CN108730970A - Five-channel coal-powder combustor - Google Patents
Five-channel coal-powder combustor Download PDFInfo
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- CN108730970A CN108730970A CN201710246257.9A CN201710246257A CN108730970A CN 108730970 A CN108730970 A CN 108730970A CN 201710246257 A CN201710246257 A CN 201710246257A CN 108730970 A CN108730970 A CN 108730970A
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- wind
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- 239000000843 powder Substances 0.000 title claims abstract description 25
- 239000003245 coal Substances 0.000 claims abstract description 44
- 239000007921 spray Substances 0.000 claims description 5
- 230000010006 flight Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 36
- 239000002817 coal dust Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 12
- 239000000446 fuel Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000000505 pernicious effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of Five-channel coal-powder combustors, belong to coal burner field, it is desirable to provide a kind of Five-channel coal-powder combustor can reduce the production quantity of NOx in coal burner.Its key points of the technical solution are that：A kind of Five-channel coal-powder combustor, central air hose, eddy flow airduct, coal air hose including coaxial arrangement and outer shaft stream air hose, the outer coaxial sleeve of the outer shaft stream air hose is equipped with balance wind pipe, one end of the balance wind pipe, which extends internally, is provided with flange one, it is semicircular balance air holes that one inner wall of the flange, which is axially provided with section along balance wind pipe, and the balance air holes circumference array is arranged in one inner wall of flange.
Description
Technical field
The present invention relates to a kind of coal burner, more particularly to a kind of Five-channel coal-powder combustor.
Background technology
Nitrogen oxides (NOx) is the primary pollution source for causing atmosphere pollution, and coal burning is one of main source of NOx,
In order to which NOx pollutes with controlling getting worse, State Bureau of Environmental Protection promulgated on March 7th, 1996《Thermal power plant atmosphere pollution row
Put standard》(GB13223-26), clear stipulaties 300MW and above unit dry-bottom pulverized coal furnace NOx discharge be not in standard
It obtains more than 650mg/m3If not taking low NOx drainage measure, it is difficult to meet the emission request of NOx.September executes on the 1st within 2000
's《The Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution》It also proposed the requirement administered to NOx emission.There are mainly two types of NOx controls
Approach, first, the generation of NOx is reduced using low NO technology, second is that removing NOx from flue gas.In the current warp in China
Under Ji is horizontal, the former is more effective, economically viable method；The main problem of the latter is to invest too high, is not suitable for China
National conditions.Turbulent burner occupies certain ratio in China's station boiler and other coal dust application fields.Using swirl flow combustion
The large coal powder boiler of device has the advantages that its uniqueness：First choice can be to avoid the mistake generated using DC burner corner tangential firing
The thermal deviation in the areas Re Qi；Followed by there is no strict requirements to burner hearth shape, it is not necessary to which certain close to square, this gives tail portion convection current
The arrangement of heating surface brings great convenience.Turbulent burner, as stable heat source, makes coal dust gas by high temperature recirculation zone
Stream in time fight and stablize burning, the mixing of common turbulent burner primary and secondary air is strong, and temperature peak is high, and NOx generation amount is big.
As China's unit increasingly develops to large capacity, urgent requirement is proposed to the development of spiral-flow powdered coal burning technology.Therefore, it grinds
It is all to have highly important meaning to the development of China's power industry and entire national economy to study carefully low NOx cyclone pulverized coal combustion
Justice.
Invention content
The object of the present invention is to provide a kind of Five-channel coal-powder combustors, can reduce the life of NOx in coal burner
Cheng Liang.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of Five-channel coal-powder combustor, including the central air hose of coaxial arrangement, eddy flow airduct, coal air hose and outer shaft stream air hose,
The outer coaxial sleeve of the outer shaft stream air hose is equipped with balance wind pipe, and one end of the balance wind pipe, which extends internally, is provided with flange one, institute
It states one inner wall of flange and is axially provided with section along balance wind pipe as semicircular balance air holes, and the balance air holes Circle-Array
Row are arranged in one inner wall of flange.
Through the above scheme, the central air hose inside and outside coal air hose, eddy flow airduct and outer shaft stream air hose still use a typhoon
Machine air feed increases a centrifugal blower for balancing air hose and provides balance wind, be the principle based on coal injection pipe high speed difference, strengthens
Coal injection pipe multistage air feed effect；To effectively reduce pernicious gas, and head coking is prevented, extends the use of coal powder injection tube head
Service life；And play the role of the normal operation of three big main channels in firm, reduce maintenance cost.The setting of flange one to balance
Air hose end narrows, and when balance wind enters in balance air holes, wind speed improves, and strengthens its stirring effect to coal dust.
Balancing air duct simultaneously can effectively prevent the head of burner to wear and keep the flame of definite shape, prevent office
The phenomenon that portion's high temperature scaling loss kliner coating.For the burner of this structural shape since channel wind speed is higher, the thrust of burner is big, can meet
The abundant after-flame of various fuel, it is highly beneficial to the utilization for improving colm.Simultaneously because primary net air quantity is low, First air（Contain
Coal wind and net wind）Ratio only has 8.6%, can accordingly reduce the production quantity of NOx in coal burner.
Further, the outer shaft stream air hose end, which is located at outward at outer axis stream air passage two, is provided with flange two, described
There are gaps between flange two and flange one.
Through the above scheme, it is poured in into gap in balance wind from entering to balance in air holes, in outer shaft stream air hose shape cyclization
Stream improves the mixed effect of air and coal dust.
Further, two length of the flange is less than the length of flange one, and the flange one and flange two are in pipeline
The one end in portion is respectively arranged with inclined-plane one and inclined-plane two.
Through the above scheme, the wind direction for balancing wind changes at inclined-plane one and inclined-plane two respectively, thus flat entering
Vortex is formed when in the air holes that weighs, the vortex wind of blowout, which has coal dust, breaks up effect, can more burn completely.
Further, the balance air holes inner wall is provided with several flights along its axial array.
Through the above scheme, flight can improve the size of the vortex wind blown out out of balance air holes.
Further, the balance air holes outer end face is provided with chamfering.
Through the above scheme, chamfering is used to reduce resistance of the end face to balancing wind.
Further, the balance wind pipe outer wall is provided with fire resisting mud layer.
Through the above scheme, fire resisting mud layer has protective effect to pipe fitting, reduces damage of the high temperature to pipe fitting.
Further, one end inside horizontal extension of the outer shaft stream air hose with flange two is provided with boss, described convex
Outer shaft stream air hose axial direction array is provided with several outer shaft stream wind exhaust vents in platform.
Through the above scheme, outer shaft stream wind exhaust vent is for blowing out outer shaft stream wind.
Further, the central air hose end set has cricoid centre wind nozzle, the centre wind inner coaxial tube to set
It is equipped with spray bar, the circumferentially uniformly distributed several centre wind exhaust vents of the centre wind nozzle face.
Through the above scheme, centre wind exhaust vent is for blowing out centre wind, for supplementing the air in the middle part of pipeline.
Further, it is provided with air storing cavity on the left of the centre wind exhaust vent.
Through the above scheme, air storing cavity is used for gas storage, so that the wind energy of center air holes is enough more balanced.
Further, the centre wind nozzle fixed sleeves are equipped with guide ring, the circumferentially uniformly distributed several spirals of guide ring outer wall
Diversion trench.
Through the above scheme, spiral stream guidance slot directly contacts with coal dust for blowing out spiral wind, accelerates the expansion of coal dust
It dissipates.Guide ring is detachable, to obtain different Whirl deposite tanks.
In conclusion the invention has the advantages that：
1, the central air hose inside and outside coal air hose, eddy flow airduct and outer shaft stream air hose still use a Fans air feed, increase by one
Centrifugal blower provides balance wind for balancing air hose, is the principle based on coal injection pipe high speed difference, enhances the confession of coal injection pipe multistage
Wind effect；To effectively reduce pernicious gas, and head coking is prevented, extends coal powder injection tube head service life；And have firm
The effect of the normal operation of interior three big main channel, reduces maintenance cost.The setting of flange one makes balance wind pipe end narrow,
When balance wind enters in balance air holes, wind speed improves, and strengthens its stirring effect to coal dust；
2 at the same balance air duct can effectively prevent burner head wear and keep definite shape flame, prevent part
The phenomenon that high temperature scaling loss kliner coating.For the burner of this structural shape since channel wind speed is higher, the thrust of burner is big, can meet each
The abundant after-flame of kind fuel, it is highly beneficial to the utilization for improving colm.Simultaneously because primary net air quantity is low, First air（Containing coal
Wind and net wind）Ratio only has 8.6%, can accordingly reduce the production quantity of system NOx.
Description of the drawings
Fig. 1 is embodiment for embodying its integrally-built schematic diagram；
Fig. 2 is the schematic diagram that embodiment is used to embody itself and kiln connecting pin internal structure；
Fig. 3 is the enlarged drawing at A in Fig. 2；
Fig. 4 is the enlarged drawing at B in Fig. 3；
Fig. 5 is the schematic diagram that embodiment is used to embody nozzle face structure.
In figure, 1, spray bar；2, central air hose；3, eddy flow airduct；4, coal air hose；5, outer shaft stream air hose；51, flange two；
511, inclined-plane two；52, gap；6, balance wind pipe；61, flange one；611, inclined-plane one；62, air holes is balanced；621, chamfering；63, spiral shell
Blade；601, center air duct；602, swirl air duct；603, coal air duct；604, outer axis stream air passage；605, air duct is balanced；606, it props up
Bracer；7, centre wind nozzle；701, centre wind exhaust vent；702, air storing cavity；703, outer shaft stream wind exhaust vent；8, guide ring；
801, spiral stream guidance slot；9, boss；10, wind-guiding column；11, outer shaft stream wind enters the wind conduit；12, Whirl deposite tank enters the wind conduit；13, center
Wind enters the wind conduit；14, coal wind conduit；15, wind air induction conduit is balanced；16, anchoring piece；17, fire resisting mud layer；18, telescopic joint；19,
Fuel injector；20, overhead crane support；21, reinforcing rib.
Specific implementation mode
A kind of Five-channel coal-powder combustor, as shown in Figure 1, Figure 2 with shown in Fig. 4, burner right end is connected with kiln in figure, is used for
It includes the fuel injector pipe 1 being sequentially coaxially socketed from inside to outside, central air hose to convey air and coal dust, the coal burner to kiln
2, eddy flow airduct 3, coal air hose 4, outer shaft stream air hose 5 and balance wind pipe 6.
Such as Fig. 2 and 3, fuel injector pipe 1 installs fuel injector 19 for grafting, in being formed between fuel injector pipe 1 and central air hose 2
Heart air duct 601, forms swirl air duct 602 between central air hose 2 and eddy flow airduct 3, coal air hose 4 forms coal wind with eddy flow airduct 3
Road 603, outer shaft stream air hose 5 form outer axis stream air passage 604 with coal air hose 4, are formed between balance wind pipe 6 and outer shaft stream air hose 5 flat
Weighing apparatus air duct 605.Supporting block 606 is both provided between adjacent channel, to improve integral strength；The setting of 6 outer surface of balance wind pipe is big
Anchoring piece 16 is measured, fire clay layer 17 is set outside anchoring piece 16, for protecting pipe fitting, anchoring piece 16 to be embedded in fire resisting mud layer 17,
Play fixed function.
As shown in Figure 1, the one end of burner far from kiln is provided with wind-guiding column 10, setting is respectively communicated on wind-guiding column 10
Have：
Outer shaft stream wind air induction conduit 11, is connected to outer shaft stream air hose 5；
Whirl deposite tank enters the wind conduit 12, is connected to eddy flow airduct 3；
Centre wind enters the wind conduit 13, is connected to central air hose 2；
4 side of coal air hose is provided with and communicated with coal wind conduit 14；It is provided with and communicated with balance wind air induction conduit in 6 outer wall of balance wind pipe
15。
Between coal air hose 4 and outer shaft stream air hose 5 be arranged telescopic joint 18, telescopic joint 18 be flexible structure, when burner operation simultaneously
When vibrating, telescopic joint 18 can absorb vibration, reduce influence of the vibration equipment to pipeline, and protection burner is injury-free.
As shown in Fig. 2, setting up overhead crane support 20 between coal air hose 4 and outer shaft stream air hose 5, to be connected with driving, work as burning
When device maintenance down, it can be detached from working position by the mobile burner of driving, correspondingly, on the junction of outer shaft stream air hose 5,
Equipped with reinforcing rib 21, to improve pipeline integral strength.
As shown in Fig. 3 and Fig. 5,2 end of central air hose is arranged with centre wind nozzle 7, and 7 right side of centre wind nozzle is all in figure
To being evenly equipped with several centre wind exhaust vents 701, and the centre wind exhaust vent 701 is provided with two rows, centre wind exhaust vent 701
Left side is provided with air storing cavity 702；7 fixed sleeves of centre wind nozzle are equipped with guide ring 8, the circumferentially uniformly distributed several spiral shells of 8 outer wall of guide ring
Diversion trench 801 is revolved, and 8 outer wall of guide ring is contradicted with 3 inner wall of eddy flow airduct；5 end of outer shaft stream air hose extend internally setting it is convex
Platform 9, boss 9 are contradicted with 4 outer wall of coal air hose, and 9 inner circumferential of boss is evenly distributed with several outer shaft stream wind exhaust vents 703, to spray outer shaft
Flow wind.
The right part of balance wind pipe 6, which extends internally, is provided with flange 1, and one 61 inner wall of flange is axially set along balance wind pipe 6
It is semicircular balance air holes 62 to be equipped with section, and balances the setting of 62 circumference array of air holes in one 61 inner wall of flange, balances wind
62 inner wall of hole is provided with several flights 63 along its axial array, and balance 62 outer end face of air holes is provided with chamfering 621.Outer shaft stream wind
5 end of pipe is located at outer axis stream air passage 604 outward is provided with flange 2 51, and 2 51 length of flange is less than the length of flange 1
Degree, there are gaps between flange 2 51 and flange 1.The one end of flange 1 and flange 2 51 inside pipeline is set respectively
It is equipped with inclined-plane 1 and inclined-plane 2 511.
Explanation is embodied：
When burner starts, the pressurization of fuel injector 19 sprays atomized diesel fuel, is lighted by the igniter in kiln, coal dust passes through coal wind
Pipe 4 is blown into kiln, central air hose 2, eddy flow airduct 3 and outer shaft stream air hose 5 by wind-guiding column 10 to wind, and is gone out respectively by centre wind
Air holes 701, spiral stream guidance slot 801 and outer shaft stream wind exhaust vent 703 are blown out.It is flat that the offer of air hose 6 is balanced with a centrifugal blower
Weighing apparatus wind enhances coal injection pipe multistage air feed effect based on the principle of coal injection pipe high speed difference.
For coal dust after diesel oil ignited, fuel injector 19 stops oil spout.The wind direction of wind is balanced respectively on inclined-plane 1 and inclined-plane two
It changes at 511, to form vortex when entering in balance air holes 62, the vortex wind of blowout, which has coal dust, breaks up work
With, can more burn completely.It is poured in into gap 52 in balance wind from entering to balance in air holes 62, in outer shaft stream air hose
Circulation is formed outside 5, improves the mixed effect of air and coal dust.To effectively reduce pernicious gas, and head coking is prevented, extended
Coal powder injection tube head service life；And play the role of the normal operation of three big main channels in firm, reduce maintenance cost.Flange
One 61 setting makes 6 end of balance wind pipe narrow, and when balance wind enters in balance air holes 62, wind speed improves, and strengthens it
To the stirring effect of coal dust.Burner head exists by high temperature gases recirculating in combustion process, forms negative pressuren zone, while its flame
Localized hyperthermia is eliminated, the temperature curve variation along kiln length is steady, can effectively inhibit the generation of nitrogen oxides, reach energy-saving ring
The effect of guarantor.
The Five-channel coal-powder combustor is based on engineering using practice for many years, with reference to coal burner both domestic and external
Service condition is burnt on the basis of the advantage and disadvantage to former four-way coal burner fully analyze using latest modern technological
The high speed difference of technology and strong eddy flow are theoretical, consider multidisciplinary grind with computer simulation technique in conjunction with Burning Behavior For Pulverized Coal
Study carefully and is developed with development result.This Five-channel coal-powder combustor is suitable for cement industry and other all kinds of rotary kilns, has one
The notable technical characterstics such as secondary wind usage ratio is low, combustion thrust is big.The outlet jet of its high speed, enhances coal dust and high temperature significantly
The mixing of Secondary Air improves coal dust firing effect, and burner firepower is strong, and flame profile is reasonable, includes smokeless to various coals quality
Coal and the colm of low heat value it is adaptable；Its structure design is exquisite, and flame regulating measure is simply applicable in, and flame profile with
When meet the needs of operating mode in kiln, be conducive to complete rational calcinating system, improve product quality；Its remarkable combustion characteristics,
It is significant to play, it improves the calcining ability of rotary kiln and improves product quality.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, people in the art
Member can as needed make the present embodiment the modification of not creative contribution after reading this specification, but as long as at this
It is all protected by Patent Law in the right of invention.
Claims (10)
1. a kind of Five-channel coal-powder combustor, including the central air hose (2) of coaxial arrangement, eddy flow airduct (3), coal air hose (4) and
Outer shaft stream air hose (5), it is characterized in that：The outer coaxial sleeve of the outer shaft stream air hose (5) is equipped with balance wind pipe (6), the balance wind pipe
(6) one end, which extends internally, is provided with flange one (61), and the flange one (61) inner wall is axially provided with along balance wind pipe (6) and cuts
Face is semicircular balance air holes (62), and balance air holes (62) circumference array is arranged in flange one (61) inner wall.
2. Five-channel coal-powder combustor according to claim 1, it is characterized in that：Outer shaft stream air hose (5) end is outside
Side, which is located at outer axis stream air passage (604) two, is provided with flange two (51), between the flange two (51) and flange one (61) there are
Gap (52).
3. Five-channel coal-powder combustor according to claim 2, it is characterized in that：The flange two (51) length is less than flange
The one end of the length of one (61), the flange one (61) and flange two (51) inside pipeline is respectively arranged with inclined-plane one
(611) and inclined-plane two (511).
4. Five-channel coal-powder combustor according to claim 1, it is characterized in that：Balance air holes (62) inner wall is along its axis
Array is provided with several flights (63).
5. Five-channel coal-powder combustor according to claim 1, it is characterized in that：Balance air holes (62) the outer end face setting
There is chamfering (621).
6. Five-channel coal-powder combustor according to claim 5, it is characterized in that：Balance wind pipe (6) outer wall is provided with
Fire resisting mud layer (17).
7. Five-channel coal-powder combustor according to claim 2, it is characterized in that：The outer shaft stream air hose (5) carries flange
The inside horizontal extension in one end of two (51) is provided with boss (9), is set along the axial array of outer shaft stream air hose (5) in the boss (9)
It is equipped with several outer shaft stream wind exhaust vents (703).
8. Five-channel coal-powder combustor according to claim 1, it is characterized in that：Central air hose (2) end set has
Cricoid centre wind nozzle (7), the central air hose (2) is interior to be coaxially arranged with spray bar (1), centre wind nozzle (7) end
The circumferentially uniformly distributed several centre wind exhaust vents (701) in face.
9. Five-channel coal-powder combustor according to claim 8, it is characterized in that：A left side for the centre wind exhaust vent (701)
Side is provided with air storing cavity (702).
10. Five-channel coal-powder combustor according to claim 8, it is characterized in that：Centre wind nozzle (7) fixed sleeves
Equipped with guide ring (8), the circumferentially uniformly distributed several spiral stream guidance slots (801) of guide ring (8) outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710246257.9A CN108730970A (en) | 2017-04-15 | 2017-04-15 | Five-channel coal-powder combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710246257.9A CN108730970A (en) | 2017-04-15 | 2017-04-15 | Five-channel coal-powder combustor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108730970A true CN108730970A (en) | 2018-11-02 |
Family
ID=63924621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710246257.9A Pending CN108730970A (en) | 2017-04-15 | 2017-04-15 | Five-channel coal-powder combustor |
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