Marine ammonia gas treatment system and treatment method

Abstract

The invention belongs to the technical field of ships, and discloses a marine ammonia gas treatment system and a treatment method. The marine ammonia gas treatment system comprises an ammonia gas collecting tank, a first treatment tank, a second treatment tank, a third treatment tank and a waste liquid collecting tank, wherein the ammonia gas collecting tank is used for recycling ammonia gas generated by a marine ammonia fuel system; an outlet of the ammonia gas collecting tank is communicated with the first treatment tank; the first liquid discharge pipe is in heat exchange connection with the first heat exchanger; the exhaust port of the first treatment tank is communicated with the second treatment tank; the second liquid discharge pipe is in heat exchange connection with the second heat exchanger; an exhaust port of the second treatment tank is communicated with a third treatment tank, the top of the third treatment tank is communicated with a third water spraying pipe, and an acid solution flows in the third water spraying pipe; the first liquid discharge pipe is selectively communicated with the waste liquid collection tank and the first water spray pipe, and the second liquid discharge pipe is selectively communicated with the waste liquid collection tank and the second water spray pipe. The ammonia gas treatment system has the advantages of high absorption efficiency, low cost, safety and reliability, and ensures that the ammonia gas emission concentration meets the environmental protection standard.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a ship-based ammonia treatment system and treatment method. Background Art

[0002] With growing environmental awareness, the concept of green, zero-carbon shipping has been widely promoted in the marine sector. Ammonia is recognized by the marine industry as a potential energy source that emits no carbon particles when burned. It is currently one of the most promising alternative fuels for ships, and ammonia-fueled ships are attracting increasing attention from the industry.

[0003] Ammonia is known to be toxic, flammable, and corrosive. For environmental and personnel safety reasons, ammonia within ammonia-fueled power systems must be treated before being released into the atmosphere. Traditional ammonia treatment methods often suffer from low efficiency, high costs, and the potential for secondary pollution, failing to meet the shipping industry's stringent requirements for ammonia treatment.

[0004] Therefore, there is an urgent need to provide a new marine ammonia treatment system and treatment method to solve the above technical problems in the prior art. Summary of the Invention

[0005] The object of the present invention is to provide a marine ammonia treatment system with a simple structure, low maintenance and operating costs, and the advantages of high absorption efficiency, low cost, safety and reliability. It can reduce ammonia emissions and ensure that the ammonia emission concentration meets environmental protection standards.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The marine ammonia treatment system includes an ammonia collection tank, a first treatment tank, a second treatment tank, a third treatment tank and a waste liquid collection tank. The ammonia collection tank is used to recover ammonia generated by the ship's ammonia fuel system; the outlet of the ammonia collection tank is connected to the first treatment tank, the top of the first treatment tank is connected to a first water spray pipe, the first drain pipe at the bottom of the first treatment tank is connected to the first water spray pipe, the first drain pipe is connected to the first heat exchanger for heat exchange, and a cooling medium flows in the first heat exchanger; the exhaust port of the first treatment tank is connected to the second treatment tank, the top of the second treatment tank is connected to a second water spray pipe, and the second treatment tank is connected to the second water spray pipe. The second drain pipe at the bottom of the treatment tank is connected to the above-mentioned second water spray pipe, and the above-mentioned second drain pipe is connected to the second heat exchanger for heat exchange, and a cooling medium flows in the above-mentioned second heat exchanger; the exhaust port of the above-mentioned second treatment tank is connected to the above-mentioned third treatment tank, and the top of the above-mentioned third treatment tank is connected to the third water spray pipe, and an acidic solution flows in the above-mentioned third water spray pipe. The bottom of the above-mentioned third treatment tank is connected to the above-mentioned third water spray pipe, and the exhaust port of the above-mentioned third treatment tank is connected to the atmosphere; the above-mentioned first drain pipe is selectively connected to the above-mentioned waste liquid collection tank and the above-mentioned first water spray pipe, and the above-mentioned second drain pipe is selectively connected to the above-mentioned waste liquid collection tank and the above-mentioned second water spray pipe.

[0008] Optionally, a pressure regulating valve is provided at the outlet of the ammonia collection tank, and the pressure regulating valve is used to adjust the outlet pressure of the ammonia collection tank.

[0009] Optionally, a flow sensor is provided at the outlet of the ammonia collection tank.

[0010] Optionally, the second drainage pipe is connected to the top of the first treatment tank, and is connected to the waste liquid collection tank through the first drainage pipe.

[0011] Optionally, the outlet of the first drainage pipe is connected to a first branch pipe and a second branch pipe, the first branch pipe is connected to the first water spray pipe, and the second branch pipe is connected to the waste liquid collection tank; the outlet of the second drainage pipe is connected to a third branch pipe and a fourth branch pipe, the third branch pipe is connected to the second water spray pipe, and the fourth branch pipe is connected to the top of the first treatment tank; the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe are all provided with a stop valve.

[0012] Optionally, both the first drain pipe and the second drain pipe are provided with filters.

[0013] Optionally, the marine ammonia treatment system further includes a seawater cooling system, which includes a cooling pipeline, the first heat exchanger and the second heat exchanger. The first heat exchanger and the second heat exchanger are connected in parallel through the cooling pipeline, and seawater flows in the cooling pipeline.

[0014] Optionally, a first exhaust pipe is provided on the top of the first processing tank, and the first exhaust pipe is connected to the third processing tank.

[0015] Optionally, the top of the waste liquid collection tank is connected to a waste gas exhaust pipe, and the waste gas exhaust pipe is connected to the third processing tank.

[0016] Another object of the present invention is to provide a method for treating marine ammonia, wherein the method uses the marine ammonia treatment system as described in any of the above schemes, comprising the steps of:

[0017] S1. Pass the ammonia generated by the ship's ammonia fuel system into the above-mentioned ammonia collection tank for recovery; S2. Pass the ammonia in the above-mentioned ammonia collection tank into the above-mentioned first treatment tank, and use the above-mentioned first water spray pipe to spray water to absorb the ammonia. The unsaturated aqueous solution that has absorbed the ammonia flows through the above-mentioned first heat exchanger to cool and then flows back into the above-mentioned first water spray pipe; S3. Pass the remaining ammonia in the above-mentioned first treatment tank into the above-mentioned second treatment tank, and use the above-mentioned second water spray pipe to spray water to absorb the ammonia. The unsaturated aqueous solution that has absorbed the ammonia flows through the above-mentioned second heat exchanger to cool and then flows back into the above-mentioned second water spray pipe; S4. Pass the remaining ammonia in the above-mentioned second treatment tank into the third treatment tank, and use the above-mentioned third water spray pipe to spray acidic solution to absorb the ammonia. The acidic solution that has absorbed the ammonia circulates into the above-mentioned third water spray pipe, and the exhaust port of the above-mentioned third treatment tank discharges the remaining gas inside into the atmosphere; S5. The remaining solution in the above-mentioned first treatment tank and the remaining solution in the above-mentioned second treatment tank are discharged into the waste liquid collection tank.

[0018] Beneficial effects:

[0019] The marine ammonia treatment system of the present invention uses an ammonia collection tank to recover ammonia generated by the ship's ammonia fuel system, and then passes the ammonia into a first treatment tank, and uses a first water spray pipe to spray water to absorb the ammonia. The unsaturated aqueous solution that has absorbed the ammonia flows through a first heat exchanger for cooling and then flows back into the first water spray pipe for reuse; then the ammonia remaining in the first treatment tank is passed into a second treatment tank, and uses a second water spray pipe to spray water to absorb the ammonia. The unsaturated aqueous solution that has absorbed the ammonia flows through a second heat exchanger for cooling and then flows back into the second water spray pipe for reuse; then the ammonia remaining in the second treatment tank is passed into a third treatment tank, and uses the third water spray pipe to spray an acidic solution to absorb the ammonia. The acidic solution that has absorbed the ammonia circulates into the third water spray pipe for reuse, and the exhaust port of the third treatment tank discharges the remaining gas inside to the atmosphere. At this time, the discharged gas is a gas that meets environmental protection requirements; at the same time, the remaining solution in the first treatment tank and the remaining solution in the second treatment tank are discharged into a waste liquid collection tank to avoid polluting the external environment. The ammonia treatment system has a simple structure, low maintenance and operating costs, and has the advantages of high absorption efficiency, low cost, safety and reliability. It can reduce ammonia emissions and ensure that the ammonia emission concentration meets environmental protection standards. At the same time, water is used to absorb most of the ammonia, reducing the use of acidic solutions and lowering treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a marine ammonia treatment system provided by a specific embodiment of the present invention.

[0021] In the picture:

[0022] 10. Ammonia collection tank; 11. Pressure regulating valve; 12. Flow sensor;

[0023] 20. First treatment tank; 21. First water spray pipe; 22. First liquid discharge pipe; 23. First branch pipe; 24. Second branch pipe; 25. Stop valve; 26. Filter; 27. Water pump; 28. First exhaust pipe;

[0024] 30. Second treatment tank; 31. Second water spray pipe; 32. Second liquid discharge pipe; 33. Third branch pipe; 34. Fourth branch pipe;

[0025] 40. Third treatment tank; 41. Third water spray pipe;

[0026] 51. First heat exchanger; 52. Second heat exchanger; 53. Cooling pipeline;

[0027] 60. Waste liquid collection tank; 61. Waste gas exhaust pipe. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0029] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0032] like Figure 1As shown, the marine ammonia treatment system includes an ammonia collection tank 10, a first treatment tank 20, a second treatment tank 30, a third treatment tank 40 and a waste liquid collection tank 60. The ammonia collection tank 10 is used to recover ammonia generated by the ship's ammonia fuel system; the outlet of the ammonia collection tank 10 is connected to the first treatment tank 20, the top of the first treatment tank 20 is connected to a first water spray pipe 21, the first drain pipe 22 at the bottom of the first treatment tank 20 is connected to the first water spray pipe 21, the first drain pipe 22 is connected to the first heat exchanger 51 for heat exchange, and a cooling medium flows in the first heat exchanger 51; the exhaust port of the first treatment tank 20 is connected to the second treatment tank 30, the top of the second treatment tank 30 is connected to the second water spray pipe 31, and the third The second drain pipe 32 at the bottom of the second treatment tank 30 is connected to the above-mentioned second water spray pipe 31, and the above-mentioned second drain pipe 32 is connected to the second heat exchanger 52 for heat exchange, and a cooling medium flows in the above-mentioned second heat exchanger 52; the exhaust port of the above-mentioned second treatment tank 30 is connected to the above-mentioned third treatment tank 40, and the top of the above-mentioned third treatment tank 40 is connected to the third water spray pipe 41, and an acidic solution flows in the above-mentioned third water spray pipe 41. The bottom of the above-mentioned third treatment tank 40 is connected to the above-mentioned third water spray pipe 41, and the exhaust port of the above-mentioned third treatment tank 40 is connected to the atmosphere; the above-mentioned first drain pipe 22 is selectively connected to the above-mentioned waste liquid collection tank 60 and the above-mentioned first water spray pipe 21, and the above-mentioned second drain pipe 32 is selectively connected to the above-mentioned waste liquid collection tank 60 and the above-mentioned second water spray pipe 31.

[0033] The marine ammonia treatment system of this embodiment uses an ammonia collection tank 10 to recover ammonia generated by the ship's ammonia fuel system, and then passes the ammonia into the first treatment tank 20, and uses the first water spray pipe 21 to spray water to absorb the ammonia. The unsaturated aqueous solution that has absorbed the ammonia flows through the first heat exchanger 51 to cool down and then flows back into the first water spray pipe 21 for reuse; then the remaining ammonia in the first treatment tank 20 is passed into the second treatment tank 30, and uses the second water spray pipe 31 to spray water to absorb the ammonia. The unsaturated aqueous solution that has absorbed the ammonia flows through the second heat exchanger 52 to cool down and then flows back into the first water spray pipe 21 for reuse. The ammonia remaining in the second treatment tank 30 is then passed into the third treatment tank 40, and the acidic solution is sprayed out using the third water spray pipe 41 to absorb the ammonia. The acidic solution that has absorbed the ammonia is circulated into the third water spray pipe 41 for reuse. The exhaust port of the third treatment tank 40 discharges the remaining gas inside into the atmosphere. At this time, the discharged gas meets environmental protection requirements. At the same time, the remaining solution in the first treatment tank 20 and the remaining solution in the second treatment tank 30 are discharged into the waste liquid collection tank 60 to avoid polluting the external environment. The ammonia treatment system has a simple structure, low maintenance and operating costs, and has the advantages of high absorption efficiency, low cost, safety and reliability. It can reduce ammonia emissions and ensure that the ammonia emission concentration meets environmental protection standards. At the same time, water is used to absorb most of the ammonia, reducing the use of acidic solution and reducing treatment costs.

[0034] Furthermore, when the residual solution in the first treatment tank 20 and the residual solution in the second treatment tank 30 are discharged into the waste liquid collection tank 60 , the residual solution is ammonia water with a concentration of not less than 30%.

[0035] Specifically, after the first water spray pipe 21 sprays, water will accumulate at the bottom of the first treatment tank 20, and ammonia will be discharged from the bottom of the first treatment tank 20, so that the ammonia will be first absorbed by the water at the bottom and then absorbed by the first water spray pipe 21; similarly, after the second water spray pipe 31 sprays, water will accumulate at the bottom of the second treatment tank 30, and ammonia will be discharged from the bottom of the second treatment tank 30, so that the ammonia will be first absorbed by the water at the bottom and then absorbed by the second water spray pipe 31; and, after the third water spray pipe 41 sprays, acidic solution will accumulate at the bottom of the second treatment tank 30, and ammonia will be discharged from the bottom of the third treatment tank 40, so that the ammonia will be first absorbed by the acidic solution at the bottom and then absorbed by the third water spray pipe 41.

[0036] Optionally, a pressure regulating valve 11 is provided at the outlet of the ammonia collection tank 10 to regulate the outlet pressure of the ammonia collection tank 10. The parameter design of the pressure regulating valve 11 depends on the operating pressure of the ammonia collection tank 10. The pressure regulating valve 11 can adjust the outlet flow rate and outlet pressure of the ammonia collection tank 10 to maintain a constant pressure of the ammonia entering the first treatment tank 20, thereby improving the stability of system operation.

[0037] Furthermore, a flow sensor 12 is provided at the outlet of the ammonia collection tank 10. The flow sensor 12 monitors the outlet flow of the ammonia collection tank 10 in real time, thereby determining the outlet pressure of the ammonia collection tank 10 and adjusting the power and flow of the water pump 27 to ensure that the exhaust pressure and exhaust flow of the ammonia collection tank 10 remain constant.

[0038] In this embodiment, a stop check valve is provided at the inlet of the ammonia collection tank 10. The number, diameter and pressure level of the stop check valve depend on the ammonia source pipeline and can be reasonably designed according to actual conditions. The volume and pressure of the ammonia collection tank 10 depend on the discharge and purge capacity of the ammonia source equipment, and its actual volume needs to ensure a certain design redundancy and margin factor.

[0039] Please continue to refer to Figure 1 The second drain pipe 32 is connected to the top of the first treatment tank 20 and is connected to the waste liquid collection tank 60 through the first drain pipe 22. That is, the residual waste liquid in the second treatment tank 30 is not directly discharged into the waste liquid collection tank 60 through the second drain pipe 32, but is indirectly connected to the waste liquid collection tank 60 through the second drain pipe 32 connected to the first treatment tank 20. This can shorten the length of the pipeline, reduce the complexity of the pipeline, and reduce the manufacturing cost.

[0040] Specifically, the outlet of the above-mentioned first drainage pipe 22 is connected to the first branch pipe 23 and the second branch pipe 24, the above-mentioned first branch pipe 23 is connected to the above-mentioned first water spray pipe 21, and the above-mentioned second branch pipe 24 is connected to the above-mentioned waste liquid collection tank 60; the outlet of the above-mentioned second drainage pipe 32 is connected to the third branch pipe 33 and the fourth branch pipe 34, the above-mentioned third branch pipe 33 is connected to the above-mentioned second water spray pipe 31, and the above-mentioned fourth branch pipe 34 is connected to the top of the above-mentioned first treatment tank 20; the above-mentioned first branch pipe 23, the above-mentioned second branch pipe 24, the above-mentioned third branch pipe 33 and the above-mentioned fourth branch pipe 34 are all provided with a stop valve 25. Through the design of the first branch pipe 23, the second branch pipe 24, the third branch pipe 33 and the fourth branch pipe 34 and the stop valve 25, one of the first branch pipe 23 and the second branch pipe 24 can be connected, and one of the third branch pipe 33 and the fourth branch pipe 34 can be connected, thereby realizing selective connection between the first drain pipe 22 and the waste liquid collection tank 60 or the first water spray pipe 21, and selective connection between the second drain pipe 32 and the first treatment tank 20 and the second water spray pipe 31.

[0041] Furthermore, both the first liquid discharge pipe 22 and the second liquid discharge pipe 32 are provided with a filter 26. The filter 26 can filter the liquid discharged from the first liquid discharge pipe 22 and the second liquid discharge pipe 32 to prevent impurities from clogging the first water spray pipe 21 or the second water spray pipe 31, thereby ensuring the reliable operation of the marine ammonia treatment system and reducing maintenance costs.

[0042] In this embodiment, the marine ammonia treatment system further includes a seawater cooling system, which includes a cooling pipeline 53, the first heat exchanger 51, and the second heat exchanger 52. The first and second heat exchangers 51, 52 are connected in parallel via the cooling pipeline 53, through which seawater flows. The connection between the seawater and the cooling pipeline 53, i.e., the seawater serves as a cooling medium for heat exchange between the first and second heat exchangers 51, 52, thereby cooling the high-temperature ammonia-containing aqueous solution in the first and second drainage pipes 22, 32. The seawater is used as a medium to remove heat generated by the dissolution of ammonia in the water. The cooled ammonia solution is then sprayed and absorbed by the ammonia through the nozzles, thereby reducing cooling costs.

[0043] Please continue to refer to Figure 1 Optionally, a first exhaust pipe 28 is provided at the top of the first treatment tank 20, and the first exhaust pipe 28 is connected to the third treatment tank 40. This arrangement allows the small amount of ammonia remaining in the first treatment tank 20 to be passed to the third treatment tank 40 for final treatment, thereby improving the absorption efficiency of ammonia treatment and preventing environmental pollution caused by residual ammonia.

[0044] In this embodiment, the top of the waste liquid collection tank 60 is connected to an exhaust gas discharge pipe 61, which is connected to the third treatment tank 40. The waste liquid collection tank 60 contains a large amount of ammonia-containing wastewater with a high concentration, which is prone to ammonia volatilization. Therefore, the ammonia generated by secondary volatilization in the waste liquid collection tank 60 is passed into the third treatment tank 40 for treatment. This prevents secondary environmental pollution caused by ammonia leakage, further improves the ammonia absorption efficiency of the marine ammonia treatment system, and ensures that the ammonia emission concentration meets environmental standards.

[0045] Furthermore, the volume and pressure of the waste liquid collection tank 60 need to take into account the number of ammonia treatments and the actual navigation path of the ship. Its actual volume needs to ensure a certain design redundancy and margin coefficient so that it can completely collect the ammonia-containing waste liquid generated during the entire navigation process.

[0046] Water pumps 27 are installed in the circulation lines of the first and second drainage pipes 22, 32, and third spray pipes 41 of the third treatment tank 40, as well as the outlet of the waste liquid collection tank 60. These pumps drive the liquid flow and ensure continuous and reliable operation of the system. The design parameters of water pumps 27 must be considered in the actual deployment location and distance from shore, and will not be detailed here.

[0047] This embodiment further provides a method for treating marine ammonia, which uses the marine ammonia treatment system described in any of the above solutions, including the following steps:

[0048] S1. Passing ammonia generated by the ship's ammonia fuel system into the ammonia collection tank 10 for recovery; S2. Passing the ammonia in the ammonia collection tank 10 into the first treatment tank 20, and using the first water spray pipe 21 to spray water to absorb the ammonia, and the unsaturated aqueous solution that has absorbed the ammonia flows through the first heat exchanger 51 to cool down and then flows back into the first water spray pipe 21; S3. Passing the remaining ammonia in the first treatment tank 20 into the second treatment tank 30, and using the second water spray pipe 31 to spray water to absorb the ammonia, and the unsaturated aqueous solution that has absorbed the ammonia flows through the second heat exchanger 52 to cool down and then flows back into the second water spray pipe 31; S4. Passing the remaining ammonia in the second treatment tank 30 into the third treatment tank 40, and using the third water spray pipe 41 to spray an acidic solution to absorb the ammonia, and the acidic solution that has absorbed the ammonia circulates into the third water spray pipe 41, and the exhaust port of the third treatment tank 40 discharges the remaining gas inside to the atmosphere;

[0049] S5 , the remaining solution in the first treatment tank 20 and the remaining solution in the second treatment tank 30 are discharged into the waste liquid collection tank 60 .

[0050] This method for treating ammonia for ship uses a system for treating ammonia for ship as described in any of the above schemes, thus having the beneficial effects of the system for treating ammonia for ship as described in any of the above schemes, which will not be described in detail here. Specifically, this ammonia treatment scheme can use water to carry out the first-stage treatment and the second-stage treatment of ammonia generated by the ship's ammonia fuel system, and the small amount of ammonia remaining after the treatment is completed is finally treated with the acidic solution of the third treatment tank 40, which has lower costs and higher absorption efficiency; at the same time, the waste liquid generated by the treatment is passed into the waste liquid collection tank 60 for collection to avoid polluting the environment. This ammonia treatment method has the advantages of high absorption efficiency, low cost, safety and reliability, can reduce ammonia emissions, and ensure that the ammonia emission concentration meets environmental protection standards; at the same time, water is used to absorb most of the ammonia, which reduces the use of acidic solutions and reduces treatment costs.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Marine ammonia treatment system, characterized in that: include: An ammonia collection tank (10), wherein the ammonia collection tank (10) is used to recover ammonia generated by a ship's ammonia fuel system; a first treatment tank (20), wherein the outlet of the ammonia collection tank (10) is connected to the first treatment tank (20), the top of the first treatment tank (20) is connected to a first water spray pipe (21), a first liquid discharge pipe (22) at the bottom of the first treatment tank (20) is connected to the first water spray pipe (21), the first liquid discharge pipe (22) is connected to a first heat exchanger (51) for heat exchange, and a cooling medium flows in the first heat exchanger (51); a second treatment tank (30), wherein the exhaust port of the first treatment tank (20) is connected to the second treatment tank (30), the top of the second treatment tank (30) is connected to a second water spray pipe (31), a second liquid discharge pipe (32) at the bottom of the second treatment tank (30) is connected to the second water spray pipe (31), the second liquid discharge pipe (32) is connected to a second heat exchanger (52) for heat exchange, and a cooling medium flows in the second heat exchanger (52); a third treatment tank (40), wherein the exhaust port of the second treatment tank (30) is connected to the third treatment tank (40), the top of the third treatment tank (40) is connected to a third water spray pipe (41), an acidic solution flows in the third water spray pipe (41), the bottom of the third treatment tank (40) is connected to the third water spray pipe (41), and the exhaust port of the third treatment tank (40) is connected to the atmosphere; A waste liquid collection tank (60), the first liquid discharge pipe (22) is selectively connected to the waste liquid collection tank (60) and the first water spray pipe (21), and the second liquid discharge pipe (32) is selectively connected to the waste liquid collection tank (60) and the second water spray pipe (31).

2. The marine ammonia treatment system according to claim 1, characterized in that: The outlet of the ammonia collection tank (10) is provided with a pressure regulating valve (11), and the pressure regulating valve (11) is used to adjust the outlet pressure of the ammonia collection tank (10).

3. The marine ammonia treatment system according to claim 2, characterized in that: The outlet of the ammonia collection tank (10) is provided with a flow sensor (12).

4. The marine ammonia treatment system according to claim 1, characterized in that: The second drain pipe (32) is connected to the top of the first treatment tank (20), and is connected to the waste liquid collection tank (60) through the first drain pipe (22).

5. The marine ammonia treatment system according to claim 4, characterized in that: The outlet of the first liquid discharge pipe (22) is connected to a first branch pipe (23) and a second branch pipe (24), the first branch pipe (23) is connected to the first water spray pipe (21), and the second branch pipe (24) is connected to the waste liquid collection tank (60); the outlet of the second liquid discharge pipe (32) is connected to a third branch pipe (33) and a fourth branch pipe (34), the third branch pipe (33) is connected to the second water spray pipe (31), and the fourth branch pipe (34) is connected to the top of the first treatment tank (20); the first branch pipe (23), the second branch pipe (24), the third branch pipe (33) and the fourth branch pipe (34) are all provided with a stop valve (25).

6. The marine ammonia treatment system according to claim 5, characterized in that: The first liquid discharge pipe (22) and the second liquid discharge pipe (32) are both provided with a filter (26).

7. The marine ammonia treatment system according to any one of claims 1 to 6, characterized in that: The marine ammonia treatment system further comprises a seawater cooling system, the seawater cooling system comprising a cooling pipeline (53), the first heat exchanger (51) and the second heat exchanger (52), the first heat exchanger (51) and the second heat exchanger (52) being connected in parallel via the cooling pipeline (53), and seawater flowing in the cooling pipeline (53).

8. The marine ammonia treatment system according to any one of claims 1 to 6, characterized in that: A first exhaust pipe (28) is provided on the top of the first treatment tank (20), and the first exhaust pipe (28) is connected to the third treatment tank (40).

9. The marine ammonia treatment system according to any one of claims 1 to 6, characterized in that: The top of the waste liquid collection tank (60) is connected to a waste gas exhaust pipe (61), and the waste gas exhaust pipe (61) is connected to the third processing tank (40).

10. A method for treating marine ammonia, characterized in that: The marine ammonia treatment system according to any one of claims 1 to 9 comprises the following steps: S1, passing ammonia generated by the ship's ammonia fuel system into the ammonia collection tank (10) for recovery; S2, passing the ammonia in the ammonia collection tank (10) into the first treatment tank (20), and using the first water spray pipe (21) to spray water to absorb the ammonia, and the unsaturated aqueous solution that has absorbed the ammonia flows through the first heat exchanger (51) to cool down and then flows back into the first water spray pipe (21); S3, passing the ammonia remaining in the first treatment tank (20) into the second treatment tank (30), and using the second water spray pipe (31) to spray water to absorb the ammonia, and the unsaturated aqueous solution that has absorbed the ammonia flows through the second heat exchanger (52) to cool down and then flows back into the second water spray pipe (31); S4, passing the remaining ammonia in the second treatment tank (30) into the third treatment tank (40), and using the third water spray pipe (41) to spray an acidic solution to absorb the ammonia, the acidic solution that has absorbed the ammonia circulates and flows into the third water spray pipe (41), and the exhaust port of the third treatment tank (40) discharges the remaining gas inside into the atmosphere; S5. The remaining solution in the first treatment tank (20) and the remaining solution in the second treatment tank (30) are discharged into the waste liquid collection tank (60).

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