An ammonia burner with a pre-chamber

Abstract

The application discloses an ammonia combustor capable of forming pre-combustion cage flame inside, which is provided with a gas flow pipeline in a combustor shell, and is provided with an air inlet for injecting air into the inside of the combustor shell; the gas flow pipeline comprises an ammonia gas pipeline with an air inlet located outside the combustor shell and an air outlet located inside the front end of the combustor shell, and a gas pipeline with an air inlet located outside the combustor shell, an air outlet located inside the front end of the combustor shell and located behind the air outlet of the ammonia gas pipeline; the combustor shell is provided with guide vanes for providing air to the gas at the air outlet of the ammonia gas pipeline and the gas at the air outlet of the gas pipeline, and wrapping the gas at the air outlet of the ammonia gas pipeline and the gas at the air outlet of the gas pipeline to move to the outside of the front end of the combustor shell. The application provides a high-temperature and oxygen-deficient atmosphere for ammonia gas, so that the ammonia gas is decomposed into hydrogen and nitrogen as much as possible, and the combustion heating and self-decomposition of the ammonia gas are realized.

Description

Technical Field

[0001] This invention relates to the field of burner technology, specifically to an ammonia burner that can form a pre-combustion cage flame inside. Background Technology

[0002] Currently, countries worldwide are actively seeking effective methods to reduce carbon dioxide emissions. Faced with the urgent need for carbon reduction, ammonia fuel, due to its "zero-carbon, hydrogen-rich" characteristics, has received unprecedented attention in recent years. Ammonia fuel can be produced carbon-free through renewable electricity and transported safely and efficiently in liquid ammonia form. Furthermore, ammonia fuel has a high hydrogen density, allowing it to be directly burned in energy power devices such as gas turbines, electric boilers, and internal combustion engines without a dehydrogenation process. However, compared to traditional fossil fuels such as oil and natural gas, ammonia fuel has unique properties such as difficulty in ignition, slow flame propagation, difficulty in flame stabilization, and a potential tendency for high nitrogen oxide emissions. These are key issues that must be considered when burning ammonia. To achieve efficient, stable, safe, and clean combustion of ammonia fuel, burner design is crucial. Therefore, it is essential to design a burner suitable for burning ammonia fuel (including pure ammonia or ammonia-blended fuels) to obtain better ignition, stable combustion, burnout, and emission characteristics that meet the normal operation requirements of boilers and other combustion devices.

[0003] Chinese patent document (CN115264496A) discloses an ammonia burner and its control method, which can achieve pure ammonia combustion and ammonia-blended combustion of carbon-based fuels. However, in this patent document, pure ammonia combustion requires a certain amount of ammonia to be decomposed into hydrogen and nitrogen by an additional external ammonia decomposer. The hydrogen formed by decomposition has a combustion-supporting function, while the nitrogen in the ammonia, after decomposition into nitrogen gas, reduces the formation of nitrogen oxides. However, the presence of the additional ammonia decomposer leads to a complex burner structure, high manufacturing difficulty, large installation and usage space requirements, and limited application scope.

[0004] Chinese patent document (CN217763418U) discloses a catalytic staged ammonia burner, proposing to use a catalyst to decompose ammonia fuel into hydrogen for combustion as much as possible, reducing the generation of nitrogen oxides, achieving similar effects to the aforementioned patent document (CN115264496A). However, the pure ammonia combustion in this patent document involves catalytically converting ammonia into hydrogen for combustion as much as possible. The catalyst is expensive, requiring regular replacement and maintenance, and its catalytic structure is complex, making it difficult to process and use. Furthermore, the effectiveness of ammonia catalytic conversion and low-NOx combustion remains to be evaluated.

[0005] Chinese patent document (CN113294801A) discloses a combustion device and its control method for achieving efficient and clean combustion of pure ammonia. This device achieves efficient and stable combustion of pure ammonia without mixing with other combustible gases, while simultaneously achieving low-level emissions of nitrogen oxides in the combustion exhaust gas within a single combustion chamber. However, this patent requires the ammonia to pass through an additional ammonia pyrolysis electric heater to partially pyrolyze the ammonia into hydrogen and nitrogen. Furthermore, the heater uses an ammonia pyrolysis catalyst, resulting in high cost and a complex structure.

[0006] Chinese patent document (CN112648113A) discloses a green and efficient ammonia fuel combustion system and method. By appropriately adjusting the fuel supply, pollutant emissions are controlled at a low level, while also solving the problem of poor ignition of ammonia as a fuel. However, the green and efficient combustion of ammonia in this patent document requires the use of additional methane cracking and ammonia decomposition devices to partially convert methane and ammonia into hydrogen for combustion, resulting in a complex structure and difficult maintenance.

[0007] Chinese patent document (CN112902163A) discloses a hydrogen-infused low-NOx combustion system and method based on ammonia decomposition. This system decomposes ammonia into hydrogen, which is used as the combustion gas, and air is used as the oxygen supply. This solves the hydrogen transportation problem, increases the combustion heat release rate, and reduces nitrogen oxide emissions. However, this patent requires the additional installation of an ammonia decomposition device and a nitrogen removal device, resulting in high processing costs and a complex structure.

[0008] Chinese patent document (CN216244251U) discloses a rapid ammonia pyrolysis and combustion device that can rapidly decompose ammonia into hydrogen and achieve hydrogen combustion, thereby reducing the large amount of carbon dioxide emissions caused by conventional coal combustion and avoiding environmental pollution. However, this patent document requires the installation of a catalytic cartridge inside the ammonia inlet gun, and the use of a costly catalyst, resulting in a complex catalytic structure and high costs for regular replacement and maintenance.

[0009] The above analysis reveals that cracking ammonia through high-temperature pyrolysis and catalytic conversion before combustion is an effective method to reduce nitrogen oxide formation and promote fuel ignition and combustion. However, existing technologies have the following problems and shortcomings: ammonia burners are designed to decompose ammonia into hydrogen using external or internal catalytic and cracking components before combustion or combustion support. Such burners have complex structures, high costs, are difficult to maintain, and their catalytic conversion efficiency remains to be assessed. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide an ammonia burner that achieves efficient and stable combustion by forming a pre-combustion cage flame inside.

[0011] To achieve this objective, the present invention designs an ammonia burner capable of forming a pre-combustion cage flame internally, comprising a burner housing, a gas flow pipe disposed within the burner housing, and an air inlet on the burner housing for injecting air into its interior; the gas flow pipe includes an ammonia pipe with an inlet located outside the burner housing and an outlet located inside the front end of the burner housing, and a gas pipe with an inlet located outside the burner housing and an outlet located inside the front end of the burner housing and behind the outlet of the ammonia pipe; the burner housing is provided with guide vanes for supplying air to the gas at the outlet of the ammonia pipe and the gas at the outlet of the gas pipe, and for enveloping the gas at the outlet of the ammonia pipe and the gas at the outlet of the gas pipe to move towards the front end of the burner housing.

[0012] Furthermore, the gas flow pipeline has a sleeve structure, and the gas pipeline is coaxially and fixedly connected to the ammonia pipeline.

[0013] Furthermore, the front end of the ammonia pipeline is a closed structure, and multiple ammonia outlet holes are spaced apart along its circumferential direction at the front end of the ammonia pipeline.

[0014] Furthermore, the inner surface of the front end of the gas pipeline is coaxially fixedly connected to the outer circumferential surface of the ammonia pipeline, and the front end of the gas pipeline is provided with a plurality of gas outlet holes spaced apart along its circumferential direction, the gas outlet holes being located behind the ammonia outlet holes.

[0015] Furthermore, both the front end of the ammonia pipeline and the front end of the gas pipeline are frustoconical closed structures with a smaller front end and a larger rear end.

[0016] Furthermore, both the ammonia outlet and the fuel gas outlet are obliquely cut holes that are inclined toward the front end of the burner housing.

[0017] Furthermore, the guide vane has an annular structure, with its central part coaxially fixed to the gas pipeline, the outer surface of the guide vane fixed to the inner surface of the burner housing, and the guide vane located behind the gas outlet of the gas pipeline.

[0018] Furthermore, the inner side of the guide vane is provided with a plurality of direct-flow air holes spaced apart along its circumferential direction for supplying air to the gas outlet of the gas pipeline and the gas outlet of the ammonia pipeline.

[0019] Furthermore, the outer side of the guide vane is provided with a plurality of swirling air slots that extend from the outer surface of the guide vane toward the inner side of the guide vane, and are used to wrap the gas at the outlet of the gas pipeline and the gas at the outlet of the ammonia pipeline and move toward the front end of the burner housing.

[0020] Furthermore, the ratio of the ventilation area of ​​the DC air hole to the ventilation area of ​​the swirling air groove is 1:5 to 1:6.

[0021] The beneficial effects of this invention are as follows: This invention, through a sleeve-type gas flow pipeline structure, provides a high-temperature, oxygen-deficient atmosphere for ammonia in the form of a pre-combustion cage flame, allowing ammonia to decompose into hydrogen and nitrogen as much as possible. This achieves combustion heating and autothermal decomposition of ammonia, making it easier to ignite and stably burn. It also achieves low nitrogen oxide generation and emissions, while avoiding the use of complex and costly ammonia catalytic conversion devices. The ammonia burner designed in this invention has a simple structure, low maintenance costs, and avoids complex pipeline designs. The guide vanes are equipped with inner and outer air outlets. The inner air outlet provides direct air to prevent gas backflow and cool the pipeline wall, while the outer air outlet provides swirling air, enveloping the ammonia gas flow forward and providing most of the air required for ammonia combustion, promoting combustion and stable combustion, and achieving controllable combustion-air separation. In this invention, both the ammonia pipeline outlet and the gas pipeline outlet have small holes with a certain oblique angle. This structure makes the gas and air in the pre-combustion cage flame mix more evenly, while also making the ammonia more concentrated and evenly distributed within the high-temperature, oxygen-deficient atmosphere provided by the pre-combustion cage flame. The outlet end of the ammonia pipeline has a chamfer to avoid localized high-temperature zones in front of the outlet, which could damage the burner and generate high levels of nitrogen oxides. This invention innovatively proposes a high-temperature, oxygen-deficient atmosphere created by a pre-combustion cage flame, maximizing the conversion of ammonia into hydrogen, thus achieving self-heating decomposition for combustion heating. This invention does not rely on catalytic conversion or decomposition components, resulting in a simple structure, high reliability, and low manufacturing, operation, and maintenance costs. It also solves the problems of difficult ammonia fuel ignition, slow flame propagation, difficulty in flame stabilization, and high nitrogen oxide emissions. The ammonia burner designed using this invention can extend the service life of existing power plant boilers and generator sets, solving the problem of premature generator set retirement due to carbon dioxide emission restrictions. The ammonia burner designed in this invention can be used for ammonia-blended combustion retrofitting of coal, oil, and gas-fired boilers, as well as for other combustion thermal devices such as gas turbines, glass kilns, cement kilns, and blast furnaces, reducing carbon dioxide emissions at the source without requiring extensive modifications to existing combustion equipment. Attached Figure Description

[0022] Figure 1This is a perspective view of an ammonia burner in Embodiment 1 of the present invention, which can form a pre-combustion cage flame inside;

[0023] Figure 2 This is a perspective view of the internal structure of an ammonia burner capable of forming a pre-combustion cage flame in Embodiment 1 of the present invention.

[0024] Figure 3 This is a three-dimensional structural view of the gas flow pipeline in Embodiment 1 of the present invention;

[0025] Figure 4 This is a perspective view of the guide vane in Embodiment 1 of the present invention;

[0026] Figure 5 This is a front view of the guide vane in Embodiment 1 of the present invention;

[0027] Figure 6 This is an axial cross-sectional view of an ammonia burner in Embodiment 1 of the present invention, which can form a pre-combustion cage flame inside.

[0028] Figure 7 This is a schematic diagram of the combustion state of an ammonia burner in Embodiment 1 of the present invention, which can form a pre-combustion cage flame inside.

[0029] Figure 8 This is a perspective view of an ammonia burner in Embodiment 2 of the present invention, which can form a pre-combustion cage flame inside;

[0030] Figure 9 This is a perspective view of the internal structure of an ammonia burner capable of forming a pre-combustion cage flame in Embodiment 2 of the present invention;

[0031] Figure 10 This is a perspective view of the guide vane in Embodiment 2 of the present invention;

[0032] Figure 11 This is a front view of the guide vane in Embodiment 2 of the present invention;

[0033] Figure 12 This is an axial cross-sectional view of an ammonia burner in Embodiment 2 of the present invention, which can form a pre-combustion cage flame inside.

[0034] Figure 13 This is a schematic diagram of the combustion state of an ammonia burner in Embodiment 2 of the present invention, in which a pre-combustion cage flame can be formed internally;

[0035] Wherein, 1—burner shell, 2—air inlet, 3—ammonia pipeline, 4—gas pipeline, 5—guide vane, 6—ammonia outlet, 7—gas outlet, 8—direct flow air hole, 9—swirl air groove, 10—pre-combustion cage flame zone, 11—ammonia flame zone, 12—ammonia decomposition zone, 13—ammonia combustion zone, 14—ammonia burnout zone, 15—gas inlet. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Embodiment 1 of the ammonia burner designed in this invention, which can form a pre-combustion cage flame internally, is as follows: Figure 1 As shown in Figure 6, the device includes a burner housing 1, an air inlet 2 for injecting air into the burner housing 1, and a gas flow pipe inside the burner housing 1. The gas flow pipe includes an ammonia pipe 3 with an air inlet located outside the burner housing 1 and an air outlet located inside the front end of the burner housing 1, and a gas pipe 4 with an air inlet located outside the burner housing 1 and an air outlet located inside the front end of the burner housing 1 and located behind the air outlet of the ammonia pipe 3. Inside the burner housing 1, there are guide vanes 5 for supplying air to the gas at the air outlet of the ammonia pipe 3 and the gas at the air outlet of the gas pipe 4, and for enveloping the gas at the air outlet of the ammonia pipe 3 and the gas at the air outlet of the gas pipe 4 to move towards the front end of the burner housing 1.

[0038] like Figure 2 —3 and Figure 6 As shown, the gas flow pipeline has a sleeve-type structure, with both ends of the gas pipeline 4 coaxially fixed to the ammonia pipeline 3. The front end of the ammonia pipeline 3 is a closed structure with a chamfered edge, and multiple ammonia outlet holes 6 are spaced apart along its circumference at the front end of the ammonia pipeline 3. Multiple gas outlet holes 7 are also spaced apart along their circumference at the front end of the gas pipeline 4, located behind the ammonia outlet holes 6. The front end of the gas pipeline 4 also has a chamfered edge. Both the ammonia outlet holes 6 and the gas outlet holes 7 are obliquely cut holes facing the front end of the burner housing 1, with an oblique angle of 45°.

[0039] like Figure 2 and Figure 4 As shown in Figure 6, the guide vane 5 has an annular structure, with its central part coaxially fixed to the gas pipeline 4. The outer surface of the guide vane 5 is fixed to the inner surface of the burner housing 1, and the guide vane 5 is located behind the gas outlet of the gas pipeline 4. Multiple direct-flow air holes 8 are spaced apart along the circumferential direction on the inner side of the guide vane 5 to supply air to the gas outlets of the gas pipeline 4 and the ammonia pipeline 3. Multiple swirling air grooves 9 are spaced apart along the circumferential direction on the outer side of the guide vane 5, extending from the outer surface of the guide vane 5 to the inner side of the guide vane 5, to enclose the gas at the outlets of the gas pipeline 4 and the ammonia pipeline 3 and move it towards the front end of the burner housing 1. The groove surface of the swirling air grooves 9 is a swirling inclined plane at a 15° angle to the horizontal. The ratio of the ventilation area of ​​the direct-flow air holes 8 to the ventilation area of ​​the swirling air grooves 9 is 1:6.

[0040] like Figure 7As shown, the method of using the ammonia burner in Embodiment 1 of this invention is as follows: Before injecting ammonia for combustion, natural gas is first injected through gas pipeline 4 for fuel-rich combustion, providing a high-temperature, oxygen-deficient combustion atmosphere, with a natural gas concentration of 1.7. After the pre-combustion cage flame combustion provides a high-temperature, oxygen-deficient atmosphere, ammonia is injected from ammonia pipeline 3 and ejected from ammonia outlet 6. At this time, the ammonia can be converted into hydrogen and nitrogen as much as possible in the pre-combustion cage flame zone. The decomposed ammonia is easier to ignite and burn stably, achieving lower nitrogen oxide generation and emissions, and avoiding the use of complex and costly ammonia catalytic conversion devices.

[0041] Embodiment two of the ammonia burner designed in this invention, which can form a pre-combustion cage flame internally, is as follows: Figure 8 As shown in Figure 12, the device includes a burner housing 1 with a chamfered front end. An air inlet 2 is provided on the burner housing 1 for injecting air into it. A gas flow pipe is provided inside the burner housing 1. The gas flow pipe includes an ammonia pipe 3 with its inlet located outside the burner housing 1 and its outlet located inside the front end of the burner housing 1, and a gas pipe 4 with its inlet located outside the burner housing 1 and its outlet located inside the front end of the burner housing 1, and located behind the outlet of the ammonia pipe 3. A guide vane 5 is provided inside the burner housing 1 to supply air to the gas at the outlet of the ammonia pipe 3 and the gas at the outlet of the gas pipe 4, and to enclose the gas at the outlet of the ammonia pipe 3 and the gas at the outlet of the gas pipe 4, allowing them to move towards the outside of the front end of the burner housing 1.

[0042] like Figure 9 and Figure 12 As shown, the gas flow pipeline has a sleeve-type structure, with both ends of the gas pipeline 4 coaxially fixed to the ammonia pipeline 3. The front end of the ammonia pipeline 3 is a closed structure with a chamfered edge, and multiple ammonia outlet holes 6 are spaced apart along its circumference at the front end of the ammonia pipeline 3. Multiple gas outlet holes 7 are also spaced apart along their circumference at the front end of the gas pipeline 4, located behind the ammonia outlet holes 6. The front end of the gas pipeline 4 also has a chamfered edge. Both the ammonia outlet holes 6 and the gas outlet holes 7 are obliquely cut holes facing the front end of the burner housing 1, with an oblique angle of 45°.

[0043] like Figure 9As shown in Figure 12, the guide vane 5 has an annular structure, with its central part coaxially fixed to the gas pipeline 4. The outer surface of the guide vane 5 is fixed to the inner surface of the burner housing 1, and the guide vane 5 is located behind the gas outlet of the gas pipeline 4. Two rings of direct-flow air holes 8 are spaced apart along the radial direction on the inner side of the guide vane 5. Each ring of direct-flow air holes 8 includes direct-flow air holes 8 spaced apart along the circumferential direction of the guide vane 5. The direct-flow air holes 8 are used to supply air to the gas at the gas outlet of the gas pipeline 4 and the gas at the gas outlet of the ammonia pipeline 3. Multiple swirling air grooves 9 are spaced apart along the circumferential direction on the outer side of the guide vane 5, extending from the outer surface of the guide vane 5 to the inner side of the guide vane 5, and used to enclose the gas at the gas outlet of the gas pipeline 4 and the gas outlet of the ammonia pipeline 3, moving them towards the front end of the burner housing 1. The groove surface of the swirling air grooves 9 is a swirling inclined plane at a 15° angle to the horizontal direction. The ratio of the ventilation area of ​​the DC air hole 8 to the ventilation area of ​​the swirling air groove 9 is 1:6.

[0044] like Figure 13 As shown, the method of using the ammonia burner in Embodiment 2 of this invention is as follows: Before injecting ammonia for combustion, natural gas is first injected through the gas pipeline 4 for fuel-rich combustion, providing a high-temperature, oxygen-deficient combustion atmosphere, with a natural gas concentration of 1.7. After the pre-combustion cage flame provides a high-temperature, oxygen-deficient atmosphere, ammonia is injected from the ammonia pipeline 3 and ejected from the ammonia outlet 6. At this time, the ammonia can be converted into hydrogen and nitrogen as much as possible in the pre-combustion cage flame zone. The decomposed ammonia is easier to ignite and burn stably, achieving lower nitrogen oxide generation and emissions, and avoiding the use of complex and costly ammonia catalytic conversion devices. Compared with Embodiment 1, Embodiment 2 optimizes the front end structure of the burner shell 1 into a chamfered structure and increases the number of direct-flow air holes 8, further preventing high-temperature flames from damaging the ammonia burner at the front end. At the same time, more direct-flow air holes 8 further meet the requirements for ammonia burnout and stable combustion.

[0045] In summary, this invention, through a sleeve-type gas flow pipeline structure, provides a high-temperature, oxygen-deficient atmosphere for ammonia in the form of a pre-combustion cage flame, enabling the ammonia to decompose into hydrogen and nitrogen as much as possible. This achieves combustion heating and autothermal decomposition of ammonia, making it easier to ignite and stably burn. It also achieves low nitrogen oxide generation and emissions, while avoiding the use of complex and costly ammonia catalytic conversion devices. The ammonia burner designed in this invention has a simple structure, low maintenance costs, and avoids complex piping designs. The guide vane 5 is equipped with inner and outer air outlets. The inner air outlet provides direct air to prevent gas backflow and cool the pipeline wall, while the outer air outlet provides swirling air that envelops the ammonia gas flow forward, providing most of the air required for ammonia combustion, promoting combustion and stable combustion, and achieving controllable combustion-air separation. In this invention, both the outlet of the ammonia pipeline 3 and the outlet of the gas pipeline 4 have small holes with a certain bevel angle. This structure allows for a more uniform mixing of the gas and air in the pre-combustion cage flame, while also ensuring a more concentrated and even distribution of ammonia within the high-temperature, oxygen-deficient atmosphere provided by the pre-combustion cage flame. The outlet end of the ammonia pipeline 4 has a certain chamfer to prevent localized high-temperature zones in front of the ammonia pipeline outlet, which could damage the burner and generate high levels of nitrogen oxides. This invention innovatively proposes a concept of ammonia combustion that creates a high-temperature, oxygen-deficient atmosphere using a pre-combustion cage flame, enabling the conversion of ammonia into hydrogen as much as possible, thus achieving self-heating decomposition for combustion heating. This invention does not rely on catalytic conversion or decomposition components, has a simple structure, high reliability, and low manufacturing, operation, and maintenance costs. It also solves the problems of difficult ammonia fuel ignition, slow flame propagation, difficult flame stabilization, and high nitrogen oxide emissions. The ammonia burner designed using this invention can extend the service life of existing power plant boilers and generator sets, solving the problem of generator sets being forced to retire prematurely due to carbon dioxide emission restrictions. The ammonia burner designed in this invention can be used for ammonia-blended combustion retrofitting of coal-fired, oil-fired, and gas-fired boilers, as well as other combustion thermal devices such as gas turbines, glass kilns, cement kilns, and steel blast furnaces. It reduces carbon dioxide emissions at the source without requiring extensive modifications to existing combustion devices.

[0046] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the structure of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An ammonia burner in which a pre-chambered flame can be formed internally, comprising a burner housing (1), characterized in that: The combustor shell (1) is provided with a gas flow pipeline, and the combustor shell (1) is provided with an air inlet (2) for injecting air into the interior thereof; The gas flow pipeline comprises an ammonia gas pipeline (3) with an air inlet located outside the combustor shell (1) and an air outlet located inside the front end of the combustor shell (1), and a gas pipeline (4) with an air inlet located outside the combustor shell (1), an air outlet located inside the front end of the combustor shell (1) and located behind the air outlet of the ammonia gas pipeline (3); The combustor shell (1) is provided with a guide vane (5) for providing air to the gas at the air outlet of the ammonia gas pipeline (3) and the gas at the air outlet of the gas pipeline (4) and wrapping the gas at the air outlet of the ammonia gas pipeline (3) and the gas at the air outlet of the gas pipeline (4) to move to the outside of the front end of the combustor shell (1); the gas flow pipeline is a sleeve structure, the gas pipeline (4) is coaxially fixedly connected to the ammonia gas pipeline (3); the front end of the ammonia gas pipeline (3) is a closed structure, a plurality of ammonia gas air outlets (6) are spaced apart along the circumferential direction of the front end of the ammonia gas pipeline (3); the inner surface of the front end of the gas pipeline (4) is coaxially fixedly connected to the circumferential outer surface of the ammonia gas pipeline (3), a plurality of gas air outlets (7) are spaced apart along the circumferential direction of the front end of the gas pipeline (4), and the gas air outlets (7) are located behind the ammonia gas air outlets (6); the guide vane (5) is an annular structure, the middle part thereof is coaxially fixed to the gas pipeline (4), the outer surface of the guide vane (5) is fixed to the inner surface of the combustor shell (1), and the guide vane (5) is located behind the air outlet of the gas pipeline (4); a plurality of straight air holes (8) for providing air to the gas at the air outlet of the gas pipeline (4) and the gas at the air outlet of the ammonia gas pipeline (3) are spaced apart along the circumferential direction of the inner side of the guide vane (5); a plurality of spiral air grooves (9) extending from the outer surface of the guide vane (5) to the inner side of the guide vane (5) for wrapping the gas at the air outlet of the gas pipeline (4) and the gas at the air outlet of the ammonia gas pipeline (3) to move to the outside of the front end of the combustor shell (1) are spaced apart along the circumferential direction of the outer side of the guide vane (5); and the front end of the combustor shell (1) is a chamfered structure.

2. The ammonia burner with an inner pre-chamber cage flame forming according to claim 1, characterized in that: The front end of the ammonia gas pipeline (3) and the front end of the gas pipeline (4) are both conical closed structures with small front ends and large rear ends.

3. The ammonia burner with an inner pre-chamber cage flame forming according to claim 1, characterized in that: The ammonia gas air outlets (6) and the gas air outlets (7) are both inclined cut holes inclined toward the front end of the combustor shell (1).

4. The internal pre-pot cage flame forming burner for ammonia as claimed in claim 1 wherein: The ratio of the air passage area of the straight air hole (8) to the air passage area of the spiral air groove (9) is 1:5-1:6.

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