Multilayer dispersion combustion, high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner and multi-stage combustion method

Abstract

The application discloses a multi-layer dispersion combustion, high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner and a multi-stage combustion method, and belongs to the technical field of energy saving and environmental protection. The mounting flange of the burner is connected with a furnace chamber. The burner comprises a cylinder body, the cylinder body is divided into a fuel cavity and a combustion-supporting cavity which are relatively independent through a transverse partition plate, the fuel cavity is used for conveying yellow phosphorus tail gas, and the combustion-supporting cavity is used for conveying high-pressure and high-speed combustion-supporting air. A center gun is arranged at the center of the cylinder body, an inlet end of the center gun is communicated with the fuel cavity, a plurality of layers of spray gun pipes are arranged, nozzles of a part of the spray gun pipes are staggered in height, and the nozzles of the spray gun pipes are oriented in different directions; a part of the spray gun pipes are provided with rotating blades; an air automatic rotating assembly is arranged at the outer periphery of an outlet end of the center gun and is communicated with the combustion-supporting cavity, and the air automatic rotating assembly is used for automatically and rapidly rotating the combustion-supporting air, so that the combustion-supporting air and the yellow phosphorus tail gas are fully mixed. The application solves the problems of yellow phosphorus tail gas ultra-low NOx and CO emission and yellow phosphorus tail gas blockage.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy saving and environmental protection, and particularly relates to a multi-layer dispersed combustion, high-efficiency energy-saving low-nitrogen yellow phosphorus tail gas burner and a multi-stage combustion method. BACKGROUND

[0002] Yellow phosphorus is an extremely important strategic basic industrial raw material, China is rich in phosphate rock resources, and is the largest yellow phosphorus producer in the world, with a production accounting for more than 80% of the world, and yellow phosphorus production can only be produced by a hot method, and 3000 standard cubic meters of yellow phosphorus tail gas is generated per ton of yellow phosphorus, and the CO content is as high as 85%, CO is an important raw material for carbonization industry, and is also a typical greenhouse gas, but the yellow phosphorus tail gas is discharged for a long time due to the lack of purification and perfect combustion technology, resulting in serious resource waste and serious air pollution. SUMMARY

[0003] In order to solve the above problems, the application adopts the following technical scheme:

[0004] A multi-layer dispersed combustion, high-efficiency energy-saving low-nitrogen yellow phosphorus tail gas burner, the mounting flange of the burner is connected with the hearth, and the burner comprises:

[0005] A cylinder, the cylinder is divided into a fuel cavity and a combustion-supporting cavity which are relatively independent by a transverse partition plate, the fuel cavity is used for conveying yellow phosphorus tail gas, and the combustion-supporting cavity is used for conveying high-pressure high-speed combustion-supporting wind, the fuel cavity is provided with a blowdown port, and the combustion-supporting cavity is provided with a fire detection assembly and a fire observation port;

[0006] A center gun, the center gun is arranged at the center of the cylinder, the inlet end of the center gun is communicated with the fuel cavity, and the outlet end of the center gun is internally provided with corrugated swirl vanes, which are used for spraying yellow phosphorus tail gas and changing the straight flow wind of the center into vortex flow wind, and an automatic telescopic ignition gun assembly penetrates into the center gun;

[0007] A plurality of multi-layer spray gun pipes, the plurality of multi-layer spray gun pipes are concentrically distributed outward in sequence at the outer periphery of the center gun, the nozzles of a part of the spray gun pipes are staggered in height, and the orientations of the spray pipes are different, and the other part of the spray gun pipes are provided with rotating vanes;

[0008] An air automatic rotating assembly, the air automatic rotating assembly is arranged at the outer periphery of the outlet end of the center gun and is communicated with the combustion-supporting cavity, and is used for conveying combustion-supporting air, and the air automatic rotating assembly is used for automatically rotating the combustion-supporting wind at high speed, so that the combustion-supporting wind and the yellow phosphorus tail gas are fully mixed.

[0009] Further, the fuel cavity is divided into independent center air inlet cavity, left air inlet cavity and right air inlet cavity by the partition plate, the center air inlet cavity is communicated with the center yellow phosphorus tail gas inlet at the air inlet end, the left air inlet cavity is communicated with the left yellow phosphorus tail gas inlet at the air inlet end, and the right air inlet cavity is communicated with the right yellow phosphorus tail gas inlet at the air inlet end.

[0010] Further, the center gun further comprises:

[0011] The outer gun barrel is communicated with the center air inlet cavity at the first end, and the second end of the outer gun barrel is a venturi tube;

[0012] The inner gun barrel penetrates into the inner cavity of the outer gun barrel, and one end of the automatic telescopic ignition gun assembly penetrates into the inner gun barrel;

[0013] The corrugated spiral flow sheet is arranged between the outer gun barrel and the inner gun barrel and located at one end close to the venturi tube.

[0014] Further, the cylinder is provided with a combustion-supporting air distribution plate, the combustion-supporting air distribution plate and the transverse partition plate form a combustion-supporting cavity, the center of the combustion-supporting air distribution plate is provided with a first through hole, and a plurality of second through holes are distributed at other positions.

[0015] Further, the air automatic rotation assembly further comprises:

[0016] The outer cylinder is rotatably sleeved on the outside of the venturi tube, and the end of the first end of the outer cylinder is connected to the first through hole;

[0017] The rotating folding blade is arranged between the outer cylinder and the venturi tube and connected to the venturi tube through a high-temperature eccentric bearing.

[0018] Further, it further comprises:

[0019] At least two layers of automatic rotating spray gun groups are concentrically distributed outward on the outer periphery of the center gun, each layer of the automatic rotating spray gun group comprises a plurality of automatic rotating spray guns arranged in the circumferential direction;

[0020] At least one layer of special spray gun groups is concentrically distributed on the outer periphery of the center gun and located between adjacent two layers of automatic rotating spray gun groups, each layer of the special spray gun group comprises a plurality of special spray guns arranged in the circumferential direction, and the plurality of automatic rotating spray guns and the plurality of special spray guns are staggered, the nozzles of the plurality of special spray guns are staggered in height, and the orientations of the plurality of special spray guns are different.

[0021] Further, the automatic rotating spray gun comprises:

[0022] The first gun barrel is connected with a first lance expansion pipe at a first end, and a large-diameter end of the first lance expansion pipe is communicated with the left air inlet cavity or the right air inlet cavity;

[0023] A rotating cylinder is rotatably connected to the second end of the gun barrel, and a high-temperature eccentric bearing and a needle bearing are installed between the gun barrel and the rotating cylinder, the rotating vane is arranged at an end of the rotating cylinder away from the gun barrel, and a rotating direction of the rotating vane is opposite to that of the rotating folding vane.

[0024] Further, the special lance comprises:

[0025] The second gun barrel is connected with a second lance expansion pipe at a first end, and a large-diameter end of the second lance expansion pipe is communicated with the left air inlet cavity or the right air inlet cavity;

[0026] A special nozzle is a 45° elbow and is connected to the second end of the second gun barrel, and the special nozzle is provided with spray holes of different angles and different diameters.

[0027] Further, the left air inlet cavity is hingedly connected with a left bottom cover, the right air inlet cavity is hingedly connected with a right bottom cover, the left automatic vapor purging gun group is arranged on the left bottom cover, the right automatic vapor purging gun group is arranged on the right bottom cover, the automatic vapor purging guns in the left automatic vapor purging gun group correspond to the first gun barrels and the second gun barrels connected with the left air inlet cavity, the automatic vapor purging guns in the right automatic vapor purging gun group correspond to the first gun barrels and the second gun barrels connected with the right air inlet cavity, and the left automatic vapor purging gun group and the right automatic vapor purging gun group are respectively connected with a high-temperature steam device.

[0028] A multi-stage combustion method is provided, and the multi-layer dispersion combustion and high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner is used.

[0029] S1, the outlet of the burner is connected with a furnace, and excess yellow phosphorus tail gas and appropriate air are injected into the front section of the furnace, so that the yellow phosphorus tail gas is insufficiently combusted, at this time, anaerobic combustion is formed; nitrogen in the air cannot react with oxygen, NOx cannot be generated, the temperature of the flame region is reduced, and a low-temperature zone is formed;

[0030] S2, combustion-supporting air is supplemented into the furnace through an air duct in the middle section or the rear section of the furnace, oxygen-rich combustion is formed, and CO in the yellow phosphorus tail gas that is not completely combusted in the front section is completely combusted again with the supplemented combustion-supporting air.

[0031] Beneficial effects:

[0032] The present application solves the problems of ultra-low NOx and CO emission of yellow phosphorus tail gas combustion, and solves the problem of yellow phosphorus tail gas blockage.

[0033] The combustor adopts multi-section and multi-layer dispersion combustion, the front section adopts anaerobic combustion, the rear section adopts oxygen-rich combustion, and fuel is sprayed to the periphery of the furnace chamber for multi-section and multi-layer dispersion combustion.

[0034] The combustion-supporting air adopts automatic cyclone air and uniform air distribution system; the yellow phosphorus tail gas nozzle is designed to automatically rotate the spray gun, special multi-spray gun pipe, staggered nozzle height, and different spray pipe orientation; meanwhile, fuel staging, flue gas internal circulation and other low-nitrogen combustion technologies are adopted. The flame fills the entire furnace chamber as much as possible, vortex rotating flame is formed in the entire furnace chamber, there is no central flame, the average temperature and peak temperature of the flame are reduced, and the FGR circulating flue gas system is adopted to reduce the generation of NOx. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a schematic view of the overall structure of the present application;

[0036] Figure 2 It is a schematic view of the overall structure of the present application;

[0037] Figure 3 It is a schematic view of the overall structure of the present application;

[0038] Figure 4 It is a schematic view of the internal structure of the air automatic rotation assembly of the present application;

[0039] Figure 5 It is a schematic view of the structure of the rotating folding blade of the present application;

[0040] Figure 6 It is a schematic view of the main view of the automatic rotating spray gun of the present application;

[0041] Figure 7 It is a schematic view of the automatic rotating spray gun of the present application;

[0042] Figure 8 It is a schematic view of the main view of the structure of the special spray gun of the present application;

[0043] Figure 9 It is a schematic view of the structure of the special spray gun of the present application;

[0044] Figure 10 It is a schematic view of the main view of the structure of the center gun of the present application;

[0045] Figure 11 It is a schematic view of the structure of the center gun of the present application;

[0046] Figure 12 It is a schematic view of the structure of the steam blowing gun of the present application;

[0047] Figure 13Three-dimensional view of the front of the burner of the present application Figure 1 ;

[0048] Figure 14 Three-dimensional view of the front of the burner of the present application Figure 2 ;

[0049] Figure 15 Three-dimensional view of the front of the burner of the present application

[0050] Figure 16 Three-dimensional view of the front of the burner of the present application

[0051] Wherein, 1, air automatic rotating assembly; 2, automatic rotating lance; 3, special lance; 4, combustion air distribution plate; 5, cylinder; 6, center lance; 7, flame detector; 8, fuel cavity; 9, vapor purging lance; 10, automatic telescopic ignition lance; 11, blowdown port; 12, partition plate; 13, outer cylinder; 14, high-temperature bearing; 15, rotating folding vane; 16, first lance pipe; 17, first lance expansion pipe; 18, rotating cylinder; 19, high-temperature eccentric bearing; 20, needle bearing; 21, rotating vane; 22, second lance pipe; 23, second lance expansion pipe; 24, special spray head; 25, spray hole; 26, venturi; 27, outer lance pipe; 28, inner lance pipe; 29, corrugated swirl vane; 30, quick coupling; 31, high-temperature lance; 32, fixed block; 33, graphite packing; 34, cover plate; 35, bolt and nut; 36, ball valve; 37, observation port. DETAILED DESCRIPTION

[0052] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the accompanying drawings, the role of the drawings is to supplement the description of the text part with figures, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0054] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0055] In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If the first, second is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0056] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0057] Embodiment 1

[0058] Reference Figures 1-16 A multi-layer dispersion combustion, high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner, the mounting flange of the burner is connected with the furnace, and the burner comprises:

[0059] The cylinder 5 is divided into a fuel cavity 8 and a combustion-supporting cavity by a transverse partition plate, the fuel cavity 8 is used for conveying yellow phosphorus tail gas, the combustion-supporting cavity is used for conveying high-pressure high-speed combustion-supporting wind, the fuel cavity 8 is provided with a blowdown port 11, and the combustion-supporting cavity is provided with a double-fire detector 7 assembly and a fire observation port 37;

[0060] The center gun 6 is arranged at the center of the cylinder 5, the inlet end of the center gun 6 is communicated with the fuel cavity 8, the outlet end of the center gun 6 is internally provided with corrugated swirl vanes 29, which are used for changing the straight-flow wind of the center yellow phosphorus tail gas into vortex flow wind, and the automatic telescopic ignition gun 10 assembly penetrates into the center gun 6;

[0061] The multi-layer spray gun pipe is concentrically distributed outward in sequence at the outer periphery of the center gun 6, the nozzles of a part of the spray gun pipes are staggered in height, and the orientations of the spray pipes are different; another part is at least partially provided with rotating vanes 21;

[0062] The air automatic rotation assembly 1 is arranged at the outer periphery of the outlet end of the center gun 6 and is communicated with the combustion-supporting cavity, and is provided with rotating folding vanes 15, which are used for automatically rotating the combustion-supporting wind at high speed, so that the combustion-supporting wind and the yellow phosphorus tail gas are fully mixed.

[0063] In specific implementation, the blowdown port 11 is connected with an overflow valve.

[0064] In specific implementation, the air automatic rotation assembly 1 can automatically rotate the vortex flow wind to drive the straight-flow wind around the periphery to rotate together.

[0065] The present application uses yellow phosphorus tail gas as fuel, and is applied to heating furnace equipment such as balance furnace, hot blast furnace, boiler, power generation, industrial kiln, civil heating, etc., and conforms to top burning type, side burning type, blue and yellow circular vortex multi-level flame.

[0066] Embodiment 2

[0067] In order to improve practicability, the present embodiment makes further settings on the basis of embodiment 1.

[0068] In the present embodiment, the fuel cavity 8 is divided into a center air inlet cavity, a left air inlet cavity and a right air inlet cavity by the partition plate 12, the air inlet end of the center air inlet cavity is communicated with the center yellow phosphorus tail gas inlet, the air inlet end of the left air inlet cavity is communicated with the left yellow phosphorus tail gas inlet, and the air inlet end of the right air inlet cavity is communicated with the right yellow phosphorus tail gas inlet.

[0069] In the present embodiment, the center gun 6 comprises:

[0070] The outer gun tube 27, the first end of the outer gun tube 27 is communicated with the center air inlet cavity, and the second end of the outer gun tube 27 is the venturi tube 26;

[0071] The inner gun tube 28, the inner gun tube 28 penetrates into the inner cavity of the outer gun tube 27, and the automatic telescopic ignition gun 10 assembly penetrates into the inner gun tube 28;

[0072] Among them, the corrugated spiral flow sheet 29 is arranged between the outer gun tube 27 and the inner gun tube 28, and is located at one end close to the venturi tube 26.

[0073] In the present embodiment, the cylinder body 5 is provided with a combustion-supporting air distribution plate 4, the combustion-supporting air distribution plate 4 and the transverse partition plate form a combustion-supporting cavity, the center of the combustion-supporting air distribution plate 4 is provided with a first through hole, and a plurality of second through holes are distributed at other positions.

[0074] In specific implementation, the special center gun 6 is composed of the venturi tube 26 and the corrugated spiral flow sheet 29; the center straight flow wind is changed into vortex flow wind, the wind pressure and wind speed of the center vortex flow wind are increased, the peripheral wind and the yellow phosphorus tail gas are disturbed, and the air and the yellow phosphorus tail gas are mixed more fully and more dispersedly.

[0075] In the present embodiment, the air automatic rotation assembly 1 further comprises:

[0076] The outer cylinder 13, the outer cylinder 13 is rotatably sleeved outside the venturi tube 26, and the end portion of the first end of the outer cylinder 13 is connected to the first through hole;

[0077] The rotating folding blade 15, the rotating folding blade 15 is arranged between the outer cylinder 13 and the venturi tube 26, and is connected to the venturi tube 26 through the high-temperature eccentric bearing 19.

[0078] In the embodiment, the high-speed and high-pressure central combustion-supporting air enters the cylinder of the outer cylinder 13, pushes the special structure of the folding blade, and makes the folding blade rotate at high speed under the driving of the high-speed and high-pressure air. Meanwhile, the air forms strong vortex air in the high-speed rotating folding blade 15. The vortex air drives the peripheral straight-flow air to rotate, so that the whole combustion-supporting air rotates in the opposite direction of the yellow phosphorus tail gas, so that the yellow phosphorus tail gas is fully mixed with the combustion-supporting air and burns, and the flame gathering point is better reduced, the yellow phosphorus tail gas is more dispersedly burned, and the NOx generation point is effectively reduced.

[0079] In the embodiment, the automatic rotating spray gun 2 comprises:

[0080] The automatic rotating spray gun 2 comprises:

[0081] The automatic rotating spray gun 2 comprises:

[0082] In the embodiment, the automatic rotating spray gun 2 comprises:

[0083] In the embodiment, the automatic rotating spray gun 2 comprises:

[0084] The first gun barrel 16 is connected with the first spray gun expansion pipe 17 at the first end, and the large-diameter end of the first spray gun expansion pipe 17 is in communication with the left or right air inlet cavity.

[0085] The rotating cylinder 18 is rotatably connected to the second end of the gun barrel, and the high-temperature eccentric bearing 19 and the needle bearing 20 are installed between the gun barrel and the rotating cylinder 18.

[0086] The rotating blade 21 is arranged at the end of the rotating cylinder 18 away from the gun barrel, and the rotating direction of the rotating blade 21 is opposite to that of the rotating folding blade 15.

[0087] In the embodiment, the high-speed and high-pressure central combustion-supporting air enters the cylinder of the outer cylinder 13, pushes the special structure of the folding blade, and makes the folding blade rotate at high speed under the driving of the high-speed and high-pressure air. Meanwhile, the air forms strong vortex air in the high-speed rotating folding blade 15. The vortex air drives the peripheral straight-flow air to rotate, so that the whole combustion-supporting air rotates in the opposite direction of the yellow phosphorus tail gas, so that the yellow phosphorus tail gas is fully mixed with the combustion-supporting air and burns, and the flame gathering point is better reduced, the yellow phosphorus tail gas is more dispersedly burned, and the NOx generation point is effectively reduced.

[0088] In specific implementation, the automatic rotating spray gun is composed of the rotating blade 21, the rotating cylinder 18, the needle bearing 20, the high-temperature bearing 14, the fixed seat, the first gun barrel 16 and the first spray gun expansion pipe 17. The high-pressure yellow phosphorus tail gas is pushed by the high-pressure airflow to rotate the rotating blade 21, and the yellow phosphorus tail gas is also rotated with the rotating blade vortex, so that the yellow phosphorus tail gas is more dispersed and mixed with air more uniformly; the flame high-temperature zone cannot be formed, and NOx cannot be generated.

[0089] In specific implementation, the automatic rotating yellow phosphorus tail gas drives the dispersed yellow phosphorus tail gas around to rotate together; the rotating direction of the yellow phosphorus tail gas is opposite to the rotating direction of the combustion-supporting wind, so that the yellow phosphorus tail gas and the combustion-supporting wind are fully mixed and burned; the flame gathering point is better reduced, the yellow phosphorus tail gas is more dispersed and burned, and the NOx generation point is effectively reduced.

[0090] In the embodiment, the special spray gun 3 comprises:

[0091] The second gun barrel 22 is connected with the second spray gun expansion pipe 23 at the first end, and the large-diameter end of the second spray gun expansion pipe 23 is in communication with the left air inlet chamber or the right air inlet chamber;

[0092] The special spray head 24 is a 45° elbow and is connected to the second end of the second gun barrel 22, and the special spray head 24 is provided with spray holes 25 of different angles and different diameters.

[0093] In specific implementation, since the yellow phosphorus tail gas is generally not purified, it is easy to cause the spray pipe to be blocked; therefore, the automatic steam blowing assembly, the automatic pollution and drainage purification treatment mechanism are designed on the burner;

[0094] In the embodiment, the left air inlet chamber is hinged with a left bottom cover, and the right air inlet chamber is hinged with a right bottom cover; the left bottom cover is provided with a left automatic steam blowing gun group, and the right bottom cover is provided with a right automatic steam blowing gun group; the automatic steam blowing guns 9 in the left automatic steam blowing gun group on the left bottom cover are correspondingly arranged with the plurality of first gun barrels 16 and the second gun barrels 22 connected with the left air inlet chamber, and the automatic steam blowing guns 9 in the right automatic steam blowing gun group on the right bottom cover are correspondingly arranged with the plurality of first gun barrels 16 and the second gun barrels 22 connected with the right air inlet chamber; the left automatic steam blowing gun group and the right automatic steam blowing gun group are respectively connected with high-temperature steam equipment.

[0095] In specific implementation, the fuel cavity 8 is divided into the center air inlet chamber, the left air inlet chamber and the right air inlet chamber by the partition plate 12; the left air inlet chamber and the right air inlet chamber are symmetrically arranged; the air inlet end of the center air inlet chamber is in communication with a center yellow phosphorus tail gas feeding port, the air inlet end of the left air inlet chamber is in communication with a left yellow phosphorus tail gas feeding port, and the air inlet end of the right air inlet chamber is in communication with a right yellow phosphorus tail gas feeding port; the center yellow phosphorus tail gas feeding port can ensure stable flame combustion.

[0096] When the lance needs to be cleaned after one cycle, the furnace is not stopped, one side of the quick cut-off valve is automatically closed, the center fire and the other side fire continue to burn stably, and the corresponding automatic high-temperature steam purging system is opened to purge the fuel chamber 8 and the lance.

[0097] In specific implementation, an independent automatic purging system is designed, and each lance is provided with a corresponding purging lance; 2 to N purging lances form a group, and each group is quickly connected with high-temperature steam.

[0098] In specific implementation, in order to facilitate opening of the rear cover during maintenance, the rear cover plate is provided with a hinge mechanism.

[0099] In specific implementation, the present application simultaneously designs a double-fire detector 7, a temperature control system, an automatic ignition system, an automatic purging system, an automatic leak detection system, a fuel pressure stabilizing system, a high-low pressure alarm system, an automatic alarm and interlocking protection system; the furnace temperature or pressure and working conditions are automatically and intelligently controlled on site and remotely controlled by DCS; and an ultra-low NOx, CO emission, multi-stage multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas burner is realized.

[0100] In the embodiment, the process of combustion air is as follows:

[0101] The combustion air is high-pressure high-speed combustion air generated by a high-pressure high-speed combustion air fan, is guided to the combustion air adjusting valve through the air duct, and is then introduced into the burner barrel 5; the high-pressure high-speed combustion air is divided into two parts in the burner barrel 5; one part of the high-pressure high-speed combustion air enters the air automatic rotating assembly 1, the high-pressure high-speed combustion air drives N folding blades to rotate at high speed, and the high-speed rotating folding blades change the straight-flow combustion air into vortex rotating air (the direction of the vortex rotating air is opposite to the direction of the yellow phosphorus tail gas rotating air). Meanwhile, the other part of the high-pressure high-speed combustion air enters the combustion air distribution plate 4 arranged at the front end of the burner barrel 5, and uniform straight-flow air is formed at the outlet of the front end of the burner, and the central vortex rotating air and the uniform straight-flow air around the central vortex rotating air form a tornado and are sprayed into the furnace.

[0102] In the embodiment, the process of the yellow phosphorus tail gas fuel gas is as follows:

[0103] The yellow phosphorus tail gas fuel gas is guided to the water seal, the expansion joint, the manual valve, the pressure gauge, the low-pressure switch, the quick cut-off valve, the leak detection switch, the diffuser valve, the quick cut-off valve, and is then divided into three paths:

[0104] The central path is guided to the manual valve, the electric regulating valve, the special central lance 6, the corrugated rotating sheet 29, and the Venturi tube, and high-speed yellow phosphorus tail gas is formed and sprayed into the furnace.

[0105] The left path (the right path is symmetrical to the left path) is guided to the manual valve, the electric regulating valve, the fuel chamber 8 (divided into left and right air inlet chambers), and the special lance 3 and the automatic rotating lance 2, and is then sprayed into the furnace chamber.

[0106] Combustion air and yellow phosphorus tail gas fuel gas are rotated and interlaced in the furnace cavity, fully mixed, and ignited by an automatic ignition gun to form a vortex rotating flame in the entire furnace, without high-temperature concentrated flame area, and the generation of NOx is reduced.

[0107] The air automatic rotating assembly 1 is composed of a high-temperature bearing 14, an outer cylinder 13, and a rotating folded blade 15. The automatic rotating spray gun 2 is composed of a rotating cylinder 18, a high-temperature eccentric bearing 19, a needle bearing 20, a fixed seat, a first gun pipe 16, a first spray gun expansion pipe 17, and a rotating blade 21. The special spray gun 3 pipe is composed of a special spray head 24, a second gun pipe 22, and a second spray gun expansion pipe 23. The central gun 6 is composed of a Venturi tube 26, a corrugated rotational flow sheet 29, an inner gun pipe 28, and an outer gun pipe 27. The steam automatic blowing gun is composed of a high-temperature spray gun 31, a fixed block 32, a graphite packing 33, a cover plate 34, a bolt and nut 35, a ball valve 36, and a quick connector 30.

[0108] Embodiment 3

[0109] The embodiment provides a multi-stage combustion method, which adopts the multi-layer dispersion combustion and the high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner in the embodiment 1, and the method comprises the following steps:

[0110] S1, the outlet of the burner is connected with a furnace chamber, and excess yellow phosphorus tail gas and appropriate air are sprayed into the front section (low gun pipe) of the furnace chamber, so that the yellow phosphorus tail gas is insufficiently combusted in excess air, the temperature of the combustion area of the furnace chamber is high, but the oxygen is seriously insufficient, and anaerobic combustion is formed; nitrogen in the air cannot react with oxygen, and NOx cannot be generated.

[0111] In the embodiment, the flame area temperature is reduced to form a low-temperature zone, and the generation amount of NOx in the low-temperature zone is very small.

[0112] S2, combustion-supporting air is supplemented to the furnace chamber through an air duct in the middle section or the rear section of the furnace chamber, to form oxygen-rich combustion, so that CO in the yellow phosphorus tail gas which is not completely combusted in the front section is combusted again with the supplemented combustion-supporting air.

[0113] In the embodiment, because the lengths of the spray gun pipes are different and the directions of the spray holes 25 are different, the shapes of the generated flames are in the form of wave rotating turbines, and the flames roll forward layer by layer from the outlet of the burner to the furnace chamber, without a central flame high-temperature zone, and the NOx is effectively reduced.

[0114] In the embodiment, fuel staging, air staging, and in-furnace flue gas internal circulation are simultaneously used as low-nitrogen combustion technologies, so that the flames fill the entire furnace chamber as much as possible, vortex rotating flames are formed in the entire furnace chamber, there is no central flame, the average temperature and the peak temperature of the flames are reduced, the FGR circulating flue gas system is simultaneously used, and the generation of NOx is reduced.

[0115] The above is only the preferred embodiment of the present application, and does not limit the technical scope of the present application. Any slight modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment still belongs to the technical scope of the present application.

Claims

1. A multi-layer dispersed combustion, high-efficiency and energy-saving yellow phosphorus tail gas low-NOx burner, wherein the mounting flange of the burner is connected to the furnace, characterized in that, The burner includes: The cylinder is divided into a relatively independent fuel chamber and a combustion chamber by a horizontal partition. The fuel chamber is used to transport yellow phosphorus exhaust gas, and the combustion chamber is used to transport high-pressure and high-speed combustion air. The fuel chamber is provided with a drain outlet, and the combustion chamber is provided with a flame detection component and a flame observation port. A center gun is located at the center of the cylinder. The inlet end of the center gun is connected to the fuel chamber. The outlet end of the center gun is equipped with a corrugated swirl vane for spraying out yellow phosphorus exhaust gas and changing the yellow phosphorus exhaust gas in the center from a direct current to a vortex flow. An automatic telescopic ignition gun assembly is inserted into the center gun. The spray gun has multiple layers of nozzles that are concentrically distributed outwards around the central gun. Some of the nozzles are staggered in height and have different orientations, while others are equipped with rotating blades. An automatic air rotation component is disposed on the outer periphery of the outlet end of the center gun and communicates with the combustion chamber for supplying combustion air. The automatic air rotation component is used to automatically rotate the combustion air at high speed so that the combustion air is fully mixed with the yellow phosphorus exhaust gas. The fuel chamber is divided into a central air intake chamber, a left air intake chamber, and a right air intake chamber by a partition. The air intake end of the central air intake chamber is connected to a central yellow phosphorus tail gas inlet, the air intake end of the left air intake chamber is connected to a left yellow phosphorus tail gas inlet, and the air intake end of the right air intake chamber is connected to a right yellow phosphorus tail gas inlet. Also includes: At least two layers of automatic rotating spray gun groups, and the multiple layers of automatic rotating spray gun groups are concentrically distributed outward on the outer periphery of the central gun. Each layer of automatic rotating spray gun group includes a number of automatic rotating spray guns arranged circumferentially. At least one layer of special spray gun group, the special spray gun group is concentrically distributed on the outer periphery of the central gun and located between two adjacent layers of automatic rotating spray gun group, each layer of the special spray gun group includes several special spray guns arranged circumferentially, and the multiple automatic rotating spray guns and the multiple special spray guns are staggered, the nozzles of the multiple special spray guns are staggered at different heights and the nozzle orientations are different.

2. The multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas low-NOx burner according to claim 1, characterized in that, The central gun also includes: The outer barrel has a first end connected to the central air intake chamber and a second end that is a venturi tube. An inner barrel is inserted into the inner cavity of the outer barrel, and one end of the automatic telescopic ignition gun assembly is inserted into the inner barrel. The corrugated swirl vane is disposed between the outer barrel and the inner barrel, and is located at one end near the venturi tube.

3. The multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas low-NOx burner according to claim 2, characterized in that, The cylinder is provided with a combustion-supporting air distribution plate, which forms a combustion-supporting cavity with the transverse partition. The center of the combustion-supporting air distribution plate is provided with a first through hole, and several second through holes are distributed in other positions.

4. The multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas low-NOx burner according to claim 3, characterized in that, The automatic air rotation assembly also includes: The outer cylinder is rotatably sleeved on the outside of the venturi tube, and the first end of the outer cylinder is connected to the first through hole; A rotating folding blade is disposed between the outer cylinder and the venturi tube, and is connected to the venturi tube by a high-temperature eccentric bearing.

5. The multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas low-NOx burner according to claim 4, characterized in that, The automatic rotating spray gun includes: The first gun barrel has a first spray gun expansion tube connected to its first end, and the large-diameter end of the first spray gun expansion tube is connected to the left air intake chamber or the right air intake chamber. A rotating cylinder is rotatably connected to the second end of the gun barrel, and a high-temperature eccentric bearing and a needle roller bearing are installed between the gun barrel and the rotating cylinder. The rotating blade is located at the end of the rotating cylinder away from the gun barrel, and the rotation direction of the rotating blade is opposite to the rotation direction of the rotating folding blade.

6. The multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas low-NOx burner according to claim 1, characterized in that, The special spray gun includes: The second gun barrel has a first end connected to a second spray gun expander, and the large-diameter end of the second spray gun expander is connected to the left air inlet or the right air inlet. A special nozzle, which is a 45° elbow and connected to the second end of the second gun barrel, is provided with nozzles of different angles and diameters.

7. The multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas low-NOx burner according to claim 1, characterized in that, The left air intake chamber is hinged to a left bottom cover, and the right air intake chamber is hinged to a right bottom cover. The left bottom cover is equipped with a left automatic steam purging gun assembly, and the right bottom cover is equipped with a right automatic steam purging gun assembly. The automatic steam purging guns in the left automatic steam purging gun assembly on the left bottom cover are correspondingly arranged with multiple first and second gun barrels connected to the left air intake chamber. The automatic steam purging guns in the right automatic steam purging gun assembly on the right bottom cover are correspondingly arranged with multiple first and second gun barrels connected to the right air intake chamber. The left and right automatic steam purging gun assemblies are respectively connected to high-temperature steam equipment.

8. A multi-stage combustion method, characterized in that, The method using the multi-layer dispersed combustion, high-efficiency energy-saving yellow phosphorus tail gas low-NOx burner according to any one of claims 1 to 7 includes: S1. The burner outlet is connected to the furnace. Excessive yellow phosphorus tail gas and appropriate amount of air are injected into the front section of the furnace, so that the yellow phosphorus tail gas burns in the case of excess air and insufficient air, thus forming anaerobic combustion. Nitrogen in the air cannot react with oxygen, NOx cannot be generated, and the temperature of the flame area is reduced, forming a low temperature zone. S2. In the middle or rear section of the furnace, combustion air is added to the furnace through the air duct to form oxygen-rich combustion, so that the CO in the yellow phosphorus tail gas that was not completely burned in the front section is completely burned again with the added combustion air.

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