Low-nitrogen energy-saving burner

Abstract

The invention belongs to the field of combustors, and particularly relates to a low-nitrogen energy-saving combustor which comprises an outer shell, a connecting pipe is fixedly connected to one end of the outer shell, an air blower set is fixedly connected to the end, away from the outer shell, of the connecting pipe, the air blower set and the connecting pipe communicate with the interior of the outer shell, an inner shell is arranged in the outer shell in a sleeved mode, and annular gaps are formed between the inner shell and the air blower set at intervals. A plurality of air inlet pipes are fixedly connected to the outer wall of the outer shell, the end of each air inlet pipe extends into an annular gap between the outer shell and the inner shell and points to the outer shell, the inner space of the inner shell is a combustion chamber, a fire maker is connected to the outer shell, and the end of the fire maker penetrates through the inner shell and enters the combustion chamber. A mixing part is arranged between the outer shell and the inner shell in one end, close to the connecting pipe, of the outer shell. The nozzle is used for spraying natural gas to generate a siphoning effect, low pressure is generated at the siphoning opening to suck smoke into the annular gap, residual heat of the smoke is used for heating the natural gas in the gas inlet pipe, and the problem that the content of nitrogenous substances is large due to insufficient combustion is solved.

Description

Technical Field

[0001] The invention belongs to the field of burners, and in particular relates to a low-nitrogen energy-saving burner. Background Art

[0002] Gas combustion devices are widely used in industry as an important, efficient combustion device for heat energy conversion. Gas fuels, including natural gas, coal gas, and analytical gas, primarily produce nitrogen oxides as pollutants after combustion. While natural gas-fired burners produce fewer pollutants, they still produce a certain amount of nitrogen oxides, which can cause atmospheric pollution. With increasing awareness of the environment, various improved low-NOx burners have emerged on the market.

[0003] Existing burners usually reduce nitrogen oxide emissions by increasing the mixture of air and gas. However, since the main cause of nitrogen oxide production is the excessively high local temperature of the flame, which causes oxygen and nitrogen to react to form nitrogen oxides, the existing method of increasing the mixture of air and gas is difficult to achieve better emission reduction effects.

[0004] A low-nitrogen, energy-saving, concentrated energy burner, with publication number CN118189161B, includes a blower, the air outlet of which is connected to an air inlet, the end of which is connected to an air outlet pipe, the end of which is connected to multiple combustion nozzles, and a heat circulation mechanism disposed between the air inlet and the air outlet pipe. The heat circulation mechanism includes a circulating pump, a liquid outlet ring and a liquid inlet ring fixed to the outside of the air outlet pipe, and a main heat dissipation pipe fixed inside the air inlet. The two ends of the main heat dissipation pipe are connected to pipes a and b extending to the outside of the air inlet. The heat circulation mechanism drives the coolant inside to circulate continuously. After absorbing the heat from the gas flame, the coolant can cool the flame to a certain extent, making the gas combustion more stable and uniform, avoiding local high temperatures in the flame, thereby reducing the reaction degree of oxygen and nitrogen and reducing the emission of nitrogen oxides.

[0005] However, the above patent still has the following shortcomings: 1. When using natural gas as fuel, it is usually stored in liquid form. When used, it is decompressed and gasified and then introduced into the burner to mix with air for combustion. When it is ejected from the nozzle, the pressure changes suddenly, causing part of the natural gas to liquefy into small droplets again. The liquefied natural gas cannot be burned evenly and completely in the high-speed jet burner, thereby producing nitrogen-containing combustion residues. The above-mentioned patent cannot effectively solve this problem.

[0006] 2. The above patent utilizes coolant to drive the internal thermal circulation of the burner, and utilizes the heat absorbed by the coolant to heat the air, making its molecules move more violently and improving the combustion effect. However, in actual use, the temperature of liquefied natural gas is relatively low after gasification, and the above patent cannot preheat the natural gas. After the natural gas and air are mixed, the temperature of the mixed gas is low and it is not easy to mix fully and evenly, which affects the combustion effect.

[0007] 3. During the use of the burner, air needs to be continuously injected into the burner to provide oxygen for the combustion environment. However, when the oxygen in the air has not been completely consumed, or the oxygen is completely consumed but there is still some residual fuel that cannot be burned out, it will cause incomplete combustion, affecting the energy efficiency of the burner and easily produce residual nitrogen compounds. Summary of the Invention

[0008] In order to overcome the deficiencies of the prior art, the present invention solves the technical problem of being able to more evenly introduce natural gas into the outer shell through a plurality of intake pipes uniformly arranged in the circumferential direction, so that the natural gas and air can be mixed more evenly, avoiding the problem of stratification of natural gas and air due to different densities and inability to fully burn, resulting in excessive nitrogen compounds after combustion. By setting a siphon port, a siphon effect is generated when the nozzle sprays natural gas at high speed, and a low pressure is generated at the siphon port, and then the remaining flue gas in the combustion chamber of the inner shell is sucked into the annular gap through the return air port, and the residual heat of the flue gas is used to heat the natural gas in the intake pipe, thereby improving the efficiency of the natural gas. Temperature increases the activity of molecules, thereby achieving a more uniform and sufficient mixing effect. The residual heat of the flue gas can heat the natural gas in the premixing chamber, effectively preventing the natural gas from being partially liquefied into small droplets due to pressure changes after being ejected from the nozzle, which is not conducive to sufficient combustion. In addition, by setting an expansion area, the natural gas in the intake pipe is prevented from expanding due to heating, causing the intake pipe to burst due to huge air pressure. The sucked-away flue gas can re-enter the combustion chamber. If there is unburned natural gas or unconsumed oxygen remaining in the flue gas, the process of the flue gas re-entering the combustion chamber can fully consume it, effectively reducing the production of nitrogen-containing substances.

[0009] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a low-nitrogen energy-saving burner, comprising: A housing, one end of the housing being fixedly connected to a connecting pipe, an end of the connecting pipe being fixedly connected to a blower unit away from the housing, and the blower unit and the connecting pipe being in communication with the interior of the housing; An inner shell is provided inside the outer shell, an annular gap is provided between the inner shell and the blower unit, and a plurality of air inlet pipes are fixedly connected to the outer wall of the outer shell, with an end portion of each air inlet pipe extending into the annular gap between the outer shell and the inner shell and pointing toward the outer shell; The internal space of the inner shell is a combustion chamber, a lighter is fixedly connected to the outer shell, the end of the lighter passes through the inner shell and enters the combustion chamber, and a mixing component is provided between the outer shell and the inner shell at one end of the outer shell close to the connecting pipe.

[0010] Furthermore, each of the air inlet pipes is connected to a nozzle at its end within the annular gap, and a retaining ring is fixedly connected between the outer shell and the inner shell at a position corresponding to the nozzle. A siphon port is provided on each retaining ring at a position corresponding to each nozzle, and a gap is left between each siphon port and the nozzle. A plurality of return air ports connected to the annular gap are provided at one end of the inner shell away from the connecting pipe.

[0011] Furthermore, the bottom of the blower unit is fixedly connected to a base, a plurality of buffer gaskets are arranged between the blower unit and the base, and track wheels are rotatably connected to the four corners of the base.

[0012] Furthermore, an air supply ring is fixedly connected to the outside of the shell, each of the air inlet pipes is fixedly connected to the air supply ring, and a control valve group is provided on the base below the air supply ring. The control valve group and the air supply ring are connected through a connecting hose.

[0013] Furthermore, an expansion area is provided between each of the air inlet pipes and the corresponding nozzle, and the diameter of each of the expansion areas is larger than the diameter of the air inlet pipe.

[0014] Furthermore, the mixing component includes a mixer, which is fixedly arranged between the outer shell and the inner shell. The mixer is conical in shape, and a plurality of spirally arranged spiral grids are evenly distributed on the side of the mixer close to the nozzle. The space between the outer shell and the inner shell separated by the retaining ring and the mixer is a premixing chamber.

[0015] Furthermore, a plurality of mixing air ducts are evenly arranged inside the inner shell, each of the mixing air ducts is connected to the premixing chamber, and the end of each mixing air duct is inclined away from the blower unit. The diameter of the position where the inner shell is used to set the mixing air duct is smaller than the diameter of the corresponding part of the inner shell combustion chamber.

[0016] Furthermore, the portion of the mixer that contacts the outer shell and the inner shell is provided with a sealing filler.

[0017] Furthermore, one end of the outer shell away from the connecting pipe is fixedly connected to the end cover, and the end cover is communicated with the combustion chamber inside the inner shell. The end of the outer shell close to the end cover is provided with a baffle for shielding high temperature.

[0018] In summary, compared with the prior art, the present invention has the following beneficial effects: (1) Through multiple air inlet pipes evenly arranged in the circumferential direction, natural gas can be introduced into the shell more evenly, so that the natural gas and air can be mixed more evenly, avoiding the problem of stratification of natural gas and air due to different densities and inability to fully burn, resulting in excessive nitrogen compounds after combustion.

[0019] (2) By setting a siphon port, a siphon effect is generated when the nozzle sprays natural gas at high speed, and low pressure is generated at the siphon port, and the remaining flue gas in the combustion chamber of the inner shell is sucked into the annular gap through the return air port. The residual heat of the flue gas is used to heat the natural gas in the intake pipe, thereby increasing the temperature of the natural gas and the activity of the molecules, thereby achieving a more uniform and sufficient mixing effect.

[0020] (3) The residual heat of the flue gas can heat the natural gas in the premixing chamber, effectively preventing the natural gas from being partially liquefied into small droplets due to pressure changes after being ejected from the nozzle, which is not conducive to full combustion. In addition, by setting up an expansion area, the natural gas in the intake pipe is prevented from expanding due to heating, causing the intake pipe to be ruptured by the huge air pressure.

[0021] (4) The smoke that has been sucked away can re-enter the combustion chamber. If there is unburned natural gas or unconsumed oxygen remaining in the smoke, the process of the smoke re-entering the combustion chamber can fully consume it, effectively reducing the production of nitrogen-containing substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional schematic diagram of this patent.

[0023] Figure 2 This is a top view of the patent.

[0024] Figure 3 This is the front view of this patent.

[0025] Figure 4 for Figure 2 Stereoscopic cross-sectional view at AA in the middle.

[0026] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0027] Figure 6 for Figure 4 A partial enlarged view of point C in the middle.

[0028] Figure 7 This is a structural diagram of the main structure of this patent.

[0029] Figure 8 This is a connection diagram of 12 and 20.

[0030] Explanation of the reference numerals: blower unit 10; connecting pipe 11; outer shell 12; baffle 13; end cover 14; air supply ring 15; air inlet pipe 16; expansion area 17; nozzle 18; siphon port 19; baffle ring 20; inner shell 21; return air port 22; mixed air duct 23; mixer 24; spiral grille 25; buffer gasket 26; base 27; track wheel 28; control valve group 29; connecting hose 30; igniter 31. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] like Figure 1-8 As shown, a low-nitrogen energy-saving burner includes an outer shell 12, one end of the outer shell 12 is fixedly connected to a connecting pipe 11, the end of the connecting pipe 11 away from the outer shell 12 is fixedly connected to a blower unit 10, the blower unit 10, the connecting pipe 11 and the outer shell 12 are connected to each other, and a plurality of air intake pipes 16 are fixedly connected to the outer shell 12 in a uniformly distributed circumferential direction, and one end of each air intake pipe 16 located in the outer shell 12 points to the connecting pipe 11, and an air supply ring 15 is fixedly connected to the outside of the outer shell 12, and each air intake pipe 16 is fixedly connected to the air supply ring 15.

[0033] By using multiple air inlet pipes 16 evenly arranged in the circumferential direction, natural gas can be introduced into the outer shell 12 more evenly, so that the natural gas and air can be mixed more evenly, avoiding the problem of stratification of natural gas and air due to different densities and inability to fully burn, resulting in excessive nitrogen compounds after combustion.

[0034] like Figure 1-8 As shown, an inner shell 21 is provided inside the outer shell 12, and the internal space of the inner shell 21 is a combustion chamber. An annular gap is left between the inner shell 21 and the outer shell 12, and the part of each air intake pipe 16 located inside the outer shell 12 is located in the annular gap. The inner shell 21 has a through air return port 22 evenly distributed in the circumferential direction at one end away from the connecting pipe 11. The end of each air intake pipe 16 located in the annular gap is fixedly connected to the expansion area 17, and the end of each expansion area 17 is fixedly connected to the nozzle 18. A retaining ring 20 is fixedly connected between the outer shell 12 and the inner shell 21 at a position corresponding to the nozzle 18, and a siphon port 19 is provided on the retaining ring 20 at a position corresponding to each nozzle 18, with a gap left between each siphon port 19 and the nozzle 18.

[0035] By providing the siphon port 19, a siphon effect is generated when the nozzle 18 ejects natural gas at high speed, generating low pressure at the siphon port 19, and then the flue gas remaining from the combustion chamber of the inner shell 21 is sucked into the annular gap through the return air port 22. The residual heat of the flue gas is then used to heat the natural gas in the intake pipe 16, thereby increasing the temperature of the natural gas and the activity of the molecules, thereby achieving a more uniform and sufficient mixing effect.

[0036] At the same time, the residual heat of the flue gas can effectively prevent the natural gas from being partially liquefied into small droplets due to pressure changes after being ejected from the nozzle 18, which is not conducive to sufficient combustion. In addition, by setting up the expansion area 17, the natural gas in the intake pipe 16 is prevented from expanding due to heating, causing the intake pipe 16 to be broken by the huge air pressure.

[0037] like Figure 1-8 As shown, the bottom of the blower unit 10 is fixedly connected to a base 27, a plurality of buffer gaskets 26 are arranged between the blower unit 10 and the base 27, track wheels 28 are rotatably connected to the four corners of the base 27, and a control valve group 29 is provided on the base 27 below the air supply ring 15, and the control valve group 29 is connected to the air supply ring 15 through a connecting hose 30.

[0038] By providing the base 27 and the track wheels 28, the device can be easily moved during use, and by providing the buffer pad 26, the impact of vibrations of the external environment on the operation of the device during use can be reduced, as well as the vibration of the device itself during operation.

[0039] At the same time, the flow rate and flow velocity of the supplied natural gas can be stably controlled by controlling the valve group 29, thereby ensuring that the device maintains the best combustion conditions.

[0040] like Figure 1-8 As shown, a mixer 24 is fixedly connected to one end of the outer shell 12 near the connecting pipe 11, and the mixer 24 is fixedly connected to the outer shell 12 and the inner shell 21 and is filled with sealing filler. The mixer 24 is conical, and a plurality of spirally arranged spiral grids 25 are evenly distributed on one side of the mixer 24 near the nozzle 18. The space between the outer shell 12 and the inner shell 21 separated by the retaining ring 20 and the mixer 24 is a premixing chamber, and a plurality of mixing air ducts 23 are evenly arranged inside the inner shell 21, each mixing air duct 23 is connected to the premixing chamber, and the end of each mixing air duct 23 is inclined away from the blower unit 10, and the diameter of the position of the inner shell 21 for setting the mixing air duct 23 is smaller than the diameter of the corresponding part of the combustion chamber of the inner shell 21.

[0041] By providing the mixer 24 and the spiral grid 25, the natural gas ejected from the nozzle 18 and the smoke sucked away can be fully mixed in advance. When the air flow generated by the blower unit 10 blows through the mixed gas duct 23, the siphon effect generated sucks the mixed natural gas and smoke away together, and the mixed natural gas and smoke are ignited in the combustion chamber, ensuring that the three gases can be mixed relatively evenly and the combustion effect is guaranteed.

[0042] At the same time, the smoke that has been sucked away can re-enter the combustion chamber. If there is natural gas that has not been completely burned or oxygen that has not been completely consumed in the smoke, the process of the smoke re-entering the combustion chamber can fully consume it, effectively reducing the production of nitrogen-containing substances.

[0043] The inner shell 21 is used to set a small diameter setting at the mixing air duct 23, so that when the air flow blown out by the blower unit 10 passes through this place, the air flow velocity is accelerated, the siphon effect generated at the mixing air duct 23 is enhanced, and the mixing effect of the gas and air in the premixing chamber is improved. At the same time, the small diameter setting can make more space for the premixing chamber, so that the mixing process of natural gas and flue gas can be more complete.

[0044] like Figure 1-8 As shown, the end of the outer shell 12 away from the connecting pipe 11 is fixedly connected to the end cover 14, and the end cover 14 is connected to the combustion chamber inside the inner shell 21. A baffle 13 for shielding high temperature is provided at the end of the outer shell 12 close to the end cover 14. A lighter 31 is fixedly connected to the outer shell 12, and the end of the lighter 31 passes through the inner shell 21 and enters the combustion chamber.

[0045] By providing the baffle 13 , the high temperature in front of the device during operation can be shielded, thereby preventing the high temperature from causing adverse effects on components such as the air intake pipe 16 .

[0046] In this embodiment, initially, the operator connects the power supply and control system of this patent, and connects the natural gas supply pipeline with the control valve group 29. During operation, the control valve group 29 is first adjusted to supply natural gas to the air supply ring 15 and adjusted to a suitable two-point air pressure. The natural gas in the air supply ring 15 enters the multiple air inlet pipes 16 under the action of air pressure, and is finally sprayed out from the nozzle 18 into the premixing chamber.

[0047] At the same time, the blower unit 10 is started to suck in external air and generate airflow to blow into the inner shell 21. The flow rate increases when the airflow passes through the smaller diameter part of the inner shell 21, and a significant siphon effect is generated at the mixing gas duct 23, which sucks the natural gas in the premixing chamber into the combustion chamber inside the inner shell 21 for mixing.

[0048] When the concentration of the mixed gas in the combustion chamber reaches the ignition condition, the operator generates an electric spark in the combustion chamber through the igniter 31 to ignite the mixed gas of natural gas and air in the combustion chamber.

[0049] During the initial combustion, uneven combustion is likely to occur due to insufficient combustion temperature and other reasons, resulting in the generation of smoke. At this time, since the nozzle 18 continuously ejects a high-speed natural gas flow, the natural gas flow produces a siphon effect when passing through the siphon port 19, generating low pressure, causing part of the smoke in the combustion chamber to enter the annular gap between the outer shell 12 and the inner shell 21 through the return air port 22.

[0050] When natural gas is ejected at high speed from the nozzle 18, it is easy to partially liquefy due to the sudden change in pressure, producing a small amount of natural gas in the form of liquid droplets. If the liquefied natural gas enters the combustion chamber with the high-speed airflow generated by the blower unit 10, the airflow velocity is relatively fast, and the natural gas in the form of liquid droplets burns slower than the fully vaporized natural gas. This can easily cause the liquefied natural gas to leave the combustion chamber before it is completely consumed, which can easily lead to incomplete combustion and the production of excessive nitrogen-containing substances.

[0051] When the flue gas enters the annular gap, it will always flow towards the siphon port 19, and the flue gas will carry the residual heat from the combustion until it enters the premixing chamber together with the natural gas ejected from the nozzle 18. The flue gas and natural gas are guided and mixed by the spirally arranged spiral grid 25 and gradually flow to the mixing gas channel 23. While mixing, the residual heat of the flue gas is used to preheat the natural gas, effectively avoiding the problem of natural gas liquefaction affecting the combustion effect. The residual heat of the flue gas can also be used to increase the activity of the molecules and enhance the combustion effect in the subsequent combustion chamber.

[0052] Then, after the flue gas and natural gas are fully mixed in the premixing chamber, they are again sucked into the combustion chamber by the airflow generated by the blower unit 10. At this time, the control valve group 29 can be adjusted according to the actual combustion conditions to make the natural gas concentration reach an appropriate level to ensure the combustion quality.

[0053] The above-mentioned blower unit 10, nozzle 18, control valve unit 29, etc. are mature existing technologies and will not be described in detail herein.

[0054] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0055] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0056] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the application concept described herein through the above teachings or technology or knowledge in the relevant field. Modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present application should be protected by the claims appended hereto.

Claims

1. A low-nitrogen energy-saving burner, characterized in that: The low-nitrogen energy-saving burner comprises: A housing (12), one end of the housing (12) being fixedly connected to a connecting pipe (11), an end of the connecting pipe (11) away from the housing (12) being fixedly connected to a blower unit (10), and the blower unit (10), the connecting pipe (11) and the interior of the housing (12) being in communication; An inner shell (21), wherein the outer shell (12) is provided with the inner shell (21), an annular gap is provided between the inner shell (21) and the blower unit (10), and a plurality of air inlet pipes (16) are fixedly connected to the outer wall of the outer shell (12), and an end portion of each air inlet pipe (16) extends into the annular gap between the outer shell (12) and the inner shell (21) and points toward the outer shell (12); The inner space of the inner shell (21) is a combustion chamber, a lighter (31) is fixedly connected to the outer shell (12), an end of the lighter (31) passes through the inner shell (21) and enters the combustion chamber, and a mixing component is provided between the outer shell (12) and the inner shell (21) at one end of the outer shell (12) close to the connecting pipe (11).

2. A low nitrogen energy-saving burner according to claim 1, characterized in that: The end of each air inlet pipe (16) located in the annular gap is connected to a nozzle (18); a retaining ring (20) is fixedly connected between the outer shell (12) and the inner shell (21) at a position corresponding to the nozzle (18); a siphon port (19) is provided on each retaining ring (20) at a position corresponding to each nozzle (18); a gap is left between each siphon port (19) and the nozzle (18); and a plurality of return air ports (22) connected to the annular gap are opened at one end of the inner shell (21) away from the connecting pipe (11).

3. A low nitrogen energy-saving burner according to claim 2, characterized in that: The bottom of the blower unit (10) is fixedly connected to a base (27), a plurality of buffer pads (26) are arranged between the blower unit (10) and the base (27), and track wheels (28) are rotatably connected to the four corners of the base (27).

4. A low-nitrogen energy-saving burner according to claim 3, characterized in that: An air supply ring (15) is fixedly connected to the outside of the housing (12), and each of the air inlet pipes (16) is fixedly connected to the air supply ring (15). A control valve group (29) is provided on the base (27) below the air supply ring (15), and the control valve group (29) is connected to the air supply ring (15) via a connecting hose (30).

5. A low nitrogen energy-saving burner according to claim 2, characterized in that: An expansion area (17) is provided between each of the air inlet pipes (16) and the corresponding nozzle (18), and the diameter of each of the expansion areas (17) is larger than the diameter of the air inlet pipe (16).

6. A low nitrogen energy-saving burner according to claim 1, characterized in that: The mixing component comprises a mixer (24), which is fixedly arranged between the outer shell (12) and the inner shell (21). The mixer (24) is conical in shape. A plurality of spiral grids (25) arranged in a spiral shape are evenly distributed on one side of the mixer (24) close to the nozzle (18). The space between the outer shell (12) and the inner shell (21) separated by the retaining ring (20) and the mixer (24) is a premixing chamber.

7. A low nitrogen energy-saving burner according to claim 6, characterized in that: A plurality of mixed air passages (23) are evenly arranged inside the inner shell (21), each of the mixed air passages (23) is communicated with the premixing chamber, and the end of each mixed air passage (23) is inclined in a direction away from the blower unit (10). The diameter of the position where the mixed air passage (23) is arranged in the inner shell (21) is smaller than the diameter of the corresponding portion of the combustion chamber of the inner shell (21).

8. A low-nitrogen energy-saving burner according to claim 6, characterized in that: The portion of the mixer (24) that contacts the outer shell (12) and the inner shell (21) is provided with a sealing filler.

9. The low-nitrogen energy-saving burner according to claim 1, characterized in that: One end of the outer shell (12) away from the connecting pipe (11) is fixedly connected to the end cover (14), and the end cover (14) is communicated with the combustion chamber inside the inner shell (21). One end of the outer shell (12) close to the end cover (14) is provided with a baffle (13) for shielding high temperature.

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