Ultralow nitrogen oxide burner

Abstract

The utility model relates to the technical field of combustors, in particular to an ultra-low nitrogen oxide combustor which comprises a shell, a central gas outer pipe is arranged in the middle of the left end face of the shell, a central gas pipe is arranged at the tail end of the shell, a peripheral gas pipeline is arranged on the left end face of the shell and close to the edge, and a gas ring cavity is formed in the end, close to the right central gas outer pipe, of the interior of the shell. A fuel gas injection mechanism is arranged at the right end of the shell and comprises a peripheral air ring pipe and a plurality of injection ring pipes arranged on the outer wall of the peripheral air ring pipe, a flow uniformizing cover is further arranged in the shell, and a plurality of peripheral fuel gas branch pipes connected with the injection ring pipes are further arranged on the inner wall of the shell. According to the ultra-low nitrogen oxide burner, the gas ring cavity and the center gas pipe are arranged, under the cooperation of the contraction type flow guide cover and the adjustable flow guide plate, the center adjusting rod adjusts the size and the position of center flame, peripheral gas is injected through the peripheral air ring pipe and the center gas outer pipe, the average heat value of the gas is reduced, and low-pollution emission of burning is achieved.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically to an ultra-low nitrogen oxide burner. Background Technology

[0002] NOx and CO are important air pollutants and are major factors that cause acid rain and smog. The burner releases heat by mixing fuel gas and combustion air and organizing combustion, minimizing the generation of local high-temperature zones, and ensuring uniform mixing of fuel gas and combustion air, thereby suppressing the generation of NOx and CO during combustion and reducing NOx and CO emissions.

[0003] Utility model publication CN220771108U discloses a top-fired ultra-low NOx burner for hydrogen production, comprising a burner body, an air fan, and a recovery and circulation assembly. The burner body is internally fixedly connected to a first partition and a second partition, which divide the interior of the burner body into a first mixing chamber, a second mixing chamber, and an ignition chamber, respectively. In this utility model;

[0004] The above-mentioned technical solution, through a recycling and circulation assembly consisting of a recycling ring, annular groove, recycling pipe, and a small circulating fan, can recycle and utilize combustion flue gas, reducing resource waste. Furthermore, the large heat capacity of the combustion flue gas lowers the combustion temperature, further reducing the generation of nitrogen oxides. However, since the fuel gas ejected from the fuel gun is premixed with the combustion air before entering the combustion zone, the burner structure is sensitive to fluctuations in fuel pressure, which can easily cause backfire and deflagration, leading to instability during burner operation and increasing the generation of NOx and CO. Utility Model Content

[0005] The purpose of this invention is to provide an ultra-low nitrogen oxide burner to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An ultra-low nitrogen oxide burner includes a housing. A central gas outer pipe is located at the middle of the left end face of the housing. One end of the central gas outer pipe extends into the interior of the housing and is connected to a central gas pipe at its end. A peripheral gas pipe is located near the edge of the left end face of the housing. The fuel gas is divided into central gas and peripheral gas. A gas ring cavity is located inside the housing near the right end of the central gas outer pipe. A gas ejector mechanism is located at the right end of the housing. The gas ejector mechanism includes a peripheral air ring pipe and several ejector ring pipes on the outer wall of the peripheral air ring pipe. The central gas pipe extends into the peripheral air ring pipe and is connected to a central air ring pipe at its end. A flow equalization shroud is also located inside the housing. Several peripheral gas branch pipes connected to the ejector ring pipes are also located on the inner wall of the housing.

[0008] Preferably, flame detectors are symmetrically provided on the left end face of the outer casing, the detection end of the flame detectors extends into the interior of the outer casing, and a fire observation window is also provided on the left end face of the outer casing.

[0009] In this invention, the cooperation of two flame detectors helps to detect the flame inside the casing in real time, and with the help of the observation window, it combines flameout protection and flame pattern observation during use.

[0010] Preferably, the bottom of the outer casing has a plurality of combustion air passages that are interconnected with the interior space of the outer casing, and the interior space of the combustion air passages is interconnected with the interior space of the outer casing.

[0011] In this invention, the provision of a combustion air channel helps to continuously introduce combustion air into the interior, and with the cooperation of the flow equalization shroud, it enables the central combustion air to mix with the peripheral combustion air.

[0012] Preferably, the central gas enters the central gas pipe through the central gas outer pipe, and then enters the central air ring pipe from the end of the central gas pipe. Several jet holes are also provided on the outer wall of the end of the central gas pipe, through which the central gas enters the central air ring pipe. Several swirl blades are also provided between the central air ring pipe and the central gas pipe.

[0013] In this invention, the central gas outer pipe and the central gas pipe work together to continuously deliver gas to the central position. With the help of the jet hole, the gas is dispersed in the central air ring pipe. With the help of multiple swirl blades, the gas is stably and evenly discharged. With the help of the igniter, the gas is ignited to form a central flame. The swirl angle of the swirl blades is 30-60 degrees and the number of blades is 8-12.

[0014] Preferably, the external gas enters the gas ring cavity through the external gas pipeline, then connects to the gas ejector mechanism through the external gas branch pipe, and enters the ejector ring pipe.

[0015] In this invention, the external gas enters the external gas branch pipe through the external gas pipeline and is ejected from the corresponding ejector ring pipe to form a combustion air and flue gas mixture ejected from the burner, wherein the number of ejector ring pipes is 6-12.

[0016] Preferably, the external combustion gas enters the burner chamber through the external combustion gas pipeline. After being uniformly circulated by the flow equalization shroud, it is divided into two parts: central combustion air and external combustion air. The central combustion air is mixed with the central combustion gas from the radial jet orifice through the central air ring pipe.

[0017] In this invention, with the help of the flow equalization shroud, the combustion air entering the interior through the combustion air channel is evenly dispersed and mixed with the central combustion gas with the help of the jet holes, which helps to fully ignite the combustion gas.

[0018] Preferably, an igniter is also provided inside the outer casing near the central gas pipe, and a central adjusting rod is also provided on the side of the central gas pipe.

[0019] In this invention, the igniter helps to ignite the mixed gas. The central adjustment rod helps to adjust the overall axial displacement of the radial jet holes and swirl blades, thereby adjusting the size and position of the central flame. The number of jet holes is 6-12, and the diameter is 15-32mm, which helps to fully guide the flow.

[0020] Preferably, a shrinkable flow guide is provided between the outer air ring pipe and the outer shell at the central gas pipe, and an adjustable flow guide plate is provided at the inner edge of the shrinkable flow guide plate, and an ejector ring slit is provided between the adjustable flow guide plate and the central air ring pipe.

[0021] In this invention, a shrinkable guide hood and an adjustable guide plate are combined. The shrinkage angle of the shrinkable guide hood is 15-45 degrees to achieve adjustable flow rate. The adjustable guide plate adjusts the height of the ejector ring slit according to the different burner power. The height of the ejector ring slit is 25-45mm, thereby achieving the flue gas ejection effect.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. This utility model sets up a gas ring cavity and a central gas pipe, and with the cooperation of a shrinkable guide shroud and an adjustable guide plate, the central adjustment rod adjusts the size and position of the central flame, and the gas is independently divided into two stages, reducing the sensitivity to fuel mixing and pressure. The peripheral gas is injected through the peripheral air ring pipe and the central gas outer pipe, reducing the average calorific value of the gas, reducing the high-temperature zone in the burner flame, and achieving low-pollution emissions from combustion.

[0024] 2. This utility model, by setting an ejector ring pipe in conjunction with an external gas branch pipe, allows combustion air to be ejected to the flue gas, reducing the oxygen content in the combustion aid, avoiding local high temperatures, and achieving low nitrogen oxide emissions during combustion. The flame detector, in conjunction with the observation window, enables flameout protection and flame pattern observation during use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a side view of the entire utility model;

[0027] Figure 3 This is a schematic diagram of the overall rear view of the present invention;

[0028] Figure 4 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0029] The meanings of the labels in the diagram are as follows:

[0030] 1. Outer casing; 10. Observation window; 11. Flame detector; 12. Combustion air passage; 13. Central adjustment rod; 14. Flow equalizer; 15. Converging flow guide; 150. Adjustable flow guide plate; 16. Injector ring seam; 17. Peripheral gas branch pipe; 18. Ignition device;

[0031] 2. Central gas outer pipe; 20. Central gas pipe; 21. Jet orifice; 22. Swirl vane; 23. Central air ring pipe;

[0032] 3. External gas pipelines;

[0033] 4. External air ring pipe;

[0034] 5. Ejector ring tube;

[0035] 6. Gas annular cavity. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Please see Figures 1-4 This embodiment provides the following technical solution:

[0038] The ultra-low nitrogen oxide burner includes a housing 1, and flame detectors 11 are symmetrically arranged on the left end face of the housing 1. The detection end of the flame detectors 11 extends into the interior of the housing 1, and a viewing window 10 is also provided on the left end face of the housing 1.

[0039] In this invention, the cooperation of two flame detectors 11 helps to detect the flame inside the outer casing 1 in real time, and with the cooperation of the observation window 10, it combines flameout protection and flame pattern observation during use.

[0040] Furthermore, the bottom of the outer shell 1 has several combustion air channels 12 that are connected to the interior of the outer shell 1, and the interior space of the combustion air channels 12 is connected to the interior space of the outer shell 1.

[0041] In this invention, the combustion air channel 12 helps to continuously introduce combustion air into the interior, and with the cooperation of the flow equalizer 14, the central combustion air and the peripheral combustion air are mixed.

[0042] Specifically, a central gas pipe 2 is provided at the middle of the left end face of the outer casing 1. One end of the central gas pipe 2 extends into the interior of the outer casing 1, and a central gas pipe 20 is provided at the end. An igniter 18 is also provided inside the outer casing 1 near the central gas pipe 20, and a central adjusting rod 13 is also provided on one side of the central gas pipe 20.

[0043] In this invention, the igniter 18 helps to ignite the mixed gas. The central adjustment rod 13 helps to adjust the overall axial displacement of the radial jet holes 21 and the swirl blades 22, thereby adjusting the size and position of the central flame. The number of jet holes 21 is 6-12, and the diameter is 15-32mm, which helps to fully guide the flow.

[0044] It should be noted that an outer gas pipe 3 is provided near the edge on the left end face of the outer casing 1. The fuel gas is divided into two parts: central gas and outer gas. A gas ring cavity 6 is provided inside the outer casing 1 near the right end of the central gas outer pipe 2. A gas ejector mechanism is provided at the right end of the outer casing 1. The gas ejector mechanism includes an outer air ring pipe 4 and several ejector ring pipes 5 on the outer wall of the outer air ring pipe 4. The central gas pipe 20 extends into the outer air ring pipe 4, and a central air ring pipe 23 is provided at the end of the central gas pipe 20. The central gas enters the central gas pipe 20 through the central gas outer pipe 2 and enters the central air ring pipe 23 from the end of the central gas pipe 20. Several jet holes 21 are also provided on the outer wall of the end of the central gas pipe 20. The central gas enters the central air ring pipe 23 through the jet holes 21. Several swirl vanes 22 are also provided between the central air ring pipe 23 and the central gas pipe 20.

[0045] In this invention, the central gas outer pipe 2 and the central gas pipe 20 work together to continuously deliver gas to the central position. With the help of the jet hole 21, the gas is dispersed in the central air ring pipe 23. With the help of multiple swirl blades 22, the gas is stably and evenly discharged. With the help of the igniter 18, the gas is ignited to form a central flame. The swirl angle of the swirl blades 22 is 30-60 degrees, and the number of blades is 8-12.

[0046] Furthermore, the outer casing 1 is also provided with a flow equalization shroud 14, and the inner wall of the outer casing 1 is also provided with several peripheral gas branch pipes 17 connected to the ejector ring pipe 5.

[0047] The external gas enters the gas ring cavity 6 through the external gas pipeline 3, then connects to the gas ejector mechanism through the external gas branch pipe 17, and enters the ejector ring pipe 5.

[0048] In this invention, the external gas enters the external gas branch pipe 17 through the external gas pipeline 3 and is ejected from the corresponding ejector ring pipe 5 to form a combustion air and flue gas mixed ejector burner, wherein the number of ejector ring pipes 5 is 6-12.

[0049] Specifically, the external combustion gas enters the burner chamber through the external combustion gas pipeline 3. After being uniformly circulated by the flow equalization shroud 14, it is divided into two parts: central combustion air and external combustion air. The central combustion air is mixed with the central combustion gas from the radial jet hole 21 through the central air ring pipe 23.

[0050] In this invention, with the cooperation of the uniform flow shroud 14, the combustion air entering the interior through the combustion air channel 12 is evenly dispersed and mixed, and with the cooperation of the jet hole 21, it mixes with the central combustion gas, which helps to fully ignite the gas.

[0051] It is worth noting that a shrinkable flow guide shroud 15 is also provided between the outer air ring pipe 4 and the outer shell 1 at the central gas pipe 20. An adjustable flow guide plate 150 is provided at the inner edge of the shrinkable flow guide shroud 15, and an ejector ring slit 16 is provided between the adjustable flow guide plate 150 and the central air ring pipe 23.

[0052] In this utility model, a shrinkable guide hood 15 and an adjustable guide plate 150 are provided for cooperation. The shrinkage angle of the shrinkable guide hood 15 is 15-45 degrees to achieve the coordination of guide speed. The adjustable guide plate 150 adjusts the height of the ejector ring slit 16 according to the different burner power. The height of the ejector ring slit 16 is 25-45mm, thereby achieving the flue gas ejection effect.

[0053] When using the ultra-low nitrogen oxide burner of this embodiment, the user first connects the outer shell 1 with the observation window 10 and the flame detector 11 with the gas injection mechanism, and welds the outer air ring pipe 4 to the outer shell 1. Multiple outer gas branch pipes 17 connect the inside of the outer shell 1 to the injection ring pipe 5. Then, the flow equalizer 14 is installed inside the outer shell 1, and the combustion air channel 12 at the bottom of the outer shell 1 connects the internal space of the flow equalizer 14 with the external space of the outer shell 1. The end of the central adjustment rod 13 is connected to the end of the central gas pipe 20, and the swirl vane 22 is connected to the outer wall of the central gas pipe 20 and the inner wall of the central air ring pipe 23. The shrinkable flow equalizer 15 with the adjustable guide plate 150 is connected to the outer shell 1, and the injection ring slit 16 is located between the adjustable guide plate 150 and the outer wall of the central air ring pipe 23. The ignition end of the igniter 18 is close to the injection hole 21.

[0054] When combustion assistance is required, the central gas enters the central gas pipe 20 through the central gas outer pipe 2, and then enters the central air ring pipe 23 from the end of the central gas pipe 20. It is then ejected from the jet hole 21 and ignited with the help of the igniter 18. The peripheral gas enters the burner chamber through the peripheral gas pipe 3, and after being evenly distributed by the flow equalizer 14, it mixes with the central gas. The peripheral combustion air, through the adjustable guide plate 150 and the contraction guide 15, guides the flue gas from outside the burner through the ejector ring slit 16, forming a mixture of combustion air and flue gas that is ejected from the burner for combustion. The extension and retraction of the central adjustment rod 13 adjusts the position of the jet hole 21 and the swirl blade 22, thereby adjusting the size and position of the central flame. This ensures complete combustion in stages while reducing local high temperatures, achieving low nitrogen oxide emissions, and reducing the pollution emissions caused by incomplete combustion.

Claims

1. An ultra-low nitrogen oxide burner, comprising a housing (1), characterized in that: The outer casing (1) has a central gas pipe (2) at the middle of the left end face. One end of the central gas pipe (2) extends into the interior of the outer casing (1) and the end is provided with a central gas pipe (20). The outer casing (1) has an outer gas pipe (3) near the edge on the left end face. The fuel gas is divided into two parts: central gas and outer gas. The outer casing (1) has a gas ring cavity (6) near the right end of the central gas pipe (2). The outer casing (1) has a gas ejector mechanism at the right end. The gas ejector mechanism includes an outer air ring pipe (4) and several ejector ring pipes (5) on the outer wall of the outer air ring pipe (4). The central gas pipe (20) extends into the outer air ring pipe (4) and the end of the central gas pipe (20) is provided with a central air ring pipe (23). The outer casing (1) also has a flow equalization shroud (14). The inner wall of the outer casing (1) also has several outer gas branch pipes (17) connected to the ejector ring pipes (5).

2. The ultra-low nitrogen oxide burner according to claim 1, characterized in that: Flame detectors (11) are symmetrically provided on the left end face of the outer shell (1). The detection end of the flame detector (11) extends into the interior of the outer shell (1). A fire observation window (10) is also provided on the left end face of the outer shell (1).

3. The ultra-low nitrogen oxide burner according to claim 1, characterized in that: The bottom of the outer shell (1) is provided with a plurality of combustion air channels (12) that are connected to the interior of the outer shell (1), and the interior space of the combustion air channels (12) is connected to the interior space of the outer shell (1).

4. The ultra-low nitrogen oxide burner according to claim 1, characterized in that: The central gas enters the central gas pipe (20) through the central gas outer pipe (2), and enters the central air ring pipe (23) from the end of the central gas pipe (20). Several jet holes (21) are also provided on the outer wall of the end of the central gas pipe (20). The central gas enters the central air ring pipe (23) through the jet holes (21). Several swirl vanes (22) are also provided between the central air ring pipe (23) and the central gas pipe (20).

5. The ultra-low nitrogen oxide burner according to claim 1, characterized in that: The external gas enters the gas ring cavity (6) through the external gas pipeline (3), and then connects to the gas ejector mechanism through the external gas branch pipe (17) and enters the ejector ring pipe (5).

6. The ultra-low nitrogen oxide burner according to claim 1, characterized in that: The external gas enters the burner chamber through the external gas pipeline (3). After being uniformly circulated by the flow equalizer (14), it is divided into two parts: central combustion air and external combustion air. The central combustion air is mixed with the central gas from the radial jet hole (21) through the central air ring pipe (23).

7. The ultra-low nitrogen oxide burner according to claim 6, characterized in that: An igniter (18) is also provided inside the outer casing (1) on the side near the central gas pipe (20), and a central adjusting rod (13) is also provided on the side of the central gas pipe (20).

8. The ultra-low nitrogen oxide burner according to claim 1, characterized in that: A shrinkable flow guide (15) is also provided between the outer air ring pipe (4) and the outer shell (1) at the central gas pipe (20). An adjustable flow guide plate (150) is provided at the inner edge of the shrinkable flow guide (15), and an ejector ring seam (16) is provided between the adjustable flow guide plate (150) and the central air ring pipe (23).

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