 and is used for the ammonia in the ammonia fuel tank 200 to enter the ammonia pressure tank 2, and the ammonia outlet end 22 is used to discharge the ammonia in the ammonia fuel tank 200, so that the ammonia pressure tank 2 can play a stabilizing effect. The ammonia provided by the ammonia fuel tank 200 provides a certain buffer. The ammonia injector 3 is connected to the ammonia outlet port 22 and is used to inject ammonia into the exhaust pipe 1 so that the ammonia is mixed with the exhaust gas of the engine 100; the catalytic reduction device 4 is arranged in the exhaust pipe 1 and is located downstream of the ammonia injector 3 so that the ammonia and the exhaust gas of the engine 100 can undergo a catalytic reduction reaction to reduce the nitrogen oxide content in the exhaust gas. In addition, by setting up the ammonia pressure tank 2, it can play a role in stabilizing the pressure, which is convenient for controlling the ammonia injection amount of the ammonia injector 3.

[0041] Optionally, a nitrogen oxide concentration sensor 11 is provided at the end of the exhaust pipe 1. The nitrogen oxide concentration sensor 11 is used to detect the nitrogen oxide concentration in the exhaust gas at the end of the exhaust pipe 1, and can provide data for pollutant monitoring and control of the ship.

[0042] Continue to refer to Figure 1-Figure 2The ammonia fuel tank 200 is used to store liquid ammonia. The ammonia inlet end 21 is connected to a first air intake pipeline 51 and a second air intake pipeline 52. The first air intake pipeline 51 and the second air intake pipeline 52 are both connected to the ammonia fuel tank 200. The first air intake pipeline 51 is provided with a liquid ammonia vaporizer 511, so that the liquid ammonia stored inside the ammonia fuel tank 200 can be vaporized into ammonia gas through the liquid ammonia vaporizer 511 and enter the ammonia pressure tank 2, wherein one end of the first air intake pipeline 51 away from the ammonia inlet end 21 extends below the liquid ammonia level of the ammonia fuel tank 200, and the first air intake pipeline 51 is provided with a supply pump 512, and the supply pump 512 is used to allow the liquid ammonia in the ammonia fuel tank 200 to enter the liquid ammonia vaporizer 511. If only the first air intake pipeline 51 is set, it may cause insufficient air pressure inside the ammonia pressure tank 2, and further cause insufficient injection amount of the ammonia injector 3. Therefore, the second air intake pipeline 52 is provided with an ammonia booster device 521, wherein the end of the second air intake pipeline 52 away from the ammonia inlet end 21 is located above the liquid ammonia level of the ammonia fuel tank 200 and is used for ammonia to enter. Part of the ammonia located above the liquid ammonia level of the ammonia fuel tank 200 can enter the ammonia pressure tank 2 after being pressurized by the ammonia booster device 521.

[0043] Continue to refer to Figure 1-Figure 2 The ammonia inlet end 21 is also used to connect to the ammonia recovery cabinet 300, specifically, the ammonia inlet end 21 is also connected to the third air inlet pipeline 53, and the third air inlet pipeline 53 is connected to the ammonia recovery cabinet 300, and is used to release the ammonia inside the ammonia recovery cabinet 300 into the ammonia inlet end 21. For a liquid ammonia fuel ship, the engine 100 is an ammonia fuel main engine. When the ammonia fuel tank 200 provides liquid ammonia to the engine 100, part of the liquid ammonia will be vaporized into ammonia, and the ammonia will not enter the engine 100, but will be collected by the ammonia recovery cabinet 300, and this part of the ammonia can enter the ammonia pressure tank 2 through the third air inlet pipeline 53 and the ammonia inlet end 21.

[0044] Continue to refer to Figure 1-Figure 2 The ammonia outlet port 22 is connected to the ammonia injector 3 via an outlet pipeline 6, and the outlet pipeline 6 is provided with an ammonia flow control valve 61. In this embodiment, the opening of the ammonia flow control valve 61 is adjustable, so as to facilitate the control of the ammonia injection amount of the ammonia injector 3.

[0045] Optionally, an ammonia concentration sensor 12 is also provided downstream of the catalytic reduction device 4. The ammonia concentration sensor 12 is used to detect the ammonia concentration downstream of the catalytic reduction device 4. The opening of the ammonia flow control valve 61 can be adjusted based on the above ammonia concentration, thereby controlling the ammonia injection amount of the ammonia injector 3.

[0046] Continue to refer to Figure 1-Figure 2The ammonia outlet 22 is connected to the ammonia injector 3 through an outlet pipe 6, and the outlet pipe 6 includes a first pipe section 62 connected to the ammonia outlet 22 and a second pipe section 63 connected to the ammonia injector 3. The first pipe section 62 is located outside the ship's engine room area, and the second pipe section 63 is located in the ship's engine room area. The second pipe section 63 is a double-layer pipe, so as to avoid ammonia leakage in the second pipe section 63 located in the ship's engine room area. Among them, the ammonia flow control valve 61 is set in the first pipe section 62. In addition, the first pipe section 62 is also provided with an ammonia flow meter 621, and the ammonia flow meter 621 is used to detect the flow of ammonia.

[0047] Continue to refer to Figure 1-Figure 2 The ammonia injector 3 has a plurality of injection ports 31 located in the inner cavity of the exhaust pipe 1, so as to improve the uniformity of ammonia injection as much as possible. Optionally, the ammonia injector 3 is also provided with a check device 32, which is used to prevent ammonia from flowing back from the exhaust pipe 1 to the exhaust pipe 6. In this embodiment, the check device 32 is a one-way valve.

[0048] Continue to refer to Figure 1-Figure 2 The exhaust system further includes an explosion-discharging pipe 7 connected to the exhaust pipe 1, and the explosion-discharging pipe 7 is connected to the downstream of the catalytic reduction device 4. The explosion-discharging pipe 7 is used to discharge ammonia from the exhaust pipe 1 when the ammonia concentration in the exhaust pipe 1 is too high, so as to prevent the ammonia in the exhaust pipe 1 from deflagration and damage the exhaust system and the engine 100. Optionally, the ammonia concentration sensor 12 is used to detect the ammonia concentration downstream of the catalytic reduction device 4, and whether the explosion-discharging pipe 7 needs to be opened can be determined based on the above ammonia concentration.

[0049] The present embodiment also provides a ship, including the above-mentioned exhaust system, and also including an engine 100 and an ammonia fuel tank 200. The engine 100 is the main engine of the ship. The exhaust pipe 1 is connected to the engine 100 and is used to discharge the exhaust gas of the engine 100. The ammonia inlet end 21 of the ammonia pressure tank 2 is connected to the ammonia fuel tank 200 and is used for the ammonia in the ammonia fuel tank 200 to enter the ammonia pressure tank 2. In the exhaust system, the ammonia injector 3 is used to inject ammonia into the exhaust pipe 1 so that the ammonia is mixed with the exhaust gas of the engine 100. The ammonia and the exhaust gas of the engine 100 can be catalytically reduced in the catalytic reduction device 4 to reduce the nitrogen oxide content in the exhaust gas. In addition, by providing the ammonia pressure tank 2, it can play a role in stabilizing the pressure, which is convenient for controlling the ammonia injection amount of the ammonia injector 3.

[0050] Continue to refer to Figure 1The engine 100 is an ammonia fuel main engine, and the intake pipe of the engine 100 is connected to the ammonia fuel tank 200, so that the ammonia fuel tank 200 can provide liquid ammonia to the engine 100 and provide ammonia to the ammonia pressure tank 2 at the same time. Since the ammonia pressure tank 2 can play a stabilizing effect, it provides a certain buffer for the ammonia provided by the ammonia fuel tank 200. While facilitating the control of the ammonia injection amount of the ammonia injector 3, it can also avoid the mutual influence between the ammonia fuel tank 200 and the ammonia pressure tank 2 when the ammonia fuel tank 200 provides liquid ammonia to the engine 100 and provides ammonia to the ammonia pressure tank 2. In addition, since part of the liquid ammonia will be vaporized into ammonia when the ammonia fuel tank 200 provides liquid ammonia to the engine 100, the ammonia will not enter the engine 100, but will be collected by releasing the ammonia recovery cabinet 300, and this part of the ammonia can enter the ammonia pressure tank 2 through the ammonia inlet end 21.

[0051] Continue to refer to Figure 1 The ship also includes a water curtain protection system 400, which is used to connect to a fresh water source and spray fresh water to the ship's engine room area, so that when ammonia leaks in the ship's engine room area, fresh water is sprayed to dissolve the ammonia and ensure the safety of the ship's engine room area. Optionally, the water curtain protection system 400 specifically includes a spraying pipeline 410, one end of which is connected to a fresh water source, specifically connected to a ship's fresh water tank or a fresh water supply pipeline, and the other end of the spraying pipeline 410 is provided with a plurality of water spraying ports 411, which are used to spray fresh water to the ship's engine room area. Optionally, the water curtain protection system 400 also includes an ammonia detector 420 provided in the ship's engine room area, which is used to detect the ammonia concentration in the ship's engine room area, and can determine whether an ammonia leak occurs through a controller.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Exhaust system, characterized in that, include: An exhaust pipe (1), used for connecting to an engine (100) and for discharging exhaust gas from the engine (100); An ammonia pressure tank (2) having an ammonia inlet end (21) and an ammonia outlet end (22), wherein the ammonia inlet end (21) is used to connect to an ammonia fuel tank (200) and allow ammonia in the ammonia fuel tank (200) to enter the ammonia pressure tank (2), and the ammonia outlet end (22) is used to discharge ammonia in the ammonia fuel tank (200); an ammonia injector (3), connected to the ammonia outlet end (22) and used for injecting ammonia into the interior of the exhaust pipe (1); The catalytic reduction device (4) is arranged in the exhaust pipe (1) and is located downstream of the ammonia injector (3).

2. The exhaust system according to claim 1, characterized in that The ammonia fuel tank (200) is used to store liquid ammonia, the ammonia inlet end (21) is connected to a first air intake pipeline (51) and a second air intake pipeline (52), the first air intake pipeline (51) and the second air intake pipeline (52) are both connected to the ammonia fuel tank (200), the first air intake pipeline (51) is provided with a liquid ammonia vaporizer (511), and the second air intake pipeline (52) is provided with an ammonia booster device (521).

3. The exhaust system according to claim 1, characterized in that: The ammonia inlet end (21) is also used to connect to an ammonia recovery cabinet (300) for releasing ammonia.

4. The exhaust system according to any one of claims 1 to 3, characterized in that: The ammonia outlet end (22) is connected to the ammonia injector (3) via an outlet pipeline (6), and the outlet pipeline (6) is provided with an ammonia flow control valve (61).

5. The exhaust system according to any one of claims 1 to 3, characterized in that: An ammonia concentration sensor (12) is provided downstream of the catalytic reduction device (4), and the ammonia concentration sensor (12) is used to detect the ammonia concentration downstream of the catalytic reduction device (4).

6. The exhaust system according to any one of claims 1 to 3, characterized in that: The ammonia outlet end (22) is connected to the ammonia injector (3) via an outlet pipe (6), the outlet pipe (6) comprising a first pipe section (62) connected to the ammonia outlet end (22) and a second pipe section (63) connected to the ammonia injector (3), the first pipe section (62) being located outside the ship's engine room area, the second pipe section (63) being located inside the ship's engine room area, and the second pipe section (63) being a double-layer pipe.

7. The exhaust system according to any one of claims 1 to 3, characterized in that: It also includes an explosion-discharging pipe (7) connected to the exhaust pipe (1), wherein the explosion-discharging pipe (7) is connected downstream of the catalytic reduction device (4).

8. A vessel, characterized in that The invention comprises an exhaust system as claimed in any one of claims 1 to 7, and further comprises an engine (100) and an ammonia fuel tank (200), wherein the engine (100) is a main engine of a ship, the exhaust pipe (1) is connected to the engine (100) and is used to discharge the exhaust gas of the engine (100), and the ammonia inlet end (21) of the ammonia pressure tank (2) is connected to the ammonia fuel tank (200) and is used for the ammonia in the ammonia fuel tank (200) to enter the ammonia pressure tank (2).

9. The ship according to claim 8, characterized in that: The engine (100) is an ammonia fuel main engine, and an air intake pipe of the engine (100) is connected to an ammonia fuel tank (200).

10. The ship according to claim 8, characterized in that: Also included is a water curtain protection system (400), which is used to connect to a fresh water source and to spray fresh water into the ship's engine room area.

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