Roller kiln burner with low air pressure and low air fuel ratio

Abstract

The invention belongs to the technical field of combustors, and particularly relates to a roller kiln combustor with low air pressure and low air fuel ratio. According to the low-air-pressure and low-air-fuel-ratio roller kiln burner, through the collaborative design of the premixed gas conveying part and the combustion-supporting gas conveying air disc, the low-air-pressure and low-air-fuel-ratio (alphalt; according to the efficient and stable combustion under the condition, fuel gas jet flow conveyed by a fuel gas conveying hole and primary air jet flow input by a primary air nozzle are matched with a conical flow guide diffuser and a primary premixed gas annular nozzle to form conical film-shaped primary premixed jet flow, and the conical film-shaped primary premixed jet flow is combined with inclined secondary air jet flow generated by a secondary air nozzle to form multi-stage flame stabilizing vortexes; the flame rigidity and the combustion sufficiency are obviously improved; the design of the gas distribution chamber and the radial primary air nozzle enhances the premixing effect of gas and air, and reduces the risk of carbon deposition.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of burners, and particularly relates to a low-air-pressure low-air-fuel-ratio roller kiln burner. BACKGROUND

[0002] The fuel cost of a ceramic industrial roller kiln accounts for 60%-80% of the total production cost, and the fluctuation of fuel prices has a significant impact on enterprise profits. The traditional burner has problems such as insufficient combustion, poor flame rigidity, and easy carbon deposition under the condition of low air excess factor (α<1), and specifically shows insufficient flame stability, high flue gas heat loss, insufficient anti-coking ability, leading to easy carbon deposition of the fire tube, frequent shutdown for cleaning, affecting production continuity, and poor air pressure adaptability, specifically sensitive to pressure fluctuations, unable to work stably under ultra-low pressure (such as below 500 Pa), limiting energy-saving potential. SUMMARY

[0003] The present application aims to overcome the problems of insufficient combustion of the existing roller kiln burner under the condition of low air excess factor, leading to poor flame rigidity and easy carbon deposition, and to provide a low-air-pressure low-air-fuel-ratio roller kiln burner that can burn fully under the condition of low air excess factor.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: The low-air-pressure low-air-fuel ratio roller kiln burner comprises an igniter, a combustion-supporting gas conveying part, a premixed gas conveying part and a combustion-supporting gas conveying air disc; the combustion-supporting gas conveying part is provided with a combustion-supporting gas conveying channel located at the inner side, and the outer end opening of the combustion-supporting gas conveying channel forms a flame jet; the premixed gas conveying part is arranged in the combustion-supporting gas conveying channel and comprises a premixed gas conveying body and a conical flow-guiding diffuser body, the premixed gas conveying body comprises a gas distribution chamber located at the inner end and a premixed chamber with an outer end opening, the gas distribution chamber is provided with a gas conveying hole communicating with the premixed chamber, the outer periphery of the premixed gas conveying body is provided with a plurality of primary air jet openings communicating with the combustion-supporting gas conveying channel and the premixed chamber, the conical flow-guiding diffuser body is arranged in the premixed chamber, the outer diameter of the conical flow-guiding diffuser body gradually increases along the outer side direction, and the inner periphery of the opening of the premixed chamber and the outer periphery of the bottom of the conical flow-guiding diffuser body form a primary premixed gas annular jet; the combustion-supporting gas conveying air disc is connected around the outer periphery of the outer end of the premixed gas conveying body and is provided with a plurality of secondary air jet openings arranged obliquely along the center line direction of the premixed gas conveying part, and the combustion-supporting gas conveying air disc and the inner peripheral wall of the combustion-supporting gas conveying part form a secondary premixed gas annular jet arranged obliquely along the center line direction of the premixed gas conveying part; the gas conveying hole is used for conveying a gas jet along the axial direction to the premixed chamber, premixing with the primary air jet radially input from the primary air jet opening, and then jetting out from the primary premixed gas annular jet to form a conical thin film primary premixed jet and burn, and then the primary premixed jet is intersected at a certain angle with the secondary air jet generated by the secondary air jet opening of the combustion-supporting gas conveying air disc to form a multi-stage stable flame vortex, and the tertiary air jet generated by the secondary premixed gas annular jet is used for prolonging the mixing path of the primary premixed jet and the secondary air jet during combustion.

[0005] Compared with the prior art, the low-air-pressure low-air-fuel ratio roller kiln burner of the present application realizes high-efficiency stable combustion under the conditions of low air pressure and low air-fuel ratio (α<1) through the cooperative design of the premixed gas conveying part and the combustion-supporting gas conveying air disc: the gas jet conveyed by the gas conveying hole and the primary air jet input from the primary air jet opening form a conical thin film primary premixed jet under the cooperation of the conical flow-guiding diffuser body and the primary premixed gas annular jet, and a multi-stage stable flame vortex is formed in combination with the oblique secondary air jet generated by the secondary air jet opening, thereby significantly improving the flame rigidity and combustion completeness; the design of the gas distribution chamber and the radial primary air jet opening enhances the premixing effect of the gas and the air and reduces the risk of carbon deposition; the tertiary air jet generated by the secondary premixed gas annular jet is used for prolonging the mixing path of the primary premixed jet and the secondary air jet during combustion, and the pressure self-adaptive structure is formed in cooperation with the obliquely arranged secondary air jet opening, so that the burner can still maintain flame stability under ultra-low pressure, thereby comprehensively solving the problems of high flue gas heat loss, easy coking and shutdown and poor pressure adaptability of the traditional burner, reducing fuel consumption by more than 15% compared with the traditional burner, and greatly reducing the frequency of coke removal.

[0006] Further, the combustion-supporting gas delivery air guide is a conical disc structure, and the secondary air nozzles are arranged in a ring on the combustion-supporting gas delivery air guide; in this way, the conical disc structure of the combustion-supporting gas delivery air guide and the ring-arranged secondary air nozzles form uniformly distributed inclined secondary air jets, which not only enhance the radial mixing effect of the primary premixed jet and the secondary air jet, form a stable high-temperature vortex area in the combustion area, strengthen the flame rigidity and prolong the gas residence time, but also enable sufficient combustion under ultra-low air pressure conditions, and the centrifugal effect of the conical disc structure can effectively prevent carbon deposition at the nozzle, and improve the anti-carbon deposition capacity and low-pressure working condition adaptability of the burner.

[0007] In addition, further, the secondary air nozzles are arranged in a relative radial direction; in this way, the centrifugal effect of the generated premixed gas flow can effectively prevent carbon deposition at the nozzle, and further improve the anti-carbon deposition capacity and low-pressure working condition adaptability of the burner.

[0008] Further, the direction of the secondary air nozzles is perpendicular to the inner cone surface of the combustion-supporting gas delivery air guide; in this way, the perpendicular arrangement of the secondary air nozzles and the inner cone surface of the combustion-supporting gas delivery air guide enables the secondary air jet to cut into the primary premixed jet at an optimal angle, form axial and radial double vortexes while ensuring sufficient shearing mixing of the primary premixed jet and the secondary air jet, enhance the high-temperature flue gas backflow effect to stabilize the flame root, and prolong the mixing path of the secondary air jet and the primary premixed jet through the reflection of the cone surface of the conical disc structure, so as to achieve complete combustion under a lower air-fuel ratio; this perpendicular injection mode also enables the secondary air jet to uniformly diffuse along the cone surface, effectively eliminate local oxygen-rich or oxygen-deficient areas, avoid local high-temperature coking or insufficient combustion caused by uneven mixing, and further improve the reliability and energy efficiency of the burner under extreme working conditions.

[0009] Further, the bottom surface of the conical flow guide diffuser extends out of or is located at the premixing chamber opening, and a first flow guide inclined surface is arranged on the inner periphery of the premixing chamber opening and inclined outward; in this way, the bottom surface of the conical flow guide diffuser extends out of or is located at the premixing chamber opening, and cooperates with the outwardly inclined first flow guide inclined surface structure to form a conical thin layer jet flow with a controllable expansion angle when the primary premixing gas is sprayed, thereby ensuring sufficient premixing effect of the secondary air jet and the primary premixing jet, and precisely controlling the flame diffusion form through the flow guiding effect of the first flow guide inclined surface structure; this design optimizes the gas flow expansion angle, reduces the speed of the primary premixing jet flow while enhancing the radial coverage range, makes the flame form more stable and the heat distribution more uniform, effectively avoids the problems of flame flickering or local high temperature caused by excessive diffusion of gas flow, and the Venturi effect generated by the inclined first flow guide inclined surface structure can improve the gas entraining capacity under low pressure conditions, further enhancing the stability and combustion efficiency of the burner under ultra-low air pressure working conditions.

[0010] Further, a second flow guide inclined surface is arranged on the inner periphery of the outer side of the combustion-supporting gas delivery air disc; in this way, the second flow guide inclined surface forms a converging flow guide channel at the periphery of the flame through the inwardly inclined structure design, so that the secondary air and the combustion flue gas produce a centripetal convergence effect, which not only strengthens the internal circulation flame stabilization effect of the high-temperature flue gas, but also improves the flame core area temperature through gas flow compression.

[0011] Further, the primary air nozzle is arranged in multiple rows along the axial direction of the premixing chamber; in this way, the multiple rows of axially arranged primary air nozzles form a stepped air distribution structure, so that the combustion-supporting air is gradually mixed with the fuel gas in stages and in regions, which not only avoids the problem of local excessive cooling caused by single-point concentrated air distribution, but also prolongs the residence time of the fuel gas in the premixing chamber through the staged combustion method; this design establishes a basic combustion zone through the upstream nozzle and supplements the air for burning out through the downstream nozzle, thereby forming a laminar flow combustion environment with a controllable temperature gradient in the premixing chamber, ensuring that the optimal air-fuel ratio is maintained under low air pressure working conditions.

[0012] Further, the fuel gas distribution chamber is connected with a main fuel gas delivery part, and the combustion-supporting gas delivery part is provided with an air inlet adjusting valve; in this way, the air inlet adjusting valve can be used to adjust the air inlet amount according to process requirements.

[0013] Further, the air intake regulating valve comprises a valve housing, a rotary valve core and a regulating handle, the valve housing is provided with a valve housing cavity on the inner side and an air inlet and an air outlet communicated with both ends of the valve housing cavity, a rotary mounting seat is arranged in the valve housing cavity, the rotary mounting seat is provided with a rotary movable cavity arranged along the radial direction of the valve housing cavity, flow regulating 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 rotary valve core along the radial direction, the regulating handle is arranged outside the valve housing and is in transmission connection with the rotary valve core, the air flow through the valve core cavity and the valve housing cavity is regulated by controlling the relative rotation of the rotary valve core, so that the air intake of the combustion-supporting gas delivery channel is regulated; by such arrangement, the precise regulation and rapid response of the combustion-supporting air flow are realized: the rotation of the rotary valve core in the rotary movable cavity can infinitely adjust the alignment area of the valve core cavity and the flow regulating hole, so that the air flow is controlled with high precision.

[0014] Further, the air intake regulating valve further comprises a valve cover, the valve cover is provided with a avoiding port corresponding to the regulating handle, the valve housing is provided with a assembly port opened along the radial direction and communicated with the rotary movable cavity, the rotary valve core is assembled in the rotary movable cavity through the assembly port, the inner end of the rotary valve core is assembled in the rotary movable cavity through the corrugated spring, the valve cover is connected with the assembly port to fix the rotary valve core in the rotary movable cavity, and the valve cover is in sealing cooperation with the outer end of the rotary valve core through a sealing ring; by such arrangement, the sealing and assembly structure of the air intake regulating valve is optimized, and the reliability and maintenance convenience of the equipment are significantly improved: the cooperation design of the valve cover and the assembly port realizes the quick disassembly and assembly of the rotary valve core, the elastic support of the corrugated spring not only ensures the flexibility of the valve core rotation but also automatically compensates the wear gap, so that the valve still maintains the precise regulation performance after long-term use, and the product has good use reliability.

[0015] Further, the regulating handle is provided with a valve position pointer; by such arrangement, the configuration of the valve position pointer enables the operator to intuitively and accurately read the opening position of the current air intake regulating valve, not only realizing the visual adjustment of the air-fuel ratio, but also ensuring the consistency of repeated adjustment through the scale mark; the design realizes the linkage of the mechanical indication and the regulating handle, so that the worker can quickly adjust the valve to the preset optimal working point, and the adjustment precision and operation reliability of the combustion system under the low air-fuel ratio working condition are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a sectional view of the combustion-supporting air flow regulating valve of the low air pressure and low air-fuel ratio roller kiln.

[0017] Figure 2 It is a sectional view of the combustion-supporting air flow regulating valve of the low air pressure and low air-fuel ratio roller kiln.

[0018] Figure 3The sectional view of the premix gas delivery part of the low air pressure low air-fuel ratio roller kiln burner.

[0019] Figure 4 The schematic view of the premix gas delivery part and the combustion gas delivery air disc.

[0020] Figure 5 The sectional view of the premix gas delivery part at the primary air injection port.

[0021] Figure 6 The sectional view of the air inlet regulating valve Figure 1 .

[0022] Figure 7 The sectional view of the air inlet regulating valve Figure 2 .

[0023] Label explanation: igniter 5, combustion gas delivery part 2, premix gas delivery part 1, combustion gas delivery air disc 3, combustion gas delivery channel 21, flame injection port 22, premix gas delivery body 11, conical flow guide diffuser 12, combustion gas distribution chamber 13, premix chamber 14, combustion gas delivery hole 141, primary air injection port 111, connecting column 121, primary premix gas annular injection port 15, main combustion gas delivery part 4, main combustion gas delivery channel 41, secondary air injection port 31, secondary premix gas annular injection port 32, first flow guide inclined surface 16, second flow guide inclined surface 23, air inlet regulating valve 6, valve housing 61, rotary valve core 62, regulating handle 63, air inlet 64, air outlet 65, rotary mounting seat 66, rotary movable cavity 661, flow regulating hole 67, valve core cavity 621, valve cover 68, avoiding port 69, assembly port 611, corrugated spring 613, sealing ring 614, valve position pointer 615. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application are described below with reference to the accompanying drawings. In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] Referring to Figures 1 to 7 , the low air pressure low air-fuel ratio roller kiln burner of the present application comprises an igniter 5, a combustion gas delivery part 2, a premix gas delivery part 1, and a combustion gas delivery air disc 3.

[0026] The combustion gas delivery part 2 is provided with a combustion gas delivery channel 21 located on the inner side, and the outer end of the combustion gas delivery channel 21 is opened to form a flame injection port 22.

[0027] The premix gas delivery part 1 is arranged in the combustion-supporting gas delivery channel and comprises a premix gas delivery body 11 and a conical flow guide diffuser 12. The premix gas delivery body 11 comprises a gas distribution chamber 13 at an inner end and a premix chamber 14 with an opening at an outer end, the gas distribution chamber 13 is provided with gas delivery holes 141 communicating with the premix chamber 14, and the outer periphery of the premix gas delivery body 11 is provided with a plurality of primary air injection ports 111 communicating between the combustion-supporting gas delivery channel 21 and the premix chamber 14, the conical flow guide diffuser 12 is arranged in the premix chamber 14 and connected to the inner end of the premix chamber 14 through a connecting column 121, the connecting column 121 is cylindrical and has an outer diameter smaller than that of the conical flow guide diffuser 12, the outer diameter of the conical flow guide diffuser 12 gradually increases in the outward direction, the gas delivery holes 141 are arranged around the connecting column 121, and the opening of the premix chamber 14 and the outer periphery of the bottom of the conical flow guide diffuser 12 form a primary premix gas annular injection port 15. The rear end of the gas distribution chamber 13 is provided with a main gas delivery part 4, the main gas delivery part 4 is provided with a main gas delivery channel 41 communicating with the gas distribution chamber 13, and the main gas delivery channel 41 is used to provide gas to the gas distribution chamber 13.

[0028] The combustion-supporting gas delivery air disc 3 is connected to the outer periphery of the outer end of the premix gas delivery body 11 and is provided with a plurality of secondary air injection ports 31 arranged obliquely along the center line direction of the premix gas delivery part 1, and the combustion-supporting gas delivery air disc 3 and the inner wall of the combustion-supporting gas delivery part 2 form a secondary premix gas annular injection port 32 arranged obliquely along the center line direction of the premix gas delivery part 1.

[0029] The gas delivery holes 141 are used to deliver gas jets in the axial direction to the primary air jets input radially from the primary air injection ports 111, and after premixing, the primary premix gas annular injection port 15 is used to spray a conical thin film primary premix jet and burn, and then the secondary air jets generated by the secondary air injection ports 31 on the combustion-supporting gas delivery air disc 3 intersect at a certain angle to form a multi-stage stable flame vortex, and the tertiary air jets generated by the secondary premix gas annular injection port 32 are used to prolong the mixing path of the primary premix jet and the secondary air jets during combustion.

[0030] Compared with the prior art, the low-air-pressure low-air-fuel ratio roller kiln burner of the application realizes high-efficiency stable combustion under the conditions of low air pressure and low air-fuel ratio (α<1) through the cooperative design of the premix gas delivery part 1 and the combustion-supporting gas delivery air disc 3: the fuel gas delivery hole 141 delivers a fuel gas jet, and the primary air jet input by the primary air nozzle 111 forms a conical thin film-shaped primary premix jet under the cooperation of the conical flow guide diffuser 12 and the primary premix annular nozzle 15, and the oblique secondary air jet generated by the secondary air nozzle 31 forms a multi-stage stable flame vortex, significantly improving the flame rigidity and combustion completeness; the fuel gas distribution chamber 13 and the radial primary air nozzle 111 are designed to enhance the premixing effect of fuel gas and air and reduce the risk of carbon deposition; the tertiary air jet generated by the secondary premix annular nozzle 32 is used to extend the mixing path of the primary premix jet and the secondary air jet during combustion, and cooperates with the obliquely arranged secondary air nozzle 31 to form a pressure self-adaptive structure, so that the burner can still maintain flame stability under ultra-low pressure, and comprehensively solves the problems of high flue gas heat loss, easy coking shutdown and poor pressure adaptability of traditional burners, and can reduce fuel consumption by more than 15% compared with traditional burners, greatly reducing the frequency of decoking.

[0031] Referring to Figures 1 to 5 In an embodiment, the combustion-supporting gas delivery air disc 3 is a conical disc structure, and a plurality of secondary air nozzles 31 are arranged circumferentially on the combustion-supporting gas delivery air disc 3; in this way, the combustion-supporting gas delivery air disc 3 in a conical disc structure forms uniformly distributed oblique secondary air jets through the circumferentially arranged secondary air nozzles 31, not only enhancing the radial mixing effect of the primary premix jet and the secondary air jet, but also forming a stable high-temperature vortex area in the combustion area, which not only strengthens the flame rigidity but also prolongs the gas residence time, so that sufficient combustion can still be maintained under ultra-low air pressure conditions, and the centrifugal effect generated by the conical disc structure can effectively prevent carbon soot from depositing at the nozzle, thereby improving the anti-carbon-deposition ability and low-pressure working condition adaptability of the burner.

[0032] In addition, in a further embodiment, a plurality of secondary air nozzles 31 are arranged obliquely along the circumferential direction along the relative radial direction, which better enables the centrifugal effect of the generated premix gas flow to effectively prevent carbon soot from depositing at the nozzle, thereby further improving the anti-carbon-deposition ability and low-pressure working condition adaptability of the burner.

[0033] In an embodiment, the secondary air nozzles 31 are arranged along the axial direction of the premix gas delivery part 1.

[0034] Referring to Figures 1 to 5In an embodiment, the orientation of the secondary air injection port 31 is perpendicular to the inner conical surface of the combustion-supporting gas delivery air disc 3. By arranging the secondary air injection port 31 perpendicular to the inner conical surface of the combustion-supporting gas delivery air disc 3, the secondary air jet is cut into the primary premixed jet at an optimal angle, which ensures sufficient shearing mixing of the primary premixed jet and the secondary air jet and forms axial and radial double vortexes, thereby enhancing the high-temperature flue gas backflow effect to stabilize the flame root and prolonging the mixing path of the secondary air jet and the primary premixed jet through the reflection of the conical surface of the combustion-supporting gas delivery air disc 3, so that complete combustion is achieved at a lower air-fuel ratio. The perpendicular injection mode also makes the secondary air jet uniformly diffuse along the conical surface, effectively eliminates local oxygen-rich or oxygen-deficient areas, avoids local high-temperature coking or incomplete combustion caused by uneven mixing, and further improves the reliability and energy efficiency of the burner under extreme working conditions.

[0035] Referring to Figures 1 to 5 In an embodiment, the bottom surface of the conical flow guide diffuser 12 extends out of or is located at the opening of the premixing chamber 14, and the inner periphery of the opening of the premixing chamber 14 is provided with a first flow guide inclined surface 16 arranged obliquely to the outside. By arranging the bottom surface of the conical flow guide diffuser 12 to extend out of or be located at the opening of the premixing chamber 14, and cooperating with the outwardly inclined first flow guide inclined surface 16, the primary premixed gas forms a conical thin-layer jet with a controllable expansion angle when injected, which not only ensures sufficient premixing effect of the secondary air jet and the primary premixed jet, but also precisely controls the flame diffusion form through the flow guiding effect of the first flow guide inclined surface 16. This design optimizes the gas flow expansion angle, reduces the speed of the primary premixed jet, and enhances the radial coverage range, making the flame form more stable and the heat distribution more uniform, effectively avoiding the problems of flame flickering or local high temperature caused by excessive gas flow diffusion. The Venturi effect generated by the inclined first flow guide inclined surface 16 can improve the gas entrainment capacity under low pressure, further enhancing the stability and combustion efficiency of the burner under ultra-low air pressure working conditions.

[0036] Referring to Figures 1 to 5 In an embodiment, the inner periphery of the opening of the combustion-supporting gas delivery part 2 is provided with a second flow guide inclined surface 23 arranged obliquely to the inside at the outside of the combustion-supporting gas delivery air disc 3. By arranging the second flow guide inclined surface 23 obliquely to the inside, a convergent flow guide channel is formed at the periphery of the flame, which produces a centripetal convergence effect of the secondary air and the combustion flue gas, thereby strengthening the internal circulation flame stabilization effect of the high-temperature flue gas and improving the flame core temperature through gas compression.

[0037] Referring to Figures 1 to 5In an embodiment, the primary air nozzles 111 are arranged in multiple rows in the axial direction of the premixing chamber 14; by such arrangement, the multiple rows of axially arranged primary air nozzles 111 form a stepped air distribution structure, so that the combustion-supporting air is mixed with the gas in stages and in regions, and the gas is gradually mixed in a progressive manner, avoiding the problem of local excessive cooling caused by single-point concentrated air distribution, and prolonging the residence time of the gas in the premixing chamber 14 by means of staged combustion; by means of the above-mentioned arrangement, a basic combustion zone is established by the upstream nozzles, and the downstream nozzles supplement the combustion-supporting air, so that a laminar flow combustion environment with controllable temperature gradient is formed in the premixing chamber 14, and the optimal air-fuel ratio is ensured even under low air pressure conditions.

[0038] Referring to Figure 6 and Figure 7 In an embodiment, the combustion-supporting gas delivery part 2 is provided with an air inlet adjusting valve 6 for adjusting the air inlet amount of the combustion-supporting gas delivery channel 21; by such arrangement, the air inlet amount can be adjusted according to process requirements by means of the air inlet adjusting valve 6.

[0039] Referring to Figure 6 and Figure 7 In an embodiment, the air inlet adjusting valve 6 comprises a valve housing 61, a rotary valve core 62, and an adjusting handle 63; the valve housing 61 is provided with a valve housing cavity on the inner side, and an air inlet 64 and an air outlet 65 which are in communication with both ends of the valve housing cavity; the air outlet 65 is in communication with the combustion-supporting gas delivery channel 21; the valve housing cavity is provided with a rotary mounting seat 66; the rotary mounting seat 66 is provided with a rotary movable cavity 661 arranged in the radial direction of the valve housing cavity; the rotary movable cavity 661 is provided with flow adjusting holes 67 which are in communication with the air inlet 64 and the air outlet 65 at both ends, respectively; the rotary valve core 62 is rotatably arranged in the rotary movable cavity 661; the rotary valve core 62 is provided with a valve core cavity 621 arranged in the radial direction; the adjusting handle 63 is arranged outside the valve housing 61 and is in transmission connection with the rotary valve core 62; 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, so as to adjust the air inlet amount of the combustion-supporting gas delivery channel 21; by such arrangement, precise control and rapid response of the combustion-supporting air flow are realized; the rotation of the rotary valve core 62 in the rotary movable cavity 661 can infinitely adjust the alignment area of the valve core cavity 621 and the flow adjusting holes 67, so as to realize high-precision control of the air flow.

[0040] Referring to Figure 6 and Figure 7In a further embodiment, the air intake regulating valve 6 further comprises a valve cover 68, which is provided with a clearance 69 corresponding to the regulating handle 63, and the valve housing 61 is provided with a mounting opening 611 opening in the radial direction and communicating with a rotary cavity 661, the rotary valve core 62 is mounted in the rotary cavity 661 through the mounting opening 611, the inner end of the rotary valve core 62 is mounted in the rotary cavity 661 through a corrugated spring 613, and the valve cover 68 is connected with the mounting opening 611 to fix the rotary valve core 62 in the rotary cavity 661, and the valve cover 68 is sealed with the outer end of the rotary valve core 62 through a sealing ring 614; by such a design, the sealing and mounting structure of the air intake regulating valve 6 is optimized, and the reliability and maintenance convenience of the equipment are significantly improved: the cooperation of the valve cover 68 and the mounting opening 611 realizes quick disassembly and assembly of the rotary valve core 62, and the elastic support of the corrugated spring 613 not only ensures the flexibility of the valve core rotation but also automatically compensates for the wear gap, so that the valve can maintain accurate control performance after long-term use, and the product has good reliability.

[0041] Referring to Figure 6 and Figure 7 In a further embodiment, the regulating handle 63 is provided with a valve position pointer 615; by such a design, the valve position pointer 615 enables the operator to intuitively and accurately read the opening position of the current air intake regulating valve 6, which not only realizes visual adjustment of the air-fuel ratio but also ensures consistency of repeated adjustment through the scale mark; the design realizes linkage of the mechanical indication and the regulating handle 63, so that the worker can quickly adjust the valve to the preset optimal working point, and the adjustment accuracy and operation reliability of the combustion system under low air-fuel ratio working conditions are significantly improved.

[0042] According to the disclosure and teaching of the above description, those skilled in the art of the present application can also make changes and modifications to the above embodiments. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present application should fall within the protection scope of the claims of the present application. In addition, although some specific terms are used in the present specification, these terms are only for convenience of description and do not constitute any limitation on the present application.

Claims

1. Low air pressure and low air-fuel ratio roller kiln burner, characterized by: include: Igniter; The combustion gas delivery portion is provided with a combustion gas delivery channel located on the inner side, and the outer end of the combustion gas delivery channel is opened to form a flame nozzle; The premixed gas delivery portion is arranged in the oxidizing gas delivery channel, and includes a premixed gas delivery body and a conical guide diffuser. The premixed gas delivery body includes a gas distribution chamber located at the inner end and a premixing chamber opened at the outer end. The gas distribution chamber is provided with a gas delivery hole connected to the premixing chamber. The periphery of the premixed gas delivery body is provided with a plurality of primary air nozzles connected to the oxidizing gas delivery channel and the premixing chamber. The conical guide diffuser is arranged in the premixing chamber. The outer diameter of the conical guide diffuser gradually increases along the outer direction. A primary premixed gas annular nozzle is formed between the inner periphery of the premixing chamber opening and the outer periphery of the bottom of the conical guide diffuser. The combustion-supporting gas delivery fan disk is connected to the outer periphery of the outer end of the premixed gas delivery portion and is provided with a plurality of secondary air nozzles arranged obliquely along the center line of the premixed gas delivery portion. A secondary premixed gas annular nozzle arranged obliquely along the center line of the premixed gas delivery portion is formed between the combustion-supporting gas delivery fan disk and the inner peripheral wall of the combustion-supporting gas delivery portion. The gas delivery hole is used to deliver the gas jet axially to the premixing chamber and premix it with the primary air jet radially input from the primary air nozzle, and then eject it from the primary premixed gas annular nozzle to form a conical film-shaped primary premixed jet and burn, and then intersect with the secondary air jet generated by the secondary air nozzle on the combustion-supporting gas delivery air disk at a certain angle to form a multi-stage flame-stabilizing vortex. The tertiary air jet generated by the secondary premixed gas annular nozzle is used to extend the mixing path of the primary premixed jet and the secondary air jet during combustion.

2. The low air pressure and low air-fuel ratio roller kiln burner according to claim 1, characterized in that: The oxidizing gas delivery air disk is a conical disk structure, and a plurality of the secondary air nozzles are circumferentially arranged on the oxidizing gas delivery air disk.

3. The low air pressure and low air-fuel ratio roller kiln burner according to claim 2, characterized in that: The secondary air nozzle is oriented perpendicular to the inner conical surface of the combustion-supporting gas delivery air disc.

4. The low air pressure and low air-fuel ratio roller kiln burner according to claim 1, characterized in that: The bottom surface of the conical flow-guiding diffuser extends out of the premixing chamber opening or is located at the premixing chamber opening. The inner periphery of the premixing chamber opening is provided with a first flow-guiding slope arranged inclined toward the outside.

5. The low air pressure and low air-fuel ratio roller kiln burner according to claim 1, characterized in that: The inner periphery of the opening of the oxidant gas delivery portion is located outside the oxidant gas delivery wind disk and is provided with a second flow guide slope arranged in an inward direction.

6. The low air pressure and low air-fuel ratio roller kiln burner according to claim 1, characterized in that: The primary air nozzles are located in the premixing chamber and are arranged in multiple rows along the axial direction.

7. The low air pressure and low air-fuel ratio roller kiln burner according to any one of claims 1 to 6, characterized in that: The combustion-supporting gas delivery portion is provided with an air intake regulating valve; The air intake regulating valve includes a valve housing, a rotary valve core, and an adjusting handle. The valve housing is provided with a valve housing cavity located on the inner side and an air inlet and an air outlet connected to both ends of the valve housing cavity. A rotating mounting seat is provided in the valve housing cavity. The rotating mounting seat is provided with a rotating active cavity arranged radially along the valve housing cavity. Flow regulating holes connecting the air inlet and the air outlet are respectively provided at both ends of the rotating active cavity. The rotary valve core can be rotatably placed in the rotating active cavity. A valve core cavity arranged radially is provided in the rotary valve core. The adjusting handle is located on the outer side of the valve housing and is transmission-connected to the rotary valve core. By controlling the relative rotation of the rotary valve core, the air flow rate of the valve core cavity and the valve housing cavity is adjusted, thereby adjusting the air intake of the combustion gas delivery channel.

8. The low air pressure and low air-fuel ratio roller kiln burner according to claim 7, characterized in that: The air intake regulating valve also includes a valve cover, which is provided with a avoidance port corresponding to the regulating handle, and the valve housing is provided with an assembly port which is radially open and connected to the rotating active cavity, the rotary valve core is assembled in the rotating active cavity through the assembly port, the inner end of the rotary valve core is assembled in the rotating active cavity through a corrugated spring, the valve cover is connected to the assembly port so that the rotary valve core is placed and fixed in the rotating active cavity, and the valve cover is sealed with the outer end of the rotary valve core through a sealing ring.

9. The low air pressure and low air-fuel ratio roller kiln burner according to claim 7, characterized in that: The regulating handle is provided with a valve position pointer.

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