A low nitrogen burner for exhaust gas treatment

Abstract

The present application relates to a low-nitrogen burner for exhaust gas treatment, which belongs to the technical field of burners and comprises: an air duct, a gas pipe coaxially arranged inside the air duct, a first end of the gas pipe bent and extending out of the air duct, a plurality of central gas nozzles respectively arranged at the second end of the gas pipe, a plurality of inner ring gas pipes circumferentially arranged outside the second end of the gas pipe and extending radially along the gas pipe, the inner ring gas pipe is connected to the gas pipe, an outer ring gas pipe is arranged outside the gas pipe and distributed circumferentially along the gas pipe, one end of the outer ring gas pipe is connected to the gas pipe, and the other end passes through the air duct and extends along the length direction of the air duct, an ejector pipe is used to guide the exhaust gas circulation inside the combustion chamber, the gas enters from the first end of the gas pipe, and is ejected from the central gas nozzle, the inner ring gas pipe and the outer ring gas pipe respectively, the inner ring gas pipe can ignite the gas and radially eject flames to ignite the gas ejected from the central gas nozzle and the outer ring gas pipe, and further spread the combustion range.

Description

Technical Field

[0001] The present application relates to the technical field of burners, and in particular to a low-nitrogen burner for exhaust gas treatment. Background Art

[0002] As we all know, nitrogen oxides generated during fuel combustion are the main cause of photochemical smog and the main factor in the formation of acid rain, which seriously harms the atmospheric environment and human health. In addition, research results show that NO x It is also an important source of PM2.5 particles in the atmosphere and one of the main culprits of smog weather. When burning various types of coal gas, industrial tail gas and industrial waste gas, burners are generally used and the burners are set in the combustion chamber to burn the above-mentioned garbage and waste.

[0003] The nitrogen oxides produced by gas burners are mainly thermal nitrogen oxides. Thermal nitrogen oxides are formed by oxidation of nitrogen in the air under high temperature conditions. The amount of nitrogen oxides produced mainly depends on the temperature and the time the exhaust gas stays in the high temperature zone. Experiments show that under the same conditions, the amount of nitrogen oxides produced increases with increasing temperature. When the temperature is below 1500°C, almost no thermal nitrogen oxides are produced. Theory shows that the amount of nitrogen oxides produced is proportional to the time the high-temperature exhaust gas stays in the high temperature zone during combustion.

[0004] In order to ensure its combustion efficiency, the temperature of existing burners is generally high. At the same time, since the exhaust gas stays in the combustion area for a long time, a large amount of nitrogen oxides will be produced during the combustion process, which increases the burden on subsequent exhaust gas treatment work. Summary of the invention

[0005] The present application provides a low-nitrogen burner for exhaust gas treatment, which can solve the problem that existing burners produce excessive nitrogen oxides and require multiple processes to treat the exhaust gas during combustion, which is not environmentally friendly.

[0006] The technical solution of the present application is as follows: A low nitrogen burner for exhaust gas treatment, comprising:

[0007] Air duct;

[0008] A gas pipe is coaxially arranged inside the air duct, a first end of the gas pipe is bent and extends out of the air duct, and a second end of the gas pipe is respectively provided with a plurality of central gas nozzles;

[0009] A plurality of inner ring gas pipes are circumferentially spaced outside the second end of the gas pipe and extend radially along the gas pipe, the inner ring gas pipes are connected to the gas pipe and are used to ignite the gas, or

[0010] One end of the inner ring gas pipe is connected to the gas pipe, and the other end is provided with a strip-shaped gas nozzle, the gas nozzle extends along the radial direction of the gas pipe, and one side of the gas nozzle is provided with a guide plate arranged at an acute angle with the rectifying disk;

[0011] An outer ring gas pipe is arranged outside the gas pipe and distributed along the circumference of the gas pipe, one end of the outer ring gas pipe is connected to the gas pipe, and the other end passes through the air pipe and extends along the length direction of the air pipe;

[0012] An ejector pipe is arranged outside the air duct and corresponds to the outer ring gas pipe one by one, and is used to guide the exhaust gas circulation inside the combustion chamber;

[0013] The low-nitrogen burner for exhaust gas treatment also includes a rectifying disk, which is coaxially mounted on the outside of the gas pipe and located on a side of the inner ring gas pipe away from the central gas nozzle, and a plurality of strip vents spaced circumferentially are provided inside the rectifying disk, the strip vents extend radially along the rectifying disk, and a baffle is provided on one side of the vents at an acute angle to the rectifying disk;

[0014] The gas enters from the first end of the gas pipe and is ejected from the central gas nozzle, the inner ring gas pipe and the outer ring gas pipe respectively. The inner ring gas pipe can ignite the gas and radially eject flames to ignite the gas ejected from the central gas nozzle and the outer ring gas pipe and further spread the combustion range.

[0015] By adopting the above scheme, the gas is introduced into the outer ring gas pipe, the central gas nozzle and the inner ring gas pipe respectively, thereby realizing the gas diversion, which can effectively reduce the combustion temperature of the burner. At the same time, the gas outlet direction of the central gas nozzle and the inner ring gas pipe is set to the radial direction of the gas pipe, so that both of them spray radial flames. The radial flames can assist the device to ignite the gas of the outer ring gas pipe. At the same time, when the three streams of gas are sprayed and burned, convection collision is formed, which further expands the combustion range and reduces the combustion temperature.

[0016] In addition, an ejector pipe is provided at the outlet of the outer ring gas pipe. When the high-speed gas enters the ejector pipe, due to the high flow rate, the tail gas generated by the combustion in the combustion chamber will be sucked into the ejector pipe together, so that the tail gas can circulate inside the combustion chamber instead of staying in the high-temperature area of ​​combustion, thereby effectively reducing the emission of nitrogen oxides.

[0017] By connecting the inner circle gas pipe and setting a strip-shaped gas nozzle, the air outlet direction forms an acute angle with the rectifying disk, so that the inner circle gas generates a spiral airflow when it is ejected, and ejects along the radial direction of the gas pipe, which can further increase the flow rate ejected from the inner circle gas pipe, and enable it to ignite the gas of the outer circle gas pipe more quickly, and collide with the gas of the outer circle gas pipe to spread the combustion range;

[0018] In addition, a rectifying disk is arranged inside the air duct, so that when external air enters the air duct and then enters the rectifying disk, it can be ejected from the strip ventilation holes which are arranged circumferentially and extend radially. At the same time, a baffle which is angled with the rectifying disk is arranged on one side of the strip ventilation hole, thereby optimizing the air outlet direction, allowing the air flow to be ejected in a spiral manner, thereby spreading the range of flame combustion and improving the uniformity of mixing between the gas and air.

[0019] In one embodiment of the present application, the air duct comprises:

[0020] An external tube, the external tube being mounted outside the combustion chamber;

[0021] An internal pipe, the internal pipe is installed inside the combustion chamber, and one end of the internal pipe is connected to the external pipe;

[0022] A combustion tube is assembled at the other end of the inner tube and communicated with the inner tube. The diameter of the outer tube is larger than that of the combustion tube, and the diameter of the combustion tube is larger than that of the inner tube.

[0023] By adopting the above scheme, three external tubes with different diameters are set, and the internal tube and the combustion tube form an air duct. When the external air enters the combustion tube, it first shrinks and then expands, thereby effectively improving the mixing degree of air and gas and effectively improving the uniformity of combustion.

[0024] In one embodiment of the present application, the gas pipe comprises:

[0025] A first tube body, which is coaxially disposed inside the air duct and extends along the length direction of the air duct;

[0026] A second tube body, which is concentrically assembled at one end of the first tube body and extends along the length direction of the air duct, and the diameter of the second tube body is smaller than the diameter of the first tube body;

[0027] An air intake pipe, one end of which is tangentially mounted on the side wall of the other end of the first tube body and is communicated with the first tube body.

[0028] By adopting the above scheme, by setting the diameter of the second tube body and the second tube body, after the gas enters the gas pipe, it passes through the contracted second tube body, thereby increasing the flow rate. At the same time, when the gas enters the second tube body in the intake pipe, since the intake pipe is tangentially arranged along the side wall of the second tube body, a vortex is generated when the gas enters the second tube body, thereby further increasing the speed of the gas ejection.

[0029] In one embodiment of the present application, the plurality of central gas nozzles and the plurality of inner ring gas pipes are spaced apart along the circumference of the gas pipe, and the central gas nozzle is located on a side of the inner ring gas pipe away from the outer pipe.

[0030] By adopting the above scheme, by arranging the central gas nozzle and the inner circle gas pipe at intervals on the circumference of the gas pipe, the ignition points of the two are staggered when they spray gas and burn, and the ignition point of the inner circle gas pipe is extended, and the combustion range of the diffusion device is extended, thereby effectively reducing the combustion temperature.

[0031] In one embodiment of the present application, the ejector tube comprises:

[0032] A straight pipe, one end of which is provided with a plurality of outer ring nozzles spaced apart along its circumference, and the straight pipe is mounted outside the air duct;

[0033] An ejection hood, one end of which is coaxially arranged on the other end of the straight pipe and connected to the straight pipe, the other end of the outer ring gas pipe extends into one end of the ejection hood, and a drainage gap is provided between the other end of the outer ring gas pipe and the ejection hood, and the ratio X of the length and diameter of the straight pipe satisfies: X≥6.

[0034] By adopting the above scheme, a circumferentially arranged outer ring nozzle is provided at one end of the straight pipe, so that the flame ejected from one end of the straight pipe can form multiple branch streams ejected radially along the branch pipe, and the branch streams can collide with the flames ejected from the central gas nozzle and the inner ring gas pipe, thereby further diffusing the combustion range to reduce the combustion temperature. At the same time, the exhaust gas generated in the combustion chamber can enter the ejection hood driven by the fuel gas, and by extending the length of the straight pipe, the exhaust gas can be fully mixed with the fuel gas to improve the uniformity of combustion.

[0035] In one embodiment of the present application, the diameter of the straight pipe is larger than the diameters of the central gas nozzle and the inner ring gas pipe, and the diameter of the inner ring gas pipe is not smaller than the diameter of the central gas nozzle.

[0036] By adopting the above scheme, the diameters of the outer ring nozzle, the core gas nozzle and the inner ring gas pipe are limited, thereby limiting the gas flow ejected from the three, and then reasonably distributing the gas introduced into the gas pipe, ensuring the combustion efficiency while effectively reducing the combustion temperature to reduce the emission of nitrogen oxides.

[0037] In one embodiment of the present application, a plurality of inclined air holes are provided inside the rectifier disk, the inclined air holes and the rectifier disk are arranged at an acute angle to each other, the inclined air holes are distributed at intervals along the circumference of the rectifier disk, and extend radially along the rectifier disk.

[0038] By adopting the above scheme, circumferentially distributed and radially extending inclined air holes are arranged inside the rectifier disk, and the air outlet direction of the inclined air holes is arranged to form an angle with the surface of the rectifier disk, which can also achieve the effect of spiral air outlet and reduce the material consumption.

[0039] In one embodiment of the present application, the central gas nozzle is provided with a central extension tube connected to the central gas nozzle, the central extension tube extends radially along the gas pipe, the central extension tube corresponds one-to-one with the inner circle gas pipe, and is arranged between two adjacent gas nozzles.

[0040] By adopting the above scheme, a central extension pipe is arranged on the central gas nozzle, so that the gas ejected from the central gas nozzle can be ejected from the pipe mouth of the central extension pipe. Since the central gas pipe is arranged on one side of the inner circle gas pipe, the gas ejected from the central extension pipe collides with the gas ejected from the inner circle gas pipe, which can further spread the range of flame combustion.

[0041] In summary, the present application includes at least one of the following beneficial technical effects:

[0042] 1. By dividing the gas in the gas pipe into three streams, the area of ​​flame combustion can be effectively spread, so that the flame combustion will not be too concentrated, thereby reducing the central temperature of the flame combustion. At the same time, by arranging the air outlet direction of the central gas nozzle and the inner circle gas pipe, when the flame is ejected, it can assist in igniting the gas ejected from the outer circle gas pipe.

[0043] 2. By setting up the ejector pipe, when the outer circle gas pipe ejects gas, the flow rate is higher than that of the exhaust gas in the combustion chamber, thereby forming a relative negative pressure, and driving the exhaust gas generated by the combustion to enter the ejector pipe along with the gas and eject it for combustion, so that the exhaust gas inside the combustion chamber can circulate inside the combustion chamber, avoiding the accumulation of exhaust gas in the high-temperature combustion area to produce more nitrogen oxides.

[0044] 3. By setting a rectifier disk, the air flow inside the air duct can be discharged radially in a spiral shape when passing through the rectifier disk, thereby effectively improving the uniformity of mixing between the air flow and the gas. At the same time, the radially discharged air flow can carry the gas and collide with the gas ejected from the outer circle gas pipe to further spread the range of flame combustion, thereby reducing the combustion temperature and reducing the generation of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a front view of a low nitrogen burner for exhaust gas treatment provided in the first embodiment of the present application;

[0046] Figure 2This is a front view of an inner ring gas pipe of a low nitrogen burner for exhaust gas treatment provided in the first embodiment of the present application;

[0047] Figure 3 is a front cross-sectional view of a low nitrogen burner for exhaust gas treatment provided in the first embodiment of the present application;

[0048] Figure 4 It is a front cross-sectional view of an outer ring gas pipe of a low-nitrogen burner for exhaust gas treatment provided in the first embodiment of the present application;

[0049] Figure 5 is a bottom sectional view of an intake pipe of a low nitrogen burner for exhaust gas treatment provided in the first embodiment of the present application;

[0050] Figure 6 This is a front view of a rectifier disk of a low-nitrogen burner for exhaust gas treatment provided in the second embodiment of the present application;

[0051] Figure 7 It is a front cross-sectional view of an outer ring gas pipe of a low-nitrogen burner for exhaust gas treatment provided in the third embodiment of the present application;

[0052] Figure 8 This is a top view of the inner ring gas pipe of a low-nitrogen burner for exhaust gas treatment provided in the third embodiment of the present application.

[0053] Explanation of the reference numerals: 1. air duct; 11. external tube; 12. internal tube; 13. combustion tube; 2. gas pipe; 21. first tube body; 22. second tube body; 23. air inlet pipe; 3. central gas nozzle; 31. central extension tube; 4. inner ring gas pipe; 41. gas nozzle; 42. guide plate; 5. outer ring gas pipe; 6. ejector tube; 61. straight tube; 611. outer ring nozzle; 612. drainage gap; 62. ejector hood; 7. rectifying disk; 71. strip vent; 72. baffle; 73. inclined air hole. DETAILED DESCRIPTION

[0054] The following is combined with Figure 1-Figure 8 A low-nitrogen burner for exhaust gas treatment provided in the present application is further described in detail.

[0055] Example 1

[0056] A low-nitrogen burner for exhaust gas treatment provided in an embodiment of the present application includes: an air duct 1, a gas pipe 2, an inner ring gas pipe 4, an outer ring gas pipe 5 and an ejector pipe 6.

[0057] See also Figure 1 and Figure 3The air duct 1 includes: an external tube 11, an internal tube 12 and a combustion tube 13. The external tube 11 is installed on the outside of the combustion chamber, and the internal tube 12 is installed inside the combustion chamber. One end of the internal tube 12 is connected to the external tube 11, and the combustion tube 13 is installed at the other end of the internal tube 12 and is connected to the internal tube 12. The diameter of the external tube 11 is larger than the diameter of the combustion tube 13, and the diameter of the combustion tube 13 is larger than the diameter of the internal tube 12. By adjusting the diameter shape of each part of the air duct 1, the air flow is first contracted and then expanded when it is introduced into the combustion chamber, which can ensure the gas flow rate while making the air and the gas evenly mixed.

[0058] See also Figure 3 and Figure 5 The gas pipe 2 is coaxially arranged inside the air duct 1, the first end of the gas pipe 2 is bent and extends out of the air duct 1, and the second end of the gas pipe 2 is respectively provided with a plurality of central gas nozzles 3;

[0059] The gas pipe 2 includes: a first tube body 21, a second tube body 22 and an air intake pipe 23. The first tube body 21 is coaxially arranged inside the air duct 1 and extends along the length direction of the air duct 1. The second tube body 22 is concentrically assembled at one end of the first tube body 21 and extends along the length direction of the air duct 1. The diameter of the second tube body 22 is smaller than the diameter of the first tube body 21. One end of the air intake pipe 23 is tangentially assembled on the side wall of the other end of the first tube body 21 and is connected to the first tube body 21. By arranging the air intake pipe 23 and the first tube body 21 and the second tube body 22 with diameters that are larger in diameter and smaller in diameter, the ejection speed of the gas is improved.

[0060] See also Figure 2 A plurality of central gas nozzles 3 and a plurality of inner ring gas pipes 4 are distributed at intervals along the circumference of the gas pipe 2. The central gas nozzles 3 are located on the side of the inner ring gas pipe 4 away from the external pipe 11. By staggering the radially exhausting central gas nozzles 3 and the inner ring gas nozzles 41, the ignition points of the two are staggered, thereby avoiding concentrated combustion and excessively high temperature.

[0061] A plurality of inner ring gas pipes 4 are provided and are circumferentially spaced outside the second end of the gas pipe 2 and extend radially along the gas pipe 2. The inner ring gas pipes 4 are connected to the gas pipe 2 and are used to ignite the gas.

[0062] The outer ring gas pipe 5 is arranged outside the gas pipe 2 and distributed along the circumference of the gas pipe 2. One end of the outer ring gas pipe 5 is connected to the gas pipe 2, and the other end passes through the air pipe 1 and extends along the length direction of the air pipe 1.

[0063] See also Figure 1 , Figure 3 and Figure 4 The ejector pipe 6 is arranged outside the air duct 1 and corresponds to the outer ring gas pipe 5 one by one, and is used to guide the exhaust gas circulation inside the combustion chamber;

[0064] The ejector pipe 6 includes: a straight pipe 61 and an ejector hood 62. One end of the straight pipe 61 is provided with a plurality of spaced outer ring nozzles 611 along its circumference. The straight pipe 61 is mounted on the outside of the air duct 1. One end of the ejector hood 62 is coaxially arranged on the other end of the straight pipe 61 and is connected with the straight pipe 61. The other end of the outer ring gas pipe 5 extends into one end of the ejector hood 62. A drainage gap 612 is arranged between the other end of the outer ring gas pipe 5 and the ejector hood 62. The ratio X of the length and diameter of the straight pipe 61 satisfies: X≥6. By limiting the length and diameter of the straight pipe 61 and arranging the ejector hood 62 at one end of the straight pipe 61 close to the outer ring gas pipe 5, the high-speed gas ejected from the outer ring gas pipe 5 can carry the exhaust gas into the ejector hood 62, thereby realizing the circulation of the exhaust gas inside the combustion chamber.

[0065] Please continue reading Figure 1 , Figure 3 and Figure 4 The diameter of the straight pipe 61 is larger than the diameters of the central gas nozzle 3 and the inner circle gas pipe 4, and the diameter of the inner circle gas pipe 4 is not smaller than the diameter of the central gas nozzle 3. By limiting the diameters of the central gas nozzle 3, the inner circle gas pipe 4 and the outer circle nozzle 611, the proportion of the gas flow ejected from the three is limited.

[0066] The gas enters from the first end of the gas pipe 2 and is ejected from the central gas nozzle 3, the inner circle gas pipe 4 and the outer circle gas pipe 5 respectively. The inner circle gas pipe 4 can ignite the gas and radially eject flames to ignite the gas ejected from the central gas nozzle 3 and the outer circle gas pipe 5, and further spread the combustion range. The gas in the gas pipe 2 is divided into three streams and burned from different positions, thereby expanding the combustion range and reducing the combustion temperature. The ejector pipe 6 is added to use high-speed gas to drive the exhaust gas to circulate inside the combustion chamber, thereby avoiding the accumulation of exhaust gas in the high-temperature combustion area and reducing the generation of nitrogen oxides.

[0067] In this embodiment, an ignition electrode is provided at one end of one of the inner ring gas pipes 4, and the mixed gas and air are ignited by the ignition electrode. The generated flame continues to ignite the gas ejected from the central gas nozzle 3 and the outer ring gas pipe 5.

[0068] Among them, the gas proportion of the central gas nozzle 3 can be 10-20% by mass fraction, the gas proportion of the inner circle gas pipe 4 can be 10-30% by mass fraction, and the gas proportion of the outer circle gas pipe 5 can be 50-80% by mass fraction.

[0069] See also Figure 2The low nitrogen burner for exhaust gas treatment also includes a rectifying disk 7, which is coaxially assembled on the outside of the gas pipe 2 and is located on the side of the inner ring gas pipe 4 away from the central gas nozzle 3. A plurality of circumferentially spaced strip vents 71 are provided inside the rectifying disk 7. The strip vents 71 extend radially along the rectifying disk 7. A baffle 72 is provided on one side of the vent to form an acute angle with the rectifying disk 7. By providing a plurality of strip vents 71 on the rectifying disk 7 and limiting the air outlet direction of the rectifying disk 7, air flow can be ejected from the plurality of strip vents 71 to form a spiral radially ejected air flow, which helps to improve the degree of mixing with the gas and further expand the combustion range.

[0070] Example 2

[0071] See also Figure 6 Embodiment 2 is basically the same as embodiment 1, except that: a plurality of inclined air holes 73 are provided inside the rectifying disk 7, and the inclined air holes 73 and the rectifying disk 7 are arranged at an acute angle to each other. The inclined air holes 73 are distributed at intervals along the circumference of the rectifying disk 7 and extend along the radial direction of the rectifying disk 7. By providing a plurality of inclined air holes 73 with inclined inner walls inside the rectifying disk 7, the air can still form a spiral radial air flow after being guided by the inclined air holes 73, while reducing the material used.

[0072] Example 3

[0073] See also Figure 7 and Figure 8 The structure of embodiment 3 is basically the same as that of embodiment 1, except that one end of the inner ring gas pipe 4 is connected to the gas pipe 2, and the other end is provided with a strip-shaped gas nozzle 41, the gas nozzle 41 extends along the radial direction of the gas pipe 2, and one side of the gas nozzle 41 is provided with a guide plate 42 arranged at an acute angle to the rectifying disk 7. By setting the air outlet end of the inner ring gas nozzle to the gas nozzle 41 arranged at an acute angle to the rectifying disk 7, the flame ejected from the inner ring gas nozzle is a spiral and radial flame, which is convenient for igniting the outer ring gas pipe 5 and further expands the combustion range.

[0074] See also Figure 7 and Figure 8 The central gas nozzle 3 is provided with a central extension pipe 31 connected to the central gas nozzle 3. The central extension pipe 31 extends in the radial direction of the gas pipe 2. The central extension pipe 31 corresponds to the inner circle gas pipe 4 one by one and is arranged between two adjacent gas nozzles 41. By setting the central extension pipe 31, the central extension pipe 31 corresponding to the inner circle gas pipe 4 is arranged one by one, so that when the gas ejected from the central extension pipe 31 is burned, the flame formed can collide with the inner circle gas pipe 4, further expanding the combustion range of the flame to reduce the combustion temperature, and at the same time making it easier to ignite the gas in the outer circle gas pipe 5.

[0075] In summary, when the device is arranged inside the combustion chamber and combustion is performed, the gas first enters one end of the intake pipe 23 and enters the first tube body 21 at the other end of the intake pipe 23. The gas is split once in the first tube body 21, so that most of it enters the outer ring gas pipe 5, and the other part is split again at the second tube body 22, and enters the inner ring gas pipe 4 and the central gas nozzle 3 respectively, forming three streams of gas. When ignited, the inner ring gas pipe 4 is ignited by the ignition electrode, and the flame generated by the inner ring gas pipe 4 ignites the gas in the central gas nozzle 3 and the outer ring gas pipe 5 respectively, thereby achieving staged combustion, expanding the combustion range, and reducing the combustion temperature;

[0076] In addition, an ejector pipe 6 is provided at one end of the outer ring gas pipe 5. When high-speed gas is injected into the ejector pipe 6, the exhaust gas inside the combustion chamber can be brought in together. When the gas is ejected from one end of the ejector pipe 6 and burns, the exhaust gas can be treated for the second time, and the exhaust gas inside the combustion chamber can be driven to circulate, so that the exhaust gas will not accumulate in the high-temperature area of ​​combustion, thereby reducing the generation of nitrogen oxides.

[0077] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low nitrogen burner for exhaust gas treatment, characterized in that: include: Air duct (1); A gas pipe (2) is coaxially arranged inside the air pipe (1), a first end of the gas pipe (2) is bent and extends out of the air pipe (1), and a second end of the gas pipe (2) is respectively provided with a plurality of central gas nozzles (3); A plurality of inner ring gas pipes (4) are arranged at intervals in the circumferential direction outside the second end of the gas pipe (2) and extend in the radial direction of the gas pipe (2). The inner ring gas pipes (4) are connected to the gas pipe (2) and are used to ignite the gas, or One end of the inner ring gas pipe (4) is in communication with the gas pipe (2), and the other end is provided with a strip-shaped gas nozzle (41), the gas nozzle (41) extends in the radial direction of the gas pipe (2), and one side of the gas nozzle (41) is provided with a guide plate (42) arranged at an acute angle with the rectifying disk (7); An outer ring gas pipe (5) is arranged outside the gas pipe (2) and distributed along the circumference of the gas pipe (2); one end of the outer ring gas pipe (5) is connected to the gas pipe (2), and the other end passes through the air pipe (1) and extends along the length direction of the air pipe (1); An ejector pipe (6) is arranged outside the air duct (1) and corresponds one-to-one with the outer ring gas pipe (5) to guide the exhaust gas circulation inside the combustion chamber; the low-nitrogen burner for exhaust gas treatment also includes a rectifying disk (7), the rectifying disk (7) is coaxially mounted outside the gas pipe (2) and is located on a side of the inner ring gas pipe (4) away from the central gas nozzle (3), a plurality of strip vents (71) distributed at intervals in the circumferential direction are provided inside the rectifying disk (7), the strip vents (71) extend in the radial direction of the rectifying disk (7), and a baffle (72) is provided on one side of the vent that is arranged at an acute angle to the rectifying disk (7); The gas enters from the first end of the gas pipe (2) and is ejected from the central gas nozzle (3), the inner ring gas pipe (4) and the outer ring gas pipe (5) respectively. The inner ring gas pipe (4) can ignite the gas and eject flames radially to ignite the gas ejected from the central gas nozzle (3) and the outer ring gas pipe (5) and further spread the combustion range. The air duct (1) comprises: An external tube (11), wherein the external tube (11) is mounted outside the combustion chamber; An internal pipe (12), the internal pipe (12) being installed inside the combustion chamber, and one end of the internal pipe (12) being connected to the external pipe (11); a combustion tube (13), the combustion tube (13) being mounted on the other end of the inner tube (12) and being in communication with the inner tube (12); the diameter of the outer tube (11) being larger than the diameter of the combustion tube (13); and the diameter of the combustion tube (13) being larger than the diameter of the inner tube (12); The ejector tube (6) comprises: A straight pipe (61), one end of which is provided with a plurality of outer ring nozzles (611) spaced apart along its circumference, and the straight pipe (61) is mounted on the outside of the air duct (1); An ejection hood (62), one end of which is coaxially arranged on the other end of the straight pipe (61) and communicated with the straight pipe (61), the other end of the outer ring gas pipe (5) extends into one end of the ejection hood (62), a drainage gap (612) is provided between the other end of the outer ring gas pipe (5) and the ejection hood (62), and a ratio X of the length to the diameter of the straight pipe (61) satisfies: X≥6; The diameter of the straight pipe (61) is larger than the diameters of the central gas nozzle (3) and the inner ring gas pipe (4), and the diameter of the inner ring gas pipe (4) is not smaller than the diameter of the central gas nozzle (3).

2. A low nitrogen burner for exhaust gas treatment according to claim 1, characterized in that: The gas pipe (2) comprises: A first tube body (21), the first tube body (21) is coaxially arranged inside the air duct (1) and extends along the length direction of the air duct (1); a second tube body (22), the second tube body (22) being coaxially assembled on one end of the first tube body (21) and extending along the length direction of the air duct (1), the diameter of the second tube body (22) being smaller than the diameter of the first tube body (21); An air intake pipe (23), one end of which is tangentially mounted on the side wall of the other end of the first tube body (21) and is in communication with the first tube body (21).

3. A low nitrogen burner for exhaust gas treatment according to claim 2, characterized in that: The plurality of central gas nozzles (3) and the plurality of inner ring gas pipes (4) are distributed at intervals along the circumference of the gas pipe (2), and the central gas nozzles (3) are located on a side of the inner ring gas pipe (4) away from the external pipe (11).

4. A low nitrogen burner for exhaust gas treatment according to claim 1, characterized in that: A plurality of inclined air holes (73) are provided inside the rectifying disk (7), the inclined air holes (73) and the rectifying disk (7) are arranged at an acute angle to each other, the inclined air holes (73) are distributed at intervals along the circumference of the rectifying disk (7), and extend along the radial direction of the rectifying disk (7).

5. A low nitrogen burner for exhaust gas treatment according to claim 1, characterized in that: The central gas nozzle (3) is provided with a central extension pipe (31) which is in communication with the central gas nozzle. The central extension pipe (31) extends radially along the gas pipe (2). The central extension pipe (31) corresponds one-to-one with the inner ring gas pipe (4) and is arranged between two adjacent gas nozzles (41).

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