Ammonia gas supply device of ammonia gas burner

Abstract

The utility model relates to the technical field of new energy, in particular to an ammonia gas supply device of an ammonia gas burner, which comprises a main body shell, a plasma ignition burner and a heat exchanger, the main body shell is of a cylindrical structure, the plasma ignition burner is supported in the main body shell, and the heat exchanger is supported on one axial side of the main body shell; the heat exchanger comprises a plurality of heat exchange pipes, is suitable for introducing ammonia gas and can be heated by flue gas output by the plasma ignition burner, and has the beneficial effects that the plasma ignition burner is used for continuously generating high-temperature flue gas, the ammonia gas is used as a combustion raw material, and the raw material of an ammonia gas supply device of the ammonia gas burner is also ammonia gas; and the two can share the same ammonia gas supply device. By means of the design, the utilization rate of ammonia gas is increased, a gas supply system is simplified, the ammonia gas supply device can output ammonia gas mixed gas which is higher in temperature and partially cracked, and then the ammonia gas combustion effect of a follow-up ammonia gas combustion device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to an ammonia supply device for an ammonia burner. Background Art

[0002] Energy shortages and environmental pollution have severely impacted the human living environment and quality of life. In particular, the massive emission of greenhouse gases such as carbon dioxide has caused severe disasters such as glacial melting and sea level rise. Clean energy has become an inevitable trend in energy development and application, as well as in energy conservation and emission reduction. The use of low-carbon or zero-carbon fuels such as ammonia, hydrogen, liquefied natural gas, and biomass fuels has become a hot topic of widespread concern worldwide. Green hydrogen produced from renewable energy holds great potential as a renewable, clean fuel, but its low energy density, low ignition energy, and low liquefaction temperature pose significant challenges to its safe transportation and storage. Ammonia synthesis from nitrogen and hydrogen in the air is a promising renewable energy source. Complete combustion produces only gas and water, and liquefaction can be achieved at room temperature (8.7 atmospheres) or at -33°C (-14°F). Its production and transportation processes are already well-established, making it a promising hydrogen storage medium.

[0003] Ammonia is a fuel that, at room temperature, is a colorless, highly corrosive gas with a pungent odor. Furthermore, ammonia has a low laminar combustion velocity and calorific value, requiring a high energy level for ignition, resulting in a high ignition temperature and a narrow explosion limit of 16% to 25%. Consequently, ammonia has poor combustion characteristics and is difficult to ignite. Therefore, ammonia requires sufficient heating for efficient combustion. This utility model aims to provide an ammonia supply device for an ammonia burner to achieve efficient heating of ammonia, thereby improving the ammonia combustion performance of subsequent ammonia combustion devices. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an ammonia supply device for an ammonia burner to achieve efficient heating of ammonia, thereby improving the combustion effect of ammonia in the ammonia combustion device.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0008] In a first aspect, the utility model provides an ammonia supply device for an ammonia burner, comprising a main body shell, a plasma ignition burner and a heat exchanger; the main body shell is a cylindrical structure, the plasma ignition burner is supported in the main body shell, and the heat exchanger is supported on one axial side of the main body shell; the heat exchanger comprises a plurality of heat exchange tubes, which are suitable for introducing ammonia and can be heated by the flue gas output by the plasma ignition burner, and the outlet ends of the heat exchange tubes are connected to the ammonia burner; the outlet ends of the heat exchange tubes are closer to the plasma ignition burner than the inlet ends of the heat exchange tubes, so as to form a heat exchange space in the heat exchanger with a decreasing temperature from the outlet end of the heat exchange tube toward the inlet end of the heat exchange tube.

[0009] (3) Beneficial effects

[0010] The present invention has the following beneficial effects: the main housing is designed as a cylindrical structure, providing ample internal space for mounting a plasma ignition burner. The plasma ignition burner continuously generates high-temperature flue gas, utilizing ammonia as a combustion feedstock. The ammonia feedstock of the ammonia burner is also ammonia, as both can share the same ammonia feedstock. This design improves ammonia utilization, simplifies the gas supply system, and enhances the consistency of the ammonia feedstock of the ammonia burner.

[0011] The heat exchanger, located axially on one side of the main housing, receives and transfers heat generated by the plasma ignition burner. The heat exchanger includes a heat exchange tube, which serves as a channel for the ammonia gas to pass through and be heated. The outlet of the heat exchange tube is closer to the plasma ignition burner than the inlet, creating a heat exchange space within the heat exchanger with a decreasing temperature from the outlet to the inlet. When ammonia enters the inlet of the heat exchange tube, it first encounters a relatively cool area. As it flows toward the outlet, it gradually encounters higher temperature areas, thereby gradually heating the ammonia.

[0012] In the part close to the inlet end of the heat exchange tube, although the flue gas temperature is low, it can just heat the ammonia in the tube, so that the temperature of the ammonia in the tube can gradually increase, which is conducive to the full heating of the ammonia and the partial cracking of the ammonia in the tube.

[0013] In the section near the heat exchange tube outlet, the flue gas is at a higher temperature, so the preheated ammonia can be more easily raised to the desired temperature, thereby improving the ammonia heating efficiency. At the same time, the flue gas is utilized in a gradient manner, thereby increasing the flue gas utilization rate.

[0014] This ammonia supply device can output a higher temperature and partially cracked ammonia mixture, thereby improving the ammonia combustion effect of the subsequent ammonia combustion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is one of the structural schematic diagrams of the ammonia supply device of the ammonia burner of the present invention;

[0016] Figure 2 For this utility model Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0017] Figure 3 For this utility model Figure 1 Schematic diagram of the cross-sectional structure of the middle BB;

[0018] Figure 4 This is the second structural diagram of the ammonia supply device of the ammonia burner of the present invention;

[0019] Figure 5 This is the third structural diagram of the ammonia supply device of the ammonia burner of the utility model;

[0020] Figure 6 This is one of the structural diagrams of the plasma ignition burner of the present utility model;

[0021] Figure 7 This is the second structural diagram of the plasma ignition burner of the present utility model;

[0022] Figure 8 For this utility model Figure 5 Schematic diagram of the cross-sectional structure of the middle DD;

[0023] Figure 9 For this utility model Figure 5 Schematic diagram of the cross-sectional structure of the CC;

[0024] Figure 10 This is a schematic structural diagram of the injection module of the present invention.

[0025] [Description of Reference Numerals]

[0026] 100. Plasma ignition burner;

[0027] 1. Ammonia plasma igniter; 11. First flame guide; 12. Connecting part; 13. Plasma housing; 14. Air inlet ceramic ring; 15. Electrode; 16. Ammonia inlet;

[0028] 2. Spray box;

[0029] 3. Ammonia supply device; 31. Gas collecting box; 310. Air inlet; 32. Intermediate pipe; 33. Ammonia injection device; 331. Jet pipe; 332. Jet nozzle; 333. Air intake damper;

[0030] 4. Diverter; 41. Injection module; 411. Nozzle; 412. Cover; 413. Turbine; 42. Heat recovery channel;

[0031] 5. Intake pipe;

[0032] 6. Second flame duct;

[0033] 110. Main body shell;

[0034] 120. Heat exchanger; 121. Heat exchange tube; 1211. Horizontal section; 1212. Vertical section; A. Heat exchange space; 122. Gas distribution box; 123. Gas collecting ring; 124. Heat exchange shell; B. Connecting surface;

[0035] 130. Ammonia cracking catalyst. DETAILED DESCRIPTION

[0036] In order to better explain the present invention, and to facilitate understanding, the following Figure 1-10 , through the specific implementation method, the utility model is described in detail. Among them, the directional nouns such as "upper" and "lower" mentioned in this article are Figure 5 or Figure 6 The orientation is referenced.

[0037] Example 1:

[0038] Reference Figure 1-Figure 5 An embodiment of the present utility model provides an ammonia supply device for an ammonia burner, comprising a main body shell 110, a plasma ignition burner 100 and a heat exchanger 120; the main body shell 110 is a cylindrical structure, the plasma ignition burner 100 is supported in the main body shell 110, and the heat exchanger 120 is supported on one axial side of the main body shell 110; the heat exchanger 120 includes a plurality of heat exchange tubes 121, which are suitable for passing ammonia and can be heated by the flue gas output by the plasma ignition burner 100, and the outlet ends of the heat exchange tubes 121 are connected to the ammonia burner; the outlet ends of the heat exchange tubes 121 are closer to the plasma ignition burner 100 than the inlet ends of the heat exchange tubes 121, so as to form a heat exchange space A in the heat exchanger 120 with a temperature decreasing from the outlet end of the heat exchange tube 121 to the inlet end of the heat exchange tube 121.

[0039] In this embodiment, the main shell 110 is designed as a cylindrical structure, providing sufficient internal space for installing the plasma ignition burner 100. Specifically, a sealing ring is provided between the main shell 110 and the plasma ignition burner 100 to prevent the flue gas output by the plasma ignition burner 100 from mistakenly flowing to the side away from the heat exchanger 120.

[0040] The plasma ignition burner 100 continuously generates high-temperature flue gas, utilizing ammonia as a combustion feedstock. The feedstock for the ammonia burner's ammonia supply device is also ammonia, as both can share the same ammonia supply device. This design improves ammonia utilization, simplifies the gas supply system, and enhances the consistency of the ammonia burner's ammonia supply device.

[0041] The heat exchanger 120 is located on one axial side of the main housing 110 and is used to receive and transfer heat generated by the plasma ignition burner 100. The heat exchanger 120 includes a heat exchange tube 121, which is a channel through which ammonia passes and is heated. The outlet end of the heat exchange tube 121 is closer to the plasma ignition burner 100 than the inlet end, so that a heat exchange space A is formed inside the heat exchanger 120 with a temperature decreasing from the outlet end to the inlet end. When ammonia enters from the inlet end of the heat exchange tube 121, it first encounters an area with a relatively low temperature. As the ammonia flows toward the outlet end, it gradually comes into contact with an area with a higher temperature, thereby achieving step-by-step heating of the ammonia.

[0042] In the part close to the inlet end of the heat exchange tube 121, although the flue gas temperature is relatively low, it can just preheat the ammonia in the heat exchange tube 121, so that the temperature of the ammonia in the heat exchange tube 121 can be gradually increased, which is conducive to the sufficient heating of the ammonia and the partial cracking of the ammonia in the heat exchange tube.

[0043] In the portion near the outlet of the heat exchange tube 121, the flue gas is at a higher temperature, so the temperature of the preheated ammonia can be raised to the specified temperature more easily, thereby improving the heating efficiency of the ammonia. At the same time, the flue gas is utilized in a gradient manner, thereby improving the utilization rate of the flue gas.

[0044] This ammonia supply device can output a higher temperature and partially cracked ammonia mixture, thereby improving the ammonia combustion effect of the subsequent ammonia combustion device.

[0045] The heat exchanger 120 also includes an air distribution box 122, an air collecting ring 123 and a heat exchange shell 124. The inlet ends of the heat exchange tubes 121 are connected to the air distribution box 122, and the outlet ends of the heat exchange tubes 121 are connected to the outlet air collecting ring 123; the air distribution box 122 and the air collecting ring 123 can be supported on the heat exchange shell 124, and a heat exchange space A connected to the inner cavity of the main shell 110 is formed in the heat exchange shell 124; the heat exchanger 120 also includes a flue gas outlet provided on the heat exchange shell 124, and the flue gas outlet is closer to the inlet end of the heat exchange tube 121 relative to the outlet end of the heat exchange tube 121, so as to form a heat exchange space A with a decreasing temperature from the outlet end of the heat exchange tube 121 to the inlet end of the heat exchange tube 121.

[0046] In this embodiment, the gas distribution box 122 serves as a device for ammonia to enter the heat exchange tube 121. The gas distribution box 122 evenly distributes the input ammonia to the inlet ends of each heat exchange tube 121 to ensure that each heat exchange tube 121 can obtain nearly the same amount of ammonia, thereby ensuring the uniformity and consistency of the ammonia heating process.

[0047] The gas collecting ring 123, located at the outlet of the heat exchange tubes 121, collects the cracked mixed gas flowing out of each heat exchange tube 121, concentrating the gas mixture and facilitating its subsequent utilization. For example, the partially cracked ammonia mixture can be used as fuel for combustion. The inlet of each heat exchange tube 121 is connected to the gas distribution box 122, and the outlet is connected to the gas collecting ring 123, forming a closed path for the ammonia gas within the heat exchange tubes 121.

[0048] The heat exchange housing 124 supports the gas distribution box 122 and the gas collecting ring 123, providing a stable mounting platform. The interior of the heat exchange housing 124 forms a heat exchange space A that communicates with the inner cavity of the main housing 110. This space is where the flue gas generated by the plasma ignition burner 100 exchanges heat with the ammonia gas in the heat exchange tube 121.

[0049] The flue gas outlet is located on the heat exchange housing 124 and is closer to the inlet of the heat exchange tube 121 than to the outlet of the heat exchange tube 121. This arrangement allows the flue gas to flow along the heat exchange tube 121 from the high-temperature zone near the outlet of the heat exchange tube 121 to the lower temperature zone near the inlet of the heat exchange tube 121 before exiting the heat exchanger 120. This creates a heat exchange space A with a gradually decreasing temperature from the outlet to the inlet of the heat exchange tube 121. This gradually decreasing temperature heat exchange space A helps the ammonia gas gradually heat up during its flow and fully absorbs heat from the flue gas, thereby improving the heating and cracking efficiency of the ammonia gas.

[0050] Example 2:

[0051] Reference Figure 1-Figure 5 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0052] The axes of the main shell 110, the gas distribution box 122, the gas collecting ring 123 and the heat exchange shell 124 coincide with each other; the heat exchange tubes 121 are distributed in a star shape relative to the axis of the gas distribution box 122 and are all located in the heat exchange shell 124, thereby forming the ammonia supply device of the ammonia burner into a columnar structure.

[0053] In this embodiment, the axes of the main housing 110, gas distribution box 122, gas collecting ring 123, and heat exchange housing 124 coincide, aligning these components during installation. This design not only simplifies the device's structure but also makes the heat transfer path more direct and efficient. Because the axes coincide, flue gas flows more smoothly through the heat exchange tubes 121 as it passes through the heat exchange housing 124, reducing heat loss and heat transfer resistance.

[0054] The coincidence of the axes also enhances the stability of the device. Because the centers of gravity of all components are located on or close to the same axis, the device is less likely to vibrate or deviate during operation, thus ensuring the stability and safety of the cracking process.

[0055] Furthermore, the aforementioned overlapping of the axes is also beneficial for improving the structural compactness of the ammonia supply device of the ammonia burner and reducing its space occupancy.

[0056] The heat exchange tubes 121 are distributed in a star shape relative to the axis of the gas distribution box 122 , that is, the heat exchange tubes 121 are distributed circumferentially along the axis of the gas distribution box 122 , preferably symmetrically along the axis of the gas distribution box 122 .

[0057] Since the heat exchange tubes 121 are distributed in a star shape relative to the axis of the gas distribution box 122 , the heat exchange intensity of each heat exchange tube 121 will be more uniform when exchanging heat with the flue gas, thereby improving the heat exchange efficiency.

[0058] Furthermore, the star-shaped distribution helps reduce thermal interference and mutual shielding between the heat exchange tubes 121. Each heat exchange tube 121 independently receives heat from the plasma ignition burner 100 and transfers it to the ammonia gas flowing through it. Because the heat exchange tubes 121 are relatively evenly spaced, localized overheating and uneven cooling can be avoided.

[0059] Example 3:

[0060] Reference Figure 1-Figure 5 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0061] The heat exchange shell 124 is a tapered structure with its large end facing the plasma ignition burner 100 and extending along the axial direction of the plasma ignition burner 100 to form a conical heat exchange space A so that the flue gas gradually gathers toward the flue gas outlet; the gas collecting ring 123 is supported on the large end side of the conical heat exchange shell 124, and the gas distribution box 122 is supported on the small end side of the conical heat exchange shell 124 so that the shape of the heat exchange tube 121 matches the conical heat exchange space A.

[0062] In this embodiment, a conical heat exchange space A is formed in the tapered heat exchange shell 124. The conical heat exchange space A can direct the flow of flue gas, reduce eddy currents and turbulence of flue gas, reduce energy loss, and make the gas flow more stable and efficient.

[0063] The gas collecting ring 123 is supported on the large end side of the conical heat exchange shell 124, while the gas distribution box 122 is supported on the small end side. This layout allows the shape of the heat exchange tube 121 to naturally match the conical heat exchange space A.

[0064] The large end facing the plasma ignition burner 100 can withstand the impact of high-temperature and high-pressure gas from the burner, forming a stable supporting structure, enhancing the overall rigidity and anti-deformation ability of the heat exchange shell 124, and ensuring the stability and reliability of the device during long-term operation.

[0065] Example 4:

[0066] Reference Figure 1-Figure 3 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0067] The heat exchange tube 121 includes a horizontal section 1211 extending along the axial direction of the gas distribution box 122, and a vertical section 1212 extending in a direction perpendicular to the axis of the gas distribution box 122; the end of the vertical section 1212 is connected to the gas collecting ring 123 so that the vertical section 1212 forms a flue gas receiving surface B on the side close to the plasma ignition burner 100.

[0068] In this embodiment, the heat exchange tube 121 first extends along the axis of the gas distribution box 122 to form a horizontal section 1211. This design allows the ammonia gas to be evenly distributed upon entering the heat exchange tube 121 and flow along the horizontal section 1211, initially exchanging heat with the surrounding flue gas. Subsequently, the heat exchange tube 121 extends perpendicular to the axis of the gas distribution box 122 to form a vertical section 1212. The design of the vertical section 1212 allows the heat exchange tube 121 to more directly face the flue gas generated by the plasma ignition burner 100, thereby increasing the contact area and contact time between the flue gas and the heat exchange tube 121.

[0069] The end of the vertical section 1212 is connected to the gas collecting ring 123, forming a flue gas receiving surface B on the side of the vertical section 1212 closest to the plasma ignition burner 100. Because the vertical section 1212 directly faces the high-temperature flue gas, it can more effectively absorb heat from the flue gas and transfer it to the ammonia flowing through the heat exchange tube 121. The formation of the flue gas receiving surface B also helps reduce eddy currents and turbulence in the flue gas within the heat exchange space A, ensuring smoother and more orderly flue gas flow. This helps reduce energy loss and improve heat exchange efficiency.

[0070] By designing heat exchange tube 121 as a combination of horizontal section 1211 and vertical section 1212, the device can more fully utilize the heat generated by plasma ignition burner 100. Horizontal section 1211 provides initial preheating for the ammonia, while vertical section 1212 further enhances the heat exchange process, allowing the ammonia to gradually heat up as it flows through heat exchange tube 121 and reach the temperature required for cracking.

[0071] Example 5:

[0072] Reference Figure 2 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0073] The ammonia supply device of the ammonia burner further includes an ammonia cracking catalyst 130 disposed in the gas collecting ring 123 and / or the heat exchange tube 121 .

[0074] In this embodiment, the ammonia cracking catalyst 130 includes a combination of one or more nickel-based, ruthenium-based, and iron-based ammonia cracking catalysts 130 to promote the cracking of ammonia at high temperature and increase the concentration of hydrogen in the mixed gas so that the ammonia can be burned more efficiently and fully during subsequent utilization.

[0075] Nickel-based catalysts typically have high catalytic activity and selectivity and are suitable for a variety of cracking reactions. However, they are less resistant to sulfur poisoning and require pure feed gas.

[0076] Ruthenium-based catalysts have high activity and good resistance to sulfur poisoning, making them suitable for cracking sulfur-containing feed gas. However, they are relatively expensive.

[0077] Iron-based catalysts are low-cost, but their catalytic activity is relatively low and they require higher reaction temperatures.

[0078] The catalytic activity of cobalt-based catalysts is between that of nickel-based and iron-based catalysts, and they also have good resistance to sulfur poisoning.

[0079] By using these catalysts in the form of one or more combinations, they can be optimized and selected according to specific cracking conditions and target product requirements to achieve the best cracking effect.

[0080] Ammonia cracking catalyst 130 utilizes alumina and / or cerium oxide as a support. These support materials have excellent physical and chemical properties and can provide good catalytically active surface and stability.

[0081] Alumina has a high specific surface area and porosity, which is conducive to the dispersion and loading of catalysts. At the same time, alumina also has good thermal and chemical stability.

[0082] Cerium oxide has excellent oxygen storage and release capabilities, playing an important redox role in the cracking reaction. In addition, cerium oxide can also improve the catalyst's anti-poisoning performance.

[0083] The granular ammonia cracking catalyst 130 has a diameter of 3 to 5 mm. This design facilitates uniform distribution and efficient utilization of the catalyst within the gas collecting ring 123 and / or heat exchange tubes 121. The granular catalyst can be more easily and evenly distributed within the gas collecting ring 123 and / or heat exchange tubes 121 through packing or other methods, ensuring sufficient contact between the ammonia gas and the catalyst.

[0084] By limiting the catalyst diameter, it is possible to ensure that the catalyst has sufficient specific surface area and porosity, thereby providing sufficient catalytic active sites. By limiting the catalyst diameter to 3-5 mm, it is possible to further ensure that the catalyst has sufficient specific surface area and porosity, thereby providing sufficient catalytic active sites. At the same time, this size also facilitates the diffusion and mixing of gases between catalyst particles.

[0085] Example 6:

[0086] Reference Figures 1-10 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0087] The plasma ignition burner 100 includes an ammonia plasma igniter 1, an injection box 2, an ammonia supply device 3 and a diverter 4. The front side of the injection box 2 forms a combustion zone; the ammonia plasma igniter 1 includes a first flame guide 11, the front end of the first flame guide 11 passes through the injection box 2 and extends to the front side of the injection box 2 to form a first preheating zone in the inner cavity of the injection box 2. The front end of the first flame guide 11 forms an opening structure connected to the combustion zone to form an ignition zone; the inner cavity of the first flame guide 11 forms a first combustion chamber of the ammonia plasma igniter 1; the outlet end of the ammonia supply device 3 is connected to the inner cavity of the injection box 2; the diverter 4 includes an injection module 41 and a heat recovery channel 42. The injection module 41 is connected to the front side of the injection box 2 and is connected to the inner cavity of the injection box 2. The ignition zone can preheat the injection module 41 and ignite the ammonia output by the injection module 41 to the combustion zone; the heat recovery channel 42 connects the inner cavity of the injection box 2 and the first combustion chamber, so that the ammonia in the inner cavity of the injection box 2 flows back to the first combustion chamber and is ignited.

[0088] The plasma ignition burner 100 also includes an ammonia cracking catalyst 130 disposed in the injection box 2; the ammonia cracking catalyst 130 includes a combination of one or more nickel-based, ruthenium-based and iron-based ammonia cracking catalysts 130 to promote the cracking of ammonia at high temperature, generate some hydrogen to promote ammonia combustion, and thus help improve the ammonia combustion efficiency.

[0089] The plasma ignition burner 100 of the present invention utilizes only one fuel, ammonia, which is beneficial to improving the integrity and consistency of the burner.

[0090] In this embodiment, a first combustion chamber is formed inside the first flame guide 11. This chamber is where the initial combustion of ammonia occurs. The front end of the first flame guide 11 is designed as an open structure that penetrates the injection box 2. In this way, the high-temperature flame and heat generated by the plasma ignition can be directly radiated to the first preheating zone, which is convenient for heating the ammonia in the injection box 2. Under the flow of the burning mixture, an ignition zone can also be formed on the front side of the injection box 2 to ignite the high-temperature ammonia output by the injection module 41. At the same time, the burning mixture output by the first combustion chamber can also preheat the injection module 41, thereby increasing the temperature of the ammonia output by the injection module 41, which is conducive to ensuring that the ammonia is ignited.

[0091] The injection module 41 and the heat recovery channel 42 divide the ammonia into two output directions. Most of the ammonia is output through the injection module 41 and can be ignited by the first flame duct 11, and a small part is output to the inside of the first flame duct 11 through the heat recovery channel 42. Before the ammonia plasma igniter 1 stops working, this small part of ammonia can be ignited and can remain in the first combustion chamber for a period of time after ignition. In this way, even if the ammonia plasma igniter 1 stops working, the ammonia output by the heat recovery channel 42 can still be ignited.

[0092] In this way, the ammonia plasma igniter 1 plays an ignition role in the initial stage of combustion. When the ammonia in the injection box 2 can reach the temperature of autonomous combustion, it still maintains self-sustaining combustion after the plasma ignition burner 100 is turned off, ensuring the reliability of the use of the plasma ignition burner 100. The ammonia plasma igniter 1 does not need to remain in working condition all the time, thereby reducing the energy consumption of the plasma ignition burner 100.

[0093] In addition, the utility model patent adopts an ammonia plasma igniter 1 to form a high-temperature and highly active hydrogen-containing mixture, which can realize the combustion operation of ammonia in the ignition stage without the need to separately configure high-pressure air or adopt a blower air intake method, further reducing energy consumption and costs and improving ignition reliability.

[0094] Specifically, the injection box 2 is configured as a rotating box body, a through hole for penetrating the first flame guide tube 11 is reserved in the middle thereof, and the two are configured in a coaxial form to ensure structural stability.

[0095] Through holes are distributed on the first flame duct 11 .

[0096] The ammonia supply device 3 includes a gas collecting box 31 and an intermediate pipe 32. The inner cavity of the gas collecting box 31 and the inner cavity of the injection box 2 are connected through the intermediate pipe 32. The first flame duct 11 is arranged between the gas collecting box 31 and the injection box 2. The projection of the intermediate pipe 32 on the first plane falls within the outline of the projection of the gas collecting box 31 and the injection box 2 on the first plane; the first plane is a plane perpendicular to the front and rear directions of the plasma ignition burner 100; the circumferential periphery of the first flame duct 11 forms a second preheating zone, and the intermediate pipes 32 can be set to multiple and distributed in the second preheating zone along the circumference of the first flame duct 11.

[0097] In this embodiment, the gas collecting box 31 serves as a centralized storage and distribution device for ammonia gas, and its inner cavity is connected to the inner cavity of the injection box 2 via an intermediate pipe 32. This design helps ensure that ammonia gas can be evenly and stably supplied to the injection box 2.

[0098] Multiple intermediate conduits 32 can be provided, distributed circumferentially around the periphery of the first flame conduit 11. This arrangement not only increases the number of channels through which ammonia gas enters the injection box 2, but also utilizes the high temperature generated by the first flame conduit 11 to preheat the gas flowing through the intermediate conduits 32. This preheated gas has a higher temperature upon entering the injection box 2, facilitating the combustion of the ammonia gas.

[0099] The second preheating zone is formed at the circumferential periphery of the first flame duct 11. When plasma ignition and preliminary combustion occur in the first flame duct 11, the generated high temperature is radiated to the second preheating zone.

[0100] That is, the method of preheating the intermediate pipe 32 in this embodiment can exist simultaneously with the method of preheating the ammonia in the injection box 2 through the first preheating zone and the method of preheating the injection module 41 through the ignition zone in Example 1, thereby further improving the combustion efficiency of the mixed gas, helping to achieve more complete and efficient combustion of ammonia, and making it easier for the temperature of the mixed gas in the combustion zone to reach the required temperature threshold, further ensuring that the plasma ignition burner 100 in this embodiment can achieve self-sustaining combustion.

[0101] Since the projection of the intermediate pipe 32 along the front-rear axis falls within the contours of the gas collecting box 31 and the injection box 2 projected along the front-rear direction, it is beneficial to the compactness of the structure of the plasma ignition burner 100 and reduces its space occupancy.

[0102] Specifically, the gas collecting box 31 is also configured to be in the shape of a rotating box, and is coaxial with the first flame duct 11 to ensure structural stability.

[0103] The two ends of the first flame duct 11 are connected to the gas collecting box 31 and the injection box 2 by welding.

[0104] The plasma ignition burner 100 further includes an air inlet pipe 5 connected to the combustion zone; the air inlet pipe 5 passes through the gas collecting box 31 and the injection box 2 so that the projection of the air inlet pipe 5 on the first plane falls within the contour of the projection of the gas collecting box 31 and the injection box 2 on the first plane; the air inlet pipe 5 can be provided in plurality and distributed in the second preheating zone along the circumference of the first flame duct 11.

[0105] In this embodiment, the main function of the air intake pipe 5 is to introduce external air or oxygen into the combustion zone, where it is mixed with the ammonia injected from the ammonia injection device 33 to form a combustible mixture. This mixture is ignited in the combustion zone and a combustion reaction occurs, releasing energy.

[0106] The air intake duct 5 is designed to penetrate both the air collecting box 31 and the injection box 2, meaning it passes through the internal spaces of both components to ensure smooth air flow into the combustion zone. Furthermore, the layout of the air intake duct 5 has been carefully considered, with its projection along the front-to-back axis falling within the contours of the air collecting box 31 and the injection box 2. This layout helps reduce the overall size of the burner and improves space utilization.

[0107] The air inlet pipe 5 can be provided in a plurality to meet the requirements of air flow under different working conditions. The plurality of air inlet pipes 5 can be dispersedly arranged at different positions of the burner to provide more uniform air distribution.

[0108] The inlet pipes 5 are distributed within the second preheating zone along the circumference of the first flame duct 11. This distribution helps ensure that sufficient air enters the combustion zone from all directions for thorough mixing with the ammonia. Furthermore, the presence of the second preheating zone preheats the incoming air to a certain temperature, thereby improving combustion efficiency and stability.

[0109] The ammonia plasma igniter 1 also includes an ionization part and a connecting part 12. The outlet end of the ionization part is connected to the first combustion chamber through the connecting part 12. The connecting part 12 passes through the gas collecting box 31 and is supported on the gas collecting box 31. The gas collecting box 31 is provided with an air inlet hole 310 at a position close to the inlet end of the connecting part 12. A first negative pressure zone is formed between the air inlet hole 310 and the inlet end of the connecting part 12, so that air enters the connecting part 12 from the air inlet hole 310. The outlet end of the connecting part 12 is connected to the first combustion chamber. The connecting part 12 is configured to be conical with the large end facing the first flame guide tube 11.

[0110] In this embodiment, the ionization unit is one of the core components of the plasma igniter, which can directly ionize ammonia to form a high-temperature and highly active hydrogen-containing mixed gas. Therefore, there is no need to configure high-pressure air or adopt a blast air intake method, thereby reducing energy consumption.

[0111] The outlet end of the ionization portion is connected to the first combustion chamber through the connecting portion 12, ensuring that the plasma can smoothly enter the first combustion chamber and initiate a combustion reaction.

[0112] The connecting portion 12 is designed to be conical, with the larger end facing the first flame duct 11. This design not only facilitates smooth airflow but also enhances the structural strength of the connecting portion 12, enabling it to be stably supported on the gas collecting box 31. It also allows the mixed gas to be diffused when it is output by the connecting portion 12, thereby improving the combustion efficiency of the mixed gas.

[0113] An air inlet hole 310 is provided in the air collecting box 31 near the inlet end of the connecting portion 12, forming a first negative pressure zone between the air inlet hole 310 and the inlet end of the connecting portion 12. When the ionization unit is operating, the air flow within the connecting portion 12 generates a certain negative pressure effect, drawing air into the connecting portion 12 through the air inlet hole 310. This allows the air to initially mix with the plasma generated by ionization within the connecting portion 12, preparing for the subsequent combustion reaction. This natural aspiration method simplifies the complexity of the air supply system while improving the system's response speed and stability.

[0114] Specifically, a plurality of air inlets may be provided and circumferentially distributed around the inlet end of the connecting portion 12 to ensure that the connecting portion 12 has sufficient air intake.

[0115] The ionization part includes a plasma shell 13, an air intake ceramic ring 14, an electrode 15 and a high-voltage cable; the electrode 15 is supported on the inner wall of the air intake ceramic ring 14; the plasma shell is connected to the rear end of the air intake ceramic ring 14; the rear end of the connecting part 12 and the front end of the air intake ceramic ring 14 are gap-matched to form an air intake channel that allows air to enter the connecting part 12; the high-voltage cable passes through the plasma shell 13 and is electrically connected to the electrode 15, and an ammonia inlet 16 connected to the inner cavity of the air intake ceramic ring 14 is opened on the plasma shell 13; the outlet end of the air intake ceramic ring 14 forms a cyclone part for rotating the gas out.

[0116] In this embodiment, an ammonia inlet 16 is provided on the plasma shell 13 to allow ammonia to enter the interior of the ionization section. The air intake ceramic ring 14 is located at the front end of the plasma shell 13, and the electrode 15 is supported on its inner wall. The air intake ceramic ring 14 not only guides the airflow, but also optimizes the flow characteristics of the airflow through the cyclone section. The electrode 15 is a key component for generating plasma. When a high-voltage current passes through the electrode 15, a high-temperature plasma is generated around it. The connection portion 12 is fitted with a gap at the front end of the air intake ceramic ring 14 to form an air intake channel. This design allows air to enter the connection portion 12 through the air intake channel and mix with the plasma generated by ionization.

[0117] The layout of this embodiment can optimize the compactness of the structure of the ammonia plasma igniter 1, thereby helping to reduce the overall space occupied by the plasma ignition burner 100.

[0118] As the gas passes through the cyclone, it is subjected to a certain rotational force, causing the gas to be discharged in a rotating manner. The cyclone can be configured as a spiral channel. The rotating airflow helps to enhance the turbulent mixing between the gases and improve the uniformity of the mixing of plasma and air, thereby accelerating the combustion reaction and improving combustion efficiency.

[0119] The ammonia plasma igniter 1 further includes a conical net supported in the first flame guide 11 . The conical nets are provided in two numbers with their small ends close to each other, and a large end of one conical net faces the connecting portion 12 .

[0120] In this embodiment, the conical net is used to further disperse the burning ammonia output by the connection part, which is conducive to making it burn more evenly and thus reducing energy consumption.

[0121] There are multiple injection modules 41, and each includes a nozzle 411, a cover 412 and a turbine 413; one end of the nozzle 411 is connected to the inner cavity of the injection box 2, and the cover 412 is covered on the corresponding nozzle 411. The turbine 413 is connected to the outlet end of the cover 412 in a one-to-one rotation along the first axis. The first axis is parallel to the gas output direction of the nozzle 411, so that the turbine 413 can operate passively.

[0122] Specifically, the output end of the nozzle 411 can be configured as a small hole structure to increase the output pressure of the burning mixture while reducing the output volume of the burning mixture, thereby helping to save energy consumption and improve energy utilization.

[0123] By providing multiple injection modules 41, multi-point injection and combustion can be achieved, thereby increasing the flame distribution range and density, which helps to improve overall combustion efficiency and reduce the phenomenon of uneven combustion caused by local high or low temperatures.

[0124] One end of the nozzle 411 is connected to the inner cavity of the spray box 2, and the turbine 413 is rotatably connected to the cover 412 along the first axis. This design allows the turbine 413 to passively rotate with the jet flow, thereby achieving efficient energy utilization and conversion.

[0125] Turbine 413 operates passively, meaning it rotates solely through the impact of the jet stream, independent of an external power source. When nozzle 411 ejects a high-speed airflow, it impacts the blades of turbine 413, causing them to rotate. This mechanism not only simplifies the system structure but also improves its reliability and stability. Turbine 413 evenly disperses the airflow output by nozzle 411, further saving energy, improving combustion uniformity, and increasing energy efficiency.

[0126] The rotation of the turbine 413 can also promote the mixing of the injected ammonia and air, enhance the turbulence level in the combustion zone, and thus improve the combustion efficiency.

[0127] In the entire injection module 41, the nozzle 411 is responsible for injecting the mixed gas, while the turbine 413 operates passively to optimize the injection effect and promote the combustion process. The simultaneous operation of multiple modules makes the flame in the combustion zone more uniform and stable, significantly improving combustion efficiency.

[0128] The axes of the injection modules 41 extend in the front-to-back direction, and the extension positions of the outlet ends of the injection modules 41 relative to the axes in the front-to-back direction are not all the same, so that the outlet ends of the nozzles 411 form a stepped combustion zone.

[0129] In this embodiment, the axes of the injection modules 41 extend in the front-to-back direction, which helps to ensure that the injected airflow can enter the combustion zone in a predetermined direction;

[0130] The outlet ends of the injection modules 41 are not all located at the same position relative to the axis, that is, they are not all located on the same plane, but are distributed at different axial positions. This differentiated design enables the ejected airflow to form a stepped distribution.

[0131] Due to the different positions of the outlet ends of the injection modules 41, the injected airflow forms a stepped combustion zone. This stepped layout helps to increase the contact area and combustion time of the flame, allowing the mixed gas to burn more fully.

[0132] The stepped combustion zone also promotes the agitation and mixing of ammonia and air, improving combustion efficiency and stability. As ammonia passes through the stepped area, it generates eddies and turbulence. These complex flow phenomena help enhance the mixing of the mixture within the combustion zone and promote the combustion reaction.

[0133] The formation of a stepped combustion zone makes the flame distribution more uniform, reducing the occurrence of localized high and low temperature areas. This helps reduce the emission of harmful substances such as nitrogen oxides generated during the combustion process and improves combustion cleanliness.

[0134] In addition, since the stepped design increases the flame contact area and combustion time, the mixed gas can burn more fully, thereby improving combustion efficiency and energy utilization.

[0135] This stepped injection module 41 layout design also improves the adaptability and flexibility of the system. By adjusting the outlet positions of different injection modules 41, the flame distribution and combustion intensity in the combustion chamber can be precisely controlled to meet the combustion requirements under different working conditions and load requirements.

[0136] The plasma ignition burner 100 further includes a second flame guide 6 , which is supported on the injection box 2 . The inner cavity of the second flame guide 6 forms a second combustion chamber that accommodates all injection modules 41 . The second flame guide 6 can be configured to have the same structure as the first flame guide 11 .

[0137] In this embodiment, the second flame duct 6 provides a confined space for the mixing of ammonia and air, which helps to promote more complete mixing and more uniform combustion of the two, thereby improving combustion efficiency.

[0138] By limiting the combustion area, the second flame duct 6 helps to reduce the fluctuation and instability of the flame, making the combustion process more stable and reliable.

[0139] The ammonia supply device 3 also includes an ammonia injection device 33 connected to the inner cavity of the gas collecting box 31; the ammonia injection device 33 includes a jet tube 331 and a jet nozzle 332. The outlet end of the jet tube 331 is connected to the inner cavity of the gas collecting box 31. When the jet nozzle 332 outputs ammonia, a second negative pressure area can be formed between the jet tube 331 and the jet nozzle 332.

[0140] A narrow flow channel is formed in the middle of the jet tube 331, and the jet nozzle 332 extends into the narrow flow channel; the jet tube 331 corresponds to the position on both sides of the axial direction of the narrow flow channel, forming a tapered channel that gradually expands away from the narrow flow channel, and the tapered channels are connected to the narrow flow channel.

[0141] The ammonia supply device 3 may further include an air intake damper 333 disposed in the second negative pressure area.

[0142] A narrow flow channel is formed in the middle of the jet tube 331 to limit the initial flow rate and flow direction of the ammonia gas, thereby enhancing the stability and concentration of the jet.

[0143] The jet nozzle 332 extends into the narrow channel, further accelerating the flow of ammonia gas and forming a high-speed jet at the outlet of the nozzle 411. When the ammonia gas is ejected through the jet nozzle 332, the increased flow rate and the contraction of the nozzle 411 create a low-pressure area between the jet tube 331 and the jet nozzle 332, i.e., a second negative pressure area.

[0144] As previously mentioned, the second negative pressure zone is formed by the Bernoulli effect generated when the jet nozzle 332 outputs ammonia. This negative pressure zone not only helps stabilize the jet of ammonia but also provides power for the intake of external air, thereby ensuring that the ammonia-air mixture output by the ammonia supply device 3 is more fully burned, thereby improving the combustion efficiency of the ammonia.

[0145] The jet tubes 331 are positioned axially on either side of the narrow channel, forming tapered channels that gradually expand away from the narrow channel. These tapered channels connect to the narrow channel, providing more space and a more complex flow field for further mixing of ammonia and air. This facilitates thorough mixing of the ammonia and air.

[0146] An air intake damper 333, located in the second negative pressure zone, regulates and controls the amount of air entering the tapered passage. By adjusting the opening of the air intake damper 333, the ammonia-air mixture ratio can be precisely controlled to meet the requirements of different operating conditions. This design enhances the flexibility and adaptability of the ammonia supply device 3.

[0147] Furthermore, this air supply method can exist simultaneously with the air supply method in Example 3, or can exist independently of the air supply method in Example 3. Preferably, they exist simultaneously to ensure sufficient air supply for the combustion process of ammonia.

[0148] For the plasma ignition burner 100 in any of the above embodiments, the following steps are performed to ensure effective ignition, stable combustion, and efficient utilization of ammonia, as detailed below.

[0149] Step 1: Start and preheat the ammonia plasma igniter 1

[0150] Description of steps: First, the ammonia plasma igniter 1 is controlled to start working. The igniter uses the high temperature characteristics of plasma to ignite the ammonia gas entering the first flame duct 11, so that the ammonia gas continues to burn in the first flame duct 11.

[0151] Ignition by the ammonia plasma igniter 1 causes the ammonia gas in the first flame conduit 11 to continuously burn, generating sufficient heat. This heat, through conduction or radiation, preheats the injection box 2 cavity and injection module 41 located in the first preheating zone and ignition zone. This preheating process is crucial for subsequent ammonia injection and mixing, as it improves the ignition success rate and combustion efficiency of the ammonia gas.

[0152] Step 2: Ammonia and air supply

[0153] Conditional judgment: This step is performed only after confirming that the inner cavity of the injection box 2 and the injection module 41 are heated to the specified temperature by the first preheating zone and the ignition zone. The specified temperature is a key parameter to ensure stable combustion of ammonia, such as 400-600°C.

[0154] Description of steps: Control the ammonia supply device 3 to input ammonia into the inner cavity of the injection box 2. When the combustion zone is an open structure, the ammonia and external air can mix in the combustion zone so as to be ignited by the flame ejected from the first flame duct 11. The ejected ammonia helps to mix with the air, thereby helping to improve the ignition success rate and combustion stability of the ammonia.

[0155] Step 3: Stopping and continuing combustion of ammonia plasma igniter 1

[0156] Conditional judgment: Based on the continuous ignition of ammonia burning in the first flame duct 11 and the continuous input of ammonia from the heat regeneration channel 42, the combustion process has stabilized. After confirming the stability of the combustion process, the ammonia plasma igniter 1 is controlled to stop operation. At this point, the combustion process is maintained by the continuous output of ammonia from the heat regeneration channel 42.

[0157] By stopping the operation of the ammonia plasma igniter 1, energy consumption can be reduced while utilizing the established stable combustion process to maintain the combustion reaction. This helps to improve combustion efficiency and reduce operating costs.

[0158] By utilizing the ammonia burning in the first flame duct 11 to ignite the ammonia continuously transported in the heat regeneration channel 42 and controlling the ammonia plasma igniter 1 to stop operating, this method further optimizes the combustion process and achieves efficient operation. This not only improves the ammonia ignition success rate and combustion efficiency, but also reduces operating costs and energy consumption.

[0159] The above-mentioned combustion method includes in detail:

[0160] Step 1: Start and preheat the ammonia plasma igniter 1

[0161] Description of steps: First, the ammonia plasma igniter 1 is controlled to start working. The igniter uses the high temperature characteristics of plasma to ignite the ammonia gas entering the first flame duct 11, so that the ammonia gas continues to burn in the first flame duct 11.

[0162] Ignition by the ammonia plasma igniter 1 causes the ammonia gas in the first flame duct 11 to continuously burn, generating sufficient heat. This heat, through conduction or radiation, preheats the injection box 2 cavity, intermediate conduit 32, intake pipe 5, and injection module 41 located in the first preheating zone, second preheating zone, and ignition zone. This preheating process is crucial for subsequent ammonia injection and mixing, as it improves the ammonia's ignition success rate and combustion efficiency.

[0163] Step 2: Ammonia and air supply

[0164] Conditional judgment: This step is performed only after confirming that the inner cavity of the injection box 2, the intermediate pipe 32, the intake pipe 5, and the injection module 41 have been heated to the specified temperature by the first preheating zone, the second preheating zone, and the ignition zone. The specified temperature is a key parameter to ensure stable combustion of ammonia, such as 400-600°C.

[0165] Step Description: Control the ammonia supply device 3 to deliver ammonia into the inner cavity of the injection box 2, while simultaneously controlling the air intake pipe 5 to deliver air to the combustion zone. The ammonia and air mix in the combustion zone, allowing them to be ignited by the flame emitted from the first flame duct 11. Because the ammonia and air are preheated to the specified temperature, this helps improve the ignition success rate and combustion stability of the ammonia.

[0166] Step 3: Stopping and continuing combustion of ammonia plasma igniter 1

[0167] Conditional judgment: Based on the continuous ignition of ammonia burning in the first flame duct 11 and the continuous input of ammonia from the heat regeneration channel 42, the combustion process has stabilized. After confirming the stability of the combustion process, the ammonia plasma igniter 1 is controlled to stop operation. At this point, the combustion process is maintained by the continuous output of ammonia from the heat regeneration channel 42.

[0168] By stopping the operation of the ammonia plasma igniter 1, energy consumption can be reduced while utilizing the established stable combustion process to maintain the combustion reaction. This helps to improve combustion efficiency and reduce operating costs.

[0169] By utilizing the ammonia burning in the first flame duct 11 to ignite the ammonia continuously transported in the heat regeneration channel 42 and controlling the ammonia plasma igniter 1 to stop operating, this method further optimizes the combustion process and achieves efficient operation. This not only improves the ammonia ignition success rate and combustion efficiency, but also reduces operating costs and energy consumption.

[0170] It can be understood that, except for any conflicting parts, the above-mentioned embodiments 1-6 can be freely combined to form other implementation methods of the present invention.

[0171] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0172] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0173] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0174] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, article, or apparatus / device.

[0175] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. An ammonia supply device for an ammonia burner, characterized in that: It comprises a main body shell (110), a plasma ignition burner (100) and a heat exchanger (120); The main body shell (110) is a cylindrical structure, the plasma ignition burner (100) is supported in the main body shell (110), and the heat exchanger (120) is supported on one axial side of the main body shell (110); The heat exchanger (120) includes a plurality of heat exchange tubes (121) adapted to be fed with ammonia gas and capable of being heated by the flue gas output by the plasma ignition burner (100), wherein the outlet ends of the heat exchange tubes (121) are connected to the ammonia burner; The outlet ends of the heat exchange tubes (121) are closer to the plasma ignition burner (100) than the inlet ends of the heat exchange tubes (121), so as to form a heat exchange space (A) in the heat exchanger (120) with a temperature gradually decreasing from the outlet end of the heat exchange tubes (121) toward the inlet end of the heat exchange tubes (121).

2. The ammonia supply device for an ammonia burner according to claim 1, wherein: The heat exchanger (120) further comprises an air distribution box (122), an air collecting ring (123) and a heat exchange shell (124); the inlet ends of the plurality of heat exchange tubes (121) are all in communication with the air distribution box (122); and the outlet ends of the plurality of heat exchange tubes (121) are all in communication with the outlet air collecting ring (123); The gas distribution box (122) is suitable for connecting to an ammonia supply device, and the gas collecting ring (123) is suitable for connecting to an ammonia burner; the gas distribution box (122) and the gas collecting ring (123) can both be supported on the heat exchange shell (124); the heat exchange space (A) is formed in the heat exchange shell (124) and is connected to the inner cavity of the main shell (110); The heat exchanger (120) further comprises a flue gas outlet provided on the heat exchange shell (124), wherein the flue gas outlet is closer to the inlet end of the heat exchange tube (121) relative to the outlet end of the heat exchange tube (121), so as to form the heat exchange space (A) whose temperature gradually decreases from the outlet end of the heat exchange tube (121) toward the inlet end of the heat exchange tube (121).

3. The ammonia supply device for an ammonia burner according to claim 2, wherein: The axes of the main housing (110), the gas distribution box (122), the gas collecting ring (123) and the heat exchange housing (124) coincide with each other; The heat exchange tubes (121) are distributed in a star shape relative to the axis of the gas distribution box (122) and are all located in the heat exchange shell (124).

4. The ammonia supply device for an ammonia burner according to claim 3, wherein: The heat exchange shell (124) is a tapered structure with its large end facing the plasma ignition burner (100) and extending along the axis of the plasma ignition burner (100) to form the conical heat exchange space (A) so as to gradually gather the smoke toward the smoke outlet; The gas collecting ring (123) is supported on the large end side of the conical heat exchange shell (124), and the gas distribution box (122) is supported on the small end side of the conical heat exchange shell (124), so that the shape of the heat exchange tube (121) matches the conical heat exchange space (A).

5. The ammonia supply device for an ammonia burner according to claim 4, characterized in that: The heat exchange tube (121) comprises a horizontal section (1211) extending along the axial direction of the gas distribution box (122), and a vertical section (1212) extending in a direction perpendicular to the axis of the gas distribution box (122), wherein the horizontal section (1211) and the vertical section (1212) are in communication with each other; The end of the vertical section (1212) is connected to the gas collecting ring (123), so that a smoke receiving surface (B) is formed on the side of the vertical section (1212) close to the plasma ignition burner (100).

6. The ammonia supply device for an ammonia burner according to claim 5, characterized in that: It also includes an ammonia cracking catalyst (130) arranged in the gas collecting ring (123) and / or the heat exchange tube (121).

7. The ammonia supply device for an ammonia burner according to any one of claims 1 to 6, characterized in that: The plasma ignition burner (100) comprises an ammonia plasma igniter (1), an injection box (2), an ammonia supply device (3) and a diverter (4), wherein the front side of the injection box (2) forms a combustion zone; The ammonia plasma igniter (1) comprises a first flame guide (11), the front end of the first flame guide (11) passes through the injection box (2) and extends to the front side of the injection box (2) to form a first preheating zone in the inner cavity of the injection box (2), and the front end of the first flame guide (11) forms an opening structure communicating with the combustion zone to form an ignition zone; The inner cavity of the first flame guide (11) forms a first combustion chamber of the ammonia plasma igniter (1); The outlet end of the ammonia supply device (3) is connected to the inner cavity of the injection box (2); The diversion device (4) comprises an injection module (41) and a heat recovery channel (42), wherein the injection module (41) is connected to the front side of the injection box (2) and communicates with the inner cavity of the injection box (2), and the ignition zone is capable of preheating the injection module (41) and igniting the ammonia output by the injection module (41) to the combustion zone; and the heat recovery channel (42) communicates with the inner cavity of the injection box (2) and the first combustion chamber, so that the ammonia in the inner cavity of the injection box (2) flows back to the first combustion chamber and is ignited.

8. The ammonia supply device for an ammonia burner according to claim 7, wherein: The ammonia supply device (3) comprises a gas collecting box (31) and an intermediate pipe (32), the inner cavity of the gas collecting box (31) and the inner cavity of the injection box (2) are communicated through the intermediate pipe (32), the first flame guide (11) is arranged between the gas collecting box (31) and the injection box (2), and the projection of the intermediate pipe (32) on a first plane falls within the outline of the projections of the gas collecting box (31) and the injection box (2) on the first plane; The first plane is a plane perpendicular to the front-to-back direction of the plasma ignition burner (100); The circumferential periphery of the first flame duct (11) forms a second preheating zone, and the intermediate pipes (32) can be provided in plurality and distributed in the second preheating zone along the circumference of the first flame duct (11).

9. The ammonia supply device for an ammonia burner according to claim 8, wherein: The plasma ignition burner (100) further includes an air inlet pipe (5) communicating with the combustion zone; The air intake pipe (5) passes through the air collecting box (31) and the injection box (2), so that the projection of the air intake pipe (5) on the first plane falls within the contours of the projections of the air collecting box (31) and the injection box (2) on the first plane; The air inlet pipe (5) can be provided in plurality and distributed in the second preheating zone along the circumference of the first flame duct (11).

10. The ammonia supply device for an ammonia burner according to claim 9, wherein: The plasma ignition burner (100) further comprises a second flame guide (6), the second flame guide (6) being supported on the injection box (2), the inner cavity of the second flame guide (6) forming a second combustion chamber for accommodating the injection module (41), and the open end of the second flame guide (6) facing the heat exchanger (120).

Images