A swirl burner for preventing coking

Abstract

The present invention relates to a swirl burner for preventing coking, which comprises an air box body, a burner body and a secondary air box. The burner body is arranged inside the air box body, a central air duct is arranged inside the burner body, a central fan is arranged below the right side of the central air duct, a drum-shaped body is arranged on the left side of the central fan, a primary air duct is arranged below the drum-shaped body, a PA / PF pipe is arranged on the left side of the drum-shaped body, a collector casting is arranged at the left end of the PA / PF pipe, a secondary air duct is arranged outside the PA / PF pipe, a secondary air baffle is arranged inside the secondary air duct, a plurality of secondary air inner baffles are evenly arranged on the inner circumference of the secondary air baffle, a tertiary air duct is arranged outside the secondary air duct, a stable combustion component is arranged outside the tertiary air duct, and an installation disc is arranged outside the stable combustion component; The present invention has the advantages of simple structure, enhanced adaptability of the boiler to coal types, never coking around the nozzle, no falling coke in the cold ash hopper, and no need for manual coke poking.

Description

Technical Field

[0001] The present invention belongs to the technical field of burners, and particularly relates to a swirl burner for preventing coking. Background Art

[0002] Boiler coking has always been the main factor troubling the safe and stable operation of boilers. The main reasons are as follows: First, there is a certain amount of molten fly ash in the furnace; second, the temperature of individual areas on the furnace surface is high, and the fly ash cannot be cooled in time; third, the ignition point at the burner outlet is unstable, and the combustion area is alternately strong and weak, resulting in strong thermal gas disturbance, causing the fly ash to hit the furnace wall frequently, creating conditions for the adhesion of molten fly ash. To completely solve the coking problem,

[0003] The current treatment methods are as follows: First, increasing the primary air and pulverized coal flow rate at the burner nozzle does not relieve the coking phenomenon at the nozzle, and there is even a tendency to worsen; second, reducing the swirl intensity of the secondary air and increasing the secondary air volume improves the coking phenomenon to some extent, but the effect is not obvious. At high loads, the phenomenon of large chunks falling still occurs frequently; third, reducing the primary air velocity significantly improves the coking at the nozzle, but the coking problem has not been solved under high load conditions, and it can only relieve the coking problem of the boiler under low load conditions. In addition, due to the variety of coal types fed into the furnace and the inability to determine a single type, the combustion conditions of the boiler are complex and diverse, and the operating personnel cannot perform standardized combustion adjustment, resulting in frequent coking of the boiler and frequent falling of large coke chunks, which has an adverse impact on the safe operation of the boiler. At the same time, it increases the labor intensity of manual coke poking and unsafe factors, and has a great impact on the economy and stability of boiler operation. Therefore, it is very necessary to provide a swirl burner for preventing coking with a simple structure, enhanced adaptability to coal types of the boiler, never coking around the nozzle, no coke falling in the cold ash hopper, and no need for manual coke poking. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a swirl burner with a simple structure, enhanced adaptability to coal types of the boiler, never coking around the nozzle, no coke falling in the cold ash hopper, and no need for manual coke poking.

[0005] The object of the present invention is achieved as follows: A swirl burner for preventing coking, which comprises an air box body, a burner body and a secondary air box. The burner body is arranged inside the air box body. A central air duct is arranged inside the burner body. A central air blower is arranged below the right side of the central air duct. A drum-shaped body is arranged on the left side of the central air blower. A primary air duct is arranged below the drum-shaped body. A PA / PF pipe is arranged on the left side of the drum-shaped body. A collector casting is arranged at the left end of the PA / PF pipe. A secondary air duct is arranged outside the PA / PF pipe. A secondary air baffle is arranged inside the secondary air duct. A plurality of secondary air inner baffles are evenly arranged on the inner circumference of the secondary air baffle. A tertiary air duct is arranged outside the secondary air duct. A flame stabilizer assembly is arranged outside the tertiary air duct. A plurality of annular edge holes are evenly arranged on the circumference in front of the flame stabilizer assembly. An installation disc is arranged outside the flame stabilizer assembly. A plurality of installation bolts are evenly arranged on the circumference in front of the installation disc; A cold primary air pipe is arranged inside the secondary air box. A plurality of tertiary air discs are evenly arranged below the cold primary air pipe from left to right. Flow guide discs are arranged on both the upper and lower sides of the right end of the secondary air box.

[0006] A central air passage is arranged inside the central air duct. A toothed flow deflector is arranged outside the central air duct. A plurality of inner connecting rods for connecting the toothed flow deflector are evenly arranged on the outer circumference of the central air duct. A primary air passage is arranged between the toothed flow deflector and the secondary air inner baffle.

[0007] A plurality of outer connecting rods for connecting the secondary air inner baffle are evenly arranged on the outer side of the toothed flow deflector. The toothed flow deflector is composed of a plurality of spoiler vanes in an arc structure.

[0008] Spoiler teeth are symmetrically arranged on the left and right sides of the outer side of the spoiler vane. Grooves are arranged inside the spoiler teeth.

[0009] A secondary air swirl generator is arranged on the left side inside the secondary air duct. A secondary air passage for flowing secondary air is arranged inside the secondary air duct; A tertiary air swirl generator is arranged on the right side inside the tertiary air duct. A tertiary air passage for flowing tertiary air is arranged inside the tertiary air duct.

[0010] The flow guide disc is installed in an extended manner at the outer wall expansion cone of the secondary air passage at the burner nozzle by means of welding fixation.

[0011] Sixteen installation bolts are evenly arranged on the circumference in front of the installation disc. Sixteen annular edge holes are evenly arranged on the circumference in front of the flame stabilizer assembly. Eight secondary air inner baffles are evenly arranged on the inner circumference of the secondary air baffle. Three inner connecting rods are evenly arranged on the outer circumference of the central air duct. Four outer connecting rods are evenly arranged on the outer side of the toothed flow deflector.

[0012] Eight spoiler plates are evenly arranged on the outer circumference of the toothed spoiler.

[0013] Advantages of the present invention: The present invention is a swirl burner for preventing coking. By improving the tertiary air passage and the burner body nozzle, during use, the cold primary air pipe introduced inside the secondary air box is connected to the tertiary air disc, making the tertiary air source become the primary air source, increasing the tertiary air pressure, thus effectively improving the dynamic performance of the tertiary air, preventing coking at the outlet, and ensuring the smoothness of the passage. A guiding disc is welded to the extension of the outer wall of the secondary air passage at the burner body nozzle as the guiding direction of the tertiary air, ensuring the cleanliness within a certain range around the burner body and preventing coking on the heating surface. The present invention has the following advantages: First, the boiler's adaptability to coal types is enhanced, and any coal type with an ash melting point not lower than 1200 °C can be burned in the furnace. Second, the effect of preventing coking is obvious, and coking can be completely avoided around the burner nozzle. Third, large coke lumps no longer fall into the cold ash hopper, reducing the output of the dry slag extractor and the temperature of the slag extractor box. Fourth, there is no need for manual coke removal, greatly reducing the air leakage rate at the furnace bottom of the boiler, indirectly reducing the boiler's flue gas temperature, and improving the boiler efficiency. The present invention has the advantages of simple structure, enhanced boiler adaptability to coal types, no coking around the nozzle, no coke falling in the cold ash hopper, and no need for manual coke removal. Description of the Drawings

[0014] Figure 1 It is the front view of a swirl burner for preventing coking according to the present invention.

[0015] Figure 2 It is the side view of a swirl burner for preventing coking according to the present invention.

[0016] Figure 3 is Figure 2 partial structural schematic diagram.

[0017] Figure 4 is Figure 3 partial structural schematic diagram.

[0018] Figure 5 It is the structural schematic diagram of the interior of the secondary air box of a swirl burner for preventing coking according to the present invention after transformation.

[0019] Figure 6 It is the schematic diagram of the installation position of the guiding disc of a swirl burner for preventing coking according to the present invention.

[0020] In the figure: 1. Air box body; 2. Burner body; 3. Central air duct; 31. Central air passage; 32. Inner connecting rod; 4. Central fan; 5. Drum-shaped body; 6. Primary air duct; 7. PA / PF pipe; 71. Collector casting; 8. Secondary air duct; 81. Secondary air; 82. Secondary air swirl generator; 83. Secondary air passage; 9. Tertiary air duct; 91. Tertiary air; 92. Tertiary air swirl generator; 93. Tertiary air passage; 10. Mounting plate; 101. Mounting bolt; 11. Stable combustion component; 111. Annular edge hole; 12. Secondary air baffle; 13. Inner secondary air baffle; 14. Tooth-shaped flow spoiler; 141. Flow spoiler (for easy replacement and maintenance); 1411. Groove; 1412. Flow spoiler tooth; 15. Outer connecting rod; 16. Primary air passage; 17. Secondary air box; 18. Cold primary air pipeline; 19. Tertiary air disc; 20. Deflector disc. Detailed implementation mode

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Embodiment 1

[0023] As Figures 1-6 shown, a swirl burner for preventing coking includes an air box body 1, a burner body 2 and a secondary air box 17. The air box body 1 is internally provided with the burner body 2. The burner body 2 is internally provided with a central air duct 3. A central fan 4 is arranged below the right side of the central air duct 3. A drum-shaped body 5 is arranged on the left side of the central fan 4. A primary air duct 6 is arranged below the drum-shaped body 5. A PA / PF pipe 7 is arranged on the left side of the drum-shaped body 5. A collector casting 71 is arranged at the left end of the PA / PF pipe 7. A secondary air duct 8 is arranged outside the PA / PF pipe 7. A secondary air baffle 12 is arranged inside the secondary air duct 8. A plurality of inner secondary air baffles 13 are evenly arranged on the inner circumference of the secondary air baffle 12. A tertiary air duct 9 is arranged outside the secondary air duct 8. A stable combustion component 11 is arranged outside the tertiary air duct 9. A plurality of annular edge holes 111 are evenly arranged on the front circumference of the stable combustion component 11. A mounting plate 10 is arranged outside the stable combustion component 11. A plurality of mounting bolts 101 are evenly arranged on the front circumference of the mounting plate 10. A cold primary air pipeline 18 is arranged inside the secondary air box 17. A plurality of tertiary air discs 19 are evenly arranged below the cold primary air pipeline 18 from left to right. Deflector discs 20 are arranged on both the upper and lower sides of the right end of the secondary air box 17.

[0024] A central air duct 3 is provided with a central air passage 31 inside, and a toothed spoiler 14 is arranged outside the central air duct 3. A plurality of inner connecting rods 32 for connecting the toothed spoiler 14 are evenly arranged on the outer circumference of the central air duct 3. A primary air passage 16 is arranged between the toothed spoiler 14 and the secondary air inner baffle 13.

[0025] A plurality of outer connecting rods 15 for connecting the secondary air inner baffle 13 are evenly arranged on the outer side of the toothed spoiler 14. The toothed spoiler 14 is composed of a plurality of spoiler vanes 141 with arc-shaped structures.

[0026] Spoiler teeth 1412 are symmetrically arranged on the left and right sides of the outer side of the spoiler vane 141, and grooves 1411 are arranged inside the spoiler teeth 1412.

[0027] A secondary air swirl generator 82 is arranged on the left side inside the secondary air duct 8, and a secondary air passage 83 for flowing secondary air 81 is arranged inside the secondary air duct 8; a tertiary air swirl generator 92 is arranged on the right side inside the tertiary air duct 9, and a tertiary air passage 93 for flowing tertiary air 91 is arranged inside the tertiary air duct 9.

[0028] The present invention is a swirl burner for preventing coking. The present invention improves the tertiary air channel 93 and the nozzle of the burner body 1. During use, since the tertiary air channel 93 is arranged at the outermost end of all air distribution channels and the inlet area of ​​the channel is narrow, the flow rate is relatively small compared to the secondary air 81. Therefore, the cold primary air duct 18 introduced into the secondary air box 17 is connected to the tertiary air disc 19, so that the tertiary air source is converted into the primary air source, so that the pressure of the tertiary air 91 is increased, thereby effectively improving the dynamics of the tertiary air 91. When encountering melted fly ash accumulation at the nozzle cross section, the coke body can be blown away due to sufficient power, resulting in no more coking at the outlet, thereby ensuring smooth passage. In addition, according to the cause of coking in the peripheral area of ​​the burner body 1 nozzle, the burner body 1 nozzle is improved without changing the overall working principle of the burner body 1. The secondary air channel 81 is opened at the nozzle of the burner body 1. 3. A guide disc 20 is welded on the outer wall expansion cone to guide the tertiary air 91. When the cold tertiary air passes through the nozzle, the guide disc 20 guides the tertiary air 91 to blow back and sweep around the water-cooled wall heating surface, so that the cold tertiary air sweeps the water-cooled wall heating surface outside the nozzle of the burner body 1. When the melted fly ash in the furnace hits the water-cooled wall heating surface, it encounters the wind resistance of the cold tertiary air, so that the melted fly ash cannot contact the water-cooled wall heating surface. Even if some fly ash contacts the water-cooled wall heating surface, it will be cooled in time under the action of the relatively strong cold tertiary air, and can be blown away, so that the melted fly ash cannot adhere to the heating surface, and finally ensure that the burner body 1 is clean within a certain range around it, and no coking of the heating surface occurs. The present invention has the advantages of simple structure, enhanced coal adaptability of the boiler, no coking around the nozzle, no coking in the cold ash hopper, and no need for manual coking.

[0029] Example 2

[0030] like Figures 1-6As shown in the figure, a cyclone burner for preventing coking includes an air box body 1, a burner body 2, and a secondary air box 17. The burner body 2 is arranged inside the air box body 1. A central air duct 3 is arranged inside the burner body 2. A central air blower 4 is arranged below the right side of the central air duct 3. A drum-shaped body 5 is arranged on the left side of the central air blower 4. A primary air duct 6 is arranged below the drum-shaped body 5. A PA / PF pipe 7 is arranged on the left side of the drum-shaped body 5. A collector casting 71 is arranged at the left end of the PA / PF pipe 7. A secondary air duct 8 is arranged outside the PA / PF pipe 7. A secondary air baffle 12 is arranged inside the secondary air duct 8. A plurality of secondary air inner baffles 13 are evenly arranged on the inner circumference of the secondary air baffle 12. A tertiary air duct 9 is arranged outside the secondary air duct 8. A flame stabilization component 11 is arranged outside the tertiary air duct 9. A plurality of annular holes 111 are evenly arranged on the circumference in front of the flame stabilization component 11. An installation disc 10 is arranged outside the flame stabilization component 11. A plurality of installation bolts 101 are evenly arranged on the circumference in front of the installation disc 10. A cold primary air duct 18 is arranged inside the secondary air box 17. A plurality of tertiary air discs 19 are evenly arranged from left to right below the cold primary air duct 18. Flow guide discs 20 are arranged on both the upper and lower sides of the right end of the secondary air box 17.

[0031] A central air passage 31 is arranged inside the central air duct 3. A toothed flow deflector 14 is arranged outside the central air duct 3. A plurality of inner connecting rods 32 for connecting the toothed flow deflector 14 are evenly arranged on the outer circumference of the central air duct 3. A primary air passage 16 is arranged between the toothed flow deflector 14 and the secondary air inner baffle 13.

[0032] A plurality of outer connecting rods 15 for connecting the secondary air inner baffle 13 are evenly arranged on the outer side of the toothed flow deflector 14. The toothed flow deflector 14 is composed of a plurality of spoiler vanes 141 with an arc-shaped structure.

[0033] Spoiler teeth 1412 are symmetrically arranged on the left and right sides of the outer side of the spoiler vane 141. A groove 1411 is arranged inside the spoiler teeth 1412.

[0034] A secondary air swirl generator 82 is arranged on the left side inside the secondary air duct 8. A secondary air passage 83 for flowing secondary air 81 is arranged inside the secondary air duct 8. A tertiary air swirl generator 92 is arranged on the right side inside the tertiary air duct 9. A tertiary air passage 93 for flowing tertiary air 91 is arranged inside the tertiary air duct 9.

[0035] For better effect, the flow guide disc 20 is installed in an extended manner at the conical expansion part of the outer wall of the secondary air passage 83 at the burner nozzle by welding.

[0036] For better effect, sixteen mounting bolts 101 are evenly arranged in the circumferential direction in front of the mounting disc 10, sixteen annular edge holes 111 are evenly arranged in the circumferential direction in front of the stable combustion component 11, eight secondary air inner baffles 13 are evenly arranged in the circumferential direction inside the secondary air baffle 12, three inner connecting rods 32 are evenly arranged in the circumferential direction outside the central air duct 3, and four outer connecting rods 15 are evenly arranged outside the toothed flow deflector 14.

[0037] For better effect, eight spoiler vanes 141 are evenly arranged on the outer circumference of the toothed flow deflector 14.

[0038] The present invention is a swirl burner for preventing coking. The present invention improves the tertiary air passage 93 and the nozzle of the burner body 1. During use, since the tertiary air passage 93 is arranged at the outermost end of all air distribution passages and the passage inlet area is relatively narrow, the flow rate is relatively smaller than that of the secondary air 81. Therefore, the cold primary air duct 18 introduced inside the secondary air box 17 is connected to the tertiary air disc 19, so that the tertiary air source becomes the primary air source, and the pressure of the tertiary air 91 is increased, thereby effectively improving the dynamic performance of the tertiary air 91. When encountering the accumulation of melted fly ash at the nozzle cross-section, due to sufficient power, the coke body can be blown away, resulting in no coking at the outlet and ensuring the smoothness of the passage; in addition, according to the reasons for coking in the peripheral area of the nozzle of the burner body 1, without changing the overall working principle of the burner body 1, the nozzle of the burner body 1 is improved. A diversion disc 20 is welded by extension at the outer wall expansion cone of the secondary air passage 83 at the nozzle of the burner body 1 as the diversion direction of the tertiary air 91. When the cold tertiary air passes through the nozzle, it is diverted by the diversion disc 20, so that the tertiary air 91 blows back and sweeps around through the water-cooled wall heating surface. Thus, the cold tertiary air sweeps the water-cooled wall heating surface outside the nozzle of the burner body 1. When the melted fly ash inside the furnace hits the water-cooled wall heating surface, due to the action of the wind resistance of the cold tertiary air, the melted fly ash cannot contact the water-cooled wall heating surface. Even if individual fly ash contacts the water-cooled wall heating surface, under the action of the relatively strong cold tertiary air, it will be cooled in time and can be blown away, so that the melted fly ash cannot adhere to the heating surface, and finally it is ensured that the area around the burner body 1 is clean and no coking occurs on the heating surface; the present invention has the advantages of simple structure, enhanced adaptability of the boiler to coal types, never coking around the nozzle, no coke falling in the cold ash hopper, and no need for manual coke poking.

Claims

1. A cyclone burner for preventing coking, which comprises an air box body, a burner body and a secondary air box, and is characterized in that: Inside the air box body described above, a burner body is provided. Inside the burner body, a central air duct is provided. Below the right side of the central air duct, a central air blower is provided. On the left side of the central air blower, a drum-shaped body is provided. Below the drum-shaped body, a primary air duct is provided. On the left side of the drum-shaped body, a PA / PF pipe is provided. At the left end of the PA / PF pipe, a collector casting is provided. Outside the PA / PF pipe, a secondary air duct is provided. Inside the secondary air duct, a secondary air baffle is provided. Inside the secondary air baffle, a number of secondary air inner baffles are evenly arranged in a circumferential manner. Outside the secondary air duct, a tertiary air duct is provided. Outside the tertiary air duct, a stable combustion component is provided. In front of the stable combustion component, a number of annular edge holes are evenly arranged in a circumferential manner. Outside the stable combustion component, a mounting plate is provided. In front of the mounting plate, a number of mounting bolts are evenly arranged in a circumferential manner; Inside the secondary air box, a cold primary air duct is provided. Below the cold primary air duct, a number of tertiary air discs are evenly arranged from left to right. On the upper and lower sides of the right end of the secondary air box, guide discs are provided. Inside the central air duct, a central air passage is provided. Outside the central air duct, a toothed flow deflector is provided. A number of inner connecting rods for connecting the toothed flow deflector are evenly arranged in a circumferential manner on the outer circumference of the central air duct. A primary air passage is provided between the toothed flow deflector and the secondary air inner baffle. A number of outer connecting rods for connecting the secondary air inner baffle are evenly arranged on the outer side of the toothed flow deflector. The toothed flow deflector is composed of a number of spoiler vanes with an arc-shaped structure. Spoiler teeth are symmetrically arranged on the left and right sides of the outer side of the spoiler vane. A groove is provided inside the spoiler tooth.

2. The swirl burner for preventing coking according to claim 1, characterized in that: On the left side inside the secondary air duct, a secondary air swirl generator is provided. Inside the secondary air duct, a secondary air passage for the flow of secondary air is provided; On the right side inside the tertiary air duct, a tertiary air swirl generator is provided. Inside the tertiary air duct, a tertiary air passage for the flow of tertiary air is provided.

3. A swirl burner for preventing coking, as described in claim 1, characterized in that: The guide disc is installed in an extended manner by welding at the outer wall expansion cone of the secondary air passage at the burner nozzle.

4. The swirl burner for preventing coking according to claim 1, characterized in that: Sixteen mounting bolts are evenly arranged in a circumferential manner in front of the mounting plate. Sixteen annular edge holes are evenly arranged in a circumferential manner in front of the stable combustion component. Eight secondary air inner baffles are evenly arranged in a circumferential manner inside the secondary air baffle. Three inner connecting rods are evenly arranged in a circumferential manner on the outer circumference of the central air duct. Four outer connecting rods are evenly arranged on the outer side of the toothed flow deflector.

5. The swirl burner for preventing coking according to claim 1, characterized in that: Eight spoiler vanes are evenly arranged in a circumferential manner on the outer circumference of the toothed flow deflector.

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