An ammonia fuel supply system for an ammonia internal combustion engine

Abstract

The application discloses an ammonia fuel supply system for an ammonia internal combustion engine, which comprises a liquid ammonia supply assembly, an ammonia injection assembly and a pumping assembly, wherein the pumping assembly comprises a liquid ammonia pump which is provided with a liquid ammonia pressurizing cavity and a cooling expansion cavity in heat exchange relationship with an interwall, the liquid ammonia pressurizing cavity is provided with a liquid ammonia inlet and a liquid ammonia outlet, the liquid ammonia inlet is connected with the liquid ammonia supply assembly, the liquid ammonia outlet is connected with the ammonia injection assembly, the cooling expansion cavity is provided with an expansion inlet and an expansion outlet, and the expansion inlet is connected with the liquid ammonia supply assembly through an expansion valve. The application uses a part of liquid ammonia as a refrigerant, can inject normal-temperature ammonia, does not need to heat insulate the liquid ammonia tank, and can adopt a single-stage pump scheme, accurately adjusts the liquid supply amount, does not need to return oil, and is simple in system, low in cost and high in efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ammonia internal combustion engine liquid ammonia supply, in particular to an ammonia fuel supply system for ammonia internal combustion engine. BACKGROUND

[0002] The ammonia internal combustion engine is still in the research stage, especially the in-cylinder direct injection liquid ammonia supply system. In some known research and application examples, a two-stage pressurization scheme is generally adopted to realize pumping of low-temperature liquid ammonia, that is, the ammonia liquid in the ammonia tank is delivered to the second-stage ammonia pump after being pressurized by the first-stage ammonia pump, and the second-stage ammonia pump is pressurized again to supply the engine. A buffer device needs to be added between the first-stage pump and the second-stage pump, and ammonia liquid needs to be returned after the second-stage pump. Since the operating temperature of the ammonia pump is relatively high, only low-temperature ammonia can be delivered to avoid gasification of the liquid ammonia. Therefore, the existing liquid ammonia supply system has the following problems: there is a risk of gas binding, only low-temperature ammonia can be delivered, the overall volume is large, the cost is high, and in addition, when the working load of the ammonia internal combustion engine changes greatly, the load changes frequently, and the liquid supply pressure needs to be adjusted according to the working condition, the pressure response is poor, and accurate pumping cannot be achieved. SUMMARY

[0003] The present application aims to provide an ammonia fuel supply system for ammonia internal combustion engine, which is suitable for normal temperature liquid ammonia storage and delivery, can effectively avoid gas binding, and achieve accurate pumping, so as to solve one or more technical problems in the prior art and at least provide a beneficial choice or create conditions.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] The present application provides an ammonia fuel supply system for ammonia internal combustion engine, comprising:

[0006] A liquid ammonia supply assembly for supplying liquid ammonia;

[0007] An ammonia injection assembly connected to the ammonia internal combustion engine;

[0008] A pumping assembly comprising a liquid ammonia pump, the liquid ammonia pump being provided with a liquid ammonia pressurizing cavity and a cooling expansion cavity in heat exchange relationship with an interval wall, the liquid ammonia pressurizing cavity being provided with a liquid ammonia inlet and a liquid ammonia outlet, the liquid ammonia inlet being connected to the liquid ammonia supply assembly, the liquid ammonia outlet being connected to the ammonia injection assembly, the cooling expansion cavity being provided with an expansion inlet and an expansion outlet, and the expansion inlet being connected to the liquid ammonia supply assembly through an expansion valve.

[0009] The present application has the following beneficial effects:

[0010] In use, the liquid ammonia supply assembly supplies liquid ammonia to the liquid ammonia pump, the liquid ammonia is divided into two ways in the liquid ammonia pump, one way enters from the liquid ammonia inlet, is pressurized in the liquid ammonia pressurizing chamber to form high-pressure liquid ammonia, and is pumped out from the liquid ammonia outlet to the ammonia injection assembly for injection to supply the ammonia internal combustion engine, the other way is gasified in the cooling expansion chamber through the expansion valve, heat exchange is performed between the liquid ammonia pressurizing chamber and the cooling expansion chamber through the partition wall therebetween, the temperature of the liquid ammonia pressurizing chamber is reduced, gasification of the liquid ammonia is prevented, normal work of the pump to generate pressure is ensured, the liquid ammonia pump accurately pumps liquid ammonia to the internal combustion engine according to demand, and no backflow is needed, the application uses part of the liquid ammonia as a refrigerant, and cooling of the liquid ammonia pump is realized by the large ammonia gasification latent heat, normal temperature liquid ammonia storage and transportation are suitable, and accurate pumping can be effectively avoided.

[0011] As a further improvement of the above technical solution, the ammonia fuel supply system further comprises an air intake assembly connected with the ammonia internal combustion engine, and the expansion outlet is connected with the air intake assembly.

[0012] As a further improvement of the above technical solution, the air intake assembly comprises an air intake pipe, a compressor and a throttle valve arranged in the air intake pipe in sequence, and the air intake pipe is provided with at least one first ammonia access point connected with the expansion outlet.

[0013] As a further improvement of the above technical solution, the ammonia fuel supply system further comprises an exhaust assembly connected with the ammonia internal combustion engine, and the expansion outlet is connected with the exhaust assembly.

[0014] As a further improvement of the above technical solution, the exhaust assembly comprises an exhaust pipe and an exhaust gas processor arranged in the exhaust pipe, and the exhaust gas processor is provided with a second ammonia access point connected with the expansion outlet.

[0015] As a further improvement of the above technical solution, the liquid ammonia pump comprises a pump head and a piston body, the pump head is provided with a piston cavity, the piston body is slidingly arranged in the piston cavity to form the liquid ammonia pressurizing chamber, and the cooling expansion chamber is formed in the pump head.

[0016] As a further improvement of the above technical solution, the liquid ammonia outlet is provided with a check valve and a pressure relief valve arranged in parallel, the liquid ammonia inlet is provided with a liquid inlet electromagnetic valve, the flow direction of the check valve is from the liquid ammonia pressurizing chamber to the ammonia injection assembly, the check valve is configured to be opened when the pressure on the inlet side of the check valve is greater than a first preset value to connect the liquid ammonia outlet with the ammonia injection assembly, the pressure relief valve is configured to be opened when the pressure on the outlet side of the check valve is greater than a second preset value to connect the ammonia injection assembly with the liquid ammonia pressurizing chamber and communicate with the liquid ammonia inlet when the liquid inlet electromagnetic valve is opened.

[0017] As a further improvement of the above technical solution, the liquid ammonia supply assembly comprises a liquid ammonia tank, the liquid ammonia tank is provided with a liquid outlet and a pressurizing port, and the liquid outlet is connected with the liquid ammonia inlet.

[0018] As a further improvement of the above technical solution, the liquid outlet is connected with an ammonia filter.

[0019] As a further improvement of the above technical solution, the liquid ammonia inlet is connected with a gas release port, and the gas release port is provided with a gas release valve.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 is a structure schematic view of an embodiment of the ammonia fuel supply system provided by the present application;

[0023] Figure 2 is a partial schematic view of an embodiment of the liquid ammonia pump provided by the present application;

[0024] LIST OF REFERENCE NUMBERS

[0025] Liquid ammonia supply assembly 100; liquid ammonia tank 110; liquid outlet 111; pressurizing port 112; ammonia filter 120;

[0026] Ammonia injection assembly 200;

[0027] Ammonia internal combustion engine 300;

[0028] Liquid ammonia pump 400; liquid ammonia pressurizing cavity 410; liquid ammonia inlet 411; liquid inlet electromagnetic valve 4111; liquid ammonia outlet 412; cooling and expansion cavity 420; expansion inlet 421; expansion outlet 422; expansion valve 430; pump head 440; piston cavity 441; piston body 450; one-way valve 460; pressure relief valve 470;

[0029] Intake assembly 500; intake pipe 510; first ammonia access point 511; air compressor 520; throttle valve 530;

[0030] Exhaust assembly 600; exhaust pipe 610; turbocharger 611;

[0031] Exhaust gas processor 620; second ammonia access point 621;

[0032] Ammonia internal combustion engine 300. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application will be described in detail in this part, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part of the specification with figures, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0034] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0035] In the description of the present application, if the word such as "several" is described, the meaning is one or more, the meaning of more than two, greater than, less than, more than, etc. is not included in the number, above, below, within, etc. is understood to include the number.

[0036] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0037] The ammonia internal combustion engine 300 is still in the research stage, especially the in-cylinder direct injection liquid ammonia supply system. In some known research and application examples, a two-stage pressurization scheme is usually adopted, that is, the ammonia liquid in the ammonia tank is pressurized by a first-stage ammonia pump and then delivered to a second-stage ammonia pump, and the second-stage ammonia pump is pressurized again to supply the engine. A buffer device needs to be added between the first-stage pump and the second-stage pump, or ammonia liquid needs to be returned after the second-stage pump, and only low-temperature ammonia can be delivered. In order to ensure the low temperature of ammonia, it is necessary to avoid the increase of the storage temperature of ammonia through an adiabatic storage tank, a buffer tank and the like. In the marine field, the space is relatively spacious, there is high-voltage electricity, and the engine operating condition range is narrow, so a certain application can be obtained, but in the field of road vehicles, engineering machinery and the like, the space is small, the cost is sensitive, and the engine working load changes greatly, so it is not very suitable.

[0038] It can be seen that the existing ammonia supply system has the following problems: complex technology, large volume, low efficiency, high cost, and usually only constant pressure and low-temperature ammonia supply. In addition, if the ammonia internal combustion engine 300 has a large working load variation, frequent load variation, needs to adjust the liquid supply pressure according to the working condition, the pressure response is poor, and there is a risk of gas binding at a small flow.

[0039] The present application provides an ammonia fuel supply system for an ammonia internal combustion engine 300 to solve the above problems, specifically, as shown in Figure 1 The ammonia fuel supply system of the embodiment of the present application comprises a liquid ammonia supply assembly 100, an ammonia injection assembly 200 and a pumping assembly.

[0040] The liquid ammonia supply assembly 100 is used for supplying liquid ammonia, and the liquid ammonia supply assembly 100 of the embodiment of the present application comprises a liquid ammonia tank 110, which is used for storing liquid ammonia, and in some other embodiments, other containers can be used to store liquid ammonia, the liquid ammonia tank 110 has certain heat insulation performance, and the tank body does not need to be heat insulated, and the liquid ammonia tank 110 can meet the requirement that the temperature of the ammonia in the tank is not obviously increased under the direct sunlight. At normal temperature, the gas-liquid two-phase coexists in the ammonia tank, and the pressure is usually about 10 bar.

[0041] The liquid ammonia tank 110 is provided with a liquid outlet 111 and a pressurizing port 112, the liquid outlet 111 is used for outputting liquid ammonia, and the liquid outlet 111 is arranged at the bottom of the liquid ammonia tank 110; the liquid ammonia in the tank flows to the liquid supply pipeline under the action of the self-pressure of the liquid ammonia, and in some embodiments, an auxiliary liquid suction pump can be installed, and the primary pump is not necessary.

[0042] In the cold region, the ammonia gas or inert gas (nitrogen) is filled into the liquid ammonia tank 110 through the pressurizing port 112, so that the pressure in the tank meets the use requirement, and the pumping of the ammonia and the cooling of the ammonia can be effectively ensured, and therefore, the pump for the liquid outlet of the liquid ammonia tank 110 is not necessary.

[0043] The liquid outlet 111 of the embodiment is connected with an ammonia filter 120, and the liquid ammonia is filtered through the ammonia filter 120.

[0044] The ammonia injection assembly 200 is connected with the ammonia internal combustion engine 300 in a matched mode, the ammonia injection assembly 200 is used for realizing the injection of the ammonia in the ammonia internal combustion engine 300, the ammonia injection assembly 200 comprises an ammonia rail and a plurality of injectors, the injectors are connected with the plurality of drive cylinders of the internal combustion engine in a one-to-one correspondence, and the ammonia rail is connected with the plurality of injectors.

[0045] The pumping assembly of the embodiment of the present application comprises a liquid ammonia pump 400, the liquid ammonia pump 400 is provided with a liquid ammonia pressurizing chamber 410 and a cooling expansion chamber 420, the liquid ammonia pressurizing chamber 410 is used for pressurizing the liquid ammonia, the liquid ammonia pressurizing chamber 410 of the embodiment is provided with a liquid ammonia inlet 411 and a liquid ammonia outlet 412, the liquid ammonia inlet 411 is connected with the liquid outlet 111 through the liquid supply pipeline, and the liquid ammonia outlet 412 is connected with the ammonia injection assembly 200 through the pipeline.

[0046] And the cooling expansion cavity 420 has a partition wall heat exchange relationship with the liquid ammonia plenum 410, the cooling expansion cavity 420 is used to cool the liquid ammonia plenum 410, the cooling expansion cavity 420 of the embodiment of the application has an expansion inlet 421 and an expansion outlet 422, the expansion inlet 421 is communicated with the liquid outlet 111 through the expansion valve 430, in use, the liquid ammonia supply assembly 100 supplies liquid ammonia to the liquid ammonia pump 400, the liquid ammonia is divided into two ways in the liquid ammonia pump 400, one way enters from the liquid ammonia inlet 411, is pressurized through the liquid ammonia plenum 410 to form high-pressure liquid ammonia, and then is pumped out from the liquid ammonia outlet 412 to the ammonia injection assembly 200, is injected to the ammonia injection assembly 200, and is used to consume the internal combustion engine 300, the other way is gasified through the expansion valve 430 in the cooling expansion cavity 420, is heat-absorbed, the temperature of the liquid ammonia plenum 410 is reduced through the partition wall heat exchange between the liquid ammonia plenum 410 and the cooling expansion cavity 420, the gasification of the liquid ammonia is ensured, the normal work of the pump is ensured to generate pressure, the liquid ammonia pump 400 is accurately pumped according to requirements and is used to the internal combustion engine, and backflow is not needed, the application uses a part of liquid ammonia as refrigerant, and the characteristics of large ammonia gasification latent heat are used to cool the liquid ammonia pump 400, is suitable for normal temperature liquid ammonia storage and transportation, can effectively avoid gas binding, and realizes accurate pumping.

[0047] As shown in Figure 2 The liquid ammonia pump 400 of the embodiment of the application includes a pump head 440 and a piston body 450, wherein the pump head 440 is provided with a piston cavity 441, the piston body 450 is slidably arranged in the piston cavity 441 to form the above-mentioned liquid ammonia plenum 410, and the cooling expansion cavity 420 is formed in the pump head 440.

[0048] The application utilizes ammonia gasification to cool the pump head 440, eliminates the gasification problem of the pump head 440, is not worried about heat transfer, in some embodiments, the pump can be installed on the body of the ammonia internal combustion engine 300, and then is driven by using the power of the ammonia internal combustion engine 300, and can share a lubricating system.

[0049] In some embodiments, the liquid ammonia pump 400 is an electric control plunger pump, the volume of the liquid ammonia plenum 410 is controlled by an electromagnetic valve to change the flow of compressed liquid, the supply amount is dynamically adjusted according to the requirements of the internal combustion engine, backflow is not needed, the output pressure can reach thousands of bars, and the pressure dynamic response is good.

[0050] The flow of the pump can be adjusted according to requirements, is not limited to the example, and in other some embodiments, heating, gasification, distribution, buffering and the like can be added after the pump according to specific requirements.

[0051] As shown in Figure 2As shown, the liquid ammonia outlet 412 of the embodiment of the present application is provided with a one-way valve 460 and a pressure relief valve 470, the one-way valve 460 and the pressure relief valve 470 are arranged in parallel, and the liquid ammonia inlet 411 is provided with a liquid inlet electromagnetic valve 4111, the liquid inlet electromagnetic valve 4111 is used to control the amount of liquid ammonia entering the liquid ammonia booster chamber 410, when the piston body 450 is descending, the liquid inlet electromagnetic valve 4111 is opened, and when the piston body 450 is ascending, the liquid inlet electromagnetic valve 4111 is controlled according to the liquid ammonia delivery amount to control the closing time point.

[0052] The one-way valve 460 is configured to be opened when the inlet side pressure of the one-way valve 460 is greater than a first preset value to make the liquid ammonia outlet 412 communicate with the ammonia injection assembly 200, during the ascending process of the piston body 450, when the liquid ammonia is pressurized to the first preset value, the one-way valve 460 is opened, the high-pressure ammonia is pumped out, and when the piston body 450 has not reached the set height, the one-way valve 460 is in a closed state, and when the piston body 450 is descending, the liquid ammonia will not flow back through the one-way valve 460, and the suction generated by the descending of the piston body 450 is only used to suck the supplied liquid ammonia.

[0053] The pressure relief valve 470 is configured to be opened when the outlet side pressure of the one-way valve 460 is greater than a second preset value to make the ammonia injection assembly 200 communicate with the liquid ammonia booster chamber 410 and communicate with the liquid ammonia inlet 411 when the liquid inlet electromagnetic valve 4111 is opened. In actual operation, high-pressure liquid ammonia will be periodically pumped into the injector and ammonia rail, and when the pressure of the injector and ammonia rail is too high, if the ammonia continues to be added, the injector or ammonia rail will be damaged. In order to protect the injector and ammonia rail at the rear end, the embodiment of the present application is provided with the pressure relief valve 470, and it can be understood that when the liquid ammonia pressure in the injector and ammonia rail in the internal combustion engine is higher than the second preset value, the pressure relief valve 470 is opened to relieve the liquid ammonia in the injector and ammonia rail, and the relief can be performed to the supply end during the liquid inlet stage.

[0054] In some embodiments, the liquid ammonia inlet 411 is connected with a gas vent, and the gas vent is provided with a gas vent valve, which is used to diffuse and purge through the gas vent during the first filling or maintenance.

[0055] Further, the ammonia fuel supply system further comprises an air inlet assembly 500 connected with the ammonia internal combustion engine 300, the air inlet assembly 500 realizes the air inlet of the ammonia internal combustion engine 300, in order to not produce pollution and waste, the expansion outlet 422 of the embodiment of the present application is connected with the air inlet assembly 500 through a pipeline, and the ammonia cooled by the pump head 440 can be recycled to the air inlet assembly 500 to serve as fuel.

[0056] Specifically, the air intake assembly 500 of the embodiment of the present application comprises an air intake pipe 510, a compressor 520 and a throttle valve 530, the compressor 520 and the throttle valve 530 are sequentially arranged in the air intake pipe 510, the air intake pipe 510 is provided with at least one first ammonia access point 511 connected with the expansion outlet 422, the number and position of the first ammonia access point 511 can be determined according to actual requirements, for example, as shown in the figure, the first ammonia access point 511 is arranged on the upstream side of the compressor 520, and the first ammonia access point 511 is arranged on both the downstream side and the upstream side of the throttle valve 530, the expanded ammonia can be introduced into the air intake pipe 510 from one of the first ammonia access points 511, or simultaneously introduced into the air intake pipe 510 from multiple first ammonia access points 511, and the access position can be selected from the above-mentioned first ammonia access points 511 according to the type of the engine. Figure 1 The first ammonia access point 511 is arranged on the upstream side of the compressor 520, and the first ammonia access point 511 is arranged on both the downstream side and the upstream side of the throttle valve 530, the expanded ammonia can be introduced into the air intake pipe 510 from one of the first ammonia access points 511, or simultaneously introduced into the air intake pipe 510 from multiple first ammonia access points 511, and the access position can be selected from the above-mentioned first ammonia access points 511 according to the type of the engine.

[0057] In addition, the ammonia fuel supply system of the embodiment of the present application further comprises an exhaust assembly 600 connected with the ammonia internal combustion engine 300, the exhaust assembly 600 is used to realize the exhaust of the ammonia internal combustion engine 300, the exhaust assembly 600 of the embodiment of the present application comprises an exhaust pipe 610 and a tail gas processor 620 arranged in the exhaust pipe 610, the tail gas processor 620 is provided with a second ammonia access point 621 connected with the expansion outlet 422, the expansion outlet 422 is connected with the second ammonia access point 621 through a pipeline, and the ammonia cooled by the pump head 440 can be recovered to the tail gas processor 620 to serve as a reactant of nitrogen oxide compounds, so as to reduce pollution emissions.

[0058] Furthermore, the embodiment of the present application realizes the gasification and flow of ammonia according to requirements, and cools the pump chamber without causing pollution and waste.

[0059] The exhaust pipe 610 of the embodiment of the present application is provided with a turbocharger 611, the turbocharger 611 is in driving connection with the compressor 520, and the turbocharger 611 recovers the kinetic energy of the exhaust gas to drive the compressor 520 to operate.

[0060] The opening degree of the expansion valve 430 of the embodiment of the present application can be adjusted and arranged, the expansion valve 430 is controlled to adjust the flow of the cooling ammonia, the temperature of the pump head 440 is controlled to be within a reasonable range, and the emission parameters can also be adjusted.

[0061] Compared with the prior art which needs to use an adiabatic ammonia tank, use a two-stage pump and add low-temperature ammonia, the ammonia fuel supply system of the embodiment of the present application does not need adiabatic, has no one-stage pump, uses normal-temperature ammonia, solves the problem of gas binding, the ammonia pump is arranged flexibly, can be integrated with the engine, the cooling ammonia is effectively used by the engine, and no pollution and energy loss are caused.

[0062] The application simplifies the ammonia fuel supply system design of the ammonia internal combustion engine 300, reduces energy consumption, saves cost, creates favorable conditions for improving system integration and reducing volume, expands the application range of the ammonia internal combustion engine 300, has no low-temperature requirement for filling ammonia, improves the convenience of ammonia transportation and storage, and indirectly reduces the use cost of the ammonia internal combustion engine 300.

[0063] The preferred embodiments of the application are specifically described above, but the application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An ammonia fuel supply system for an ammonia internal combustion engine, characterized by comprising: The system comprises: a liquid ammonia supply assembly (100) for supplying liquid ammonia; an ammonia injection assembly (200) connected to the ammonia internal combustion engine (300); a pumping assembly comprising a liquid ammonia pump (400) provided with a liquid ammonia pressurizing cavity (410) and a cooling expansion cavity (420) in heat exchange relationship with an intermediate wall, the liquid ammonia pressurizing cavity (410) being provided with a liquid ammonia inlet (411) connected to the liquid ammonia supply assembly (100) and a liquid ammonia outlet (412) connected to the ammonia injection assembly (200), the cooling expansion cavity (420) being provided with an expansion inlet (421) and an expansion outlet (422), the expansion inlet (421) being connected to the liquid ammonia supply assembly (100) via an expansion valve (430).

2. The ammonia fuel supply system according to claim 1, wherein: the ammonia fuel supply system further comprises an air intake assembly (500) connected to the ammonia internal combustion engine (300), the expansion outlet (422) being connected to the air intake assembly (500).

3. The ammonia fuel supply system according to claim 2, wherein: the air intake assembly (500) comprises an air intake pipe (510), a compressor (520) and a throttle valve (530) arranged in sequence in the air intake pipe (510), the air intake pipe (510) being provided with at least one first ammonia access point (511) connected to the expansion outlet (422).

4. The ammonia fuel supply system according to claim 1, wherein: the ammonia fuel supply system further comprises an exhaust assembly (600) connected to the ammonia internal combustion engine (300), the expansion outlet (422) being connected to the exhaust assembly (600).

5. The ammonia fuel supply system according to claim 4, wherein: the exhaust assembly (600) comprises an exhaust pipe (610) and an exhaust gas treatment device (620) arranged in the exhaust pipe (610), the exhaust gas treatment device (620) being provided with a second ammonia access point (621) connected to the expansion outlet (422).

6. The ammonia fuel supply system according to claim 1, wherein: the liquid ammonia pump (400) comprises a pump head (440) and a piston body (450), the pump head (440) being provided with a piston cavity (441), the piston body (450) being slidingly arranged in the piston cavity (441) to form the liquid ammonia pressurizing cavity (410), the cooling expansion cavity (420) being formed in the pump head (440).

7. The ammonia fuel supply system according to claim 6, wherein: The liquid ammonia outlet (412) is provided with a check valve (460) and a pressure relief valve (470) arranged in parallel, the liquid ammonia inlet (411) is provided with a liquid inlet electromagnetic valve (4111), the flow direction of the check valve (460) is from the liquid ammonia pressurizing cavity (410) to the ammonia injection assembly (200), the check valve (460) is configured to open when the inlet side pressure of the check valve (460) is greater than a first preset value to connect the liquid ammonia outlet (412) with the ammonia injection assembly (200), the pressure relief valve (470) is configured to open when the outlet side pressure of the check valve (460) is greater than a second preset value to connect the ammonia injection assembly (200) with the liquid ammonia pressurizing cavity (410) and communicate with the liquid ammonia inlet (411) when the liquid inlet electromagnetic valve (4111) is opened.

8. The ammonia fuel supply system according to claim 1, characterized in that: The liquid ammonia supply assembly (100) comprises a liquid ammonia tank (110), the liquid ammonia tank (110) is provided with a liquid outlet (111) and a pressurizing port (112), and the liquid outlet (111) is connected with the liquid ammonia inlet (411).

9. The ammonia fuel supply system according to claim 8, characterized in that: The liquid outlet (111) is connected with an ammonia filter (120).

10. The ammonia fuel supply system according to claim 1, characterized in that: The liquid ammonia inlet (411) is connected with a gas vent, and the gas vent is provided with a gas vent valve.

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