Integrated injector for ammonia fuel based on hydroxyl-rich combustion-supporting

Abstract

The application aims to provide an ammonia fuel integrated injector based on hydroxyl-rich combustion-supporting, comprising a liquid ammonia supply control module, a liquid ammonia injection control module and a double-fluid injection module. The application designs an electromagnetic actuator structure with a porous valve rod, so that the pressure at the upper end of the control cavity is adjustable, the quick response of the control valve is realized, and the separation of the servo oil circuit and the supply oil circuit is realized. For the injection control of ammonia fuel, a strong magnetic force electromagnetic actuator with a sleeve valve rod is designed, a direct control form of the structure is adopted, and high-response precise injection of double-fluid mixed gas is realized. In addition, the application realizes large-flow injection of ammonia fuel by adopting hydroxyl-rich gas for double-fluid injection, mixing liquid ammonia with gas by the liquid ammonia injection module, and injecting the mixture into the cylinder, and ensures the combustion effect by combustion-supporting of the hydroxyl-rich gas.

Description

Technical Field

[0001] The present invention relates to an engine fuel injector, specifically an ammonia fuel injector. Background Technology

[0002] Ammonia fuel, as one of the zero-carbon alternative fuels, has a mature supply chain and is a major low-carbon alternative energy source, possessing advantages such as high anti-knock properties and carbon-free combustion. However, there are currently no mature ammonia fuel power plants. The main reason limiting its development is the physical and chemical defects of ammonia fuel, such as its high ignition point, low calorific value, and slow flame propagation speed. These defects lead to problems such as low volumetric efficiency and poor combustion performance in ammonia fuel engines, thus restricting its promotion and development.

[0003] Due to the numerous drawbacks of ammonia as a fuel, a high-flow-rate injection scheme, i.e., liquid ammonia supply, is adopted to address the calorific value issue of ammonia fuel. To mitigate the problems of ammonia fuel's high ignition point, slow combustion rate, and difficulty in ignition, a method of blending various fuels to control fuel activity can be employed. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated ammonia fuel injector based on hydroxyl-rich combustion, which enables the supply of high-pressure liquid ammonia fuel at high flow rates and is combined with high-pressure hydroxyl-rich gas for dual-fluid injection, thereby achieving complete combustion of high-flow ammonia fuel through the combustion-supporting properties of hydroxyl-rich gas.

[0005] The objective of this invention is achieved as follows:

[0006] This invention is based on an integrated ammonia fuel injector with hydroxyl-rich combustion support, characterized by: comprising, from top to bottom, an oil inlet fastening cap, a pressure accumulator wall, a liquid ammonia supply control module, a liquid ammonia injection control module, and a dual-fluid injection module; a servo oil inlet is provided in the oil inlet fastening cap; the pressure accumulator wall is respectively provided with a servo oil pressure accumulator, a liquid ammonia pressure accumulator, and an injector ammonia inlet; the servo oil pressure accumulator is connected to the servo oil inlet; and the liquid ammonia pressure accumulator is connected to the injector ammonia inlet.

[0007] The liquid ammonia supply control module includes an upper supply valve block, a lower supply valve block, a supply electromagnet, a supply armature, an oil inlet slide rod, a needle valve body, and a multi-hole control valve stem. The upper supply valve block is installed between the accumulator wall and the lower supply valve block. The supply electromagnet is located inside the accumulator wall, and the supply armature is located inside the upper supply valve block. A multi-hole control valve stem is located below the supply armature. The oil inlet slide rod passes sequentially through the supply electromagnet, the supply armature, and the multi-hole control valve stem. The oil inlet slide rod is hollow, and an oil inlet is provided inside the accumulator wall. The oil inlet connects to the servo oil accumulator chamber and the oil inlet slide rod, respectively. The multi-hole control valve stem contains... The system includes an oil inlet hole (No. 1), an oil inlet hole (No. 2), an oil inlet hole (No. 3), an oil outlet hole (No. 1), and an oil outlet hole (No. 2). The No. 1 oil inlet hole is connected to the oil inlet slide rod, the No. 2 oil inlet hole is connected to the No. 3 oil outlet hole, and the No. 3 oil inlet hole is connected to the No. 1 oil outlet hole. A release spring is installed in the supply electromagnet and is sleeved on the outside of the oil inlet slide rod. The needle valve body is installed in the supply lower valve block. A needle valve control chamber is formed between the needle valve body and the multi-hole control valve rod above it. A needle valve spring is installed in the needle valve control chamber. The lower end of the needle valve body forms a supply control chamber, which is connected to the liquid ammonia accumulator chamber.

[0008] The present invention may also include:

[0009] 1. The liquid ammonia injection control module includes an upper injection valve block, a lower injection valve block, a powerful electromagnet, an injection armature, an ammonia inlet slide rod, a sleeve-type ammonia inlet control valve rod, and an ammonia inlet block. The upper injection valve block and the lower injection valve block are arranged from top to bottom. The powerful electromagnet is installed in the upper injection valve block, and the injection armature and the ammonia inlet block are installed in the lower injection valve block. An injection coil is installed in the powerful electromagnet. The ammonia inlet slide rod passes through the powerful electromagnet and the injection armature in sequence and enters the ammonia inlet block. The middle part of the ammonia inlet slide rod is a hollow ammonia inlet. A sleeve-type ammonia inlet control valve rod is sleeved on the outside of the ammonia inlet slide rod located below the powerful electromagnet. A compression-type return spring is sleeved on the outside of the sleeve-type ammonia inlet control valve rod between the injection armature and the ammonia inlet block. The ammonia inlet block is provided with an ammonia storage chamber, a first ammonia outlet hole, and a second ammonia outlet hole. The first ammonia outlet hole is connected to the ammonia inlet and the ammonia storage chamber, and the second ammonia outlet hole is connected to the ammonia inlet and the ammonia storage chamber, respectively.

[0010] 2. The dual-fluid injection module includes a nozzle body and an inner conical annular valve stem. The inner conical annular valve stem is installed inside the nozzle body. The inner conical annular valve stem and the nozzle body form a mixing chamber. The liquid ammonia supply control module is provided with a hydroxyl-rich gas inlet. The mixing chamber is connected to the hydroxyl-rich gas inlet and the ammonia inlet.

[0011] 3. The hydroxyl-rich gas inlet is connected to a variable intake control connector structure. The variable intake control connector structure includes a housing and a valve body. The valve body is installed in the housing and has an intake passage. The intake passage has an intake branch one and an intake branch two. Intake branch one is connected to intake valve number one, and intake branch two is connected to intake valve number two.

[0012] 4. When the servo oil enters the liquid ammonia supply control module through the servo oil accumulator chamber, it enters the solenoid valve oil circuit through the inlet. When the solenoid valve is not energized, the servo oil enters the multi-hole control valve stem through the outlet of the inlet slide bar, passing through its No. 1, No. 2, and No. 3 inlets, and then through the No. 1 and No. 2 outlets of the control valve stem to fill the needle valve control chamber. At this time, the oil pressure in the needle valve control chamber increases, acting on the needle valve body through the needle valve spring. This pressure is equivalent to the pressure exerted on the needle valve body through the inclined surface at the lower end of the needle valve body, keeping the needle valve stationary and not supplying liquid ammonia. When the solenoid valve is energized, the supply coil is connected to the power supply. The flow generates electromagnetic force that acts on the supply armature, which is connected to the multi-hole control valve stem. Under the action of electromagnetic force, the multi-hole control valve stem overcomes the elastic force of the relaxation return spring and moves upward. At this time, the No. 1, No. 2, and No. 3 oil inlets of the multi-hole control valve stem are disconnected from the oil outlet of the oil inlet slide rod and connected to the large-diameter return oil hole located in the injector body. At this time, the oil inlet and the servo oil in the needle valve control chamber are discharged through the No. 1 and No. 2 oil outlets of the control valve stem. The pressure in the needle valve control chamber decreases, and the pressure of the liquid ammonia in the oil supply control chamber acting on the needle valve body is greater than the resultant force of the pressure in the needle valve control chamber and the elastic force of the needle valve spring. The needle valve body completes the upward movement, and the liquid ammonia supply process is completed.

[0013] 5. When liquid ammonia enters the liquid ammonia injection control module through the liquid ammonia supply control module, it enters through the ammonia inlet, expands through the first and second ammonia outlets into the ammonia storage chamber within the ammonia inlet block, and is then ejected through the liquid ammonia nozzle. When the solenoid valve is not energized, the injection armature and the sleeve-type control valve stem remain stationary under the action of the compression return spring. The sleeve-type control valve stem is connected to the inner cone-shaped annular valve stem, which also remains stationary, maintaining a seal with the nozzle body. The liquid ammonia expands and is ejected through the liquid ammonia nozzle, entering the mixing chamber to react with the hydroxyl-rich gas within. The mixture forms a two-fluid gas mixture. When the solenoid valve is energized, the injection coil is connected to the current, and the strong magnetic electromagnet generates an electromagnetic force that acts on the injection armature. The current flowing through this point is in the opposite direction to the previous current, and the force acting on the injection armature is downward. The injection armature drives the sleeve-type control valve stem to move downward against the spring force of the compression return spring. The ammonia outlet ports 1 and 2 are disconnected from the sleeve-type control valve stem and the ammonia inlet block channel, stopping the supply of liquid ammonia. This pushes the inner cone-shaped annular valve stem downward, separating it from the nozzle body, and the two-fluid gas mixture is ejected, completing the two-fluid injection of a large flow of ammonia fuel.

[0014] The advantages of this invention are:

[0015] 1. The fuel injection of this invention adopts a direct control method with a strong magnetic electromagnetic actuator with a sleeve-type valve stem, so as to achieve high-response and precise injection of two-fluid mixture gas.

[0016] 2. This invention employs an electromagnetic actuator structure with a multi-hole valve stem, which makes the pressure at the upper end of the control chamber adjustable, thereby achieving rapid response of the control valve and separation of the servo oil circuit and the supply oil circuit.

[0017] 3. This invention uses hydroxyl-rich gas for dual-fluid injection, with a liquid ammonia injection module mixing liquid ammonia with the gas and injecting it into the cylinder, to achieve high-flow-rate injection of ammonia fuel. The hydroxyl-rich gas also aids combustion, ensuring combustion.

[0018] 4. The hydroxyl-rich gas during the injection process facilitates thermal management design during the supply process, enabling ammonia fuel to be recharged and mitigating the negative impact of the high latent heat of vaporization of ammonia fuel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 A schematic diagram of the liquid ammonia supply control module;

[0021] Figure 3 A schematic diagram of a multi-hole control valve stem structure;

[0022] Figure 4 This is a schematic diagram of the liquid ammonia injection control module.

[0023] Figure 5 This is a schematic diagram of the dual-fluid jet module structure;

[0024] Figure 6 This is a schematic diagram of the variable intake control connector structure;

[0025] Figure 7 This is an assembly diagram for assembling the variable intake joint.

[0026] Figure reference numerals: 1. Ammonia inlet for injector; 2. Liquid ammonia accumulator chamber; 3. Oil inlet fastening cap; 4. Servo oil inlet; 5. Servo oil accumulator chamber; 6. Liquid ammonia supply control module; 7. Hydroxyl gas inlet; 8. Liquid ammonia injection control module; 9. Dual-fluid injection module; 10. Oil inlet; 11. Supply electromagnet; 12. Oil inlet slide bar; 13. Needle valve rod; 14. Supply control chamber; 15. Supply coil; 16. Supply armature; 17. Multi-hole control valve rod; 18. Needle valve control chamber; 19. Needle valve spring; 20. Relaxing return spring; 21. No. 1 oil inlet; 22. No. 2 oil inlet. Oil inlet 22; No. 3 oil inlet 23; No. 1 oil outlet 24; No. 2 oil outlet 25; Strong magnetic electromagnet 26; Injection coil 27; Injection armature 28; No. 1 ammonia outlet 29; Liquid ammonia nozzle 30; Ammonia inlet slide bar 31; Sleeve-type ammonia inlet control valve stem 32; Compression-type return spring 33; No. 2 ammonia outlet 34; Ammonia inlet block 35; Ammonia storage chamber 36; Ammonia inlet 37; Inner cone type annular valve stem 38; Mixing chamber 39; Nozzle body 40; No. 1 air inlet valve 41; No. 2 air inlet valve 42; Air inlet duct 43; Outer shell 44; Valve body 45. Detailed Implementation

[0027] The invention will now be described in more detail with reference to the accompanying drawings:

[0028] Combination Figure 1-7 , Figure 1 This is a schematic diagram of the overall structure of the present invention. Based on a hydroxyl-rich ammonia fuel integrated injector, it includes an ammonia inlet 1, an oil inlet fastening cap 3, and a servo oil inlet 4. From top to bottom, the injector body is arranged with a servo oil accumulator chamber 5, a liquid ammonia accumulator chamber 2, and a liquid ammonia supply control module 6. The liquid ammonia supply control module includes an electromagnetic actuator and a needle valve control assembly, a hydroxyl-rich gas inlet 7 and an inlet pipeline, and a liquid ammonia injection control module 8. The liquid ammonia injection control module includes a strong magnetic electromagnetic actuator and a liquid ammonia injection assembly, and a dual-fluid injection module 9.

[0029] Figure 2 This is a schematic diagram of the liquid ammonia supply control module, which includes an electromagnetic actuator and a supply assembly. The electromagnetic actuator includes an upper oil inlet 10, an electromagnet 11, an oil inlet slide rod 12, a needle valve rod 13, a supply control chamber 14, a coil 15, an armature 16, a multi-hole control valve rod 17, a needle valve control chamber 18, a needle valve spring 19, and a release spring 20. This design allows for the separation of the liquid ammonia supply path from the servo control oil path.

[0030] Figure 3 A schematic diagram of the multi-hole control valve stem structure for the liquid ammonia supply control module, including No. 1 oil inlet 21, No. 2 oil inlet 22, No. 3 oil inlet 23, No. 1 oil outlet 24, and No. 2 oil outlet 25.

[0031] Figure 4This is a schematic diagram of the liquid ammonia injection control module, which includes a strong magnetic electromagnet 26, a coil 27, an armature 28, a first ammonia outlet 29, a liquid ammonia nozzle 30, an ammonia inlet slide rod 31, a sleeve-type ammonia inlet control valve rod 32, a compression-type return spring 33, a second ammonia outlet 34, an ammonia inlet block 35, an ammonia storage chamber 36, and an ammonia inlet 37.

[0032] Figure 5 The diagram shows the structure of the dual-fluid injection module, which includes an inner cone-shaped annular valve stem 38, a mixing chamber 39, and a nozzle body 40. This structure ensures sealing while giving the injector the advantage of variable annular opening, allowing the fuel and air to mix fully and promote complete combustion.

[0033] Figure 6 This is a schematic diagram of a variable intake control connector, which includes an intake valve 41, an intake valve 42, an intake passage 43, a valve body 45, and a housing 44. This structure can be used with commonly used electromagnetic actuators to control the two intake valves, thereby completing the intake control.

[0034] Liquid ammonia fuel enters the accumulator chamber 2 through ammonia inlet 1, which serves to stabilize the pressure. Because ammonia fuel has a low calorific value, a large quantity of liquid ammonia is required, making stable supply pressure crucial for the injection of liquid ammonia. After entering the accumulator chamber 2, the liquid ammonia is supplied downwards via the ammonia inlet path. Figure 2 It can be seen that the liquid ammonia then enters the supply control chamber 14 to await entry into the liquid ammonia injection control module 8. The control oil of the liquid ammonia supply control module 6 enters the servo oil accumulator chamber 5 of the fuel injector through the servo oil inlet 4, and then enters the liquid ammonia supply control module 6. After entering the liquid ammonia injection control module 8, the liquid ammonia is... Figure 4 It can be seen that the ammonia enters the dual-fluid injection module 9 through the ammonia storage chamber 36 and the liquid ammonia nozzle 30, and then completes the injection.

[0035] The specific working principle of the spraying process is as follows:

[0036] Hydroxyl-rich gas enters the injector through hydroxyl-rich gas inlet 7, which is a one-way inlet and acts as a one-way valve. When the supply pressure of the hydroxyl-rich gas exceeds the spring preload of the one-way valve, the cone valve opens against the spring force, allowing the hydroxyl-rich gas to enter the injector. When the pressure at the one-way inlet is low, the cone valve closes, also sealing the hydroxyl-rich gas within the system. After entering the injector, the hydroxyl-rich gas passes through the inlet channel and is stored in the mixing chamber 39.

[0037] When the servo oil enters the liquid ammonia supply control module 6 through the servo oil accumulator chamber 5, it enters the solenoid valve oil circuit through the oil inlet 10. When the solenoid valve is not energized, the servo oil enters the multi-hole control valve stem 17 through the oil outlet of the oil inlet slide 12, and then enters the control valve stem through its first oil inlet 21, second oil inlet 22, and third oil inlet 23. Finally, it fills the needle valve control chamber 18 with oil through the first oil outlet 24 and second oil outlet 25. At this time, the oil pressure in the needle valve control chamber 18 increases, acting on the needle valve body 13 through the needle valve spring 19. This pressure is equivalent to the pressure exerted on the needle valve body 13 by the pressure supplied to the control chamber 14 through the inclined surface at the lower end of the needle valve body 13. The needle valve remains stationary and does not supply liquid ammonia. When the solenoid valve is energized, the coil 11 is connected to the current, generating an electromagnetic force that acts on the armature 16. The armature 16 is connected to the multi-hole control valve stem 17. Under the action of the electromagnetic force, the multi-hole control valve stem overcomes the elastic force of the relaxation return spring 20 and moves upward. At this time, the first oil inlet hole 21, the second oil inlet hole 22, and the third oil inlet hole 23 of the multi-hole control valve stem are disconnected from the oil outlet hole of the oil inlet slide rod and connected to the large-diameter return oil hole located in the injector body. At this time, the oil inlet and the servo oil in the needle valve control chamber 18 are quickly discharged through the first oil outlet hole 24 and the second oil outlet hole 25 of the control valve stem. The pressure in the needle valve control chamber 18 decreases. At this time, the pressure of the liquid ammonia in the oil supply control chamber 14 acting on the needle valve body 13 is greater than the resultant force of the pressure in the needle valve control chamber and the elastic force of the needle valve spring. The needle valve completes the upward movement, and the liquid ammonia supply process is completed.

[0038] When liquid ammonia enters the liquid ammonia injection control module 9 through the liquid ammonia supply control module 6, it enters this module through the ammonia inlet 37, expands through the ammonia outlet 29 and the ammonia outlet 34 into the ammonia storage chamber 36 in the ammonia inlet block 35, and is then sprayed out through the liquid ammonia nozzle 30. When the solenoid valve is not energized, the armature 28 and the sleeve-type control valve stem 32 remain stationary under the action of the compression return spring 33. The sleeve-type control valve stem 32 is connected to the inner cone-type annular valve stem 38, which also remains stationary and sealed with the nozzle body 40. The liquid ammonia expands and is sprayed out through the liquid ammonia nozzle 30. After expansion, the liquid ammonia enters the mixing chamber 39 and mixes with the hydroxyl-rich gas in the mixing chamber 39 to form a two-fluid mixed gas. When the solenoid valve is energized, current flows into coil 27, and electromagnet 26 generates electromagnetic force acting on armature 28. The current flowing through here is in the opposite direction to the current mentioned earlier, so the force acting on armature 28 here is a downward thrust. Armature 28 drives sleeve-type control valve stem 32 to move downward against the spring force of compression-type return spring 33. At this time, the ammonia outlet 29 and ammonia outlet 34 are disconnected from the channels of sleeve-type control valve stem 32 and ammonia inlet block 35, stopping the supply of liquid ammonia. At the same time, it pushes the inner cone-type annular valve stem 38 downward, separating it from the nozzle body 40, and the dual-fluid mixed gas is sprayed out, completing the dual-fluid injection of large-flow ammonia fuel.

[0039] After assembling the variable intake control connector, hydroxyl-rich gas intake control can be achieved, and thermal management design can be carried out for hydroxyl-rich gas. For example, dual intakes before the variable intake control connector can be used to perform different levels of thermal management and overheat control. The variable intake control connector can also be used to premix hydroxyl-rich gas mixtures under different thermal management levels.

[0040] As described above, this invention, through the design of an electromagnetic actuator structure with a multi-hole valve stem, enables adjustable pressure at the upper end of the control chamber, achieving rapid response of the control valve and separation of the servo oil circuit and the supply oil circuit. For ammonia fuel injection control, a strong magnetic electromagnetic actuator with a sleeve-type valve stem is designed. This direct control method achieves high-response, precise injection of the two-fluid mixture. Furthermore, this invention employs hydroxyl-rich gas for two-fluid injection. A liquid ammonia injection module mixes the liquid ammonia with the gas and injects it into the cylinder, achieving high-flow-rate ammonia fuel injection. The hydroxyl-rich gas aids combustion, ensuring optimal combustion efficiency. Simultaneously, the hydroxyl-rich gas design in the two-fluid fuel injection process facilitates thermal management during the supply process. The hydroxyl-rich gas can be used for both overheat control and concentration control, enhancing the ammonia fuel while mitigating the negative impacts of its high latent heat of vaporization, providing a feasible technical route for the application of ammonia and other zero-carbon fuels.

Claims

1. An integrated ammonia fuel injector based on hydroxyl-rich combustion-supporting technology, characterized by: The system includes an oil inlet fastening cap (3), a pressure accumulator wall, a liquid ammonia supply control module (6), a liquid ammonia injection control module (8), and a dual-fluid injection module (9) arranged from top to bottom. The oil inlet fastening cap (3) is equipped with a servo oil inlet (4). The pressure accumulator wall is equipped with a servo oil pressure accumulator (5), a liquid ammonia pressure accumulator (2), and an injector ammonia inlet (1). The servo oil pressure accumulator (5) is connected to the servo oil inlet (4), and the liquid ammonia pressure accumulator (2) is connected to the injector ammonia inlet (1). The liquid ammonia supply control module (6) includes an upper supply valve block, a lower supply valve block, a supply electromagnet (11), a supply armature (16), an oil inlet slide rod (12), a needle valve body (13), and a multi-hole control valve rod (17). The upper supply valve block is installed between the accumulator wall and the lower supply valve block. The supply electromagnet (11) is located in the accumulator wall, and the supply armature (16) is located in the upper supply valve block. The multi-hole control valve rod (17) is located below the supply armature (16). The oil inlet slide rod (12) passes through the supply electromagnet (11), the supply armature (16), and the multi-hole control valve rod (17) in sequence. The oil inlet slide rod (12) is hollow. An oil inlet (10) is provided in the accumulator wall. The oil inlet (10) is connected to the servo oil accumulator (5) and the oil inlet slide rod (12) respectively. The multi-hole control valve rod (17) is provided with a first oil inlet (21) and a second oil inlet (22). Oil hole (22), No. 3 oil inlet hole (23), No. 1 oil outlet hole (24), No. 2 oil outlet hole (25), No. 1 oil inlet hole (21) is connected to oil inlet slide rod (12), No. 2 oil inlet hole (22) and No. 3 oil inlet hole (23) respectively, No. 2 oil inlet hole (22) is connected to No. 2 oil outlet hole (25), No. 3 oil inlet hole (23) is connected to No. 1 oil outlet hole (24), a relaxation return spring (20) is installed in the supply electromagnet (11), the relaxation return spring (20) is sleeved on the outside of the oil inlet slide rod (12), the needle valve body (13) is installed in the supply lower valve block, the needle valve body (13) and the multi-hole control valve rod (17) above it form a needle valve control chamber (18), the needle valve control chamber (18) is installed in the needle valve control chamber (18), the lower end of the needle valve body (13) forms a supply control chamber (14), the supply control chamber (14) is connected to the liquid ammonia accumulator chamber (2); The liquid ammonia injection control module (8) includes an upper injection valve block, a lower injection valve block, a powerful electromagnet (26), an injection armature (28), an ammonia inlet slide rod (31), a sleeve-type ammonia inlet control valve rod (32), and an ammonia inlet block (35). The upper and lower injection valve blocks are arranged from top to bottom. The powerful electromagnet (26) is installed in the upper injection valve block, and the injection armature (28) and the ammonia inlet block (35) are installed in the lower injection valve block. An injection coil (27) is installed in the powerful electromagnet (26). The ammonia inlet slide rod (31) passes through the powerful electromagnet (26) and the injection armature (28) in sequence and enters the ammonia inlet block (35). The middle part of the slide bar (31) is a hollow ammonia inlet (37). The ammonia inlet slide bar (31) located below the strong magnetic electromagnet (36) is fitted with a sleeve-type ammonia inlet control valve rod (32). The sleeve-type ammonia inlet control valve rod (32) between the injection armature (28) and the ammonia inlet block (35) is fitted with a compression type return spring (33). The ammonia inlet block (35) is provided with an ammonia storage chamber (36), a first ammonia outlet hole (29) and a second ammonia outlet hole (34). The first ammonia outlet hole (29) is connected to the ammonia inlet (37) and the ammonia storage chamber (36) respectively. The second ammonia outlet hole (34) is connected to the ammonia inlet (37) and the ammonia storage chamber (36) respectively. The dual-fluid injection module (9) includes a nozzle body (40) and an inner conical annular valve stem (38). The inner conical annular valve stem (38) is installed in the nozzle body (40). The inner conical annular valve stem (38) and the nozzle body (40) form a mixing chamber (39). The liquid ammonia supply control module (6) is provided with a hydroxyl-rich gas inlet (7). The mixing chamber (39) is connected to the hydroxyl-rich gas inlet (7) and the ammonia inlet (37).

2. The integrated ammonia fuel injector based on hydroxyl-rich combustion support according to claim 1, characterized in that: The hydroxyl-rich gas inlet (7) is connected to a variable intake control connector structure. The variable intake control connector structure includes a housing (44) and a valve body (45). The valve body (45) is installed in the housing (44). An intake passage (43) is provided in the valve body (45). The intake passage (43) is provided with an intake branch one and an intake branch two. The intake branch one is connected to the first intake valve (41), and the intake branch two is connected to the second intake valve (42).

3. The integrated ammonia fuel injector based on hydroxyl-rich combustion support according to claim 1, characterized in that: When the servo oil enters the liquid ammonia supply control module (6) through the servo oil accumulator (5), it enters the solenoid valve oil circuit through the oil inlet (10). At this time, when the solenoid valve is not energized, the servo oil enters the multi-hole control valve stem (17) through the oil outlet of the oil inlet slide (12), and enters the control valve stem through its first oil inlet (21), second oil inlet (22), and third oil inlet (23). It then completes the oil injection into the needle valve control chamber (18) through the first oil outlet (24) and second oil outlet (25) of the control valve stem. At this time, the oil pressure in the needle valve control chamber (18) increases, and through the needle valve spring (19), it acts on the needle valve body (13), which is equivalent to the pressure of the supply control chamber (14) acting on the needle valve body (13) through the lower inclined surface of the needle valve body (13). The needle valve remains stationary and does not supply liquid ammonia. When the solenoid valve is energized, the supply coil (15) is connected to the current and generates electricity. Magnetic force acts on the supply armature (16), which is connected to the multi-hole control valve stem (17). Under the action of electromagnetic force, the multi-hole control valve stem (17) overcomes the elastic force of the relaxation return spring (20) and moves upward. At this time, the first oil inlet (21), the second oil inlet (22), and the third oil inlet (23) of the multi-hole control valve stem (17) are disconnected from the oil outlet of the oil inlet slide (12) and connected to the large-diameter return oil hole located in the injector body. At this time, the oil inlet and the servo oil in the needle valve control chamber (18) are discharged through the first oil outlet (24) and the second oil outlet (25) of the control valve stem. The pressure in the needle valve control chamber (18) decreases, and the pressure of the liquid ammonia in the oil supply control chamber (14) acting on the needle valve body (13) is greater than the combined force of the pressure in the needle valve control chamber (18) and the elastic force of the needle valve spring (19). The needle valve body (13) completes the upward movement, and the liquid ammonia completes the supply process.

4. The integrated ammonia fuel injector based on hydroxyl-rich combustion support according to claim 1, characterized in that: When liquid ammonia enters the liquid ammonia injection control module (9) through the liquid ammonia supply control module (6), the liquid ammonia enters through the ammonia inlet (37), and then enters the ammonia storage chamber (36) in the ammonia inlet block (35) through the first ammonia outlet (29) and the second ammonia outlet (34) to expand, and is then sprayed out through the liquid ammonia nozzle (30); when the solenoid valve is not energized, the injection armature (28) and the sleeve-type control valve rod (32) remain stationary under the action of the compression return spring (33), and the sleeve-type control valve rod (32) is connected to the inner cone-type annular valve rod (38). At this time, the inner cone-type annular valve rod (38) also remains stationary and is sealed with the nozzle body (40). The liquid ammonia expands and is sprayed out through the liquid ammonia nozzle (30), and after expansion, the liquid ammonia enters the mixing chamber (39) and is sprayed out through the mixing chamber (39). The hydroxyl-rich gas is mixed to form a two-fluid mixture. When the solenoid valve is energized, the injection coil (27) is connected to the current, and the strong magnetic electromagnet (26) generates electromagnetic force to act on the injection armature (28). The current here is opposite to the previous current, and the force acting on the injection armature (28) is downward. The injection armature (28) drives the sleeve-type control valve rod (32) to overcome the spring force of the compression reset spring (33) and move downward. The first ammonia outlet (29) and the second ammonia outlet (34) are disconnected from the sleeve-type control valve rod (32) and the ammonia inlet block (35), the liquid ammonia supply is stopped, and the inner cone-type annular valve rod (38) is pushed downward to separate from the nozzle body (40). The two-fluid mixture is sprayed out, and the two-fluid injection of large flow ammonia fuel is completed.

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