A low-nitrogen burner

Abstract

This invention provides a low-NOx burner, relating to the field of burner technology. It includes a burner support cylinder comprising an insulated outer cylinder, within which a burner adjustment port is fixedly installed. A bottom support cylinder is fixedly installed at the bottom of the insulated outer cylinder, and a fuel supply unit is fixedly installed within the bottom support cylinder. The fuel supply unit includes a pipe clamping plate, which is fixedly installed at the bottom of the bottom support cylinder. This invention, through the cooperation of coolant pipes and a heat-conducting support, can effectively reduce the temperature of the fuel gas and flue gas, thereby reducing nitrogen production. Furthermore, the space between the burner adjustment port and the fuel supply unit allows for more thorough mixing of flue gas and fuel gas, while simultaneously reducing the impact of combustion zone temperature on the fuel gas pipes, thus improving the burner's service life.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and in particular to a low-NOx burner. Background Technology

[0002] Nitrogen oxides (NO) X NOx, as one of the major air pollutants, causes a series of environmental problems such as acid rain and photochemical smog, seriously threatening the ecological environment and human health. NOx emissions from my country's industrial sector... X Emissions account for over 70% of total emissions, with coal-fired and gas-fired boilers and industrial kilns being the core sources. With the deepening implementation of the "dual-carbon" strategy and the continuous tightening of environmental regulations, policies such as the "Boiler Air Pollutant Emission Standard" have clearly required key areas to meet NOx emission standards. X With emission concentrations controlled below 30 mg / m³, and some regions even enforcing stringent limits of 15 mg / m³, traditional combustion equipment can no longer meet the compliance requirements, making low-NOx combustion technology the core path for industrial emission reduction. Low-NOx combustion technology has undergone multiple generations of development, resulting in various technical routes: the first generation of technology achieves low NOx emissions by adjusting operating parameters; although simple to retrofit, the emission reduction is limited; the second generation focuses on staged air combustion, suppressing NOx emissions by reducing the oxygen concentration in the main combustion zone. X The third-generation technology combines air and fuel staging to form a multi-stage combustion mode with reduction and burnout zones, significantly improving denitrification efficiency. Current mainstream technologies include flue gas recirculation (FGR), fully premixed combustion, and staged combustion. Among them, fully premixed technology is gradually becoming the preferred choice in the high-end market because it can stably achieve ultra-low emissions. However, core components are still highly dependent on imports, which restricts the performance improvement and cost optimization of domestically produced equipment.

[0003] Based on this, the present invention provides a low-NOx burner. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a low-NOx burner, comprising a burner support cylinder, which includes an insulated outer cylinder. A burner adjustment port is fixedly installed inside the insulated outer cylinder. A bottom support cylinder is fixedly installed at the bottom of the insulated outer cylinder, and a fuel supply unit is fixedly installed inside the bottom support cylinder. The fuel supply unit includes a pipe clamping plate, which is fixedly installed at the bottom of the bottom support cylinder. A pipe support rod is fixedly installed at the center of the pipe clamping plate. A fuel mixing trough is provided on the pipe clamping plate, and a fuel outlet is provided at the top of the fuel mixing trough. Multiple flue gas exhaust ports are provided within the inner ring of the fuel mixing trough. The flue gas outlet is connected to the fuel mixing tank. The top of the flue gas outlet is provided with a smoke opening. Multiple fuel pipes are fixedly connected to the bottom of the fuel mixing tank, and multiple flue gas pipes are fixedly connected to the bottom of the flue gas outlet. A mixing regulating plate is longitudinally rotatably installed on the top of the pipe clamping plate. A baffle is fixedly installed on the bottom of the mixing regulating plate. The baffle at the bottom of the mixing regulating plate is slidably installed between the fuel mixing tank and the flue gas outlet. A flue gas control valve is slidably installed inside the flue gas outlet. A triangular plate is provided on the flue gas control valve. The baffle at the bottom of the mixing regulating plate and the triangular plate on the flue gas control valve slide in cooperation.

[0005] Furthermore, a gear ring is fixedly installed on the outer ring of the mixing regulating disc, and an regulating motor is fixedly installed on the pipe clamping plate. A gear is fixedly installed on the regulating motor, and the gear on the regulating motor meshes with the gear ring on the mixing regulating disc.

[0006] Furthermore, a mixing fan blade is longitudinally rotatably installed on the top of the pipe support rod, and the mixing fan blade slides in cooperation with the pipe clamping plate. The fuel pipe and the flue gas pipe are fixedly installed on the bottom outer wall of the pipe support rod. Multiple coolant pipes are fixedly installed on the outer wall of the pipe support rod, and the coolant pipes are fixedly installed between the fuel pipe and the flue gas pipe. A heat-conducting bracket is fixedly installed at the bottom of the bottom support cylinder, and the heat-conducting bracket wraps around the coolant pipe, the fuel pipe and the flue gas pipe.

[0007] Furthermore, a flue gas return pipe is fixedly installed on the outer wall of the heat-insulating outer cylinder, and an annular flue gas filter is fixedly installed in the middle section of the outer side of the heat-insulating outer cylinder. The bottom of the flue gas return pipe is fixedly connected to the annular flue gas filter, and the top of the flue gas return pipe is fixed to the top of the heat-insulating outer cylinder and extends through the inner wall of the heat-insulating outer cylinder, protruding inside the heat-insulating outer cylinder. The annular flue gas filter is connected to the flue gas pipe.

[0008] Furthermore, the burner adjustment port includes a gas flow guide bracket, which has multiple arc-shaped gas discharge ports of different diameters. Multiple conical blocks of different diameters are fixedly installed on the top of the gas flow guide bracket, and the conical blocks are fixedly installed on the inner ring of the corresponding arc-shaped gas discharge ports. The burner adjustment port also includes a gas flow guide cover plate, which is longitudinally slidably installed inside the heat-insulating outer cylinder. The gas flow guide cover plate has a gas port, which corresponds to the arc-shaped gas discharge ports. A conical baffle is fixedly installed on the top of the gas port on the gas flow guide cover plate, and the conical baffle on the gas flow guide cover plate contacts and cooperates with the conical blocks on the arc-shaped gas discharge ports. A guide vane is fixedly installed on the top of the gas port on the gas flow guide cover plate.

[0009] Furthermore, a longitudinal hydraulic rod is fixedly installed between the gas flow guide cover and the inner wall of the heat insulation outer cylinder. The burner adjustment port includes a flue gas adjustment frame, which is longitudinally slidably installed on the top of the gas flow guide cover. A longitudinal hydraulic rod is fixedly installed between the flue gas adjustment frame and the heat insulation outer cylinder. An adjustment top block is fixedly installed at the bottom center of the flue gas adjustment frame. The bottom of the adjustment top block is conical. A distance limiting rod is fixedly installed on the outer wall of the bottom of the adjustment top block. An air outlet is fixedly installed at the center of the gas flow guide support. An air adjustment plate is laterally rotatably installed on the top of the air outlet. A torsion spring is fixedly installed between the air adjustment plate and the air outlet. The air adjustment plate slides in cooperation with the distance limiting rod at the bottom of the adjustment top block.

[0010] Furthermore, a smoke cone baffle is fixedly installed on the top of the heat-insulating outer cylinder, and the position of the smoke cone baffle is higher than the position where the flue gas return pipe extends out of the inner wall of the heat-insulating outer cylinder.

[0011] Furthermore, an annular flue gas filter is fixedly installed on the heat-insulating outer cylinder, and the annular flue gas filter is fixedly connected to the external fan and the air outlet.

[0012] Furthermore, the coolant pipe is connected to an external coolant pump, and the coolant pipe is also connected to an external gas pump.

[0013] The beneficial effects of this invention compared with the prior art are: (1) This invention can effectively reduce the temperature of the gas and flue gas and reduce the generation of nitrogen by cooperating with the coolant pipe and the heat-conducting bracket; (2) This invention can make the flue gas and gas mix more fully by using the space between the burner adjustment port and the fuel supply unit, while reducing the influence of the temperature of the combustion zone on the gas pipe and improving the service life of the burner; (3) This invention can adjust the direction of air output by adjusting the air adjustment plate and the adjustment top block, which can adjust the flow direction of the smoke generated by combustion, and at the same time control the height of the flame, thereby improving the controllability of the burner. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the top structure of the present invention.

[0015] Figure 2 This is a side view of the present invention.

[0016] Figure 3 This is a schematic diagram of the overall top structure of the present invention.

[0017] Figure 4 This is a schematic diagram of the overall bottom structure of the present invention.

[0018] Figure 5 This is a schematic diagram of a half-section of the burner support cylinder of the present invention.

[0019] Figure 6 This is a half-sectional structural diagram of the fuel supply unit of the present invention.

[0020] Figure 7 This is a half-section diagram of the burner adjustment port structure of the present invention.

[0021] Figure 8 This is a schematic diagram of the overall structure of the gas flow guide bracket of the present invention.

[0022] Figure 9 This is a schematic diagram of the bottom structure of the gas flow guide cover of the present invention.

[0023] Figure 10 This is a schematic diagram of the flue gas regulating frame structure of the present invention.

[0024] Figure 11 for Figure 6 Enlarged structural diagram at point A1.

[0025] Figure 12 for Figure 7 Enlarged structural diagram at point B1.

[0026] Reference numerals: 1-Burner support cylinder; 2-Burner adjustment port; 3-Fuel supply unit; 101-Insulated outer cylinder; 102-Flue gas return pipe; 103-Smoke cone baffle; 104-Air transmission pipe; 105-Annular flue gas filter; 106-Bottom support cylinder; 107-Heat-conducting bracket; 201-Flue gas adjustment bracket; 202-Adjustment top block; 203-Air adjustment plate; 204-Gas flow guide cover; 205-Gas flow guide bracket; 206-Arc-shaped gas exhaust port; 207-Air outlet; 301-Pipe support rod; 302-Mixing fan blade; 303-Pipe clamping plate; 304-Fuel outlet; 305-Fuel mixing tank; 306-Coolant pipe; 307-Fuel pipe; 308-Flue gas pipe; 309-Adjustment motor; 310-Mixing adjustment disc; 311-Flue gas exhaust port; 312-Flue gas control valve. Detailed Implementation

[0027] The technical solution provided by the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1-12 As shown, a low-NOx burner includes a burner support cylinder 1, which includes an insulated outer cylinder 101. A burner adjustment port 2 is fixedly installed inside the insulated outer cylinder 101. A bottom support cylinder 106 is fixedly installed at the bottom of the insulated outer cylinder 101. A fuel supply unit 3 is fixedly installed inside the bottom support cylinder 106. The fuel supply unit 3 includes a pipe clamping plate 303, which is fixedly installed at the bottom of the bottom support cylinder 106. A pipe support rod 301 is fixedly installed at the center of the pipe clamping plate 303. A fuel mixing tank 305 is provided on the pipe clamping plate 303. A fuel outlet 304 is provided at the top of the fuel mixing tank 305. The inner ring is equipped with multiple flue gas outlets 311, which are connected to the fuel mixing tank 305. These outlets are used to evenly mix the returned flue gas into the fuel gas, allowing it to be output synchronously with the fuel gas, thus diluting the air and oxygen content in the fuel gas. The top of each flue gas outlet 311 has a smoke opening for simultaneously outputting the returned flue gas and fuel gas, further diluting the air around the fuel gas and reducing the oxygen content. Multiple fuel pipes 307 are fixedly connected to the bottom of the fuel mixing tank 305, and these pipes are connected to an external fuel pump. Multiple flue gas pipes 308 are fixedly connected to the bottom of each flue gas outlet 311. A mixing regulating plate 310 is longitudinally rotatably mounted on the top of the pipe clamping plate 303. A baffle is fixedly installed at the bottom of the mixing regulating plate 310. The baffle at the bottom of the mixing regulating plate 310 is slidably installed between the fuel mixing tank 305 and the flue gas discharge port 311. A flue gas control valve 312 is slidably installed laterally inside the flue gas discharge port 311. A compression spring is fixedly installed between the flue gas control valve 312 and the flue gas discharge port 311. A triangular plate is provided on the flue gas control valve 312. The baffle at the bottom of the mixing regulating plate 310 slides in cooperation with the triangular plate on the flue gas control valve 312. A gear ring is fixedly installed on the outer ring of the mixing regulating plate 310. An regulating motor 309 is fixedly installed on the pipe clamping plate 303. A gear is fixedly installed on the regulating motor 309. The gear on plate 9 meshes with the gear ring on the mixing regulating plate 310. By starting the regulating motor 309, the mixing regulating plate 310 is driven to rotate on the pipe clamping plate 303, adjusting the position of the bottom baffle of the mixing regulating plate 310. When the bottom baffle of the mixing regulating plate 310 blocks the flue gas discharge port 311 and the fuel mixing tank 305, the flue gas control valve 312 slides in the flue gas discharge port 311 through the compression spring, opening the smoke opening at the top of the flue gas discharge port 311, allowing the flue gas to be discharged from the smoke opening. During the discharge of the gas, the gas is wrapped, reducing the air around the gas and preventing excessive mixing of the surrounding air into the gas, thus reducing the generation of nitrogen.

[0029] like Figures 1-12As shown, when the starting regulating motor 309 rotates in the reverse direction, it drives the mixing regulating disc 310 to rotate in the reverse direction, so that the baffle at the bottom of the mixing regulating disc 310 no longer blocks the space between the flue gas discharge port 311 and the fuel mixing tank 305. At the same time, it drives the flue gas control valve 312 to slide and close the smoke opening at the top of the flue gas discharge port 311, so that the flue gas and the fuel gas are mixed, reducing the flue gas concentration, lowering the temperature of the fuel gas during combustion, and reducing the generation of nitrogen.

[0030] like Figures 1-12 As shown, a flue gas return pipe 102 is fixedly installed on the outer wall of the heat-insulated outer cylinder 101, and an annular flue gas filter 105 is fixedly installed in the middle section of the outer side of the heat-insulated outer cylinder 101 for extracting flue gas and performing preliminary filtration of the flue gas. The bottom of the flue gas return pipe 102 is fixedly connected to the annular flue gas filter 105, and the top of the flue gas return pipe 102 is fixed to the top of the heat-insulated outer cylinder 101 and extends through the inner wall of the heat-insulated outer cylinder 101, protruding inside the heat-insulated outer cylinder 101 for absorbing... The flue gas generated during combustion is collected. The annular flue gas filter 105 is connected to the flue gas duct 308 to transport the flue gas to the fuel mixing tank 305 for mixing with the fuel gas. A smoke cone baffle 103 is fixedly installed on the top of the heat-insulated outer cylinder 101. The position of the smoke cone baffle 103 is higher than the position of the flue gas return duct 102 extending from the inner wall of the heat-insulated outer cylinder 101, so that the flue gas can be collected close to the inner wall of the heat-insulated outer cylinder 101 for collection by the flue gas return duct 102.

[0031] like Figures 1-12 As shown, a mixing blade 302 is longitudinally rotatably mounted on the top of the pipe support rod 301. The mixing blade 302 slides in conjunction with the pipe clamping plate 303. The mixing blade 302 is used to mix flue gas and fuel gas. When the fuel gas is transmitted to the heat-insulating outer cylinder 101 through the fuel pipe 307, the fuel gas drives the mixing blade 302 to rotate on the pipe support rod 301, thus fully mixing the oxygen-containing fuel gas. The fuel pipe 307 and the flue gas pipe 308 are fixedly installed on the bottom outer wall of the pipe support rod 301. Multiple coolant pipes 306 are fixedly installed on the outer wall of the pipe support rod 301. The coolant pipes 306 are connected to the external cooling system. A coolant pump is connected, and the coolant pipe 306 is fixedly installed between the fuel pipe 307 and the flue gas pipe 308. A heat-conducting bracket 107 is fixedly installed at the bottom of the bottom support cylinder 106. The heat-conducting bracket 107 is wrapped around the coolant pipe 306, the fuel pipe 307 and the flue gas pipe 308. Coolant is transferred into the coolant pipe 306 through an external liquid pump to reduce the temperature of the heat-conducting bracket 107. The heat-conducting bracket 107 also reduces the temperature of the fuel pipe 307 and the flue gas pipe 308, thereby reducing the temperature of the flue gas and fuel gas, further controlling the temperature of the flame, and preventing the flue gas temperature from being too high and affecting the service life of the pipes.

[0032] like Figures 1-12As shown, the burner regulating port 2 includes a gas flow guide bracket 205, which has multiple arc-shaped gas discharge ports 206 of different diameters. Multiple conical blocks of different diameters are fixedly installed on the top of the gas flow guide bracket 205, and these conical blocks are fixedly installed on the inner ring of the corresponding arc-shaped gas discharge ports 206. The burner regulating port 2 also includes a gas flow guide cover plate 204, which is longitudinally slidably installed inside the heat-insulating outer cylinder 101. The gas flow guide cover plate 204 has gas ports that correspond to the arc-shaped gas discharge ports 206. A conical baffle is fixedly installed on the top of the gas ports on the gas flow guide cover plate 204. The conical baffle on the gas flow guide cover plate 204 corresponds to the arc-shaped gas discharge ports 206. The conical stop on the gas exhaust port 206 engages with the conical baffle to control the opening and closing of the arc-shaped gas exhaust port 206. By activating the hydraulic rod between the gas guide cover 204 and the heat insulation outer cylinder 101, the distance between the gas guide cover 204 and the gas guide support 205 can be adjusted, thereby controlling the distance between the conical stop and the conical baffle. This adjusts the opening width of the arc-shaped gas exhaust port 206, regulates the gas flow rate, and controls the combustion efficiency. At the same time, the distance between the burner regulating port 2 and the fuel supply unit 3 provides sufficient space and time for the mixing of gas and flue gas, making the fuel mixture more uniform, while preventing the flame temperature during combustion from affecting the internal pipes of the fuel supply unit 3.

[0033] like Figures 1-12 As shown, a guide vane is fixedly installed on the top of the gas port on the gas flow guide cover 204. The guide vane is arranged in a spiral array. The guide vane is used to control the flow direction of the gas-flue mixture and further control the shape of the flame during combustion, so as to facilitate the collection of flue gas from the top of the flame.

[0034] like Figures 1-12As shown, a longitudinal hydraulic rod is fixedly installed between the gas flow guide cover 204 and the inner wall of the heat insulation outer cylinder 101. The burner adjustment port 2 includes a flue gas adjustment frame 201, which is longitudinally slidably installed on the top of the gas flow guide cover 204. A longitudinal hydraulic rod is fixedly installed between the flue gas adjustment frame 201 and the heat insulation outer cylinder 101. An adjustment top block 202 is fixedly installed at the bottom center of the flue gas adjustment frame 201. The bottom of the adjustment top block 202 is a conical surface, and a limit distance is fixedly installed on the outer wall of the bottom of the adjustment top block 202. An air outlet 207 is fixedly installed at the center of the gas flow guide bracket 205. An annular flue gas filter 105 is fixedly installed on the heat-insulating outer cylinder 101. The annular flue gas filter 105 is fixedly connected to an external fan and the air outlet 207. Air can be transmitted into the air outlet 207 through the external fan to regulate the combustion temperature and oxygen content of the flame. An air conditioning plate 203 is horizontally rotatably installed on the top of the air outlet 207. The air conditioning plate 203 is connected to the air outlet 207. A torsion spring is fixedly installed between the air outlet 207 and the gas outlet 207. The air regulating plate 203 slides in conjunction with the limiting rod at the bottom of the adjusting top block 202. The conical surfaces at the bottom of the air regulating plate 203 and the adjusting top block 202 are used to control the airflow direction. By activating the hydraulic rod between the flue gas regulating frame 201 and the heat insulation outer cylinder 101, the flue gas regulating frame 201 is driven to slide longitudinally on the gas flow guide cover 204. The limiting rod at the bottom of the adjusting top block 202 drives the air regulating plate 203 to slide at the air outlet 207. Rotate the air regulating plate 203 to change its angle, and adjust the direction of air output from the air outlet 207 by adjusting the angle of the air regulating plate 203. When the angle between the air regulating plate 203 and the air outlet 207 is close to a flat angle, the air flows towards the inner wall of the heat insulation outer cylinder 101, so that the air mixes into the combustion zone and blows the flue gas generated by combustion towards the inner wall of the heat insulation outer cylinder 101, so that the flue gas floats upward along the inner wall of the heat insulation outer cylinder 101, which is convenient for the collection of flue gas return pipe 102.

[0035] like Figures 1-12 As shown, when the angle between the air conditioning plate 203 and the air outlet 207 is close to a right angle, the air flows towards the top of the heat-insulating outer cylinder 101, so that the air mixes only with the center of the combustion zone, and blows the flue gas generated by combustion from the center of the heat-insulating outer cylinder 101 to the top, reducing the residual flue gas inside the heat-insulating outer cylinder 101. At the same time, the height of the flame can be adjusted as needed.

Claims

1. A low-NOx burner, comprising a burner support cylinder (1), the burner support cylinder (1) including a heat-insulating outer cylinder (101), a burner adjustment port (2) fixedly installed inside the heat-insulating outer cylinder (101), a bottom support cylinder (106) fixedly installed at the bottom of the heat-insulating outer cylinder (101), and a fuel supply unit (3) fixedly installed inside the bottom support cylinder (106), characterized in that, The fuel supply unit (3) includes a pipe clamping plate (303), which is fixedly installed at the bottom of the bottom support cylinder (106). A pipe support rod (301) is fixedly installed at the center of the pipe clamping plate (303). A fuel mixing tank (305) is provided on the pipe clamping plate (303). A fuel outlet (304) is provided at the top of the fuel mixing tank (305). Multiple flue gas outlets (311) are provided in the inner circle of the fuel mixing tank (305). The flue gas outlets (311) are connected to the fuel mixing tank (305). A smoke opening is provided at the top of the flue gas outlets (311). The bottom of the fuel mixing tank (305) is fixedly connected to a... Multiple fuel pipes (307) are fixedly connected to the bottom of the flue gas outlet (311) and multiple flue gas pipes (308). A mixing regulating plate (310) is longitudinally rotated and installed on the top of the pipe clamping plate (303). A baffle is fixedly installed on the bottom of the mixing regulating plate (310). The baffle at the bottom of the mixing regulating plate (310) is slidably installed between the fuel mixing tank (305) and the flue gas outlet (311). A flue gas control valve (312) is slidably installed in the flue gas outlet (311). A triangular plate is provided on the flue gas control valve (312). The baffle at the bottom of the mixing regulating plate (310) and the triangular plate on the flue gas control valve (312) are slidably engaged.

2. A low-NOx burner according to claim 1, characterized in that, A gear ring is fixedly installed on the outer ring of the mixing regulating plate (310), and an regulating motor (309) is fixedly installed on the pipe clamping plate (303). A gear is fixedly installed on the regulating motor (309), and the gear on the regulating motor (309) meshes with the gear ring on the mixing regulating plate (310).

3. A low-NOx burner according to claim 1, characterized in that, The top of the pipe support rod (301) is longitudinally rotatably mounted with a mixing fan blade (302), which slides with the pipe clamping plate (303). The fuel pipe (307) and the flue gas pipe (308) are fixedly installed on the bottom outer wall of the pipe support rod (301). Multiple coolant pipes (306) are fixedly installed on the outer wall of the pipe support rod (301). The coolant pipes (306) are fixedly installed between the fuel pipe (307) and the flue gas pipe (308). The bottom support cylinder (106) is fixedly mounted with a heat-conducting bracket (107), which wraps around the coolant pipe (306), the fuel pipe (307), and the flue gas pipe (308).

4. A low-NOx burner according to claim 1, characterized in that, A flue gas return pipe (102) is fixedly installed on the outer wall of the heat-insulating outer cylinder (101). An annular flue gas filter (105) is fixedly installed in the middle section of the outer side of the heat-insulating outer cylinder (101). The bottom of the flue gas return pipe (102) is fixedly connected to the annular flue gas filter (105). The top of the flue gas return pipe (102) is fixed to the top of the heat-insulating outer cylinder (101) and extends through the inner wall of the heat-insulating outer cylinder (101) and extends inside the heat-insulating outer cylinder (101). The annular flue gas filter (105) is connected to the flue gas pipe (308).

5. A low-NOx burner according to claim 1, characterized in that, The burner adjustment port (2) includes a gas flow guide bracket (205), which has multiple arc-shaped gas discharge ports (206) of different diameters. Multiple conical blocks of different diameters are fixedly installed on the top of the gas flow guide bracket (205), and the conical blocks are fixedly installed on the inner ring of the corresponding arc-shaped gas discharge ports (206). The burner adjustment port (2) includes a gas flow guide cover plate (204), which is longitudinally slidably installed on the gas flow guide cover plate (204). Inside the heat-insulating outer cylinder (101), a gas outlet is provided on the gas flow guide cover (204). The gas outlet on the gas flow guide cover (204) corresponds to the arc-shaped gas discharge port (206). A conical baffle is fixedly installed on the top of the gas outlet on the gas flow guide cover (204). The conical baffle on the gas flow guide cover (204) contacts and cooperates with the conical block on the arc-shaped gas discharge port (206). A guide vane is fixedly installed on the top of the gas outlet on the gas flow guide cover (204).

6. A low-NOx burner according to claim 5, characterized in that, A longitudinal hydraulic rod is fixedly installed between the gas flow guide cover (204) and the inner wall of the heat insulation outer cylinder (101). The burner adjustment port (2) includes a flue gas adjustment frame (201). The flue gas adjustment frame (201) is longitudinally slidably installed on the top of the gas flow guide cover (204). A longitudinal hydraulic rod is fixedly installed between the flue gas adjustment frame (201) and the heat insulation outer cylinder (101). An adjustment top block (202) is fixedly installed at the bottom center of the flue gas adjustment frame (201). The bottom of the adjustment top block (202) is conical. A distance rod is fixedly installed on the outer wall of the bottom of the adjustment top block (202). An air outlet (207) is fixedly installed at the center of the gas flow guide bracket (205). An air adjustment plate (203) is horizontally rotated and installed on the top of the air outlet (207). A torsion spring is fixedly installed between the air adjustment plate (203) and the air outlet (207). The air adjustment plate (203) slides in cooperation with the distance rod at the bottom of the adjustment top block (202).

7. A low-NOx burner according to claim 1, characterized in that, A smoke cone baffle (103) is fixedly installed on the top of the heat-insulating outer cylinder (101). The position of the smoke cone baffle (103) is higher than the position where the flue gas return pipe (102) extends out of the inner wall of the heat-insulating outer cylinder (101).

8. A low-NOx burner according to claim 6, characterized in that, An annular flue gas filter (105) is fixedly installed on the heat-insulating outer cylinder (101). The annular flue gas filter (105) is fixedly connected to the external fan and to the air outlet (207).

9. A low-NOx burner according to claim 1, characterized in that, The coolant pipe (306) is connected to an external coolant pump, and the coolant pipe (306) is connected to an external gas pump.

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