CN203571729U - Rotational flow pulverized coal burner - Google Patents

Rotational flow pulverized coal burner Download PDF

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Publication number
CN203571729U
CN203571729U CN201320721148.5U CN201320721148U CN203571729U CN 203571729 U CN203571729 U CN 203571729U CN 201320721148 U CN201320721148 U CN 201320721148U CN 203571729 U CN203571729 U CN 203571729U
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CN
China
Prior art keywords
air
secondary air
channel
wind
tertiary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
Application number
CN201320721148.5U
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Chinese (zh)
Inventor
刘泰生
杨章宁
谢佳
张山鹰
但家瑜
李季梅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfang Boiler Group Co Ltd
Original Assignee
Dongfang Boiler Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to CN201320721148.5U priority Critical patent/CN203571729U/en
Application granted granted Critical
Publication of CN203571729U publication Critical patent/CN203571729U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a rotational flow pulverized coal burner which comprises a center air channel, a primary air channel, a secondary primary channel and a tertiary air channel. An oil gun pipe provided with an oil nozzle is arranged in the center channel, and an air outlet of the center channel is provided with a combustion stabilization cover. A pulverized coal concentrator is arranged in the primary air channel, and a secondary air rotational flow blade is arranged in the secondary air channel. A secondary air isolation layer is arranged between the secondary air channel and the primary air channel. Primary air blocking blocks for ejecting pulverized coal air flow by dividing the pulverized coal air flow into multiple streams are evenly distributed at the air outlet of the primary air channel in the circumferential direction. An air outlet of the secondary channel is evenly provided with secondary air blocking blocks with guide rods in the circumference direction, and an air outlet of the tertiary air channel is evenly provided with tertiary air blocking blocks with guide rods in the circumference direction. The rotational flow pulverized coal burner can easily reduce the discharge amount of nitric oxide of combustion pollutants, improve the adaptability to coal type variation, and enhance the ignition stability and is wide in application range.

Description

Vortex burner
Technical field
The utility model relates to a kind of burner, relates in particular to a kind of vortex burner, belongs to boiler-burner technical field.
Background technology
Turbulent burner is the device of a kind of combusting coal fines of extensive use on current station boiler and Industrial Boiler.At present, the principal mode of turbulent burner is Bi-register swirl burner.Bi-register swirl burner is mainly comprised of centre wind, wind, Secondary Air and a tertiary air.Along with improving constantly of environmental requirement in recent years, the nitrogen oxide emission that reduces coal burner is more and more urgent, and existing Bi-register swirl burner still needs to promote on nitrogen oxide emission.In addition, increasingly extensive along with power plant soot source, ature of coal is more unstable, and existing Bi-register swirl burner is still needing further lifting in steady combustion ability.
Utility model content
The purpose of this utility model is: a kind of vortex burner is provided, reduces the nitrogen oxide emission of Bi-register swirl burner, promote the adaptability to coal type change, strengthen combustion stability.
The purpose of this utility model is to realize by following technical proposals: a kind of vortex burner, comprise the center wind duct setting gradually from the inside to the outside, wind passage, secondary air channel and a tertiary air passage, the one oil gun pipe with oil burner nozzle is set along its axis in center wind duct, the air outlet place of described center wind duct is provided with steady combustion cover, in a described wind passage, be provided with pulverized coal concentrator, in described secondary air channel, be provided with Secondary Air swirl vane; Between described secondary air channel and a wind passage, be provided with a Secondary Air interlayer; The air outlet place of a wind passage is along the circumferential direction evenly equipped with a windage chock that breeze airflow is divided into several bursts of ejections, the air outlet place of the secondary air channel along the circumferential direction Secondary Air of equal strap guide rod blocks piece, and the air outlet place of the tertiary air passage along the circumferential direction tertiary air of equal strap guide rod blocks piece.
As optimal way, the air intake vent of described center wind duct is provided with centre wind damper, and described secondary air channel is provided with the secondary air regulation air door with guide rod, and described tertiary air passage is provided with the tertiary air damper with guide rod.
As optimal way, the air outlet place of a described wind passage is provided with a wind enlarging, and the air outlet place of secondary air channel is provided with Secondary Air enlarging, and the air outlet place of tertiary air passage is provided with tertiary air enlarging.
Further, the air outlet place of a wind enlarging and Secondary Air enlarging is equipped with block ring.
As optimal way, one time windage chock is 2-10.
As a kind of optimal way, on Secondary Air obstruction piece, Secondary Air is set and blocks piece guide rod, on tertiary air obstruction piece, tertiary air is set and blocks piece guide rod.
As another optimal way, Secondary Air blocks piece and tertiary air obstruction piece is the obstruction piece of a monoblock.
As optimal way, the section configuration that a described windage chock, Secondary Air block piece and tertiary air obstruction piece is one or more combinations in triangle, quadrangle, pentagon or streamline camber; And have 1-20 groove along the outer rim of wind direction.
Compared with prior art, the beneficial effects of the utility model: the choker bar of some is set by breeze airflow in the utility model vortex burner, Secondary Air air-flow and tertiary air air-flow are divided into some bursts of ejections, and be along the circumferential direction essentially staggered from air stream and breeze airflow, simultaneously a wind enlarging, the block ring of Secondary Air enlarging Increasing exports definite shape and area, delay air mixes with coal dust, be conducive to obviously reduce the oxygen concentration in this stage, reduce the discharge capacity of burning pollutant nitrogen oxide (NOx), the adaptability of lifting to coal type change, strengthen combustion stability, it is applied widely.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model vortex burner.
In figure: 1-is with the oil gun pipe of oil burner nozzle; 2-surely fires cover; Windage chock of 3-; 4-block ring; 5-Secondary Air blocks piece; 6-tertiary air blocks piece; A wind enlarging of 7-; The enlarging of 8-Secondary Air; The enlarging of 9-tertiary air; 10-center wind duct; Wind passage of 11-; 12-secondary air channel; 13-tertiary air passage; 14-pulverized coal concentrator; 15-mono-Secondary Air interlayer; 16-Secondary Air swirl vane; 17-centre wind damper; 18-secondary air regulation air door; 19-tertiary air damper; 20-Secondary Air blocks piece guide rod; 21-tertiary air blocks piece guide rod.
The specific embodiment
Below in conjunction with specific embodiment, the utility model is further described.
Disclosed all features in this description, or the step in disclosed all methods or process, except the speciality and/or step of mutual repulsion, all can combine by any way, unless narration especially, all can be replaced by other equivalences or the alternative features with similar object,, unless narration especially, an embodiment in a series of equivalences of each feature or similar characteristics.
As shown in Figure 1, the utility model vortex burner comprises the center wind duct 10 setting gradually from the inside to the outside, wind passage 11, secondary air channel 12 and a tertiary air passage 13, at the interior oil gun pipe 1 with oil burner nozzle that arranges along its axis of center wind duct 10, the air outlet place of described center wind duct 10 is provided with steady combustion cover 2, meets igniting needs.In a described wind passage 11, be provided with pulverized coal concentrator 14, the deep or light separation by pulverized coal concentrator, realizes bias combustion.In described secondary air channel 12, be provided with Secondary Air swirl vane 16, make to produce rotation by the air-flow of Secondary Air.Between described secondary air channel 12 and a wind passage 11, be provided with a Secondary Air interlayer 15.The air intake vent of described center wind duct 10 is provided with centre wind damper 17, can adjusting ignition point position, change recirculating zone size.Described secondary air channel 12 is provided with the secondary air regulation air door 18 with guide rod, and described tertiary air passage 13 is provided with the tertiary air damper 19 with guide rod.The air outlet place that the air outlet place of a described wind passage 11 is provided with 7, wind enlargings 7 of a wind enlarging and Secondary Air enlarging 8 is equipped with block ring 4; Further delayed, in the mixing of early stage air and fuel of catching fire and burn, to be conducive to suppress the generation of burning pollutant NOx.The air outlet place of secondary air channel 12 is provided with Secondary Air enlarging 8, and the air outlet place of tertiary air passage 13 is provided with tertiary air enlarging 9, for guiding air-flow, and aftercombustion air timely and reasonably.
It is 2-10 that the air outlet place of a wind passage 11 is along the circumferential direction evenly equipped with 3, windage chocks of a windage chock 3 that breeze airflow is divided into several bursts of ejections, and breeze airflow is divided into several bursts of ejections.Breeze airflow is divided into some strands after this windage chock of flowing through, after catching fire, burning, form independently flames of some thighs, than traditional flame, to the area change of water-cooling wall radiations heat energy, can effectively reduce peak flame temperature, reduce the generation of thermal NO.
Specifically, breeze airflow forms an obvious negative pressuren zone after the windage chock of flowing through, guiding thermal flue gas back stream; This negative pressuren zone is not the negative pressuren zone producing due to swirling eddy, is the negative pressuren zone newly increasing, and can be called secondary recirculating zone yet.The formation of this pair recirculating zone, makes coal powder ignition and volatile combustion stage have more flue gas to sneak into, and has reduced the oxygen concentration in the stage of catching fire, and is conducive to suppress the generation of burning pollutant NOx.Meanwhile, the thermal flue gas back stream heating breeze airflow after secondary recirculating zone guiding coal dust firing, for coal powder ignition provides more thermal source; A windage chock has also increased the contact area of breeze airflow and reflux heat flue gas, and breeze airflow is heated up more in time rapidly, has promoted flammability.In addition, block the He Zhu recirculating zone, secondary recirculating zone of piece formation together, make mixing and the disturbance of breeze airflow and reflux heat flue gas stronger, further promoted flammability.
The air outlet place of the secondary air channel 12 along the circumferential direction Secondary Air of equal strap guide rod blocks piece 5, and the position that Secondary Air blocks piece 5 does not overlap with the position of a windage chock 3.The air outlet place of the tertiary air passage 13 along the circumferential direction tertiary air of equal strap guide rod blocks piece 6.On Secondary Air obstruction piece 5, independent Secondary Air is set and blocks piece guide rod 20, on tertiary air obstruction piece 6, independent tertiary air is set and blocks piece guide rod 21; Or Secondary Air obstruction piece 5 and tertiary air obstruction piece 6 are that the obstruction piece of a monoblock designs, and adopt a guide rod to regulate and control; Guide rod can rationally regulate and block piece position, controls the incorporation time of wind and fuel.
After described Secondary Air, tertiary air air stream and the wind breeze airflow obstruction piece by air outlet place separately, present in a circumferential direction staggered state, delayed in the mixing of early stage air and fuel of catching fire and burn, obviously reduce the oxygen concentration in this stage, be conducive to suppress the generation of burning pollutant NOx.
In the present embodiment, according to obstruction number of blocks, shape, the appearance and size of wind passage of appropriate design, secondary air channel and the tertiary air channel exits such as certain area ratio, exit flow field, and have 1-20 groove along the outer rim of wind direction.The section configuration that a described windage chock 3, Secondary Air block piece 5 and tertiary air obstruction piece 6 is one or more combinations in triangle, quadrangle, pentagon or streamline camber, block piece and also can be certain thickness plate, air-flow is divided into some strands after the obstruction piece of flowing through.
By above-mentioned key measures, by the intense adjustment to each damper, reach best fired state; Reduce two nitrogen oxide emissions of adjusting wind turbulent burner, promote the adaptability to coal type change, strengthen combustion stability.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims (8)

1. a vortex burner, comprise the center wind duct (10), a wind passage (11), secondary air channel (12) and the tertiary air passage (13) that set gradually from the inside to the outside, the one oil gun pipe (1) with oil burner nozzle is set along its axis in center wind duct (10), it is characterized in that: the air outlet place of described center wind duct (10) is provided with steady combustion cover (2), in a described wind passage (11), be provided with pulverized coal concentrator (14), in described secondary air channel (12), be provided with Secondary Air swirl vane (16); Between described secondary air channel (12) and a wind passage (11), be provided with a Secondary Air interlayer (15); The air outlet place of a wind passage (11) is along the circumferential direction evenly equipped with a windage chock (3) that breeze airflow is divided into several bursts of ejections, the air outlet place of secondary air channel (12) the along the circumferential direction Secondary Air of equal strap guide rod blocks piece (5), and the air outlet place of tertiary air passage (13) the along the circumferential direction tertiary air of equal strap guide rod blocks piece (6).
2. vortex burner as claimed in claim 1, it is characterized in that: the air intake vent of described center wind duct (10) is provided with centre wind damper (17), described secondary air channel (12) is provided with the secondary air regulation air door (18) with guide rod, and described tertiary air passage (13) is provided with the tertiary air damper (19) with guide rod.
3. as the vortex burner as described in arbitrary in claim 1 or 2, it is characterized in that: the air outlet place of a described wind passage (11) is provided with a wind enlarging (7), the air outlet place of secondary air channel (12) is provided with Secondary Air enlarging (8), and the air outlet place of tertiary air passage (13) is provided with tertiary air enlarging (9).
4. vortex burner as claimed in claim 3, is characterized in that: the air outlet place of a wind enlarging (7) and Secondary Air enlarging (8) is equipped with block ring (4).
5. vortex burner as claimed in claim 1, is characterized in that: a windage chock (3) is 2-10.
6. vortex burner as claimed in claim 1, is characterized in that: Secondary Air is set on Secondary Air obstruction piece (5) and blocks piece guide rod (20), tertiary air is set on tertiary air obstruction piece (6) and blocks piece guide rod (21).
7. vortex burner as claimed in claim 1, is characterized in that: Secondary Air blocks piece (5) and tertiary air obstruction piece (6) is the obstruction piece of a monoblock.
8. the vortex burner as described in arbitrary claim in claim 6 or 7, is characterized in that: the section configuration that a described windage chock (3), Secondary Air block piece (5) and tertiary air obstruction piece (6) is one or more combinations in triangle, quadrangle, pentagon or streamline camber; And have 1-20 groove along the outer rim of wind direction.
CN201320721148.5U 2013-11-15 2013-11-15 Rotational flow pulverized coal burner Withdrawn - After Issue CN203571729U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320721148.5U CN203571729U (en) 2013-11-15 2013-11-15 Rotational flow pulverized coal burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320721148.5U CN203571729U (en) 2013-11-15 2013-11-15 Rotational flow pulverized coal burner

Publications (1)

Publication Number Publication Date
CN203571729U true CN203571729U (en) 2014-04-30

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103629663A (en) * 2013-11-15 2014-03-12 东方电气集团东方锅炉股份有限公司 Swirl pulverized coal burner
CN106090902A (en) * 2016-08-11 2016-11-09 东方电气集团东方锅炉股份有限公司 Annular return type brown coal turbulent burner and combustion method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103629663A (en) * 2013-11-15 2014-03-12 东方电气集团东方锅炉股份有限公司 Swirl pulverized coal burner
CN103629663B (en) * 2013-11-15 2016-02-24 东方电气集团东方锅炉股份有限公司 Vortex burner
CN106090902A (en) * 2016-08-11 2016-11-09 东方电气集团东方锅炉股份有限公司 Annular return type brown coal turbulent burner and combustion method
CN106090902B (en) * 2016-08-11 2018-04-06 东方电气集团东方锅炉股份有限公司 Annular return type lignite turbulent burner and combustion method

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C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20140430

Effective date of abandoning: 20160224

C25 Abandonment of patent right or utility model to avoid double patenting