CN111174199A - Multi-reflux flame adjustable low-nitrogen pulverized coal burner - Google Patents

Multi-reflux flame adjustable low-nitrogen pulverized coal burner Download PDF

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Publication number
CN111174199A
CN111174199A CN202010072637.7A CN202010072637A CN111174199A CN 111174199 A CN111174199 A CN 111174199A CN 202010072637 A CN202010072637 A CN 202010072637A CN 111174199 A CN111174199 A CN 111174199A
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CN
China
Prior art keywords
air
pulverized coal
pipe
cone
chamber
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Pending
Application number
CN202010072637.7A
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Chinese (zh)
Inventor
周国平
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Wuxi Shunmeng Science & Technology Co ltd
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Wuxi Shunmeng Science & Technology Co ltd
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Publication date
Application filed by Wuxi Shunmeng Science & Technology Co ltd filed Critical Wuxi Shunmeng Science & Technology Co ltd
Priority to CN202010072637.7A priority Critical patent/CN111174199A/en
Publication of CN111174199A publication Critical patent/CN111174199A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L1/00—Passages or apertures for delivering primary air for combustion 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20—Fuel flow guiding devices

Abstract

The patent provides a multi-return flame adjustable low-nitrogen pulverized coal burner capable of effectively reducing the discharge amount of NOx, which comprises a shell, wherein a precombustion chamber and a secondary air chamber are arranged in the shell; the inner peripheral part of the rear end of the primary air flaring body at the front end of the primary air pulverized coal pipe is provided with inner teeth which are distributed at intervals; the primary air pulverized coal pipe is internally provided with a central air pipe, and the outer part of the primary air pulverized coal pipe is sleeved with an inner secondary direct-current air pipe; the periphery of the front part of the central air pipe is provided with a small cone coal powder shade separator and a large cone coal powder shade separator; the front end part of the inner secondary direct-current air pipe is provided with an inner secondary direct-current air flaring body, and the rear part of the inner secondary direct-current air pipe is circumferentially provided with a plurality of air inlet grooves communicated with the secondary air chamber; an outer secondary cyclone air adjusting cone positioned in a secondary cyclone air cavity is sleeved on the periphery of the front part of the inner secondary direct-current air pipe, and the secondary cyclone air cavity is communicated with a secondary air chamber through outer secondary air cyclone adjusting blades; and a secondary rotational flow air outlet channel communicated with the precombustion chamber is formed between the front end of the outer secondary rotational flow air adjusting cone and the inner wall of the front end of the secondary rotational flow air cavity.

Description

Multi-reflux flame adjustable low-nitrogen pulverized coal burner
Technical Field
The patent relates to an industrial boiler pulverized coal burner.
Background
At present, NOx gas discharged in the process of burning coal in a boiler is an atmospheric pollutant which is harmful and difficult to treat. The prior treatment technology reduces NOx by ammonia after the NOx is generated by boiler combustion, which increases equipment investment and operation and maintenance cost.
Disclosure of Invention
The purpose of this patent is to provide a many back flows flame adjustable low nitrogen pulverized coal burner that can effectively reduce the emission of NOx.
To achieve the above object, the multi-return flame adjustable low nitrogen pulverized coal burner of the present patent comprises a housing having a pre-combustion chamber 34 at the front part thereof and a secondary air chamber 4 at the rear part thereof; the rear end of a primary air pulverized coal pipe 11 with the front end extending into the pre-combustion chamber 34 is provided with a primary air pulverized coal inlet 7, the front end of the primary air pulverized coal pipe 11 is provided with a primary air flaring body 22 with a large front end and a small rear end, and the inner periphery of the rear end of the primary air flaring body 22 is provided with inner teeth 21 distributed at intervals; a central air pipe 10 is arranged in the primary air pulverized coal pipe 11, and an inner secondary direct current air pipe 13 is sleeved outside the primary air pulverized coal pipe; the rear end of the central air pipe 10 is provided with a central air inlet 8, an ignition gas pipeline 9, an ignition air disc 17 and an ignition gas nozzle 18 are arranged in the central air pipe, the periphery of the front part of the central air pipe is provided with a small cone coal powder shade separator 19 and a large cone coal powder shade separator 20, the small cone coal powder shade separator 19 and the large cone coal powder shade separator 20 are both big front and small back, and the large cone coal powder shade separator 20 is positioned between the inner teeth 21 and the small cone coal powder shade separator 19 in the axial direction of the central air pipe 10; the front end part of the inner secondary direct-current air pipe 13 is provided with an inner secondary direct-current air flaring body 24 with a big front part and a small back part, and the rear part of the inner secondary direct-current air pipe is provided with a plurality of air inlet grooves 30 in the circumferential direction and communicated with the secondary air chamber 4; the inner secondary direct-current wind flaring body 24 is arranged on the outer periphery of the primary wind flaring body 22; an outer secondary cyclone air adjusting cone 15 is sleeved on the periphery of the front part of the inner secondary direct-current air pipe 13, the outer secondary cyclone air adjusting cone 15 is positioned in a secondary cyclone air cavity 32 on the periphery of the front part of the inner secondary direct-current air pipe 13, and the secondary cyclone air cavity 32 is communicated with the secondary air chamber 4 through outer secondary cyclone adjusting blades 16; a secondary cyclone air outlet channel 33 which is small in front and big in back and is communicated with the precombustion chamber 34 is formed between the front end of the outer secondary cyclone air adjusting cone 15 and the inner wall of the front end of the secondary cyclone air cavity 32.
The multi-return flame adjustable low-nitrogen pulverized coal burner is characterized in that the back part in the shell is provided with a tertiary air chamber 2, the back part of an annular combustion stabilizing chamber 26 arranged on the periphery of a pre-combustion chamber 34 is communicated with the tertiary air chamber 2, and the periphery of the end of the shell is provided with a plurality of tertiary air pipes 25 communicated with the annular combustion stabilizing chamber 26.
In the multi-reflux flame adjustable low-nitrogen pulverized coal burner, the primary air flaring body 22 is circumferentially provided with a plurality of uniformly distributed long grooves 35.
In the multi-reflux flame adjustable low-nitrogen pulverized coal burner, the large-cone pulverized coal dilution separator 20 is provided with four annular grooves 36 along the circumferential direction.
The multi-return-flow flame adjustable low-nitrogen pulverized coal burner further comprises an inner secondary direct-current air adjusting door 14 used for adjusting the opening size of the air inlet groove 30, the inner secondary direct-current air adjusting door 14 and a screw rod 31 driving the inner secondary direct-current air adjusting door to move in the direction parallel to the axial direction of the inner secondary direct-current air pipe 13, the screw rod 31 is connected with an inner secondary direct-current air adjusting handle 6 arranged outside the shell, the inner secondary direct-current air adjusting door 14 can be driven to move axially through the screw rod 31 through the inner secondary direct-current air adjusting handle 6, the opening size of the air inlet groove 30 is changed, and the air quantity entering the inner secondary direct-current air pipe 13 from the secondary air chamber 4 through the air inlet groove 30 is adjusted.
In the multi-reflux flame adjustable low-nitrogen pulverized coal burner, the outer secondary cyclone air adjusting cone 15 is connected with an adjusting mechanism which drives the outer secondary cyclone air adjusting cone to move along the axial direction and comprises a cone adjusting handle 12, and the cone adjusting handle 12 is arranged outside the shell.
The multi-return flame adjustable low-nitrogen pulverized coal burner has a heat storage material 23 between the annular preheating chamber 26 and the precombustion chamber 34.
In the multi-reflux flame adjustable low-nitrogen pulverized coal burner, the secondary air chamber 4 is communicated with the outlet of the fan through the secondary air main adjusting door 3.
In the multi-reflux flame adjustable low-nitrogen pulverized coal burner, the tertiary air chamber 2 is communicated with the outlet of the fan through the tertiary air adjusting door 1.
The beneficial effect of this patent:
the coal powder enters the primary air coal powder pipe 11 from the primary air coal powder inlet 7 and then is sent to the pre-combustion chamber 34 to be ignited and combusted through the ignition gas nozzle 18. The wind coal powder passes through a small cone coal powder concentration separator 19 and a large cone coal powder concentration separator 20, so that the coal powder is subjected to concentration separation, and the wind blown into the precombustion chamber by the central wind pipe 10 can generate a central high-temperature flue gas reflux area to heat the central coal powder; the internal tooth 21 only can be walked around to the buggy of circumference in the wind coal dust pipe 11 once, owing to there is the internal tooth 21 effect, can produce a plurality of high temperature flue gas little recirculation zones in its tip circumference, and the buggy air current is crossed with circumference recirculation zone between the circumference internal tooth, has improved and has heated the effect to circumference buggy, and great buggy granule preheats and rolls over back to central recirculation zone again after meeting the internal tooth striking simultaneously, heats once more. The coal powder concentration in the circumferential direction in the primary air coal powder pipe 11 is high, but the oxygen in the combustion area is insufficient, while the coal powder concentration in the central area is low, and the combustion temperature is low, so that the generation of NOx is inhibited.
The secondary air is adjusted and controlled by a secondary air main adjusting door 3, and an inner secondary direct-current air adjusting handle 6 is used for adjusting an inner secondary direct-current air adjusting door 14 to control the size of the inner secondary direct-current air; the swirl strength is adjusted by the outer secondary swirl adjusting handle 5 through the outer secondary swirl adjusting blade 16, and the air supply quantity and the flame length can be adjusted by adjusting the outer secondary swirl adjusting cone 15 through the cone adjusting handle 12. Because the primary air flaring body 22 and the inner secondary direct-current air flaring body 24 are arranged, the secondary air is prevented from being introduced into combustion too early, but in order to achieve stable combustion, the secondary direct-current air can pass through the circumferential long groove of the primary air flaring body 22 to provide partial oxygen for a combustion area.
Because the larger combustion stabilizing chamber 26 is arranged, a larger backflow area can be formed in the inner circumferential direction, more high-temperature flue gas is provided for heating pulverized coal, and meanwhile, the heat storage material 23 can stabilize the temperature of the flue gas, so that the pulverized coal can be heated by multiple times of backflow flue gas in the combustion process, and secondary air quantity and intervention time are controlled simultaneously by graded air supply, so that the pulverized coal is combusted at low NOx; when the combustion flame reaches the outlet of the combustion stabilizing chamber 26, because the tertiary air pipes 25 are circumferentially and independently arranged, flue gas backflow can be formed between every two tertiary air pipes 25 to participate in heating and combustion of pulverized coal, and when the flame reaches the far outer part of the combustion stabilizing chamber 26, the tertiary air pipes 25 provide the air quantity for complete combustion of the pulverized coal.
Through the multi-reflux zone, the pulverized coal is heated in a grading way, and meanwhile, the air is supplied for burning in a grading way, so that the burning temperature of the pulverized coal is reduced, the generation of NOx is effectively reduced, and the multi-reflux zone pulverized coal gasification furnace has good adaptability to inferior pulverized coal. The flame length is adjustable, and the adaptability to boilers is wide.
In a word, in order to reduce the discharge amount of NOx, the invention improves the combustion condition of the pulverized coal in the furnace, makes full use of the internal flue gas circulation of the pulverized coal burner, not only heats the pulverized coal in a central reflux area, but also effectively heats the pulverized coal by grading multiple parts; the graded adjustable air supply combustion also improves the adaptability of the combustor to the coal quality change, thereby realizing the low NOx emission and stable combustion of the pulverized coal combustor; meanwhile, the flame is adjustable, the structural matching of more boilers is good, and the thermal efficiency of the boilers is improved.
Drawings
FIG. 1 is a front view of a multiple-flame-return adjustable low-nitrogen pulverized coal burner;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a structural view of a center air duct, a primary air pulverized coal duct, etc.;
FIG. 5 is a schematic view of the internal teeth and primary air flaring body;
FIG. 6 is a left side view of FIG. 5;
FIG. 7 is a schematic diagram of a small cone coal fines thickener separator;
FIG. 8 is a front view of a large cone coal fines thickener separator;
FIG. 9 is a left side view of FIG. 8;
FIG. 10 is a perspective view of a multiple back-flow flame adjustable low nitrogen pulverized coal burner;
FIG. 11 is a perspective view of an outer secondary air swirl regulating vane or the like;
fig. 12 is a perspective view of an outer secondary cyclone air adjusting cone or the like.
Detailed Description
The technical scheme of the patent is explained in detail by specific examples.
Referring to fig. 1-3, the multi-reflux flame adjustable low-nitrogen pulverized coal burner comprises a primary air pulverized coal pipe 11 with an elbow, wherein a primary air pulverized coal inlet 7 is arranged at the outer end of the primary air pulverized coal pipe, inner teeth 21 and a primary air flaring body 22 are arranged at the other end of the primary air pulverized coal pipe, and four long grooves 35 are uniformly distributed on the circumferential direction of the primary air flaring body 22 along a cone. A central air pipe 10 is arranged in the primary air pulverized coal pipe 11, and an inner secondary direct current air pipe 13 is sleeved outside the primary air pulverized coal pipe; the outer end of the central air pipe 10 is provided with a central air inlet 8, an ignition gas pipeline 9, an ignition air disc 17 and an ignition gas nozzle 18 are arranged in the central air pipe, a small cone coal powder concentration separator 19 and a large cone coal powder concentration separator 20 are arranged outside the central air pipe, and the large cone coal powder concentration separator 20 is provided with four annular grooves 36 along the circumferential direction; the end of the inner secondary direct-current air pipe 13 is provided with an inner secondary direct-current air flaring body 24, and six air inlet grooves 30 are circumferentially arranged at the outer part of the inner secondary direct-current air adjusting door 14. The size adjustment of the inner secondary direct-current air adjusting door 14 can be controlled by the operation of the inner secondary direct-current air adjusting handle 6 so as to adjust the opening size of the air inlet groove 30, which belongs to the prior art. An outer secondary cyclone air adjusting cone 15 is sleeved outside the inner secondary direct current air pipe 13, the outer secondary cyclone air adjusting cone 15 is connected with a cone adjusting handle 12, and the axial position of the outer secondary cyclone air adjusting cone 15 can be adjusted through the cone adjusting handle 12, which belongs to the prior art. The secondary air chamber 4 is internally provided with an outer secondary air swirl adjusting blade 16, the outer secondary air swirl adjusting blade 16 is connected with an outer secondary swirl air adjusting handle 5, the angle of the outer secondary air swirl adjusting blade 16 can be adjusted through the outer secondary swirl air adjusting handle 5, and then the air quantity entering the secondary swirl air cavity 32 from the secondary air chamber 4 is adjusted, which belongs to the prior art. The end part of the secondary air chamber 4 is provided with a secondary air main adjusting door 3. A tertiary air adjusting door 1 is installed at the end of the tertiary air chamber 2. The flame ejection end of the burner is provided with a combustion stabilizing chamber 26, the interior of the combustion stabilizing chamber is provided with a heat storage material 23, and the circumferential end part of the combustion stabilizing chamber is provided with twelve uniformly distributed tertiary air pipes 25.
The coal powder conveying system conveys coal powder into the primary air coal powder pipe 11 from the primary air coal powder inlet 7, then the coal powder is conveyed to the pre-combustion chamber 34 and is ignited and combusted through the ignition gas nozzle 18. The wind coal powder passes through a small cone coal powder concentration separator 19 and a large cone coal powder concentration separator 20, so that the coal powder is subjected to concentration separation, and a central air pipe 10 can generate a central high-temperature flue gas reflux area to heat the central coal powder; the internal tooth 21 only can be walked around to the buggy of circumference in the wind coal dust pipe 11 once, owing to there is the internal tooth 21 effect, can produce a plurality of high temperature flue gas little recirculation zones in its tip circumference, and the buggy air current is crossed with circumference recirculation zone in the circumference internal tooth, has improved and has heated the effect to circumference buggy, and great buggy granule preheats and rolls over back to central recirculation zone again after meeting the internal tooth striking simultaneously, heats once more. The coal powder concentration in the circumferential direction in the primary air coal powder pipe 11 is high, but the oxygen in the combustion area is insufficient, while the coal powder concentration in the central area is low, and the combustion temperature is low, so that the generation of NOx is inhibited.
The secondary air is adjusted and controlled by a secondary air main adjusting door 3, and an inner secondary direct-current air adjusting handle 6 is used for adjusting an inner secondary direct-current air adjusting door 14 to control the size of the inner secondary direct-current air; the swirl strength is adjusted by the outer secondary swirl adjusting handle 5 through the outer secondary swirl adjusting blade 16, and the air supply quantity and the flame length can be adjusted by adjusting the outer secondary swirl adjusting cone 15 through the cone adjusting handle 12. Because the primary air flaring body 22 and the inner secondary direct-current air flaring body 24 are arranged, the secondary air is prevented from being introduced into combustion too early, but in order to achieve stable combustion, the secondary direct-current air can pass through the circumferential long groove of the primary air flaring body 22 to provide partial oxygen for a combustion area.
Because the larger combustion stabilizing chamber 26 is arranged, a larger backflow area can be formed in the inner circumferential direction, more high-temperature flue gas is provided for heating pulverized coal, and meanwhile, the heat storage material 23 can stabilize the temperature of the flue gas, so that the pulverized coal can be heated by multiple times of backflow flue gas in the combustion process, and secondary air quantity and intervention time are controlled simultaneously by graded air supply, so that the pulverized coal is combusted at low NOx; when the combustion flame reaches the outlet of the combustion stabilizing chamber 26, because the tertiary air pipes 25 are circumferentially and independently arranged, flue gas backflow can be formed between every two tertiary air pipes 25 to participate in heating and combustion of pulverized coal, and when the flame reaches the far outer part of the combustion stabilizing chamber 26, the tertiary air pipes 25 provide the air quantity for complete combustion of the pulverized coal.
Through the multi-backflow area, the pulverized coal is heated in a grading mode, meanwhile, air is supplied for combustion in a grading mode, the pulverized coal combustion temperature is reduced, the generation of NOx is effectively reduced, and the multi-backflow area pulverized coal burner has good adaptability to inferior pulverized coal. The flame length is adjustable, and the adaptability to boilers is wide.

Claims (9)

1. A multi-reflux flame adjustable low-nitrogen pulverized coal burner is characterized in that: comprises a shell, wherein the front part in the shell is provided with a precombustion chamber (34), and the inner rear part is provided with a secondary air chamber (4); the rear end of a primary air pulverized coal pipe (11) with the front end extending into the pre-combustion chamber (34) is provided with a primary air pulverized coal inlet (7), the front end of the primary air pulverized coal pipe (11) is provided with a primary air flaring body (22) with a large front end and a small rear end, and the inner periphery of the rear end of the primary air flaring body (22) is provided with inner teeth (21) distributed at intervals; a central air pipe (10) is arranged in the primary air pulverized coal pipe (11), and an inner secondary direct current air pipe (13) is sleeved outside the primary air pulverized coal pipe; the rear end of the central air pipe (10) is provided with a central air inlet (8), an ignition gas pipeline (9), an ignition air disc (17) and an ignition gas nozzle (18) are arranged in the central air pipe, the periphery of the front part of the central air pipe is provided with a small cone coal powder shade separator (19) and a large cone coal powder shade separator (20), the small cone coal powder shade separator (19) and the large cone coal powder shade separator (20) are both large in front and small in back, and the large cone coal powder shade separator (20) is positioned between the inner teeth (21) and the small cone coal powder shade separator (19) in the axial direction of the central air pipe (10); the front end part of the inner secondary direct-current air pipe (13) is provided with an inner secondary direct-current air flaring body (24) with a big front part and a small back part, and the rear part of the inner secondary direct-current air pipe is provided with a plurality of air inlet grooves (30) in the circumferential direction and communicated with the secondary air chamber (4); the inner secondary direct-current air flaring body (24) is arranged on the peripheral part of the primary air flaring body (22); an outer secondary cyclone air adjusting cone (15) is sleeved on the periphery of the front part of the inner secondary direct-current air pipe (13), the outer secondary cyclone air adjusting cone (15) is positioned in a secondary cyclone air cavity (32) on the periphery of the front part of the inner secondary direct-current air pipe (13), and the secondary cyclone air cavity (32) is communicated with the secondary air chamber (4) through outer secondary air cyclone adjusting blades (16); a secondary cyclone air outlet channel (33) which is small in front and big in back and is communicated with the precombustion chamber (34) is formed between the front end of the outer secondary cyclone air adjusting cone (15) and the inner wall of the front end of the secondary cyclone air cavity (32).
2. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 1, characterized in that: the back part in the shell is provided with a tertiary air chamber (2), the back part of an annular combustion stabilizing chamber (26) arranged at the periphery of the precombustion chamber (34) is communicated with the tertiary air chamber (2), and the periphery of the end of the shell is provided with a plurality of tertiary air pipes (25) which are communicated with the annular combustion stabilizing chamber (26).
3. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 1, characterized in that: the primary air flaring body (22) is circumferentially provided with a plurality of uniformly distributed long grooves (35).
4. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 1, characterized in that: the large cone coal powder concentration separator (20) is provided with four annular grooves (36) along the circumferential direction.
5. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 1, characterized in that: the novel air conditioner further comprises an inner secondary direct-current air adjusting door (14) used for adjusting the opening size of the air inlet groove (30), the inner secondary direct-current air adjusting door (14) is connected with a screw rod (31) which drives the inner secondary direct-current air adjusting door to move in the direction parallel to the axial direction of the inner secondary direct-current air pipe (13), the screw rod (31) is connected with an inner secondary direct-current air adjusting handle (6) arranged outside the shell, the inner secondary direct-current air adjusting door (14) can be driven to move axially through the screw rod (31) through the inner secondary direct-current air adjusting handle (6), the opening size of the air inlet groove (30) is changed, and the air quantity entering the inner secondary direct-current air pipe (13) from the secondary air chamber (4) through the air inlet groove (30) is.
6. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 1, characterized in that: the outer secondary cyclone air adjusting cone (15) is connected with an adjusting mechanism which drives the outer secondary cyclone air adjusting cone to move along the axial direction and comprises a cone adjusting handle (12), and the cone adjusting handle (12) is arranged outside the shell.
7. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 1, characterized in that: a heat storage material (23) is arranged between the annular preheating chamber (26) and the precombustion chamber (34).
8. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 1, characterized in that: the secondary air chamber (4) is communicated with the outlet of the fan through a secondary air main adjusting door (3).
9. The multiple-return-flame adjustable low-nitrogen pulverized coal burner of claim 2, characterized in that: the tertiary air chamber (2) is communicated with the outlet of the fan through a tertiary air adjusting door (1).
CN202010072637.7A 2020-01-21 2020-01-21 Multi-reflux flame adjustable low-nitrogen pulverized coal burner Pending CN111174199A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010072637.7A CN111174199A (en) 2020-01-21 2020-01-21 Multi-reflux flame adjustable low-nitrogen pulverized coal burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010072637.7A CN111174199A (en) 2020-01-21 2020-01-21 Multi-reflux flame adjustable low-nitrogen pulverized coal burner

Publications (1)

Publication Number Publication Date
CN111174199A true CN111174199A (en) 2020-05-19

Family

ID=70658194

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010072637.7A Pending CN111174199A (en) 2020-01-21 2020-01-21 Multi-reflux flame adjustable low-nitrogen pulverized coal burner

Country Status (1)

Country Link
CN (1) CN111174199A (en)

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