An air distribution structure for a low-NOx burner used in a natural gas dryer and its application method.

Abstract

This invention discloses an air distribution structure and its usage method for a low-NOx burner used in a natural gas drying furnace, comprising: an air duct with a first air inlet and a second air inlet welded to its outer surface; a ventilation pipe with its left end screwed to a connecting ring; a fuel inlet pipe connected to a fuel delivery pipe; a motor; a fixed cylinder with a first air port and a second air port on its side; an air pump with a rotating shaft passing through the fixed cylinder and an adjusting cylinder and connected to the air pump; a fuel outlet pipe with its right end inserted into a cyclone chamber; a cyclone chamber with its constricted section facing a baffle; and a baffle. This air distribution structure and usage method for the low-NOx burner in a natural gas drying furnace utilizes the rotation of the adjusting cylinder to change the overlap range between the air inlet and the ventilation port, thereby altering the ratio of incoming air to flue gas. This avoids the need for independent adjustment of the two using a fan and damper. A turntable drives the inclined tube to rotate, causing the inclined tube to collide with a baffle rod, reducing blockage through vibration.

Description

Technical Field

[0001] This invention relates to the technical field of low-NOx burners, specifically to an air distribution structure for a low-NOx burner used in a natural gas drying furnace and its usage method. Background Technology

[0002] Air is indispensable in the combustion process of a boiler. Nitrogen accounts for approximately 78% of the air. Under high-temperature conditions, nitrogen reacts with oxygen to produce nitrogen oxides, causing environmental pollution. Low-NOx burners are devices that integrate traditional burners with the addition of blowers, induced draft fans, frequency converters, control valves, and multiple circuits to provide more efficient thermal energy to the boiler through clean energy and burner operation.

[0003] In existing technologies, the air distribution structure of low-NOx burners typically uses cyclones to generate vortex motion in the gas, enhancing gas mixing, making combustion more complete, and reducing the generation of nitrogen oxides. However, as the intensity of the swirl increases, the gas backflow range expands, leading to backfire problems and easily damaging the burner head structure. Moreover, due to the poor quality of existing natural gas, there are many impurities after combustion, which can easily clog gas pipelines. Summary of the Invention

[0004] To fill a market gap, this invention provides an air distribution structure for a low-NOx burner used in a natural gas drying furnace and its usage method.

[0005] The purpose of this invention is to provide an air distribution structure and its usage method for a low-NOx burner in a natural gas dryer, in order to solve the problems mentioned in the background art. In the prior art, the air distribution structure of low-NOx burners usually uses a cyclone separator to generate vortex motion of gas, which enhances the gas mixing effect, makes combustion more complete, and reduces the generation of nitrogen oxides. However, as the cyclone intensity increases, the gas backflow range expands, leading to backfire problems, which can easily damage the burner head structure. Moreover, due to the poor quality of existing natural gas, there are more impurities after combustion, which can easily clog the gas pipeline.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an air distribution structure for a low-NOx burner in a natural gas drying furnace, comprising:

[0007] The air duct has a first air inlet and a second air inlet welded on its outer side. A fixed cylinder is screwed into the inside of the air duct, and a partition is welded between the air duct and the fixed cylinder.

[0008] The ventilation duct has its left end screwed to a connecting ring, and its right end fitted with an expansion section. A cyclone is nested inside the ventilation duct.

[0009] The fuel inlet pipe is connected to the fuel delivery pipe, and the other end of the fuel delivery pipe is connected to the fuel outlet pipe.

[0010] The motor is fixed to the partition by a bracket, and the motor is connected to the rotating shaft by a transmission belt.

[0011] The fixed cylinder has a first air port and a second air port on its side. The inner wall of the fixed cylinder is connected to the outer side of the adjusting cylinder. The left end face of the fixed cylinder is provided with a sliding groove and a sliding rail.

[0012] An air pump is connected to a rotating shaft that passes through a fixed cylinder and an adjusting cylinder. A connecting rod is inserted into the end of the rotating shaft, and the connecting rod passes through a turntable. An inclined tube is inserted into the turntable.

[0013] Fuel outlet pipe, the right end of the fuel outlet pipe is inserted into the cyclone chamber, and air nozzles are evenly welded around the left end of the fuel outlet pipe;

[0014] The cyclone has a constricted section facing the baffle. An extension box is connected to the left end face of the cyclone, and a side air vent is opened on the extension box.

[0015] A baffle is provided, with an auxiliary injection pipe and a main injection pipe inserted into it. The auxiliary injection pipe surrounds the main injection pipe, and the baffle is located near the expansion section.

[0016] Furthermore, a connecting ring is screwed to the outer side of the right end plate of the air duct, and a fixed cylinder is screwed to the inner side of the right end plate of the air duct. A partition separates the annular area between the air duct and the fixed cylinder to form an installation chamber, an air chamber, a sludge collection chamber and a flue gas chamber. The air chamber and the flue gas chamber are respectively connected to the first air inlet and the second air inlet.

[0017] Furthermore, the installation chamber and the sludge collection chamber are symmetrically distributed about the fixed cylinder. The motor is fixed inside the installation chamber, and the discharge nozzle is welded to the fixed cylinder inside the sludge collection chamber.

[0018] Furthermore, the first air inlet and the second air inlet face the flue gas chamber and the air chamber respectively. The first ventilation port and the second ventilation port are symmetrically opened on the side of the regulating cylinder. The first ventilation port and the second ventilation port correspond to the first air inlet and the second air inlet respectively. A plug is welded to the left end face of the regulating cylinder, and a turntable is rotatably installed at the right end of the regulating cylinder.

[0019] Furthermore, the insert penetrates the slide groove, a gear is fitted on the insert, and the gear meshes with the slide rail, and teeth are provided on the inner arc surface of the slide rail.

[0020] Furthermore, connecting rods and fuel outlet pipes are connected to both sides of the turntable, and a mixing chamber is formed between the turntable and the regulating cylinder. The mixing chamber is connected to the inclined pipe, which passes through the turntable and extends into the ventilation pipe. The inclined pipe is connected to the baffle rod, which is embedded in the air duct.

[0021] Furthermore, the fuel outlet pipe connects the fuel delivery pipe and the cyclone chamber. The right end of the fuel outlet pipe has a frustum structure, and air nozzles inclined towards the pipe wall are welded at equal intervals on the frustum side of the fuel outlet pipe.

[0022] Furthermore, a cyclone chamber is formed inside the cyclone tube, and the extension box has a fan-shaped ring box structure. The extension box is symmetrical about the center of the fuel outlet pipe, and a side air vent is opened on one side of the extension box, which connects to the cyclone chamber.

[0023] A method of using an air distribution structure for a low-NOx burner in a natural gas drying furnace includes the following steps:

[0024] S1. Air, flue gas and fuel gas are respectively connected to the first air inlet, the second air inlet and the fuel inlet pipe. Air and flue gas enter the air chamber and the flue gas chamber respectively. The fuel gas is injected into the fuel delivery pipe.

[0025] S2. Rotate the regulating cylinder to adjust the air inlet range, start the air pump, so that the gas in the air chamber and the flue gas chamber enter the mixing chamber in proportion for mixing, and the mixed gas flows into the ventilation pipe through the inclined pipe.

[0026] S3. The mixed gas enters the cyclone chamber through the side air inlet, and the fuel gas enters the cyclone chamber through the air nozzle. The two meet and are mixed a second time.

[0027] S4. The gas in the cyclone chamber is ejected outward through the auxiliary injection pipe and the main injection pipe, and then ignited by the ignition device and burned.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: The air distribution structure and usage method of the low-NOx burner for natural gas drying furnace utilizes the rotation of the regulating cylinder to change the overlap range of the gas inlet and the ventilation outlet, thereby changing the ratio of incoming air and flue gas, avoiding the use of fans and dampers to independently adjust the two. The turntable drives the inclined tube to rotate, causing the inclined tube to collide with the baffle rod, reducing blockage through vibration. At the same time, the inclined tube enhances the gas mixing effect. The rotating inclined rod cooperates with the cyclone tube with side air outlets to enhance the gas swirling effect in the cyclone chamber. Meanwhile, the air nozzle generates a reverse fuel swirling flow, which not only improves the mixing effect but also effectively avoids backfire.

[0029] 1. The connecting rod connects the rotating shaft and the turntable, so that the turntable rotates during the operation of the air pump, controls the rotation and ejection of gas, and enhances the airflow disturbance in the mixing chamber, so that the gas is fully mixed.

[0030] 2. By utilizing the constricted section of the cyclone tube, the velocity of the ejected air path is increased, which, in conjunction with the main injection pipe and the radial injection pipe, achieves the flame splitting effect;

[0031] 3. When flue gas mixes with air, the flue gas temperature decreases. The cooled gas is prone to condensation. The inclined pipe and discharge nozzle facilitate the discharge of moisture from the mixing chamber, avoiding problems such as flue gas condensate corrosion and surge. Attached Figure Description

[0032] Figure 1 This is a front view schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a front cross-sectional view of the structure of the present invention;

[0034] Figure 3 This is a side cross-sectional view of the cyclone tube structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the cyclone tube structure of the present invention;

[0036] Figure 5 The structure of the present invention Figure 2 Enlarged view of a portion of the image;

[0037] Figure 6 This is a schematic diagram of the left-side cross-sectional view of the air duct structure of the present invention;

[0038] Figure 7 This is a schematic cross-sectional view of the air duct structure of the present invention from the right side.

[0039] In the diagram: 1. Air duct; 2. Ventilation pipe; 3. Fuel inlet pipe; 4. Motor; 5. Fixed cylinder; 6. Air pump; 7. Fuel outlet pipe; 8. Cyclone separator; 9. Baffle; 11. First air inlet; 12. Second air inlet; 13. Partition; 14. Installation chamber; 15. Air chamber; 16. Sludge collection chamber; 17. Flue gas chamber; 21. Expansion section; 22. Connecting ring; 31. Fuel delivery pipe; 41. Drive belt; 42. Support; 51. First 52. Second air inlet; 53. Adjusting cylinder; 54. First ventilation opening; 55. Second ventilation opening; 56. Discharge nozzle; 57. Slide chute; 58. Insert column; 59. Slide rail; 61. Rotating shaft; 62. Mixing chamber; 63. Connecting rod; 64. Turntable; 65. Inclined pipe; 66. Stop bar; 71. Air nozzle; 81. Extension box; 82. Side air outlet; 83. Cyclone chamber; 84. Narrowing section; 91. Auxiliary injection pipe; 92. Main injection pipe. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Detailed implementation method one: Please refer to Figure 1-7 This invention provides a technical solution: an air distribution structure for a low-NOx burner in a natural gas drying furnace, comprising:

[0042] The air duct 1 has a first air inlet 11 and a second air inlet 12 welded on its outer side. A fixed cylinder 5 is screwed into the inside of the air duct 1, and a partition 13 is welded between the air duct 1 and the fixed cylinder 5.

[0043] Ventilation pipe 2, the left end of ventilation pipe 2 is screwed together with connecting ring 22, the right end of ventilation pipe 2 is sleeved with expansion section 21, and a cyclone tube 8 is nested inside ventilation pipe 2;

[0044] Fuel inlet pipe 3 is connected to fuel delivery pipe 31, and the other end of fuel delivery pipe 31 is connected to fuel outlet pipe 7.

[0045] Motor 4 is fixed on partition 13 by bracket 42, and motor 4 is rotatably connected to shaft 61 by transmission belt 41;

[0046] The fixed cylinder 5 has a first air port 51 and a second air port 52 on its side. The inner wall of the fixed cylinder 5 is connected to the outer side of the adjusting cylinder 53. The left end face of the fixed cylinder 5 is provided with a sliding groove 57 and a sliding rail 59.

[0047] Air pump 6, rotating shaft 61 passes through fixed cylinder 5 and adjusting cylinder 53 and is connected to air pump 6. A connecting rod 63 is inserted into the end of rotating shaft 61. The connecting rod 63 passes through turntable 64. An inclined tube 65 is inserted into turntable 64.

[0048] Fuel outlet pipe 7, the right end of fuel outlet pipe 7 is inserted into cyclone chamber 83, and air nozzles 71 are evenly welded around the left end of fuel outlet pipe 7.

[0049] Cyclone 8, the constricted section 84 of cyclone 8 faces the baffle 9, an extension box 81 is connected to the left end face of cyclone 8, and a side air vent 82 is opened on the extension box 81.

[0050] Baffle 9, on which an auxiliary injection pipe 91 and a main injection pipe 92 are inserted. The auxiliary injection pipe 91 surrounds the main injection pipe 92. Baffle 9 is close to the expansion section 21.

[0051] When using the air distribution structure of the low-NOx burner for the natural gas drying furnace, the air duct and flue gas duct are connected to the first air inlet 11 and the second air inlet 12, respectively. The motor 4 drives the rotating shaft 61 to rotate via the transmission belt 41. The rotating shaft 61 drives the air pump 6, causing the gas in the air chamber 15 and the flue gas chamber 17 to enter the mixing chamber 62 through the air inlet and the ventilation opening. The gas in the mixing chamber 62 is mixed and sprayed out from the inclined pipe 65. The gear is rotated by rotating the insert 58. The gear rotates along the slide rail 59, causing the regulating cylinder 53 to rotate. The overlap range of the ventilation opening on the regulating cylinder 53 and the air inlet on the fixed cylinder 5 changes. Since the overlap range of the ventilation opening and air inlet on both sides of the air chamber 15 and the flue gas chamber 17 changes in opposite directions, it is convenient to achieve different ratios of air and flue gas mixing. The rotating shaft 61 drives... The connecting rod 63 and the turntable 64 rotate, causing the inclined tube 65 to rotate and continuously contact the stop bar 66. The inclined tube 65 vibrates, and when the mixed gas passes through the inclined tube 65, impurities and moisture on the inclined tube 65 fall off due to the vibration. When the vent moves directly above the discharge nozzle 56, the moisture in the mixing chamber 62 is discharged from the discharge nozzle 56. The mixed gas enters the cyclone 8 through the side air vent 82. The mixed gas rotates into the cyclone chamber 83 to form a vortex. The fuel passes through the fuel inlet pipe 3, the fuel delivery pipe 31, and the fuel outlet pipe 7, and is finally sprayed out from the air nozzle 71. The mixed gas and the fuel gas in the cyclone chamber 83 swirl in opposite directions, enhancing the uniform mixing of the fuel gas and the mixed gas. The mixed gas is sprayed out from the constriction section 84 and finally sprayed through the auxiliary injection pipe 91 and the main injection pipe 92. The gas is ignited by the ignition device.

[0052] Specific Implementation Method Two: This implementation method is a further limitation of Specific Implementation Method One, such as... Figure 1 , Figure 2 and Figure 6 As shown, a connecting ring 22 is screwed to the outer side of the right end plate of the air duct 1, and a fixed cylinder 5 is screwed to the inner side of the right end plate of the air duct 1. A partition plate 13 separates the annular area between the air duct 1 and the fixed cylinder 5 to form an installation chamber 14, an air chamber 15, a dirt collection chamber 16, and a flue gas chamber 17. The air chamber 15 and the flue gas chamber 17 are respectively connected to the first air inlet 11 and the second air inlet 12. The air chamber 15 and the flue gas chamber 17 are symmetrical about the fixed cylinder 5, which facilitates the intake of air and flue gas into the mixing chamber 62 by an air pump 6.

[0053] Specific Implementation Method Three: This implementation method is a further limitation of Specific Implementation Method Two, such as... Figure 6 and Figure 7 As shown, the installation chamber 14 and the sludge collection chamber 16 are symmetrically distributed about the fixed cylinder 5. The motor 4 is fixed inside the installation chamber 14. The discharge nozzle 56 is welded on the fixed cylinder 5 inside the sludge collection chamber 16. The water and impurities in the fixed cylinder 5 are discharged into the sludge collection chamber 16 through the discharge nozzle 56.

[0054] Specific Implementation Method Four: This implementation method is a further limitation of Specific Implementation Method One. The first air inlet 51 and the second air inlet 52 face the flue gas chamber 17 and the air chamber 15, respectively. The first ventilation port 54 and the second ventilation port 55 are symmetrically opened on the side of the regulating cylinder 53. The first ventilation port 54 and the second ventilation port 55 correspond to the first air inlet 51 and the second air inlet 52, respectively. A plug 58 is fused to the left end face of the regulating cylinder 53. A turntable 64 is rotatably installed at the right end of the regulating cylinder 53. When the regulating cylinder 53 and the fixed cylinder 5 are in the position of Figure 6 When in position, air and flue gas are input into the mixing chamber 62 in a one-to-one ratio to achieve a single mixing effect. The first ventilation port 54 and the second ventilation port 55 are symmetrical about the center of the circle, while the first air inlet 51 and the second air inlet 52 are symmetrical about the center of the circle.

[0055] Specific Implementation Method Five: This implementation method is a further limitation of Specific Implementation Method Four, such as... Figure 5 and Figure 7 As shown, the insert 58 passes through the slide groove 57, and a gear is mounted on the insert 58. The gear meshes with the slide rail 59. Teeth are provided on the inner arc surface of the slide rail 59. A motor is installed at the port of the insert 58 (not shown in the figure). The motor drives the insert 58 and the gear to rotate. The gear moves along the arc-shaped slide rail 59, changing the overlap range between the adjusting cylinder 53 and the fixed cylinder 5. At this time, the overlap between the air inlets and ventilation outlets on both sides changes, achieving the effect of mixing air in different proportions.

[0056] Specific Implementation Method Six: This implementation method is a further limitation of Specific Implementation Method Four. The two sides of the turntable 64 are respectively connected to the connecting rod 63 and the fuel outlet pipe 7. The turntable 64 and the regulating cylinder 53 form a mixing chamber 62. The mixing chamber 62 is connected to the inclined pipe 65. The inclined pipe 65 passes through the turntable 64 and extends into the ventilation pipe 2. At the junction of the inclined pipe 65 and the baffle 66, the baffle 66 is embedded in the air duct 1. The inclined pipe 65 and the baffle 66 collide, causing the inclined pipe 65 to vibrate, thus preventing the inclined pipe 65 from becoming blocked.

[0057] Specific Implementation Method Seven: This implementation method is a further limitation of Specific Implementation Method One. The fuel outlet pipe 7 is connected to the fuel delivery pipe 31 and the cyclone chamber 83. The right end of the fuel outlet pipe 7 is a frustum structure, and the frustum side of the fuel outlet pipe 7 is welded with air nozzles 71 that are inclined toward the pipe wall at equal intervals. When the fuel outlet pipe 7 rotates, the inclined air nozzles 71 spray gas, so that the gas generates airflow in the cyclone chamber 83.

[0058] Specific Implementation Method Eight: This implementation method is a further limitation of Specific Implementation Method One, such as... Figure 2 and Figure 4As shown, a cyclone chamber 83 is formed inside the cyclone tube 8. The extension box 81 has a fan-shaped ring box structure. The extension box 81 is symmetrical about the center of the fuel outlet pipe 7. A side air vent 82 is opened on one side of the extension box 81. The side air vent 82 is connected to the cyclone chamber 83. The side air vent 82 is used to enhance the cyclone intensity entering the cyclone tube 8 and improve the gas mixing effect.

[0059] Specific Implementation Method Nine: A method for using an air distribution structure for a low-NOx burner in a natural gas drying furnace, comprising the following steps:

[0060] S1. Air, flue gas and fuel gas are respectively connected to the first air inlet 11, the second air inlet 12 and the fuel inlet pipe 3. Air and flue gas enter the air chamber 15 and the flue gas chamber 17 respectively. The fuel gas is injected into the fuel delivery pipe 31.

[0061] S2. Rotate the regulating cylinder 53 to adjust the air port range, start the air pump 6, so that the gas in the air chamber 15 and the flue gas chamber 17 enter the mixing chamber 62 in proportion to mix, and the mixed gas flows into the ventilation pipe 2 through the inclined pipe 65.

[0062] S3. The mixed gas enters the cyclone chamber 83 through the side air outlet 82, and the fuel gas enters the cyclone chamber 83 through the air nozzle 71. The two meet and are mixed a second time.

[0063] S4. The gas in the cyclone chamber 83 is ejected outward through the auxiliary injection pipe 91 and the main injection pipe 92, and then ignited by the ignition device.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air distribution structure for a low-NOx burner in a natural gas drying furnace, characterized in that, include: The air duct (1) has a first air inlet (11) and a second air inlet (12) welded on its outer side. The air duct (1) has a fixed cylinder (5) screwed inside. The air duct (1) has a connecting ring (22) screwed on the outer side of its right end plate. A partition (13) is welded between the air duct (1) and the fixed cylinder (5). Ventilation pipe (2), the left end of which is screwed together with connecting ring (22), the right end of which is fitted with expansion section (21), and the interior of ventilation pipe (2) is nested with cyclone tube (8); the partition (13) separates the annular area between the air tube (1) and the fixed tube (5) to form installation chamber (14), air chamber (15), sludge collection chamber (16) and flue gas chamber (17), the air chamber (15) and the flue gas chamber (17) are respectively connected to the first air inlet (11) and the second air inlet (12); Fuel inlet pipe (3), the fuel inlet pipe (3) is connected to fuel delivery pipe (31), and the other end of the fuel delivery pipe (31) is connected to fuel outlet pipe (7). The motor (4) is fixed on the partition (13) by the bracket (42), and the motor (4) is rotatably connected to the shaft (61) by the transmission belt (41). The fixed cylinder (5) has a first air port (51) and a second air port (52) on its side. The inner wall of the fixed cylinder (5) is connected to the outer side of the adjusting cylinder (53). The left end face of the fixed cylinder (5) is provided with a sliding groove (57) and a sliding rail (59). An air pump (6) is connected to a rotating shaft (61) that passes through a fixed cylinder (5) and an adjusting cylinder (53). A connecting rod (63) is inserted into the end of the rotating shaft (61), and the connecting rod (63) passes through a turntable (64). An inclined tube (65) is inserted into the turntable (64). The first air port (51) and the second air port (52) face the flue gas chamber (17) and the air chamber (15) respectively. A first ventilation port (54) and a second ventilation port (55) are symmetrically opened on the side of the adjusting cylinder (53). The first ventilation port (54) and the second ventilation port (55) correspond to the first air port (51) and the second ventilation port (52) respectively. 1) The second air inlet (52) has a plug (58) welded to the left end face of the regulating cylinder (53), and a turntable (64) is rotatably installed at the right end of the regulating cylinder (53); the two sides of the turntable (64) are respectively connected to the connecting rod (63) and the fuel outlet pipe (7), and the turntable (64) and the regulating cylinder (53) form a mixing chamber (62) around each other. The mixing chamber (62) is connected to the inclined pipe (65), and the inclined pipe (65) passes through the turntable (64) and extends into the ventilation pipe (2). The inclined pipe (65) is connected to the baffle (66), and the baffle (66) is embedded in the air duct (1). The insert (58) passes through the slide groove (57), and a gear is fitted on the insert (58), which meshes with the slide rail (59). The inner arc surface of the slide rail (59) is provided with teeth. Fuel outlet pipe (7), the right end of which is inserted into cyclone chamber (83), and air nozzles (71) are uniformly welded around the right port of fuel outlet pipe (7). Cyclone tube (8), the constricted section (84) of the cyclone tube (8) faces the baffle (9), an extension box (81) is connected to the left end face of the cyclone tube (8), and a side air vent (82) is opened on the extension box (81); a cyclone chamber (83) is formed inside the cyclone tube (8), the extension box (81) has a fan-shaped ring box structure, the extension box (81) is symmetrical about the center of the fuel outlet pipe (7), and the side air vent (82) is connected to the cyclone chamber (83). A baffle (9) is provided with an auxiliary injection pipe (91) and a main injection pipe (92) inserted on the baffle (9). The auxiliary injection pipe (91) surrounds the main injection pipe (92). The baffle (9) is close to the expansion section (21).

2. The air distribution structure for a low-NOx burner in a natural gas drying furnace according to claim 1, characterized in that: The installation chamber (14) and the sludge collection chamber (16) are symmetrically distributed about the fixed cylinder (5). The motor (4) is fixed inside the installation chamber (14), and the discharge nozzle (56) is welded to the fixed cylinder (5) inside the sludge collection chamber (16).

3. The air distribution structure for a low-NOx burner in a natural gas drying furnace according to claim 2, characterized in that: The fuel outlet pipe (7) connects the fuel delivery pipe (31) and the cyclone chamber (83). The right end of the fuel outlet pipe (7) is a frustum structure, and air nozzles (71) inclined toward the pipe wall are welded at equal intervals on the frustum side of the fuel outlet pipe (7).

4. A method of using the air distribution structure for a low-NOx burner in a natural gas drying furnace according to any one of claims 1-3, characterized in that, Includes the following steps: S1. Air, flue gas and fuel gas are respectively connected to the first air inlet (11), the second air inlet (12) and the fuel inlet pipe (3). Air and flue gas enter the air chamber (15) and the flue gas chamber (17) respectively. The fuel gas is injected into the fuel delivery pipe (31). S2. Rotate the regulating cylinder (53) to adjust the air port range, start the air pump (6), so that the gas in the air chamber (15) and the flue gas chamber (17) enter the mixing chamber (62) in proportion to mix, and the mixed gas flows into the ventilation pipe (2) through the inclined pipe (65). S3. The mixed gas enters the cyclone chamber (83) through the side air outlet (82) and the fuel gas enters the cyclone chamber (83) through the air nozzle (71). The two meet and are mixed a second time. S4. The gas in the cyclone chamber (83) is ejected outward through the auxiliary injection pipe (91) and the main injection pipe (92), and then ignited by the ignition device.

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