Multilayer dispersed combustion, efficient energy-saving yellow phosphorus tail gas low-nitrogen combustor and multi-section combustion method

Abstract

The invention discloses a multi-layer dispersive combustion, efficient and energy-saving yellow phosphorus tail gas low-nitrogen combustor and a multi-section combustion method, and belongs to the technical field of energy conservation and environmental protection, a mounting flange of the combustor is connected with a hearth, the combustor comprises a barrel, the barrel 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 the yellow phosphorus tail gas; the combustion-supporting cavity is used for conveying high-pressure and high-speed combustion- The center gun is arranged in the center of the barrel, the inlet end of the center gun is communicated with the fuel cavity, nozzles of a part of the multiple layers of spray gun pipes are staggered in height, the directions of spray pipes are different, and a part of the spray gun pipes are provided with rotating blades. The air automatic rotating assembly is arranged on the periphery of the outlet end of the center gun and communicated with the combustion-supporting cavity, and the air automatic rotating assembly is used for enabling combustion-supporting air to automatically rotate at a high speed so that the combustion-supporting air can be fully mixed with yellow phosphorus tail gas. According to the invention, ultra-low NOx and CO emission of the yellow phosphorus burning tail gas is realized, and the problem of blockage of the yellow phosphorus burning tail gas is solved at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy conservation and environmental protection, and in particular relates to a multi-layer dispersed combustion, high-efficiency and energy-saving yellow phosphorus tail gas low-nitrogen burner and a multi-stage combustion method. Background Art

[0002] Yellow phosphorus is an extremely important strategic basic industrial raw material. my country is rich in phosphate rock resources and is the world's largest yellow phosphorus producer, accounting for more than 80% of global output. Yellow phosphorus can only be produced through thermal methods. Every ton of yellow phosphorus produces 3,000 standard cubic meters of yellow phosphorus exhaust gas, of which the CO content is as high as 85%. CO is an important raw material for carbon chemical industry and a typical greenhouse gas. However, due to the lack of purification and perfect combustion technology, yellow phosphorus exhaust gas containing high concentrations of CO has been emitted for a long time, causing serious waste of resources and severe air pollution. Summary of the Invention

[0003] In order to solve the above problems, the present invention adopts the following technical solutions:

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

[0005] The cylinder is divided into a relatively independent fuel chamber and a combustion-supporting chamber by a transverse partition. The fuel chamber is used to transport yellow phosphorus tail gas, and the combustion-supporting chamber is used to transport high-pressure and high-speed combustion-supporting air. The fuel chamber is provided with a sewage outlet, and the combustion-supporting chamber is provided with a fire detection component and a fire viewing port;

[0006] A central gun is provided at the center of the barrel, the inlet end of the central gun is connected to the fuel chamber, and the outlet end of the central gun is provided with a corrugated swirl sheet for spraying yellow phosphorus tail gas and converting the central yellow phosphorus tail gas from direct current wind to vortex swirl wind. An automatic telescopic ignition gun assembly is inserted into the central gun;

[0007] Multiple layers of spray gun tubes, the multiple layers of spray gun tubes are sequentially and concentrically distributed outwardly around the periphery of the central gun, some of the spray gun tubes have nozzles of different heights and orientations, and other parts of the spray gun tubes are provided with rotating blades;

[0008] An automatic air rotation component is arranged on the periphery of the outlet end of the central gun and is connected to the combustion-supporting chamber for conveying combustion-supporting air. The automatic air rotation component is used to automatically rotate the combustion-supporting air at a high speed so that the combustion-supporting air and the yellow phosphorus tail gas are fully mixed.

[0009] Furthermore, the fuel chamber is divided into a central air inlet chamber, a left air inlet chamber and a right air inlet chamber which are independent of each other through a middle partition. The air inlet end of the central air inlet chamber is connected to a central yellow phosphorus tail gas feed port, the air inlet end of the left air inlet chamber is connected to a left yellow phosphorus tail gas feed port, and the air inlet end of the right air inlet chamber is connected to a right yellow phosphorus tail gas feed port.

[0010] Furthermore, the central gun further comprises:

[0011] an outer barrel, wherein a first end of the outer barrel is in communication with the central air inlet cavity, and a second end of the outer barrel is a venturi tube;

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

[0013] Wherein, the corrugated swirl sheet is arranged between the outer barrel and the inner barrel, and is located near one end of the Venturi tube.

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

[0015] Furthermore, the automatic air rotation component further comprises:

[0016] an outer cylinder, the outer cylinder being rotatably sleeved on the outer side of the venturi tube, and the end portion of the first end of the outer cylinder being connected to the first through hole;

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

[0018] Furthermore, it also includes:

[0019] At least two layers of automatic rotary spray gun groups, wherein the multiple layers of automatic rotary spray gun groups are sequentially and concentrically distributed outwardly on the periphery of the central gun, and each layer of the automatic rotary spray gun group includes a plurality of automatic rotary spray guns arranged along the circumference;

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

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

[0022] a first gun barrel, wherein a first end of the first gun barrel is connected to a first spray gun expansion pipe, and a large-diameter end of the first spray gun expansion pipe is in communication 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 blade is arranged 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.

[0024] Furthermore, the special spray gun includes:

[0025] a second gun barrel, wherein a first end of the second gun barrel is connected to a second spray gun expansion pipe, and a large-diameter end of the second spray gun expansion pipe is in communication with the left air inlet cavity or the right air inlet cavity;

[0026] A special nozzle is a 45° elbow connected to the second end of the second gun barrel. The special nozzle is provided with nozzles of different angles and different apertures.

[0027] Furthermore, the left air inlet chamber is hingedly connected to a left bottom cover, and the right air inlet chamber is hingedly connected to a right bottom cover. The left bottom cover is provided with a left automatic steam purge gun group, and the right bottom cover is provided with a right automatic steam purge gun group. The automatic steam purge guns in the left automatic steam purge gun group located on the left bottom cover are corresponding to the multiple first gun barrels and second gun barrels connected to the left air inlet chamber, and the automatic steam purge guns in the right automatic steam purge gun group located on the right bottom cover are corresponding to the multiple first gun barrels and second gun barrels connected to the right air inlet chamber. The left automatic steam purge gun group and the right automatic steam purge gun group are respectively connected to high-temperature steam equipment.

[0028] A multi-stage combustion method, using any of the above-mentioned multi-layer dispersed combustion, high-efficiency and energy-saving yellow phosphorus tail gas low-nitrogen burners, the method comprising:

[0029] S1. The burner outlet is connected to the furnace. Excessive yellow phosphorus tail gas and an appropriate amount of air are injected into the front section of the furnace, so that the yellow phosphorus tail gas burns in the absence of excess air, forming anaerobic combustion. The nitrogen in the air cannot react with oxygen, and NOx cannot be generated, which reduces the temperature of the flame area and forms a low-temperature zone.

[0030] S2. Combustion-supporting air is added to the furnace through the air duct in the middle or rear section of the furnace to form oxygen-enriched combustion, so that the CO in the yellow phosphorus tail gas that was not completely burned in the front section can be completely burned again with the added combustion-supporting air.

[0031] Beneficial effects:

[0032] The invention solves the problem of ultra-low NOx and CO emissions from yellow phosphorus burning tail gas and simultaneously solves the problem of yellow phosphorus burning tail gas blockage.

[0033] The burner of the present invention adopts multi-stage and multi-layer dispersed combustion, the front stage adopts anaerobic combustion, the rear stage adopts oxygen-enriched combustion, and the fuel is sprayed to the periphery of the furnace for multi-stage and multi-layer dispersed combustion.

[0034] The combustion-supporting air in this invention utilizes an automatic swirl system and a uniform air distribution system. The yellow phosphorus tail gas nozzle is designed with an automatically rotating spray gun, a special multi-gun pipe, staggered nozzle heights, and nozzle orientations of varying sizes. Furthermore, low-nitrogen combustion technologies such as fuel staging and in-furnace flue gas recirculation are employed. This ensures that the flame fills the entire furnace chamber as much as possible, creating a swirling, rotating flame with no central flame, lowering both average and peak flame temperatures. Furthermore, a flue gas recirculation system (FGR) is employed to reduce NOx generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a schematic diagram of the left side view of the overall structure of the present invention;

[0037] Figure 3 It is a schematic diagram of the right side view of the overall structure of the present invention;

[0038] Figure 4 This is a schematic diagram of the internal structure of the automatic air rotation assembly of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of the rotating folding blade of the present invention;

[0040] Figure 6 This is a schematic diagram of a front view of the automatic rotating spray gun of the present invention;

[0041] Figure 7 A schematic top view of the automatic rotary spray gun of the present invention;

[0042] Figure 8 A schematic front view of the structure of the special spray gun of the present invention;

[0043] Figure 9 A schematic top view of the structure of the special spray gun of the present invention;

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

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

[0046] Figure 12 It is a structural schematic diagram of the steam purge gun of the present invention;

[0047] Figure 13The burner of the present invention is three-dimensional Figure 1 ;

[0048] Figure 14 The burner of the present invention is three-dimensional Figure 2 ;

[0049] Figure 15 This is a three-dimensional front view of the burner of the present invention;

[0050] Figure 16 This is a three-dimensional diagram of the half-open rear cover of the burner of the present invention.

[0051] Among them, 1. Air automatic rotation component; 2. Automatic rotating spray gun; 3. Special spray gun; 4. Combustion air distribution plate; 5. Cylinder; 6. Center gun; 7. Fire detection; 8. Fuel chamber; 9. Steam purge gun; 10. Automatic telescopic ignition gun; 11. Drain port; 12. Middle partition; 13. Outer cylinder; 14. High temperature bearing; 15. Rotating folding blade; 16. First gun barrel; 17. First spray gun expansion pipe; 18. Rotating cylinder; 1 9. High-temperature eccentric bearing; 20. Needle roller bearing; 21. Rotating blade; 22. Second gun barrel; 23. Second spray gun expansion tube; 24. Special nozzle; 25. Spray hole; 26. Venturi tube; 27. Outer gun barrel; 28. Inner gun barrel; 29. Corrugated swirl plate; 30. Quick connector; 31. High-temperature spray gun; 32. Fixing block; 33. Graphite packing; 34. Cover plate; 35. Bolts and nuts; 36. Ball valve; 37. Fire viewing port. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0054] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing 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. Therefore, they cannot be understood as limitations on the present invention.

[0055] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0056] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0057] Example 1

[0058] refer to Figures 1-16 , a multi-layer dispersed combustion, high-efficiency and energy-saving yellow phosphorus tail gas low-nitrogen burner, the burner's mounting flange is connected to the furnace, the burner includes:

[0059] The cylinder 5 is divided into a relatively independent fuel chamber 8 and a combustion chamber by a transverse partition. The fuel chamber 8 is used to transport yellow phosphorus tail gas, and the combustion chamber is used to transport high-pressure and high-speed combustion air. The fuel chamber 8 is provided with a sewage outlet 11, and the combustion chamber is provided with a double fire detection assembly 7 and a fire viewing 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 connected to the fuel chamber 8. The outlet end of the center gun 6 is provided with a corrugated swirl sheet 29 for converting the yellow phosphorus tail gas in the center from a direct current to a vortex swirl wind. The automatic telescopic ignition gun 10 assembly penetrates into the center gun 6.

[0061] Multi-layer spray gun tubes, the multi-layer spray gun tubes are sequentially and concentrically distributed outwardly on the periphery of the central gun 6, some of the spray gun tubes have nozzles of different heights and different nozzle orientations, and the other part is at least partially provided with rotating blades 21;

[0062] The air automatic rotating component 1 is arranged on the periphery of the outlet end of the central gun 6 and is connected to the combustion chamber. The air automatic rotating component 1 is provided with rotating folding blades 15, which are used to automatically rotate the combustion air at high speed to fully mix the combustion air with the yellow phosphorus tail gas.

[0063] During specific implementation, the sewage outlet 11 is connected to the overflow valve.

[0064] During specific implementation, the automatic air rotation component 1 can automatically rotate the swirl wind to drive the uniform direct current wind around the periphery to rotate together.

[0065] The invention utilizes yellow phosphorus tail gas as fuel and is applicable to heating furnace equipment such as balancing furnaces, hot blast furnaces, boilers, power generation, industrial kilns, and civil heating, conforming to top-burning and side-burning types, and having a blue-yellow circular vortex multi-layer flame.

[0066] Example 2

[0067] In order to improve practicality, this embodiment makes further arrangements based on the embodiment 1.

[0068] In this embodiment, the fuel chamber 8 is divided into a central air inlet chamber, a left air inlet chamber and a right air inlet chamber which are independent of each other by a middle partition 12. The air inlet end of the central air inlet chamber is connected to the central yellow phosphorus tail gas feed port, the air inlet end of the left air inlet chamber is connected to the left yellow phosphorus tail gas feed port, and the air inlet end of the right air inlet chamber is connected to the right yellow phosphorus tail gas feed port.

[0069] In this embodiment, the center gun 6 includes:

[0070] an outer barrel 27 , wherein a first end of the outer barrel 27 is connected to the central air inlet cavity, and a second end of the outer barrel 27 is a venturi tube 26 ;

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

[0072] The corrugated swirl sheet 29 is disposed between the outer barrel 27 and the inner barrel 28 and is located near one end of the venturi tube 26 .

[0073] In this embodiment, a combustion-supporting air distribution plate 4 is provided in the cylinder 5. The combustion-supporting air distribution plate 4 and the transverse partition form a combustion-supporting cavity. A first through hole is provided in the center of the combustion-supporting air distribution plate 4, and a plurality of second through holes are distributed in the remaining positions.

[0074] During specific implementation, the special central gun 6 is composed of a venturi tube 26 and a corrugated swirl sheet 29; the central direct wind is converted into vortex swirl wind, while the wind pressure and wind speed of the central vortex swirl wind are increased, driving the peripheral wind and yellow phosphorus tail gas to be disturbed, so that the air and yellow phosphorus tail gas are mixed more fully and dispersedly.

[0075] In this embodiment, the automatic air rotation component 1 further includes:

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

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

[0078] During specific implementation, high-speed, high-pressure central combustion-supporting air enters the outer cylinder 13, pushing the specially structured folding blades, causing them to automatically rotate at high speed under the influence of the high-pressure, high-speed air. Simultaneously, the air forms a powerful vortex wind within the high-speed rotating folding blades 15. This vortex wind in turn drives the peripheral direct current air to rotate, causing the entire combustion-supporting air to rotate in the opposite direction of the yellow phosphorus exhaust. This allows the yellow phosphorus exhaust and the combustion-supporting air to fully mix and burn, effectively reducing flame aggregation points and allowing the yellow phosphorus exhaust to burn more dispersedly, effectively reducing NOx generation points.

[0079] In this embodiment, it also includes:

[0080] At least two layers of automatic rotary spray gun groups, the multiple layers of automatic rotary spray gun groups are sequentially and concentrically distributed outwardly on the periphery of the central gun 6, and each layer of automatic rotary spray gun group includes a plurality of automatic rotary spray guns 2 arranged along the circumference;

[0081] At least one layer of special spray gun group is concentrically distributed on the periphery of the central gun 6 and is located between the two adjacent layers of automatic rotating spray gun groups. Each layer of special spray gun group includes several special spray guns 3 arranged along the circumferential direction, and multiple automatic rotating spray guns 2 and multiple special spray guns 3 are staggered. The nozzles of the several special spray guns 3 are staggered at different heights and the nozzle orientations are different.

[0082] During specific implementation, N special gun barrels are designed in the burner, and the N special gun barrels are divided into 3 to 8 groups. Some gun barrels have a 45-degree elbow welded at the front end of the nozzle, and holes of different angles and apertures are designed on the elbow; the height of each group of gun barrels is different, with a difference of about 90mm, and the gun barrels in each group are arranged in an interlaced manner.

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

[0084] a first gun barrel 16, wherein a first end of the first gun barrel 16 is connected to a first spray gun expansion tube 17, and a large diameter end of the first spray gun expansion tube 17 is in communication with the left air inlet cavity or the right air inlet cavity;

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

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

[0087] In specific implementation, high-speed, high-pressure yellow phosphorus tail gas enters the automatically rotatable spray gun, and the yellow phosphorus tail gas sprayed from the first gun barrel 16 drives the rotating blade 21 to rotate automatically; at the same time, the yellow phosphorus tail gas automatically rotates with the rotating blade 21.

[0088] In practice, the automatically rotatable spray gun comprises a rotating blade 21, a rotating cylinder 18, a needle bearing 20, a high-temperature bearing 14, a fixed base, a first gun barrel 16, and a first gun expansion tube 17. High-pressure yellow phosphorus exhaust gas flows from the fuel chamber 8 to the first gun expansion tube 17, then to the first gun barrel 16, and finally to the rotating blade 21. The high-pressure airflow propels the rotating blade 21, and the yellow phosphorus exhaust gas follows the vortex of the rotating blade, thus making the yellow phosphorus exhaust more dispersed and mixing more evenly with the air. This prevents the formation of a high-temperature flame zone and the generation of NOx.

[0089] During specific implementation, the yellow phosphorus tail gas that can automatically swirl drives the yellow phosphorus tail gas dispersed around to rotate together; the rotation direction of the yellow phosphorus tail gas is opposite to the rotation direction of the combustion-supporting air, so that the yellow phosphorus tail gas and the combustion-supporting air are fully mixed and burned; the flame gathering point is better reduced, the yellow phosphorus tail gas is burned more dispersedly, and the NOx generation point is effectively reduced.

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

[0091] A second gun barrel 22, wherein a first end of the second gun barrel 22 is connected to a second spray gun expansion tube 23, and a large diameter end of the second spray gun expansion tube 23 is in communication with the left air inlet cavity or the right air inlet cavity;

[0092] The special nozzle 24 is a 45° elbow and is connected to the second end of the second barrel 22. The special nozzle 24 is provided with nozzles 25 of different angles and different apertures.

[0093] In practice, since yellow phosphorus tail gas is generally not purified, it is easy to cause nozzle blockage; therefore, the burner is designed with an automatic steam purge component, automatic sewage and water purification treatment mechanism;

[0094] In this embodiment, the left air inlet chamber is hingedly connected to the left bottom cover, and the right air inlet chamber is hingedly connected to the right bottom cover. The left bottom cover is provided with a left automatic steam purge gun group, and the right bottom cover is provided with a right automatic steam purge gun group. The automatic steam purge gun 9 in the left automatic steam purge gun group on the left bottom cover is corresponding to the multiple first gun barrels 16 and second gun barrels 22 connected to the left air inlet chamber, and the automatic steam purge gun 9 in the right automatic steam purge gun group on the right bottom cover is corresponding to the multiple first gun barrels 16 and second gun barrels 22 connected to the right air inlet chamber. The left automatic steam purge gun group and the right automatic steam purge gun group are respectively connected to high-temperature steam equipment.

[0095] In a specific implementation, the fuel chamber 8 is divided into a central air inlet chamber, a left air inlet chamber, and a right air inlet chamber, which are independent of each other, by a middle partition plate 12. The left air inlet chamber and the right air inlet chamber are symmetrically arranged. The air inlet end of the central air inlet chamber is connected to the central yellow phosphorus tail gas feed port, the air inlet end of the left air inlet chamber is connected to the left yellow phosphorus tail gas feed port, and the air inlet end of the right air inlet chamber is connected to the right yellow phosphorus tail gas feed port. The central yellow phosphorus tail gas feed port can ensure stable flame combustion;

[0096] When cleaning the nozzle after running a cycle, do not stop the furnace. Automatically close the quick shut-off valve on one side to ensure that the center fire and the other side fire continue to burn stably; then open the corresponding automatic high-temperature steam purge system to purge the fuel chamber 8 and the barrel.

[0097] During specific implementation, an independent automatic purge system is designed, and each gun barrel is equipped with a corresponding purge gun; 2 to N purge guns form a group, and each group is quickly connected to the high-temperature steam.

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

[0099] During specific implementation, the present invention simultaneously designs a dual fire detection system 7, a temperature control system, an automatic ignition system, an automatic purge system, an automatic leak detection system, a fuel pressure stabilization system, a high and low pressure alarm system, an automatic alarm and interlocking protection system; performs on-site automatic intelligent control and DCS remote control according to the furnace temperature or pressure and working conditions; and realizes an ultra-low NOx, CO emission, multi-stage and multi-layer dispersed combustion, and high-efficiency and energy-saving yellow phosphorus tail gas burner.

[0100] In this embodiment, the process direction of combustion air is:

[0101] The combustion air is generated by the high-pressure, high-speed combustion air blower → air duct → combustion air regulating valve → burner barrel 5, and is further divided into two parts at the burner barrel 5; one part of the high-pressure, high-speed combustion air enters the air automatic rotation component 1, which drives N folded blades to rotate at high speed. The high-speed rotating folded blades turn the DC combustion air into eddy swirl wind (the direction of this swirl wind is opposite to the swirl direction of the yellow phosphorus tail gas). At the same time, the other part of the high-pressure, high-speed combustion air enters the combustion air distribution plate 4 set at the front end of the burner barrel 5, forming a uniform DC wind at the front end outlet of the burner. The central eddy swirl wind drives the uniform DC wind around to form a tornado and spray into the furnace.

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

[0103] Yellow phosphorus tail gas fuel gas → water seal → expansion joint → manual valve → pressure gauge → low pressure switch → quick shut-off valve → leak detection switch → relief valve → quick shut-off valve → further divided into three routes:

[0104] Center line → manual valve → electric regulating valve → special center gun 6 → corrugated swirl plate 29 → Venturi tube forms high-speed yellow phosphorus tail gas to be sprayed into the furnace.

[0105] Left route (the right route is symmetrical to the left route) → manual valve → electric regulating valve → fuel chamber 8 (divided into left and right air inlet chambers) → special spray gun 3 and automatic rotating spray gun 2 and then spray into the furnace chamber.

[0106] The combustion-supporting air and yellow phosphorus tail gas fuel gas rotate and intertwine with each other in the furnace chamber, are fully mixed together, and are then ignited by an automatic ignition gun to form a vortex rotating flame in the entire furnace, without a high-temperature concentrated flame area, thereby reducing the NOx generation point.

[0107] The automatic air rotation assembly 1 consists of a high-temperature bearing 14, an outer cylinder 13, and rotating folding blades 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 base, a first gun barrel 16, a first gun expansion pipe 17, and rotating blades 21. The special spray gun 3 is composed of a special nozzle 24, a second gun barrel 22, and a second gun expansion pipe 23. The center gun 6 is composed of a venturi tube 26, a corrugated swirl plate 29, an inner gun barrel 28, and an outer gun barrel 27. The automatic steam purge gun is composed of a high-temperature spray gun 31, a fixed block 32, graphite packing 33, a cover plate 34, bolts and nuts 35, a ball valve 36, and a quick connector 30.

[0108] Example 3

[0109] This embodiment provides a multi-stage combustion method, using the multi-layer dispersed combustion and high-efficiency energy-saving yellow phosphorus tail gas low-nitrogen burner in Example 1, the method comprising:

[0110] S1. The burner outlet is connected to the furnace. Excessive yellow phosphorus tail gas and an appropriate amount of air are sprayed into the front section of the furnace (lower barrel), so that the yellow phosphorus tail gas burns in the absence of excess air. Although the temperature in this furnace combustion area is high, there is a serious lack of oxygen, resulting in anaerobic combustion. The nitrogen in the air cannot react with oxygen, and NOx cannot be generated.

[0111] In this embodiment, the temperature of the flame region is lowered to form a low-temperature zone, where the amount of NOx generated is very small;

[0112] S2. In the middle or rear section of the furnace, combustion-supporting air is added to the furnace through the air duct to form oxygen-enriched 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-supporting air;

[0113] In this embodiment, since the lengths of the spray gun tubes are different and the orientations of the spray holes 25 are different, the flame generated is shaped like a wave-rotating turbine, rolling forward layer by layer from the burner outlet to the furnace, without a central flame high-temperature zone, effectively reducing NOx.

[0114] In this embodiment, low-nitrogen combustion technologies such as fuel staging, air staging, and flue gas internal circulation are simultaneously used to make the flame fill the entire furnace as much as possible, forming a vortex rotating flame in the entire furnace without a central flame, reducing the average and peak flame temperatures. At the same time, an FGR circulating flue gas system is used to reduce the generation of NOx.

[0115] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner, wherein the mounting flange of the burner is connected to the furnace, characterized in that: The burner comprises: The cylinder is divided into a relatively independent fuel chamber and a combustion-supporting chamber by a transverse partition. The fuel chamber is used to transport yellow phosphorus tail gas, and the combustion-supporting chamber is used to transport high-pressure and high-speed combustion-supporting air. The fuel chamber is provided with a sewage outlet, and the combustion-supporting chamber is provided with a fire detection component and a fire viewing port; A central gun is provided at the center of the barrel, the inlet end of the central gun is connected to the fuel chamber, and the outlet end of the central gun is provided with a corrugated swirl sheet for spraying yellow phosphorus tail gas and converting the central yellow phosphorus tail gas from direct current wind to vortex swirl wind. An automatic telescopic ignition gun assembly is inserted into the central gun; Multiple layers of spray gun tubes, the multiple layers of spray gun tubes are sequentially and concentrically distributed outwardly around the periphery of the central gun, some of the spray gun tubes have nozzles of different heights and orientations, and other parts of the spray gun tubes are provided with rotating blades; An automatic air rotation component is arranged on the periphery of the outlet end of the central gun and is connected to the combustion-supporting chamber for conveying combustion-supporting air. The automatic air rotation component is used to automatically rotate the combustion-supporting air at a high speed so that the combustion-supporting air and the yellow phosphorus tail gas are fully mixed.

2. The multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner according to claim 1 is characterized in that, The fuel chamber is divided into a central air inlet chamber, a left air inlet chamber and a right air inlet chamber which are independent of each other through a middle partition. The air inlet end of the central air inlet chamber is connected to a central yellow phosphorus tail gas feed port, the air inlet end of the left air inlet chamber is connected to a left yellow phosphorus tail gas feed port, and the air inlet end of the right air inlet chamber is connected to a right yellow phosphorus tail gas feed port.

3. The multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner according to claim 2 is characterized in that, The center gun also includes: an outer barrel, wherein a first end of the outer barrel is in communication with the central air inlet cavity, and a second end of the outer barrel is a venturi tube; an inner barrel, the inner barrel penetrating into the inner cavity of the outer barrel, and one end of the automatic telescopic ignition gun assembly penetrating into the inner barrel; Wherein, the corrugated swirl sheet is arranged between the outer barrel and the inner barrel, and is located near one end of the Venturi tube.

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

5. The multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner according to claim 4 is characterized in that, The automatic air rotation component also includes: an outer cylinder, the outer cylinder being rotatably sleeved on the outer side of the venturi tube, and the end portion of the first end of the outer cylinder being connected to the first through hole; The rotating folding blade is arranged between the outer cylinder and the venturi tube and is connected to the venturi tube through a high-temperature eccentric bearing.

6. The multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner according to claim 2 is characterized in that, Also includes: At least two layers of automatic rotary spray gun groups, wherein the multiple layers of automatic rotary spray gun groups are sequentially and concentrically distributed outwardly on the periphery of the central gun, and each layer of the automatic rotary spray gun group includes a plurality of automatic rotary spray guns arranged along the circumference; At least one layer of special spray gun group, the special spray gun group is concentrically distributed on the periphery of the central gun and is located between two adjacent layers of automatic rotating spray gun groups, each layer of the special spray gun group includes a plurality of special spray guns arranged along the circumferential direction, and a plurality of the automatic rotating spray guns and a plurality of the special spray guns are staggered, and the nozzles of the plurality of special spray guns are staggered in height and the nozzle orientations are different.

7. The multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner according to claim 6 is characterized in that, The automatic rotary spray gun comprises: a first gun barrel, wherein a first end of the first gun barrel is connected to a first spray gun expansion pipe, and a large-diameter end of the first spray gun expansion pipe is in communication with the left air inlet cavity or the right air inlet cavity; 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 blade is arranged 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.

8. The multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner according to claim 6 is characterized in that: The special spray gun includes: a second gun barrel, wherein a first end of the second gun barrel is connected to a second spray gun expansion pipe, and a large-diameter end of the second spray gun expansion pipe is in communication with the left air inlet cavity or the right air inlet cavity; A special nozzle is a 45° elbow connected to the second end of the second gun barrel. The special nozzle is provided with nozzles of different angles and different apertures.

9. The multi-layer dispersed combustion, high efficiency and energy saving yellow phosphorus tail gas low nitrogen burner according to claim 2 is characterized in that, 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 purge gun group, and the right bottom cover is provided with a right automatic steam purge gun group. The automatic steam purge guns in the left automatic steam purge gun group on the left bottom cover are corresponding to the multiple first gun barrels and second gun barrels connected to the left air inlet chamber, and the automatic steam purge guns in the right automatic steam purge gun group on the right bottom cover are corresponding to the multiple first gun barrels and second gun barrels connected to the right air inlet chamber. The left automatic steam purge gun group and the right automatic steam purge gun group are respectively connected to high-temperature steam equipment.

10. A multi-stage combustion method, characterized in that: Using the multi-layer dispersed combustion, high-efficiency and energy-saving yellow phosphorus tail gas low-nitrogen burner according to any one of claims 1 to 9, the method comprises: S1. The burner outlet is connected to the furnace. Excessive yellow phosphorus tail gas and an appropriate amount of air are injected into the front section of the furnace, so that the yellow phosphorus tail gas burns in the absence of excess air, forming anaerobic combustion. The nitrogen in the air cannot react with oxygen, and NOx cannot be generated, which reduces the temperature of the flame area and forms a low-temperature zone. S2. Combustion-supporting air is added to the furnace through the air duct in the middle or rear section of the furnace to form oxygen-enriched combustion, so that the CO in the yellow phosphorus tail gas that was not completely burned in the front section can be completely burned again with the added combustion-supporting air.

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