Vehicle-mounted ammonia hydrogen production system

Abstract

The invention discloses a vehicle-mounted ammonia hydrogen production system, and relates to the field of ammonia hydrogen production. In the system, an ammonia supply module is connected with a liquid ammonia gasification module; the liquid ammonia gasification module is connected with the ammonia cracking reaction hydrogen production module through a first gas supply pipeline; the liquid ammonia gasification module is further connected with the engine body through a second gas supply pipeline; the liquid ammonia gasification module is also connected with the cracking gas injection module; the control module is respectively connected with the ammonia supply module, the liquid ammonia gasification module, the first gas supply pipeline, the ammonia cracking reaction hydrogen production module, the cracking gas injection module, the second gas supply pipeline, the first temperature sensor and the second temperature sensor; the liquid ammonia gasification module is provided with a first temperature sensor; the ammonia cracking reaction hydrogen production module is provided with a second temperature sensor; tail gas waste heat of the engine and high-temperature cracking gas of ammonia cracking reaction can be fully utilized, and the advantage of extremely high energy utilization rate is achieved.

Description

Technical Field

[0001] This application relates to the field of ammonia-to-hydrogen production, and in particular to an on-board ammonia-to-hydrogen production system. Background Technology

[0002] With the urgent global demand for clean energy and the continuous development of hydrogen energy technology, ammonia, as a promising hydrogen source, has become a research hotspot for hydrogen production technology. Ammonia-to-hydrogen technology not only enables large-scale hydrogen production, but also utilizes widely available and renewable raw materials, making it environmentally friendly.

[0003] Ammonia (NH3) not only possesses advantages such as high hydrogen content, easy liquefaction, and convenient storage and transportation, but also boasts mature and well-developed production and transportation technologies, large supply volume, and low cost. It is considered one of the most promising and efficient hydrogen energy storage and transportation carriers, and ammonia decomposition hydrogen production technology can effectively solve the problem of difficult hydrogen storage and transportation. However, ammonia decomposition is an endothermic reaction, and traditional ammonia cracking hydrogen production technologies typically use combustion or electric heating for energy supply, resulting in problems such as large equipment size and low energy utilization.

[0004] Currently, most patents for ammonia-hydrogen engines focus on independent ammonia / hydrogen supply and injection. The fuel supply system needs to carry separate ammonia cylinders and high-pressure hydrogen cylinders to supply fuel to the engine. The fuel consumption rate is fast and the refueling frequency is high, resulting in poor economic efficiency when used in heavy-duty commercial vehicles for long-distance transportation.

[0005] The ammonia cracking reaction hydrogen production unit is an important component of the ammonia fuel engine system. The internal working process of this unit is an endothermic expansion reaction, which places high demands on its temperature. Under actual operating conditions, the ammonia cracking reaction hydrogen production unit needs to be controlled within a certain temperature range. Below the target temperature, the conversion efficiency of ammonia to hydrogen is low; above the operating temperature, the catalyst activity within the unit decreases, causing irreversible damage.

[0006] Ammonia fuel has attracted widespread attention because its complete combustion produces only N2 and H2O. However, due to its slow combustion reaction rate and high ignition energy, ammonia cannot be used as a standalone fuel for internal combustion engines. Therefore, various dual-fuel solutions have been proposed, but these require vehicles to simultaneously refuel with two types of fuel (ammonia and other fuels), and necessitate two separate fuel supply and storage systems. This increases the vehicle's weight and cost, complicates the control process, significantly reduces ease of use, and causes inconvenience for users.

[0007] Most existing ammonia-to-hydrogen plants rely solely on external electric heaters as heat sources, a method that consumes a significant amount of electrical energy. Furthermore, the exhaust heat from the ammonia fuel engine system carries away some energy; therefore, failing to utilize this exhaust heat as a heat source reduces the efficiency of the ammonia fuel engine system. Summary of the Invention

[0008] The purpose of this application is to provide an on-board ammonia-to-hydrogen system that can make full use of the exhaust heat of the engine and the high-temperature cracked gas from the ammonia cracking reaction to improve energy utilization.

[0009] To achieve the above objectives, this application provides the following solution:

[0010] In a first aspect, this application provides an on-board ammonia hydrogen production system, including: an ammonia supply module, a liquid ammonia vaporization module, a first gas supply pipeline, an ammonia cracking reaction hydrogen production module, a cracked gas injection module, a second gas supply pipeline, a control module, a first temperature sensor, and a second temperature sensor.

[0011] The ammonia supply module and the liquid ammonia vaporization module are connected; the liquid ammonia vaporization module is connected to the ammonia cracking reaction hydrogen production module through the first gas supply pipeline; the liquid ammonia vaporization module is also connected to the engine body through the second gas supply pipeline; the liquid ammonia vaporization module is also connected to the cracked gas injection module; the control module is connected to the ammonia supply module, the liquid ammonia vaporization module, the first gas supply pipeline, the ammonia cracking reaction hydrogen production module, the cracked gas injection module, the second gas supply pipeline, the first temperature sensor, and the second temperature sensor, respectively.

[0012] The liquid ammonia vaporization module is equipped with the first temperature sensor; the first temperature sensor is used to monitor the temperature of the ammonia vaporization unit.

[0013] The ammonia cracking reaction hydrogen production module is equipped with the second temperature sensor; the second temperature sensor is used to monitor the temperature of the ammonia cracking reaction hydrogen production chamber.

[0014] The control module is used to control the hydrogen production chamber of the ammonia cracking reaction to reach a corresponding target temperature based on the temperature of the hydrogen production chamber of the ammonia cracking reaction, and is also used to control the ammonia gasification unit to reach a corresponding target temperature based on the temperature of the ammonia gasification unit.

[0015] In one embodiment, the ammonia supply module includes: a liquid ammonia tank, a liquid ammonia pump, and a first electrically controlled three-way valve;

[0016] The liquid ammonia tank and the liquid ammonia pump are connected; the liquid ammonia pump is connected to the liquid ammonia vaporization module through the first electrically controlled three-way valve.

[0017] In one embodiment, the liquid ammonia vaporization module includes: an ammonia vaporization unit, a first heating unit, a heat exchanger, and a second electrically controlled three-way valve;

[0018] The ammonia vaporization unit and the heat exchanger are both connected to the first electrically controlled three-way valve; the first heating unit is connected to the ammonia vaporization unit; and the ammonia vaporization unit and the heat exchanger are also connected to the second electrically controlled three-way valve.

[0019] In one embodiment, the first gas supply line includes: a first pressure regulating valve and a first ammonia flow meter;

[0020] One end of the first pressure regulating valve is connected to the first electrically controlled three-way valve; the other end of the first pressure regulating valve is connected to the first ammonia flow meter; the first ammonia flow meter is connected to the control module.

[0021] In one embodiment, the second gas supply line includes: a second pressure regulating valve, a second ammonia flow meter, and an injection valve;

[0022] One end of the second pressure regulating valve is connected to the first electrically controlled three-way valve; the other end of the second pressure regulating valve is connected to the second ammonia flow meter; the second ammonia flow meter is connected to the injection valve; and the injection valve is connected to the control module.

[0023] In one embodiment, the ammonia cracking reaction hydrogen production module includes: an inlet end, an outlet end, an ammonia cracking reaction hydrogen production chamber, and a second heating unit;

[0024] The inlet end is connected to the first ammonia flow meter; the outlet end is connected to the heat exchanger; both the inlet end and the outlet end are located on the ammonia cracking reaction hydrogen production chamber; the second heating unit is connected to the ammonia cracking reaction hydrogen production chamber and the control module respectively.

[0025] In one embodiment, the pyrolysis gas injection module includes: a pyrolysis gas pressure stabilizing tank, a water-cooled radiator, a diaphragm compressor, and an air-cooled radiator;

[0026] The cracked gas pressure stabilizing tank is connected to the heat exchanger and the water-cooled radiator respectively; the water-cooled radiator is connected to the diaphragm compressor; the diaphragm compressor is connected to the air-cooled radiator; and the air-cooled radiator is connected to the engine body.

[0027] In one embodiment, the engine body includes: an ammonia fuel engine, an intake manifold, an exhaust manifold, and nozzles;

[0028] The intake manifold, the exhaust manifold, and the nozzle are all connected to the ammonia fuel engine; the intake manifold is connected to the injection valve; and the nozzle is connected to the air-cooled radiator of the cracked gas injection device.

[0029] In one embodiment, the device further includes a post-processing unit connected to the ammonia cracking reaction hydrogen production chamber.

[0030] In one embodiment, it further includes: an exhaust pipe;

[0031] The exhaust pipe connects to the exhaust manifold, the ammonia cracking reaction hydrogen production chamber, and the after-treatment device.

[0032] According to the specific embodiments provided in this application, this application has the following technical effects:

[0033] This application provides an on-board ammonia-to-hydrogen system, comprising an ammonia supply module, a liquid ammonia vaporization module, a first gas supply pipeline, an ammonia cracking reaction hydrogen production module, a cracked gas injection module, a second gas supply pipeline, a control module, a first temperature sensor, and a second temperature sensor. The system utilizes the high-temperature mixed gas from the ammonia cracking reaction to exchange heat with liquid ammonia from the on-board liquid ammonia tank in a heat exchanger, performing liquid ammonia vaporization and preheating of the gaseous ammonia, thus achieving energy recovery and utilization. The preheated gaseous ammonia is fed into the ammonia cracking reaction hydrogen production device, where, under electric heating and exhaust waste heat heating, it is cracked into nitrogen and hydrogen under the action of a catalyst. After cooling, the cracked gas is pressurized by a diaphragm compressor to provide injection pressure, ultimately achieving high-pressure injection of the engine's ignition fuel and low-pressure injection of the main fuel gas, ammonia. This application can fully utilize the exhaust waste heat of the engine and the high-temperature cracked gas from the ammonia cracking reaction, possessing the advantage of extremely high energy utilization efficiency. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of an on-board ammonia-to-hydrogen system provided in one embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the overall structure of an on-board ammonia-to-hydrogen system provided in one embodiment of this application.

[0037] Reference numerals: 10. Ammonia supply module; 11. Liquid ammonia tank; 12. Liquid ammonia pump; 13. First electrically controlled three-way valve; 20. Liquid ammonia vaporization module; 21. Ammonia vaporization unit; 22. First heating unit; 23. Heat exchanger; 24. Second electrically controlled three-way valve; 30. First gas supply pipeline; 31. First pressure regulating valve; 32. First ammonia flow meter; 40. Ammonia cracking reaction hydrogen production module; 41. Inlet end; 42. Outlet end; 43. Ammonia cracking reaction hydrogen production chamber; 44. Second heating unit; 50. Cracking gas injection module; 51. Cracking gas pressure stabilizing tank; 52. Water-cooled radiator; 53. Diaphragm compressor; 54. Air-cooled radiator; 60. Second gas supply pipeline; 61. Second pressure regulating valve; 62. Second ammonia flow meter; 63. Injection valve; 70. After-treatment device; 80. Exhaust pipe; 90. Control module; 100. Ammonia fuel engine. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Ammonia-to-hydrogen technology: Ammonia-to-hydrogen is based on the catalytic decomposition reaction of ammonia (NH3), with the chemical equation 2NH3→3H2+N2. This process requires high temperature (500℃) and the action of a catalyst (ruthenium-based).

[0041] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, an on-board ammonia-to-hydrogen system is provided, including: an ammonia supply module 10, a liquid ammonia vaporization module 20, a first gas supply pipeline 30, an ammonia cracking reaction hydrogen production module 40, a cracked gas injection module 50, a second gas supply pipeline 60, a control module 90, a first temperature sensor (not shown in the figure) and a second temperature sensor (not shown in the figure).

[0042] This system utilizes the high-temperature mixed gas from ammonia cracking to exchange heat with liquid ammonia from an onboard liquid ammonia tank in a heat exchanger, performing liquid ammonia vaporization and preheating of the gaseous ammonia to achieve energy recovery and utilization. The preheated gaseous ammonia is then fed into an ammonia cracking hydrogen production unit, where, under electric heating and exhaust heat from the engine, it is cracked into nitrogen and hydrogen in the presence of a catalyst. After cooling, the cracked gas is pressurized by a diaphragm compressor to provide injection pressure, ultimately achieving high-pressure injection of the engine's ignition fuel and low-pressure injection of the main fuel, gaseous ammonia. This invention can fully utilize the exhaust heat from the engine and the high-temperature cracked gas from the ammonia cracking reaction, resulting in extremely high energy utilization. Simultaneously, by producing hydrogen online in real time, it reduces the need for a separate hydrogen fuel supply and storage system in the vehicle.

[0043] The ammonia supply module 10 and the liquid ammonia vaporization module 20 are connected; the liquid ammonia vaporization module 20 is connected to the ammonia cracking reaction hydrogen production module 40 through the first gas supply pipeline 30; the liquid ammonia vaporization module 20 is also connected to the engine body through the second gas supply pipeline 60; the liquid ammonia vaporization module 20 is also connected to the cracked gas injection module 50; the control module 90 is connected to the ammonia supply module 10, the liquid ammonia vaporization module 20, the first gas supply pipeline 30, the ammonia cracking reaction hydrogen production module 40, the cracked gas injection module 50, the second gas supply pipeline 60, the first temperature sensor, and the second temperature sensor, respectively.

[0044] In this embodiment, the ammonia supply module 10 includes: a liquid ammonia tank 11 (i.e., Figure 2 The vehicle-mounted liquid ammonia tank, liquid ammonia pump 12, and first electrically controlled three-way valve 13 are included.

[0045] The liquid ammonia tank 11 is connected to the liquid ammonia pump 12; the liquid ammonia pump 12 is connected to the liquid ammonia vaporization module 20 through the first electrically controlled three-way valve 13.

[0046] The liquid ammonia vaporization module 20 is equipped with the first temperature sensor; the first temperature sensor is used to monitor the temperature of the ammonia vaporization unit.

[0047] In this embodiment, the liquid ammonia vaporization module 20 includes: an ammonia vaporization unit 21, a first heating unit 22, a heat exchanger 23, and a second electrically controlled three-way valve 24.

[0048] The ammonia vaporization unit 21 and the heat exchanger 23 are both connected to the first electrically controlled three-way valve 13; the first heating unit 22 is connected to the ammonia vaporization unit 21; the ammonia vaporization unit 21 and the heat exchanger 23 are also both connected to the second electrically controlled three-way valve 24.

[0049] The liquid ammonia vaporization module 20 is connected to the ammonia cracking reaction hydrogen production module 40 through the first gas supply pipeline 30. The ammonia cracking reaction hydrogen production module 40 is equipped with a second temperature sensor to monitor the temperature inside the ammonia cracking reaction hydrogen production chamber 43. The control module 90 heats the ammonia cracking reaction hydrogen production module 40 by heating the second heating unit 44 to reach the target temperature, thereby ensuring the conversion rate of ammonia cracking reaction hydrogen production.

[0050] The liquid ammonia vaporization module 20 is also connected to a second gas supply line 60, which is then connected to the engine body. The second gas supply line 60 is used to ensure the supply of gaseous ammonia fuel required during engine combustion.

[0051] The first gas supply line 30 includes a first pressure regulating valve 31 and a first ammonia flow meter 32. The gas enters the ammonia cracking reaction hydrogen production chamber 43 through the inlet 41 of the ammonia cracking reaction hydrogen production module 40. The main function of the first gas supply line 30 is to control the flow rate and pressure of gaseous ammonia entering the ammonia cracking reaction hydrogen production module 40.

[0052] One end of the first pressure regulating valve 31 is connected to the first electrically controlled three-way valve 13; the other end of the first pressure regulating valve 31 is connected to the first ammonia flow meter 32; the first ammonia flow meter 32 is connected to the control module 90.

[0053] The second gas supply line 60 includes: a second pressure regulating valve 61, a second ammonia flow meter 62, and an injection valve 63.

[0054] One end of the second pressure regulating valve 61 is connected to the first electrically controlled three-way valve 13; the other end of the second pressure regulating valve 61 is connected to the second ammonia flow meter 62; the second ammonia flow meter 62 is connected to the injection valve 63; and the injection valve 63 is connected to the control module 90.

[0055] The ammonia cracking reaction hydrogen production module 40 is equipped with the second temperature sensor; the second temperature sensor is used to monitor the temperature of the ammonia cracking reaction hydrogen production chamber.

[0056] The ammonia cracking reaction hydrogen production module 40 includes: an inlet end 41, an outlet end 42, an ammonia cracking reaction hydrogen production chamber 43, and a second heating unit 44.

[0057] The inlet end 41 is connected to the first ammonia flow meter 32; the outlet end 42 is connected to the heat exchanger 23; both the inlet end 41 and the outlet end 42 are located on the ammonia cracking reaction hydrogen production chamber 43; the second heating unit 44 is connected to the ammonia cracking reaction hydrogen production chamber 43 and the control module 90 respectively.

[0058] The ammonia cracking reaction hydrogen production module 40 is connected to the heat exchanger 23 through the outlet end 42. The high-temperature cracked gas produced by the ammonia cracking reaction hydrogen production module 40 is connected to the heat exchanger 23 through the outlet end 42 and enters the heat exchanger 23 as a heat medium to exchange heat with the liquid ammonia (as a cold medium) entering the heat exchanger 23. The liquid ammonia is vaporized into gaseous ammonia. After the high-temperature cracked gas passes through the heat exchanger, its temperature decreases and it enters the cracked gas injection module 50.

[0059] The pyrolysis gas injection module 50 includes: a pyrolysis gas pressure stabilizing tank 51, a water-cooled radiator 52, a diaphragm compressor 53, and an air-cooled radiator 54.

[0060] The cracked gas pressure stabilizing tank 51 is connected to the heat exchanger 23 and the water-cooled radiator 52 respectively; the water-cooled radiator 52 is connected to the diaphragm compressor 53; the diaphragm compressor 53 is connected to the air-cooled radiator 54; and the air-cooled radiator 54 is connected to the engine body.

[0061] The control module 90 is used to control the hydrogen production chamber 43 to reach a corresponding target temperature based on the temperature of the hydrogen production chamber, and is also used to control the ammonia vaporization unit 21 to reach a corresponding target temperature based on the temperature of the ammonia vaporization unit.

[0062] In one embodiment, the engine body includes: an ammonia fuel engine 100, an intake manifold, an exhaust manifold, and a nozzle.

[0063] The intake manifold, the exhaust manifold, and the nozzle are all connected to the ammonia fuel engine; the intake manifold is connected to the injection valve 63; and the nozzle is connected to the air-cooled radiator 54 of the cracked gas injection module 50.

[0064] In one embodiment, the device further includes a post-processing unit 70; the post-processing unit 70 is connected to the ammonia cracking reaction hydrogen production chamber 43.

[0065] In one embodiment, it also includes an exhaust pipe 80.

[0066] The exhaust pipe 80 connects to the exhaust manifold, the ammonia cracking reaction hydrogen production chamber 43, and the after-treatment device 70.

[0067] The working principle of the on-board ammonia-to-hydrogen system in this application is as follows:

[0068] When the vehicle is powered on and the test is normal, an engine start signal is sent to the control module. Upon receiving the signal, the control module initiates heating in each heating unit, using electric heating to heat the ammonia vaporization unit and the ammonia cracking reaction hydrogen production chamber. When the control module detects that the temperature sensors on the ammonia vaporization unit and the ammonia cracking reaction hydrogen production chamber have reached the preset temperature, a trigger signal is sent to control the liquid ammonia pump and the first electrically controlled three-way valve on the ammonia supply module to begin supplying liquid ammonia to the ammonia vaporization unit. The liquid ammonia is then converted into gaseous ammonia. This gaseous ammonia enters the ammonia cracking reaction hydrogen production module through the first gas supply line, where it is decomposed into a high-temperature cracked gas consisting of nitrogen, hydrogen, and undecomposed gaseous ammonia. This high-temperature cracked gas enters a heat exchanger as a heat medium, exchanging heat with the liquid ammonia (which acts as a cold medium) entering the heat exchanger, where the liquid ammonia is vaporized into gaseous ammonia. After the heat exchange, the temperature of the high-temperature cracked gas decreases, and it enters the cracked gas pressure stabilizing tank. (After the ammonia cracking reaction hydrogen production module produces hydrogen through normal cracking, the resulting high-temperature cracked gas can be used as a heat source on the hot side of the heat exchanger to meet the heat requirements for liquid ammonia vaporization. The electric heating of the ammonia vaporization unit then stops working.) After being cooled and pressurized by the diaphragm compressor, the high-temperature cracked gas is then injected into the engine combustion chamber according to the engine's operating conditions, calculated by the control module. Together with the amount of gaseous ammonia injected through the second gas supply line, this ensures normal combustion in the engine.

[0069] This invention provides an on-board ammonia-to-hydrogen system. The hydrogen produced by this system achieves fuel reactivity complementarity, thus requiring only a single ammonia fuel storage device, which simplifies the on-board setup and improves economic efficiency. This application meets the requirements for vehicles with single-fuel ammonia engines. This application is adaptable to various heating methods, including engine exhaust waste heat heating and electric heating.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A vehicle-mounted ammonia-to-hydrogen system, characterized in that, include: Ammonia supply module, liquid ammonia vaporization module, first gas supply pipeline, ammonia cracking reaction hydrogen production module, cracked gas injection module, second gas supply pipeline, control module, first temperature sensor and second temperature sensor; The ammonia supply module and the liquid ammonia vaporization module are connected; the liquid ammonia vaporization module is connected to the ammonia cracking reaction hydrogen production module through the first gas supply pipeline; the liquid ammonia vaporization module is also connected to the engine body through the second gas supply pipeline; the liquid ammonia vaporization module is also connected to the cracked gas injection module; the control module is connected to the ammonia supply module, the liquid ammonia vaporization module, the first gas supply pipeline, the ammonia cracking reaction hydrogen production module, the cracked gas injection module, the second gas supply pipeline, the first temperature sensor, and the second temperature sensor, respectively. The liquid ammonia vaporization module is equipped with the first temperature sensor; the first temperature sensor is used to monitor the temperature of the ammonia vaporization unit. The ammonia cracking reaction hydrogen production module is equipped with the second temperature sensor; the second temperature sensor is used to monitor the temperature of the ammonia cracking reaction hydrogen production chamber. The control module is used to control the hydrogen production chamber of the ammonia cracking reaction to reach a corresponding target temperature based on the temperature of the hydrogen production chamber of the ammonia cracking reaction, and is also used to control the ammonia gasification unit to reach a corresponding target temperature based on the temperature of the ammonia gasification unit.

2. The on-board ammonia-to-hydrogen system according to claim 1, characterized in that, The ammonia supply module includes: a liquid ammonia tank, a liquid ammonia pump, and a first electrically controlled three-way valve; The liquid ammonia tank and the liquid ammonia pump are connected; the liquid ammonia pump is connected to the liquid ammonia vaporization module through the first electrically controlled three-way valve.

3. The on-board ammonia-to-hydrogen system according to claim 2, characterized in that, The liquid ammonia vaporization module includes: an ammonia vaporization unit, a first heating unit, a heat exchanger, and a second electrically controlled three-way valve; The ammonia vaporization unit and the heat exchanger are both connected to the first electrically controlled three-way valve; the first heating unit is connected to the ammonia vaporization unit; and the ammonia vaporization unit and the heat exchanger are also connected to the second electrically controlled three-way valve.

4. The on-board ammonia-to-hydrogen system according to claim 3, characterized in that, The first gas supply pipeline includes: a first pressure regulating valve and a first ammonia flow meter; One end of the first pressure regulating valve is connected to the first electrically controlled three-way valve; the other end of the first pressure regulating valve is connected to the first ammonia flow meter; the first ammonia flow meter is connected to the control module.

5. The on-board ammonia-to-hydrogen system according to claim 3, characterized in that, The second gas supply line includes: a second pressure regulating valve, a second ammonia flow meter, and an injection valve; One end of the second pressure regulating valve is connected to the first electrically controlled three-way valve; the other end of the second pressure regulating valve is connected to the second ammonia flow meter; the second ammonia flow meter is connected to the injection valve; and the injection valve is connected to the control module.

6. The on-board ammonia-to-hydrogen system according to claim 4, characterized in that, The ammonia cracking reaction hydrogen production module includes: an inlet end, an outlet end, an ammonia cracking reaction hydrogen production chamber, and a second heating unit; The inlet end is connected to the first ammonia flow meter; the outlet end is connected to the heat exchanger; both the inlet end and the outlet end are located on the ammonia cracking reaction hydrogen production chamber; the second heating unit is connected to the ammonia cracking reaction hydrogen production chamber and the control module respectively.

7. The on-board ammonia-to-hydrogen system according to claim 3, characterized in that, The pyrolysis gas injection module includes: a pyrolysis gas pressure stabilizing tank, a water-cooled radiator, a diaphragm compressor, and an air-cooled radiator; The cracked gas pressure stabilizing tank is connected to the heat exchanger and the water-cooled radiator respectively; the water-cooled radiator is connected to the diaphragm compressor; the diaphragm compressor is connected to the air-cooled radiator; and the air-cooled radiator is connected to the engine body.

8. The on-board ammonia-to-hydrogen system according to claim 5, characterized in that, The engine body includes: an ammonia fuel engine, an intake manifold, an exhaust manifold, and nozzles; The intake manifold, the exhaust manifold, and the nozzle are all connected to the ammonia fuel engine; the intake manifold is connected to the injection valve; and the nozzle is connected to the air-cooled radiator of the cracked gas injection device.

9. The on-board ammonia-to-hydrogen system according to claim 8, characterized in that, Also includes: Post-processing device; the post-processing device is connected to the ammonia cracking reaction hydrogen production chamber.

10. The on-board ammonia-to-hydrogen system according to claim 9, characterized in that, Also includes: Exhaust pipe; The exhaust pipe connects to the exhaust manifold, the ammonia cracking reaction hydrogen production chamber, and the after-treatment device.

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