An adjustable hydrogen-infused rotary kiln burner and its usage method

Abstract

This invention relates to the field of hydrogen rotary kiln burner technology, and more specifically, to an adjustable hydrogen-blended rotary kiln burner and its usage method. Through a control component located in the hydrogen duct, this invention can dynamically and precisely adjust the flow cross-sectional area of ​​the hydrogen duct. This allows the burner to ensure that the hydrogen flow rate is always higher than its flame propagation speed according to actual operating conditions, thereby fundamentally eliminating the safety hazard of hydrogen backfire and greatly improving the safety and reliability of equipment operation. This invention innovatively adopts a dual-fuel co-combustion mode of hydrogen and pulverized coal. By adjusting the cross-section of the hydrogen duct and the air distribution in each duct, the blending ratio of hydrogen and pulverized coal can be continuously and flexibly adjusted. This not only enhances the burner's adaptability to multiple fuels, but more importantly, it maximizes the hydrogen substitution ratio according to demand, thereby significantly reducing carbon dioxide emissions and enabling the burner to have dynamic adjustment capabilities.

Description

Technical Field

[0001] This invention relates to the field of hydrogen rotary kiln burner technology, and more specifically, to an adjustable hydrogen-blended rotary kiln burner and its usage method. Background Technology

[0002] Rotary kilns are widely used in industries such as cement, metallurgy, and chemicals. Their core function is to achieve calcination or chemical reaction of materials through high-temperature combustion.

[0003] Currently, conventional burners primarily rely on fossil fuels such as pulverized coal and natural gas. The large amounts of carbon dioxide emissions from the combustion of these fuels have become a pressing environmental problem. Hydrogen, as an ideal zero-carbon fuel, produces only water as a combustion product, which can significantly reduce carbon dioxide emissions.

[0004] In industries such as steel and cement, hydrogen energy has become an important technological path for replacing fossil fuels. However, the application of hydrogen energy still faces significant technical challenges: on the one hand, the extremely fast propagation speed of hydrogen flames makes it highly susceptible to backfire within the burner, posing a serious safety hazard. On the other hand, existing burner structures are relatively fixed, making it difficult to flexibly adjust the mixing ratio of hydrogen and traditional fuels, severely restricting the feasibility of hydrogen energy substitution.

[0005] The currently predominantly used four-channel rotary kiln burners (including a coal-air channel, a central air channel, a swirl air channel, and an axial air channel) have significant shortcomings in hydrogen fuel adaptability. Their fixed nozzle design and lack of adjustable structures prevent the burner from dynamically adjusting the outlet cross-sectional area according to the hydrogen flow rate to suppress backfire, and they lack the ability to adapt to changes in operating conditions. These technical bottlenecks urgently necessitate the development of dynamically adjustable hydrogen burner systems to meet the pressing needs of industrial decarbonization. Summary of the Invention

[0006] The purpose of this invention is to provide an adjustable hydrogen-infused rotary kiln burner to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an adjustable hydrogen-doped rotary kiln burner, comprising interconnected tube assemblies, wherein the tube assemblies, from the outside to the inside, are as follows:

[0008] The main hydrogen air supply pipe, together with its inner pipes, forms the hydrogen air duct.

[0009] The axial flow air splicing pipe, together with the inner pipe, forms an axial flow air duct;

[0010] The coal ventilation pipe, together with its inner pipe, forms the coal ventilation duct;

[0011] The swirl air splicing pipe, together with its inner pipe, forms a swirl air duct;

[0012] The central air duct has a central air channel inside, and an igniter is installed inside the central air channel.

[0013] Among them, a control component for adjusting the flow cross-sectional area of ​​the hydrogen air duct outlet throat is installed between the main hydrogen air duct and the axial flow air splicing pipe.

[0014] A further technical solution of this application: one end of the axial flow splicing pipe is connected to a primary air duct, which is used to introduce primary air into the axial flow duct.

[0015] A further technical solution of this application: one end of a primary vortex connecting pipe is connected to the outer side of the other end of the primary air duct, and the other end of the primary vortex connecting pipe is connected to the vortex air splicing pipe. The primary vortex connecting pipe is used to introduce primary air into the vortex air duct.

[0016] A further technical solution of this application: a coal air supply pipe and a hydrogen air auxiliary pipe are respectively provided on the outer side of the coal air splicing pipe and the axial flow air splicing pipe.

[0017] A further technical solution of this application: The control component specifically includes a shielding component, an adjusting component and a driving component. The shielding component includes a mounting ring groove and an adjusting ring. The mounting ring groove is provided at the same cross section of the hydrogen air main pipe and the axial flow air splicing pipe. There are two adjusting rings, and the two adjusting rings are mirror images of each other. The two adjusting rings together constitute the adjustable throat of the hydrogen air duct.

[0018] The number of adjusting components is several, and they are evenly distributed between the two adjusting rings;

[0019] The driving component is located on the outer ring surface of the hydrogen air main pipe, and the driving component drives several adjusting components to move synchronously, thereby adjusting the contraction of the two adjusting rings to change the cross-sectional area of ​​the adjustable throat.

[0020] A further technical solution of this application: a single adjusting component specifically includes a drive screw, a screw sleeve and a shielding ring. The shielding ring is installed on the inner ring surface of the axial flow splicing pipe. The drive screw is inserted between two adjusting rings. The outer side of the drive screw is provided with two threads of opposite direction and the same length, and the outer sides of the two threads are respectively connected to two screw sleeves.

[0021] Two screw sleeves are installed inside the two adjusting rings respectively, and the end faces of the two screw sleeves that are far apart from each other are provided with actuating shims;

[0022] One end of the drive screw extends to the outer ring surface of the shielding ring, and the outer ring surface of the shielding ring is also provided with a shielding groove, and a limiting bearing connected to one end of the drive screw is provided inside the shielding groove.

[0023] The top of the drive screw is also provided with a follower tooth, and the follower tooth is connected to the drive component.

[0024] A further technical solution of this application: The driving component specifically includes a mounting ring frame and a driving motor installed on the outer ring surface of the hydrogen gas main pipe. A driving internal gear ring is coaxially installed on the inner ring surface of the mounting ring frame, and the inner ring surface of the driving internal gear ring is connected to several adjusting components.

[0025] The power output shaft of the drive motor extends into the mounting ring frame and is equipped with a drive gear; the upper ring surface of the drive internal gear ring is provided with a first driven tooth, and the drive gear meshes with the first driven tooth.

[0026] A further technical solution of this application: a cyclone separator is also installed inside the cyclone duct.

[0027] A further technical solution of this application: a primary central connecting pipe is also connected between the primary air duct and the central air duct.

[0028] A method of using an adjustable hydrogen-infused rotary kiln burner, the method comprising the following steps:

[0029] Step 1: Direct air is introduced into the central air duct through the central air duct, coal powder and a small amount of oxygen are injected through the coal air duct, hydrogen is introduced through the hydrogen air duct, and primary air is introduced through the primary air duct at the same time. The primary air enters the vortex air duct and passes through the vortex generator to change the direction and axis of the primary air.

[0030] Step 2: Ignite the mixture using an igniter to achieve the dual-fuel combustion of hydrogen and pulverized coal;

[0031] Step 3: During combustion, the flow cross-sectional area of ​​the hydrogen duct outlet throat is controlled by the control component. By changing the throat area, the outlet jet velocity of hydrogen is adjusted to ensure that the hydrogen flow velocity is always higher than the flame propagation velocity, preventing hydrogen backflow, and at the same time, the mixing ratio of hydrogen and pulverized coal is continuously adjusted.

[0032] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0033] 1. This invention, through a control component installed in the hydrogen duct, can dynamically and precisely adjust the flow cross-sectional area of ​​the hydrogen duct. This allows the burner to ensure that the hydrogen flow rate is always higher than its flame propagation speed according to actual operating conditions, thereby fundamentally eliminating the safety hazard of hydrogen backfire and greatly improving the safety and reliability of equipment operation. This invention innovatively adopts a dual-fuel co-combustion mode of hydrogen and pulverized coal. By adjusting the cross-section of the hydrogen duct and the air distribution in each duct, the mixing ratio of hydrogen and pulverized coal can be continuously and flexibly adjusted. This not only enhances the burner's adaptability to multiple fuels, but more importantly, it maximizes the hydrogen substitution ratio according to demand, thereby significantly reducing carbon dioxide emissions. Furthermore, it gives the burner dynamic adjustment capabilities, enabling it to quickly respond to load changes and fuel characteristic fluctuations, always maintaining optimal combustion conditions. This strong adaptability not only improves production efficiency, but its ability to maintain stable combustion through adjustment also helps reduce the impact of combustion fluctuations on the kiln lining, while providing good protection for the burner head components, thus extending the service life of the entire system.

[0034] 2. This invention, by placing the hydrogen air duct on the outermost layer and combining it with the coordinated operation of the central airflow, swirling airflow, and axial airflow, can precisely organize the combustion process and shape an ideal flame shape and rigidity. The addition of hydrogen helps stabilize the pulverized coal flame and improve combustion efficiency, while the combination of swirling and axial airflow ensures complete combustion of the fuel, achieving a simultaneous improvement in combustion stability and efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0037] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A;

[0038] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B.

[0039] The labels in the schematic diagram are as follows: 1. Hydrogen main pipe; 2. Control components; 201. Drive motor; 202. Drive gear; 203. First driven gear; 204. Drive internal gear ring; 205. Shielding ring; 206. Limit bearing; 207. Screw sleeve; 208. Adjusting ring; 209. Mounting ring frame; 210. Follower gear; 211. Drive screw; 212. Actuating shim; 3. Hydrogen secondary pipe; 4. Axial flow air splicing pipe; 5. Coal air splicing pipe; 6. Coal air inlet pipe; 7. Swirl air splicing pipe; 8. Central air duct; 9. Primary swirl connecting pipe; 10. Primary central connecting pipe; 11. Primary air duct; 12. Ignition device; 13. Hydrogen duct; 14. Coal air duct; 15. Central air duct; 16. Axial flow duct; 17. Swirl air duct; 18. Swirl generator. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention will be further described below with reference to the embodiments.

[0041] Please see Figures 1 to 4 In one embodiment of this application, an adjustable hydrogen-doped rotary kiln burner includes interconnected tube assemblies, wherein the tube assemblies, from the outside to the inside, are as follows:

[0042] Hydrogen air main pipe 1, together with its inner pipe, forms hydrogen air duct 13;

[0043] Axial flow air splicing pipe 4, together with its inner pipe, forms axial flow air duct 16;

[0044] The coal ventilation pipe 5, together with its inner pipe, forms the coal ventilation duct 14;

[0045] The swirl air splicing pipe 7, together with its inner pipe, forms a swirl air duct 17;

[0046] The central air duct 8 has a central air channel 15 inside, and an igniter 12 is installed inside the central air channel 15.

[0047] Among them, a control component 2 for adjusting the flow cross-sectional area of ​​the outlet throat of the hydrogen air duct 13 is provided between the hydrogen air main pipe 1 and the axial flow air splicing pipe 4.

[0048] Furthermore, one end of a primary air duct 11 is connected to the outside of the axial flow splicing pipe 4. The primary air duct 11 is used to introduce primary air into the axial flow duct 16.

[0049] Furthermore, one end of a primary vortex connecting pipe 9 is connected to the outer side of the other end of the primary air duct 11. The other end of the primary vortex connecting pipe 9 is connected to the vortex air splicing pipe 7. The primary vortex connecting pipe 9 is used to introduce primary air into the vortex air duct 17.

[0050] Furthermore, a coal air supply pipe 6 and a hydrogen air auxiliary pipe 3 are respectively installed on the outer side of the coal air splicing pipe 5 and the axial flow air splicing pipe 4.

[0051] Furthermore, a cyclone separator 18 is also installed inside the cyclone duct 17.

[0052] Furthermore, a primary central connecting pipe 10 connects the primary air duct 11 and the central air duct 8.

[0053] This embodiment is implemented as follows: In actual use, direct air is introduced into the central air duct 15 through the central air duct 8, coal powder and a small amount of oxygen are injected through the coal air duct 14, hydrogen is introduced through the hydrogen air duct 13, and primary air is introduced through the primary air duct 11, entering the swirl air duct 17. After passing through the swirl generator 18, the direction and axis of the primary air are changed. Ignition is carried out by the igniter 12 to achieve the mixed combustion of hydrogen and coal powder. During the combustion process, the flow cross-sectional area of ​​the hydrogen air duct 13 is controlled by the control component 2 to ensure that the hydrogen flow rate is always higher than the flame propagation speed, prevent hydrogen backflow, and continuously adjust the mixing ratio of hydrogen and coal powder.

[0054] By using the control component 2 located in the hydrogen duct 13, the flow cross-sectional area of ​​the hydrogen duct 13 can be dynamically and precisely adjusted. This allows the burner to ensure that the hydrogen flow rate is always higher than its flame propagation speed according to actual operating conditions, thereby fundamentally eliminating the safety hazard of hydrogen backfire and greatly improving the safety and reliability of equipment operation. This invention innovatively adopts a dual-fuel co-combustion mode of hydrogen and pulverized coal. By adjusting the cross-section of the hydrogen duct 13 and the air distribution in each duct, the mixing ratio of hydrogen and pulverized coal can be continuously and flexibly adjusted. This not only enhances the burner's adaptability to multiple fuels, but more importantly, it maximizes the hydrogen substitution ratio according to demand, thereby significantly reducing carbon dioxide emissions and giving the burner dynamic adjustment capabilities.

[0055] Please see Figures 1 to 4 As a preferred embodiment of this application, the control component 2 specifically includes a shielding component, an adjusting component, and a driving component. The shielding component includes a mounting ring groove and an adjusting ring 208. The mounting ring groove is provided at the same cross section of the hydrogen air main pipe 1 and the axial flow splicing pipe 4. There are two adjusting rings 208, and the two adjusting rings 208 are mirror images of each other. The two adjusting rings 208 together constitute the adjustable throat of the hydrogen air duct 13.

[0056] The number of adjusting components is several, and they are evenly distributed between the two adjusting rings 208;

[0057] The driving component is located on the outer ring surface of the hydrogen air main pipe 1, and the driving component drives several adjusting components to move synchronously, thereby adjusting the contraction of the two adjusting rings 208 to change the cross-sectional area of ​​the adjustable throat.

[0058] Furthermore, each adjustment component specifically includes a drive screw 211, a screw sleeve 207, and a shielding ring 205. The shielding ring 205 is installed on the inner ring surface of the axial flow splicing pipe 4. The drive screw 211 is inserted between two adjustment rings 208. The drive screw 211 has two threads of opposite directions and the same length on its outer side, and two screw sleeves 207 are respectively connected to the outer side of the two threads.

[0059] Two screw sleeves 207 are respectively installed inside two adjusting rings 208, and each of the two screw sleeves 207 has a shim 212 on its far-away end face;

[0060] One end of the drive screw 211 extends to the outer ring surface of the shielding ring 205. The outer ring surface of the shielding ring 205 is also provided with a shielding groove, and a limit bearing 206 connected to one end of the drive screw 211 is provided inside the shielding groove.

[0061] The top end of the drive screw 211 is also provided with a follower tooth 210, and the follower tooth 210 is connected to the drive component.

[0062] This embodiment is implemented as follows: In actual use, the main function of the control component 2 is to adjust the cross-sectional area of ​​the hydrogen air duct 13. The specific adjustment is achieved by using a shielding component in conjunction with an adjusting component. The shielding component consists of two adjusting rings 208, and the two adjusting rings 208 are respectively located in the same cross-sectional opening of the hydrogen air main pipe 1 and the axial flow air splicing pipe 4. The adjusting rings 208 can be made of a material with deformation capability. When no adjustment is made, the gap between the two adjusting rings 208 is the opening size of the hydrogen air inlet. When the hydrogen air inlet flow rate remains constant, the larger the opening, the slower the flow rate, and vice versa. The smaller the opening, the faster the final flow rate of the hydrogen air, which can effectively prevent backflow.

[0063] The contraction and adjustment of the two adjusting rings 208 is controlled by an adjusting component, which mainly consists of a drive screw 211 and a screw sleeve 207. The drive screw 211 has two symmetrically arranged threads of the same length but opposite directions on its outer side. The rotation of the drive screw 211 causes the screw sleeve 207 to rotate accordingly. Since the screw sleeve 207 is fixedly installed inside the adjusting ring 208, it will not rotate with the drive screw 211 but will rotate on the outside of the drive screw 211 according to the direction of the mating threads, thus achieving opposite displacement of the two screw sleeves 207, bringing them closer together or away from each other. During the process of bringing them closer together, each screw sleeve 207 will drive its connected actuating washer 212 to abut against the adjusting ring 208, thereby deforming the adjusting ring 208. The deformation of the adjusting ring 208 brings them closer together, controlling the cross-sectional size, and thus controlling the hydrogen flow rate.

[0064] The rotation of the drive screw 211 is achieved by the drive component driving the follower gear 210 to rotate.

[0065] Another point is that the reason for setting up several adjustment components is that the adjustment ring 208 is annular. If only one or two are set up, the deformation of the adjustment component will cause irregular cross-sectional openings, resulting in uneven hydrogen air flow and poor mixing effect. To achieve uniform deformation, the driving component is needed to make multiple adjustment components move synchronously.

[0066] Please see Figures 1 to 4 As a preferred embodiment of this application, the driving component specifically includes a mounting ring 209 and a driving motor 201 mounted on the outer ring surface of the hydrogen air main pipe 1. A driving internal gear ring 204 is coaxially mounted on the inner ring surface of the mounting ring 209, and the inner ring surface of the driving internal gear ring 204 is connected to several adjusting components.

[0067] The power output shaft of the drive motor 201 extends into the mounting ring 209 and is equipped with a drive gear 202; the upper ring surface of the drive internal gear ring 204 is provided with a first driven tooth 203, and the drive gear 202 meshes with the first driven tooth 203.

[0068] This embodiment is implemented as follows: by setting and installing a ring frame 209 on the outer ring surface of the hydrogen air main pipe 1, during adjustment, the drive motor 201 set on the side of the ring frame 209 drives the drive gear 202 to rotate. The drive gear 202 is connected to the first driven tooth 203 on the upper end face of the drive internal gear ring 204, which drives the drive internal gear ring 204 to rotate. When the drive internal gear ring 204 rotates, the first driven tooth 203 rotates.

[0069] Please see Figure 1 - Figure 4 The present invention discloses a method for using an adjustable hydrogen-infused rotary kiln burner, the method comprising the following steps:

[0070] Step 1: Direct air is introduced into the central air duct 15 through the central air duct 8, coal powder and a small amount of oxygen are injected through the coal air duct 14, hydrogen is introduced through the hydrogen air duct 13, and primary air is introduced through the primary air duct 11. The primary air enters the cyclone air duct 17 and passes through the cyclone separator 18, which changes the direction and axis of the primary air.

[0071] Step 2: Ignition is performed using igniter 12 to achieve the mixed combustion of hydrogen and pulverized coal.

[0072] Step 3: During combustion, the flow cross-sectional area of ​​the outlet throat of the hydrogen duct 13 is controlled by the control component 2. By changing the throat area, the outlet jet velocity of hydrogen is adjusted to ensure that the hydrogen flow velocity is always higher than the flame propagation velocity, preventing hydrogen backflow, and at the same time, the mixing ratio of hydrogen and pulverized coal is continuously adjusted.

[0073] In summary, this invention, through a control component located in the hydrogen duct, can dynamically and precisely adjust the flow cross-sectional area of ​​the hydrogen duct. This allows the burner to ensure that the hydrogen flow rate is always higher than its flame propagation speed according to actual operating conditions, thereby fundamentally eliminating the safety hazard of hydrogen backfire and greatly improving the safety and reliability of equipment operation. This invention innovatively adopts a dual-fuel co-combustion mode of hydrogen and pulverized coal. By adjusting the cross-section of the hydrogen duct and the air distribution in each duct, the mixing ratio of hydrogen and pulverized coal can be continuously and flexibly adjusted. This not only enhances the burner's adaptability to multiple fuels, but more importantly, it maximizes the hydrogen substitution ratio according to demand, thereby significantly reducing carbon dioxide emissions. Furthermore, it gives the burner dynamic adjustment capabilities, enabling it to quickly respond to load changes and fuel characteristic fluctuations, always maintaining optimal combustion conditions. This strong adaptability not only improves production efficiency, but its ability to maintain stable combustion through adjustment also helps reduce the impact of combustion fluctuations on the kiln lining, while providing good protection for the burner head components, thus extending the service life of the entire system.

[0074] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

[0075] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An adjustable hydrogen-doped rotary kiln burner, comprising interconnected tube assemblies, characterized in that: The tubular components, from the outside to the inside, are as follows: The hydrogen air main pipe (1) and its inner pipe form a hydrogen air duct (13). Axial flow air splicing pipe (4) forms an axial flow air duct (16) with its inner pipe. The coal ventilation pipe (5) and its inner pipe form a coal ventilation duct (14). The swirl air splicing pipe (7) and its inner pipe form a swirl air duct (17). The central air duct (8) has a central air channel (15) inside, and an igniter (12) is installed inside the central air channel (15). Among them, a control component (2) for adjusting the flow cross-sectional area of ​​the outlet throat of the hydrogen air duct (13) is provided between the hydrogen air main pipe (1) and the axial flow air splicing pipe (4). The control component (2) specifically includes a shield, an adjustment component and a drive component. The shield includes a mounting ring groove and an adjustment ring (208). The same section of the hydrogen air main pipe (1) and the axial flow splicing pipe (4) is provided with a mounting ring groove. There are two adjustment rings (208), and the two adjustment rings (208) are mirror images of each other. The two adjustment rings (208) together constitute the adjustable throat of the hydrogen air duct (13). The number of adjusting components is several, and they are evenly distributed between the two adjusting rings (208); The driving component is located on the outer ring surface of the hydrogen air main pipe (1), and the driving component drives several adjusting components to move synchronously to adjust the contraction of the two adjusting rings (208) to change the cross-sectional area of ​​the adjustable throat. The individual adjusting component specifically includes a drive screw (211), a screw sleeve (207), and a shielding ring (205). The shielding ring (205) is installed on the inner ring surface of the axial flow splicing pipe (4). The drive screw (211) is inserted between two adjusting rings (208). The drive screw (211) has two threads of opposite directions and the same length on its outer side, and two screw sleeves (207) are respectively connected to the outer side of the two threads. Two screw sleeves (207) are respectively installed inside two adjusting rings (208), and each of the two screw sleeves (207) has a shim (212) on its far-away end face. One end of the drive screw (211) extends to the outer ring surface of the shielding ring (205). The outer ring surface of the shielding ring (205) is also provided with a shielding groove, and a limit bearing (206) connected to one end of the drive screw (211) is provided inside the shielding groove. The top end of the drive screw (211) is also provided with a follower tooth (210), and the follower tooth (210) is connected to the drive component.

2. The adjustable hydrogen-doped rotary kiln burner according to claim 1, characterized in that, The outer side of the axial flow splicing pipe (4) is connected to one end of the primary air duct (11), which is used to introduce primary air into the axial flow duct (16).

3. An adjustable hydrogen-doped rotary kiln burner according to claim 2, characterized in that, One end of the primary air duct (11) is connected to one end of the primary vortex connecting pipe (9), and the other end of the primary vortex connecting pipe (9) is connected to the vortex air splicing pipe (7). The primary vortex connecting pipe (9) is used to introduce primary air into the vortex air duct (17).

4. The adjustable hydrogen-doped rotary kiln burner according to claim 1, characterized in that, The coal-air splicing pipe (5) and the axial flow air splicing pipe (4) are respectively provided with a coal-air inlet pipe (6) and a hydrogen air auxiliary pipe (3).

5. An adjustable hydrogen-doped rotary kiln burner according to claim 1, characterized in that, The driving components specifically include a mounting ring frame (209) installed on the outer ring surface of the hydrogen air main pipe (1) and a drive motor (201). The inner ring surface of the mounting ring frame (209) is coaxially mounted with a drive internal gear ring (204), and the inner ring surface of the drive internal gear ring (204) is connected to several adjusting components. The power output shaft of the drive motor (201) extends into the mounting ring frame (209) and is equipped with a drive gear (202); the upper ring surface of the drive internal gear ring (204) is provided with a first driven tooth (203), and the drive gear (202) meshes with the first driven tooth (203).

6. An adjustable hydrogen-doped rotary kiln burner according to claim 1, characterized in that, The swirling air duct (17) is also equipped with a swirling device (18).

7. An adjustable hydrogen-doped rotary kiln burner according to claim 1, characterized in that, A primary central connecting pipe (10) is also connected between the primary air duct (11) and the central air duct (8).

8. A method of using an adjustable hydrogen-infused rotary kiln burner, characterized in that, The adjustable hydrogen-doped rotary kiln burner according to any one of claims 1-7 is characterized in that the method of use includes the following steps: Step 1: Direct air is introduced into the central air duct (15) through the central air duct (8), coal powder and a small amount of oxygen are injected through the coal air duct (14), hydrogen is introduced through the hydrogen air duct (13), and primary air is introduced through the primary air duct (11) and enters the vortex air duct (17). After passing through the vortex generator (18), the direction and axis of the primary air blown in change. Step 2: Ignition is performed using igniter (12) to achieve the mixed combustion of hydrogen and pulverized coal. Step 3: During the combustion process, the flow cross-sectional area of ​​the outlet throat of the hydrogen duct (13) is controlled by the control component (2). By changing the throat area, the outlet jet velocity of hydrogen is adjusted to ensure that the hydrogen flow velocity is always higher than the flame propagation velocity, prevent hydrogen backflow, and at the same time realize the continuous adjustment of the mixing ratio of hydrogen and coal powder.

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