Pure ammonia burner and combustion device

Abstract

The present invention discloses a pure ammonia burner and combustion device. The outer circumference of an ammonia pipe is provided with an ammonia hole. The front end of the ammonia pipe passes through the mixing chamber of a mixing sleeve and is rotatably connected to an impeller assembly. The outer circumference of the mixing chamber is provided with a first hole. The impeller assembly includes a first impeller and a second impeller. The first impeller is located behind the second impeller. The outer end of the first flow channel of the first impeller is a first inlet connected to the first hole, and the inner end is a first outlet. The outer end of the second flow channel of the second impeller is a second outlet connected to the mixing chamber, and the inner end is a second inlet connected to the first outlet. The second impeller is provided with a second hole connected to the ammonia hole and the second flow channel. The rear end of the mixing sleeve passes through the first air chamber of the primary air sleeve. The first hole is connected to the first air chamber. The front end of the second air chamber of the secondary air sleeve is provided with a wind disk connected to the front end of the mixing sleeve. The wind disk is provided with a swirl groove connected to the second air chamber and a spray hole connected to the mixing chamber. The present invention can make ammonia and primary air mix more evenly.

Description

Technical Field

[0001] The invention belongs to the technical field of burners, and in particular relates to a pure ammonia burner and a combustion device. Background Art

[0002] Due to the significant global greenhouse effect, the world is paying close attention to carbon dioxide emissions and implementing measures to effectively reduce greenhouse gas emissions, such as promoting new energy vehicles and adopting renewable energy fuels. In the field of burner technology, ammonia, a promising alternative to traditional fossil fuels, is being used to avoid the large amounts of carbon dioxide produced during combustion. However, ammonia combustion suffers from drawbacks such as high ignition energy, slow flame propagation, and poor flame stability, making it difficult to maintain stable combustion in industrial burners.

[0003] To address the aforementioned issues, existing ammonia burners premix ammonia with primary combustion air. Specifically, the primary combustion air and ammonia are introduced directly into the ammonia burner's mixing chamber, where they contact and mix before flowing out of the burner's nozzle and igniting. However, in actual use, these burners suffer from insufficient mixing uniformity between the ammonia and primary combustion air, resulting in a poor ignition success rate. Therefore, further improvements to the existing ammonia burner structure are needed. Summary of the Invention

[0004] The present invention aims to provide a pure ammonia burner with a unique design, which can promote a more uniform mixing of ammonia and primary air to complete the premixing work, thereby helping to improve the ignition efficiency and combustion stability of ammonia.

[0005] In addition, the present invention also provides a combustion device including the above-mentioned pure ammonia burner.

[0006] The technical solutions adopted to solve the above technical problems are:

[0007] In a first aspect, the present invention provides a pure ammonia burner comprising:

[0008] an ammonia pipe extending forward and backward and having ammonia holes formed on its outer wall;

[0009] a mixing sleeve extending forward and backward and having a mixing chamber, wherein a first air hole is provided on an outer peripheral wall of the mixing chamber, and a front end of the ammonia pipe passes through the mixing chamber;

[0010] an impeller assembly rotatably connected to the front end of the ammonia pipe, the impeller assembly comprising a first impeller and a second impeller coaxially connected, the first impeller being located on the rear side of the second impeller, the first impeller having a first flow channel, the outer end of the first flow channel being a first inlet connected to the first air hole, the inner end of the first flow channel being a first outlet, the second impeller having a second flow channel, the outer end of the second flow channel being a second outlet connected to the mixing chamber, the inner end of the second flow channel being a second inlet connected to the first outlet, the second impeller being provided with a second air hole connected to the ammonia air hole, the second air hole being connected to the second flow channel;

[0011] a primary air sleeve having a first air cavity, wherein the rear end of the mixing sleeve passes through the first air cavity, and the first air hole is in communication with the first air cavity;

[0012] The secondary air sleeve has a second air cavity running through the front and back, and a wind disk is provided at the front end of the second air cavity. The wind disk is connected to the front end of the mixing sleeve, and the wind disk is provided with a swirl groove connected to the second air cavity and a spray hole connected to the mixing cavity.

[0013] The pure ammonia burner provided by the present invention has at least the following beneficial effects: an impeller assembly is provided at the front end of the ammonia pipe, and the impeller assembly is located in the mixing chamber of the mixing sleeve. Primary air flows from the first air sleeve through the first air hole of the mixing sleeve into the first flow channel of the first impeller. The kinetic energy of the primary air is used to drive the first impeller to rotate around the ammonia pipe. At this time, the second impeller also rotates around the ammonia pipe under the driving action of the first impeller. During the rotation of the second impeller, a negative pressure is formed at the second inlet of the second flow channel. Under the action of the negative pressure, ammonia in the ammonia pipe flows into the second flow channel through the ammonia hole and the second air hole. At the same time, the primary air in the first flow channel also flows into the second flow channel. In the flow channel, the primary air and ammonia are mixed and thrown out under the rotation of the second impeller, thereby strengthening the mixing of the primary air and ammonia, and then improving the mixing uniformity of ammonia and primary air, which helps to improve the ignition success rate and make the ammonia burn more stably; the mixed gas in the mixing chamber flows out through the nozzle of the wind disk, and after ignition, the ammonia can burn rapidly to form a rich premixed flame. Moreover, the secondary air in the secondary air sleeve flows out through the swirl groove, forming a rotating airflow on the periphery of the rich premixed flame, generating a stirring effect, promoting the secondary mixing of the secondary air and unburned ammonia, so that the ammonia is fully burned, and improving the utilization rate of ammonia and flame stability.

[0014] As a further improvement to the above technical solution, the outer peripheral wall of the first impeller contacts the inner peripheral wall of the mixing chamber. This arrangement reduces the distance between the first inlet of the first impeller and the first air hole of the mixing chamber, thereby reducing the amount of primary air leaking through this distance. This allows the primary air flowing out of the first air hole to flow entirely into the first flow channel, fully utilizing the kinetic energy of the primary air and enabling the first impeller to rotate rapidly.

[0015] As a further improvement to the above technical solution, the air inlet direction of the first air hole is tangential to the inner circumferential wall of the mixing chamber. This configuration enables the primary air flowing out of the first air hole to exert a sufficiently strong force on the first impeller, thereby accelerating the rotation speed of the first impeller, allowing ammonia in the ammonia pipe to continuously flow into the second impeller and mix with the primary air.

[0016] As a further improvement to the above technical solution, the second air holes and the ammonia holes are inclined from back to front toward the second flow channel. This arrangement allows the direction in which ammonia flows into the second flow channel to form an acute angle with the direction in which the primary air flows into the second flow channel, allowing the ammonia and primary air to be fully mixed.

[0017] As a further improvement to the above technical solution, multiple first air holes, second air holes, and ammonia air holes are provided and arranged circumferentially. This arrangement increases the area through which primary air and ammonia flow into the impeller assembly. During the rotation of the impeller assembly, ammonia and primary air can continuously flow into the impeller assembly, allowing them to continuously mix and flow into the mixing chamber.

[0018] As a further improvement to the above technical solution, a nozzle is provided at the front end of the wind disc, and the nozzle is provided with a third air cavity. The third air cavity extends through the rear side of the wind disc and communicates with the mixing chamber. The nozzle is provided with multiple radially extending nozzle holes, which communicate with the third air cavity and are arranged in a circular pattern around the nozzle. This arrangement allows the mixed gas in the mixing chamber to be ejected from the nozzle holes, resulting in rapid combustion after ignition. The nozzle arrangement also stabilizes the flame.

[0019] As a further improvement to the above technical solution, the air disc is provided with a first through-hole communicating with the mixing chamber. Multiple first through-holes are provided and arranged circumferentially around the nozzle. This arrangement allows a portion of the mixed gas in the mixing chamber to flow forward through the first through-holes, pushing the mixed gas at the nozzle orifice forward, accelerating the forward flow of the mixed gas and helping to increase the flame length.

[0020] As a further improvement of the above technical solution, the wind disc is provided with a second through hole connected to the second air cavity, and the second through holes are provided in plurality and arranged in a circle around the nozzle, and the second through holes are located between the swirl groove and the first through hole.

[0021] Such a setting can increase the area of ​​secondary air outflow, provide more combustion-supporting air for the mixture, and the secondary air flowing out from the second through hole can push the mixture forward, further increase the flow speed of the mixture, shorten the residence time of the mixture at the nozzle, reduce the combustion ratio of ammonia at the nozzle, and allow some unburned ammonia to reduce the nitrogen oxides produced by ammonia combustion during the forward flow process, thereby achieving the effect of zero nitrogen oxide emissions.

[0022] In a second aspect, the present invention also provides a combustion device, which includes a burner sleeve and a pure ammonia burner as described in any of the above technical solutions, wherein the burner sleeve extends forward and backward and has an inner cavity running through the front and back, and the pure ammonia burner is arranged in the inner cavity and is located at the rear end of the burner sleeve.

[0023] The combustion device provided by the present invention has at least the following beneficial effects: the pure ammonia burner is arranged in the inner cavity of the burner sleeve, and the burner sleeve is fixed to the kiln. When the combustion device is used, since a rotatable impeller assembly is arranged on the ammonia pipe, the kinetic energy of the primary air is used to drive the impeller assembly to rotate, so that the ammonia continuously flows into the second flow channel of the second impeller under the action of negative pressure, and the primary air in the first flow channel also flows into the second flow channel. The rotation of the second impeller forces the primary air and ammonia in the second flow channel to be mixed, thereby improving the mixing uniformity of ammonia and primary air, thereby increasing the ignition success rate and making the ammonia combustion more stable.

[0024] As a further improvement to the above technical solution, the outer peripheral wall of the secondary air sleeve is provided with third air holes that communicate with the second air cavity. Multiple third air holes are provided and arranged in a circle around the central axis of the second air cavity. Since the burner sleeve is mounted on the side wall of the kiln, the provision of the third air holes allows the secondary air flowing out of the third air holes to cool the burner sleeve, reducing the burner sleeve wall temperature and preventing excessive temperatures from shortening the burner sleeve's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 This is a schematic structural diagram of a pure ammonia burner provided in an embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of a combustion device provided in an embodiment of the present invention.

[0028] The markings in the accompanying drawings are as follows: 100, burner sleeve; 101, inner cavity; 110, small-diameter straight cylinder; 120, conical cylinder; 130, large-diameter straight cylinder; 200, pure ammonia burner; 210, secondary air sleeve; 211, second air cavity; 212, third air hole; 220, primary air sleeve; 221, first air cavity; 230, ammonia pipe; 231, ammonia cavity; 240, mixing sleeve; 241, mixing cavity; 242, first air hole; 250, wind disc; 251, swirl groove; 252, second through hole; 253, first through hole; 260, nozzle; 261, spray hole; 270, impeller assembly; 271, first flow channel; 272, second flow channel; 273, second air hole. DETAILED DESCRIPTION

[0029] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of the present invention, if words such as "several" are used, they mean one or more; "more" means two or more; "greater than," "less than," and "exceed" are understood to exclude the number itself; and "above," "below," and "within" are understood to include the number itself. The terms "first," "second," and "third" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number of the indicated technical features, or as implicitly specifying the order of the indicated technical features.

[0032] It should be noted that, in the drawings, the X direction is from the rear side to the front side of the pure ammonia burner; and the Z direction is from the bottom side to the top side of the pure ammonia burner.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] Reference Figures 1 to 2 , several embodiments of the pure ammonia burner and combustion device of the present invention are given below.

[0035] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a pure ammonia burner 200. The burner 200 includes an ammonia pipe 230, a mixing sleeve 240, an impeller assembly 270, a primary air sleeve 220, a secondary air sleeve 210, and an air disc 250. The unique design of the pure ammonia burner 200 promotes more uniform mixing of ammonia and primary air to achieve premixing, thereby improving ammonia ignition efficiency and combustion stability.

[0036] The ammonia pipe 230 has two ends extending in the front-to-back direction. The ammonia pipe 230 is a circular pipe with a hollow interior forming an ammonia cavity 231. The outer wall of the ammonia pipe 230 is provided with ammonia holes, which are connected to the ammonia cavity 231. The ammonia holes are circular holes, and the number of ammonia holes is not limited.

[0037] In this embodiment, the ammonia holes are located at the front end of the ammonia tube 230, and the ammonia cavity 231 extends through the rear side of the ammonia tube 230. That is, ammonia enters through the rear opening of the ammonia cavity 231 and flows out of the ammonia holes. There are multiple ammonia holes, which are arranged in a circle about the central axis of the ammonia tube 230.

[0038] The mixing sleeve 240 extends in the front-to-back direction at both ends. A mixing chamber 241 is formed hollow within the mixing sleeve 240. The mixing chamber 241 is cylindrical. First air holes 242 are provided on the outer wall of the mixing sleeve 240 and communicate with the mixing chamber 241. The number of first air holes 242 is not limited. The first air holes 242 can be circular or arc-shaped.

[0039] Mixing sleeve 240 is located in front of ammonia pipe 230. The front end of ammonia pipe 230 extends through mixing chamber 241. Specifically, a connection port is provided on the rear side of mixing sleeve 240 for the front end of ammonia pipe 230 to extend into. The outer wall of ammonia pipe 230 contacts the inner surface of the connection port. Mixing chamber 241 extends through the front side of mixing sleeve 240, meaning the front side of mixing sleeve 240 is open.

[0040] In this embodiment, the mixing sleeve 240 is a circular sleeve and is coaxially arranged with the ammonia pipe 230. The mixing sleeve 240 and the ammonia pipe 230 can be connected and fixed by welding, clamping, etc. A plurality of first air holes 242 are provided and arranged circumferentially around the central axis of the mixing sleeve 240.

[0041] The impeller assembly 270 is disposed at the front end of the ammonia pipe 230. The impeller assembly 270 is sleeved onto the ammonia pipe 230 and is coaxially disposed with the ammonia pipe 230, allowing the impeller assembly 270 to rotate relative to the ammonia pipe 230 about an axis extending forward and backward. The impeller assembly 270 is located within the mixing chamber 241 of the mixing sleeve 240.

[0042] It is understood that the impeller assembly 270 can be mounted on the ammonia pipe 230 via a bearing, allowing the impeller assembly 270 to easily rotate relative to the ammonia pipe 230. Alternatively, the impeller assembly 270 can be provided with a connecting shaft hole, through which the impeller assembly 270 is sleeved onto the ammonia pipe 230, with the connecting shaft hole being adapted to the ammonia pipe 230, thereby achieving rotatable connection of the impeller assembly 270 to the ammonia pipe 230. Furthermore, the contact surface between the inner circumferential wall of the connecting shaft hole and the outer circumferential wall of the ammonia pipe 230 is relatively smooth, resulting in low friction, allowing the impeller assembly 270 to easily rotate relative to the ammonia pipe 230. After the impeller assembly 270 is mounted on the ammonia pipe 230, the ammonia pipe 230 is inserted from the front to the back into the mixing chamber 241 of the mixing sleeve 240 and connected to the mixing sleeve 240.

[0043] Impeller assembly 270 comprises a first impeller and a second impeller. The first and second impellers are coaxially arranged and fixedly connected to each other, such as by welding or snap-fitting. The second impeller is located in front of the first impeller. In this embodiment, the first and second impellers are connected using an integrated molding process.

[0044] The first impeller has a first flow channel 271. Both the outer and inner ends of the first flow channel 271 are open. The side closer to the central axis of the first impeller is the inner side, and the side farther from the central axis is the outer side. Specifically, the outer end of the first flow channel 271 is the first inlet, which is connected to the first air hole 242. The inner end of the first flow channel 271 is the first outlet.

[0045] It can be understood that the first inlet and the first air hole 242 are arranged opposite to each other, and the outer diameter of the first impeller is adapted to the inner hole of the mixing chamber 241, so that the gap between the first air hole 242 and the first impeller can be designed to be small. Gas can flow into the first flow channel 271 from the first inlet and flow out from the first outlet. The first impeller has a plurality of first flow channels 271. During the rotation of the first impeller, each first flow channel 271 will be connected to all the first air holes 242 in turn, and each first air hole 242 will always be connected to one of the first flow channels 271. The gas flowing out of the first air hole 242 has a high speed and strong kinetic energy, which can drive the first impeller to rotate. The air intake direction of the first inlet is perpendicular to the rotation axis of the impeller assembly 270.

[0046] The second impeller has a second flow channel 272, both the outer and inner ends of which are open. The side closest to the central axis of the second impeller is the inner side, and the side farther from the central axis is the outer side. The outer end of the second flow channel 272 is a second outlet, which is connected to the mixing chamber 241. The inner end of the second flow channel 272 is a second inlet, which is connected to the first outlet. In this embodiment, the gas flowing out of the first outlet flows forward and flows into the second inlet.

[0047] The second impeller is provided with a second air hole 273. One end of the second air hole 273 is connected to the second flow channel 272, and the other end of the second air hole 273 is connected to the ammonia hole. The second air hole 273 is arranged opposite to the ammonia hole. The number of second air holes 273 is not limited.

[0048] In some embodiments, a plurality of second air holes 273 are provided and arranged circumferentially around the central axis of the second impeller. In other embodiments, the plurality of second air holes 273 can be designed independently or interconnected to form an annular hole structure.

[0049] It can be understood that the outer diameter of the second impeller is smaller than that of the first impeller. Therefore, there is a certain gap between the outer edge of the second impeller and the inner circumferential wall of the mixing chamber 241. The size of the gap can be set according to actual conditions and is not limited here. Moreover, in this way, the second outlet can be connected to the mixing chamber 241. The gas can flow into the second flow channel 272 from the second inlet and flow into the mixing chamber 241 from the second outlet. In addition, the gas can also flow into the second flow channel 272 through the second air hole 273. The gas in the first flow channel 271 can flow into the second flow channel 272. The outlet direction of the second outlet is perpendicular to the rotation axis of the impeller assembly 270. Of course, it is not ruled out that the outlet direction of the second outlet forms a certain acute angle with the rotation axis of the impeller assembly 270, so that the gas flowing out of the second outlet has a forward flow speed.

[0050] In this embodiment, since the plurality of second air holes 273 are connected and communicated with each other to form an annular hole structure, the second air holes 273 can always communicate with all the ammonia holes during the rotation of the second impeller, so that ammonia can flow into the second flow channel 272 through the ammonia holes and the second air holes 273 in sequence.

[0051] Both ends of the primary air sleeve 220 extend in the front-to-back direction. A first air cavity 221 is formed hollow inside the primary air sleeve 220. The first air cavity 221 runs through the rear side of the primary air sleeve 220. That is, the rear side of the primary air sleeve 220 has an opening structure, which facilitates the primary air (or primary combustion air) to flow into the first air cavity 221 from the back to the front.

[0052] The mixing sleeve 240 is located in front of the primary air sleeve 220. The rear end of the mixing sleeve 240 extends through the primary air sleeve 220, connecting the first air cavity 221 with the first air hole 242. Therefore, the primary air in the first air cavity 221 can flow into the first air hole 242. Specifically, a connecting opening is provided on the front side of the primary air sleeve 220. The rear end of the mixing sleeve 240 is inserted into the connecting opening, and the outer peripheral wall of the mixing sleeve 240 contacts the inner peripheral wall of the connecting opening. The mixing sleeve 240 and the primary air sleeve 220 can be connected and fixed by welding, clamping, or other methods.

[0053] In this embodiment, the primary air sleeve 220 is a cylindrical sleeve, the first air cavity 221 is a cylindrical cavity, and the primary air sleeve 220 and the mixing sleeve 240 are coaxially arranged.

[0054] Both ends of the secondary air sleeve 210 extend in the front-to-back direction. The interior of the secondary air sleeve 210 is hollow to form a second air cavity 211. The second air cavity 211 passes through the front side and the rear side of the secondary air sleeve 210 respectively. That is, the front side and the rear side of the secondary air sleeve 210 are both open structures. Therefore, the secondary air (or secondary combustion air) can flow into the second air cavity 211 from the back to the front.

[0055] In this embodiment, the secondary air sleeve 210 is a cylindrical sleeve, and the second air cavity 211 is a cylindrical cavity. The secondary air sleeve 210 is coaxially arranged with the primary air sleeve 220. The primary air sleeve 220, mixing sleeve 240, impeller assembly 270, and ammonia pipe 230 are all located in the second air cavity 211.

[0056] The air disc 250 is located at the front end of the secondary air sleeve 210 and is disposed at the front end of the second air cavity 211. The outer wall of the air disc 250 contacts the inner wall of the second air cavity 211, sealing the second air cavity 211. The air disc 250 is fixedly connected to the front end of the mixing sleeve 240 by welding, snap-fitting, or other methods, which are not limited herein. In this embodiment, the air disc 250 is in the shape of a circular plate. The front side of the air disc 250 is flush with the front side of the secondary air sleeve 210.

[0057] The air disc 250 is equipped with swirl grooves 251, which extend through the front and rear sides of the air disc 250 and connect to the second air cavity 211. There are multiple swirl grooves 251, all of which are arranged in a circular pattern around the central axis of the air disc 250. It is understood that the secondary air in the second air cavity 211 can flow out through the swirl grooves 251 and forward. The angle between the projection line of the swirl grooves 251 and the central axis of the air disc 250 is 45°.

[0058] The wind disc 250 is also provided with a spray hole 261, and the spray hole 261 is connected to the mixing chamber 241. There are multiple spray holes 261, and they are arranged in a circle around the central axis of the wind disc 250. Specifically, a nozzle 260 is provided at the front end of the wind disc 250. The nozzle 260 is a blunt body with a cylindrical shape and chamfers. A third air cavity is formed in the interior of the nozzle 260. The third air cavity passes through the rear side of the nozzle 260 and the rear side of the wind disc 250, and the third air cavity is connected to the mixing chamber 241. All the spray holes 261 are provided on the nozzle 260 and are connected to the third air cavity. All the spray holes 261 are provided along the radial extension of the nozzle 260 and are arranged in a circle around the central axis of the nozzle 260. The setting of the nozzle 260 can stabilize the flame.

[0059] Of course, in other embodiments, the spray hole 261 may be provided on the front side of the spray head 260 , or on the outer peripheral wall of the spray head 260 , and may be provided at an angle.

[0060] It is understood that in the pure ammonia burner 200 provided in the embodiment of the present invention, since a rotatable impeller assembly 270 is provided at the front end of the ammonia pipe 230, the impeller assembly 270 is located in the mixing chamber 241 of the mixing sleeve 240, the first air hole 242 of the mixing sleeve 240 is arranged opposite to the first flow channel 271 of the impeller assembly 270, and the second air hole 273 of the impeller assembly 270 is arranged opposite to the ammonia hole of the ammonia pipe 230. Therefore, when the primary air flows from the first air sleeve through the first air hole 242 of the mixing sleeve 240 into the first impeller, The flow channel 271 utilizes the kinetic energy of the primary air to drive the first impeller to rotate rapidly around the ammonia pipe 230; at this time, since the first impeller and the second impeller are connected, the second impeller also rotates around the ammonia pipe 230 under the driving action of the first impeller. During the rotation of the second impeller, a certain negative pressure is formed at the second inlet of the second flow channel 272. Under the action of the negative pressure, the ammonia in the ammonia pipe 230 flows into the second flow channel 272 of the second impeller through the ammonia hole and the second air hole 273. At the same time, the primary air in the first flow channel 271 also flows into the second flow channel 272.

[0061] In the second flow channel 272, the primary air and ammonia are mixed to form a combustible mixed gas, which is thrown outward under the rotation of the second impeller, thereby strengthening the mixing degree of the primary air and ammonia, and further improving the mixing uniformity of the ammonia and the primary air, which helps to improve the ignition success rate and enable the ammonia to burn more stably.

[0062] The mixed gas in the mixing chamber 241 flows out through the nozzle 261 of the wind disk 250. After ignition, the ammonia can burn quickly to form a rich premixed flame. Moreover, the secondary air in the secondary air sleeve 210 flows out through the swirl groove 251, forming a rotating airflow on the periphery of the rich premixed flame, producing a stirring effect, promoting the secondary mixing of the secondary air and the unburned ammonia, so that the ammonia is fully burned, thereby improving the utilization rate of the ammonia and the flame stability.

[0063] In some embodiments, the outer diameter of the first impeller is consistent with the inner diameter of the mixing chamber 241, so that the outer peripheral wall of the first impeller contacts the inner peripheral wall of the mixing chamber 241. The contact surface between the first impeller and the mixing chamber 241 can be smooth, with low friction, to reduce the resistance experienced by the first impeller during rotation.

[0064] It can be understood that this can reduce the distance between the first inlet of the first impeller and the first air hole 242 of the mixing chamber 241, thereby reducing the total amount of primary air leaking from the distance, and enabling the primary air flowing out of the first air hole 242 to flow into the first flow channel 271, making full use of the kinetic energy of the primary air, and enabling the first impeller to rotate rapidly.

[0065] In some embodiments, the air inlet direction of the first air hole 242 is tangential to the inner circumferential wall of the mixing chamber 241. This configuration allows the primary air flowing out of the first air hole 242 to more strongly impact the blades of the first impeller, causing the primary air to exert a sufficiently strong force on the blades of the first impeller to accelerate the rotation speed of the first impeller, allowing the ammonia in the ammonia pipe 230 to continuously flow into the second impeller and mix with the primary air.

[0066] In some embodiments, the second air holes 273 and the ammonia holes are inclined from back to front toward the second flow channel 272. This design allows the direction of ammonia flowing into the second flow channel 272 to form an acute angle with the direction of primary air flowing into the second flow channel 272, allowing the ammonia and primary air to be thoroughly mixed. Of course, the direction of ammonia flowing into the second flow channel 272 may be perpendicular to the direction of primary air flowing into the second flow channel 272.

[0067] In some embodiments, the air disc 250 is further provided with first through holes 253. The first through holes 253 extend through the front and rear sides of the air disc 250, respectively. The first through holes 253 communicate with the mixing chamber 241 of the mixing sleeve 240. There are multiple first through holes 253, all of which are arranged in a circle around the central axis of the nozzle 260. The first through holes 253 are located between the nozzle 260 and the swirl groove 251. The first through holes 253 are located near the nozzle 260.

[0068] With this arrangement, part of the mixed gas in the mixing chamber 241 flows out from the nozzle 261, and the other part of the mixed gas flows forward from the first through hole 253, which can push the mixed gas at the nozzle 261 to flow forward, speed up the forward flow of the mixed gas, and help increase the flame length.

[0069] In some embodiments, the air disc 250 is further provided with a second through hole 252, the central axis of which extends in the front-to-back direction. The second through hole 252 is connected to the second air cavity 211. There are multiple second through holes 252, all of which are arranged in a circle around the central axis of the nozzle 260. The second through holes 252 are located between the swirl groove 251 and the first through hole 253. The aperture of the second through hole 252 can be larger than that of the first through hole 253. When viewed in the front-to-back direction, the second through hole 252 and the first through hole 253 can be staggered or located on the same radial extension line of the air disc 250. The ratio of the area of ​​the second through hole 252 to that of the swirl groove 251 ranges from 1.0 to 1.2.

[0070] Such a setting can increase the area of ​​secondary air outflow, provide more combustion-supporting air for the mixed gas, and the secondary air flowing out from the second through hole 252 can push the mixed gas forward, further increase the flow speed of the mixed gas, shorten the residence time of the mixed gas at the nozzle 260, reduce the combustion ratio of ammonia at the nozzle 260, and allow part of the unburned ammonia to reduce the nitrogen oxides produced by the combustion of ammonia during the forward flow, thereby achieving the effect of zero nitrogen oxide emissions and ultimately realizing the clean combustion of ammonia. Such a setting can lay the foundation for the clean combustion utilization of ammonia in the field of industrial burners.

[0071] The pure ammonia burner 200 is provided with an ignition electrode that extends forward and backward, with the front end of the ignition electrode fixedly connected to the air disk 250. Specifically, the air disk 250 is provided with an electrode positioning hole, through which the ignition electrode is inserted. A high-voltage arc is generated between the ignition electrode and the nozzle 260, which can ignite the mixed gas located at the nozzle 260 and achieve stable combustion of pure ammonia. The ignition electrode is mainly composed of a discharge terminal, an electrode rod, and a ceramic insulating sleeve. The discharge terminal is provided at the front end of the electrode rod, which is connected to the high-voltage ignition power line. The ceramic insulating sleeve is used to protect the electrode rod, thereby isolating the electrode rod from components such as the air disk 250.

[0072] In addition, if Figure 1 and Figure 2 As shown, an embodiment of the present invention further provides a combustion device comprising a burner sleeve 100 and the pure ammonia burner 200 of the above-described embodiment. The combustion device can be mounted on the side wall of a kiln. This combustion device has a unique structure and low cost, can achieve zero nitrogen oxide emissions, and promotes the better application of ammonia in the field of burner technology.

[0073] The burner sleeve 100 has two ends extending in the front-to-back direction. The burner sleeve 100 is hollow, forming an inner cavity 101. The inner cavity 101 extends through the front and rear sides of the burner sleeve 100, respectively. Therefore, the front and rear sides of the burner sleeve 100 are both open. The pure ammonia burner 200 is disposed within the inner cavity 101 of the burner sleeve 100 and is located at the rear end of the burner sleeve 100. The placement of the pure ammonia burner 200 shields and seals the rear end opening of the burner sleeve 100. When ignited, the pure ammonia burner 200 produces a flame that erupts from the front opening of the burner sleeve 100.

[0074] In this embodiment, the burner sleeve 100 can be made of silicon carbide. It includes a small-diameter straight cylindrical portion 110, a tapered cylindrical portion 120, and a large-diameter straight cylindrical portion 130. The front end of the tapered cylindrical portion 120 is fixedly connected to the small-diameter straight cylindrical portion 110, while the rear end of the tapered cylindrical portion 120 is fixedly connected to the large-diameter straight cylindrical portion 130. The three components are connected using an integrated molding process.

[0075] The inner diameter of the small-diameter straight cylindrical portion 110 is D1, the inner diameter of the large-diameter straight cylindrical portion 130 is D2, and the outer diameter of the secondary air sleeve 210 of the pure ammonia burner 200 is D3. The length of the small-diameter straight cylindrical portion 110 is L1, the length of the tapered cylindrical portion 120 is L2, the length of the large-diameter straight cylindrical portion 130 is L3, and the length of the secondary air sleeve 210 of the pure ammonia burner 200 is L4. The angle formed between the inner wall of the tapered cylindrical portion 120 and the longitudinal axis is α. In this embodiment, D1 = 0.5 × D2, D2 = 1.2 × D3, L3 = L4 + 3 × D3, L2 = 0.5 × D2, L1 = 0.25 × D2, and α = 15°.

[0076] In some embodiments, the outer wall of the secondary air sleeve 210 is provided with third air holes 212, which are connected to the second air cavity 211. There are multiple third air holes 212, and all third air holes 212 are arranged in a circle around the central axis of the second air cavity 211. Because there is a certain gap between the outer wall of the secondary air sleeve 210 and the inner wall of the burner sleeve 100, the provision of the third air holes 212 allows the secondary air flowing out of the third air holes 212 to cool the burner sleeve 100, thereby reducing the wall temperature of the burner sleeve 100 and preventing the burner sleeve 100 from overheating and thus shortening its service life.

[0077] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A pure ammonia burner, characterized in that: include: an ammonia pipe extending forward and backward and having ammonia holes formed on its outer wall; a mixing sleeve extending forward and backward and having a mixing chamber, wherein a first air hole is provided on an outer peripheral wall of the mixing chamber, and a front end of the ammonia pipe passes through the mixing chamber; an impeller assembly rotatably connected to the front end of the ammonia pipe, the impeller assembly comprising a first impeller and a second impeller coaxially connected, the first impeller being located on the rear side of the second impeller, the first impeller having a first flow channel, the outer end of the first flow channel being a first inlet connected to the first air hole, the inner end of the first flow channel being a first outlet, the second impeller having a second flow channel, the outer end of the second flow channel being a second outlet connected to the mixing chamber, the inner end of the second flow channel being a second inlet connected to the first outlet, the second impeller being provided with a second air hole connected to the ammonia air hole, the second air hole being connected to the second flow channel; a primary air sleeve having a first air cavity, wherein the rear end of the mixing sleeve passes through the first air cavity, and the first air hole is in communication with the first air cavity; A secondary air sleeve having a second air cavity running through the front and back, a wind disc provided at the front end of the second air cavity, the wind disc being connected to the front end of the mixing sleeve, the wind disc being provided with a swirl groove communicating with the second air cavity and a first through hole communicating with the mixing cavity; A nozzle is provided at the front end of the wind disk, and the nozzle is provided with a third air cavity. The third air cavity runs through the rear side of the wind disk and is connected with the mixing cavity. The nozzle is provided with a plurality of spray holes extending radially, and the spray holes are connected with the third air cavity and are arranged circumferentially around the nozzle; a plurality of first through holes are provided and are arranged circumferentially around the nozzle; the wind disk is provided with a second through hole connected with the second air cavity, a plurality of second through holes are provided and are arranged circumferentially around the nozzle, and the second through hole is located between the swirl groove and the first through hole.

2. The pure ammonia burner according to claim 1, characterized in that: The outer peripheral wall surface of the first impeller contacts the inner peripheral wall surface of the mixing chamber.

3. The pure ammonia burner according to claim 2, characterized in that: The air inlet direction of the first air hole is tangent to the inner peripheral wall surface of the mixing chamber.

4. The pure ammonia burner according to claim 3, characterized in that: The second air hole and the ammonia air hole are inclined from back to front toward the second flow channel.

5. The pure ammonia burner according to claim 4, characterized in that: The first air holes, the second air holes and the ammonia air holes are each provided in plurality and are all arranged in a circle.

6. A combustion device, characterized in that: It comprises a burner sleeve and the pure ammonia burner according to any one of claims 1 to 5, wherein the burner sleeve extends front to back and has an inner cavity running through the front and back, and the pure ammonia burner is arranged in the inner cavity and located at the rear end of the burner sleeve.

7. The combustion device according to claim 6, characterized in that The outer peripheral wall surface of the secondary air sleeve is provided with third air holes communicating with the second air cavity. There are a plurality of third air holes and they are arranged in a circle around the central axis of the second air cavity.

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