Ammonia plasma ignition combustion system

Abstract

The present invention relates to the technical field of energy conversion, and in particular to an ammonia plasma ignition and combustion system and a combustion method, comprising a furnace body, an ammonia plasma igniter and a main fire furnace, wherein a combustion chamber with an open top is formed in the furnace body; wherein the main fire furnace and a flame duct are arranged in the opposite direction of the rising direction of the flue gas to form an ignition zone between the flame duct and the main fire furnace, and the beneficial effect is that the present invention can realize the self-sustaining combustion of the ammonia plasma ignition and combustion system, thereby ensuring the reliability of the use of the ammonia plasma ignition and combustion system, and the ammonia plasma igniter does not need to keep working all the time, thereby reducing the energy consumption of the ammonia plasma ignition and combustion system; the ammonia plasma ignition and combustion system and the gas collecting box can both receive ammonia, thereby simplifying the ammonia supply system and improving the consistency of the ammonia plasma ignition and combustion system.

Description

Technical Field

[0001] The invention relates to the technical field of energy conversion, and in particular to an ammonia plasma ignition combustion system and a combustion method. Background Art

[0002] The reserves of non-renewable fossil energy such as coal, oil, and natural gas are limited. Clean energy has become an inevitable trend in energy development and application and energy conservation and emission reduction, such as nuclear fusion energy, photovoltaics, wind energy, tidal energy and other pollution-free new energy. Photovoltaic, wind energy and tidal energy have regional and seasonal characteristics, and the electricity generated is unstable. Alternative fuels with higher combustion efficiency and cleaner combustion, such as ammonia, hydrogen, liquefied natural gas, biomass fuels, etc., have been studied at home and abroad. Among them, hydrogen has great potential as a renewable clean fuel, but due to its low energy density and low ignition energy, it brings great challenges to the safety of transportation and storage. As a derivative of hydrogen, ammonia is a very promising renewable energy. The only products of complete combustion are gas and water, and the production and transportation process is already quite mature.

[0003] Ammonia is a colorless, pungent, highly corrosive gas at room temperature. It has poor combustion characteristics, low laminar combustion velocity and calorific value, high ignition capacity, high ignition temperature, and narrow explosion limit, between 16% and 25%. At present, the main domestic method is to mix ammonia with a fuel that can accelerate the combustion reaction of ammonia to achieve ignition and self-sustaining combustion performance requirements, such as ammonia-hydrogen, ammonia-diesel, ammonia-gasoline, ammonia-methane, etc. This adds two fuel supply systems, which increases the complexity and unreliability of the system, increases weight and volume, and also brings many risks. Therefore, how to quickly ignite and maintain efficient and sustainable combustion under the condition of an ammonia fuel has become an urgent problem to be solved. Summary of the invention

[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 plasma ignition and combustion system, which solves the technical problems of adding two sets of fuel supply systems in the prior art, which increases the complexity and unreliability of the system, and increases the weight and volume, as well as the technical problem of how to quickly ignite and maintain efficient and sustainable combustion under the condition of an ammonia fuel.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, the present invention provides an ammonia plasma ignition and combustion system, comprising a furnace body, an ammonia plasma igniter and a main fire furnace, wherein a combustion chamber with an open top is formed in the furnace body to form a smoke outlet at the top of the combustion chamber; the ammonia plasma igniter is supported on the furnace body and is suitable for receiving and igniting ammonia, and the ammonia plasma igniter comprises a flame duct whose front end extends laterally into the combustion chamber and outputs the burning ammonia; the main fire furnace is supported on the furnace body and its front end extends laterally into the combustion chamber, the main fire furnace is provided with a plurality of first ammonia outlets and second ammonia outlets along the rising direction of the smoke and away from the rising direction of the smoke, and the main fire furnace is suitable for receiving ammonia; wherein the main fire furnace and the flame duct are arranged in the opposite direction of the rising direction of the smoke to form an ignition zone between the flame duct and the main fire furnace.

[0009] In a second aspect, the present invention provides a combustion method of an ammonia plasma ignition combustion system, which is applied to the ammonia plasma ignition combustion system in the above technical solution, and the combustion method comprises:

[0010] S1: the ammonia plasma igniter works, so that the flame guide continuously outputs burning ammonia, so that the ignition zone heats the main fire furnace;

[0011] S2: Based on the main fire furnace being heated to a specified temperature, ammonia is input into the main fire furnace, so that the ammonia outputted from the second ammonia outlet is ignited by the open flame of the ignition zone, and the ammonia outputted from the first ammonia outlet is ignited by the ammonia outputted from the second ammonia outlet that has been ignited, or is ignited by the open flame of the ignition zone;

[0012] S3: Based on the continuous combustion of ammonia gas outputted from the main fire furnace, the ammonia plasma igniter is controlled to stop working.

[0013] (III) Beneficial effects

[0014] The beneficial effects of the present invention are as follows: the ammonia plasma ignition combustion system and combustion method of the present invention, the ammonia plasma ignition combustion system and the main fire furnace can both receive ammonia, thereby simplifying the ammonia supply system and improving the consistency of the ammonia plasma ignition combustion system.

[0015] After the temperature of the main fire furnace rises, ammonia is introduced. The ammonia directly entering the main fire furnace is divided into two parts. Most of the ammonia is output upward by the main fire furnace, and a small part of the ammonia is output downward by the main fire furnace and ignited by the flame in the ignition zone, which can then ignite the ammonia output upward by the main fire furnace. When the ammonia output upward and downward from the main fire furnace is stably burned, the ammonia plasma igniter can be turned off. Under the residual heat of the main fire furnace, the ammonia can still maintain the temperature required for combustion. At the same time, the ammonia output upward and downward from the main fire furnace will not stop immediately after the ammonia plasma igniter is turned off. Therefore, the self-sustaining combustion of the ammonia plasma ignition and combustion system can be achieved, which ensures the reliability of the use of the ammonia plasma ignition and combustion system. The ammonia plasma igniter does not need to be kept in working state all the time, thereby reducing the energy consumption of the ammonia plasma ignition and combustion system.

[0016] In addition, the invention patent adopts an ammonia plasma igniter 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 configure high-pressure air or adopt a blower air intake method, further reducing energy consumption and costs and improving ignition reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the ammonia plasma ignition and combustion system of the present invention;

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure of the CC;

[0019] Figure 3 It is a schematic diagram of the structure of the housing of the present invention;

[0020] Figure 4 For the present invention Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0021] Figure 5 For the present invention Figure 2 A schematic diagram of the local enlarged structure at B in the middle;

[0022] Figure 6 It is a structural schematic diagram of the ammonia injection device of the present invention;

[0023] Figure 7 It is a structural schematic diagram of the ammonia plasma igniter of the present invention;

[0024] Figure 8 It is a structural schematic diagram of the first injection module or the second injection module of the present invention;

[0025] Fig. 9 It is a schematic diagram of the top view of the heat recovery pipe of the present invention.

[0026] [Description of Reference Numerals]

[0027] 100, furnace body; 101, shell; 102, vertical plate; 103, first shell; 104, second shell; 110, ammonia plasma igniter; 111, connecting part; 112, plasma shell; 113, air inlet ceramic ring; 114, electrode; 115, high-voltage cable; 116, conical net; 117, flame guide tube; 120, main fire furnace; 130, gas collecting box; 140, heat recovery box; 150 , heat recovery pipe; 160, air supply pipeline; 161, first pipeline; 162, second pipeline; 163, second pipeline; 170, ammonia injection device; 171, jet pipe; 172, jet nozzle; 173, air intake damper; 180, first injection module; 190, second injection module; 181, nozzle; 182, cover; 183, turbine; 200, ammonia cracking catalyst; 210, porous pipe cover. DETAILED DESCRIPTION

[0028] In order to better explain the present invention, so as to facilitate understanding, the following Figure 1-9 , the present invention is described in detail through specific implementation methods. Figure 2 The orientation is used as a reference.

[0029] Embodiment 1:

[0030] Reference Figure 1-Figure 7 The embodiment of the present invention provides an ammonia plasma ignition combustion system, comprising a furnace body 100, an ammonia plasma igniter 110 and a main fire furnace 120. A combustion chamber with an open top is formed in the furnace body 100, so that a smoke outlet is formed at the top of the combustion chamber; the ammonia plasma igniter 110 is supported on the furnace body 100, suitable for receiving and igniting ammonia, and the ammonia plasma igniter 110 includes a flame guide 117 whose front end extends transversely into the combustion chamber and outputs the burning ammonia; the main fire furnace 120 is supported on the furnace body 100 and the front end extends transversely into the combustion chamber, and the main fire furnace 120 is provided with a plurality of first ammonia outlets and second ammonia outlets along the rising direction of the smoke and away from the rising direction of the smoke, and the main fire furnace 120 is suitable for receiving ammonia;

[0031] The main fire furnace 120 and the flame duct 117 are arranged in the opposite direction to the rising direction of the smoke, so as to form an ignition zone between the flame duct 117 and the main fire furnace 120 .

[0032] In this embodiment, the furnace body 100 serves as a supporting structure of the entire system, and a combustion chamber with an open top is formed inside. The ammonia plasma igniter 110 is supported on the furnace body 100, and its front end extends laterally into the combustion chamber, and includes a flame guide 117. The ammonia plasma igniter 110 can ignite ammonia and output it into the combustion chamber through the flame guide 117. The flame guide 117 helps to limit the combustion area of ​​the ammonia, and helps to guide and stabilize the flame; specifically, the first flame guide 117 is a porous tubular structure.

[0033] The main fire furnace 120 is also supported on the furnace body 100, and the front end also extends horizontally into the combustion chamber. The upper and lower parts of the main fire furnace 120 can be provided with gas outlets so that the ammonia gas entering the main fire furnace 120 can be discharged upward and downward.

[0034] The ignition zone is used to ignite the ammonia gas output downward from the main fire furnace 120. The ammonia gas output upward from the main fire furnace 120 can be ignited by the ammonia gas output downward from the main fire furnace 120 that has been burning, or can be ignited by the flame of the ignition zone.

[0035] That is, the ammonia enters the main fire furnace 120, is then output upward and downward by the main fire furnace 120, and is ignited by the burning ammonia output by the flame duct 117, that is, is ignited by the burning ammonia in the ignition zone; the main fire furnace 120 will be heated by the ignition zone, which is conducive to increasing the temperature, thereby heating the internal ammonia and improving the combustion efficiency and combustion reliability of the ammonia.

[0036] After the temperature of the main fire furnace 120 rises, ammonia is introduced. The ammonia directly entering the main fire furnace 120 is divided into two parts. Most of the ammonia is output upward by the main fire furnace 120, and a small part of the ammonia is output downward by the main fire furnace 120 and ignited by the flame in the ignition zone, thereby igniting the ammonia output upward by the main fire furnace 120. When the ammonia output upward and downward from the main fire furnace 120 burns stably, the ammonia plasma igniter 110 can be turned off. Under the residual heat of the main fire furnace 120, the ammonia can still maintain the temperature required for combustion. At the same time, the ammonia output upward and downward from the main fire furnace 120 will not stop immediately after the ammonia plasma igniter 110 is turned off. Therefore, the self-sustaining combustion of the ammonia plasma ignition combustion system can be achieved, and the reliability of the use of the ammonia plasma ignition combustion system is guaranteed. The ammonia plasma igniter 110 does not need to keep working all the time, thereby reducing the energy consumption of the ammonia plasma ignition combustion system.

[0037] In addition, the invention patent adopts an ammonia plasma igniter 110 to form a high-temperature and highly active hydrogen-containing mixed gas, and 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, thereby further reducing energy consumption and costs and improving ignition reliability.

[0038] The ammonia plasma ignition and combustion system and the main fire furnace 120 can both receive ammonia gas, thereby simplifying the ammonia gas supply system and improving the consistency of the ammonia plasma ignition and combustion system.

[0039] The flue gas produced by combustion can heat other devices that require heat absorption, such as the heat absorption tubes in the ammonia cracking device.

[0040] Embodiment 2:

[0041] 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:

[0042] It also includes a gas collecting box 130, a heat recovery box 140 and a heat recovery pipe 150. The gas collecting box 130 is connected to the rear end of the main fire furnace 120 and communicates with the main fire furnace 120, and is suitable for receiving ammonia gas; the heat recovery box 140 is connected to the front end of the main fire furnace 120 and communicates with the main fire furnace 120; the heat recovery pipe 150 communicates with the gas collecting box 130 and the heat recovery box 140, so that the gas collecting box 130 outputs ammonia gas to the main fire furnace 120 and the heat recovery pipe 150 respectively;

[0043] The heat recovery pipe 150 , the main fire furnace 120 and the flame duct 117 are sequentially distributed in the opposite direction of the rising direction of the flue gas to form a preheating zone between the main fire furnace 120 and the heat recovery pipe 150 .

[0044] In this embodiment, the gas collecting box 130 is used to receive ammonia gas supplied from the outside and distribute it to the main fire furnace 120 and the heat recovery pipe 150. The gas collecting box 130 serves as a buffer space between the main fire furnace 120 and the heat recovery pipe 150 for ammonia gas to enter, which is conducive to adjusting the flow rate and pressure of ammonia gas, so that ammonia gas can enter the main fire furnace 120 and the heat recovery pipe 150 evenly, thereby improving the operating reliability of the entire system.

[0045] The heat recovery box 140 is connected to the front end of the main fire furnace 120 and is communicated with the main fire furnace 120. The heat recovery box 140 serves as a buffer space between the main fire furnace 120 and the front end of the heat recovery pipe 150. Since ammonia will enter the heat recovery box 140 through the heat recovery pipe 150 with a relatively small aperture, the flow rate of ammonia will be reduced, which is conducive to ammonia entering the main fire furnace 120 more smoothly.

[0046] The preheating zone is used to heat the ammonia gas flowing in the heat regeneration pipe 150 to make it closer to the temperature required for combustion, such as 400-600° C., thereby improving the stability and reliability of the ammonia gas during combustion.

[0047] After entering the gas collecting box 130, the ammonia gas will be divided into two parts. One part enters the main fire furnace 120, and is then output upward and downward by the main fire furnace 120, and will be ignited by the burning ammonia gas output by the flame duct 117, that is, it will be ignited by the burning ammonia gas in the ignition zone; the other part enters the heat recovery pipe 150, and when flowing through the heat recovery pipe 150, it is preheated by the burning ammonia gas output upward from the main fire furnace 120, that is, it is preheated by the preheating zone. After being heated, the ammonia gas enters the heat recovery box 140, enters the main fire furnace 120, and is then output upward or downward by the main fire furnace 120.

[0048] During the above-mentioned ammonia flow process, the main fire furnace 120 will be heated by the ignition zone, and the heat recovery pipe 150 will be heated by the preheating zone, which is beneficial to increase the temperature of the two, and then heat the ammonia inside the two, thereby improving the combustion efficiency and combustion reliability of the ammonia.

[0049] That is, there are two ammonia output routes, one is that the gas collecting box 130 directly outputs ammonia to the main fire furnace 120, and the other is that the gas collecting box 130 outputs ammonia to the regenerative pipe 150, and then enters the main fire furnace 120 after being collected in the regenerative box 140. The ammonia output by the above two output routes is finally output upward and downward through the main fire furnace 120, thereby forming a stable ammonia flow route between the gas collecting box 130, the regenerative box 140, the main fire furnace 120, and the regenerative pipe 150 in the main fire furnace 120.

[0050] After the temperature of the main fire furnace 120 and the regenerative heat pipe 150 rises, ammonia is introduced into the gas collecting box 130. The ammonia directly entering the main fire furnace 120 is divided into two parts. Most of the ammonia is output upward by the main fire furnace 120, and a small part of the ammonia is output downward by the main fire furnace 120 and ignited by the flame in the ignition zone, which can further ignite the ammonia output upward from the main fire furnace 120. The ammonia input into the regenerative heat pipe 150 is preheated in the preheating zone and then flows back to the main fire furnace 120. When the ammonia gas output upward and downward from the main fire furnace 120 burns stably, the ammonia plasma igniter 110 can be closed. Under the residual heat of the main fire furnace 120 and the residual heat of the heat recovery pipe 150, the ammonia gas can still maintain the temperature required for combustion. At the same time, the ammonia gas output upward and downward from the main fire furnace 120 will not stop immediately after the ammonia plasma igniter 110 is closed. Therefore, the self-sustaining combustion of the ammonia plasma ignition and combustion system can be achieved, thereby ensuring the reliability of the use of the ammonia plasma ignition and combustion system. The ammonia plasma igniter 110 does not need to keep working all the time, thereby reducing the energy consumption of the ammonia plasma ignition and combustion system.

[0051] Embodiment 3:

[0052] 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:

[0053] The furnace body 100 is a flat rectangular parallelepiped structure, and includes an outer shell 101 and a vertical plate 102 . The vertical plate 102 divides the outer shell 101 into a combustion chamber and an assembly chamber. The ammonia plasma ignition combustion system and the main fire furnace 120 are both supported on the vertical plate 102 .

[0054] In this embodiment, since the heat recovery pipe 150, the main fire furnace 120 and the flame duct 117 are distributed in sequence from top to bottom, and the heat recovery pipe 150, the main fire furnace 120 and the flame duct 117 are all transversely extending tubular structures, the furnace body 100 is designed as a flat rectangular structure, which can better match the shape and layout of the heat recovery pipe 150, the main fire furnace 120 and the flame duct 117, thereby improving the structural compactness of the ammonia plasma ignition combustion system.

[0055] The vertical plate 102 can be used to support the ammonia plasma ignition and combustion system and the main fire furnace 120 to ensure the stability of the two, and also make the internal space layout of the shell 101 more reasonable. One side of the vertical plate 102 is a combustion chamber, and the other side is an assembly cavity, which is used to accommodate other components of the ammonia plasma ignition and combustion system, thereby improving the integrity of the ammonia plasma ignition and combustion system and further improving its structural compactness.

[0056] An air inlet can be opened on the housing 101 to meet air intake requirements.

[0057] The housing 101 may be provided with Figure 3 The expansion joint shown is used to balance the deformation of the shell 101 after being heated.

[0058] Embodiment 4:

[0059] Reference Figure 1-Figure 5 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0060] It also includes a gas supply pipeline 160, which is suitable for outputting combustion-supporting gas;

[0061] The gas supply pipeline 160 includes a first pipeline 161 and a second pipeline 162. The combustion chamber is divided into a first combustion zone facing the smoke outlet and a second combustion zone away from the smoke outlet with the main fire furnace 120 as a dividing line. The first pipeline 161 is connected to the first combustion zone, and the second pipeline 162 is connected to the second combustion zone. The first combustion zone and the second combustion zone are interconnected through the gap between the main fire furnace 120 and the furnace body 100; the furnace body 100 also includes a first shell 103 connected to the outer shell 101 for supporting the first pipeline 161. The inner cavity of the first shell 103 is connected to the combustion chamber through the vertical plate 102 hole opened on the vertical plate 102. The first pipeline 161 Suitable for outputting combustion-supporting gas to the inner cavity of the first shell 103; the furnace body 100 also includes a second shell 104 connected to the outer shell 101 and used to support the second pipeline 163162, the second pipeline 163162 penetrates the vertical plate 102 and extends into the combustion chamber, and the second pipeline 163162 is located below the flame guide 117, that is, located at the bottom of the combustion chamber; the second pipeline 163162 is located in the combustion chamber and the inner cavity of the second shell 104. A plurality of pipeline gas outlets are opened on the pipe section of the second pipeline 163162 located in the combustion chamber and the inner cavity of the second shell 104, and a gas channel is opened on the side of the first shell 103 and the second shell 104 close to the plasma igniter to supply combustion-supporting gas to the plasma igniter;

[0062] In this embodiment, the gas supply pipeline 160 can output a combustion-supporting gas such as air.

[0063] The gas supply pipeline 160 includes a first pipeline 161 and a second pipeline 163162. The first pipeline 161 is connected to the first combustion zone, and the second pipeline 163162 is connected to the second combustion zone, thereby ensuring that both the first combustion zone and the second combustion zone can obtain sufficient air to ensure that the ammonia can be fully burned.

[0064] The first combustion zone and the second combustion zone are connected to each other through the gap between the main fire furnace 120 and the furnace body 100 to ensure that the smoke after combustion can be output from the opening on the top of the furnace body 100, and to improve the uniformity of the temperature in the furnace body 100, thereby ensuring the reliability of the ammonia combustion process.

[0065] The second pipeline 163162 extends to the combustion chamber and is located below the flame duct 117, that is, at the very bottom of the combustion chamber. The hot gas in the combustion chamber will continue to rise, thus generating a negative pressure at the bottom of the combustion chamber, which is beneficial for the air in the second pipeline 163162 to efficiently enter the combustion chamber to ensure combustion efficiency.

[0066] The first pipeline 161 does not extend to the combustion chamber, so the rising hot gas is not likely to flow back into the first pipeline 161, ensuring that the first pipeline 161 can take in air normally.

[0067] Part of the air output by the first pipeline 161 and the second pipeline 163162 flows into the assembly cavity through the gas channel to be supplied to the plasma igniter for ignition, so that the plasma igniter does not need to be additionally provided with a combustion-supporting gas supply device, thereby simplifying the overall structure of the system.

[0068] The gas supply pipeline 160 also includes a third pipeline supported on the vertical plate 102 and connected to the combustion chamber. The third pipeline can be configured to penetrate the gas collecting box 130. The third pipeline is used to output combustion-supporting gas into the combustion chamber, thereby further improving the combustion efficiency of ammonia.

[0069] The combustion-supporting gas includes air, oxygen, etc., to help the fuel burn more completely and improve the combustion efficiency of ammonia. This embodiment takes air as an example.

[0070] The outlet of the third pipeline faces the second ammonia outlet, which helps to ensure that the ammonia output downward from the main fire furnace 120 is reliably ignited, thereby improving the reliability of the combustion system.

[0071] In an ammonia plasma ignition and combustion system, when an air inlet is provided on the shell 101, the first pipeline 161, the second pipeline 163162 and the third pipeline may not be provided, or one, two or all of the first pipeline 161, the second pipeline 163162 and the third pipeline may be provided.

[0072] In an ammonia plasma ignition and combustion system, when the housing 101 has no air inlet, at least the third pipeline or the second pipeline 163162 needs to be provided, and all of the first pipeline 161, the second pipeline 163162 and the third pipeline may be provided.

[0073] Embodiment 5:

[0074] Reference Figure 1 , Figure 2 and Figure 6 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0075] It also includes an ammonia injection device 170 connected to the inner cavity of the gas collecting box 130; the ammonia injection device 170 includes a jet tube 171 and a jet nozzle 172 located in the jet tube 171, the outlet end of the jet tube 171 is connected to the inner cavity of the gas collecting box 130, and when the jet nozzle 172 outputs ammonia, a second negative pressure zone can be formed between the jet tube 171 and the jet nozzle 172 to inhale air; the ammonia injection device 170 also includes an air intake damper 173 arranged in the second negative pressure zone; a narrow flow channel is formed in the middle of the jet tube 171, and the jet nozzle 172 extends toward the narrow flow channel; the jet tube 171 corresponds to the position on both sides of the axial direction of the narrow flow channel, forming a conical channel that gradually expands away from the narrow flow channel, and the conical channels are all connected to the narrow flow channel.

[0076] In this embodiment, a narrow flow channel is formed in the middle of the jet tube 171 to limit the initial flow rate and flow direction of the ammonia gas, thereby enhancing the stability and concentration of the jet.

[0077] The jet nozzle 172 extends into the narrow channel, and its function is to further accelerate the flow of ammonia gas and form a high-speed jet at the outlet of the nozzle 181. When ammonia gas is ejected through the jet nozzle 172, due to the increase in flow velocity and the contraction effect of the nozzle 181, a low-pressure area, i.e., a second negative pressure area, is generated between the jet tube 171 and the jet nozzle 172.

[0078] As mentioned above, the second negative pressure area is formed due to the Bernoulli effect generated when the jet nozzle 172 outputs ammonia. This negative pressure area not only helps to stabilize the jet of ammonia, but also provides power for the inhalation of external air, so that the mixed gas of ammonia and air output by the ammonia supply device is more conducive to the full combustion of ammonia and improves the combustion efficiency of ammonia; the principle of fluid mechanics is used to achieve automatic mixing of ammonia and air without the need for additional mixing equipment or energy.

[0079] The jet tubes 171 correspond to the positions on both sides of the axial direction of the narrow flow channel, forming tapered channels that gradually expand away from the narrow flow channel. These tapered channels are connected to the narrow flow channel, providing a larger space and a more complex flow field for further mixing of ammonia and air, which is conducive to the full mixing of ammonia and air.

[0080] The air intake damper 173 is arranged at the second negative pressure area to adjust and control the amount of air entering the tapered channel. By adjusting the opening of the air intake damper 173, the mixing ratio of ammonia and air can be accurately controlled to meet the needs under different working conditions. This design improves the flexibility and adaptability of the ammonia supply device.

[0081] The outlet end of the jet tube 171 is connected to the inner cavity of the gas collecting box 130, so that the ejected ammonia gas can directly enter the gas collecting box 130 and mix with the gas therein.

[0082] The air supply method in this embodiment can exist independently of the implementation forms in Example 2 and Example 3, or can exist simultaneously. It is preferred that they exist simultaneously to improve the combustion efficiency of ammonia.

[0083] Embodiment 6:

[0084] Reference Figure 1 , Figure 2 and Figure 7 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0085] The ammonia plasma igniter 110 also includes a connecting portion 111 and an ionization portion, wherein the outlet end of the ionization portion is connected to the inner cavity of the flame guide tube 117 through the connecting portion 111; the connecting portion 111 penetrates the gas collecting box 130 and is supported on the gas collecting box 130, and an air inlet hole is provided at a position of the gas collecting box 130 close to the inlet end of the connecting portion 111, and a first negative pressure zone is formed between the air inlet hole and the inlet end of the connecting portion 111, so that air is sucked into the inner cavity of the connecting portion 111; the front end of the connecting portion 111 is connected to the inner cavity of the flame guide tube 117; the connecting portion 111 is configured as a gradually expanding structure with the large end facing the flame guide tube 117; the ionization portion includes a plasma housing 112, an air inlet ceramic ring 113, an electrode 114 and a high-voltage cable 115; the electrode 114 supports On the inner wall of the air intake ceramic ring 113; the plasma shell 112 is connected to the rear end of the air intake ceramic ring 113; the rear end of the connecting part 111 is matched with the front end of the air intake ceramic ring 113 to form an air intake channel that allows air to enter the connecting part 111; the high-voltage cable 115 passes through the plasma shell 112 and is electrically connected to the electrode 114, and an ammonia inlet connected to the inner cavity of the air intake ceramic ring 113 is provided on the plasma shell 112; the front end of the air intake ceramic ring 113 forms a cyclone part that rotates the gas to output; the ammonia plasma igniter 110 also includes a conical net 116 supported in the flame guide tube 117, and the conical net 116 is set in two with the small ends close to each other, and the large end of one conical net 116 faces the connecting part 111.

[0086] 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 separately configure high-pressure air or adopt a blast air intake method, thereby reducing energy consumption.

[0087] The outlet end of the ionization part is connected to the inner cavity of the flame guide 117 through the connecting part 111, so as to ensure that the plasma can smoothly enter the inner cavity of the flame guide 117 and initiate a combustion reaction.

[0088] The connecting portion 111 is designed to be conical, with the large end facing the first flame guide tube 117. This design is not only conducive to the smooth flow of airflow, but also enhances the structural strength of the connecting portion 111, so that it can be stably supported on the gas collecting box 130, and can also diffuse the mixed gas when it is output by the connecting portion 111, which is conducive to improving the combustion efficiency of the mixed gas.

[0089] An air inlet hole is provided at the position of the air collecting box 130 near the inlet end of the connecting part 111, and a first negative pressure zone is formed between the air collecting box 130 and the inlet end of the connecting part 111. When the ionization part is working, the air flow in the connecting part 111 will produce a certain negative pressure effect, attracting air into the connecting part 111 from the air inlet hole. In this way, the air can be preliminarily mixed with the plasma generated by ionization in the connecting part 111, preparing for the subsequent combustion reaction. This natural air inhalation method simplifies the complexity of the air supply system, while improving the response speed and stability of the system.

[0090] Specifically, a plurality of air inlets may be provided and circumferentially distributed at the periphery of the inlet end of the connecting portion 111 to ensure that the connecting portion 111 has a sufficient air intake volume.

[0091] In this embodiment, an ammonia inlet is provided on the plasma shell 112 to allow ammonia to enter the interior of the ionization section. The air intake ceramic ring 113 is located at the front end of the plasma shell 112, and the electrode 114 is supported on its inner wall. The air intake ceramic ring 113 not only guides the airflow, but also optimizes the flow characteristics of the airflow through the cyclone section. When a high voltage current passes through the electrode 114, a high-temperature plasma is generated around it. The connection portion 111 is matched with the front end gap of the air intake ceramic ring 113 to form an air intake channel. This design allows air to enter the connection portion 111 through the air intake channel and mix with the plasma generated by ionization.

[0092] By adopting the layout in this embodiment, the structural compactness of the ammonia plasma igniter 110 can be optimized, thereby helping to reduce the overall space occupied by the ammonia plasma ignition and combustion system.

[0093] When the gas passes through the cyclone, it will be subjected to a certain rotational force, so that the gas is output in a rotating manner. The cyclone can be set as a spiral channel. The rotating airflow helps to enhance the turbulent mixing between the gases and improve the mixing uniformity of plasma and air, thereby accelerating the speed of the combustion reaction and improving the combustion efficiency.

[0094] The ammonia plasma igniter 110 further includes a conical net 116 supported in the first flame guide tube 117 . The conical nets 116 are provided in two with small ends close to each other, and a large end of one conical net 116 faces the connecting portion 111 .

[0095] In this embodiment, the conical net 116 is used to further disperse the burning ammonia output by the connecting portion 111, which is conducive to making it burn more evenly, thereby reducing energy consumption.

[0096] Embodiment 7:

[0097] Reference Figure 2 and Figure 8In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0098] It also includes a first injection module 180 and a second injection module 190 connected to the main fire furnace 120, the first injection module 180 and the second injection module 190 are both arranged in plurality, and the first injection module 180 is suitable for outputting ammonia gas to the upper side of the main fire furnace 120, and the second injection module 190 is suitable for outputting ammonia gas to the lower side of the main fire furnace 120; the first injection module 180 and the second injection module 190 both include a nozzle 181, a cover 182 and a turbine 183; one end of the nozzle 181 is connected to the inner cavity of the main fire furnace 120, the cover 182 is covered on the corresponding nozzle 181, the turbine 183 is connected to the outlet end of the cover 182 and rotates one by one along the first axis, and the first axis is parallel to the gas output direction of the nozzle 181, so that the turbine 183 can operate passively.

[0099] In this embodiment, the output end of the nozzle 181 can be set to a small hole structure to increase the output pressure of the burning mixture and reduce the output volume of the burning mixture, which is beneficial to saving energy consumption and improving energy utilization.

[0100] By setting a plurality of first injection modules 180 and second injection modules 190, multi-point injection and combustion can be achieved, thereby increasing the flame distribution range and density, improving the overall combustion efficiency, and reducing the combustion unevenness caused by local high or low temperatures. In addition, the adjacent first injection modules 180 and second injection modules 190 can also play a role in mutual auxiliary combustion. In other words, when one of the first injection modules 180 or the second injection module 190 burns, under mutual ignition, all the first injection modules 180 and the second injection modules 190 can burn reliably, thereby improving the reliability of the ammonia plasma ignition combustion system.

[0101] The passive operation of turbine 183 means that it rotates only by the impact force of the jet airflow without relying on an external power source. When nozzle 181 ejects a high-speed airflow, the airflow impacts the blades of turbine 183 and causes it to rotate. This mechanism not only simplifies the system structure, but also improves the reliability and stability of the system. Turbine 183 can break up the airflow output by nozzle 181 and make it evenly dispersed, which is conducive to further saving energy consumption, improving combustion uniformity, and improving energy utilization.

[0102] The rotation of the turbine 183 can also promote the mixing of the injected ammonia and air, enhance the turbulence in the combustion zone, and thus improve the combustion efficiency.

[0103] In the entire injection module, the nozzle 181 is responsible for injecting the mixed gas, and the turbine 183 optimizes the injection effect and promotes the combustion process through passive operation. The simultaneous operation of multiple modules makes the flame in the combustion zone more uniform and stable, and the combustion efficiency is significantly improved.

[0104] Embodiment 8:

[0105] Reference Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0106] The ammonia plasma ignition combustion system further includes an ammonia cracking catalyst 200 disposed in the main fire furnace 120 ; the ammonia cracking catalyst 200 includes a combination of one or more of a nickel-based, a ruthenium-based and an iron-based ammonia cracking catalyst 200 .

[0107] In this embodiment, the ammonia cracking catalyst 200 is used to promote the cracking of ammonia at high temperature, generate part of hydrogen to promote the combustion of ammonia, and further help improve the combustion efficiency of ammonia.

[0108] Preferably, the ammonia cracking catalyst 200 is located at the front end of the main fire furnace 120 to directly receive the ammonia output from the regenerative box 140 to improve the cracking efficiency of the ammonia.

[0109] Embodiment 9:

[0110] Reference Figure 2 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0111] It also includes a porous tube cover 210, which extends laterally and is located in the combustion chamber, and the porous tube cover 210 is located at the smoke outlet, such as above the heat recovery tube 150, to form a speed reduction zone at the open part of the furnace body 100 to reduce the smoke flow velocity.

[0112] In this embodiment, the porous pipe cover 210 mainly functions to reduce the upward flow velocity of the smoke in the combustion chamber below it, which is beneficial for the incompletely burned gas to have sufficient residence time to achieve complete combustion.

[0113] Embodiment 10:

[0114] Reference Figure 2 and Fig. 9 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0115] Two heat recovery pipes 150 are provided, and the two heat recovery pipes 150 are inclinedly arranged; an air flow channel extending along the length direction of the main fire furnace 120 and located above the main fire furnace 120 is formed between the two heat recovery pipes 150;

[0116] Preferably, one heat recovery pipe 150 has a high front end and a low rear end, and the other heat recovery pipe 150 has a low front end and a high rear end.

[0117] In this embodiment, two heat recovery pipes 150 are arranged and are inclined. Compared with a single horizontally arranged heat recovery pipe 150, the heating area of ​​the heat recovery pipe 150 can be increased, the amount of ammonia flowing in the heat recovery pipe 150 can be increased, and the heating effect of the ammonia preheating zone in the heat recovery pipe 150 can be improved.

[0118] The formation of the air flow channel can prevent the heat regeneration pipe 150 from blocking the flow of the flue gas, thereby ensuring the flow efficiency of the flue gas.

[0119] When one heat recovery pipe 150 has a high front end and a low rear end, and another heat recovery pipe 150 has a low front end and a high rear end, the airflow channel formed between the two heat recovery pipes 150 will produce a stronger convection effect because the two heat recovery pipes 150 are inclined in opposite directions. Hot air will naturally flow to one side during the rising process, while cold air will be replenished from the other side, forming a continuous cycle. This cycle can accelerate the transfer and diffusion of heat and improve the overall heating effect of the stove.

[0120] Embodiment 11:

[0121] In addition to providing a combustion method of an ammonia plasma ignition combustion system, the embodiment of the present invention is applied to the ammonia plasma ignition combustion system of any of the above embodiments. The combustion method includes:

[0122] S1: Control the ammonia plasma igniter 110 to work so that the flame guide 117 continuously outputs burning ammonia gas, so that the ignition zone heats the main fire furnace 120;

[0123] S2: Based on the main fire furnace 120 being heated to a specified temperature, ammonia is input into the main fire furnace 120, so that the ammonia output from the second ammonia outlet is ignited by the open flame of the ignition zone, and the ammonia output from the first ammonia outlet is ignited by the ammonia output from the ignited second ammonia outlet, or is ignited by the open flame of the ignition zone;

[0124] S3: Based on the continuous combustion of ammonia gas outputted from the main fire furnace 120, the ammonia plasma igniter 110 is controlled to stop working.

[0125] In this embodiment, the combustion method of the ammonia plasma ignition combustion system realizes efficient and stable self-sustaining combustion of ammonia through the above steps. The following is a detailed interpretation of each step of the method:

[0126] S1: Ignition and initial heating

[0127] First, the ammonia plasma igniter 110 is controlled to start working, so that the flame guide 117 continuously outputs burning ammonia gas. The burning ammonia gas directly acts on the ignition zone, thereby initially heating the main fire furnace 120.

[0128] Through high-energy ignition of the plasma igniter, the ammonia is quickly ignited and sufficient heat is generated to preheat the main fire furnace 120, creating conditions for subsequent stable combustion.

[0129] S2: Ammonia supply and combustion expansion

[0130] When the main fire furnace 120 is heated to a specified temperature, it indicates that the conditions for stable combustion are met.

[0131] At this time, ammonia gas is input into the inner cavity of the main fire furnace 120. The input ammonia gas is divided into two parts in the main fire furnace 120: one part is output downward and is directly ignited by the open flame in the ignition zone; the other part is output upward and is indirectly ignited by the ignited ammonia gas output downward or ignited by the open flame in the ignition zone.

[0132] S3: Stable combustion and igniter stop

[0133] When the ammonia gas outputted from the main fire furnace 120 continues to burn stably, it indicates that the system has entered a stable combustion state.

[0134] At this time, the ammonia plasma igniter 110 is controlled to stop working because the combustion in the main fire furnace 120 can be self-sustaining at this time, and there is no need to rely on the high-energy ignition of the plasma igniter.

[0135] Deactivating the plasma igniter saves energy and reduces system complexity and maintenance costs.

[0136] This combustion method achieves efficient and stable combustion of ammonia. It fully utilizes the high-energy ignition characteristics of the plasma igniter to start the combustion process and achieves self-sustaining combustion, which improves the thermal efficiency of the system and further enhances the overall performance of the system.

[0137] Embodiment 12:

[0138] The combustion method in Example 11 may specifically be:

[0139] S1: Control the ammonia plasma igniter 110 to work so that the flame guide 117 continuously outputs burning ammonia gas, so that the ignition zone heats the main fire furnace 120;

[0140] S2: Based on the main fire furnace 120 being heated to a specified temperature, the ammonia supply device is controlled to input ammonia into the inner cavity of the gas collecting box 130, so that the ammonia output from the second ammonia outlet is ignited by the open flame of the ignition zone, and the ammonia output from the first ammonia outlet is ignited by the ammonia output from the ignited second ammonia outlet, so that the preheating zone heats the heat recovery pipe 150;

[0141] S3: Based on the fact that the heat recovery pipe 150 is heated to a specified temperature and the ammonia gas output from the main fire furnace 120 continues to burn, the ammonia plasma igniter 110 is controlled to stop working.

[0142] In this embodiment, the combustion method of the ammonia plasma ignition combustion system realizes efficient and stable self-sustaining combustion of ammonia through the above steps. The following is a detailed interpretation of each step of the method:

[0143] S1: Ignition and initial heating

[0144] First, the ammonia plasma igniter 110 is controlled to start working, so that the flame guide 117 continuously outputs burning ammonia gas. The burning ammonia gas directly acts on the ignition zone, thereby initially heating the main fire furnace 120.

[0145] Through high-energy ignition of the plasma igniter, the ammonia is quickly ignited and sufficient heat is generated to preheat the main fire furnace 120, creating conditions for subsequent stable combustion.

[0146] S2: Ammonia supply and combustion expansion

[0147] When the main fire furnace 120 is heated to a specified temperature, it indicates that the conditions for stable combustion are met.

[0148] At this time, the ammonia supply device is controlled to input ammonia into the inner cavity of the gas collecting box 130. The input ammonia is divided into two parts in the main fire furnace 120: one part is output downward and directly ignited by the open flame in the ignition zone; the other part is output upward and indirectly ignited by the ignited ammonia output downward, or ignited by the open flame in the ignition zone. At the same time, the preheating zone heats the reheat pipe 150, thereby increasing the temperature of the ammonia flowing in the reheat pipe 150, which is conducive to further improving the combustion efficiency of the ammonia.

[0149] S3: Stable combustion and igniter stop

[0150] When the heat recovery pipe 150 is heated to a specified temperature and the ammonia gas output from the main fire furnace 120 continues to burn stably, it indicates that the system has entered a stable combustion state.

[0151] At this time, the ammonia plasma igniter 110 is controlled to stop working because the combustion in the main fire furnace 120 can be self-sustaining at this time, and there is no need to rely on the high-energy ignition of the plasma igniter.

[0152] Deactivating the plasma igniter saves energy and reduces system complexity and maintenance costs.

[0153] This combustion method achieves efficient and stable combustion of ammonia. It fully utilizes the high-energy ignition characteristics of the plasma igniter to start the combustion process and achieves self-sustaining combustion, which improves the thermal efficiency of the system and further enhances the overall performance of the system.

[0154] It can be understood that, except for any conflicting parts, the above-mentioned embodiments 1-12 can be freely combined to form other implementation modes of the present invention.

[0155] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0156] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0157] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be 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 be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0158] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0159] So 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 easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An ammonia plasma ignition and combustion system, characterized in that: include: A furnace body (100), wherein a combustion chamber with an open top is formed in the furnace body (100), so that a smoke outlet is formed at the top of the combustion chamber; an ammonia plasma igniter (110), supported on the furnace body (100), adapted to receive and ignite ammonia gas, and comprising a flame conduit (117) whose front end extends transversely into the combustion chamber and outputs the burning ammonia gas; A main fire furnace (120) is supported on the furnace body (100) and has a front end extending transversely into the combustion chamber. The main fire furnace (120) is provided with a plurality of first ammonia outlets and second ammonia outlets along the rising direction of the smoke and away from the rising direction of the smoke. The main fire furnace (120) is suitable for receiving ammonia; The main fire furnace (120) and the flame duct (117) are arranged in a direction opposite to the rising direction of the smoke, so as to form an ignition zone between the flame duct (117) and the main fire furnace (120).

2. The ammonia plasma ignition and combustion system according to claim 1, characterized in that: Also includes: A gas collecting box (130), connected to the rear end of the main fire furnace (120) and in communication with the main fire furnace (120), suitable for receiving ammonia gas; A heat recovery box (140) connected to the front end of the main fire furnace (120) and communicated with the main fire furnace (120); A heat recovery pipe (150) is connected to the gas collecting box (130) and the heat recovery box (140), so that the gas collecting box (130) outputs ammonia to the main fire furnace (120) and the heat recovery pipe (150) respectively; The heat recovery pipe (150), the main fire furnace (120) and the flame duct (117) are sequentially distributed in the opposite direction of the rising direction of the smoke to form a preheating zone between the main fire furnace (120) and the heat recovery pipe (150).

3. The ammonia plasma ignition and combustion system according to claim 2, characterized in that: The furnace body (100) is a flat rectangular parallelepiped structure, comprising an outer shell (101) and a vertical plate (102), wherein the vertical plate (102) divides the outer shell (101) into a combustion chamber and an assembly chamber, and the ammonia plasma ignition combustion system and the main fire furnace (120) are both supported on the vertical plate (102); An air inlet can be provided on the housing (101); It also includes a gas supply pipeline (160), wherein the gas supply pipeline (160) is suitable for outputting combustion-supporting gas; The gas supply pipeline (160) comprises a first pipeline (161) and a second pipeline (162); the combustion chamber is divided into a first combustion zone facing the smoke outlet and a second combustion zone away from the smoke outlet with the main fire furnace (120) as a dividing line; the first pipeline (161) is connected to the first combustion zone, and the second pipeline (162) is connected to the second combustion zone; the first combustion zone and the second combustion zone are interconnected through a gap between the main fire furnace (120) and the furnace body (100); The furnace body (100) further comprises a first shell (103) connected to the outer shell (101) and used to support the first pipeline (161); the inner cavity of the first shell (103) is connected to the combustion chamber through a vertical plate (102) hole opened on the vertical plate (102); and the first pipeline (161) is suitable for outputting combustion-supporting gas to the inner cavity of the first shell (103); The furnace body (100) further comprises a second shell (104) connected to the outer shell (101) and used for supporting the second pipeline (162), wherein the second pipeline (162) passes through the vertical plate (102) and extends into the combustion chamber, and the second pipeline (162) is located below the flame guide (117); The second pipeline (162) is provided with a plurality of pipeline gas outlets on the pipe section located in the inner cavity of the combustion chamber and the second shell (104), and the first shell (103) and the second shell (104) are both provided with gas channels on one side close to the plasma igniter; The gas supply pipeline (160) comprises a third pipeline (163) supported on the vertical plate (102) and connected to the combustion chamber, and the outlet of the third pipeline (163) faces the second ammonia outlet.

4. The ammonia plasma ignition and combustion system according to claim 2, characterized in that: It also includes an ammonia injection device (170) that is in communication with the inner cavity of the gas collecting box (130); The ammonia injection device (170) comprises a jet tube (171) and a jet nozzle (172) located in the jet tube (171); the outlet end of the jet tube (171) is connected to the inner cavity of the gas collecting box (130); when the jet nozzle (172) outputs ammonia, a second negative pressure area can be formed between the jet tube (171) and the jet nozzle (172) to inhale air; The ammonia injection device (170) further includes an air intake damper (173) disposed in the second negative pressure zone; A narrow flow channel is formed in the middle of the jet tube (171), and the jet nozzle (172) extends toward the narrow flow channel; The jet tubes (171) are located at positions corresponding to the axial sides of the narrow flow channel, forming tapered channels that gradually expand in a direction away from the narrow flow channel, and the tapered channels are all connected to the narrow flow channel.

5. The ammonia plasma ignition and combustion system according to claim 2, characterized in that: The ammonia plasma igniter (110) further comprises a connecting portion (111) and an ionizing portion, wherein an outlet end of the ionizing portion is connected to the inner cavity of the flame guide tube (117) through the connecting portion (111); The connecting portion (111) can penetrate the gas collecting box (130) and be supported on the gas collecting box (130), and the front end of the connecting portion (111) is in communication with the inner cavity of the flame guide tube (117); The connecting portion (111) is configured as a gradually expanding structure with a large end facing the flame guide tube (117); The ionization part comprises a plasma housing (112), an air intake ceramic ring (113), an electrode (114) and a high-voltage cable (115); The electrode (114) is supported on the inner wall of the air intake ceramic ring (113); the plasma housing (112) is connected to the rear end of the air intake ceramic ring (113); The rear end of the connecting portion (111) is gap-matched with the front end of the air intake ceramic ring (113) to form an air intake passage that allows air to enter the connecting portion (111); the high-voltage cable (115) passes through the plasma housing (112) and is electrically connected to the electrode (114); the plasma housing (112) is provided with an ammonia inlet that communicates with the inner cavity of the air intake ceramic ring (113); The front end of the air intake ceramic ring (113) forms a cyclone portion for rotating and outputting the gas; The ammonia plasma igniter (110) further comprises a conical net (116) supported in the flame guide tube (117), wherein the conical net (116) is provided in two portions with small ends close to each other, and a large end of one of the conical nets (116) faces the connecting portion (111).

6. The ammonia plasma ignition and combustion system according to claim 1 or 2, characterized in that: It also includes a plurality of first injection modules (180) and second injection modules (190), wherein the first injection modules (180) are disposed at the first ammonia outlets in a one-to-one correspondence, and the second injection modules (190) are disposed at the second ammonia outlets in a one-to-one correspondence; The first injection module (180) and the second injection module (190) each include a nozzle (181), a cover (182) and a turbine (183); One end of each of the nozzles (181) is connected to the inner cavity of the main fire furnace (120); the cover (182) is disposed on the corresponding nozzle (181); the turbine (183) is connected to the outlet end of the cover (182) in a one-to-one rotation along a first axis; the first axis is parallel to the gas output direction of the nozzle (181) so that the turbine (183) can operate passively.

7. The ammonia plasma ignition and combustion system according to claim 2, characterized in that: The ammonia plasma ignition combustion system further comprises an ammonia cracking catalyst (200) disposed in the main fire furnace (120); The ammonia cracking catalyst (200) comprises a combination of one or more of a nickel-based, a ruthenium-based and an iron-based ammonia cracking catalyst (200); The ammonia cracking catalyst (200) is located at the front end of the main fire furnace (120) to directly receive the ammonia gas output from the heat recovery box (140).

8. The ammonia plasma ignition and combustion system according to claim 3, characterized in that: It also comprises a porous pipe cover (210), which extends transversely and is located in the combustion chamber. The porous pipe cover (210) is located at the smoke outlet to form a velocity reduction zone for reducing the smoke flow velocity.

9. The ammonia plasma ignition and combustion system according to claim 2, characterized in that: The number of the heat recovery pipes (150) is two, and the two heat recovery pipes (150) are arranged obliquely; an air flow channel extending along the length direction of the main fire furnace (120) is formed between the two heat recovery pipes (150).

10. A combustion method of an ammonia plasma ignition combustion system, characterized in that: The ammonia plasma ignition combustion system applied to any one of claims 1 to 9, wherein the combustion method comprises: S1: the ammonia plasma igniter (110) operates to make the flame guide (117) continuously output burning ammonia gas, so that the ignition zone heats the main fire furnace (120); S2: when the main fire furnace (120) is heated to a specified temperature, ammonia is input into the main fire furnace (120), so that the ammonia outputted from the second ammonia outlet is ignited by the open flame of the ignition zone, and the ammonia outputted from the first ammonia outlet is ignited by the ammonia outputted from the second ammonia outlet that has been ignited, or is ignited by the open flame of the ignition zone; S3: Based on the continuous combustion of the ammonia gas output from the main fire furnace (120), the ammonia plasma igniter (110) is controlled to stop working.

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