Low air-fuel ratio roller kiln burner

Abstract

The present application belongs to the technical field of burners, and particularly relates to a low air-fuel ratio roller kiln burner. The low air-fuel ratio roller kiln burner of the present application is characterized in that: the fuel gas jet delivered by the fuel gas delivery hole in the premixed gas delivery part is premixed with the primary air delivered by the air distribution chamber in a premixing chamber to form uniform premixed gas, and under the cooperation of the conical flow guide diffuser and the primary premixed gas annular nozzle, a conical thin film-shaped primary premixed jet is formed to improve the flame rigidity and the combustion stability; meanwhile, the secondary air jet is sprayed out by the secondary air nozzle of the air delivery fan disc arranged in an inclined manner at a specific angle to intersect with the primary premixed jet to form a multi-stage stable flame vortex, thereby prolonging the mixing path, ensuring sufficient combustion under low air-fuel ratio, reducing the flue gas heat loss, and improving the energy efficiency; the multi-stage vortex strengthens the anti-coking performance, reduces the carbon deposition and the cleaning frequency of the kiln, and ensures the production continuity; the present application comprehensively solves the problems of high flue gas heat loss, easy coking and shutdown, poor pressure adaptability and the like of the traditional burners, and greatly reduces the decoking frequency.

Description

Technical Field

[0001] This invention belongs to the field of burner technology, specifically relating to low air-fuel ratio roller kiln burners. Background Technology

[0002] In the production cost structure of roller kilns in the ceramic industry, fuel expenditure accounts for as much as 60% to 80%, and its price fluctuations have a decisive impact on the profitability of enterprises. Currently, the commonly used traditional burners face several technical bottlenecks under low excess air coefficient (α<1) conditions: on the one hand, incomplete combustion leads to weakened flame rigidity and decreased stability, while also increasing flue gas heat loss and reducing energy efficiency; on the other hand, the system's anti-coking performance is insufficient, easily causing carbon buildup in the fire tubes, forcing frequent kiln shutdowns for cleaning, severely restricting the continuity and stability of production. Furthermore, these burners have poor adaptability to changes in combustion air pressure, especially at ultra-low pressures (such as below 500 Pa), making it difficult to maintain stable combustion, thus limiting the potential for further energy-saving optimization of the kiln system. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems of incomplete combustion of fuel gas, resulting in poor flame rigidity and easy carbon accumulation in existing roller kiln burners under low excess air conditions, and to provide a low air-fuel ratio roller kiln burner that achieves complete combustion under low excess air conditions.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The low air-fuel ratio roller kiln burner includes an igniter, an air delivery pipe, a premixed gas delivery section, and an air delivery fan.

[0006] The air delivery pipe has an air delivery channel located on the inner side, and the outer end of the air delivery channel opens to form a flame nozzle.

[0007] The premixed gas delivery unit is located within the air delivery channel. It includes an air distribution chamber at the inner end, a premixing chamber located outside the air distribution chamber with an open outer end, and a conical guide diffuser. The inner side of the air distribution chamber has an air delivery hole that communicates with the air delivery channel. The premixed gas delivery unit has several axially arranged gas delivery holes and a gas annular mixing chamber surrounding the outer side of the air distribution chamber. Each gas delivery hole is connected to the premixing chamber through the gas annular mixing chamber, and the outer ends of each gas delivery hole are interconnected through the gas annular mixing chamber. The conical guide diffuser is located inside the premixing chamber and is concentrically arranged with the air distribution chamber. The outer diameter of the conical guide diffuser gradually increases in the outer direction. A primary premixed gas annular nozzle is formed between the inner circumference of the premixing chamber opening and the outer circumference of the bottom of the conical guide diffuser.

[0008] An air conveying fan is connected around the outer periphery of the premixed gas conveying section and has several secondary air nozzles arranged at an angle along the center line of the premixed gas conveying section.

[0009] The gas delivery hole is used to transport the gas jet axially through the gas annular mixing chamber and then to the premixing chamber. After premixing with the primary air jet delivered by the air distribution chamber, the gas jet is ejected from the primary premixed gas annular nozzle to form a conical film-shaped primary premixed jet for combustion. This jet then intersects with the secondary air jet generated by the secondary air nozzle on the air delivery fan at a certain angle to form a multi-stage flame-stabilizing vortex. The secondary air jet generated by the secondary air nozzle is also used to extend the mixing path between the primary premixed jet and the secondary air jet during combustion.

[0010] Compared with the prior art, the low air-fuel ratio roller kiln burner of the present invention premixes the gas jet delivered by the gas delivery orifice in the premixed gas delivery section with the primary air delivered by the air distribution chamber to form a uniform premixed gas. A conical thin-film primary premixed jet is formed in cooperation with the conical guide diffuser and the annular nozzle of the primary premixed gas, improving flame rigidity and combustion stability. Simultaneously, the secondary air nozzle, arranged at an angle by the inclined air delivery fan, ejects a secondary air jet at a specific angle, intersecting with the primary premixed jet to form a multi-stage flame-stabilizing vortex, prolonging the mixing process. The combined path ensures complete combustion at low air-fuel ratios, reducing flue gas heat loss and improving energy efficiency; the multi-stage vortex enhances anti-coking performance, reducing carbon buildup and kiln shutdown cleaning frequency, ensuring production continuity; in addition, the primary premixed jet and secondary air staged supply structure enhance adaptability to combustion air pressure fluctuations, enabling the burner to maintain flame stability even at ultra-low pressures. It comprehensively solves the problems of high flue gas heat loss, easy coking shutdown, and poor pressure adaptability of traditional burners, reducing fuel consumption by more than 15% compared to traditional burners and significantly reducing the frequency of coking cleaning.

[0011] Furthermore, the outer end of the gas annular mixing chamber is provided with a gas annular spray slit, the annular width of which is smaller than the annular width of the gas annular mixing chamber. By setting the annular width of the gas annular spray slit to be smaller than that of the gas annular mixing chamber, the flow rate and injection kinetic energy of the gas jet are effectively improved, the premixing effect with primary air is enhanced, the uniformity and combustion stability of the premixed gas are further optimized, and the air-fuel ratio is reduced and carbon deposit formation is reduced.

[0012] Furthermore, the conical flow guide diffuser is connected to the inner end of the air distribution chamber via a connecting column. The connecting column is cylindrical and its outer diameter is smaller than that of the conical flow guide diffuser. By using a cylindrical connecting column with an outer diameter smaller than that of the conical flow guide diffuser for connection, the obstruction and interference of the connection structure on the primary air and premixed airflow are minimized, ensuring smooth flow and uniform mixing of the airflow in the premixing chamber. This helps to form a more stable conical thin film premixed jet, improving flame quality and combustion efficiency.

[0013] Furthermore, the outer diameter of the outer end of the conical guide diffuser is greater than or equal to the inner diameter of the air distribution chamber and less than the inner diameter of the premixing chamber. By setting the outer diameter of the outer end of the conical guide diffuser to be greater than or equal to the inner diameter of the air distribution chamber and less than the inner diameter of the premixing chamber, the size of the annular nozzle of the primary premixed gas between the conical guide diffuser and the wall of the premixing chamber is precisely defined, ensuring that the premixed gas can be ejected at high speed in a uniform conical film shape, effectively improving the rigidity and stability of the flame, while optimizing the mixing efficiency with secondary air, making combustion more complete.

[0014] Furthermore, the bottom of the conical guide diffuser extends beyond the outside of the premixing chamber opening, and the outer end of the conical guide diffuser does not extend beyond the outer end of the air delivery fan or air delivery pipe. By extending the bottom of the conical guide diffuser to the outside of the premixing chamber opening but not beyond the outer end of the burner, the shape of the conical film-shaped premixed jet is effectively guided and protected, preventing it from diffusing prematurely or being disturbed. At the same time, it ensures that the premixed jet can mix with the secondary air jet at the burner outlet at the optimal position and angle, thereby enhancing the formation of the multi-stage flame stabilization vortex and further improving combustion stability and efficiency.

[0015] Furthermore, multiple secondary air nozzles are provided along the radial direction of the air delivery fan; by providing multiple secondary air nozzles in the radial direction of the air delivery fan, the coverage range of the secondary air jet and the intersection point with the primary premixed jet are significantly increased, thereby forming more layered and more uniformly distributed stable flame vortexes, greatly extending the mixing path and enhancing the turbulent mixing effect, ensuring the complete combustion of fuel under low air-fuel ratio conditions, and effectively improving the stability of the flame and the adaptability of the burner to load changes.

[0016] Furthermore, the air delivery holes are arranged radially and staggered relative to the gas delivery holes. By setting the air delivery holes and gas delivery holes to be staggered relative to each other, the two types of holes are structurally prevented from crossing within the premixed gas delivery section, simplifying the processing technology and enhancing the structural strength. At the same time, this layout ensures that the primary air and gas jets can maintain their independent flow paths when entering the premixing chamber until the premixing stage, thereby achieving more thorough and controllable mixing within the premixing chamber, which is beneficial for forming a uniform and stable premixed gas and improving combustion efficiency.

[0017] Furthermore, the air delivery pipe is equipped with an air intake regulating valve; by setting the air intake regulating valve, the air intake volume can be adjusted according to process requirements.

[0018] Furthermore, the intake regulating valve includes a valve body, a rotary valve core, and an adjusting handle. The valve body has an inner valve body cavity and an air inlet and an air outlet communicating with both ends of the valve body cavity. A rotating mounting seat is provided inside the valve body cavity, and the rotating mounting seat has a rotating movable cavity arranged radially along the valve body cavity. Flow regulating holes communicating with the air inlet and air outlet are respectively provided at both ends of the rotating movable cavity. The rotary valve core is rotatably placed inside the rotating movable cavity, and the rotary valve core has a valve core cavity arranged radially. The adjusting handle is located outside the valve body and is drivenly connected to the rotary valve core. By controlling the relative rotation of the rotary valve core, the airflow between the valve core cavity and the valve body cavity is adjusted, thereby adjusting the air intake volume of the air delivery channel; precise control and rapid response of combustion air flow are achieved. The rotation of the rotary valve core in the rotating movable cavity can infinitely adjust the alignment area between the valve core cavity and the flow regulating hole, achieving high-precision control of air flow.

[0019] Furthermore, the intake regulating valve also includes a valve cover, which has a clearance opening corresponding to the regulating handle. The valve body has an assembly port that opens radially and communicates with the rotating movable cavity. The rotary valve core is assembled in the rotating movable cavity through the assembly port. The inner end of the rotary valve core is assembled in the rotating movable cavity through a corrugated spring. The valve cover is connected to the assembly port to fix the rotary valve core in the rotating movable cavity. The valve cover is sealed to the outer end of the rotary valve core through a sealing ring. By optimizing the sealing and assembly structure of the intake regulating valve, the reliability and maintenance convenience of the equipment are significantly improved. The fit design between the valve cover and the assembly port enables quick disassembly and assembly of the rotary valve core. The elastic support of the corrugated spring ensures the flexibility of the valve core rotation and automatically compensates for wear gaps, so that the intake regulating valve maintains precise control performance after long-term use, resulting in good product reliability.

[0020] Furthermore, the adjustment handle is equipped with a valve position pointer; the valve position pointer allows the operator to intuitively and accurately read the current opening position of the intake regulating valve, which not only realizes visual adjustment of the air-fuel ratio, but also ensures the consistency of repeated adjustments through scale markings; this design, through the linkage between the mechanical indicator and the adjustment handle, makes it easy for the operator to quickly adjust the intake regulating valve to the preset optimal operating point, significantly improving the adjustment accuracy and operational reliability of the combustion system under low air-fuel ratio conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the burner of a low air-fuel ratio roller kiln located at the top of the air delivery pipe and premixed gas delivery section.

[0022] Figure 2 for Figure 1 A sectional view of DD.

[0023] Figure 3This is a cross-sectional view of the burner of a low air-fuel ratio roller kiln located at the inlet regulating valve.

[0024] Figure 4 for Figure 2 A cross-sectional view of the intake regulating valve is added under sectional view.

[0025] Figure 5 for Figure 2 Sectional view of AA.

[0026] Figure 6 for Figure 2 A cross-sectional view of BB.

[0027] Figure 7 for Figure 2 A sectional view of CC.

[0028] Figure 8 Cross-section of the intake regulating valve Figure 1 .

[0029] Figure 9 Cross-section of the intake regulating valve Figure 2 .

[0030] Labeling Explanation: Igniter 5, Air Delivery Pipe 2, Premixed Gas Delivery Section 1, Air Delivery Fan Coil 3, Air Delivery Channel 21, Flame Nozzle 22, Gas Delivery Pipe 4, Gas Delivery Channel 41, Conical Guide Diffuser 12, Air Distribution Chamber 11, Premixing Chamber 13, Air Delivery Hole 111, Gas Delivery Hole 141, Gas Annular Mixing Chamber 15, Primary Premixed Gas Annular Nozzle 16, Gas Distribution Chamber 14, Secondary Air Nozzle 31, Gas Annular Nozzle 151. Seam 151, connecting column 121, gas conveying body 140, air conveying body 110, guide slope 152, air intake regulating valve 6, valve body 61, rotary valve core 62, regulating handle 63, air inlet 64, air outlet 65, rotary mounting base 66, rotary movable cavity 661, flow regulating hole 67, valve core cavity 621, valve cover 68, clearance port 69, assembly port 611, corrugated spring 613, sealing ring 614, valve position pointer 615. Detailed Implementation

[0031] The specific embodiments of the present invention are described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the present invention.

[0032] See Figures 1 to 9The low air-fuel ratio roller kiln burner of the present invention includes an igniter 5, an air delivery pipe 2, a gas delivery pipe 4, a premixed gas delivery section 1, and an air delivery fan 3.

[0033] The air delivery pipe 2 has an air delivery channel 21 located on the inner side, and the outer end of the air delivery channel 21 opens to form a flame nozzle 22.

[0034] The gas delivery pipe 4 is located inside the air delivery channel 21 and has a gas delivery channel 41 located on the inner side. The gas delivery channel 41 is used to provide and deliver gas jets.

[0035] The premixed gas delivery unit 1 is located within the air delivery channel 21. It includes an air distribution chamber 11 at its inner end, a premixing chamber 13 located outside the air distribution chamber 11 with an open outer end, and a conical guide diffuser 12. The air distribution chamber 11 has an air delivery hole 111 communicating with the air delivery channel 21 on its inner side. The premixed gas delivery unit 1 has several axially arranged gas delivery holes 141 and a gas annular mixing chamber 15 surrounding the outer side of the air distribution chamber 11. The inner ends of the gas delivery holes 141 communicate with the gas delivery channel 41. Each gas delivery hole 141... The gas annular mixing chamber 15 is connected to the premixing chamber 13. The outer ends of each gas delivery hole 141 are connected to each other through the gas annular mixing chamber 15. The conical guide diffuser 12 is arranged in the premixing chamber 13 and is concentric with the air distribution chamber 11. Specifically, the centers of the two are aligned or the center lines of the two are aligned. The premixing chamber 13 and the air distribution chamber 11 are preferably circular. The outer diameter of the conical guide diffuser 12 gradually increases along the outer direction. A primary premixed gas annular nozzle 16 is formed between the inner circumference of the opening of the premixing chamber 13 and the outer circumference of the bottom of the conical guide diffuser 12.

[0036] An air conveying fan 3 is connected to the outer periphery of the outer end of the premixed gas conveying section 1, and is provided with a plurality of secondary air nozzles 31 arranged obliquely along the center line of the premixed gas conveying section 1. The premixed gas conveying section 1 and the air conveying fan 3 are preferably an integral structure.

[0037] The gas delivery hole 141 is used to transport the gas jet circumferentially through the gas annular mixing chamber 15 and then axially to the premixing chamber 13. After premixing with the primary air jet delivered by the air distribution chamber 11, the gas jet is ejected from the primary premixed gas annular nozzle 16 to form a conical film-shaped primary premixed jet and is combusted. Then, it intersects with the secondary air jet generated by the secondary air nozzle 31 on the air delivery fan 3 at a certain angle to form a multi-stage flame stabilizing vortex. The secondary air jet generated by the secondary air nozzle 31 is also used to extend the mixing path between the primary premixed jet and the secondary air jet during combustion.

[0038] Multiple gas delivery holes 141 are provided, with three gas delivery holes 141 located around the premixed gas delivery section 1 in each of the four directions, forming a group of three gas delivery holes 141. Radially arranged air delivery holes 111 are provided between adjacent groups of gas delivery holes 141.

[0039] Compared with the prior art, the low air-fuel ratio roller kiln burner of the present invention premixes the gas jet delivered by the gas delivery hole 141 in the premixed gas delivery section 1 with the primary air delivered by the air distribution chamber 11 in the premixing chamber 13 to form a uniform premixed gas. Under the cooperation of the conical guide diffuser 12 and the annular nozzle 16 of the primary premixed gas, a conical film-shaped primary premixed jet is formed, which improves the flame rigidity and combustion stability. At the same time, the secondary air nozzle 31 of the air delivery fan 3, which is inclined, ejects a secondary air jet at a specific angle, which intersects with the primary premixed jet to form a multi-stage... The stabilized flame vortex extends the mixing path, ensuring complete combustion at low air-fuel ratios, reducing flue gas heat loss, and improving energy efficiency. The multi-stage vortex enhances anti-coking performance, reducing carbon buildup and kiln shutdown cleaning frequency, ensuring continuous production. In addition, the primary premixed jet and secondary air staged supply structure enhance adaptability to combustion air pressure fluctuations, enabling the burner to maintain flame stability even at ultra-low pressures. This comprehensively solves the problems of high flue gas heat loss, easy coking shutdowns, and poor pressure adaptability of traditional burners, reducing fuel consumption by more than 15% compared to traditional burners and significantly reducing the frequency of coking cleaning.

[0040] See Figures 1 to 7 In one embodiment, the outer end of the gas annular mixing chamber 15 is provided with a gas annular spray slit 151. The annular width of the gas annular spray slit 151 is smaller than the annular width of the gas annular mixing chamber 15. The inner side of the gas annular mixing chamber 15 is transitionally connected to the gas annular spray slit 151 through a guide slope 152. By setting the annular width of the gas annular spray slit 151 to be smaller than the annular width of the gas annular mixing chamber 15, the flow rate and injection kinetic energy of the gas jet are effectively improved, the premixing effect with primary air is enhanced, the uniformity and combustion stability of the premixed gas are further optimized, and the air-fuel ratio is reduced and carbon deposit formation is reduced.

[0041] See Figures 1 to 7 In one embodiment, the conical diffuser 12 is connected to the inner end of the air distribution chamber 11 via a connecting post 121. The connecting post 121 is cylindrical and has an outer diameter smaller than that of the conical diffuser 12. By using a cylindrical connecting post 121 with an outer diameter smaller than that of the conical diffuser 12 for connection, the obstruction and interference of the connection structure on the primary air and premixed airflow are minimized, ensuring smooth flow and uniform mixing of the airflow in the premixing chamber 13. This helps to form a more stable conical thin-film premixed jet, improving flame quality and combustion efficiency.

[0042] See Figures 1 to 7In one embodiment, the premixed gas delivery unit 1 includes a gas delivery body 140 and an air delivery body 110 disposed within the gas delivery body 140. The gas delivery hole 141 is disposed within the gas delivery body 140, and the air distribution chamber 11 is disposed within the air delivery body 110. The gas delivery body 140, the air delivery body 110, and the conical guide diffuser 12 are integrated into a single structure. By integrating the gas delivery body 140, the air delivery body 110, and the conical guide diffuser 12 into a single structure, the overall structural strength and sealing of the premixed gas delivery unit 1 are greatly enhanced, effectively avoiding gas leakage and flow channel misalignment caused by component assembly errors or thermal deformation, and ensuring the stability and reliability of the gas-air premixing process. At the same time, the integrated structure reduces thermal stress concentration at high temperatures, improves the durability and service life of the burner, and simplifies the manufacturing and maintenance process.

[0043] See Figures 1 to 7 In one embodiment, the premixed gas conveying unit 1 is provided with a gas distribution chamber 14 that connects to the outer end of the gas conveying channel 41, and the inner end of each gas conveying hole 141 is connected to the gas distribution chamber 14. By setting the gas distribution chamber 14 and connecting it to the inner end of each gas conveying hole 141, it is ensured that the gas can be evenly distributed and conveyed to each gas conveying hole 141, thereby forming multiple gas jets with balanced flow and pressure in the gas annular mixing chamber 15, which significantly improves the uniformity of subsequent premixing with air, provides a reliable guarantee for forming a stable and consistent conical film-shaped premixed jet, and ultimately optimizes the completeness of combustion and the stability of the flame.

[0044] See Figures 1 to 7 In one embodiment, the outer diameter of the outer end of the conical diffuser 12 is greater than or equal to the inner diameter of the air distribution chamber 11 and less than the inner diameter of the premixing chamber 13. By setting the outer diameter of the outer end of the conical diffuser 12 to be greater than or equal to the inner diameter of the air distribution chamber 11 and less than the inner diameter of the premixing chamber 13, the size of the annular nozzle 16 for the primary premixed gas between the conical diffuser 12 and the wall of the premixing chamber 13 is precisely defined, ensuring that the premixed gas can be ejected at high speed in a uniform conical film shape, effectively improving the rigidity and stability of the flame, while optimizing the mixing efficiency with secondary air, making combustion more complete.

[0045] See Figures 1 to 7In one embodiment, the bottom of the conical guide diffuser 12 extends beyond the opening of the premixing chamber 13, and the outer end of the conical guide diffuser 12 does not extend beyond the outer end of the air delivery fan 3 or the air delivery pipe 2. By extending the bottom of the conical guide diffuser 12 to the outside of the opening of the premixing chamber 13 but not beyond the outer end of the burner, the shape of the conical film-shaped premixed jet is effectively guided and protected, preventing it from diffusing prematurely or being disturbed. At the same time, it ensures that the premixed jet can mix with the secondary air jet at the burner outlet at the optimal position and angle, thereby strengthening the formation of the multi-stage flame stabilization vortex and further improving combustion stability and efficiency.

[0046] See Figures 1 to 7 In one embodiment, multiple secondary air nozzles 31 are provided along the radial direction of the air delivery fan 3. By providing multiple secondary air nozzles 31 in the radial direction of the air delivery fan 3, the coverage range of the secondary air jet and the intersection point with the primary premixed jet are significantly increased, thereby forming more layers and more uniformly distributed stable flame vortexes, greatly extending the mixing path and enhancing the turbulent mixing effect, ensuring the complete combustion of fuel under low air-fuel ratio conditions, and effectively improving the stability of the flame and the adaptability of the burner to load changes.

[0047] See Figures 1 to 7 In one embodiment, the air delivery hole 111 is arranged radially and staggered relative to the gas delivery hole 141. By staggering the air delivery hole 111 and the gas delivery hole 141 radially, the primary air jet and the gas jet can collide and intertwine at the optimal angle and position in the premixing chamber 13, which greatly enhances the turbulent shearing and mixing effect, thereby significantly improving the uniformity and mixing efficiency of the premixed gas. This lays a solid foundation for forming a stable and uniform conical film-shaped premixed jet, and ultimately ensures the sufficiency and stability of combustion under low air-fuel ratio conditions.

[0048] See Figure 2 , Figure 3 , Figure 8 and Figure 9 In one embodiment, the air delivery pipe 2 is equipped with an air intake regulating valve 6; by setting the air intake regulating valve 6, the air intake volume can be adjusted according to process requirements.

[0049] See Figure 2 , Figure 3 , Figure 8 and Figure 9In one embodiment, the intake regulating valve 6 includes a valve housing 61, a rotary valve core 62, and an adjusting handle 63. The valve housing 61 has an inner valve housing cavity and an air inlet 64 and an air outlet 65 communicating with both ends of the valve housing cavity. A rotating mounting seat 66 is provided inside the valve housing cavity. The rotating mounting seat 66 has a rotating movable cavity 661 arranged radially along the valve housing cavity. Flow regulating holes 67 communicating with the air inlet 64 and the air outlet 65 are respectively provided at both ends of the rotating movable cavity 661. The rotary valve core 62 is rotatably placed in the rotating movable cavity 661. Inside, the rotary valve core 62 has a radially arranged valve core cavity 621. The adjusting handle 63 is located outside the valve housing 61 and is connected to the rotary valve core 62 in a transmission manner. By controlling the relative rotation of the rotary valve core 62, the air flow between the valve core cavity 621 and the valve housing cavity is adjusted, thereby adjusting the air intake of the air delivery channel 21. This achieves precise control and rapid response of the combustion air flow. The rotation of the rotary valve core 62 in the rotating movable cavity 661 can infinitely adjust the alignment area between the valve core cavity 621 and the flow adjustment hole 67, thereby achieving high-precision control of the air flow.

[0050] See Figure 2 , Figure 3 , Figure 8 and Figure 9 In one embodiment, the intake regulating valve 6 further includes a valve cover 68, which has a clearance opening 69 corresponding to the regulating handle 63. The valve housing 61 has a mounting port 611 that is radially open and communicates with the rotating movable cavity 661. The rotary valve core 62 is mounted in the rotating movable cavity 661 through the mounting port 611. The inner end of the rotary valve core 62 is mounted in the rotating movable cavity 661 through a bellows spring 613. The valve cover 68 is connected to the mounting port 611 to fix the rotary valve core 62 in the rotating movable cavity 661. Inside the movable cavity 661, the valve cover 68 is sealed to the outer end of the rotary valve core 62 via a sealing ring 614. By optimizing the sealing and assembly structure of the intake regulating valve 6, the reliability and ease of maintenance of the equipment are significantly improved: the fit design between the valve cover 68 and the assembly port 611 enables quick disassembly and assembly of the rotary valve core 62, and the elastic support of the bellows spring 613 ensures the flexibility of the valve core rotation and automatically compensates for wear gaps, so that the intake regulating valve 6 maintains precise control performance after long-term use, and the product has good reliability.

[0051] See Figure 2 , Figure 3 , Figure 8 and Figure 9In one embodiment, the adjusting handle 63 is equipped with a valve position pointer 615. The valve position pointer 615 allows the operator to intuitively and accurately read the current opening position of the intake regulating valve 6, which not only realizes the visual adjustment of the air-fuel ratio, but also ensures the consistency of repeated adjustments through scale markings. This design, through the linkage between the mechanical indicator and the adjusting handle 63, makes it easy for the operator to quickly adjust the intake regulating valve 6 to the preset optimal operating point, significantly improving the adjustment accuracy and operational reliability of the combustion system under low air-fuel ratio conditions.

[0052] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A low excess air roller kiln burner characterized by, The application relates to a gas stove, which comprises the following components: a gas igniter; an air delivery pipe, which is provided with an air delivery channel located on the inner side, and the outer end of the air delivery channel is open to form a flame spout; a premixed gas delivery part, which is arranged in the air delivery channel and is provided with an air distribution chamber located on the inner end, a premixing chamber located on the outer side of the air distribution chamber and open at the outer end, and a conical flow guide diffuser, the inner side of the air distribution chamber is provided with an air delivery hole communicated with the air delivery channel, the premixed gas delivery part is provided with a plurality of gas delivery holes and gas annular mixing chambers arranged along the axial direction around the outer side of the air distribution chamber, each gas delivery hole is communicated with the premixing chamber through the gas annular mixing chamber, the outer ends of the gas delivery holes are communicated with each other through the gas annular mixing chamber, the conical flow guide diffuser is arranged in the premixing chamber and is concentric with the air distribution chamber, the outer diameter of the conical flow guide diffuser gradually increases along the outer side direction, and the open inner periphery of the premixing chamber and the outer periphery of the bottom of the conical flow guide diffuser form a primary premixed gas annular spout; an air delivery fan disc, which is connected around the outer periphery of the outer end of the premixed gas delivery part and is provided with a plurality of secondary air spouts arranged along the center line direction of the premixed gas delivery part; the gas delivery holes are used for premixing the gas jet flow along the circumferential direction through the gas annular mixing chamber and the primary air jet flow delivered to the premixing chamber and the air distribution chamber, and then the premixed gas is jetted out from the primary premixed gas annular spout to form a conical thin film primary premixed jet flow and is combusted, and then the secondary air jet flow generated by the secondary air spouts on the air delivery fan disc intersects with the primary premixed jet flow at a certain angle to form a multi-stage stable flame vortex, and the secondary air jet flow generated by the secondary air spouts is also used for prolonging the mixing path of the primary premixed jet flow and the secondary air jet flow during combustion.

2. The low air-fuel ratio roller kiln burner of claim 1, wherein, the outer end of the gas annular mixing chamber is provided with a gas annular spout, and the ring width of the gas annular spout is smaller than that of the gas annular mixing chamber.

3. The low air-fuel ratio roller kiln burner of claim 1, wherein, the conical flow guide diffuser is connected with the inner end of the air distribution chamber through a connecting column, the connecting column is in a cylindrical shape and has an outer diameter smaller than that of the conical flow guide diffuser.

4. The low air-fuel ratio roller kiln burner of claim 1, wherein, the outer end part of the conical flow guide diffuser has an outer diameter greater than or equal to the inner diameter of the air distribution chamber and smaller than the inner diameter of the premixing chamber; the bottom of the conical flow guide diffuser extends out of the outer side of the opening of the premixing chamber, and the outer end part of the conical flow guide diffuser does not extend out of the outer end of the air delivery fan disc or the air delivery pipe.

5. The low air-fuel ratio roller kiln burner of claim 1, wherein, the secondary air spouts are arranged in the radial direction of the air delivery fan disc.

6. The low air-fuel ratio roller kiln burner of claim 1, wherein, the air delivery holes are arranged in the radial direction and are oppositely staggered with the gas delivery holes.

7. A low air-fuel ratio roller kiln burner according to any one of claims 1 to 6, characterised in that, the air delivery pipe is provided with an air inlet adjusting valve; the air inlet adjusting valve comprises a valve shell, a rotary valve core and an adjusting handle, the valve shell is provided with a valve shell cavity located on the inner side, an air inlet and an air outlet communicated with both ends of the valve shell cavity, a rotary mounting seat is arranged in the valve shell cavity, the rotary mounting seat is provided with a rotary movable cavity arranged in the radial direction of the valve shell cavity, flow adjusting holes communicated with the air inlet and the air outlet are arranged at both ends of the rotary movable cavity respectively, the rotary valve core is rotatably arranged in the rotary movable cavity, a valve core cavity is arranged in the radial direction of the rotary valve core, the adjusting handle is located on the outer side of the valve shell and is in transmission connection with the rotary valve core, the air flow capacity of the valve core cavity and the valve shell cavity is adjusted by controlling the relative rotation of the rotary valve core, so that the air inlet amount of the air delivery channel is adjusted.

8. The low air-fuel ratio roller kiln burner of claim 7, wherein, The air intake regulating valve further comprises a valve cover, the valve cover is provided with a avoiding opening corresponding to the regulating handle, the valve shell is provided with an assembly opening opening in the radial direction and communicating with a rotary cavity, the rotary valve core is assembled in the rotary cavity through the assembly opening, the inner end of the rotary valve core is assembled in the rotary cavity through a corrugated spring, the valve cover is connected with the assembly opening to fix the rotary valve core in the rotary cavity, and the valve cover is sealed with the outer end of the rotary valve core through a sealing ring.

9. The low air-fuel ratio roller kiln burner of claim 7, wherein, The regulating handle is provided with a valve position pointer.

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