Engine system and control method

Abstract

The invention relates to an engine system and a control method in the technical field of engines, the engine system comprises an engine body, a combustion chamber is formed in the engine body, and the engine body is provided with an air inlet channel and an air outlet channel which communicate with the combustion chamber; the fuel supply module is connected with the combustion chamber through a fuel injector; a first pipeline and a second pipeline which are connected in parallel are connected between the ammonia gas supply module and the gas inlet channel; an ammonia gas stop valve and an ammonia gas injection valve are sequentially connected to the first pipeline in the direction from the ammonia gas supply module to the gas inlet channel; an ammonia reaction hydrogen production device, a hydrogen and nitrogen cut-off valve and a hydrogen and nitrogen injection valve are sequentially connected to the second pipeline in the direction from the ammonia gas supply module to the gas inlet channel. According to the engine system and the control method, the emission amount of carbon dioxide can be effectively reduced, and two-fuel combustion or three-fuel combustion of the engine is achieved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine system and a control method. Background Art

[0002] In order to reduce carbon dioxide emissions, traditional fuel vehicles have gradually changed. Ammonia fuel is a zero-carbon fuel that does not produce carbon emissions, but ammonia has a high minimum ignition energy and a slow flame propagation speed, and is not suitable for use as a fuel in an engine alone. For example, Chinese patent CN116146361A discloses a hydrogen, diesel, and ammonia ternary fuel engine combustion system and combustion method, wherein diesel and ammonia fuels are directly injected into the cylinder, and hydrogen is premixed. However, the engine structure is complex. In terms of combustion, it uses three fuels for combustion at low loads, and diesel and ammonia are mixed for combustion at high loads. It can only reduce some carbon emissions at high loads, and there is still a large carbon dioxide emission problem. Summary of the invention

[0003] In view of the problems existing in the background technology, the present application provides an engine system and a control method, which can effectively reduce the emission of carbon dioxide.

[0004] According to one aspect of the present invention, there is provided an engine system, comprising: an engine body, a combustion chamber is formed in the engine body, and an intake passage and an exhaust passage connected to the combustion chamber are provided on the engine body; a fuel supply module, the fuel supply module is connected to the combustion chamber through a fuel injector; an ammonia supply module, a first pipeline and a second pipeline in parallel are connected between the ammonia supply module and the intake passage; an ammonia shut-off valve and an ammonia injection valve are sequentially connected on the first pipeline from the ammonia supply module to the intake passage; an ammonia reaction hydrogen generator, a hydrogen-nitrogen shut-off valve and a hydrogen-nitrogen injection valve are sequentially connected on the second pipeline from the ammonia supply module to the intake passage.

[0005] In some embodiments of the present invention, the ammonia reaction hydrogen generator is heated by an electric heating plate or the electric heating plate and the exhaust gas from the exhaust duct are used to heat the catalyst for reduction to produce hydrogen.

[0006] In some embodiments of the present invention, a temperature sensor is provided on the ammonia reaction hydrogen generator.

[0007] In some embodiments of the present invention, a heat exchanger is provided on the second pipeline between the ammonia reaction hydrogen generator and the hydrogen-nitrogen shut-off valve.

[0008] In some embodiments of the present invention, the catalyst is selected from ruthenium-based catalysts.

[0009] In some embodiments of the present invention, the ammonia supply module includes a liquid ammonia tank and a liquid ammonia evaporator, and the liquid ammonia tank is connected to the first pipeline and the second pipeline through the liquid ammonia evaporator.

[0010] In some embodiments of the present invention, a pressure reducing valve is connected on the second pipeline between the liquid ammonia evaporator and the ammonia reaction hydrogen producer.

[0011] According to another aspect of the present invention, there is provided a control method for an engine system, comprising the following steps:

[0012] First, use fuel to perform cold start; then, under a certain load, activate the first pipeline and the second pipeline in steps, including opening the ammonia injection valve and the ammonia cut-off valve on the first pipeline, and opening the ammonia reaction hydrogen generator, the hydrogen-nitrogen cut-off valve and the hydrogen-nitrogen injection valve on the second pipeline, gradually increase the ammonia injection amount and the hydrogen-nitrogen injection amount, and reduce the fuel injection amount until the fuel is reduced to 0, so that the hydrogen-nitrogen and ammonia are mixed and burned;

[0013] Alternatively, after the engine is cold started, the ammonia injection valve and the ammonia shut-off valve and the hydrogen-nitrogen shut-off valve and the hydrogen-nitrogen injection valve are opened step by step to allow the fuel, ammonia and hydrogen-nitrogen to be mixed and burned in proportion.

[0014] In some embodiments of the present invention, when the first pipeline and the second pipeline are activated step by step, the engine cooling water temperature reaches 80°C.

[0015] In some embodiments of the present invention, when the second pipeline is activated, the temperature of the ammonia reaction hydrogen generator reaches 380° C., and the conversion efficiency of the ammonia reaction hydrogen generator reaches 90%.

[0016] Compared with the prior art, the present invention achieves the following technical effects:

[0017] 1. The present invention realizes mixed combustion of three different fuels through gasoline, ammonia (liquid ammonia evaporates), and hydrogen and nitrogen (exhaust gas and electric heating plate are heated simultaneously to decompose ammonia). Gasoline is directly injected into the cylinder using an injector for fuel injection, and ammonia and hydrogen and nitrogen are injected into the intake duct and controlled by an injection valve, thereby realizing zero carbon emissions during the normal working stage of the engine and the acceleration or high load stage, and can effectively reduce carbon dioxide emissions.

[0018] 2. The present invention can not only realize the mixed combustion of two fuels, but also realize the mixed combustion of three fuels. It can not only reduce carbon emissions, but also has more application scenarios, strong adaptability and broad application prospects.

[0019] 3. The present invention can utilize the characteristics of gasoline to quickly start the engine, and after the engine runs smoothly, gradually switch to the ammonia-hydrogen mixed combustion mode. In this way, the problem of slow cold start of the ammonia-hydrogen engine can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the engine system of the present invention;

[0022] Figure 2 This is a flow chart of the mixed combustion of gasoline, hydrogen, nitrogen and ammonia provided by the present invention;

[0023] Figure 3 The present invention provides a flow chart of the mixed combustion of ammonia, hydrogen and nitrogen.

[0024] The reference numerals in the accompanying drawings represent as follows: 1. liquid ammonia tank; 2. liquid ammonia evaporator; 3. ammonia reaction hydrogen generator; 4. hydrogen and nitrogen shut-off valve; 5. ammonia shut-off valve; 6. hydrogen and nitrogen injection valve; 7. ammonia injection valve; 8. fuel injector; 9. spark plug; 10. intake duct; 11. combustion chamber; 12. engine body; 13. exhaust duct; 14. temperature sensor; 15. heat exchanger; 16. fuel tank; 17. fuel rail; 18. electric heating plate; 19. pressure reducing valve. DETAILED DESCRIPTION

[0025] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0027] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0028] The present application embodiment discloses an engine system. Figure 1 As shown, the engine system includes an engine body 12, a fuel supply module and an ammonia supply module.

[0029] A combustion chamber 11 is formed in the engine body 12 , and an intake passage 10 and an exhaust passage 13 communicating with the combustion chamber 11 are provided on the engine body 12 ; the fuel supply module is connected to the combustion chamber 11 through the injector 8 .

[0030] A first pipeline and a second pipeline in parallel are connected between the ammonia supply module and the intake duct 10; wherein, on the first pipeline, an ammonia shut-off valve 5 and an ammonia injection valve 7 are sequentially connected from the ammonia supply module to the intake duct 10; on the second pipeline, an ammonia reaction hydrogen generator 3, a hydrogen-nitrogen shut-off valve 4 and a hydrogen-nitrogen injection valve 6 are sequentially connected from the ammonia supply module to the intake duct 10.

[0031] By using the engine system in the technical solution, at the start-up stage of the engine, the fuel supply module and the injector 8 are first turned on to allow the fuel to be directly injected into the cylinder and enter the fuel combustion mode. After the cooling water of the engine reaches the temperature and the operation is stable, the ammonia supply module is turned on, and the ammonia shut-off valve 5 and the ammonia injection valve 7 on the first pipeline are opened step by step, and the ammonia reaction hydrogen generator 3, the hydrogen-nitrogen shut-off valve 4 and the hydrogen-nitrogen injection valve 6 on the second pipeline are opened, so that ammonia and hydrogen are both injected into the intake duct 10. By gradually increasing the ammonia injection amount and the hydrogen-nitrogen (hydrogen-nitrogen mixture) injection amount and reducing the fuel injection amount until the fuel injection amount reaches 0, the engine enters the ammonia and hydrogen-nitrogen mixed combustion mode, thereby realizing the conversion of the engine from the fuel combustion mode to the ammonia-hydrogen mixed combustion mode, and then achieving zero carbon emissions during the normal working stage of the engine and the acceleration or high load stage, thereby effectively reducing carbon dioxide emissions.

[0032] In some embodiments of the present invention, the engine system can not only realize the mixed combustion of two fuels of ammonia and hydrogen-nitrogen, but also realize the mixed combustion of three fuels of fuel oil, ammonia and hydrogen-nitrogen, that is, the engine system can enter the mixed combustion mode of fuel oil, ammonia and hydrogen-nitrogen.

[0033] In this embodiment, during the start-up phase of the engine, the fuel supply module and the injector 8 are first turned on to allow the fuel to be directly injected into the cylinder, enter the fuel combustion mode, reduce incomplete combustion or misfires, quickly start the engine to increase the cooling water temperature, and after the cooling water of the engine reaches the temperature and the operation is stable, turn on the ammonia supply module, and step by step open the ammonia shut-off valve 5 and the ammonia injection valve 7 on the first pipeline, and open the ammonia reaction hydrogen generator 3, the hydrogen-nitrogen shut-off valve 4 and the hydrogen-nitrogen injection valve 6 on the second pipeline, so that ammonia and hydrogen are both injected into the air, the ammonia injection amount and the hydrogen-nitrogen injection amount are increased, the fuel injection amount is reduced, and the fuel, ammonia and hydrogen-nitrogen are mixed and burned in proportion, and the fuel, ammonia and hydrogen-nitrogen mixed combustion mode can be entered.

[0034] In some embodiments of the present invention, after the cooling water of the engine reaches temperature and runs smoothly, the ammonia shut-off valve 5 and the ammonia injection valve 7 on the first pipeline and the ammonia reaction hydrogen generator 3, the hydrogen-nitrogen shut-off valve 4 and the hydrogen-nitrogen injection valve 6 on the second pipeline are opened in no particular order.

[0035] For example, after the ammonia reaction hydrogen generator 3 is in a stable operating state, the ammonia reaction hydrogen generator 3, the hydrogen-nitrogen shut-off valve 4 and the hydrogen-nitrogen injection valve 6 on the second pipeline can be opened first to allow the fuel and hydrogen-nitrogen to be mixed and burned, and the hydrogen-nitrogen injection amount can be gradually increased and the fuel injection amount can be reduced. Then, the ammonia shut-off valve 5 and the ammonia injection valve 7 on the first pipeline can be opened, and the ammonia injection amount can be gradually increased and the fuel injection amount can be reduced again, thereby entering a mixed combustion mode of ammonia and hydrogen-nitrogen or a mixed combustion mode of fuel, ammonia and hydrogen-nitrogen.

[0036] Alternatively, first open the ammonia shut-off valve 5 and the ammonia injection valve 7 on the first pipeline to allow the fuel and ammonia to be mixed and burned, and gradually increase the ammonia injection amount and reduce the fuel injection amount; then, after the ammonia reaction hydrogen generator 3 is in a stable operating state, open the ammonia reaction hydrogen generator 3, the hydrogen-nitrogen shut-off valve 4 and the hydrogen-nitrogen injection valve 6 on the second pipeline, and gradually increase the hydrogen-nitrogen injection amount, and reduce the fuel injection amount again, thereby entering the ammonia and hydrogen-nitrogen mixed combustion mode or the fuel, ammonia and hydrogen-nitrogen mixed combustion mode.

[0037] In some embodiments of the present invention, Figure 1 As shown, the ammonia reaction hydrogen generator 3 is heated by the electric heating plate 18 or the electric heating plate 18 and the tail gas from the exhaust passage 13 are used to heat the catalyst for reduction to produce hydrogen.

[0038] By heating the catalyst in the ammonia reaction hydrogen generator 3 to reduce ammonia to produce hydrogen, high efficiency and low cost can be achieved, and high-purity hydrogen and nitrogen can be obtained, so that the ammonia reaction hydrogen generator 3 has a high conversion efficiency for ammonia.

[0039] Preferably, the ammonia reaction hydrogen generator 3 uses an electric heating plate 18 and the exhaust gas from the exhaust duct 13 to jointly heat the catalyst to reduce and produce hydrogen. The exhaust gas from the exhaust duct 13 cooperates with the electric heating plate 18 to jointly heat the catalyst and ammonia to produce hydrogen, which can effectively improve the utilization rate of the exhaust gas heat and reduce energy consumption.

[0040] Furthermore, the catalyst is selected from a ruthenium-based catalyst. Compared with a nickel-based catalyst, the ruthenium-based catalyst is a medium-temperature ammonia decomposition catalyst with a lower catalytic reaction temperature, which effectively reduces the heating temperature of the catalyst and ammonia. Not only does it have low reaction conditions, but it can also more quickly improve the conversion efficiency of the ammonia reaction hydrogen generator 3, so that the ammonia reaction hydrogen generator 3 can more quickly meet the conditions for injecting hydrogen and nitrogen into the intake duct 10.

[0041] In some embodiments of the present invention, Figure 1 As shown, a temperature sensor 14 is provided on the ammonia reaction hydrogen generator 3 .

[0042] By detecting the temperature of the ammonia reaction hydrogen generator 3 through the temperature sensor 14 , the operating state of the ammonia reaction hydrogen generator 3 and the hydrogen production by the catalytic reaction of ammonia, such as the conversion efficiency of the ammonia reaction hydrogen generator 3 can be effectively monitored.

[0043] In some embodiments of the present invention, Figure 1 As shown, a heat exchanger 15 is provided on the second pipeline between the ammonia reaction hydrogen generator 3 and the hydrogen-nitrogen shut-off valve 4. The heat exchanger 15 is used to reduce the decomposed high-temperature gas to a certain temperature to reach a low-temperature state.

[0044] In some embodiments of the present invention, Figure 1 As shown, the ammonia supply module includes a liquid ammonia tank 1 and a liquid ammonia evaporator 2, and the liquid ammonia tank 1 is connected to the first pipeline and the second pipeline through the liquid ammonia evaporator 2.

[0045] In this embodiment, the liquid ammonia tank 1 transports liquid ammonia to the liquid ammonia evaporator 2. The liquid ammonia is heated by the liquid ammonia evaporator 2 and converted into ammonia gas with a certain pressure, and then transported to the first pipeline and the second pipeline.

[0046] In some embodiments of the present invention, the liquid ammonia evaporator 2 may be heated by using cooling water of the engine or by using an external heat source.

[0047] In some embodiments of the present invention, a pressure reducing valve 19 is connected to the second pipeline between the liquid ammonia evaporator 2 and the ammonia reaction hydrogen generator 3 .

[0048] In this embodiment, liquid ammonia is heated by a liquid ammonia evaporator 2 and converted into ammonia gas with a pressure of 10-12 bar, a part of which is introduced into the intake duct 10 (intake manifold) of the engine, and the other part of the ammonia gas is adjusted to below 8 bar by a pressure reducing valve 19 and then introduced into an ammonia reaction hydrogen generator 3. The catalyst is heated by the engine exhaust gas and the electric heating plate 18 at the same time, and is decomposed into hydrogen and nitrogen after reaching a certain temperature.

[0049] In some embodiments of the present invention, the engine system also includes a control system, which is signal-connected to the liquid ammonia tank 1, the liquid ammonia evaporator 2, the ammonia reaction hydrogen generator 3, the ammonia shut-off valve 5, the hydrogen-nitrogen shut-off valve 4, the ammonia injection valve 7, the hydrogen-nitrogen injection valve 6, the injector 8, the temperature sensor 14, etc. The control system regulates the fuel injection, the ammonia and the hydrogen-nitrogen injection, and monitors the operating status of the engine and the status of the liquid ammonia evaporator 2 and the ammonia reaction hydrogen generator 3 in real time.

[0050] In some embodiments of the present invention, Figure 1 As shown, the fuel supply module includes a fuel tank 16 and a fuel rail 17 , and the fuel tank 16 is connected to the fuel injector 8 via the fuel rail 17 .

[0051] In some embodiments of the present invention, Figure 1 As shown, the engine body 12 is provided with a spark plug 9 in the combustion chamber 11 for igniting the mixture in the combustion chamber 11 .

[0052] In some embodiments of the present invention, the fuel includes but is not limited to gasoline, diesel and the like.

[0053] The present application also discloses a control method for the above engine system, which comprises the following steps:

[0054] Start with a cold start using fuel first.

[0055] Then, under a certain load, the first pipeline and the second pipeline are activated step by step. The first pipeline includes opening the ammonia reaction hydrogen generator, the hydrogen-nitrogen shut-off valve and the hydrogen-nitrogen injection valve, and the second pipeline includes opening the ammonia injection valve and the ammonia shut-off valve. The ammonia injection amount and the hydrogen-nitrogen injection amount are gradually increased, and the fuel injection amount is reduced until the fuel is reduced to 0, so that the hydrogen-nitrogen and ammonia are mixed and burned.

[0056] Alternatively, after the engine is cold started, the ammonia injection valve and the ammonia shut-off valve and the hydrogen-nitrogen shut-off valve and the hydrogen-nitrogen injection valve are opened step by step to allow the fuel, ammonia and hydrogen-nitrogen to be mixed and burned in proportion.

[0057] The control method of the present invention can realize the mixed combustion of three fuels of fuel oil, ammonia and hydrogen and nitrogen or the mixed combustion of two fuels of ammonia and hydrogen and nitrogen.

[0058] like Figure 2As shown, taking gasoline as fuel as an example, the control method for the mixed combustion of three fuels of gasoline, ammonia and hydrogen and nitrogen includes the following steps:

[0059] 1) First, since the engine cooling water temperature is low when starting, using gasoline to start the engine first can reduce the occurrence of incomplete combustion or misfires, and can quickly start the engine to increase the cooling water temperature to a certain temperature, such as 80°C.

[0060] 2) Then, under a certain load, open the ammonia shut-off valve and the ammonia injection valve to allow ammonia to enter the combustion chamber of the engine body and mix with gasoline for combustion.

[0061] 3) The temperature of the ammonia reaction hydrogen generator is heated by the exhaust gas and the electric heating plate to heat the catalyst. When it reaches 380°C, for example, and the conversion efficiency is relatively high, such as 90%, the hydrogen-nitrogen shut-off valve and the hydrogen-nitrogen injection valve are opened to allow hydrogen and nitrogen to enter the combustion chamber of the engine body, thereby achieving mixed combustion of hydrogen and nitrogen with gasoline and ammonia.

[0062] The above steps 2) and 3) can achieve stable combustion of the engine in no particular order.

[0063] like Figure 3 As shown, taking gasoline as fuel as an example, the control method for the mixed combustion of two fuels of ammonia and hydrogen and nitrogen includes the following steps:

[0064] 1) During the engine startup phase, first use gasoline for a cold start until the engine cooling water temperature reaches 80°C.

[0065] 2) Then under a certain load, when the temperature of the ammonia reaction hydrogen generator reaches 380°C and the conversion efficiency of the ammonia reaction hydrogen generator is 90%, the hydrogen and nitrogen shut-off valve and the hydrogen and nitrogen injection valve are opened, and the hydrogen and nitrogen are mixed with gasoline for combustion; the hydrogen and nitrogen injection amount is increased, and the gasoline injection amount is gradually reduced.

[0066] 3) When the gasoline energy proportion reaches a certain ratio, such as 70%, the ammonia injection valve and the ammonia shut-off valve are opened, and ammonia is mixed with gasoline and hydrogen and nitrogen to burn; the ammonia injection amount is gradually increased and the gasoline injection amount is reduced until the gasoline is reduced to 0, thereby achieving mixed combustion of hydrogen, nitrogen and ammonia.

[0067] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An engine system, characterized in that: include: An engine body, wherein a combustion chamber is formed in the engine body, and an intake passage and an exhaust passage communicating with the combustion chamber are provided on the engine body; A fuel supply module, wherein the fuel supply module is connected to the combustion chamber via a fuel injector; an ammonia supply module, wherein a first pipeline and a second pipeline connected in parallel are connected between the ammonia supply module and the air inlet; An ammonia shut-off valve and an ammonia injection valve are sequentially connected on the first pipeline from the ammonia supply module toward the air intake passage; The second pipeline is connected in sequence from the ammonia supply module to the air inlet with an ammonia reaction hydrogen generator, a hydrogen-nitrogen shut-off valve and a hydrogen-nitrogen injection valve.

2. The engine system according to claim 1, characterized in that: The ammonia reaction hydrogen generator is heated by an electric heating plate or by using the electric heating plate and the tail gas of the exhaust duct to heat the catalyst for reduction to produce hydrogen.

3. The engine system according to claim 2, characterized in that: The ammonia reaction hydrogen generator is provided with a temperature sensor.

4. The engine system according to claim 2, characterized in that: A heat exchanger is provided on the second pipeline between the ammonia reaction hydrogen generator and the hydrogen-nitrogen shut-off valve.

5. The engine system according to claim 2, characterized in that: The catalyst is selected from ruthenium-based catalysts.

6. The engine system according to claim 1, characterized in that: The ammonia supply module includes a liquid ammonia tank and a liquid ammonia evaporator, and the liquid ammonia tank is connected to the first pipeline and the second pipeline through the liquid ammonia evaporator.

7. The engine system according to claim 6, characterized in that: A pressure reducing valve is connected on the second pipeline between the liquid ammonia evaporator and the ammonia reaction hydrogen generator.

8. A control method for an engine system, characterized in that: The following steps are involved: First, use fuel for a cold start; Then, under a certain load, the first pipeline and the second pipeline are activated step by step, including opening the ammonia injection valve and the ammonia cut-off valve on the first pipeline, and opening the ammonia reaction hydrogen generator, the hydrogen-nitrogen cut-off valve and the hydrogen-nitrogen injection valve on the second pipeline, gradually increasing the ammonia injection amount and the hydrogen-nitrogen injection amount, and reducing the fuel injection amount until the fuel is reduced to 0, so that the hydrogen-nitrogen and ammonia are mixed and burned; or After the engine is cold started, the ammonia injection valve and the ammonia shut-off valve and the hydrogen-nitrogen shut-off valve and the hydrogen-nitrogen injection valve are opened step by step, so that the fuel, ammonia and hydrogen-nitrogen are mixed and burned in proportion.

9. The control method according to claim 8, characterized in that: When the first pipeline and the second pipeline are activated step by step, the engine cooling water temperature reaches 80°C.

10. The control method according to claim 8, characterized in that: When the second pipeline is activated, the temperature of the ammonia reaction hydrogen generator reaches 380°C, and the conversion efficiency of the ammonia reaction hydrogen generator reaches 90%.

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