Low-nitrogen flat flame burner

Abstract

The utility model provides a low-nitrogen flat flame burner, which belongs to the technical field of kiln burners, and comprises a main body, a gas pipe and a baffle ring, the main body is fixedly arranged on a kiln; a first cavity, a second cavity and a ventilation cavity channel communicated with the first cavity and the second cavity are formed in the main body; the gas pipe is coaxially arranged in the ventilation cavity channel; the gas pipe is provided with a connecting end and a gas outlet end, and the connecting end penetrates through the main body and extends out to be communicated with gas conveying equipment; the air outlet end is communicated with the second chamber; the baffle ring is arranged in the ventilation cavity channel and is coaxially and fixedly connected with the gas pipe; and in the direction from the first cavity to the second cavity, the outer diameter of the baffle ring is gradually increased, so that air passing through the ventilation cavity channel is spread back to the central axis of the gas pipe. According to the low-nitrogen flat flame burner provided by the invention, the baffle ring can prevent air from directly impacting the gas pipe, so that the air can be more uniformly distributed around a burning area, the stability of the root of flame is influenced, the blow-off phenomenon is reduced, and the service life of the burner is prolonged.

Description

Low-NOx flat flame burner Technical Field

[0001] This utility model belongs to the field of kiln burner technology, and more specifically, relates to a low-NOx flat flame burner. Background Technology

[0002] A flat flame burner is a combustion device that can expand a flame into a thin, disc-shaped flame. It is widely used in industrial heating processes such as metal heat treatment and glass melting.

[0003] Currently, flat flame burners mainly consist of three parts: a gas nozzle, an air distributor, and a combustion chamber. The gas nozzle is responsible for injecting gas into the combustion chamber; the air distributor evenly distributes air into the combustion chamber, ensuring thorough mixing with the gas to form a combustible mixture. Finally, when this mixture encounters an ignition source, it is ignited, and combustion begins.

[0004] The inventors discovered that in the use of existing flat flame burners, the airflow is prone to blowing away the gas directly. This phenomenon affects the stability of the flame root, easily causing flameout, which leads to the gas burning up along the outer wall of the gas pipe, causing flat flame burner malfunctions and component burnout, and reducing the service life of the flat flame burner. Summary of the Invention

[0005] The purpose of this application is to provide a low-NOx flat flame burner to solve the technical problem that in the prior art, when flat flame burners are used, the airflow can easily blow away the gas, resulting in an unstable flame root.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A low-NOx flat flame burner is provided, comprising:

[0008] The main body is used to be fixedly installed on a kiln; the main body has a first chamber, a second chamber, and a ventilation channel communicating with the first chamber and the second chamber; wherein, the main body is provided with an air inlet communicating with the first chamber and an exhaust port communicating with the second chamber;

[0009] A gas pipe is coaxially disposed within the ventilation cavity; the gas pipe has a connecting end and a gas outlet end, the connecting end penetrating the main body and extending outwards for connecting to a gas delivery device; the gas outlet end communicates with the second chamber; and

[0010] A retaining ring is disposed within the ventilation cavity and is coaxially and fixedly connected to the gas pipe; in the direction from the first chamber to the second chamber, the outer diameter of the retaining ring gradually increases so that the air passing through the ventilation cavity propagates away from the central axis of the gas pipe.

[0011] In one possible implementation, the low-NOx flat flame burner further includes:

[0012] A cyclone separator is installed at the connection between the first chamber and the ventilation channel to increase the propagation speed of the air entering the ventilation channel and change the direction of air propagation to form a rotating jet.

[0013] In one possible implementation, the cyclone separator includes:

[0014] A cylindrical body is fixedly disposed within the first chamber and surrounds and communicates with the ventilation channel; the cylindrical body has a plurality of air holes spaced apart along its circumference; the axis of each air hole is inclined relative to a radial line on the cylindrical body, and each air hole is inclined at the same angle in the same direction; and

[0015] A pressure plate is fixedly installed on the side of the cylinder facing away from the ventilation cavity to seal the cylinder.

[0016] The pressure plate has a reserved hole suitable for the gas pipe to pass through.

[0017] In one possible implementation, the subject includes:

[0018] Burner bricks, used for fixed installation on the kiln, have a hollow internal structure to form the second chamber, and the ventilation channels and exhaust ports are respectively located at both ends of the second chamber; and

[0019] An air distribution component is fixedly installed on the side of the burner brick facing away from the kiln, and has an internally hollow structure to form the first chamber; and the air inlet is located on the air distribution component.

[0020] In one possible implementation, the ventilation channel adopts a straight cylindrical structure.

[0021] In one possible implementation, the inner diameter of the second chamber gradually increases in the direction of the ventilation channel toward the exhaust port.

[0022] In one possible implementation, the inner circumferential surface of the second chamber is an inclined surface, and the inner circumferential surface of the exhaust port is an arc surface.

[0023] In one possible implementation, a heat-insulating material layer is provided on the inner peripheral wall of the first chamber.

[0024] In one possible implementation, the gas outlet is connected to a nozzle, the nozzle having a plurality of nozzle holes spaced apart circumferentially along the gas pipe;

[0025] Each of the nozzles is connected to the interior of the nozzle and is positioned facing the outer periphery of the gas pipe.

[0026] In one possible implementation, the nozzle is adapted to be fitted onto the air outlet end, and an internal thread groove is provided on the inner circumferential surface of the nozzle; the outer circumferential wall of the air outlet end has an external thread structure adapted to the internal thread groove, so as to enable the air outlet end to be threadedly connected to the nozzle.

[0027] In this embodiment, when the low-NOx flat flame burner is working, air enters the first chamber from the air inlet on the main body, which is connected to the first chamber, and then passes through the ventilation channel. In the ventilation channel, as the outer diameter of the baffle ring gradually increases in the direction from the first chamber to the second chamber, the air is guided to propagate away from the central axis of the gas pipe. At the same time, the gas enters from the gas pipe connection end, which is connected to the gas delivery equipment. The gas is delivered to the outlet end through the gas pipe and enters the second chamber. In the second chamber, the air propagating away from the central axis of the gas pipe is fully mixed with the gas. The mixed gas is discharged from the exhaust port connected to the second chamber and burned.

[0028] Compared with the prior art, the low-NOx flat flame burner provided in this application embodiment can prevent air from directly impacting the gas pipe, allowing air to be more evenly distributed around the combustion area, thereby affecting the stability of the flame root, reducing flameout, and improving the burner's lifespan. In addition, the baffle ring can effectively prevent the risk of gas burning up along the outer wall of the gas pipe, greatly reducing malfunctions and component burnout, and improving the burner's service life. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a three-dimensional structural schematic diagram of the low-NOx flat flame burner provided in an embodiment of this application;

[0031] Figure 2 is a front view of the low-NOx flat flame burner provided in an embodiment of this application;

[0032] Figure 3 is a schematic cross-sectional view along line AA in Figure 2;

[0033] Figure 4 is a three-dimensional structural diagram of the gas outlet end of the gas pipe used in the embodiment of this application;

[0034] Figure 5 is a three-dimensional structural diagram of the hydrocyclone used in the embodiments of this application;

[0035] Figure 6 is a schematic cross-sectional view of the hydrocyclone shown in Figure 5.

[0036] The following are the labeling elements in the figure:

[0037] 1. Main body; 11. Burner brick; 12. Air distribution unit; 13. Air inlet; 14. Exhaust port; 2. Combustion pipe; 21. Connecting end; 22. Air outlet end; 221. Nozzle; 222. Nozzle hole; 3. Baffle ring; 4. Swirl generator; 41. Cylinder; 411. Air hole; 42. Pressure plate; 5. First chamber; 51. Insulation material layer; 6. Second chamber; 7. Ventilation channel. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0039] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] Please refer to Figures 1 to 6 together. The low-NOx flat flame burner provided in this application will now be described. The low-NOx flat flame burner includes a main body 1, a gas pipe, and a baffle ring 3.

[0043] The main body 1 is used to be fixedly installed on the kiln; the main body 1 has a first chamber 5, a second chamber 6, and a ventilation channel 7 communicating with the first chamber 5 and the second chamber 6; wherein, the main body 1 is provided with an air inlet 13 communicating with the first chamber 5 and an exhaust port 14 communicating with the second chamber 6.

[0044] A gas pipe is coaxially arranged within the ventilation cavity 7; the gas pipe has a connecting end 21 and an outlet end 22, the connecting end 21 penetrating the main body 1 and extending outwards for connecting to gas transmission equipment; the outlet end 22 communicates with the second chamber 6; and

[0045] The baffle ring 3 is installed inside the ventilation channel 7 and is fixedly connected to the gas pipe coaxially. In the direction from the first chamber 5 to the second chamber 6, the outer diameter of the baffle ring 3 gradually increases so that the air passing through the ventilation channel 7 propagates away from the central axis of the gas pipe.

[0046] In this embodiment, when the low-NOx flat flame burner is working, air enters the first chamber 5 from the air inlet 13 on the main body 1, which is connected to the first chamber 5, and then passes through the ventilation channel 7. In the ventilation channel 7, as the outer diameter of the baffle ring 3 gradually increases in the direction from the first chamber 5 toward the second chamber 6, the air is guided to propagate away from the central axis of the gas pipe. At the same time, the gas enters from the gas pipe connection end 21, which is connected to the gas delivery equipment. The gas is delivered to the outlet end 22 via the gas pipe and enters the second chamber 6. In the second chamber 6, the air propagating away from the central axis of the gas pipe is fully mixed with the gas. The mixed gas is discharged from the exhaust port 14, which is connected to the second chamber 6, and then burned.

[0047] Compared with the prior art, the low-NOx flat flame burner provided in this application embodiment can prevent air from directly impacting the gas pipe, allowing air to be more evenly distributed around the combustion area, thereby affecting the stability of the flame root, reducing flameout, and improving the burner's lifespan. In addition, the baffle ring 3 can effectively prevent the risk of gas burning up along the outer wall of the gas pipe, greatly reducing malfunctions and component burnout, and improving the burner's service life.

[0048] In some embodiments, the above-mentioned low-NOx flat flame burner can adopt the structure shown in Figures 3, 5 and 6. Referring to Figures 3, 5 and 6, the low-NOx flat flame burner also includes a swirler 4.

[0049] The cyclone separator 4 is located at the connection between the first chamber 5 and the ventilation channel 7 to increase the propagation speed of the air entering the ventilation channel 7 and change the direction of air propagation to form a rotating jet.

[0050] By setting the swirler 4, the above structure can cooperate with the main body 1, the gas pipe and the baffle ring 3 to further optimize the air flow state, thereby achieving the technical effect of more complete air-gas mixing and more stable combustion, and solving the technical problem of insufficient air-gas mixing.

[0051] In some embodiments, the hydrocyclone 4 may adopt the structure shown in Figures 3, 5 and 6. Referring to Figures 3, 5 and 6, the hydrocyclone 4 includes a cylinder 41 and a pressure plate 42.

[0052] The cylinder 41 is fixedly installed in the first chamber 5 and is arranged around the ventilation channel 7 and communicates with the ventilation channel 7; the cylinder 41 has a plurality of air holes 411 arranged at intervals along its circumference; the axis of each air hole 411 is inclined relative to a radial line on the cylinder 41, and each air hole 411 is inclined at the same angle in the same direction.

[0053] The pressure plate 42 is fixedly installed on the side of the cylinder 41 facing away from the ventilation cavity 7 to seal the cylinder 41.

[0054] The pressure plate 42 has a reserved hole suitable for the gas pipe to pass through.

[0055] Air enters the ventilation chamber 7 through the inclined air hole 411 on the cylinder 41. Since the axis of the air hole 411 is inclined relative to the diameter of the cylinder 41 and tilted at the same angle in the same direction, the air forms a rotating jet. The pressure plate 42 closes the cylinder 41, and the gas pipe passes through the reserved hole on the pressure plate 42. There is a sealing gasket between the gas pipe and the reserved hole to seal the gap between them.

[0056] By setting up a vortex generator 4 consisting of a cylinder 41 and a pressure plate 42, the above structure can cooperate with other components to achieve the purpose of precisely controlling the rotating air jet, thereby achieving the technical effect of improving the mixing effect of air and gas and enhancing combustion performance, and solving the technical problem of the difficulty in precisely controlling the rotating air jet.

[0057] In some embodiments, the main body 1 may adopt the structure shown in Figures 1 to 3. Referring to Figures 1 to 3, the main body 1 includes a burner brick 11 and an air distribution component 12.

[0058] The burner brick 11 is used to be fixedly installed on the kiln and has a hollow internal structure to form the second chamber 6, as well as the ventilation channel 7 and exhaust port 14 located at both ends of the second chamber 6 respectively; the burner brick 11 is cast integrally, and during casting, the connection between the ventilation channel and the exhaust port 14 adopts a tangential and smooth transition.

[0059] The air distribution component 12 is fixedly installed on the side of the burner brick 11 facing away from the kiln, and adopts an internal hollow structure to form the first chamber 5; and the air inlet 13 is installed on the air distribution component 12; the air distribution body can be fixed to the burner brick 11 with bolts to provide combustion air for the combustion of gas; the air inlet 13 is installed on the air distribution component 12 to realize the delivery and mixing of air and gas.

[0060] By setting burner bricks 11 and air distribution components 12 to form the main body 1, the above structure can reasonably arrange the chambers and channels, achieving the purpose of stable installation and efficient delivery of air and gas, thereby improving the overall stability and working efficiency of the burner and solving the technical problems of unstable burner installation and low delivery efficiency.

[0061] In some embodiments, the ventilation channel 7 can adopt the structure shown in FIG3. Referring to FIG3, the ventilation channel 7 adopts a straight cylindrical structure.

[0062] The straight-cylindrical ventilation channel 7 provides a smooth airflow path and reduces airflow resistance. By setting the straight-cylindrical ventilation channel 7, the above structure can cooperate with other components to achieve the purpose of stable airflow, thereby achieving the technical effects of reducing airflow energy consumption and ensuring air delivery stability, and solving the technical problem of poor airflow in the ventilation channel 7.

[0063] In some embodiments, the second chamber 6 may adopt the structure shown in FIG3. Referring to FIG3, the inner diameter of the second chamber 6 gradually increases in the direction of the ventilation channel 7 toward the exhaust port 14, so that the air and fuel gas can be further mixed in the expanded space.

[0064] By setting up a second chamber 6 with a gradually increasing inner diameter, the above structure can cooperate with other components to achieve the purpose of fully mixing and uniformly diffusing air and gas, thereby achieving the technical effect of more complete combustion and more uniform flame coverage, and solving the technical problem of uneven diffusion after mixing air and gas.

[0065] In some embodiments, the second chamber 6 can adopt the structure shown in FIG3. Referring to FIG3, the inner circumferential surface of the second chamber 6 is a slope, and the inner circumferential surface of the exhaust port 14 is an arc surface. This special shape design helps to guide the flow direction of air and gas, so that the mixed gas can be discharged more smoothly.

[0066] By setting the inner circumferential surface of the inclined second chamber 6 and the inner circumferential surface of the arc-shaped exhaust port 14, the above structure can cooperate with other components to achieve the purpose of optimizing the flow path of the mixed gas, thereby achieving the technical effect of reducing flow resistance and improving combustion efficiency, and solving the technical problem of high resistance when the mixed gas is discharged.

[0067] In some embodiments, the first chamber 5 can adopt the structure shown in FIG3. Referring to FIG3, a heat insulation material layer 51 is provided on the inner peripheral wall of the first chamber 5 to block the transmission of high temperature air to the outside.

[0068] By setting the heat insulation material layer 51, the above structure can work with other components to reduce the outward transfer of heat, thereby avoiding the impact of excessively high temperatures on the external environment and operators.

[0069] In some embodiments, the gas outlet 22 may adopt the structure shown in FIG3 and FIG4. Referring to FIG3 and FIG4, the gas outlet 22 is connected to a nozzle 221, and the nozzle 221 has a plurality of nozzle holes 222 spaced apart along the circumference of the gas pipe.

[0070] Each nozzle 222 is connected to the inside of the nozzle 221 and is positioned facing the outer periphery of the gas pipe.

[0071] Gas enters the nozzle 221 from the gas outlet 22 of the gas pipe and is ejected through multiple nozzles 222 spaced along the circumference of the gas pipe on the nozzle 221, so that the gas is more evenly distributed in the second chamber 6. By setting the nozzle 221 with multiple nozzles 222, the above structure can cooperate with other components to achieve the purpose of uniform gas injection, thereby achieving the technical effect of better mixing of gas and air and improving combustion effect, and solving the technical problem of uneven gas injection.

[0072] In some embodiments, the nozzle 221 may adopt the structure shown in FIG3 and FIG4. Referring to FIG3 and FIG4, the nozzle 221 is adapted to be sleeved on the air outlet end 22, and the inner circumferential surface of the nozzle 221 is provided with an internal thread groove; the outer circumferential wall of the air outlet end 22 has an external thread structure adapted to the internal thread groove, so as to facilitate the threaded connection between the air outlet end 22 and the nozzle 221.

[0073] The internal threaded groove on the inner circumferential surface of the nozzle 221 is adapted to the external threaded structure on the outer circumferential wall of the air outlet 22, so that the nozzle 221 is threadedly connected to the air outlet 22, thereby achieving the fixed installation of the nozzle 221. By setting the threaded connection between the nozzle 221 and the air outlet 22, the above structure can facilitate the installation and disassembly of the nozzle 221, and achieve the purpose of facilitating the maintenance and replacement of the nozzle 221. This achieves the technical effect of improving the convenience of equipment maintenance and reducing maintenance costs, and solves the technical problem of difficult installation and disassembly of the nozzle 221.

[0074] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A low-NOx flat flame burner, characterized in that, include: A main body (1) is used to be fixedly installed on a kiln; the main body (1) has a first chamber (5), a second chamber (6), and a ventilation channel (7) communicating with the first chamber (5) and the second chamber (6); wherein, the main body (1) is provided with an air inlet (13) communicating with the first chamber (5) and an exhaust port (14) communicating with the second chamber (6); a gas pipe is coaxially arranged in the ventilation channel (7); the gas pipe has a connecting end (21) and a connecting end (21). The outlet (22) extends through the main body (1) and extends outward to connect to the gas transmission equipment; the outlet (22) is connected to the second chamber (6); and a retaining ring (3) is disposed in the ventilation channel (7) and is coaxially fixedly connected to the gas pipe; in the direction from the first chamber (5) to the second chamber (6), the outer diameter of the retaining ring (3) gradually increases so that the air passing through the ventilation channel (7) propagates away from the central axis of the gas pipe.

2. The low-NOx flat-flame burner as described in claim 1, characterized in that, The low-NOx flat flame burner also includes a swirler (4), which is disposed at the connection between the first chamber (5) and the ventilation channel (7) to increase the air propagation speed entering the ventilation channel (7) and change the air propagation direction to form a rotating jet.

3. The low-NOx flat flame burner as described in claim 2, characterized in that, The cyclone separator (4) includes: a cylindrical body (41), which is fixedly disposed in the first chamber (5) and surrounds the ventilation channel (7) and communicates with the ventilation channel (7); the cylindrical body (41) has a plurality of air holes (411) spaced apart along its circumference; the axis of each air hole (411) is inclined relative to a radial line on the cylindrical body (41), and each air hole (411) is inclined at the same angle in the same direction; and a pressure plate (42), which is fixedly disposed on the side of the cylindrical body (41) facing away from the ventilation channel (7) to close the cylindrical body (41); wherein the pressure plate (42) has a reserved hole suitable for the gas pipe to pass through.

4. The low-NOx flat flame burner as described in claim 1, characterized in that, The main body (1) includes: a burner brick (11) for fixed installation on the kiln, and having an internally hollow structure to form the second chamber (6); and the ventilation channel (7) and the exhaust port (14) located at both ends of the second chamber (6); and an air distribution component (12) fixedly disposed on the side of the burner brick (11) facing away from the kiln, having an internally hollow structure to form the first chamber (5); and the air inlet (13) disposed on the air distribution component (12).

5. The low-NOx flat-flame burner as described in claim 1 or 4, characterized in that, The ventilation cavity (7) adopts a straight cylindrical structure.

6. The low-NOx flat-flame burner as described in claim 1 or 4, characterized in that, In the direction of the ventilation channel (7) toward the exhaust port (14), the inner diameter of the second chamber (6) gradually increases.

7. The low-NOx flat-flame burner as described in claim 6, characterized in that, The inner circumferential surface of the second chamber (6) is an inclined surface, and the inner circumferential surface of the exhaust port (14) is an arc surface.

8. The low-NOx flat flame burner as described in claim 1 or 4, characterized in that, The inner peripheral wall of the first chamber (5) is provided with a heat insulation material layer (51).

9. The low-NOx flat flame burner as described in claim 1, characterized in that, The gas outlet (22) is connected to a nozzle (221), and the nozzle (221) has a plurality of nozzle holes (222) spaced apart along the circumference of the gas pipe; wherein each nozzle hole (222) is connected to the interior of the nozzle (221) and is arranged facing the outer periphery of the gas pipe.

10. The low-NOx flat-flame burner as described in claim 9, characterized in that, The nozzle (221) is adapted to be fitted onto the air outlet (22), and an internal thread groove is provided on the inner circumferential surface of the nozzle (221); the outer circumferential wall of the air outlet (22) has an external thread structure that is adapted to the internal thread groove, so as to make the air outlet (22) and the nozzle (221) threadedly connected.

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