Special combustor for recycling yellow phosphorus tail gas

Abstract

The invention relates to the technical field of combustors, and discloses a special combustor for recycling yellow phosphorus tail gas, which comprises a flue gas internal circulation bowl cap, a plurality of tail gas channels, a secondary air spray pipe and a tail gas cabin which are sequentially sleeved from inside to outside, the tail gas channels are fixed to the inner wall of the secondary air spraying pipe in a center array mode and internally tangent to the outer wall of the flue gas internal circulation bowl cap, an air channel is formed between every two adjacent tail gas channels, and air is sprayed out after passing through the secondary air spraying pipe and the air channels which are sequentially communicated. Yellow phosphorus tail gas is sprayed out through an interlayer between the tail gas cabin and the secondary air spraying pipe and the tail gas channel and then is mixed with air, the tail gas channel is a flat pipe body and comprises a first pipe body section, a second pipe body section and a third pipe body section which are sequentially connected in a bent mode, and the inlet end of the first pipe body section is communicated with the secondary air spraying pipe; according to the yellow phosphorus tail gas combustion-supporting combustor, yellow phosphorus tail gas and combustion-supporting air can be fully mixed, and the high combustion efficiency of the combustor is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of burners, in particular to a special burner for recycling yellow phosphorus tail gas. Background Art

[0002] Industrial yellow phosphorus can only be produced by thermal methods. For every ton of yellow phosphorus produced, 3,000 standard cubic meters of yellow phosphorus tail gas are generated, of which the carbon monoxide content is as high as 90%, with considerable calorific value. Recycling it as fuel can obtain considerable economic benefits. In addition, in 2009, the state implemented the "Yellow Phosphorus Industry Access Conditions", and phosphorus furnace tail gas must not be directly discharged and burned, and must be recycled and utilized as energy or resources. The comprehensive utilization rate of tail gas from newly built yellow phosphorus devices must reach more than 90%, and the emission of atmospheric pollutants must meet the emission standards for "other furnaces" in the national "Comprehensive Emission Standards for Atmospheric Pollutants from Industrial Furnaces" (GB9078-1996).

[0003] Therefore, how to stably and fully burn yellow phosphorus tail gas, and avoid the burning, erosion and corrosion of the burner front end and boiler equipment by high temperature flame, and realize the energy recovery of yellow phosphorus tail gas has always been a key research topic. The main structure of the current burner for recycling yellow phosphorus tail gas is a diffusion tube direct current burner, which mixes the two media by direct current injection of fuel and air. The medium mixing mode driven by this structure is in a laminar mixing state, the fuel and air cannot be fully mixed, and the two media are not evenly distributed, resulting in unstable combustion temperature. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a special burner for recycling yellow phosphorus tail gas, which can fully mix the yellow phosphorus tail gas with combustion-supporting air to ensure high combustion efficiency of the burner.

[0005] The invention provides a special burner for recycling yellow phosphorus tail gas, comprising a flue gas internal circulation bowl cap, a plurality of tail gas channels, a secondary air nozzle and a tail gas chamber which are sequentially sleeved from the inside to the outside, wherein the plurality of tail gas channels are fixed in a central array around the secondary air nozzle and incise the outer wall of the flue gas internal circulation bowl cap, an air channel is formed between two adjacent tail gas channels, the air is ejected after passing through the sequentially connected secondary air nozzle and the air channel, the yellow phosphorus tail gas is ejected through the interlayer between the tail gas chamber and the secondary air nozzle and the tail gas channel and then mixed with the air, wherein the tail gas channel is a flat tube body, the tail gas channel comprises a first tube body section, a second tube body section and a third tube body section which are sequentially bent and connected, the inlet end of the first tube body section is connected to the secondary air nozzle, and the outlet end of the third tube body section is located at the pipe mouth of the secondary air nozzle.

[0006] Optionally, the second tube body segment is parallel to the secondary air nozzle, one end of the first tube body segment away from the second tube body segment is inclined toward the side close to the secondary air nozzle, and one end of the third tube body segment away from the second tube body segment is inclined toward the side close to the flue gas circulation bowl cap, and there is an angle between the extension direction of the third tube body segment and the extension direction of the second tube body segment, and the third tube body segment inscribes the outer wall of the flue gas circulation bowl cap.

[0007] Optionally, the angle between the first tube body segment and the second tube body segment is 110°-150°, the angle between the extension direction of the second tube body segment and the extension direction of the third tube body segment is 125°-145°, and the inclination angle of the end of the third tube body segment away from the second tube body segment toward the side close to the flue gas circulation bowl cap is 95°-120°.

[0008] Optionally, the number of exhaust channels is greater than twelve.

[0009] Optionally, an exhaust gas connecting pipe is fixedly connected to the outside of the exhaust gas compartment, and the angle between the central axis of the exhaust gas connecting pipe and the central axis of the exhaust gas compartment is 45°, and the yellow phosphorus exhaust gas enters the exhaust gas compartment through the exhaust gas connecting pipe.

[0010] Optionally, the inner circumference of the flue gas circulation bowl cap is coaxially connected to a central air duct, and a secondary air nozzle extends from the first end of the central air duct away from one end of the flue gas circulation bowl cap, and the second end of the central air duct is located in the flue gas circulation bowl cap. A plurality of long air inlet holes are evenly distributed near the second end of the central air duct, and a central air regulating sleeve is provided on the outer peripheral sliding sleeve of the central air duct. As the central air regulating sleeve moves along the radial direction of the central air duct, the covering area of ​​the long air inlet holes is changed, and the air enters the secondary air nozzle and is ejected from the air channel and the central air duct.

[0011] Optionally, the inlet end of the secondary air nozzle is vertically fixedly connected to a secondary air duct, and air enters the secondary air nozzle from the secondary air duct. The air inlet of the secondary air duct is a rectangular opening.

[0012] Optionally, the spray hole cross section of the central air duct is in the shape of a long strip.

[0013] Optionally, a flame stabilizing disk is coaxially connected to the inner periphery of the central air duct, and the outer periphery of the flame stabilizing disk has a plurality of annular arrays of bevel teeth, with a nozzle formed between two adjacent bevel teeth.

[0014] Optionally, a first-stage ignition air gun is fixed at the center of the combustion stabilizing disk, and the outlet end of the first-stage ignition air gun extends out of the combustion stabilizing disk and enters the flue gas circulation bowl cap. A high-energy ignition gun is also fixed at the eccentric position of the combustion stabilizing disk, and the outlet end of the high-energy ignition gun extends out of the combustion stabilizing disk and the flue gas circulation bowl cap.

[0015] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0016] The embodiment of the present invention provides a special burner for recycling yellow phosphorus tail gas. Air is ejected through a secondary air nozzle and an air channel. The yellow phosphorus tail gas is ejected through the interlayer between the tail gas chamber and the secondary air nozzle and the tail gas channel and then mixed with the air. The air channel and the tail gas channel form a radial interlayer channel swirl batcher. The batcher can simultaneously form a coaxial and co-directional layered rotating fuel-air mixed material fluid with the combustion-supporting air and the yellow phosphorus tail gas, which greatly improves the fuel-air mixing uniformity index. In addition, the tail gas channel is in the shape of a flat and bent tube. Both the combustion-supporting air and the yellow phosphorus tail gas can rotate when ejected. The rotating jets of the two media are spaced along the circumference. Layered, with a forward axial velocity and a circumferential tangential velocity, the jet expands forward in a spiral motion and radially mixes with each other, and because the exhaust gas channel includes a bent and connected first tube body section, a second tube body section and a third tube body section, the combustion air and the yellow phosphorus exhaust gas form a certain intensity of rotation, and a central recirculation zone is formed at the front end of the burner, i.e., the front end of the flue gas internal circulation bowl cap, so that the yellow phosphorus exhaust gas is strongly mixed with the combustion air as soon as it exits, and is heated by the flue gas formed in the high-temperature recirculation zone, ensuring stable ignition and combustion. This type of batcher can achieve high combustion efficiency of the burner while also making the fuel-air mixture even for sufficient combustion and reducing pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention;

[0018] Figure 2 A cross-sectional view of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention;

[0019] Figure 3 A partial structural schematic diagram of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention;

[0020] Figure 4 A cross-sectional view of a partial structure of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the overall structure of an exhaust gas channel provided in an embodiment of the present invention;

[0022] Figure 6 A front view of an exhaust gas passage provided by an embodiment of the present invention;

[0023] Figure 7 A top view of an exhaust gas channel provided by an embodiment of the present invention;

[0024] Figure 8 A left side view of an exhaust gas passage provided by an embodiment of the present invention;

[0025] Fig. 9 A cross-sectional view of the matching structure of the central air duct and the central air regulating sleeve provided in an embodiment of the present invention;

[0026] Fig.10 A schematic diagram of the structure of a flame stabilizing disk provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Secondary air duct; 2. Secondary air nozzle; 3. Exhaust gas connecting pipe; 4. Exhaust gas compartment; 5. Exhaust gas channel; 51. First pipe body section; 52. Second pipe body section; 53. Third pipe body section; 6. Central air duct; 7. Central air adjustment sleeve; 8. Flame stabilizing disk; 80. Oblique teeth; 81. Nozzle; 82. First-stage ignition air gun perforation; 83. High-energy ignition gun perforation; 9. First-stage ignition air gun; 10. Flue gas internal circulation bowl cap; 11. High-energy ignition gun; 12. Fire viewing hole; 13. Air channel; 14. Long strip air inlet hole; 15. Pull rod; 16. Threaded sleeve. DETAILED DESCRIPTION

[0029] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] The main structure of the current burner for recycling yellow phosphorus tail gas is a diffusion-type tube-in-tube direct current burner, which mixes the two media by direct current injection of fuel and air. The medium mixing mode driven by this structure is in a laminar mixing state, and the fuel and air cannot be fully mixed. The two media are not evenly distributed, resulting in unstable combustion temperature. In addition, this structure cannot form a recirculation zone (high-temperature flue gas recirculation zone) behind the nozzle, and the jet mixing intensity is weak, resulting in unstable combustion.

[0032] To this end, an embodiment of the present invention provides a special burner for recycling yellow phosphorus tail gas, which can fully mix the yellow phosphorus tail gas with combustion-supporting air to ensure high combustion efficiency of the burner.

[0033] At least one embodiment of the present invention provides a special burner for recycling yellow phosphorus tail gas, comprising a flue gas internal circulation bowl cap, a plurality of tail gas channels, a secondary air nozzle and a tail gas chamber which are sequentially sleeved from the inside to the outside, wherein the plurality of tail gas channels are fixed in a central array around the secondary air nozzle and incise the outer wall of the flue gas internal circulation bowl cap, and an air channel is formed between two adjacent tail gas channels, and the air is ejected after passing through the sequentially connected secondary air nozzles and the air channels, and the yellow phosphorus tail gas is mixed with the air after being ejected through the interlayer between the tail gas chamber and the secondary air nozzle and the tail gas channel, wherein the tail gas channel is a flat tube body, and the tail gas channel comprises a first tube body section, a second tube body section and a third tube body section which are sequentially bent and connected, the inlet end of the first tube body section is connected to the secondary air nozzle, and the outlet end of the third tube body section is located at the pipe mouth of the secondary air nozzle.

[0034] In the special burner for recycling yellow phosphorus tail gas provided by the above-mentioned embodiment of the present invention, by making the air channel and the tail gas channel form a radial sandwich channel swirl feeder, the feeder can simultaneously form a coaxial and co-directional stratified rotating fuel-air mixed material fluid with the combustion-supporting air and the yellow phosphorus tail gas, thereby greatly improving the fuel-air mixing uniformity index.

[0035] The present invention is described below by several specific embodiments. In order to keep the following description of the embodiments of the present invention clear and concise, the detailed description of known functions and known components may be omitted. When any component of the embodiments of the present invention appears in more than one accompanying drawings, the component may be represented by the same reference numeral in each of the accompanying drawings.

[0036] refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 ,in, Figure 1 A three-dimensional diagram of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention, Figure 2 A cross-sectional view of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention, Figure 3 A partial structural schematic diagram of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention, Figure 5 The overall structural diagram of the exhaust gas channel provided by the embodiment of the present invention is as follows: Figure 1As shown, an embodiment of the present invention provides a special burner for recycling yellow phosphorus tail gas, including a flue gas internal circulation bowl cap 10, a plurality of tail gas channels 5, a secondary air nozzle 2 and a tail gas chamber 4 which are sequentially sleeved from the inside to the outside, wherein the plurality of tail gas channels 5 are fixed in a central array on the inner periphery of the secondary air nozzle 2 and incise the outer wall of the flue gas internal circulation bowl cap 10, and an air channel 13 is formed between two adjacent tail gas channels 5, and the air is ejected after passing through the sequentially connected secondary air nozzle 2 and the air channel 13, and the yellow phosphorus tail gas is mixed with the air after being ejected through the interlayer between the tail gas chamber 4 and the secondary air nozzle 2 and the tail gas channel 5, wherein the tail gas channel 5 is a flat tube body, and the tail gas channel 5 includes a first tube body section 51, a second tube body section 52 and a third tube body section 53 which are sequentially bent and connected, the inlet end of the first tube body section 51 is connected to the secondary air nozzle 2, and the outlet end of the third tube body section 53 is located at the pipe mouth of the secondary air nozzle 2, and the tail gas channel 5 can be formed by splicing a plurality of plates.

[0037] The embodiment of the present invention provides a special burner for recycling yellow phosphorus tail gas. Air is ejected through a secondary air nozzle and an air channel. The yellow phosphorus tail gas is ejected through the interlayer between the tail gas chamber and the secondary air nozzle and the tail gas channel and then mixed with the air. The air channel and the tail gas channel form a radial interlayer channel swirl batcher. The batcher can simultaneously form a coaxial and co-directional layered rotating fuel-air mixed material fluid with the combustion-supporting air and the yellow phosphorus tail gas, which greatly improves the fuel-air mixing uniformity index. In addition, the tail gas channel is in the shape of a flat and bent tube. Both the combustion-supporting air and the yellow phosphorus tail gas can rotate when ejected. The rotating jets of the two media are spaced along the circumference. Layered, with a forward axial velocity and a circumferential tangential velocity, the jet expands forward in a spiral motion and radially mixes with each other, and because the exhaust gas channel includes a bent and connected first tube body section, a second tube body section and a third tube body section, the combustion air and the yellow phosphorus exhaust gas form a certain intensity of rotation, and a central recirculation zone is formed at the front end of the burner, i.e., the front end of the flue gas internal circulation bowl cap, so that the yellow phosphorus exhaust gas is strongly mixed with the combustion air as soon as it exits, and is heated by the flue gas formed in the high-temperature recirculation zone, ensuring stable ignition and combustion. This type of batcher can achieve high combustion efficiency of the burner while also making the fuel-air mixture even for sufficient combustion and reducing pollutant emissions.

[0038] refer to Figure 6 , Figure 7 and Figure 8 ,in, Figure 6 A front view of an exhaust gas passage provided by an embodiment of the present invention, Figure 7 A top view of an exhaust gas channel provided by an embodiment of the present invention, Figure 8The left view of the exhaust gas channel provided in an embodiment of the present invention, the second pipe body section 52 is parallel to the secondary air nozzle 2, the end of the first pipe body section 51 away from the second pipe body section 52 is inclined toward the side close to the secondary air nozzle 2, the end of the third pipe body section 53 away from the second pipe body section 52 is inclined toward the side close to the flue gas internal circulation bowl cap 10, and there is an angle between the extension direction of the third pipe body section 53 and the extension direction of the second pipe body section 52, and the third pipe body section 53 inscribes the outer wall of the flue gas internal circulation bowl cap 10.

[0039] By setting the exhaust gas channel in the above manner, the maximum axial speed of the rotating jet can be accelerated, the expansion angle is larger, and the rotating jets at the nozzle mutually entrain the surrounding medium, so that the air and yellow phosphorus exhaust gas are better mixed, and the fuel thermal energy of the yellow phosphorus exhaust gas can be fully utilized. The low-load combustion stability is high, the adjustment ratio is large, and the flame rigidity is excellent. At the same time, the high-temperature flame is effectively avoided to a large extent. The combustion, erosion and corrosion of the burner front end and boiler equipment, greatly improving the resource utilization of yellow phosphorus exhaust gas in the long run.

[0040] Specifically, the angle between the first tube body segment 51 and the second tube body segment 52 is 110°-150°, the angle between the extension direction of the second tube body segment 52 and the extension direction of the third tube body segment 53 is 125°-145°, and the inclination angle of the end of the third tube body segment 53 away from the second tube body segment 52 toward the side close to the flue gas circulation bowl cap 10 is 95°-120°. Within the above-mentioned angle range, the swirl intensity is optimal, the flame fullness is good, the mixing is uniform, and the combustion effect is better.

[0041] Reference again Figure 3 The number of exhaust channels 5 is greater than 12. The number of exhaust channels 5 is designed according to the gas processing capacity. If the number of exhaust channels 5 is too large, the equipment structure will be complicated and the weight will be too large. If the number of exhaust channels 5 is too small, the swirl intensity will be weak and the mixing effect will be poor. In this embodiment, the preferred number of exhaust channels 5 is 18, so as to ensure that the channel area ratio of fuel to air is moderate.

[0042] refer to Figure 1 or Figure 3 An exhaust gas pipe 3 is fixedly connected to the outside of the exhaust gas compartment 4 , and the angle between the central axis of the exhaust gas pipe 3 and the central axis of the exhaust gas compartment 4 is 45°. The yellow phosphorus exhaust gas enters the exhaust gas compartment 4 through the exhaust gas pipe 3 .

[0043] The exhaust chamber 4 and the cylindrical secondary air nozzle 2 form a coaxial sandwich combustion chamber. The secondary air nozzle 2 has evenly opened holes to allow air to enter the secondary air nozzle 2 from the sandwich formed by the exhaust chamber 4 and the secondary air nozzle 2. The angle between the central axis of the exhaust gas connecting pipe 3 and the central axis of the exhaust chamber 4 is 45°, which is convenient for installation. In addition, if the angle is too large, the gas pipe will be easily damaged, which is not conducive to the mixing intensity of the rotating jet at the nozzle. If the angle is too small, it will be not conducive to on-site installation. The exhaust gas connecting pipe 3, the exhaust chamber 4, and the secondary air nozzle 2 are connected to form a complete gas channel, thereby sending the yellow phosphorus exhaust gas into the exhaust channel 5.

[0044] refer to Figure 3 , Figure 4 and Fig. 9 ,in, Figure 4 A cross-sectional view of a partial structure of a special burner for recycling yellow phosphorus tail gas provided by an embodiment of the present invention, Fig. 9 A cross-sectional view of the matching structure of the central air duct and the central air regulating sleeve provided in an embodiment of the present invention, as shown in FIG. Figure 3 , Figure 4 and Fig. 9 As shown, the inner circumference of the flue gas circulation bowl cap 10 is coaxially connected with the central air duct 6, the first end of the central air duct 6 extends out of the end of the secondary air nozzle 2 away from the flue gas circulation bowl cap 10, the second end of the central air duct 6 is located in the flue gas circulation bowl cap 10, and the central air duct 6 is evenly distributed with a plurality of long strip air inlet holes 14 near the second end. The outer circumference of the central air duct 6 is slidably sleeved with a central air regulating sleeve 7. As the central air regulating sleeve 7 moves along the radial direction of the central air duct 6, the covering area of ​​the long strip air inlet holes 14 is changed, and the air enters the secondary air nozzle 2 and is ejected from the air channel 13 and the central air duct 6. In this embodiment, the central air regulating sleeve 7 is connected to the screw nut assembly to drive the central air regulating sleeve 7 along the central air duct 6. Fig. 9 Specifically, by fixing the nut 16 in the screw-nut assembly, the central wind regulating sleeve 7 is rotatably connected with the lead screw 15 in the lead screw-nut assembly, the central wind regulating sleeve 7 is limited so that it can only move horizontally, and the lead screw 15 is limited so that it can only move in the horizontal direction. By adjusting the position of the central wind regulating sleeve 7, the covering area of ​​the long strip air inlet hole 14 is changed, thereby changing the air intake amount, thereby further ensuring the full mixing and combustion of the yellow phosphorus tail gas and the air.

[0045] Reference again Figure 3 The inlet end of the secondary air nozzle 2 is vertically fixed and connected with the secondary air duct 1, the secondary air duct 1 is connected to the secondary air inlet, the air enters the secondary air nozzle 2 from the secondary air duct 1, the air inlet of the secondary air duct 1 is a rectangular opening, and the air inlet of the rectangular secondary air duct 1 is a rectangular opening, which is better arranged and installed, and the air intake volume is large.

[0046] Specifically, in this embodiment, the cross section of the nozzle of the central air duct 6 is long and strip-shaped, thereby forming a smoke reflow zone to protect the small flame.

[0047] refer to Fig.10 , Fig.10 A schematic diagram of the structure of a combustion stabilizing disk provided in an embodiment of the present invention, as shown in FIG. Fig.10 As shown, the inner circumference of the central air duct 6 is coaxially connected with a stabilizing disk 8, and the outer circumference of the stabilizing disk 8 has a plurality of annular arrays of bevel teeth 80, and nozzles 81 are formed between two adjacent bevel teeth 80. In the present embodiment, the number of nozzles 81 is greater than 10, and this number is calculated based on the medium flow rate. If the number is too small, it is not enough to form a rotating jet, the mixing is not good, and the combustion stability is poor. After the central wind passes through the bevel teeth 80 of the stabilizing disk 8, radial and axial winds are formed, forming a rotation of a certain intensity, and a central recirculation area is formed at the front end of the flue gas circulation bowl cap 10, which has a stabilizing effect.

[0048] Reference again Figure 4 and Fig.10 The center of the stable combustion disk 8 is provided with a primary ignition air gun perforation 82, and the primary ignition air gun 9 is fixed to the primary ignition air gun perforation 82. The outlet end of the primary ignition air gun 9 extends out of the stable combustion disk 8 and enters the flue gas internal circulation bowl cap 10. The flue gas internal circulation bowl cap 10 is a shield structure, forming a flue gas recirculation zone to protect the small flame. The shape can be cylindrical, scaled, or contracted. The eccentric position of the stable combustion disk 8 is also provided with a high-energy ignition gun perforation 83, and the high-energy ignition gun perforation 83 is fixed with a high-energy ignition gun 11. The high-energy ignition gun 11 A combustion stabilizing disk 8 and a flue gas circulation bowl cap 10 extend from the outlet end, a high-energy ignition gun 11 forms a high-energy arc spark to ignite the fuel, a plurality of long strip air inlet holes 14 are evenly distributed at the root of the central air duct 6, a central air regulating sleeve 7 is coaxially mounted outside the central air duct 6, and the air intake volume is controlled by adjusting the flow area of ​​the central air regulating sleeve 7 covering the long strip air inlet holes 14, a combustion stabilizing disk 8 is installed at the front end nozzle of the central air duct 6, a first-level ignition air gun 9 is coaxially mounted, and the head of the ignition air gun is higher than the combustion stabilizing disk 8, forming a complete central ignition device. In the same situation, the central wind forms a certain intensity of rotation through the stable combustion disk 8, and forms a central recirculation zone at the front end of the flue gas internal circulation bowl cap 10. The fire viewing holes 12 are arranged in a four-point manner. The central wind forms a certain intensity of rotation through the stable combustion disk 8, and forms a central recirculation zone at the front end of the flue gas internal circulation bowl cap 10. The gas of the first-level ignition air gun 9 is strongly mixed with the combustion-supporting air as soon as it is exported, and is heated by the flue gas in the high-temperature recirculation zone to ensure stable ignition and combustion. The root wind is timely delivered through the long strip air inlet hole 14 on the central air duct 6 to become a stable first-level ignition gun. In addition, the central wind increases the rigidity of the gas of the first-level ignition air gun 9, prevents gas scattering, and supplements the air volume to reduce the loss of incomplete carbon combustion. At the same time, the end flame temperature is reduced, the formation of harmful gases such as nitrogen oxides is reduced, and the combustion, erosion and corrosion of the front end of the burner and boiler equipment by the high-temperature flame are effectively avoided.

[0049] The invention provides a special burner for recycling yellow phosphorus tail gas, which can not only well solve the problem of stable combustion of yellow phosphorus tail gas and avoid flame misfire, so that the yellow phosphorus tail gas and combustion-supporting air are fully mixed and burned completely, but also well solve the problem of combustion, scouring and corrosion of the front end of the burner and boiler equipment by high-temperature flame, and reduce the generation of nitrogen oxides in the combustion process to a certain extent.

[0050] The above inventions are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A special burner for recycling yellow phosphorus tail gas, characterized in that: The invention comprises a flue gas internal circulation bowl cap (10), a plurality of tail gas channels (5), a secondary air nozzle (2) and a tail gas chamber (4) which are sequentially sleeved from the inside to the outside. The plurality of tail gas channels (5) are fixed in a central array on the inner periphery of the secondary air nozzle (2) and incise the outer wall of the flue gas internal circulation bowl cap (10). An air channel (13) is formed between two adjacent tail gas channels (5). The air is ejected through the sequentially connected secondary air nozzle (2) and the air channel (13). The yellow phosphorus tail gas is ejected through the interlayer between the tail gas chamber (4) and the secondary air nozzle (2) and the tail gas channel (5) and then mixed with the air. The exhaust gas channel (5) is in the form of a flat tube body, and comprises a first tube body section (51), a second tube body section (52), and a third tube body section (53) which are bent and connected in sequence, the inlet end of the first tube body section (51) is connected to the secondary air nozzle (2), and the outlet end of the third tube body section (53) is located at the nozzle of the secondary air nozzle (2).

2. A special burner for recycling yellow phosphorus tail gas as claimed in claim 1, characterized in that: The second tube body section (52) is parallel to the secondary air nozzle (2); the end of the first tube body section (51) away from the second tube body section (52) is inclined toward the side close to the secondary air nozzle (2); the end of the third tube body section (53) away from the second tube body section (52) is inclined toward the side close to the flue gas internal circulation bowl cap (10); and there is an angle between the extension direction of the third tube body section (53) and the extension direction of the second tube body section (52); the third tube body section (53) inscribes the outer wall of the flue gas internal circulation bowl cap (10).

3. A special burner for recycling yellow phosphorus tail gas as claimed in claim 2, characterized in that: The included angle between the first tube body segment (51) and the second tube body segment (52) is 110°-150°, the included angle between the extension direction of the second tube body segment (52) and the extension direction of the third tube body segment (53) is 125°-145°, and the inclination angle of the end of the third tube body segment (53) away from the second tube body segment (52) toward the side close to the flue gas circulation bowl cap (10) is 95°-120°.

4. A special burner for recycling yellow phosphorus tail gas as claimed in claim 1, characterized in that: The number of the exhaust gas channels (5) is greater than 12.

5. A special burner for recycling yellow phosphorus tail gas as claimed in claim 1, characterized in that: An exhaust gas connecting pipe (3) is fixedly connected to the outside of the exhaust gas chamber (4); the included angle between the central axis of the exhaust gas connecting pipe (3) and the central axis of the exhaust gas chamber (4) is 45°; and the yellow phosphorus exhaust gas enters the exhaust gas chamber (4) through the exhaust gas connecting pipe (3).

6. A special burner for recycling yellow phosphorus tail gas as claimed in claim 1, characterized in that: The inner periphery of the flue gas internal circulation bowl cap (10) is coaxially connected to a central air duct (6); a first end of the central air duct (6) extends out from an end of the secondary air nozzle (2) away from the flue gas internal circulation bowl cap (10); a second end of the central air duct (6) is located in the flue gas internal circulation bowl cap (10); a plurality of long strip air inlet holes (14) are evenly distributed near the second end of the central air duct (6); a central air regulating sleeve (7) is slidingly sleeved on the outer periphery of the central air duct (6); as the central air regulating sleeve (7) moves radially along the central air duct (6), the covering area of ​​the long strip air inlet holes (14) is changed, and air enters the secondary air nozzle (2) and is ejected from the air channel (13) and the central air duct (6).

7. A special burner for recycling yellow phosphorus tail gas as claimed in claim 6, characterized in that: The inlet end of the secondary air nozzle (2) is vertically fixedly connected to the secondary air duct (1), and air enters the secondary air nozzle (2) from the secondary air duct (1). The air inlet of the secondary air duct (1) is a rectangular opening.

8. A special burner for recycling yellow phosphorus tail gas as claimed in claim 6, characterized in that: The spray hole cross section of the central air duct (6) is in the shape of an elongated strip.

9. A special burner for recycling yellow phosphorus tail gas as claimed in claim 6, characterized in that: The inner periphery of the central air duct (6) is coaxially connected to a combustion stabilizing disk (8), and the outer periphery of the combustion stabilizing disk (8) has a plurality of annular arrays of oblique teeth (80), with a nozzle (81) formed between two adjacent oblique teeth (80).

10. A special burner for recycling yellow phosphorus tail gas as claimed in claim 9, characterized in that: A first-stage ignition air gun (9) is fixed at the center of the combustion stabilizing disk (8), and the outlet end of the first-stage ignition air gun (9) extends out of the combustion stabilizing disk (8) and enters the flue gas internal circulation bowl cap (10). A high-energy ignition gun (11) is also fixed at an eccentric position of the combustion stabilizing disk (8), and the outlet end of the high-energy ignition gun (11) extends out of the combustion stabilizing disk (8) and the flue gas internal circulation bowl cap (10).

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