Flame stabilizer burner and flame stabilization method

Abstract

The present invention relates to a flame-stabilizing burner and a flame-stabilizing method. The flame-stabilizing burner includes a burner body and an igniter. The burner body is provided with a gas nozzle and an air nozzle, and multiple air nozzles are arranged circumferentially outside the gas nozzles. These multiple air nozzles are oriented at slightly different angles, allowing them to generate at least several air jets that form different spatial angles with the central axis of the burner body. These air jets intersect with the gas jets generated by the gas nozzles, forming multiple flame-stabilizing vortices at different depths along the central axis of the burner body. Compared with the prior art, the flame-stabilizing burner of the present invention, with multiple air nozzles oriented at different angles, generates multiple flame-stabilizing ignition points that are not at the same plane height with the gas jets generated by the gas nozzles. This gives the flame-stabilizing burner a larger gas regulation ratio, ensuring complete combustion even when the gas flow rate at the gas nozzles is low, resulting in better performance.

Description

Technical Field

[0001] This invention belongs to the field of burner technology, specifically relating to flame stabilizer burners and flame stabilization methods. Background Technology

[0002] For an industrial burner, ensuring stable and safe combustion of the flame is extremely important. Once the gas is ignited, maintaining a stable and continuous flame propagation under different operating conditions is the most basic performance characteristic of a burner.

[0003] In engineering, it is desirable for fuels and combustion gases to maintain stable chemical reactions and heat release for ease of control and engineering applications. Therefore, it is often required that the flame in the burner remain stable at a preset position: ignition at a specific location, combustion chemical reactions occurring at a set rate, burnout at a specific location, and exiting the combustion chamber. During fuel combustion, fuel, oxygen, and combustion products typically flow at high speeds, exhibiting velocity, temperature, and concentration gradients. Chemical reactions occur during this flow, accompanied by momentum, energy, and mass exchange. Therefore, the flame stabilization mechanism is extremely complex.

[0004] Existing industrial burners generally include a gas nozzle located in the center and multiple air nozzles located on the periphery. The air nozzles are positioned at the same angle towards the gas jet generated by the gas nozzle. The air jets from the air nozzles mix with the gas jet to form a stable flame ignition point, which provides a stable flame and prevents it from extinguishing along the burner's axial direction. However, in existing industrial burners, the stable flame ignition point formed by the airflow from the gas nozzle and air nozzles is relatively singular. When the gas flow rate from the gas nozzle is low, the burner struggles to form a stable flame ignition point, failing to ignite properly. The ejected gas does not burn completely, resulting in a low gas regulation ratio. Summary of the Invention

[0005] The purpose of this invention is to overcome the technical problem of low gas regulation ratio in existing burners, and to provide a flame-stabilizing burner and flame-stabilizing method that generates multiple flame-stabilizing vortices with gas nozzles arranged at multiple angles and having a large gas regulation ratio.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A flame-stabilizing burner includes a burner body and an igniter. The burner body is provided with a gas nozzle and an air nozzle. Multiple air nozzles are arranged circumferentially outside the gas nozzle. The multiple air nozzles are oriented at different angles, so that the multiple air nozzles can generate at least a few air jets that form different spatial angles with the central axis of the burner body. The air jets intersect with the gas jets generated by the gas nozzles to form multiple flame-stabilizing vortices at different depths along the central axis of the burner body.

[0008] Compared with the prior art, the flame stabilizer burner of the present invention has multiple air nozzles facing at different angles, and the air jets generated form multiple flame stabilization ignition points at different plane heights with the gas jets generated by the gas nozzles. This gives the flame stabilizer burner a larger gas regulation ratio, and even when the gas flow rate of the gas nozzles is small, the gas can still be fully combusted, resulting in good performance.

[0009] Furthermore, the gas nozzle includes a main gas nozzle arranged along the central axis of the burner body and sub-gas nozzles arranged circumferentially outside the main gas nozzle. The sub-gas nozzles are arranged at slightly different angles toward the air nozzle, so that the gas jets generated by the sub-gas nozzles intersect with the air jets to form multiple flame-stabilizing vortices at different depths along the central axis of the burner body. With this arrangement, the flame-stabilizing burner has more flame-stabilizing vortices in the radial plane along the axial direction, with a larger range and denser flame-stabilizing ignition points, resulting in better flame stabilization effect and higher adjustment precision.

[0010] Furthermore, the air nozzles are arranged in at least one ring around the outer periphery of the gas nozzles, and the air nozzles are arranged circumferentially outside the gas nozzles. Alternatively, the air nozzles are arranged discretely inside and outside the same circumferential line on the outer periphery of the gas nozzles. This arrangement allows the flame stabilizer to generate more interlaced and dense flame stabilizing vortices, resulting in a better flame stabilization effect.

[0011] Furthermore, it also includes multiple auxiliary mixed gas nozzles located on the circumferential edge of the burner body. The auxiliary mixed gas nozzles are inclined in the same circumferential direction and are used to generate air jets. By setting it in this way, the air jet of the outermost auxiliary mixed gas nozzle has a certain circumferential tilting speed, forming a rotating flame flow with a certain swirling speed, so as to improve the mixing quality of air and fuel gas by strengthening or weakening.

[0012] Furthermore, the air jet velocity is greater than the gas jet velocity; with this configuration, the higher-velocity air jet has a stronger entrainment capacity for the lower-velocity gas jet, promoting mixing.

[0013] Furthermore, the gas nozzle includes a main gas nozzle arranged along the central axis of the burner body, and the inner diameter of the main gas nozzle is larger than the inner diameter of the air nozzle. This arrangement ensures that the main gas nozzle provides sufficient gas to mutually entrain and form multiple flame-stabilizing vortices with multiple air jets, resulting in a good flame stabilization effect.

[0014] Furthermore, the spatial angle formed between the air jet and the central axis of the burner body is less than 45°; by setting it in this way, the momentum of the air jet is mainly axial, which gives the flame a greater axial velocity and impulse, a greater flue gas entrainment capacity and airflow circulation ratio in the heating furnace, and lower nitrogen oxide emissions.

[0015] Furthermore, at least one of the sub-gas nozzles corresponds to two of the air nozzles, such that the gas jet generated by the sub-gas nozzle is placed between the two air jets generated by the two air nozzles. With this arrangement, when two air jets sandwich a gas jet and meet at a certain spatial angle, the two high-speed air jets will "tear" the gas jet sandwiched in the middle in two directions until it breaks up, merges, and completes the exchange of mass and momentum. During this process, the combustor nozzle plane to the confluence of the three jets, the staggered stage of the three jets, and the complex jet formed after the confluence will create multiple directions, velocities, intensities, sizes, and compositions that constitute different vortex structures, and automatically generate the flame stabilization point and the initial combustion point.

[0016] A flame stabilization method relates to a flame-stabilizing burner, which has at least one gas nozzle and multiple air nozzles. The method includes the following working process: the multiple air nozzles generate multiple air jets with different orientations, and at least a few air jets with different orientations intersect with the gas jets generated by the gas nozzles to form several flame-stabilizing vortices at different depths along the central axis of the burner body. Through this arrangement, the multiple air nozzles, with different inclination angles, generate air jets that interact with the gas jets generated by the gas nozzles to form multiple flame-stabilizing ignition points at different plane heights. This gives the flame-stabilizing burner a large gas regulation ratio, ensuring complete combustion even when the gas flow rate at the gas nozzles is low, resulting in good performance. Attached Figure Description

[0017] Figure 1 Schematic diagram of a flame stabilizer burner

[0018] Figure 2 This is a diagram showing the angle arrangement of the neutron gas nozzle and air nozzle in a flame stabilizer burner according to one embodiment.

[0019] Figure 3 for Figure 1 Schematic diagram of the AA section

[0020] Figure 4 for Figure 1 Schematic diagram of the CC section

[0021] Figure 5 Schematic diagram of the gas transmission section

[0022] Figure 6 Working principle diagram of flame stabilizer burner Detailed Implementation

[0023] The technical solution of the present invention is described below with reference to the accompanying drawings:

[0024] Example 1:

[0025] See Figures 1 to 6 The flame stabilizer of the present invention includes a burner body 1 and an igniter. The burner body 1 is provided with a gas nozzle and an air nozzle 31. Multiple air nozzles 31 are arranged circumferentially outside the gas nozzle. The multiple air nozzles 31 are oriented at different angles, for example, the multiple air nozzles 31 are arranged at irregular angles, so that the multiple air nozzles 31 can generate at least a few air jets that form different spatial angles with the central axis of the burner body 1. The air jets intersect with the gas jets generated by the gas nozzles to form multiple flame stabilizer vortices at different depths along the central axis of the burner body 1.

[0026] The air nozzle 31 of this application is used to spray a combustion-supporting gas jet, such as an oxygen jet or an air jet, etc. In actual use, it is not limited to an air jet alone.

[0027] Compared with the prior art, the flame stabilizer burner of the present invention has multiple air nozzles 31 oriented at different angles, and the resulting air jets form multiple flame stabilization ignition points at different plane heights with the gas jets generated by the gas nozzles. This gives the flame stabilizer burner a larger gas regulation ratio, ensuring complete combustion even when the gas flow rate at the gas nozzles is low, resulting in better performance. Compared with the regulation ratio of 1:5 of traditional burners, the flame stabilizer burner of this application can achieve 1:10.

[0028] The gas regulation ratio refers to the range within which the burner can still provide stable and continuous combustion when the flow rate parameter of the gas output is changed.

[0029] See Figures 1 to 4In one embodiment, the burner body 1 is provided with a gas passage 20 and an air passage 3. The air passage 3 is disposed outside the gas passage 20, preferably surrounding the outside of the gas passage 20. The gas nozzle is disposed at one end of the gas passage 20 along the gas outflow side, and the air nozzle 31 is disposed at one end of the air passage 3 along the gas outflow side. The gas nozzle includes a main gas nozzle 21 arranged along the central axis of the burner body 1 and sub-gas nozzles 22 arranged circumferentially outside the main gas nozzle 21. The sub-gas nozzles 22 are arranged in at least one ring around the outer periphery of the gas nozzle. The air nozzles 31 are located on the same circumferential line outside the gas nozzle, or the sub-gas nozzles 22 are discretely arranged inside and outside the same circumferential line outside the gas nozzle. The sub-gas nozzles 22 are arranged at slightly different angles toward the air nozzles 31, so that the gas jets generated by the sub-gas nozzles 22 and the air jets intersect to form multiple flame-stabilizing vortices at different depths along the central axis of the burner body 1. With this arrangement, the flame-stabilizing burner has more flame-stabilizing vortices in the radial plane along the axial direction, with a wider range and denser flame-stabilizing ignition points, higher flame adjustment ratio accuracy, better flame stabilization effect, and higher adjustment accuracy.

[0030] In one embodiment, the air nozzle 31 is provided in at least one ring around the outer periphery of the gas nozzle. When the air nozzle 31 is provided in multiple rings, it is not limited to equidistant or equally spaced arrangements. The air nozzles 31 are arranged on the same circumferential line on the outer periphery of the gas nozzle, or the air nozzles 31 are arranged discretely on the inner and outer sides of the same circumferential line on the outer periphery of the gas nozzle. With this arrangement, the flame stabilizer can generate more interlaced and dense flame stabilizing vortices, resulting in a better flame stabilization effect.

[0031] See Figures 2 to 6 In one embodiment, the burner body 1 has a gas delivery section 2 extending outward on one side along the delivery direction. The main gas nozzle 21 is located on the gas delivery section 2. The gas delivery section 2 has a ring of sub-gas nozzles 22 outside the main gas nozzle 21. The burner body 1 also has a ring of sub-gas nozzles 22 outside the gas delivery section 2. The gas passage 20 of the burner body 1 is connected to the main gas nozzle 21 and the sub-gas nozzles 22 respectively. With this arrangement, the characteristic function of the gas delivery section 2 is highlighted, and the influence of other airflows on the initial gas jet ejected from the main gas nozzle 21 is effectively reduced. This allows the main gas nozzle 21 to extend a certain distance before ejecting the gas jet mixed with the air jet, thus making the flame range generated by the burner body 1 longer.

[0032] See Figures 1 to 5In one embodiment, the burner body is further provided with a plurality of auxiliary mixed gas nozzles 4 located on its circumferential edge. The auxiliary mixed gas nozzles 4 are inclined in the same circumferential direction and are used to generate air jets or other combustion-supporting gas jets. The auxiliary mixed gas nozzles 4 can be different shapes such as circular, square or rectangular. By setting them in this way, the air jet of the outermost auxiliary mixed gas nozzle 4 has a certain circumferential tilting speed, forming a rotating flame flow with a certain swirling speed, thereby improving the mixing quality of air and fuel gas by strengthening or weakening the mixing.

[0033] In one embodiment, the air jet velocity is greater than the gas jet velocity, and the velocity ratio of the gas jet velocity to the air jet velocity is preferably 0.25 to 1. This configuration allows the higher-velocity air jet to have a stronger entrainment effect on the lower-velocity gas jet, promoting mixing in the flame-stabilizing vortex. Alternatively, in other embodiments, the air jet velocity is set to be less than the gas jet velocity.

[0034] In one embodiment, the inner diameter of the main gas nozzle 21 is larger than the inner diameter of the air nozzle 31; this arrangement ensures that the main gas nozzle 21 provides enough gas to mutually entrain and form multiple flame-stabilizing vortices with multiple air jets, resulting in a good flame-stabilizing effect.

[0035] In one embodiment, the spatial angle formed between the air jet and the central axis of the burner body 1 is less than 45°; by setting it in this way, the momentum of the air jet is mainly axial, so that the flame has a greater axial velocity and impulse, a greater flue gas entrainment capacity and airflow circulation ratio in the heating furnace, and lower nitrogen oxide emissions.

[0036] In one embodiment, at least one of the sub-gas nozzles 22 corresponds to two of the air nozzles 31, such that the gas jet generated by the sub-gas nozzle 22 is placed between the two air jets generated by the two air nozzles 31. The two staggered flame stabilizing vortices formed by the gas jet and the two air jets can be at the same height or have a relative height difference. With this arrangement, when two air jets sandwich a gas jet and meet at a certain spatial angle, the two high-speed air jets will "tear" the gas jet sandwiched in the middle in two directions until it breaks, merges, and completes the exchange of mass and momentum. During this process, the combustor nozzle plane to the confluence of the three jets, the staggered stage of the three jets, and the complex jets formed after the confluence will create multiple vortex structures with different directions, speeds, intensities, sizes, and compositions, and automatically generate the flame stabilization point and the initial combustion point.

[0037] The flame stabilizing burner provided in this application utilizes multiple artificially designed jets of different compositions and angles that intersect, rub, and shear each other to create numerous vortices and recirculation zones of varying sizes, velocities, intensities, directions, and compositions within a confined space. This forms three-dimensionally distributed flame stabilizing ignition points at different locations within the confined space. Although the spatial positions of these flame stabilizing ignition points may shift with changes in jet direction or velocity, the complex flow field formed by dozens of intersecting jets in various directions will still generate a new batch of stable ignition points, providing reliable combustion conditions for the stable combustion of the main flame. Adjusting the angle, intersection point, jet velocity, and nozzle position of the gas and air jets can create different flow field distributions, mixing effects, and ignition positions, thereby altering flame characteristics. This novel flame stabilization method is practical and effective, featuring a simple structure, low pressure loss, high flame velocity, a wide flame stability range, and a large adjustment ratio allowing for oxygen-rich or oxygen-deficient combustion. Furthermore, due to the increased axial jet velocity and enhanced flue gas recirculation, nitrogen oxide emissions are significantly reduced.

[0038] Example 2:

[0039] See Figures 1 to 6 The flame stabilization method of the present invention relates to a flame stabilization burner, wherein the flame stabilization burner is provided with at least one gas nozzle and multiple air nozzles 31, and the method includes the following working process: multiple air nozzles 31 generate multiple air jets with different orientations, and at least a few air jets with different orientations intersect with the gas jets generated by the gas nozzles to form a number of flame stabilization vortices with different depths along the central axis of the burner body 1.

[0040] Compared with the prior art, the flame stabilization method of the present invention has multiple air nozzles 31 facing at different angles, and the air jets generated therefrom form multiple flame stabilization ignition points at different plane heights with the gas jets generated by the gas nozzles. This gives the flame stabilization burner a larger gas regulation ratio, and even when the gas flow rate of the gas nozzles is small, the gas can still be fully combusted, resulting in good performance.

[0041] The specific structural form of the flame stabilization method in this embodiment can be realized through the structure of the flame stabilization burner in Embodiment 1.

[0042] Alternatively, in one embodiment, multiple gas nozzles and multiple air nozzles 31 are provided, and the multiple gas nozzles and multiple air nozzles 31 are arranged on the flame stabilizer, or they can be arranged on the flame stabilizer in a discrete or irregular manner.

[0043] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A pilot burner, characterized by The burner body is provided with a gas jet and a plurality of air jets arranged circumferentially outside the gas jet; the air jets are arranged at different angles to generate air jets at different angles with the central axis of the burner body, and the air jets and the gas jet generated by the gas jet are staggered to form stable flame vortices at different depths along the central axis of the burner body. The gas jet includes a main gas jet arranged along the central axis of the burner body. The gas jet also includes a sub-gas jet arranged circumferentially outside the main gas jet, which is arranged at different angles to the air jet to generate gas jets that are staggered with the air jets to form stable flame vortices at different depths along the central axis of the burner body. At least one sub-gas jet corresponds to two air jets, so that the gas jet generated by the sub-gas jet is placed between the two air jets. The burner body is provided with a gas delivery part extending outward on one side along the delivery direction, and the main gas jet is arranged on the gas delivery part.

2. The stable flame burner of claim 1, wherein The air jet is arranged at least once along the outer periphery of the gas jet; the air jet is arranged circumferentially on the same circumferential line inside and outside.

3. The stable flame burner of claim 1, wherein It also includes a plurality of auxiliary mixed gas jets arranged circumferentially on the edge of the burner body, which are inclined in the same circumferential direction.

4. The stable flame burner according to any one of claims 1 to 3, characterized in that, The flow rate of the air jet is greater than that of the gas jet.

5. The stable flame burner of claim 4, wherein The gas jet includes a main gas jet arranged along the central axis of the burner body, and the inner diameter of the main gas jet is greater than that of the air jet.

6. The stable flame burner according to any one of claims 1 to 3, characterized in that The spatial angle of the air jet with the central axis of the burner body is less than 45°.

7. A method of stabilizing a flame, involving a flame stabilizing burner according to any one of claims 1 to 6, said flame stabilizing burner being provided with at least one gas jet and a plurality of air jets, characterized in that, The method includes the following working processes: a plurality of air jets generate a plurality of air jets at different angles, and at least a plurality of air jets at different angles are staggered with the gas jet generated by the gas jet to form a plurality of stable flame vortices at different depths along the central axis of the burner body.

Images