Hydrogen-ammonia mixed low-nitrogen emission combustor
By placing the air inlet pipes on both sides of the tank in the hydrogen-ammonia burner and using the mixing cylinder and air guiding assembly to achieve premixing of hydrogen-ammonia gas, the problem of burner installation in a confined space is solved, and uniform mixing of hydrogen-ammonia gas and low nitrogen oxide emissions are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIAOYANG GUOCHENG THERMAL POWER CO LTD
- Filing Date
- 2026-03-20
- Publication Date
- 2026-05-12
AI Technical Summary
The existing design of the intake pipe of the hydrogen-ammonia coupled low-NOx burner results in a large horizontal length of the device, which occupies a lot of space and makes it difficult to install correctly in the confined space near industrial boilers.
Two air inlet pipes are respectively installed on the side walls on both sides of the tank, and hydrogen and ammonia are premixed through a mixing cylinder and a gas guiding assembly. The design of the mixing cylinder shortens the horizontal length, and the gas is uniformly mixed through the gas guiding chamber and the gas baffle ring.
The horizontal length of the burner has been shortened to accommodate installation in confined spaces, ensuring continuous mixing and efficient combustion of hydrogen and ammonia, and reducing the generation of nitrogen oxides.
Smart Images
Figure CN122015092A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of boiler burner technology, specifically to a hydrogen-ammonia mixed low-NOx emission burner. Background Technology
[0002] Burners are crucial equipment in industrial boilers. Hydrogen and ammonia are used in boiler applications. Hydrogen combustion produces only water, while ammonia combustion produces no carbon dioxide. Both have readily available raw materials, enabling green production. The addition of ammonia effectively lowers the combustion temperature. To prevent the excessively high temperatures during hydrogen-ammonia combustion from generating large amounts of nitrogen oxides, hydrogen and ammonia need to be premixed before combustion. For example, Chinese utility model patent application number CN202520234233.1 provides a hydrogen-ammonia coupled low-NOx burner. In this device, hydrogen and ammonia inlet pipes transport hydrogen and ammonia, respectively. A conical manifold is installed inside the first tank. As the hydrogen and ammonia pass through the first tank, the conical manifold concentrates the gases, thus achieving premixing.
[0003] The drawback of this device is that both air inlet pipes are located on the end face of the second tank away from the cover, resulting in a relatively long horizontal length and occupying a significant amount of space. In practical use, if the space near the industrial boiler is limited, the device cannot be installed correctly. Summary of the Invention
[0004] The purpose of this invention is to provide a hydrogen-ammonia mixed low-NOx emission burner, in which two air inlet pipes are respectively located on the side walls on both sides of the tank, shortening the length in the horizontal direction and thus occupying less space, thereby adapting to the narrow space near industrial boilers and ensuring that the invention can be installed in place.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydrogen-ammonia mixed low-NOx emission burner, comprising: a gas supply assembly, the gas supply assembly including a tank body, with an air inlet pipe on each side of the tank body; a gas mixing assembly disposed inside the tank body, the gas mixing assembly including a gas mixing cylinder, the gas mixing cylinder having a plurality of gas mixing plates on its inner wall, the diameter of the first end of the gas mixing cylinder being larger than the diameter of the second end, and both air inlet pipes being disposed on the side close to the first end of the gas mixing cylinder; and a combustion assembly disposed outside the tank body, the combustion assembly including a cover, with a nozzle disposed between the cover and the second end of the gas mixing cylinder.
[0006] Preferably, the first end of the mixing cylinder is provided with an expansion section, which is rotatably connected to the inner wall of the tank. The outer surface of the expansion section is provided with a first groove and a second groove. The two air inlet pipes are respectively positioned corresponding to the first groove and the second groove. The first groove is connected to the first air delivery channel, and the second groove is connected to the second air delivery channel.
[0007] Preferably, there are multiple first grooves and multiple second grooves, and the multiple first grooves and multiple second grooves are arranged alternately. A one-way valve is provided in both the first gas delivery channel and the second gas delivery channel.
[0008] Preferably, the tops of two adjacent first grooves are connected by a first air distribution groove, and the tops of two adjacent second grooves are connected by a second air distribution groove.
[0009] Preferably, the first gas delivery channel is located at the bottom of the first groove, the second gas delivery channel is located at the bottom of the second groove, the first groove and the second groove have the same depth, the first gas distribution groove and the second gas distribution groove have the same depth, and the depth of the first gas distribution groove is less than the depth of the first groove.
[0010] Preferably, a force-bearing plate is fixedly provided in both the first groove and the second groove, the width of the first gas distribution groove and the second gas distribution groove are the same, the width of the force-bearing plate is smaller than the width of the first gas distribution groove, and there is a gap between the force-bearing plate and the inner wall of the tank.
[0011] Preferably, it further includes a gas guiding assembly, which is disposed in the tank body and located on the side of the mixing cylinder away from the combustion assembly. The gas guiding assembly includes: a baffle ring, fixedly disposed on the side wall of the expansion portion, the central axis of the baffle ring being collinear with the central axis of the mixing cylinder; and a limiting member, fixedly disposed on the inner wall of the tank body, the limiting member having a gas guiding cavity at its edge facing the mixing cylinder, the baffle ring extending into the gas guiding cavity, and the interior of the first gas delivery channel, the second gas delivery channel, and the mixing cylinder all communicating with the gas guiding cavity.
[0012] Preferably, a support rod is provided at the center of the limiting member, and a plurality of stationary plates are fixedly provided on the side wall of the support rod, with the plurality of mixing plates and the plurality of stationary plates being arranged alternately.
[0013] Compared with the prior art, the beneficial effects of the present invention are: (i) In this invention, the two inlet pipes are respectively located on the side walls of both sides of the tank, shortening their horizontal length and thus occupying less space. This allows them to fit into the confined space near industrial boilers, ensuring proper installation. When the mixing cylinder rotates, the hydrogen gas discharged from the inlet pipes first enters the first gas distribution groove and then the first recess. This prevents the outlet of the inlet pipe from being blocked, ensuring a continuous flow of hydrogen gas into the first gas distribution groove and allowing the mixing cylinder to rotate continuously. Similarly, the ammonia gas discharged from the inlet pipes first enters the second gas distribution groove and then the second recess. This prevents the outlet of the inlet pipe from being blocked, ensuring a continuous flow of ammonia gas into the second gas distribution groove and allowing the mixing cylinder to rotate continuously.
[0014] (ii) The present invention also includes a gas guiding assembly. Hydrogen gas in the first groove can enter the gas guiding chamber after being discharged through the first gas delivery channel, and ammonia gas in the second groove can also enter the gas guiding chamber after being discharged through the second gas delivery channel. At this time, hydrogen and ammonia gas in the gas guiding chamber can move along the outer wall of the baffle ring and complete pre-mixing during the movement. When the mixing plate rotates together with the mixing cylinder, several mixing plates and several stationary plates cooperate with each other to make hydrogen and ammonia gas mixed evenly. Attached Figure Description
[0015] Figure 1 This is an isometric view of the present invention; Figure 2 This is a front sectional view of the present invention; Figure 3 This is an isometric sectional view of the gas delivery assembly in this invention; Figure 4 This is an isometric view of the air-fuel mixing assembly in this invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is an isometric sectional view of the air-fuel mixture assembly in this invention; Figure 7 This is an isometric sectional view of the combustion assembly in this invention; Figure 8 This is an isometric view of the air guide assembly in this invention.
[0016] The reference numerals in the figures include: 1-Gas delivery assembly, 11-Tank body, 12-Inlet pipe, 2-Gas mixing assembly, 21-Gas mixing cylinder, 211-Expansion section, 212-First groove, 213-Second groove, 214-First gas delivery channel, 215-Second gas delivery channel, 216-First gas distribution groove, 217-Second gas distribution groove, 22-Gas mixing plate, 23-One-way valve, 24-Force plate, 3-Combustion assembly, 31-Cover body, 32-Nozzle, 33-Igniter, 34-Temperature sensor, 4-Gas guide assembly, 41-Gas baffle ring, 42-Limiting component, 421-Gas guide chamber, 43-Support rod, 44-Stationary plate. Detailed Implementation
[0017] 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.
[0018] Example 1
[0019] Please see Figure 1-8 This invention provides a technical solution: a hydrogen-ammonia mixed low-NOx emission burner, comprising a gas supply assembly 1, a gas mixing assembly 2, and a combustion assembly 3. The gas supply assembly 1 includes a tank 11 and two inlet pipes 12; the gas mixing assembly 2 includes a mixing cylinder 21 and several mixing plates 22; and the combustion assembly 3 includes a cover 31 and nozzles 32. In this invention, the two inlet pipes 12 are respectively located on the side walls of both sides of the tank 11, shortening their horizontal length and thus occupying less space, thereby adapting to the confined space near industrial boilers and ensuring proper installation. In use, the cover 31 is connected to the industrial boiler, and hydrogen and ammonia enter the tank 11 through the two inlet pipes 12 respectively. The hydrogen and ammonia then enter the mixing cylinder 21 together and pass through it. Because the diameter of the first end of the mixing cylinder 21 is larger than the diameter of the second end, and the several mixing plates 22 are evenly arranged on the inner wall of the mixing cylinder 21, the hydrogen and ammonia gradually mix together after colliding with the mixing plates 22. After hydrogen and ammonia are fully mixed, they enter the nozzle 32 from the mixing cylinder 21, and then enter the enclosure 31 from the nozzle 32. An igniter 33 and a temperature sensor 34 are respectively installed on both sides of the nozzle 32. The igniter 33 ignites the gas, and the temperature sensor 34 records the temperature. Circular holes in the enclosure 31 allow air to enter, ensuring complete combustion and reducing the formation of nitrogen oxides.
[0020] Please see Figure 1-6The mixing cylinder 21 has an expansion section 211 at its first end, which is rotatably connected to the inner wall of the tank 11. The mixing cylinder 21 is also rotatably connected to the nozzle 32. The outer surface of the expansion section 211 has a first groove 212 and a second groove 213. The first groove 212 communicates with the first gas delivery channel 214, and the second groove 213 communicates with the second gas delivery channel 215. Both inlet pipes 12 are inclined. When hydrogen enters the tank 11 through one of the inlet pipes 12, it enters the first groove 212 and rotates the mixing cylinder 21. When ammonia enters the tank 11 through the other inlet pipe 12, it enters the second groove 213 and similarly rotates the mixing cylinder 21. Hydrogen in the first groove 212 can enter the mixing cylinder 21 through the first gas delivery channel 214, and ammonia in the second groove 213 can enter the mixing cylinder 21 through the second gas delivery channel 215, thus allowing hydrogen and ammonia to mix. When the mixing cylinder 21 rotates, it drives several mixing plates 22 to rotate together, thus continuously stirring the hydrogen and ammonia, ensuring thorough mixing. In this embodiment, there are multiple first grooves 212 and multiple second grooves 213, ensuring that hydrogen and ammonia can continuously enter different first grooves 212 and second grooves 213, allowing the mixing cylinder 21 to rotate continuously. The multiple first grooves 212 and multiple second grooves 213 are staggered, so the first gas delivery channel 214 and the second gas delivery channel 215 will not interfere with each other. One-way valves 23 are provided in both the first gas delivery channel 214 and the second gas delivery channel 215 to ensure that the mixed hydrogen and ammonia in the mixing cylinder 21 do not move back into the first gas delivery channel 214 and the second gas delivery channel 215.
[0021] Example 2
[0022] Based on Example 1, please refer to Figure 1-6 The tops of two adjacent first grooves 212 are connected by a first gas distribution groove 216, and the tops of two adjacent second grooves 213 are connected by a second gas distribution groove 217. When the mixing cylinder 21 rotates, the hydrogen inlet pipe 12 may sometimes be positioned between two adjacent first grooves 212. In this case, the hydrogen discharged from the inlet pipe 12 can first enter the first gas distribution groove 216 and then enter the first groove 212. This prevents the outlet of the inlet pipe 12 from being blocked, ensuring that hydrogen can continuously enter the first gas distribution groove 216 and the mixing cylinder 21 can continue to rotate. Similarly, the ammonia inlet pipe 12 may sometimes be positioned between two adjacent second grooves 213. In this case, the ammonia discharged from the inlet pipe 12 can first enter the second gas distribution groove 217 and then enter the second groove 213. This prevents the outlet of the inlet pipe 12 from being blocked, ensuring that ammonia can continuously enter the second gas distribution groove 217 and the mixing cylinder 21 can continue to rotate.
[0023] Please see Figure 1-6The first gas delivery channel 214 is located at the bottom of the first groove 212, and the second gas delivery channel 215 is located at the bottom of the second groove 213. The first groove 212 and the second groove 213 have the same depth, and the first gas distribution groove 216 and the second gas distribution groove 217 have the same depth, except that the depth of the first gas distribution groove 216 is less than the depth of the first groove 212. When the two inlet pipes 12 are aligned with the first groove 212 and the second groove 213 respectively, the hydrogen gas discharged from the inlet pipe 12 has a large contact area with the first groove 212, and the ammonia gas discharged from the inlet pipe 12 has a large contact area with the second groove 213, making the mixing cylinder 21 rotate faster and more stably.
[0024] Please see Figure 1-6 A force-bearing plate 24 is fixedly installed in both the first groove 212 and the second groove 213. Hydrogen gas entering the first groove 212 from the first gas distribution channel 216 and ammonia gas entering the second groove 213 from the second gas distribution channel 217 will directly contact the force-bearing plate 24, thereby driving the mixing cylinder 21 to rotate. The first gas distribution channel 216 and the second gas distribution channel 217 have the same width, while the width of the force-bearing plate 24 is smaller than the width of the first gas distribution channel 216. After colliding with the force-bearing plate 24, hydrogen gas can enter the first groove 212 from both sides of the force-bearing plate 24, and then enter the first gas delivery channel 214. After colliding with the force-bearing plate 24, ammonia gas can enter the second groove 213 from both sides of the force-bearing plate 24, and then enter the second gas delivery channel 215. There is a gap between the force-bearing plate 24 and the inner wall of the tank 11, so the force-bearing plate 24 will not collide with the inner wall of the tank 11 when rotating with the mixing cylinder 21.
[0025] Example 3
[0026] Based on Example 1, please refer to Figure 1-8 The invention also includes a gas guiding assembly 4, which includes a baffle ring 41, a limiting member 42, a support rod 43, and several stationary plates 44. The limiting member 42 has a gas guiding cavity 421 at its edge facing the mixing cylinder 21, and the baffle ring 41 extends into the gas guiding cavity 421. Hydrogen gas in the first groove 212 can enter the gas guiding cavity 421 after being discharged through the first gas delivery channel 214, and ammonia gas in the second groove 213 can also enter the gas guiding cavity 421 after being discharged through the second gas delivery channel 215. At this time, the hydrogen and ammonia gas in the gas guiding cavity 421 can move along the outer wall of the baffle ring 41 and complete pre-mixing during the movement. The pre-mixed hydrogen and ammonia gas will move in a "U"-shaped path, and after winding around the inner side of the baffle ring 41, enter the mixing cylinder 21. The support rod 43 is located at the center of the limiting member 42 and extends into the mixing cylinder 21. Several stationary plates 44 are provided on the side wall of the support rod 43 and are staggered with several mixing plates 22. When the mixing plates 22 rotate together with the mixing cylinder 21, the mixing plates 22 and the stationary plates 44 cooperate with each other to make the hydrogen and ammonia gas mix evenly.
[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0028] 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. A hydrogen-ammonia mixed low-NOx burner, characterized in that, include: A gas delivery assembly, the gas delivery assembly including a tank body, with an air inlet pipe on each side of the tank body; A gas mixing assembly is disposed inside the tank body. The gas mixing assembly includes a gas mixing cylinder. Several gas mixing plates are provided on the inner wall of the gas mixing cylinder. The diameter of the first end of the gas mixing cylinder is larger than the diameter of the second end. Both gas inlet pipes are disposed on the side close to the first end of the gas mixing cylinder. A combustion assembly is disposed on the outside of the tank body. The combustion assembly includes a cover, and a nozzle is provided between the cover and the second end of the mixing cylinder.
2. The hydrogen-ammonia mixed low-NOx emission burner according to claim 1, characterized in that, The first end of the mixing cylinder is provided with an expansion section, which is rotatably connected to the inner wall of the tank. The outer surface of the expansion section is provided with a first groove and a second groove. The two air inlet pipes are respectively positioned opposite to the first groove and the second groove. The first groove is connected to the first air delivery channel, and the second groove is connected to the second air delivery channel.
3. The hydrogen-ammonia mixed low-NOx burner according to claim 2, characterized in that, There are multiple first grooves and multiple second grooves, and the multiple first grooves and multiple second grooves are arranged alternately. A one-way valve is provided in both the first gas supply channel and the second gas supply channel.
4. The hydrogen-ammonia mixed low-NOx emission burner according to claim 3, characterized in that, The tops of two adjacent first grooves are connected by a first air distribution groove, and the tops of two adjacent second grooves are connected by a second air distribution groove.
5. The hydrogen-ammonia mixed low-NOx emission burner according to claim 4, characterized in that, The first gas delivery channel is located at the bottom of the first groove, the second gas delivery channel is located at the bottom of the second groove, the first groove and the second groove have the same depth, the first gas distribution groove and the second gas distribution groove have the same depth, and the depth of the first gas distribution groove is less than the depth of the first groove.
6. The hydrogen-ammonia mixed low-NOx emission burner according to claim 4, characterized in that, A force-bearing plate is fixedly installed in both the first groove and the second groove. The widths of the first and second gas distribution grooves are the same. The width of the force-bearing plate is smaller than the width of the first gas distribution groove. There is a gap between the force-bearing plate and the inner wall of the tank.
7. The hydrogen-ammonia mixed low-NOx emission burner according to claim 3, characterized in that, It also includes a gas guiding assembly, which is disposed within the tank and located on the side of the mixing cylinder away from the combustion assembly. The gas guiding assembly includes: An air baffle ring is fixedly installed on the side wall of the expanded part, and the central axis of the air baffle ring is collinear with the central axis of the mixing cylinder. A limiting component is fixedly installed on the inner wall of the tank. The limiting component has an air guiding cavity at its edge facing the mixing cylinder. The air baffle ring extends into the air guiding cavity. The first air supply channel, the second air supply channel, and the interior of the mixing cylinder are all connected to the air guiding cavity.
8. The hydrogen-ammonia mixed low-NOx emission burner according to claim 7, characterized in that, A support rod is provided at the center of the limiting member, and several stationary plates are fixedly installed on the side wall of the support rod. The several gas mixing plates and the several stationary plates are arranged alternately.