Self-heating ammonia decomposition hydrogen production system applied to mobile terminal

Abstract

The invention discloses a self-heating type ammonia decomposition hydrogen production system applied to a mobile terminal in the technical field of ammonia hydrogen production. The system comprises an ammonia storage tank, a heat exchanger, a pressurizer, an ammonia fuel engine, a self-heating type ammonia decomposition reactor, a hydrogen buffer tank and a tail gas aftertreatment device, in the ammonia decomposition hydrogen production reactor, ammonia gas in an ammonia storage tank and hydrogen generated by ammonia decomposition are mixed and combusted to supply heat; tail gas generated after mixed combustion of ammonia and hydrogen in the ammonia fuel engine and the self-heating type ammonia decomposition reactor is used for preheating ammonia gas to enter the ammonia decomposition reactor, and then the tail gas is discharged after being treated by the tail gas treatment device; ammonia gas is supplied in three paths and is respectively used for hydrogen production through ammonia decomposition, combustion in an engine and combustion heat supply in a reactor; and hydrogen is used in two paths and is used for supplying heat for ignition fuel in the engine and combustion in the reactor respectively. The system fully considers the use requirement of the mobile terminal and energy recycling, and has the characteristics of compact structure, high energy utilization rate, adaptation to an ammonia fuel engine and the like.

Description

Technical Field

[0001] The present invention relates to a hydrogen production system in the technical field of ammonia hydrogen production, and in particular to an energy-efficient cyclic utilization self-heating type ammonia decomposition hydrogen production system applied to mobile terminals, which is equipped with a combustion chamber and an ammonia fuel engine. Background Art

[0002] Global warming is one of the most severe challenges faced by countries around the world today. The green transformation of the energy structure has become one of the themes of world development. Ammonia and hydrogen, as two zero-carbon fuels that can be converted into each other, the integrated application of ammonia and hydrogen is widely regarded as one of the most promising ways to achieve green alternative fuels in the future. Developing ammonia fuel engines will be an important way for the global transportation sector to transform towards low-carbon and zero-carbon. In response to the demand for blended fuels in ammonia fuel engines, the on-site ammonia decomposition hydrogen production technology can solve the problem of the fuel supply end of ammonia fuel engines and realize the application of ammonia fuels.

[0003] Currently, ammonia decomposition hydrogen production equipment mainly adopts the form of electric heating and is mostly used for ammonia decomposition hydrogen production at fixed terminals, such as industrial production or hydrogen refueling stations. There is a lack of a reaction system with a compact structure and high energy utilization rate dedicated to ammonia decomposition hydrogen production for mobile terminals. Therefore, there is a need for an ammonia decomposition hydrogen production system suitable for mobile terminals, with high energy utilization rate and portability.

[0004] In the prior art, there is a patent for invention with the publication number CN117069056A and the name of "A self-heating type ammonia decomposition reaction system and hydrogen production method". This patent uses two sequentially connected burners and ammonia decomposition reactors. In the system, the first ammonia decomposition reactor and the second ammonia decomposition reactor are arranged in series. The ammonia storage device is connected to the first ammonia decomposition reactor, and the second ammonia decomposition reactor is connected to the collection device. A second heating channel is provided on the outer wall of the second inner tube of the second ammonia decomposition reactor, whose second intake end is connected to the second burner, and the second outlet end is connected to the first burner. A first heating channel is also provided on the outer wall of the first inner tube of the first ammonia decomposition reactor, whose first intake end is connected to the first burner, and the first outlet end is used to discharge the gas in the first heating channel from the first ammonia decomposition reactor. Although this system reduces the gas consumption required for ammonia decomposition, the compactness, response speed, and energy utilization efficiency of the system cannot meet the ammonia hydrogen production requirements of mobile terminals and are more suitable for ammonia decomposition hydrogen production at fixed terminals. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an energy-efficient cyclic utilization self-heating type ammonia decomposition hydrogen production system applied to mobile terminals. The system of the present invention integrates the burner and the reactor, saving space and reducing heat loss. The overall system energy cycle path coupled with the engine and the tail gas treatment are overall designed and planned to more efficiently recycle the waste heat of the tail gas.

[0006] The present invention is realized through the following technical solutions: The present invention includes an ammonia storage tank, a heat exchanger, a pressurizer, an ammonia fuel engine, a self-heating ammonia decomposition reactor, a hydrogen buffer tank, an exhaust gas after-treatment device, an ammonia inlet, a fuel gas inlet, a combustion chamber, a reaction channel, a combustion exhaust gas outlet, a decomposed gas outlet, a cylinder body, a tube sheet, a spark plug, an air inlet, an ammonia storage tank discharge pipe, a pressurizer feed pipe, a pressurizer discharge pipe, an engine exhaust pipe, a burner exhaust pipe, a mixed exhaust pipe, an ammonia main pipe, a first branch pipe, a second branch pipe, a hydrogen main pipe, a third branch pipe, and a fourth branch pipe; the inlet end of the ammonia storage tank discharge pipe is communicated with the outlet of the ammonia storage tank, and the outlet end of the ammonia storage tank discharge pipe is communicated with the feed port of the heat exchanger; one end of the pressurizer feed pipe is communicated with the ammonia storage tank discharge pipe, and the other end of the pressurizer feed pipe is communicated with the feed port of the pressurizer; the inlet end of the pressurizer discharge pipe is communicated with the outlet end of the pressurizer, and the outlet end of the pressurizer discharge pipe is communicated with the feed port of the ammonia fuel engine; the inlet of the engine exhaust pipe is communicated with the exhaust port of the ammonia fuel engine, and the outlet of the engine exhaust pipe, the outlet of the burner exhaust pipe, and the inlet of the mixed exhaust pipe are communicated together, and are connected in series to the mixed exhaust pipe in sequence along the flow direction of the mixed exhaust gas to the heat exchanger and the exhaust gas after-treatment device; the inlet of the ammonia main pipe is communicated with the outlet of the heat exchanger, and the outlet of the ammonia main pipe, the outlet of the fourth branch pipe, and the inlet of the second branch pipe are communicated together; the hydrogen buffer tank is connected in series to the hydrogen main pipe, and the inlet of the third branch pipe, the inlet of the fourth branch pipe, and the outlet of the hydrogen main pipe are communicated together, and the outlet of the third branch pipe is connected to the pressurizer feed pipe; the self-heating ammonia decomposition reactor includes an ammonia inlet, a fuel gas inlet, a combustion chamber, a reaction channel, a combustion exhaust gas outlet, a decomposed gas outlet, a cylinder body, a tube sheet, a spark plug, and an air inlet. The ammonia inlet, the fuel gas inlet, the combustion exhaust gas outlet, and the decomposed gas outlet are arranged on the outer wall of the cylinder body. The ammonia inlet and the combustion exhaust gas outlet are arranged at both ends of the cylinder body. The fuel gas inlet is close to the ammonia inlet, and the combustion exhaust gas outlet is close to the decomposed gas outlet. The combustion chamber and the reaction channel are both arranged inside the cylinder body. The ammonia inlet and the decomposed gas outlet are respectively communicated with both ends of the reaction channel. One end of the combustion chamber away from the fuel gas inlet is open. The space formed between the fuel gas inlet, the combustion chamber and the cylinder body, the tube sheet, and the wall surface of the reaction channel is communicated. The reaction channel is filled with a catalyst beneficial to the ammonia decomposition reaction. The spark plug and the air inlet are arranged on the combustion chamber and close to the fuel gas inlet; the inlet of the burner exhaust pipe is communicated with the combustion exhaust gas outlet, the inlet of the hydrogen main pipe is communicated with the decomposed gas outlet, the outlet of the second branch pipe is communicated with the fuel gas inlet, the inlet of the first branch pipe is communicated with the ammonia main pipe, and the outlet of the first branch pipe is communicated with the ammonia inlet.

[0007] Further, in the present invention, the heat exchanger is a shell-and-tube heat exchanger with baffles inside. The overall length of the device is 600 mm and the diameter is 300 mm.

[0008] Furthermore, in the present invention, the gas inlet is a mixture of ammonia and hydrogen, with hydrogen serving as the pilot fuel for ammonia, and the energy ratio of ammonia to hydrogen being controlled between 8:1 and 7:3.

[0009] Furthermore, in the present invention, the reaction channels are 316L stainless steel tubes with a length of 500 mm, an inner diameter of 30 mm, and a wall thickness of 3 mm. There are a total of 17 such tubes. The included angle between the connecting lines of the centers of the cross-sections of adjacent tubes and the center of the cross-section of the cylinder is 18°. Starting from the bottom end of the reactor, they are symmetrically distributed on both sides inside the cylinder. The catalyst units are arranged inside the reaction channels. The catalyst units are small cylindrical segments with an outer diameter slightly smaller than the inner diameter of the reaction channels. The cross-section is honeycomb-like in shape, made of cordierite, and the inner surface is coated with an Ru-based catalytic material that is beneficial for the ammonia decomposition to hydrogen reaction.

[0010] Furthermore, in the present invention, the fuel pressure at the outlet of the pressure booster is 3 Mpa.

[0011] Furthermore, in the present invention, the pipeline connecting the external ammonia inlet and the combustion exhaust gas outlet, as well as the outside of the autothermal ammonia decomposition reactor, are all coated with cotton thermal insulation materials.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] First, the present invention integrates the burner and the reactor into one, and eliminates the separation device, greatly reducing the system size, improving the system compactness, and making it more suitable for mobile ammonia decomposition to hydrogen.

[0014] Second, the present invention adopts an autothermal ammonia decomposition to hydrogen reactor. Compared with the electric heating form, it greatly speeds up the response speed and reduces the system size, making it more adaptable to mobile hydrogen production.

[0015] Third, the present invention designs an efficient energy recycling path for the operating conditions of the coupled engine, efficiently recovers and utilizes the waste heat of the combustion exhaust gas in two places, greatly improves the system energy utilization rate, and is more energy-saving and environmentally friendly.

[0016] Fourth, the present invention designs a dedicated autothermal ammonia decomposition to hydrogen system for the coupled engine according to its operating conditions, fully considering the engine operation requirements, including fuel supply pressure requirements, response speed requirements, system size requirements, energy recycling requirements, etc., and designs components such as a pressure booster, a hydrogen buffer tank, and post-treatment. Overall consideration is given and they are properly coordinated.

[0017] Fifth, in the present invention, the ammonia-hydrogen blended combustion can not only directly heat the reaction channels with the flame, but also use the high-temperature gas after combustion to heat the reaction channels, reducing energy loss and being more efficient and concise.

[0018] Sixth, according to different gas temperature and pressure requirements, the present invention designs three-way ammonia supply and two-way hydrogen supply, which can accurately control the fluid parameters of each channel and ensure the high reliability of the overall system. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall system structure of an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the self-heating ammonia decomposition reactor in an embodiment of the present invention;

[0021] Figure 3 It is a schematic cross-sectional structure diagram of the self-heating ammonia decomposition reactor in an embodiment of the present invention;

[0022] In the figure, 1. ammonia storage tank, 2. heat exchanger, 3. pressurizer, 4. ammonia fuel engine, 5. self-heating ammonia decomposition reactor, 6. hydrogen buffer tank, 7. tail gas post-treatment device, 8. ammonia gas inlet, 9. fuel gas inlet, 10. combustion chamber, 11. reaction channel, 12. combustion tail gas outlet, 13. decomposed gas outlet, 14. cylinder body, 15. tube sheet, 16. spark plug, 17. air inlet, 18. ammonia storage tank discharge pipe, 19. pressurizer feed pipe, 20. pressurizer discharge pipe, 21. engine tail gas pipe, 22. burner tail gas pipe, 23. mixed tail gas pipe, 24. ammonia gas main pipe, 25. first branch pipe, 26. second branch pipe, 27. hydrogen gas main pipe, 28. third branch pipe, 29. fourth branch pipe. Detailed Embodiments

[0023] In order to make the content described in the present invention easier to understand, the technical solutions of the present invention are further explained below in conjunction with specific embodiments. The examples are only used to illustrate the present invention, but the present invention is not limited to this content.

[0024] Embodiment

[0025] Such as Figures 1 to 3As shown in the figure, the present invention includes an ammonia storage tank 1, a heat exchanger 2, a pressurizer 3, an ammonia fuel engine 4, an autothermal ammonia decomposition reactor 5, a hydrogen buffer tank 6, an exhaust gas aftertreatment device 7, an ammonia inlet 8, a fuel gas inlet 9, a combustion chamber 10, a reaction channel 11, a combustion exhaust gas outlet 12, a decomposed gas outlet 13, a cylinder body 14, a tube sheet 15, a spark plug 16, an air inlet 17, an ammonia storage tank discharge pipe 18, a pressurizer feed pipe 19, a pressurizer discharge pipe 20, an engine exhaust pipe 21, a burner exhaust pipe 22, a mixed exhaust pipe 23, an ammonia main pipe 24, a first branch pipe 25, a second branch pipe 26, a hydrogen main pipe 27, a third branch pipe 28, and a fourth branch pipe 29; the inlet end of the ammonia storage tank discharge pipe 18 is communicated with the outlet of the ammonia storage tank 1, and the outlet end of the ammonia storage tank discharge pipe 18 is communicated with the feed port of the heat exchanger 2; one end of the pressurizer feed pipe 19 is communicated with the ammonia storage tank discharge pipe 18, and the other end of the pressurizer feed pipe 19 is communicated with the feed port of the pressurizer 3; the inlet end of the pressurizer discharge pipe 20 is communicated with the outlet end of the pressurizer 3, and the outlet end of the pressurizer discharge pipe 20 is communicated with the feed port of the ammonia fuel engine 4; the inlet of the engine exhaust pipe 21 is communicated with the exhaust port of the ammonia fuel engine 4, and the outlet of the engine exhaust pipe 21, the outlet of the burner exhaust pipe 22, and the inlet of the mixed exhaust pipe 23 are communicated together, and the heat exchanger 2 and the exhaust gas aftertreatment device 7 are sequentially connected in series to the mixed exhaust pipe 23 along the flow direction of the mixed exhaust gas; the inlet of the ammonia main pipe 24 is communicated with the outlet of the heat exchanger 2, and the outlet of the ammonia main pipe 24, the outlet of the fourth branch pipe 29, and the inlet of the second branch pipe 26 are communicated together; the hydrogen buffer tank 6 is connected in series to the hydrogen main pipe 27, the inlet of the third branch pipe 28, the inlet of the fourth branch pipe 29, and the outlet of the hydrogen main pipe 27 are communicated together, and the outlet of the third branch pipe 28 is communicated with the pressurizer feed pipe 19; the autothermal ammonia decomposition reactor 5 includes an ammonia inlet 8, a fuel gas inlet 9, a combustion chamber 10, a reaction channel 11, a combustion exhaust gas outlet 12, a decomposed gas outlet 13, a cylinder body 14, a tube sheet 15, a spark plug 16, and an air inlet 17. The ammonia inlet 8, the fuel gas inlet 9, the combustion exhaust gas outlet 12, and the decomposed gas outlet 13 are arranged on the outer wall of the cylinder body 14. The ammonia inlet 8 and the combustion exhaust gas outlet 12 are arranged at both ends of the cylinder body 14. The fuel gas inlet 9 is close to the ammonia inlet 8, and the combustion exhaust gas outlet 12 is close to the decomposed gas outlet 13. The combustion chamber 10 and the reaction channel 11 are both arranged inside the cylinder body 14. The ammonia inlet 8 and the decomposed gas outlet 13 are respectively communicated with both ends of the reaction channel 11. One end of the combustion chamber 10 far from the fuel gas inlet 9 is open. The space formed between the fuel gas inlet 9, the combustion chamber 10 and the wall surfaces of the cylinder body 14, the tube sheet 15, and the reaction channel 11 is communicated. The reaction channel 11 is filled with a catalyst beneficial to the ammonia decomposition reaction. The spark plug 16 and the air inlet 17 are arranged on the combustion chamber 10 and close to the fuel gas inlet 9;The intake port of the burner tail gas pipe 22 is communicated with the combustion tail gas outlet 12, the intake port of the hydrogen main pipe 27 is communicated with the cracked gas outlet 13, the outlet of the second branch pipe 26 is communicated with the gas inlet 9, the intake port of the first branch pipe 25 is communicated with the ammonia main pipe 24, and the outlet of the first branch pipe 25 is communicated with the ammonia inlet 8.;

[0026] During the implementation of the present invention, the ammonia inlet 8 and the cracked gas outlet 13 are respectively communicated with both ends of the reaction channel 11. One end of the combustion chamber 10 far from the gas inlet 9 is open. The space formed among the gas inlet 9, the combustion chamber 10, the outer wall of the cylinder 14, the tube sheet 15, and the reaction channel 11 is communicated. The reaction channel 11 is filled with a catalyst conducive to the ammonia decomposition reaction, which catalyzes the decomposition of ammonia in the channel into hydrogen and nitrogen under a high-temperature environment. The used catalyst can achieve an ammonia decomposition rate of more than 90% at 400 °C.

[0027] The ammonia supplied from the ammonia storage tank 1 is divided into three paths. The first path is pressurized to 3 MPa by the pressure booster 3 and then enters the ammonia fuel engine 4 as the main fuel in the engine for combustion to provide power. The second path is vaporized and preheated through the heat exchanger 2 and then enters the ammonia inlet 8 of the autothermal ammonia decomposition reactor 5, where an ammonia decomposition reaction occurs in the autothermal ammonia decomposition reactor 5 to convert into hydrogen to provide hydrogen for the subsequent system components. The third path is also vaporized and preheated through the heat exchanger 2 and then enters the gas inlet 9 of the autothermal ammonia decomposition reactor 5 as the main fuel for combustion in the combustion chamber 10 to continuously supply heat for the ammonia decomposition hydrogen production reaction.

[0028] The heat exchanger 2 is a shell-and-tube heat exchanger. The overall length of the device is 600 mm, the diameter is 300 mm, and there are strengthening heat transfer measures such as baffle plates inside. Ammonia flows in the internal cylindrical tube bundle, is vaporized and preheated to a certain temperature. The tail gas is inside the shell and flows along the outer wall of the tube bundle to preheat the ammonia in the tube.

[0029] The mixed tail gas led out from the ammonia fuel engine 4 and the combustion tail gas outlet 12 passes through the heat exchanger 2 and the tail gas post-treatment device 7 in sequence and is directly discharged into the atmosphere. The tail gas post-treatment device 7 mainly removes gases such as NO x , N2O, and NH3.

[0030] The ammonia inlet 8 is close to the gas inlet 9, the combustion tail gas outlet 12 is close to the cracked gas outlet 13, and baffle plates are provided in the gas part to increase the high-temperature gas flow path to fully heat the reaction channel with the gas.

[0031] The pipes connecting the external ammonia inlet 8 and the combustion tail gas outlet 12 and the outside of the autothermal ammonia decomposition reactor 5 are all coated with cotton thermal insulation materials to reduce heat loss.

[0032] The gas inlet 9 is filled with a mixture of ammonia and hydrogen. Hydrogen serves as the pilot fuel for ammonia, and the energy ratio of ammonia to hydrogen is controlled between 8:1 and 7:3. There are a spark plug 16 and an air inlet 17 near the gas inlet 9.

[0033] The reaction channels 11 are 316L stainless steel tubes with a length of 500 mm, an inner diameter of 30 mm, and a wall thickness of 3 mm. There are 17 in total. The included angle between the connecting lines of the centers of the cross-sections of adjacent tubes and the center of the cross-section of the cylinder 14 is 18°. Starting from the bottom of the reactor, they are symmetrically distributed on both sides inside the cylinder 14. Catalyst units are arranged inside the reaction channels 11. The catalyst units are small cylindrical segments with an outer diameter slightly smaller than the inner diameter of the reaction channels 11. The cross-section is in a honeycomb-like shape, made of cordierite, and the inner surface is coated with an Ru-based catalytic material that is beneficial to the ammonia decomposition to hydrogen reaction.

[0034] The decomposed gas discharged from the decomposed gas outlet 13, with hydrogen as the main component, is divided into two paths. One path sequentially passes through the hydrogen buffer tank 6 and the pressure booster 3 and then enters the ammonia fuel engine 4, serving as the pilot fuel to ignite ammonia during the starting stage and increasing the combustion temperature during the subsequent combustion process to improve the combustion performance of the blended fuel. The other path passes through the hydrogen buffer tank 6 and then enters the gas inlet 9, serving as the pilot fuel to optimize the combustion process in the combustion chamber 10 of the self-heating ammonia decomposition reactor 5.

[0035] There is a small amount of hydrogen stored in the hydrogen buffer tank 6 before the system starts working, which is used for the hydrogen supply demand during the cold start of the system and the dynamic response demand during the operation process. When the hydrogen amount in the hydrogen buffer tank 6 is lower than the threshold, the ammonia supply amount and combustion power of the self-heating ammonia decomposition reactor 5 are increased, and the hydrogen produced in excess of the combustion demand is temporarily stored in the hydrogen buffer tank 6. After the ammonia fuel engine 4 stops working, the waste heat of the self-heating ammonia decomposition reactor 5 can still support the ammonia decomposition reaction for a period of time, and the hydrogen produced at this time is stored in the hydrogen buffer tank 6.

[0036] To simplify the system, and since nitrogen and ammonia have little impact on the subsequent storage and combustion processes, the nitrogen and a very small amount of unreacted ammonia in the decomposed gas are not separated and enter the hydrogen buffer tank 6 together with hydrogen.

[0037] The above are only the preferred embodiments of the present invention. Any equivalent changes and modifications made by those skilled in the art within the scope of the patent application of the present invention also fall within the scope covered by the appended claims of the present invention.

Claims

1. A self-heating ammonia decomposition hydrogen production system applied to a mobile terminal, comprising an ammonia storage tank (1), characterized in that: The invention also comprises a heat exchanger (2), a pressurizer (3), an ammonia fuel engine (4), a self-heating ammonia decomposition reactor (5), a hydrogen buffer tank (6), an exhaust gas post-treatment device (7), an ammonia inlet (8), a fuel gas inlet (9), a combustion chamber (10), a reaction channel (11), a combustion exhaust gas outlet (12), a decomposition gas outlet (13), a cylinder (14), a tube sheet (15), a spark plug (16), an air inlet (17), an ammonia storage tank discharge pipe (18), a pressurizer feed pipe (19), a pressurizer discharge pipe (20), an engine exhaust pipe (21), a burner exhaust pipe (22), a mixed exhaust pipe (23), an ammonia main pipe (24), a first branch pipe (25), a second branch pipe (26), a hydrogen main pipe (27), a third branch pipe (28), and a fourth branch pipe (29); The inlet end of the ammonia storage tank discharge pipe (18) is connected to the outlet of the ammonia storage tank (1), and the outlet end of the ammonia storage tank discharge pipe (18) is connected to the feed port of the heat exchanger (2); one end of the pressurizer feed pipe (19) is connected to the ammonia storage tank discharge pipe (18), and the other end of the pressurizer feed pipe (19) is connected to the feed port of the pressurizer (3); the inlet end of the pressurizer discharge pipe (20) is connected to the outlet end of the pressurizer (3), and the outlet end of the pressurizer discharge pipe (20) is connected to the feed port of the ammonia fuel engine (4); the air inlet of the engine tail pipe (21) is connected to the exhaust port of the ammonia fuel engine (4), and the air outlet of the engine tail pipe (21) and the burner tail pipe (22) are connected to the ammonia fuel engine (4). The outlet of the exhaust pipe (23) and the inlet of the mixed exhaust pipe (23) are connected together, and the heat exchanger (2) and the exhaust post-treatment device (7) are connected in series to the mixed exhaust pipe (23) in the direction of the mixed exhaust gas flow; the inlet of the ammonia main pipe (24) is connected to the discharge port of the heat exchanger (2), and the outlet of the ammonia main pipe (24), the outlet of the fourth branch pipe (29), and the inlet of the second branch pipe (26) are connected together; the hydrogen buffer tank (6) is connected in series to the hydrogen main pipe (27), the inlet of the third branch pipe (28), the inlet of the fourth branch pipe (29), and the outlet of the hydrogen main pipe (27) are connected together, and the outlet of the third branch pipe (28) is connected to the pressurizer feed pipe (19); The self-heating ammonia decomposition reactor (5) comprises an ammonia inlet (8), a fuel gas inlet (9), a combustion chamber (10), a reaction channel (11), a combustion tail gas outlet (12), a decomposition gas outlet (13), a cylinder (14), a tube sheet (15), a spark plug (16), and an air inlet (17). The ammonia inlet (8), the fuel gas inlet (9), the combustion tail gas outlet (12), and the decomposition gas outlet (13) are arranged on the outer wall of the cylinder (14). The ammonia inlet (8) and the combustion tail gas outlet (12) are arranged at both ends of the cylinder (14). The fuel gas inlet (9) is close to the ammonia inlet (8), and the combustion tail gas outlet (12) is close to the combustion tail gas outlet (13). The combustion chamber (10) and the reaction channel (11) are arranged inside the cylinder (14) near the decomposition gas outlet (13); the ammonia inlet (8) and the decomposition gas outlet (13) are respectively connected to the two ends of the reaction channel (11); the end of the combustion chamber (10) away from the gas inlet (9) is open; the gas inlet (9), the combustion chamber (10) and the space formed between the cylinder (14), the tube sheet (15) and the wall of the reaction channel (11) are connected; the reaction channel (11) is filled with a catalyst that is beneficial to the ammonia decomposition reaction; the spark plug (16) and the air inlet (17) are arranged on the combustion chamber (10) and near the gas inlet (9); The air inlet of the burner tail gas pipe (22) is connected to the combustion tail gas outlet (12), the air inlet of the hydrogen main pipe (27) is connected to the decomposition gas outlet (13), the air outlet of the second branch pipe (26) is connected to the fuel gas inlet (9), the air inlet of the first branch pipe (25) is connected to the ammonia main pipe (24), and the air outlet of the first branch pipe (25) is connected to the ammonia inlet (8).

2. The self-heating ammonia decomposition hydrogen production system applied to a mobile terminal according to claim 1 is characterized in that The heat exchanger (2) is a shell and tube heat exchanger with a baffle tube inside. The overall length of the device is 600 mm and the diameter is 300 mm.

3. The self-heating ammonia decomposition hydrogen production system applied to a mobile terminal according to claim 1 is characterized in that The fuel gas inlet (9) contains a mixture of ammonia and hydrogen, with hydrogen serving as a pilot fuel for ammonia. The energy ratio of ammonia to hydrogen is controlled within a range of 8:1 to 7:

3.

4. The self-heating ammonia decomposition hydrogen production system applied to a mobile terminal according to claim 1 is characterized in that The reaction channel (11) is a 316L stainless steel tube with a length of 500 mm, an inner diameter of 30 mm and a wall thickness of 3 mm. There are 17 of them in total. The angle between the line connecting the center of the cross section of two adjacent tubes and the center of the cross section of the cylinder (14) is 18°. Starting from the bottom of the reactor, the two sides are symmetrically distributed in the cylinder (14). A catalyst unit is arranged in the reaction channel (11). The catalyst unit is a cylindrical small section with an outer diameter slightly smaller than the inner diameter of the reaction channel (11). The cross section is honeycomb-shaped and made of cordierite. The inner surface is coated with a Ru-based catalytic material that is beneficial to the ammonia decomposition hydrogen production reaction.

5. The self-heating ammonia decomposition hydrogen production system applied to a mobile terminal according to claim 1 is characterized in that The fuel pressure at the outlet of the pressurizer (3) is 3 MPa.

6. The self-heating ammonia decomposition hydrogen production system applied to a mobile terminal according to claim 1 is characterized in that The pipeline connecting the external ammonia inlet (8) and the combustion tail gas outlet (12) and the exterior of the self-heating ammonia decomposition reactor (5) are both covered with cotton insulation material.

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