A high-frequency inductance ammonia cracking device and control method

Abstract

The present invention discloses a high-frequency inductance ammonia cracking device and a control method: an ammonia cracking reaction inner tank, with an ammonia gas input end and a cracked gas output end respectively provided at both ends, and an ammonia cracking catalyst is filled inside the ammonia cracking reaction inner tank; a high-frequency inductance heating coil, wound around the periphery of the ammonia cracking reaction inner tank, and the high-frequency inductance heating coil is used to achieve high-frequency inductance heating with the ammonia cracking reaction inner tank as the magnetic core; a coil length control component, including a front end cover, a movable end cover and a coil length driving member, and both ends of the high-frequency inductance heating coil are respectively connected to the front end cover and the movable end cover. Through the above structure, the high-frequency alternating magnetic field distribution is efficiently adjusted, the amount of the ammonia cracking catalyst loaded on the metal foam in the ammonia cracking reaction inner tank is changed, and the parameters of the ammonia gas flow regulating electric control valve are correspondingly adjusted. The present invention can achieve the ammonia cracking required for the cold start of an ammonia internal combustion engine, and can dynamically adjust the hydrogen production according to different working conditions of the ammonia internal combustion engine.

Description

Technical Field

[0001] The present invention relates to the field of energy-saving and new energy vehicles, and particularly relates to a high-frequency inductive ammonia cracking device and a control method therefor. Background Art

[0002] As a zero-carbon fuel, ammonia can be used in an ammonia internal combustion engine to drive a piston to do work. However, ammonia is difficult to ignite, so hydrogen needs to be introduced into the cylinder of the ammonia internal combustion engine to assist combustion. The ammonia cracking hydrogen production technology can effectively crack ammonia to produce hydrogen at a certain reaction temperature with the assistance of an ammonia cracking catalyst. Therefore, in a transportation device, only one raw material, ammonia, needs to be loaded to achieve stable combustion of ammonia doped with hydrogen in the cylinder of the ammonia internal combustion engine, thereby driving the vehicle to move.

[0003] However, problems such as how to meet the rapid cold start requirement of the ammonia cracker, how to meet the different hydrogen demand amounts under complex operating conditions, how to achieve efficient energy utilization, how to achieve efficient ammonia cracking, how to meet the long-term stable operation requirement of the cracker, and how to prepare high-pressure ammonia cracking gas restrict the development of ammonia-hydrogen integrated transportation equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-frequency inductive ammonia cracking device and a control method therefor, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0005] Technical solutions adopted to solve the above technical problems:

[0006] The present invention provides a high-frequency inductive ammonia cracking device, comprising:

[0007] An ammonia cracking reaction inner tank, with an ammonia gas input end and a cracked gas output end provided at both ends respectively. The inside of the ammonia cracking reaction inner tank is filled with an ammonia cracking catalyst, and the ammonia cracking reaction inner tank is a metal component;

[0008] A high-frequency inductive heating coil, wound around the periphery of the ammonia cracking reaction inner tank, and the high-frequency inductive heating coil is used to achieve high-frequency inductive heating with the ammonia cracking reaction inner tank as a magnetic core;

[0009] A coil length regulating component, including a front end cover, a movable end cover and a coil length driving member. Both ends of the high-frequency inductive heating coil are respectively connected to the front end cover and the movable end cover, and the coil length driving member is used to drive the front end cover and / or the movable end cover to move axially along the ammonia cracking reaction inner tank.

[0010] The beneficial effects of the present invention are:

[0011] The high-frequency inductive heating coil can be compressed or stretched in the axial direction of the ammonia cracking reaction inner cylinder, changing the shape of the high-frequency alternating magnetic field, so as to heat the ammonia cracking reaction inner cylinders with different lengths and different amounts of ammonia cracking catalysts inside the magnetic field. Under cold start conditions, the high-frequency inductive heating coil can be compressed and concentrate the heating on the ammonia cracking catalyst in a partial ammonia cracking reaction inner cylinder. This part of the metal foam loaded with ammonia cracking catalyst can be instantaneously heated to a relatively high first temperature. During the warm-up process after cold start, in order to extend the service life of the metal foam loaded with ammonia cracking catalyst, the high-frequency inductive heating coil can be stretched and uniformly heat the ammonia cracking catalyst in the entire ammonia cracking reaction inner cylinder, heating it to a relatively low second temperature. In this way, during the entire cold start - warm-up process, the device can efficiently crack a large flow of ammonia into hydrogen and nitrogen, while not only meeting the ultra-fast cold start requirements of the on-vehicle ammonia reforming system of ammonia internal combustion engines, but also maximizing the avoidance of the problem of ammonia cracking catalyst aging. The structure of the ammonia cracking reaction inner cylinder can be a high-pressure-resistant stainless steel cylinder body, which is conducive to realizing high-pressure ammonia cracking. The hydrogen-nitrogen mixed gas can be directly transported to the intake rail of the ammonia internal combustion engine, avoiding the need for an additional gas booster and significantly improving the system integration and economy.

[0012] As a further improvement of the above technical solution, one end of the high-frequency inductive heating coil is fixed to the front end cover, and the other end of the high-frequency inductive heating coil is fixed to the movable end cover. Only driving the movement of the movable end cover is simple in structure, convenient to drive, and meets the dynamic adjustment requirements of the high-frequency inductive heating coil.

[0013] As a further improvement of the above technical solution, the high-frequency inductive ammonia cracking device includes: an inductive power regulation component, which includes a fixed electrical contact, a movable electrical contact, and a regulation driving member. The fixed electrical contact is electrically connected to one end of the high-frequency inductive heating coil, the movable electrical contact is in electrical contact with the outer circumference of the high-frequency inductive heating coil, and the regulation driving member is used to drive the movable electrical contact to move along the axial direction of the ammonia cracking reaction inner cylinder.

[0014] Both the movable electrical contact and the fixed electrical contact are externally connected to an inductive heating power supply. By moving the movable electrical contact, the number of turns of the high-frequency inductive heating coil participating in inductive heating is changed, heating different amounts of metal foam loaded with ammonia cracking catalyst in the ammonia cracking reaction inner cylinder, for generating hydrogen-nitrogen mixed cracking gas with dynamically adjustable flow rate.

[0015] As a further improvement of the above technical solution, the movable electrical contact includes an elastic contact structure that elastically abuts against and is in electrical contact with the outer circumference of the high-frequency inductive heating coil, so that while changing the number of turns of the high-frequency inductive heating coil, the movable electrical contact is in good contact with the high-frequency inductive heating coil.

[0016] As a further improvement of the above technical solution, the movable electrical contact also includes a conductive rail and an inductive power regulating slider, the conductive rail is located beside the axis of the high-frequency inductive heating coil, the inductive power regulating slider is slidably arranged on the conductive rail, the regulating drive is used to drive the inductive power regulating slider to move axially along the ammonia cracking reaction inner tank, and the elastic contact structure is arranged on the inductive power regulating slider.

[0017] In this solution, the inductor power control slider can move along the conductive rail between the front end cover and the movable end cover according to the different hydrogen requirements of the cylinder, thereby changing the number of turns of the high-frequency induction heating coil involved in induction heating. The inductor power control slider and the conductive rail are set to improve the movement stability.

[0018] As a further improvement of the above technical solution, the movable end cover is also equipped with a limit baffle that abuts against the inductor power control slider, so that the movable end cover pushes the inductor power control slider to move together, thereby improving the synchronization of the movement of the inductor power control slider and the movable end cover.

[0019] As a further improvement of the above technical solution, the inductor power control slider includes a motor insulation support frame, a conductive sliding platform, a conductive bow, a spring, and an elastic conductive plate;

[0020] The motor insulation support frame is fixedly connected to the conductive sliding platform, the conductive sliding platform is straddled on the conductive rail, an elastic conductive plate is installed in the conductive sliding platform, and a conductive bow and a spring are installed on the side of the conductive sliding platform close to the high-frequency induction heating coil;

[0021] The elastic conductive plate is closely fitted with the conductive rail, and the spring supports the conductive pantograph so that it is closely fitted with the high-frequency induction heating coil;

[0022] The elastic conductive plate, the conductive bow, the conductive rail and the high-frequency inductive heating coil constitute a conductive path.

[0023] The spring in this solution can ensure that the conductive bow is always in good contact with the high-frequency induction heating coil, and the elastic conductive plate can ensure that the conductive sliding platform is in good contact with the conductive rail, both of which improve the operating reliability of the device.

[0024] As a further improvement of the above technical solution, the coil length driving member includes a rear end cover, at least one screw rod, and a screw rod driving motor;

[0025] The screw is rotatably arranged on the front end cover, the screw is threadedly connected with the movable end cover, the screw drive motor is arranged on the rear end cover, and the output shaft of the screw drive motor is drivingly connected with the screw.

[0026] In this solution, multiple lead screws are respectively connected to their own driven gears and are uniformly driven by a single driving gear, ensuring the consistency of the movement of multiple lead screws and further increasing the movement stability of the high-frequency inductive heating coil during the compression and stretching processes. There is a small transmission ratio between the driving gear and the driven gears, enabling fast lead screw transmission and thus enhancing the rapid response ability of the device.

[0027] As a further improvement of the above technical solution, the ammonia input end is directly connected to the ammonia cracking reaction inner tank; the cracked gas output end is located near the rear end cover and is directly connected to the ammonia cracking reaction inner tank; the inner diameter of the pipeline of the cracked gas output end is larger than that of the pipeline of the ammonia input end.

[0028] The fact that the inner diameter of the pipeline of the cracked gas output end of this solution is larger than that of the pipeline of the ammonia input end can avoid the increase of gas back pressure in the ammonia cracking reaction, enhancing the operation reliability and safety of the device.

[0029] The present invention also provides a control method for a high-frequency inductive ammonia cracking device, which uses a high-frequency inductive ammonia cracking device as described in any one of the above.

[0030] When the ammonia internal combustion engine is in the cold start condition, the specific electronic control method is as follows:

[0031] To meet the reliable ignition requirements of the ammonia internal combustion engine, a relatively high amount of hydrogen is required at this time;

[0032] Turn on the coil length driving member so that the coil length driving member drives the movable end cover and the movable electrical contact member to move towards the front end cover direction, causing the high-frequency inductive heating coil to be energized, and then enabling the ammonia cracking catalyst corresponding to a section of the ammonia cracking reaction inner tank wrapped with the high-frequency inductive heating coil to be instantaneously concentratedly heated to the first temperature; at the same time, control the increase of the ammonia gas flow rate input into the ammonia cracking reaction inner tank, and then generate a relatively large flow rate of hydrogen-nitrogen mixed cracked gas;

[0033] After the ammonia internal combustion engine is started, the specific electronic control method is as follows:

[0034] Make the coil length driving member drive the movable end cover to move away from the front end cover direction, and at the same time make the regulation driving member correspondingly drive the movable electrical contact member to move away from the front end cover direction, stretching the high-frequency inductive heating coil so that the high-frequency inductive heating coil completely covers the entire ammonia cracking reaction inner tank; at the same time, continue to control the input of a relatively large flow rate of ammonia gas and continue to generate a relatively large flow rate of hydrogen-nitrogen mixed cracked gas;

[0035] After the ammonia internal combustion engine is started, under different working conditions, adjust the hydrogen demand, and the specific electronic control method is as follows:

[0036] Keep the high-frequency inductive heating coil in a state of completely covering the entire ammonia cracking reaction inner liner. At this time, control the movable electrical contact to move axially along the ammonia cracking reaction inner liner between the front end cover and the movable end cover according to the hydrogen demand of different cylinders, so as to change the number of turns of the high-frequency inductive heating coil participating in inductive heating, and heat different amounts of ammonia cracking catalyst in the ammonia cracking reaction inner liner to a lower second temperature; at the same time, by regulating the input amount of ammonia gas, a hydrogen-nitrogen mixed cracking gas with dynamically adjustable flow rate is generated.

[0037] The high-frequency inductive heating coil can be compressed or stretched. Under cold start conditions, after being compressed, the high-frequency inductive heating coil can concentrate heat the metal foam-supported ammonia cracking catalyst in a local ammonia cracking reaction inner liner to a higher first temperature; during the warm-up process after cold start, the high-frequency inductive heating coil can be stretched and evenly heat the metal foam-supported ammonia cracking catalyst in the entire ammonia cracking reaction inner liner to a lower second temperature to extend the service life of the catalyst. In this way, the device can efficiently crack a large flow of ammonia gas into hydrogen and nitrogen, while meeting the requirements of ultra-fast cold start and avoiding the problem of catalyst aging to the greatest extent. The high-pressure-resistant stainless steel ammonia cracking reaction body is conducive to realizing high-pressure ammonia cracking, and the hydrogen-nitrogen mixed gas can be directly transported to the intake rail of the ammonia internal combustion engine, significantly improving the system integration and economy. The movable electrical contact can change the number of turns of the high-frequency inductive heating coil participating in inductive heating according to different hydrogen demands, heat different amounts of metal foam-supported ammonia cracking catalyst and generate a hydrogen-nitrogen mixed cracking gas with dynamically adjustable flow rate. Brief Description of the Drawings

[0038] The following further describes the present invention in conjunction with the drawings and embodiments;

[0039] Figure 1 is a schematic structural diagram of the high-frequency inductive ammonia cracking device provided by the present invention;

[0040] Figure 2 is a schematic structural diagram of the inductive power regulation slider inside the high-frequency inductive ammonia cracking device provided by the present invention;

[0041] Figure 3 is a schematic cross-sectional structural diagram of the high-frequency inductive ammonia cracking device provided by the present invention;

[0042] Figure 4 is a schematic diagram of the movement of the movable end cover of the high-frequency inductive ammonia cracking device under cold start conditions;

[0043] Figure 5 is a schematic diagram of the movement of the movable end cover and the inductive power regulation slider of the high-frequency inductive ammonia cracking device under warm-up and different working conditions. Detailed Embodiments

[0044] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0045] In the description of the present invention, it should be understood that with regard to the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention.

[0046] In the description of the present invention, if there are words such as "several" for description, its meaning is one or more, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number.

[0047] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0048] Refer to Figures 1 to 5 , the following embodiments are made for the high-frequency inductance ammonia cracking device of the present invention:

[0049] As Figure 1 shown, the dynamically adjustable high-frequency inductance ammonia cracking device includes an ammonia cracking reaction inner tank 2, a high-frequency inductance heating coil 1, and a coil length control component. The ammonia cracking reaction inner tank has an ammonia input end and a cracked gas output end 22 at both ends respectively; the high-frequency inductance heating coil 1 is wound around the periphery of the ammonia cracking reaction inner tank 2, and the high-frequency inductance heating coil 1 is used to heat the ammonia cracking reaction inner tank 2. The ammonia cracking reaction inner tank 2 is a metal component and serves as the magnetic core of the high-frequency inductance heating coil 1; the coil length driving member is used to drive the movable end cover 3 to move in the axial direction of the ammonia cracking reaction inner tank 2. The coil length control component includes a front end cover 4, a movable end cover 3, and a coil length driving member.

[0050] Specifically, the interior of the ammonia cracking reaction inner container 2 is filled with ammonia cracking catalyst, and the ammonia cracking reaction inner container 2 is a metal component; the high-frequency inductive heating coil 1 is wound around the periphery of the ammonia cracking reaction inner container 2, and both ends of the high-frequency inductive heating coil 1 are respectively fixed to the front end cover 4 and the movable end cover 3. One end of the ammonia cracking reaction inner container 2 is fixedly inserted into the front end cover 4, and the other end is inserted into the movable end cover 3; the high-frequency inductive heating coil 1 can be pushed by the movable end cover 3 to move in the axial direction of the ammonia cracking reaction inner container 2, changing the shape of the high-frequency alternating magnetic field, so as to heat the ammonia cracking reaction inner container 2 with different lengths and different amounts of metal foam-supported ammonia cracking catalyst 23 inside the magnetic field. The structure of the ammonia cracking reaction inner container 2 can be a high-pressure-resistant stainless steel body, which is beneficial to realizing high-pressure ammonia cracking. The hydrogen-nitrogen mixed gas can be directly transported to the intake rail of the ammonia internal combustion engine, avoiding the need for an additional gas booster, and significantly improving the system integration and economy.

[0051] In some other embodiments, the front end cover 4 and the movable end cover 3 can also be driven to approach each other simultaneously, thereby increasing the number of turns of the inner coil per unit length to meet the rapid start-up requirement of the present invention when the ammonia internal combustion engine is in a cold start condition.

[0052] As Figure 1 shown, the dynamically adjustable high-frequency inductive ammonia cracking device further includes an inductive power regulation component, and the inductive power regulation component includes a fixed electrical contact, a movable electrical contact, and a regulation driving component. In this embodiment, the fixed electrical contact is the coil terminal 11, and the movable electrical contact includes an elastic contact structure that elastically abuts against and is in electrical contact with the outer periphery of the high-frequency inductive heating coil 1. The regulation driving component is used to drive the movable elastic contact structure to move along the axial direction of the ammonia cracking reaction inner container 2.

[0053] Specifically, the movable electrical contact includes a conductive rail 82, an inductive power regulation slider 81, and a conductive rail terminal 83, and a rear end cover 5 is also provided; one end of the conductive rail 82 is fixed to the front end cover 4, and the other end is fixed to the rear end cover 5, and it is installed above the axis of the high-frequency inductive heating coil 1. In some other embodiments, the conductive rail 82 can also be installed on the side of the axis of the high-frequency inductive heating coil 1, and the conductive rail terminal 83 is connected to the conductive rail 82 at the rear end cover 5; the inductive power regulation slider 81 can reciprocate along the conductive rail 82. The conductive rail terminal 83 and the coil terminal 11 are both externally connected to an inductive heating power supply. The inductive power regulation slider 81 can move along the conductive rail 82 between the front end cover 4 and the movable end cover 3 according to the hydrogen demand of different cylinders, so as to change the number of turns of the high-frequency inductive heating coil 1 participating in inductive heating, and heat different amounts of metal foam-supported ammonia cracking catalyst 23 in the ammonia cracking reaction inner container 2 to generate hydrogen-nitrogen mixed cracking gas with dynamically adjustable flow rate.

[0054] As Figure 2As shown in the figure, the control driving member includes a slider driving motor 811, a slider driving gear 812, and a rack 8; both ends of the rack 8 are respectively fixed on the front end cover 4 and the rear end cover 5. The rack 8 is parallel to the conductive rail 82, and tooth teeth are evenly distributed on both upper surfaces of the rack 8; there are two slider driving motors 811, which are fixed on the inductive power control slider 81 through the motor insulation support frame 813; the output shafts of the two slider driving motors 811 are respectively connected to the rotation shafts of the two slider driving gears 812, and the two slider driving gears 812 are respectively in contact with the tooth teeth on the upper and lower surfaces of the rack 8 to form a gear transmission relationship;

[0055] The inductive power control slider 81 includes a motor insulation support frame 813, a conductive sliding platform 814, and an elastic conductive plate 817. The elastic contact structure includes a conductive bow 815 and a spring 816;

[0056] The lower part of the motor insulation support frame 813 is fixedly connected to the conductive sliding platform 814. The conductive sliding platform 814 straddles the conductive rail 82. An elastic conductive plate 817 is installed in the conductive sliding platform 814, and a conductive bow 815 and a spring 816 are installed below. The elastic conductive plate 817 is in close contact with the conductive rail 82. The spring 816 supports the conductive bow 815 to make it in close contact with the high-frequency inductive heating coil 1; the elastic conductive plate 817, the conductive bow 815, the conductive rail 82, and the high-frequency inductive heating coil 1 form a conductive path. The elastic connection enables the movable electrical contact to be in good contact with the high-frequency inductive heating coil 1 while changing the number of turns of the high-frequency inductive heating coil.

[0057] The movement of the inductive power control slider 81 adopts rack drive, which can achieve high transmission efficiency and high movement accuracy, and can perform movements of any stroke length; the slider driving gear 812 is driven by the slider driving motor 811 to engage with the rack 8, so that the movement speed of the inductive power control slider 81 can be adjusted within a large range, further enhancing the fast response ability and hydrogen production capacity adaptation ability of the device; the spring 816 can ensure that the conductive bow 815 is always in good contact with the high-frequency inductive heating coil 1, and the elastic conductive plate 817 can ensure that the conductive sliding platform 814 is in good contact with the conductive rail 82. The two improve the operation reliability of the device. In some other embodiments, the control driving member can use a cylinder, an electric push rod, or a motor screw drive as the driving unit and is provided with a corresponding slide rail to improve the movement accuracy.

[0058] In some other embodiments, the control driving member can use a cylinder, an electric push rod, or a motor screw drive as the driving unit and is provided with a corresponding slide rail to improve the movement accuracy.

[0059] In some other embodiments, the elastic contact structure may be an electro-elastic sheet, which is arranged at the output end of the regulation driving member and elastically abuts and is in electrical contact with the outer periphery of the high-frequency inductive heating coil 1. It has the advantage of being not easily short-circuited, and the electro-elastic sheet is connected to an insulated wire.

[0060] As Figure 1 shown, the coil length driving member further includes a plurality of lead screw holes 32 located on the movable end cover 3 and a plurality of bearings 61 located on the front end cover 4. One end of the lead screw 6 is connected to the inner hole of the bearing 61, and its rod body penetrates through the plurality of lead screw holes 32 respectively to form a lead screw transmission relationship. The lead screw transmission is simple to control, can achieve high-precision positioning, can resist large loads and maintain the stability of transmission, has high reliability and durability. By using a plurality of lead screws 6 to jointly push the movable end cover 3, the movement smoothness of the high-frequency inductive heating coil 1 during compression and stretching can be further ensured.

[0061] As Figure 1 shown, the dynamically adjustable high-frequency inductive ammonia cracking device further includes a coupling 62, a lead screw driving motor 7, a driving gear 71, and a plurality of driven gears 72; there are a plurality of driven gears 72, and the rotating shafts of the driven gears 72 are fixed on the rear end cover 5; the driving shaft of the lead screw driving motor 7 is connected to the rotating shaft of the driving gear 71, and the driving gear 71 forms a gear transmission relationship with the plurality of driven gears 72 respectively; there is a small transmission ratio between the driving gear 71 and the driven gears 72; the other end of the lead screw 6 is connected to the plurality of driven gears 72 respectively through a plurality of couplings 62. The plurality of lead screws 6 are respectively connected to their respective driven gears 72 and are uniformly driven by one driving gear 71, which ensures the consistency of the movement of the plurality of lead screws 6 and further increases the movement smoothness of the high-frequency inductive heating coil 1 during compression and stretching. There is a small transmission ratio between the driving gear 71 and the driven gears 72, which can achieve fast lead screw transmission, thereby improving the fast response ability of the device.

[0062] As Figure 3 shown, the ammonia cracking reaction inner tank 2 is filled with an ammonia cracking catalyst, and the ammonia cracking catalyst includes a metal foam-supported ammonia cracking catalyst 23. The metal foam carrier has electrical conductivity, and the metal foam carrier has a high surface area and a porous structure, which can not only be coated with a large amount of ammonia cracking catalyst but also allow ammonia gas to flow through the porous structure to avoid the generation of high gas back pressure.

[0063] As Figure 1As shown in the figure, the dynamically adjustable high-frequency inductance ammonia cracking device further includes a heat insulation layer 9; the heat insulation layer 9 is located in the annular space between the ammonia cracking reaction inner tank 2 and the high-frequency inductance heating coil 1, and tightly wraps the outer wall of the ammonia cracking reaction inner tank 2; the material of the heat insulation layer 9 is an insulating and high-temperature resistant material such as graphite felt, ceramic fiber cotton or aluminum silicate fiber. This can avoid the heat dissipation of the ammonia cracking reaction inner tank 2, improve the energy utilization rate, and at the same time, the heat insulation layer 9 can prevent the high-frequency inductance heating coil 1 from being exposed to high-temperature thermal radiation, improving the durability of the device; the material of the heat insulation layer 9 is an insulating and high-temperature resistant material, which not only plays a heat insulation effect but also avoids the magnetic shielding effect on the internal ammonia cracking reaction tank 2. The ammonia cracking reaction inner tank 2 is also connected with an ammonia gas input end 21 and a cracked gas output end 22; the inner diameter of the pipeline of the cracked gas output end 22 is larger than the inner diameter of the pipeline of the ammonia gas input end 21. In this solution, the inner diameter of the cracked gas output end pipeline 22 being larger than the inner diameter of the ammonia gas input end pipeline 21 can avoid the increase of gas back pressure in the ammonia cracking reaction, improving the operation reliability and safety of the device. An ammonia gas flow regulating electric control valve 211 is also installed between the ammonia gas input end 21 and the ammonia cracking reaction inner tank 2. In this solution, the ammonia gas flow regulating electric control valve 211 can adjust the input amount of ammonia gas according to the different hydrogen demand of the ammonia internal combustion engine cylinder, realizing the dynamically adjustable effect of the hydrogen production amount of the device.

[0064] This embodiment also provides a control method applicable to the above-mentioned dynamically adjustable high-frequency inductance ammonia cracking device, which is as follows:

[0065] When the ammonia internal combustion engine is in the cold start condition, the specific electric control method is as follows:

[0066] To meet the reliable ignition requirement of the ammonia internal combustion engine, the hydrogen demand is relatively high at this time;

[0067] As Figure 4 shown in the figure, the lead screw drive motor 7 drives the movable end cover 3 to move towards the front end cover 4, squeezing the high-frequency inductance heating coil 1, so that the number of turns of the high-frequency inductance heating coil 1 per unit length outside the ammonia cracking reaction inner tank 2 near the front end cover 4 increases. During the movement of the movable end cover 3 towards the front end cover 4, the limit baffle 31 closely adheres to the inductance power control slider 81 and pushes it to move together;

[0068] A high-frequency current is passed through the high-frequency inductance heating coil 1 through the coil terminal 11 and the conductive rail terminal 83. At this time, the current will flow through the entire high-frequency inductance heating coil 1, and a high-frequency alternating magnetic field will be formed at a section of the ammonia cracking reaction inner tank 2 near the front end cover 4. Inductive eddy currents will be generated in the metal wall of this section of the ammonia cracking reaction inner tank 2 and a part of the metal foam loaded ammonia cracking catalyst 23 in this section of the ammonia cracking reaction inner tank 2. Since the entire high-frequency inductance heating coil 1 only focuses on heating a part of the ammonia cracking reaction inner tank 2 and the metal foam loaded ammonia cracking catalyst 23 therein, this part of the metal foam loaded ammonia cracking catalyst 23 will be instantaneously heated to a relatively high first temperature;

[0069] Meanwhile, the ammonia flow regulating electronic control valve 211 controls the input of a large flow of ammonia. The ammonia gas flows through the metal foam supported ammonia cracking catalyst 23 that is heated to a relatively high first temperature. At this time, although the mass of the heated metal foam supported ammonia cracking catalyst 23 is small, due to the relatively high cracking temperature, high-efficiency cracking of ammonia to produce hydrogen can still be achieved, thereby generating a large flow of hydrogen-nitrogen mixed cracking gas.

[0070] To meet the heat engine demand for a period of time after the ammonia internal combustion engine is ignited, the hydrogen demand is still relatively high at this time. Although a small mass of the metal foam supported ammonia cracking catalyst 23 can crack a large amount of ammonia to produce a large amount of hydrogen-nitrogen mixed cracking gas at a relatively high first temperature, long-term operation of the metal foam supported ammonia cracking catalyst 23 at a relatively high first temperature will cause accelerated aging of the catalyst. Therefore, in order to produce a large flow of hydrogen-nitrogen mixed cracking gas and avoid catalyst aging, after the ammonia internal combustion engine is started, the specific electronic control method is as follows:

[0071] As Figure 5 shown, the lead screw drive motor 7 drives the movable end cover 3 to move towards the rear end cover 5, stretching the high-frequency inductive heating coil 1, so that the high-frequency inductive heating coil 1 completely covers the entire ammonia cracking reaction inner tank 2, and a high-frequency alternating magnetic field is formed inside the entire ammonia cracking reaction inner tank 2, causing induced eddy currents to be generated in the metal wall of the entire ammonia cracking reaction inner tank 2 and all the metal foam supported ammonia cracking catalysts 23. Since the heating object of the high-frequency inductive heating coil 1 increases at this time, the temperature of all the metal foam supported ammonia cracking catalysts 23 will reach a relatively low second temperature;

[0072] Meanwhile, the ammonia flow regulating electronic control valve 211 continues to control the input of a large flow of ammonia. The ammonia gas flows through all the metal foam supported ammonia cracking catalysts 23 with a relatively low second temperature. At this time, although the cracking temperature is relatively low, due to the large mass of the metal foam supported ammonia cracking catalysts 23 participating in the ammonia cracking reaction, high-efficiency cracking of ammonia to produce hydrogen can still be achieved, thereby generating a large flow of hydrogen-nitrogen mixed cracking gas.

[0073] After the ammonia internal combustion engine is started, under different working conditions, its cylinder has different hydrogen demands. For example, under heavy load and high speed working conditions, the hydrogen demand of the cylinder is relatively high, while under light load and low speed working conditions, the hydrogen demand of the cylinder is relatively low. According to the different hydrogen demands, the specific electronic control method is as follows:

[0074] The high-frequency inductive heating coil 1 remains completely covering the entire ammonia cracking reaction inner tank 2. At this time, according to the hydrogen demand of different cylinders, the inductive power control slider 81 can move along the conductive rail 82 between the front end cover 4 and the movable end cover 3, thereby changing the number of turns of the high-frequency inductive heating coil 1 participating in inductive heating, so that different amounts of metal foam loaded with ammonia cracking catalyst 23 in the ammonia cracking reaction inner tank 2 are heated to a lower second temperature;

[0075] At the same time, the ammonia flow regulating electronic control valve 211 regulates the input amount of ammonia. When a larger amount of metal foam loaded with ammonia cracking catalyst 23 is heated to a lower second temperature, the input amount of ammonia is higher; when a smaller amount of metal foam loaded with ammonia cracking catalyst 23 is heated to a lower second temperature, the input amount of ammonia is lower, thereby generating a hydrogen-nitrogen mixed cracking gas with dynamically adjustable flow rate.

[0076] In summary, the high-frequency inductive heating coil 1 can be compressed or stretched. Under cold start conditions, after being compressed, the high-frequency inductive heating coil 1 can concentrate the heating of the metal foam-supported ammonia cracking catalyst 23 in the local ammonia cracking reaction inner cylinder 2 to a relatively high first temperature; during the warm-up process after cold start, the high-frequency inductive heating coil 1 can be stretched and uniformly heat the metal foam-supported ammonia cracking catalyst 23 in the entire ammonia cracking reaction inner cylinder 2 to a relatively low second temperature to extend the service life of the catalyst. In this way, the device can efficiently crack a large flow of ammonia into hydrogen and nitrogen, while meeting the requirements of ultra-fast cold start and maximizing the avoidance of catalyst aging problems. The high-pressure-resistant stainless steel ammonia cracking reaction body 2 is conducive to realizing high-pressure ammonia cracking, and the hydrogen-nitrogen mixture gas can be directly transported to the intake rail of the ammonia internal combustion engine, significantly improving the system integration and economy. The inductive power regulation slider 81 can change the number of turns of the high-frequency inductive heating coil 1 participating in inductive heating according to different hydrogen demands, heat different amounts of the metal foam-supported ammonia cracking catalyst 23, and generate a hydrogen-nitrogen mixed cracking gas with dynamically adjustable flow rate. The movement of the movable end cover 3 adopts a lead screw drive, which is simple to control, has a high positioning accuracy, can maintain the transmission stability, and has high reliability and durability. Multiple lead screws 6 together push the movable end cover 3 to ensure the movement stability of the high-frequency inductive heating coil 1 during compression and stretching. Multiple lead screws 6 are uniformly driven by a driving gear 71 to ensure the movement consistency and increase the movement stability of the high-frequency inductive heating coil 1 during compression and stretching. There is a small transmission ratio between the driving gear 71 and the driven gear 72, which can realize a fast lead screw drive and improve the fast response ability of the device. The movement of the inductive power regulation slider 81 adopts a rack drive, which can achieve high transmission efficiency and high movement accuracy, and can perform movements of any stroke length; the slider driving gear 812 is driven by the slider driving motor 811 to engage with the rack 8, so that the movement speed of the inductive power regulation slider 81 can be adjusted within a large range, enhancing the fast response ability and hydrogen production capacity adaptation ability of the device; the spring 816 can ensure that the pantograph 815 is always in good contact with the high-frequency inductive heating coil 1, and the elastic conductive plate 817 can ensure that the conductive sliding platform 814 is in good contact with the conductive rail 82, and the two improve the operation reliability of the device. The metal foam carrier has electrical conductivity, and the metal foam carrier has a high surface area and a porous structure, which can not only be coated with a large amount of ammonia cracking catalyst, but also allow ammonia to flow through the porous structure to avoid the generation of high gas back pressure. The heat insulation layer 9 can avoid the heat dissipation of the ammonia cracking reaction inner cylinder 2, improve the energy utilization rate, and at the same time the heat insulation layer 9 can avoid the high-temperature thermal radiation on the high-frequency inductive heating coil 1, improving the durability of the device; the material of the heat insulation layer 9 is an insulating and high-temperature-resistant material, which not only plays a heat insulation effect but also avoids the magnetic shielding effect on the internal ammonia cracking reaction body 2. The inner diameter of the pipeline at the cracking gas output end 22 is larger than the inner diameter of the pipeline at the ammonia input end 21, which can avoid the increase of gas back pressure in the ammonia cracking reaction and improve the operation reliability and safety of the device.The ammonia flow regulating electronic control valve 211 can adjust the input amount of ammonia according to the different hydrogen requirements of the ammonia internal combustion engine cylinder, achieving the dynamic adjustable effect of the hydrogen production amount of the device.

[0077] The above has specifically described the preferred embodiments of the present invention. However, the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention. These equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A high-frequency inductance ammonia cracking device, characterized in that, Comprising: An ammonia cracking reaction inner tank, with an ammonia input end and a cracked gas output end respectively provided at both ends. The inside of the ammonia cracking reaction inner tank is filled with an ammonia cracking catalyst, and the ammonia cracking reaction inner tank is a metal component; A high-frequency inductive heating coil, wound around the periphery of the ammonia cracking reaction inner tank, and the high-frequency inductive heating coil is used to achieve high-frequency inductive heating with the ammonia cracking reaction inner tank as the magnetic core; A coil length regulation component, including a front end cover, a movable end cover, and a coil length driving member. Both ends of the high-frequency inductive heating coil are respectively connected to the front end cover and the movable end cover, and the coil length driving member is used to drive the front end cover and / or the movable end cover to move axially along the ammonia cracking reaction inner tank; An inductive power regulation component, including a fixed electrical contact, a movable electrical contact, and a regulation driving member. The fixed electrical contact is electrically connected to one end of the high-frequency inductive heating coil, the movable electrical contact is in electrical contact with the outer periphery of the high-frequency inductive heating coil, and the regulation driving member is used to drive the movable electrical contact to move axially along the ammonia cracking reaction inner tank.

2. The high-frequency inductive ammonia cracking device according to claim 1, wherein: One end of the high-frequency inductive heating coil is fixed to the front end cover, and the other end of the high-frequency inductive heating coil is fixed to the movable end cover.

3. The high-frequency inductive ammonia cracking device according to claim 1, wherein: The movable electrical contact includes an elastic contact structure that elastically abuts against and is in electrical contact with the outer periphery of the high-frequency inductive heating coil.

4. The high-frequency inductive ammonia cracking device according to claim 3, wherein: The movable electrical contact further includes a conductive rail and an inductive power regulation slider. The conductive rail is located beside the axis of the high-frequency inductive heating coil. The inductive power regulation slider is slidably arranged on the conductive rail. The regulation driving member is used to drive the inductive power regulation slider to move axially along the ammonia cracking reaction inner tank, and the elastic contact structure is arranged on the inductive power regulation slider.

5. The high-frequency inductive ammonia cracking device according to claim 4, wherein: The inductive power regulation slider includes a motor insulation support frame, a conductive sliding platform, and an elastic conductive plate. The elastic contact structure includes a conductive bow and a spring; The motor insulation support frame is fixedly connected to the conductive sliding platform. The conductive sliding platform straddles the conductive rail. An elastic conductive plate is installed inside the conductive sliding platform. A conductive bow and a spring are installed on one side of the conductive sliding platform close to the high-frequency inductive heating coil; The elastic conductive plate is in close fit with the conductive rail, and the spring supports the conductive bow to make it in close fit with the high-frequency inductive heating coil; The elastic conductive plate, the conductive bow, the conductive rail, and the high-frequency inductive heating coil form a conductive path.

6. The high-frequency inductive ammonia cracking device according to claim 4, wherein: A limit baffle that abuts against the inductive power regulation slider is further installed on the movable end cover, so that the movable end cover pushes the inductive power regulation slider to move together.

7. The high-frequency inductive ammonia cracking device according to claim 2, wherein: The coil length driver includes a rear end cover, at least one lead screw, and a lead screw driving motor; The lead screw is rotatably arranged on the front end cover. The lead screw is in threaded connection with the movable end cover. The lead screw driving motor is arranged on the rear end cover, and the output shaft of the lead screw driving motor is in transmission connection with the lead screw.

8. The high-frequency inductive ammonia cracking device according to claim 1, wherein: The ammonia input end is directly connected to the ammonia cracking reaction inner tank; The cracked gas output end is near the rear end cover and is directly connected to the ammonia cracking reaction inner tank; The inner diameter of the pipeline of the cracked gas output end is larger than the inner diameter of the pipeline of the ammonia input end.

9. A control method for a high-frequency inductive ammonia cracking device, characterized in that: It adopts a high-frequency inductive ammonia cracking device as described in any one of claims 1 to 8, When the ammonia internal combustion engine is in the cold start condition, the specific electronic control method is as follows: To meet the reliable ignition requirement of the ammonia internal combustion engine, a relatively high amount of hydrogen is required at this time; Turn on the coil length driver so that the coil length driver drives the movable end cover and the movable electrical contact member to move towards the front end cover, causing the high-frequency inductive heating coil to be energized. As a result, the ammonia cracking catalyst corresponding to a section of the ammonia cracking reaction inner tank wrapped with the high-frequency inductive heating coil is instantaneously and intensively heated to the first temperature; at the same time, control the increase of the ammonia gas flow rate input into the ammonia cracking reaction inner tank, thereby generating a large flow rate of hydrogen-nitrogen mixed cracked gas; After the ammonia internal combustion engine starts, the specific electronic control method is as follows: Make the coil length driver drive the movable end cover to move away from the front end cover direction, and at the same time make the regulation driver correspondingly drive the movable electrical contact member to move away from the front end cover direction, stretching the high-frequency inductive heating coil so that the high-frequency inductive heating coil completely covers the entire ammonia cracking reaction inner tank; at the same time, continue to control the input of a large flow rate of ammonia gas and continue to generate a large flow rate of hydrogen-nitrogen mixed cracked gas; After the ammonia internal combustion engine starts, under different working conditions, adjust the hydrogen demand. The specific electronic control method is as follows: Make the high-frequency inductive heating coil continue to maintain the state of completely covering the entire ammonia cracking reaction inner tank. At this time, control the movable electrical contact member to move axially along the ammonia cracking reaction inner tank between the front end cover and the movable end cover according to the hydrogen demand of different cylinders, so as to change the number of turns of the high-frequency inductive heating coil participating in inductive heating, and heat different amounts of ammonia cracking catalyst in the ammonia cracking reaction inner tank to a lower second temperature; at the same time, by regulating the input amount of ammonia gas, a hydrogen-nitrogen mixed cracked gas with a dynamically adjustable flow rate is generated.

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