Exhaust gas treatment system for ammonia fuel engine and ammonia fuel engine

Abstract

The present application relates to a kind of ammonia fuel engine exhaust treatment system and ammonia fuel engine, ammonia fuel engine exhaust treatment system includes: denitration reactor (5), including the exhaust gas input end for introducing the exhaust gas to be treated;Plasma generating device (4) is connected with the denitration reactor (5) and is configured to provide the plasma for denitration to the denitration reactor (5);Washing tower (7), including shell (12), the exhaust gas inlet for being connected with the exhaust gas output end of the denitration reactor (5) and being arranged on the shell (12), and first spray component (13) for spraying the washing liquid for absorbing ammonia gas is arranged in the shell (12) and is realized that nitrogen oxides in exhaust gas can be removed and ammonia gas in exhaust gas can be removed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine exhaust treatment, in particular to an ammonia fuel engine exhaust treatment system and an ammonia fuel engine. BACKGROUND

[0002] With the rapid development of marine transportation, global greenhouse gas emissions have gradually increased. In 2018, the International Maritime Organization proposed a strategy for reducing greenhouse gas emissions in the shipping industry, which proposed to reduce the annual total greenhouse gas emissions by 50% by 2050 based on the total annual greenhouse gas emissions in 2008, and move towards the goal of green zero carbon emissions. Countries have taken corresponding emission reduction measures. Energy is the main body, and it is urgent for China to transform to low-carbon and zero-carbon energy as soon as possible. Ammonia is an ideal carbon-free fuel, and in terms of unit mass energy storage, the energy density of ammonia is even higher than that of batteries, close to fossil fuels, so the good energy storage capacity and transportation safety characteristics are the great advantages of ammonia as fuel. Under the promotion of the "double carbon" policy, ammonia engine is expected to become the main power device of the ship. Although the pure ammonia engine avoids the emission of CO2, SOX and other pollutants, it will produce problems of NO, NO2 and ammonia escape.

[0003] At present, the single pollutant removal technology of SCR technology for removing nitrogen oxides on ships is relatively mature, which has the advantages of high efficiency and good reliability. However, the biggest problem restricting the development of SCR technology is the use of catalysts. The catalysts of the SCR system need to be replaced and maintained regularly, which increases the use cost and reduces the economic benefit. In addition, the gas composition in the exhaust gas of the pure ammonia engine has changed. Since the pure ammonia engine will produce the problem of ammonia escape, a certain amount of ammonia gas will exist in the exhaust gas, which needs to be absorbed to prevent poisoning and pollution problems.

[0004] The deficiencies of the existing pure ammonia engine exhaust treatment technology for ships mainly lie in three aspects: first, when using selective non-catalytic reduction technology (SNCR) to treat NOX, ammonia gas is corrosive, and a large amount of ammonia gas sprayed into the engine will cause stress corrosion, which will have a certain impact on the engine work and service life; second, when using selective catalytic reduction technology (SCR), the catalysts in the SCR system need to be maintained and replaced regularly, which increases the use cost; third, when using ammonia engine as a power source, the problem of ammonia escape will occur, and a certain amount of ammonia gas will exist in the exhaust gas, which needs to be treated in time. SUMMARY

[0005] The present application aims to provide an ammonia fuel engine exhaust treatment system and an ammonia fuel engine that can effectively remove nitrogen oxides and ammonia gas from ammonia fuel engines.

[0006] According to an aspect of an embodiment of the present application, there is provided an exhaust gas treatment system for an ammonia fuel engine, the exhaust gas treatment system comprising:

[0007] a denitration reactor including an exhaust gas input for introducing exhaust gas to be treated;

[0008] a plasma generating device connected to the denitration reactor and configured to supply plasma for denitration to the denitration reactor; and

[0009] a scrubbing tower including a housing, an exhaust gas inlet provided on the housing and connected to an exhaust gas output of the denitration reactor, and a first spray member provided in the housing for spraying a scrubbing liquid for absorbing ammonia gas.

[0010] In some embodiments, the plasma generating device includes an arc plasma generating device.

[0011] In some embodiments, the exhaust gas treatment system for the ammonia fuel engine further includes an ammonia fuel tank connected to the plasma generating device to supply ammonia gas for ionization excitation to the plasma generating device.

[0012] In some embodiments, the ammonia fuel tank is connected to an engine body of the ammonia fuel engine to supply fuel to the engine body.

[0013] In some embodiments, the exhaust gas treatment system for the ammonia fuel engine further includes a first heat exchanger including an ammonia fuel flow path and a first exhaust gas flow path in heat exchange with the ammonia fuel flow path, an inlet end of the first exhaust gas flow path being connected to an exhaust gas port of an engine body of the ammonia fuel engine, an outlet end of the first exhaust gas flow path being connected to the exhaust gas input of the denitration reactor, an inlet end of the ammonia fuel flow path being connected to the ammonia fuel tank, and an outlet end of the ammonia fuel flow path being connected to at least one of the plasma generating device and the engine body.

[0014] In some embodiments, the scrubbing tower further includes a second spray member provided above the first spray member.

[0015] In some embodiments, the first spray member includes a plurality of first spray nozzles, and the second spray member includes a plurality of second spray nozzles, the first spray nozzles being arranged in a staggered manner with the second spray nozzles.

[0016] In some embodiments, the plurality of first spray nozzles are arranged in a circular shape, and the plurality of second spray nozzles are arranged in a circular shape.

[0017] In some embodiments, the exhaust treatment system of the ammonia fuel engine further comprises a scrubbing liquid tank and a second heat exchanger, the second heat exchanger comprising a scrubbing liquid flow path and a second exhaust gas flow path in heat exchange with the scrubbing liquid flow path, an inlet end of the second exhaust gas flow path being connected to an exhaust port of the engine body of the ammonia fuel engine, an outlet end of the second exhaust gas flow path being connected to an exhaust gas input end of the denitration reactor, an inlet end of the scrubbing liquid flow path being connected to the scrubbing liquid tank, and an outlet end of the scrubbing liquid flow path being connected to at least one of the first spraying component and the second spraying component.

[0018] In some embodiments, the scrubbing liquid comprises an oxidizing solution or a sodium persulfate solution.

[0019] In some embodiments, the plasma generating device comprises a plasma generating device body and a water cooler for cooling the plasma generating device body, the water cooler being used to circulate desalination chemical water.

[0020] In some embodiments, the housing of the scrubbing tower is further provided with an outlet for outputting exhaust gas, and a mist eliminator is arranged at the outlet.

[0021] In some embodiments, the mist eliminator is a wave-shaped plate mist eliminator.

[0022] In some embodiments, the exhaust treatment system of the ammonia fuel engine further comprises a filter and / or a drying device connected between the ammonia fuel tank and the plasma generating device.

[0023] In some embodiments, the exhaust treatment system of the ammonia fuel engine further comprises a compression device and a pressure stabilizing device connected between the ammonia fuel tank and the plasma generating device.

[0024] According to another aspect of the present application, there is also provided an ammonia fuel engine, characterized in that the ammonia fuel engine comprises the above-mentioned exhaust treatment system of the ammonia fuel engine.

[0025] By applying the technical solution of the present application, the exhaust gas discharged from the engine body of the ammonia fuel engine is first subjected to denitration in the denitration reactor, and the exhaust gas subjected to denitration treatment is then introduced into the scrubbing tower, and the first spraying component sprays the scrubbing liquid toward the exhaust gas to dissolve the ammonia gas in the exhaust gas in the scrubbing liquid, thereby achieving both removal of nitrogen oxides in the exhaust gas and removal of ammonia gas in the exhaust gas.

[0026] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0028] Figure 1 A structural schematic diagram of an exhaust gas treatment system of an ammonia fuel engine is shown. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] As shown in Figure 1 , the exhaust gas treatment system of the ammonia fuel engine in the present embodiment includes a denitration reactor 5, a plasma generating device 4 and a scrubber 7. The denitration reactor 5 includes an exhaust gas input end for introducing exhaust gas to be treated; the plasma generating device 4 is connected with the denitration reactor 5 and is configured to provide plasma for denitration to the denitration reactor 5; the scrubber 7 includes a shell 12, an exhaust gas inlet provided on the shell 12 and connected with an exhaust gas output end of the denitration reactor 5, and a first spraying component 13 provided in the shell 12 for spraying a scrubbing liquid for absorbing ammonia gas.

[0031] In the present embodiment, the exhaust gas discharged from the engine body 1 of the ammonia fuel engine is first subjected to denitration in the denitration reactor 5, and the exhaust gas subjected to the denitration treatment is then introduced into the scrubber 7, and the first spraying component 13 sprays the scrubbing liquid to the exhaust gas to dissolve the ammonia gas in the exhaust gas in the scrubbing liquid, so that both the nitrogen oxides in the exhaust gas and the ammonia gas in the exhaust gas can be removed.

[0032] In some embodiments, the plasma generating device 4 includes an arc plasma generating device.

[0033] In some embodiments, the exhaust treatment system of the ammonia fuel engine further comprises an ammonia fuel tank 3, which is connected to the plasma generating device 4 to provide the plasma generating device 4 with ammonia gas for excitation ionization. The exhaust treatment system ionizes the reducing agent ammonia gas into a plasma state by using the arc plasma generating device 4 with ammonia gas as the carrier wind, and introduces the generated ammonia gas in a plasma state into the denitration reactor to react with NO X (nitrogen oxides) in the pure ammonia engine exhaust to generate N2(nitrogen) through a reduction reaction, thereby achieving removal of NO X from the exhaust.

[0034] In some embodiments, the scrubbing liquid comprises an oxidizing solution, preferably a sodium persulfate solution.

[0035] A scrubbing tower 7 is arranged downstream of the denitration reactor 5. The scrubbing tower 7 not only further removes the unreacted NOx in the denitration reactor 5, thereby improving the NO X removal efficiency of the entire system, but also uses the scrubbing liquid to absorb the escaped ammonia gas by taking advantage of the characteristic that ammonia gas is extremely soluble in water, thereby preventing the ammonia gas from being discharged and causing poisoning hazards.

[0036] In some embodiments, the ammonia fuel tank 3 is connected to the engine body 1 of the ammonia fuel engine to provide fuel to the engine body 1.

[0037] The exhaust treatment system of the ammonia fuel engine further comprises a first heat exchanger 11, which comprises an ammonia fuel flow path and a first exhaust gas flow path that exchanges heat with the ammonia fuel flow path. The inlet end of the first exhaust gas flow path is connected to the exhaust port of the engine body 1 of the ammonia fuel engine, and the outlet end of the first exhaust gas flow path is connected to the exhaust gas input end of the denitration reactor 5. The inlet end of the ammonia fuel flow path is connected to the ammonia fuel tank 3, and the outlet end of the ammonia fuel flow path is connected to at least one of the plasma generating device 4 and the engine body 1.

[0038] The liquid ammonia in the ammonia fuel tank 3 is transported through a pipeline into the first heat exchanger 11 to exchange heat using the waste heat of the exhaust gas. After being vaporized through heat exchange, most of the ammonia gas obtained is combusted as fuel for the ammonia engine body 1, and a small amount of ammonia gas is used as the carrier wind of the generator in the arc plasma generating device 4. In the generator, the ammonia gas is excited and ionized into a plasma state by the high-temperature arc, and a large number of positive and negative ions, free radicals, and electrons are generated.

[0039] In some embodiments, the scrubbing tower 7 further comprises a second spraying component 14 arranged above the first spraying component 13.

[0040] In some embodiments, the first spraying component 13 comprises a plurality of first nozzles, and the second spraying component 14 comprises a plurality of second nozzles. The first nozzles and the second nozzles are arranged in a staggered manner.

[0041] The first spraying component 13 mainly functions to reduce temperature and absorb ammonia gas, and the second spraying component 14 sprays sodium persulfate solution, which has strong oxidizing free radicals, into the exhaust gas, which has not reacted completely with NO X The oxidization reaction occurs to generate nitrate and sulfate, the treated exhaust gas is directly discharged into the atmosphere through the upper exhaust gas outlet of the demister in the washing tower 7, and the remaining waste liquid is discharged from the lower outlet of the washing tower and enters the waste liquid storage tank 8.

[0042] In some embodiments, the plurality of first nozzles are arranged in a circle, and the plurality of second nozzles are arranged in a circle.

[0043] Two layers of atomizing nozzles are arranged inside the washing tower 7, each layer is arranged in a ring shape, and the lower layer of nozzles is rotated by 45° clockwise compared to the upper layer of nozzles as a whole, so that the upper and lower nozzle positions are staggered, the angle between adjacent nozzles in each layer is 30°, and the liquid coverage is ensured to be 200%, and the liquid-gas ratio is maintained at 12 L / m3.

[0044] The exhaust gas treatment system of the ammonia fuel engine further includes a washing liquid tank 2 and a second heat exchanger 6, the second heat exchanger 6 includes a washing liquid flow path and a second exhaust gas flow path for heat exchange with the washing liquid flow path, the inlet end of the second exhaust gas flow path is connected with the exhaust port of the engine body 1 of the ammonia fuel engine, the outlet end of the second exhaust gas flow path is connected with the exhaust gas input end of the denitration reactor 5, the inlet end of the washing liquid flow path is connected with the washing liquid tank 2, and the outlet end of the washing liquid flow path is connected with at least one of the first spraying component 13 and the second spraying component 14. The pure ammonia engine exhaust gas waste heat is used for heat exchange with the washing liquid respectively, so that the washing liquid can generate a large number of strong oxidizing free radicals after being activated by heating, the oxidation capacity is increased, the reaction activity is improved, and the reaction capacity with NOX is enhanced.

[0045] In some embodiments, the plasma generating device 4 includes a plasma generating device body and a water cooler for cooling the plasma generating device body, and the water cooler is used for circulating desalination chemical water.

[0046] In some embodiments, the shell 12 of the washing tower 7 is further provided with an outlet for outputting exhaust gas, and a demister is arranged at the outlet.

[0047] In some embodiments, the demister is a wave-shaped plate demister, which is made of high-temperature-resistant and corrosion-resistant materials.

[0048] In some embodiments, the exhaust gas treatment system of the ammonia fuel engine further includes a filter and / or drying device connected between the ammonia fuel tank 3 and the plasma generating device 4.

[0049] The exhaust treatment system of the ammonia fuel engine further comprises a compression device and a pressure stabilizing device connected between the ammonia fuel tank 3 and the plasma generating device 4. The ammonia gas entering the plasma generating device 4 must be purified by compression, filtration and drying, and then reduced in pressure by a generator gas supply main pipe pressure reducing valve and stabilized in pressure before being sent to the vicinity of the plasma generator.

[0050] The exhaust treatment system of the ammonia fuel engine comprises an engine body 1 using pure ammonia as fuel, a scrubbing liquid tank 2 storing sodium persulfate solution or other oxidizing solution, an ammonia fuel tank 3 storing liquid ammonia, a plasma generating device 4, a denitration reactor 5, a first heat exchanger 11, a second heat exchanger 6, a scrubbing tower 7, an exhaust gas storage tank 8 and a four-way control valve 9. The exhaust gas output end of the pure ammonia engine 1 is connected to the four-way control valve 9, the four-way control valve 9 is connected to the exhaust gas input end of the heat exchanger 6 and the denitration reactor 5 respectively, the exhaust gas output end of the heat exchanger 6 and the denitration reactor 5 is connected to the four-way control valve 9 near the denitration reactor, the four-way control valve 9 is connected to the exhaust gas input end of the denitration reactor 5, the exhaust gas output end of the denitration reactor 5 is connected to the exhaust gas inlet of the scrubbing tower 7, and the exhaust liquid outlet at the lower part of the scrubbing tower 7 is connected to the exhaust liquid storage tank 8.

[0051] The outlet of the scrubbing liquid tank 2 is connected to the scrubbing liquid input end of the second heat exchanger 6, and the scrubbing liquid output end of the second heat exchanger 6 is connected to the two-layer spraying components of the scrubbing tower 7.

[0052] The outlet of the ammonia fuel tank 3 is connected to the liquid ammonia input end of the first heat exchanger 11, the ammonia gas output end of the first heat exchanger 11 is connected to the ammonia input end of the pure ammonia engine 1 and the input end of the plasma generating device 4 respectively, and the output end of the plasma generating device 4 is connected to the electric arc input end of the denitration reactor.

[0053] The working principle of the exhaust treatment system of the ammonia fuel engine of the present embodiment is as follows:

[0054] a. The exhaust gas discharged from the pure ammonia engine 1 enters the four-way control valve 9 through the exhaust pipeline, and the exhaust gas is divided into three parts in the four-way control valve 9. The first part of the exhaust gas enters the inside of the folded pipe flue of the second heat exchanger 6 to provide heat energy for the activation of sodium persulfate, and after a series of heat exchange, it is discharged from the folded pipe flue of the second heat exchanger 6 and flows into the four-way control valve 9 before the denitration reactor 5; the second part of the exhaust gas directly flows into the four-way control valve 9 before the denitration reactor 5; the third part of the exhaust gas enters the inside of the folded pipe flue of the first heat exchanger 11 to provide heat for the vaporization of liquid ammonia, and then is discharged from the folded pipe flue of the heat exchanger 6 and flows into the four-way control valve 9 before the denitration reactor 5.

[0055] b. The three streams of waste gas, combined in the four-way control valve 9 before the denitrification reactor 5, enter the denitrification reactor 5. Inside the denitrification reactor 5, ammonia gas, ionized by the arc plasma generator 4, is present. The ionized ammonia gas contains a large number of positive and negative ions, free radicals, and electrons, which undergo strong elastic and inelastic collisions with the waste gas. This process enhances the activity of each gaseous component and simultaneously increases the reactivity of NH3 and NO. X The rate at which the reduction reaction occurs.

[0056] c. Most of the NO is eliminated through a reduction reaction in denitrification reactor 5. X The treated waste gas enters scrubbing tower 7, which contains two spray layers. The lower spray layer primarily cools the gas and absorbs ammonia, while the upper spray layer sprays sodium persulfate solution containing strong oxidizing free radicals that react with unreacted NO in the waste gas. X An oxidation reaction occurs, producing nitrates and sulfates. The treated waste gas, after passing through a demister in scrubbing tower 7 to remove mist, is directly discharged into the atmosphere through the upper waste gas outlet. The remaining waste liquid is discharged from the lower outlet of the scrubbing tower and enters the waste liquid storage tank 8. The reactions occurring in scrubbing tower 7 include:

[0057] S2O8 2- →2SO4 2-

[0058]

[0059] OH - +NO→H + +NO2 -

[0060]

[0061] S2O8 2- +H₂O + SO₂ → 2HSO₄ - +H2SO4

[0062]

[0063] d. The sodium persulfate solution provided by the washing liquid tank 2 enters the heat exchanger 6 to exchange heat with the exhaust gas from the pure ammonia engine, realizing the activation and enhancement process of the sodium persulfate solution. After heating, a large number of oxidizing free radicals are generated in the sodium persulfate solution. The activated sodium persulfate solution is sent to the two-layer atomizing nozzle in the washing tower 7 through pipelines to fully contact and mix with the exhaust gas.

[0064] e.Liquid ammonia in ammonia fuel tank 3 is delivered into heat exchanger 6 through pipeline to exchange heat with waste gas, and the ammonia gas obtained after vaporization is mostly used as fuel for ammonia engine, and a small part of ammonia gas is used as carrier wind in generator of arc plasma generating device 4. In the generator, ammonia gas is excited and ionized into plasma state by high-temperature arc, and a large amount of positive and negative ions, free radicals and electrons are generated.

[0065] The main technical points of the waste gas treatment system of the ammonia fuel engine of the embodiment are as follows:

[0066] The system is composed of engine body 1, plasma generating device 4, denitration reactor 5 and washing tower 7, and can remove most of NOx and NH3 in the exhaust gas of engine body 1. X

[0067] (2) In the denitration reactor, NOx in the exhaust gas can react with ionized ammonia gas to generate N2 without catalyst, reducing the use of catalyst. X

[0068] (3) Plasma generating device 4 has the advantages of concentrated arc energy, high temperature and good electrical conductivity, which can effectively ionize ammonia gas into plasma, increase the mutual collision between substances, strengthen and accelerate the reaction rate of NOx reduction to N2, and improve the reaction conversion rate.

[0069] (4) Water cooling is used in plasma generating device 4 to maintain long-term stable operation of the generator. To reduce the corrosion of cooling water to the engine body and prevent high-temperature fouling, desalted chemical water is used as cooling water

[0070] (5) The strong oxidizing solution used for washing is first passed through second heat exchanger 6 from washing liquid tank 2, and exchanges heat with the exhaust gas discharged from engine body 1 in the heat exchanger, which can activate the washing liquid, improve its oxidation performance, and reduce energy consumption.

[0071] (6) Liquid ammonia is first passed through first heat exchanger 11 from ammonia fuel tank 3, and exchanges heat with the exhaust gas discharged from engine body 1 in the heat exchanger, which realizes vaporization of liquid ammonia and improves the utilization rate of waste heat.

[0072] (7) Two layers of spray layers are arranged inside washing tower 7, and the spray nozzles in the two layers are arranged in a ring shape, which can improve the spray coverage and increase the contact area with the washing liquid.

[0073] (8) The demister is a wave-shaped plate demister made of high-temperature-resistant and corrosion-resistant materials, which can realize steam-water separation.

[0074] (9) The washing liquid used in washing tower 7 is sodium persulfate solution with strong oxidation, which can efficiently remove NOx.​​

[0075] (10) Waste liquid storage tank 8 stores the waste solution containing nitrate, sulfate and ammonia in the storage tank, waiting for the ship to dock for further treatment.

[0076] 7. Effects of the present application:

[0077] The present application has the advantages that the device can simultaneously achieve denitration and ammonia capture, has high removal efficiency, greatly reduces the amount of washing liquid, has small footprint, and is suitable for use in narrow spaces on a ship.

[0078] Another advantage is that the plasma generating device 4 using ammonia gas as the carrier wind ionizes the ammonia gas into a plasma state to form a plasma torch, which contains a large number of positive and negative ions, free radicals and electrons, which can increase the mutual collision between substances, strengthen and accelerate the reaction rate of NOx reduction to N2, and improve the reaction conversion rate.

[0079] Another advantage is that the plasma generating device 4 plus the denitration reaction device can achieve rapid and efficient reaction of the reducing agent with NO x without the need for a catalyst, which reduces the installation and regular maintenance and replacement costs of the catalyst, lowers costs, and improves economic benefits.

[0080] Another advantage is that the washing liquid uses a substance with strong oxidizing properties, which can react with the incompletely reacted NO X in the denitration reactor to oxidize it into high-valence nitrogen oxides, ultimately generating nitrate to achieve removal, and a certain amount of ammonia gas exists in the engine body 1 exhaust, which can use the property of ammonia gas that it is easily soluble in water to use the washing liquid to absorb the escaped ammonia gas to prevent ammonia gas from being discharged.

[0081] Another advantage is that the use of engine body 1 exhaust waste heat and washing liquid for heat exchange can achieve the heating and activation of the washing liquid, which not only effectively utilizes engine waste heat, but also generates a large amount of strong oxidizing free radicals during the heating of the washing liquid, increases the oxidation capacity, improves the reaction activity, and enhances the reaction process with NO X .

[0082] Another advantage is that the mixed solution of nitrate, sulfate and ammonia water in the washing tower 7 is stored to avoid direct discharge of the nitrate and sulfate solution and ammonia water into the sea, which can adversely affect the environment.

[0083] The above is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An exhaust treatment system for an ammonia-fueled engine, characterized by, The ammonia fuel engine exhaust treatment system comprises: a denitration reactor (5) comprising an exhaust gas input end for introducing exhaust gas to be treated; a plasma generating device (4) connected to the denitration reactor (5) and configured to provide plasma for denitration to the denitration reactor (5); and a scrubbing tower (7) comprising a shell (12), an exhaust gas inlet provided on the shell (12) and connected to an exhaust gas output end of the denitration reactor (5), and a first spraying component (13) provided in the shell (12) for spraying a scrubbing solution for absorbing ammonia gas, the ammonia fuel engine exhaust treatment system further comprises an ammonia fuel tank (3) connected to the plasma generating device (4) to provide ammonia gas for ionization excitation to the plasma generating device (4), the ammonia fuel engine exhaust treatment system further comprises a first heat exchanger (11) comprising an ammonia fuel flow path and a first exhaust gas flow path in heat exchange with the ammonia fuel flow path, an inlet end of the first exhaust gas flow path being connected to an exhaust port of an engine body (1) of the ammonia fuel engine, an outlet end of the first exhaust gas flow path being connected to the exhaust gas input end of the denitration reactor (5), an inlet end of the ammonia fuel flow path being connected to the ammonia fuel tank (3), and an outlet end of the ammonia fuel flow path being connected to the plasma generating device (4) and the engine body (1) respectively. The plasma generating device (4) comprises an arc plasma generating device.

2. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, The ammonia fuel tank (3) is connected to the engine body (1) of the ammonia fuel engine to provide fuel to the engine body (1).

3. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, The scrubbing tower (7) further comprises a second spraying component (14) provided above the first spraying component (13).

4. The exhaust treatment system of an ammonia fuel engine according to claim 1, characterized by, The first spraying component (13) comprises a plurality of first nozzles, and the second spraying component (14) comprises a plurality of second nozzles, the first nozzles being arranged in a staggered manner with the second nozzles.

5. The exhaust treatment system of an ammonia fuelled engine according to claim 4, characterized in that, The plurality of first nozzles are arranged in a circular shape, and the plurality of second nozzles are arranged in a circular shape.

6. The exhaust treatment system of an ammonia fuelled engine according to claim 5, characterized in that, The ammonia fuel engine exhaust treatment system further comprises a scrubbing solution tank (2) and a second heat exchanger (6) comprising a scrubbing solution flow path and a second exhaust gas flow path in heat exchange with the scrubbing solution flow path, an inlet end of the second exhaust gas flow path being connected to the exhaust port of the engine body (1) of the ammonia fuel engine, an outlet end of the second exhaust gas flow path being connected to the exhaust gas input end of the denitration reactor (5), an inlet end of the scrubbing solution flow path being connected to the scrubbing solution tank (2), and an outlet end of the scrubbing solution flow path being connected to at least one of the first spraying component (13) and the second spraying component (14).

7. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, The scrubbing solution comprises an oxidizing solution or a sodium persulfate solution.

8. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, The plasma generating device (4) comprises a plasma generating device body and a water cooler for cooling the plasma generating device body, the water cooler being used to circulate desalination chemical water.

9. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, The shell (12) of the scrubbing tower (7) is further provided with an outlet for outputting exhaust gas, and a mist eliminator is provided at the outlet.

10. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, The mist eliminator is a wave-shaped plate mist eliminator.

11. The exhaust treatment system of an ammonia fuelled engine according to claim 10, characterized in that, ​ 12. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, A filter and / or drying device connected between the ammonia fuel tank (3) and the plasma generating device (4) is also included.

13. The exhaust treatment system of an ammonia fuelled engine according to claim 1, characterized in that, A compression device and a pressure stabilizing device connected between the ammonia fuel tank (3) and the plasma generating device (4) are also included.

14. An ammonia fuelled engine characterised in that, An exhaust gas treatment system including the ammonia fuel engine according to any one of claims 1 to 13.

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