CN102913902B - Internal-combustion multi-passage low-nitrogen burner - Google Patents
Internal-combustion multi-passage low-nitrogen burner Download PDFInfo
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- CN102913902B CN102913902B CN201210433425.2A CN201210433425A CN102913902B CN 102913902 B CN102913902 B CN 102913902B CN 201210433425 A CN201210433425 A CN 201210433425A CN 102913902 B CN102913902 B CN 102913902B
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Abstract
The invention provides an internal-combustion multi-passage low-nitrogen burner. The burner comprises a plurality of straight-flow air passages which are sequentially distributed in the wall of a shell in an annular shape, a whirl air passage and a main pulverized coal passage, wherein a reduced nozzle is arranged at the outlet of each straight flow air passage; a low resistance value whirl vane is arranged at the outlet of the whirl air passage; a plurality of turbulent blocks which are distributed along the circumference are arranged at the outlet of the main pulverized coal passage; an internal-combustion ignition passage is formed in the middle of the shell; an igniter capable of moving back and forth is arranged at the inlet of the internal-combustion ignition passage, a strong reflux standing entrainment device is arranged in the middle of the internal-combustion ignition passage; a preheat section is arranged between the strong reflux standing entrainment device and the igniter, and a reinforced combustion section is arranged between the strong reflux standing entrainment device and the internal-combustion ignition passage; the strong reflux standing entrainment device is provided with a reduced sleeve, and a plurality of through holes are formed on the circumference of the outer wall at the inlet of the reduced sleeve. The internal-combustion multi-passage low-nitrogen burner is applicable to internal-combustion multi-passage low-nitrogen burners of various rotary kilns, is compact and simple in whole structure, and can save the maintenance cost as quick-wear parts can be easily detached and replaced.
Description
Technical field
The present invention relates to a kind of low NO, especially a kind of internal combustion type that is applicable to cement industry, metallurgical and chemical industry and glass industry multichannel low NO of holding concurrently.
Background technology
The resource-integrated industry that cement industry is the energy, ore resource consumption is large, is subject to again the serious restriction of inadequate resource, environmental pollution simultaneously.The cement rotary kiln multi-channel coal powder combustor that the mid-1970s grows up in the world, a wind consumption that makes kiln drops to 12%～15% by traditional 20%～30%, simultaneously the operation of kiln and clinker burning situation be improved significantly.Through the technological progress of more than 20 years, the once clean wind consumption of kiln was reduced to 6%～8% at present, has greatly improved efficiency of combustion and the thermal efficiency of kiln.But during cement furnace igniting, adopt large capacity oil gun by more than burner hearth heating or maintaining coal-fired ignition temperature, by coal burner, in stove, drop into coal dust firing more afterwards, need to consume a large amount of fuel oils.
Through research for many years, fuel-economizing firing technique has also had certain application in cement rotary kiln, for example the patent No. is the disclosed a kind of fuel-economizing coal powder burner that is applied to cement kiln of ZL200720155544.0, utilize under original multicenter combustor or below left and right sides, set up one and start the oil-saving burner that stove is used, substitute and use large capacity grease gun igniting, reach the object of fuel-economizing.But the problem that this patent exists is: 1) ignition system more complicated, has increased the cost of operation, maintenance; 2) be not suitable with the sparking mode of present cement kiln " edge point oil edge point coal ", do not reach good energy-saving effect; 3) oil-saving burner of setting up and original multicenter combustor cannot well cooperatively interact, and when burning condition is severe, there will be fire extinguishing phenomenon.
Application number is 200910175070.X, and disclosed a kind of coal burner and control method thereof are to utilize leading screw or cylinder to drive described igniter and coal wind duct to be axially synchronized with the movement, and form an internal combustion cylinder; Control igniter and in internal combustion cylinder, light the coal dust of described coal wind duct projection.This mode exists: 1) do not form the entrainment block of a coal dust, be unfavorable for lighting of coal dust; 2) because igniter and coal wind duct form an internal combustion cylinder, burner by ignition process in load up process, be not easy to realize, and running time is longer.
Summary of the invention
Technical problem: the object of the invention is for the problem existing in prior art, a kind of internal combustion type multichannel low NO of holding concurrently is provided, the start-up course of rotary kiln is divided into igniting and two stages of load up, thereby use the oil mass of former large oil gun 1/10th to get final product firing coal-dust, save great amount of fuel oil.
Technical scheme: the internal combustion type of the present invention multichannel low NO of holding concurrently, comprise housing, on housing wall, have successively a plurality of direct current wind passages, eddy flow wind passage and the main coal dust passage that circularize distribution, the exit of direct current wind passage is undergauge spout, and the exit of eddy flow wind passage is provided with low resistance swirl vane; The exit of main coal dust passage is provided with a plurality of flow-disturbing blocks that are uniformly distributed along the circumference, housing middle part is internal combustion ignition channel, the porch of internal combustion ignition channel is provided with the igniter that can move forward and backward, the middle part of internal combustion ignition channel is provided with strong inverse flow and entrainments device in nest, it is preheating section that strong inverse flow entrainments between device and igniter in nest, and it is overheavy firing section that strong inverse flow entrainments between device and the outlet of internal combustion ignition channel in nest; It is a reducing casing that described strong inverse flow entrainments device in nest, on the entrance outer wall circumference of reducing casing, has a plurality of through holes.
The undergauge spout of described direct current wind channel exit setting is the tapered spout of segmentation; Described undergauge spout is relative centralized arrangement between two along the circumferential direction, relatively concentrate center of circle angle between two holes be between relative separation two holes angle 1/2 ~ 2/3; Between described direct current wind passage and eddy flow wind passage, be provided with a dividing wall that can move forward and backward; Described flow-disturbing block is square, arch or arc; The angle at the elevation angle, windward side of described flow-disturbing block is 5 ~ 10 °; Described flow-disturbing block is fixed through screw or pin; Described strong inverse flow entrainments device outer end root in nest, along even circumferential, a plurality of anti-coking clean-out hatch is set, and the angle at a plurality of anti-coking clean-out hatch interval is 15 ~ 45 °, and aperture is 5 ~ 10mm.
Beneficial effect: the present invention adopts the mode that internal combustion ignition technology, low nitrogen burning technology and multichannel combustion technology are combined, is divided into igniting and two stages of load up by the start-up course of rotary kiln.Ignition phase utilizes internal combustion ignition technology, uses the oil mass of former large oil gun 1/10th to get final product firing coal-dust, saves great amount of fuel oil.The load up stage is utilized low nitrogen burning technology and multichannel combustion technology, guarantees the adaptive while of pulverized coal flame to rotary kiln, takes into account the richness combustion characteristic of flame, reduces the generation of nitrogen oxide.Realize high rate of economizing gasoline and high burn-off rate, reduced the generation of nitrogen oxide simultaneously, compact overall structure, simple, consumable accessory is detachably changed, and saves maintenance cost, has practicality widely.
Accompanying drawing explanation
Fig. 1 is the hold concurrently main TV structure schematic diagram of multichannel low NO of internal combustion type of the present invention;
Fig. 2 is the hold concurrently right TV structure schematic diagram of multichannel low NO of internal combustion type of the present invention;
Fig. 3 is internal combustion type of the present invention weak eddy flow wind dividing wall structure one schematic diagram of multichannel low NO of holding concurrently;
Fig. 4 is the internal combustion type of the present invention strong eddy flow wind of multichannel low NO dividing wall structure two schematic diagrames of holding concurrently.
In figure: 1-direct current wind passage, 2-eddy flow wind passage, the main coal dust passage of 3-, 4-igniter, 5-ignition channel preheating section, 6-strong inverse flow is stayed nest and is entrainmented device, 7-ignition channel outer wall, 8-swirl vane, 9-dividing wall, the main coal dust channel outer wall of 10-low speed, 11-undergauge spout, 12-flow-disturbing block, 13-ignition channel overheavy firing section, 14-internal combustion ignition channel
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described:
As depicted in figs. 1 and 2, the internal combustion type of the present invention multichannel low NO of holding concurrently, comprise housing, on housing wall, ecto-entad has a plurality of direct current wind passages 1 that circularize distribution successively, eddy flow wind passage 2 and main coal dust passage 3, the front end exit place of direct current wind passage 1 is undergauge spout 11, undergauge spout 11 is the tapered spout of segmentation, the exit of direct current wind passage 1 is provided with along the circumferential direction the relative tapered undergauge spout 11 of centralized arrangement segmentation between two, to obtain best pressure-speed ability, wherein relatively concentrate angle between two holes be between relative separation two holes angle 1/2 ~ 2/3, the front end exit place of eddy flow wind passage 2 is provided with low resistance swirl vane 8, to obtain best pressure-eddy flow degree performance, between described direct current wind passage 1 and eddy flow wind passage 2, be provided with a dividing wall that can move forward and backward 9, the dividing wall 9 in shown in Fig. 3 stretches out passage outside, and dividing wall 9 contractings shown in Fig. 4 are in passage.The front end exit place of main coal dust passage 3 is provided with to be uniformly distributed along the circumference and is fixed with dismountable a plurality of flow-disturbing block 12 through screw, be beneficial to partial transformation, to obtain best stabilizing the flame and local shading effect, flow-disturbing block 12 is square, arch or arc, the elevation angle, windward side of stream block 12 is less angle, to reduce the wearing and tearing of wind powder air-flow to flow-disturbing block 12, preferably the angle at the elevation angle, windward side is 5 ~ 10 °; Housing middle part is internal combustion ignition channel 14, and the porch of internal combustion ignition channel 14 is provided with the igniter 4 that can move forward and backward, and when fuel is anthracite, high temperature dot burning things which may cause a fire disaster 4 distances are accelerated shower nozzle 11 longer distance is set, and preferred distance L is 2.5 ~ 4m; When fuel is bituminous coal, high temperature dot burning things which may cause a fire disaster 4 distances are accelerated spout 11 shorter distance L are set, and preferred distance L is 1 ~ 2.5m.The middle part of internal combustion ignition channel 14 is provided with strong inverse flow and entrainments device 6 in nest, and it is a reducing casing that described strong inverse flow entrainments device 6 in nest, on the entrance outer wall circumference of reducing casing, has a plurality of through holes; Strong inverse flow is stayed the different numerical value of effective depth H based on fuel different designs that nest entrainments device 6, and when fuel is anthracite, preferred H value is 120 ~ 180mm; When fuel is bituminous coal, preferred H value is 50 ~ 120mm.Strong inverse flow entrainments device 6 outer end roots in nest, along even circumferential, a plurality of circumferential anti-coking clean-out hatch 7 is set, and the angle at a plurality of anti-coking clean-out hatch 7 intervals is 15 ~ 45 °, and aperture is 5 ~ 10mm.It is preheating section 5 that strong inverse flow entrainments between device 6 and igniter 4 in nest, and it is overheavy firing section 13 that strong inverse flow entrainments between device 6 and the outlet of internal combustion ignition channel in nest.
Operation principle and the course of work: the wind through swirl vane 8 is eddy flow wind, wind through gap between dividing wall 9 and swirl vane 8 is direct current wind, dividing wall 9 moves to accelerating spout 11 directions, between swirl vane 8 and dividing wall 9, gap increases, direct current wind share increases, and causes integral cyclone weakened; Dividing wall 9 moves round about, and between swirl vane 8 and dividing wall 9, gap reduces, and direct current wind share reduces, and causes integral cyclone intensity grow; Dividing wall 9 moves to extreme position and overlaps with swirl vane 8 outer ends, and direct current wind share is zero, and now integral cyclone intensity is maximum.
Ignition phase, is inserted into the internal combustion type multichannel low NO of holding concurrently in rotary kiln, and high temperature dot burning things which may cause a fire disaster 4 is advanced to suitable position, guarantees the length of ignition channel preheating section 5.In main coal dust passage 3, pass into coal dust wind, through high temperature dot burning things which may cause a fire disaster 4, ignite, through ignition channel preheating section 5, strong inverse flow, stay that nest entrainments device 6 and ignition channel overheavy firing section 13 is carried out overheavy firing.Meanwhile, in the main coal dust passage 3 of middling speed eddy flow wind passage 2 and low speed, pass into clean wind, guarantee the rear completing combustion of main coal dust passage 3 fuel ejection.
In the load up stage, according to the heating curve of rotary kiln, pass into coal dust wind in the main coal dust passage 3 of low speed, and meanwhile, High-speed DC wind passage 1 and the 2 interior ventilations of middling speed eddy flow wind passage, along with passing into the variation of coal dust amount in the main coal dust passage 3 of low speed, adjust the size of air quantity.When kiln temperature is elevated to after feed temperature, start to feed intake, while waiting rotary kiln secondary air temperature to reach technological requirement, first stop high temperature dot burning things which may cause a fire disaster 4, then it is interior for coal dust to stop main coal dust passage 3, rotary kiln enters normal operation.
Fig. 3 and Fig. 4 are the position views of internal combustion type dividing wall while holding concurrently multichannel low NO integral cyclone weakened and grow, between High-speed DC wind passage 1 and middling speed eddy flow wind passage 2, a dividing wall that can move forward and backward 9 is set, wind through swirl vane 8 is eddy flow wind, wind through gap between dividing wall 9 and swirl vane 8 is direct current wind, the movement of dividing wall 9 can change the gap of swirl vane 8 and dividing wall 9, decide the power of integral cyclone intensity, being specially dividing wall 9 moves to accelerating shower nozzle 11 directions, between swirl vane 8 and dividing wall 9, gap increases, direct current wind share increases, cause integral cyclone weakened, dividing wall 9 position now as shown in Figure 3, dividing wall 9 moves round about, and between swirl vane 8 and dividing wall 9, gap reduces, and direct current wind share reduces, and causes integral cyclone intensity grow, and dividing wall 9 position now as shown in Figure 4, dividing wall 9 moves to extreme position and overlaps with swirl vane 8 outer ends, and direct current wind share is zero, and now integral cyclone intensity is maximum.
Claims (8)
1. the internal combustion type multichannel low NO of holding concurrently, it is characterized in that: it comprises housing, on housing wall, have successively a plurality of direct current wind passages (1), eddy flow wind passage (2) and the main coal dust passage (3) that circularize distribution, the exit of direct current wind passage (1) is undergauge spout (11), and the exit of eddy flow wind passage (2) is provided with low resistance swirl vane (8); The exit of main coal dust passage (3) is provided with a plurality of flow-disturbing blocks (12) that are uniformly distributed along the circumference, housing middle part is internal combustion ignition channel (14), the porch of internal combustion ignition channel (14) is provided with the igniter (4) that can move forward and backward, the middle part of internal combustion ignition channel (14) is provided with strong inverse flow and entrainments device (6) in nest, it is preheating section (5) that strong inverse flow entrainments between device (6) and igniter (4) in nest, and it is overheavy firing section (13) that strong inverse flow entrainments between device (6) and the outlet of internal combustion ignition channel in nest; It is a reducing casing that described strong inverse flow entrainments device (6) in nest, on the entrance outer wall circumference of reducing casing, has a plurality of through holes.
2. the internal combustion type according to claim 1 multichannel low NO of holding concurrently, is characterized in that: the undergauge spout (11) that described direct current wind passage (1) exit arranges is the tapered spout of segmentation.
3. according to the multichannel low NO of holding concurrently of internal combustion type described in claim 1 or 2, it is characterized in that: described undergauge spout (11) is relative centralized arrangement between two along the circumferential direction, relatively concentrate center of circle angle between two holes be between relative separation two holes angle 1/2 ~ 2/3.
4. the internal combustion type according to claim 1 multichannel low NO of holding concurrently, is characterized in that: between described direct current wind passage (1) and eddy flow wind passage (2), be provided with a dividing wall that can move forward and backward (9).
5. the internal combustion type according to claim 1 multichannel low NO of holding concurrently, is characterized in that: described flow-disturbing block (12) is square, arch or arc.
6. the internal combustion type multichannel low NO of holding concurrently according to claim 1 or 5, is characterized in that: the angle at the elevation angle, windward side of described flow-disturbing block (12) is 5 ~ 10 °.
7. the internal combustion type multichannel low NO of holding concurrently according to claim 1 or 5, is characterized in that: described flow-disturbing block (12) is fixed through screw or pin.
8. the internal combustion type according to claim 1 multichannel low NO of holding concurrently, it is characterized in that: described strong inverse flow entrainments device (6) outer end root in nest, along even circumferential, a plurality of anti-coking clean-out hatch (7) is set, the angle at a plurality of anti-coking clean-out hatch (7) interval is 15 ~ 45 °, and aperture is 5 ~ 10mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210433425.2A CN102913902B (en) | 2012-11-05 | 2012-11-05 | Internal-combustion multi-passage low-nitrogen burner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210433425.2A CN102913902B (en) | 2012-11-05 | 2012-11-05 | Internal-combustion multi-passage low-nitrogen burner |
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| CN102913902A CN102913902A (en) | 2013-02-06 |
| CN102913902B true CN102913902B (en) | 2014-12-10 |
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| CN201210433425.2A Active CN102913902B (en) | 2012-11-05 | 2012-11-05 | Internal-combustion multi-passage low-nitrogen burner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101773297B1 (en) * | 2016-05-24 | 2017-08-30 | 두산중공업 주식회사 | Nozzle tip of pulverized coal burner |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU690241A1 (en) * | 1976-12-13 | 1979-10-05 | Производственное Объединение По Наладке, Совершенствованию Технологии И Эксплуатации Электростанций И Сетей | Powder-coal burner |
| JPS59500482A (en) * | 1982-02-17 | 1984-03-22 | コルテング・ハノバ− アクチエン・ゲゼルシヤフト | burner |
| CN201062792Y (en) * | 2007-07-06 | 2008-05-21 | 烟台龙源电力技术股份有限公司 | Oil-coal dust combustion apparatus for cement kiln furnace |
| CN102032562A (en) * | 2009-09-27 | 2011-04-27 | 烟台龙源电力技术股份有限公司 | Powdered coal burner and control method thereof, rotary kiln using the same |
| CN202938290U (en) * | 2012-11-05 | 2013-05-15 | 徐州燃控科技股份有限公司 | Internal combustion and multi-channel low-nitrogen combustor |
-
2012
- 2012-11-05 CN CN201210433425.2A patent/CN102913902B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU690241A1 (en) * | 1976-12-13 | 1979-10-05 | Производственное Объединение По Наладке, Совершенствованию Технологии И Эксплуатации Электростанций И Сетей | Powder-coal burner |
| JPS59500482A (en) * | 1982-02-17 | 1984-03-22 | コルテング・ハノバ− アクチエン・ゲゼルシヤフト | burner |
| CN201062792Y (en) * | 2007-07-06 | 2008-05-21 | 烟台龙源电力技术股份有限公司 | Oil-coal dust combustion apparatus for cement kiln furnace |
| CN102032562A (en) * | 2009-09-27 | 2011-04-27 | 烟台龙源电力技术股份有限公司 | Powdered coal burner and control method thereof, rotary kiln using the same |
| CN202938290U (en) * | 2012-11-05 | 2013-05-15 | 徐州燃控科技股份有限公司 | Internal combustion and multi-channel low-nitrogen combustor |
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Address after: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China Patentee after: XUZHOU KERONG ENVIRONMENTAL RESOURCES CO., LTD. Address before: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China Patentee before: Xuzhou Combustion Control Research Institute Co., Ltd. |
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Effective date of registration: 20200414 Address after: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China Patentee after: XUZHOU COMBUSTION CONTROL RESEARCH INSTITUTE Co.,Ltd. Address before: 221004 No. 12 Yang Shan Road, Xuzhou Economic Development Zone, Jiangsu, China Patentee before: XUZHOU KERONG ENVIRONMENTAL RESOURCES Co.,Ltd. |