CN202361400U - Structure of secondary air blowing pipe - Google Patents
Structure of secondary air blowing pipe Download PDFInfo
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- CN202361400U CN202361400U CN2011201883988U CN201120188398U CN202361400U CN 202361400 U CN202361400 U CN 202361400U CN 2011201883988 U CN2011201883988 U CN 2011201883988U CN 201120188398 U CN201120188398 U CN 201120188398U CN 202361400 U CN202361400 U CN 202361400U
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- Prior art keywords
- arch
- secondary wind
- face
- secondary air
- tube
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- 238000007664 blowing Methods 0.000 title 1
- 238000009826 distribution Methods 0.000 claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 17
- 239000003546 flue gas Substances 0.000 claims description 17
- 238000009827 uniform distribution Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 33
- 239000003245 coal Substances 0.000 abstract description 17
- 230000035515 penetration Effects 0.000 abstract 1
- 238000010304 firing Methods 0.000 description 24
- 239000007789 gas Substances 0.000 description 8
- 238000007599 discharging Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000470 constituent Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000004449 solid propellant Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 235000017899 Spathodea campanulata Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
一种二次风喷管结构，通过前拱或后拱或前后拱的二次风配风管道与二次风喷管相连接，二次风喷管的中心管的管道为二次风直流通道，而中心管的外壁和二次风喷管的外套管的内壁之间形成的管道为二次风旋流通道，既能保持二次风中心射流的穿透性，又能保证二次风在燃烧空间内的气流伸展性，使二次风在燃烧空间内形成了强湍动混合，具有燃烧稳定性好、煤种适应性广，既能强化燃烧和燃尽，同时，一次风和二次风合理匹配，具有降低NOx排放的多重优势。
A secondary air nozzle structure, which is connected to the secondary air nozzle through the secondary air distribution pipe of the front arch or the rear arch or the front and rear arches, and the central pipe of the secondary air nozzle is a secondary air direct flow channel , and the pipe formed between the outer wall of the central tube and the inner wall of the outer casing of the secondary air nozzle is a secondary air swirl channel, which can not only maintain the penetration of the secondary air central jet, but also ensure that the secondary air The stretchability of the airflow in the combustion space makes the secondary air form a strong turbulent mixing in the combustion space, which has good combustion stability and wide adaptability to coal types. The wind is reasonably matched and has multiple advantages of reducing NOx emissions.
Description
Technical field
The utility model relates to the boiler plant field of Thermal Power Engineering, is specifically related to a kind of secondary wind nozzle structure.
Background technology
In China; Grate firing is to use solid fuel always, such as the main combustion system of fuel such as coal, rubbish and biological substance, in the grate firing boiler; For fuel is in time ignited; Catch fire, gentle the drifting of heat in the vigorous district of must employing will burning to the measure of ignition zone, the measure of this mobile heat and air-flow be in stove, install additional chimney arch and with set up secondary wind.Before 2000 for a long time in; The capacity of China's grate firing boiler rests in the scope of middle low capacity always; Solid-fuelledly ignite, catch fire, burning and after-flame mainly relies on a wind under the fire grate, effective Gas-solid Two-phase Flow of space inner tissue and the combustion process that chimney arch is formed accomplished; Because of boiler capacity little; Solid fuel ignites at limited narrow space, catches fire, burning and after-flame, chimney arch reinforcement ignite and burning aspect brought into play main effect, secondary wind seldom is used.After 2000; Along with developing rapidly and the progressively raising of living standards of the people of national economy and society, China's central heating cause has obtained significant progress, and grate firing boiler develops towards jumbo direction gradually; 10t/h (7MW) before 2000, main force's capacity of 20t/h (14MW); Develop 100t/h (70MW), 120t/h (84MW), 130t/h (91MW) in 2009 rapidly, accomplished design in 2010, make, and installation and operation the grate firing chain grate boiler of the 165t/h of national maximum (116MW); In recent years; Because the reliability of grate firing fire grate boiler heat supplying enjoys the user to favor, big capacity layer combusting boiler, the waterpipe type hot-water boiler of particularly big capacity grate firing has obtained unprecedented development.
But grate firing fire grate boiler capacity has been brought a lot of new problems after maximizing: at first, China's grate firing furnace grate uses the diffusing coal of not screening and washing always; Ature of coal is changeable, and fine grain smalls supply ratio reaches more than 30%, although adopted layering coal supply apparatus, places coarse coal on the fire grate; Place fine particulate coal on the coarse coal, make a wind that better penetrability arranged, still; A large amount of fine grained smalls also can be risen by a wind, breaks away from grate surface, gets in the combustion space; In addition, after boiler capacity maximized, the volume calorific intensity of whole grate furnace increased; Solid fuel is dry, pyrolysis and catching fire in advance, and a large amount of fugitive constituents has little time burning on grate surface, also get in the combustion space; Fugitive constituent in the entering combustion space and fine grained smalls lack the air conditions of burning and after-flame owing to lack the combustion-supporting of air, will get into convection heating surface along with flow of flue gas; And can not get burning timely and after-flame, increased gas incomplete combustion loss and the incomplete combustion loss of flying dust solid greatly, reduced the efficiency of combustion and the thermal efficiency of grate firing boiler.
Therefore; After grate firing boiler maximizes; Grate firing boiler exists that ature of coal is changeable, fugitive constituent and flying dust lacks air-breathing, a wind is difficult to penetrate the coal seam and in time replenishes difficult problems such as air; These difficult problems are the problems that adopt chimney arch thoroughly to solve merely, cause II class bituminous coal ignite with poor combustion stability, gas incomplete combustion loss and flying dust in the generation of big, the low inferior problem of efficiency of combustion of the incomplete heat loss of solid.Therefore, grate firing boiler must install the secondary wind jet additional at correct position after maximizing, and in time replenishes air-breathing, changes the gas flowfield in the stove, makes it reach the condition of overheavy firing, after-flame; On the other hand, along with the enhancing of China environmental protection consciousness, the control of the pollutant emission of solid fuel ignition process is also progressively only controlled flue dust and SO from the past
2, develop to the direction of further control NOx discharging, during " 12 "; Country also can further strengthen the strictness control to grate firing boiler NOx discharging; If want the NOx of key-course combusting boiler to discharge, also must be achieved through in the combustion space, installing secondary wind additional, install secondary wind additional after; Can reduce the undue dependence of grate firing boiler, make grate firing boiler get into the epoch of fractional combustion control NOx discharging a wind.
The thought that in the grate firing boiler combustion space, installs secondary wind additional has very early; Secondary wind is meant that fire grate top sends into one or several bursts of strong air flow of burner hearth; Secondary wind is generally at face arch or rear arch installs additional separately and front and back arches is united and installed additional; Because the maximization of grate firing boiler; The design of simple chimney arch can not satisfy that ature of coal is changeable, overheavy firing after-flame, low NOx combustion control, improve the condition of flue gas degree of filling; The rigidity of secondary wind jet and extensibility and jet turbulence degree can not be well with rear arch flue gas leader tape to face arch and the aerodynamic field of forming rational Gas-solid Two-phase Flow and burning, therefore, secondary wind be designed to the grate furnace back key technology that maximizes.At present, China extensively adopts two " people " font arches on big capacity layer combusting boiler, and two " people " font arch is made up of " people " font face arch and " people " font rear arch; Total coverage rate is more than 70%, ignites, catches fire, burning, after-flame effect be relatively good, and it can make the high-temperature flue gas of rear arch rush at the face arch district; And the fireball of the strong rotation of formation; Make fuel gas and oxygen in the flue gas fully mix and completing combustion, thereby the temperature of face arch is improved greatly, the heat that is radiated on the new coal also strengthens; The rear arch high-temperature flue gas extend into the effect of directly igniting in face arch district, has guaranteed catching fire smoothly of new coal; The characteristics of two " people " font arch make the setting of the secondary wind simple possible that becomes; Because the intense radiation and the air-flow immixture of " people " font face arch; As long as it is arrange that at rear arch secondary wind just can realize the comprehensive adjustment effect of secondary wind, rear arch high-temperature flue gas leader tape to fire grate is anterior through secondary wind.In chain furnace, it is uneven distributing along each gas component in the fire grate direction flue gas, and the distribution character of each gas component has determined especially what of gas incomplete combustion loss of combustion position to a great extent again.Secondary wind makes fuel gas such as interior volatile matter of stove and CO realize better mixing with new fresh oxygen; And because self is to the leader tape and the propelling movement of inner flue gas of the stove; Making the interior gas flowfield of burner hearth reach predefined state fully flows; Promote to ignite, to prolong the stroke of high-temperature flue gas in burner hearth, improve gas degree of filling, control combustion centre position in the burner hearth thereby reach, prevent purposes such as local slagging scorification.
After boiler maximizes; Grate furnace is many-sided to the requirement of secondary wind, additional air is not only arranged, organize the effect of vortex movement, overheavy firing and the control NOx of flue gas, the more important thing is that the existence of secondary wind will be strengthened the further after-flame of fine grained smalls in the combustion space; Prevent flue gas layering and short circuit; Improve the full level of flue gas in stove, therefore, the secondary wind jet must have enough rigidity and extensibility simultaneously; Organize flying dust and the after-flame of fugitive constituent in the combustion space, the realization of the resultant effect of secondary wind is by the shape of the distribution of secondary air channel and overfire air jet and fluidised form decision.But in the past long time, overfire air jet all is to adopt the single tube structure, only pays attention to the rigidity of secondary wind jet; Do not pay attention to the extensibility of secondary wind; Only pay attention to " matter " of secondary wind, and do not pay attention to " amount " of secondary wind, perhaps generally; Only pay attention to the penetrability of " point " of secondary wind, and do not pay attention to the extensibility of " face " and " body " of secondary wind.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, the purpose of the utility model is to provide a kind of secondary wind nozzle structure, can keep the penetrability of secondary wind central jet; Can guarantee the air-flow extensibility of secondary wind in the combustion space again, make secondary wind in the combustion space, form the strong turbulence mixing, have that combustion stability is good, coal adaptability is wide; Can overheavy firing and after-flame; Simultaneously, wind and secondary wind rational Match have the multiple advantage that reduces the NOx discharging.
In order to achieve the above object, the technical scheme that the utility model adopted is:
A kind of secondary wind nozzle structure; Be included in the rear arch 9 of grate furnace grate furnace 101 or the top of face arch 8 or face arch 8 rear arches 9 secondary wind air distribution pipeline 1 is set; Be conducted through more than one secondary wind jet pipe 2 between secondary wind air distribution pipeline 1 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9; With this conducting secondary wind air distribution pipeline 1 and the corresponding rear arch 9 or the inner flue gas of the stove field 13 of face arch 8 or face arch 8 rear arches 9 inside; Described secondary wind jet pipe 2 inside are hollow tube 4, and the outer cover of hollow tube 4 is wound with the outer tube 3 of hollow, and hollow tube 4 is consistent with the central axis of outer tube 3; The pipeline of central tube 4 is a secondary wind direct current channel 204, and the pipeline that forms between the inwall of the outer wall of central tube 4 and outer tube 3 is a secondary wind eddy flow passage 203.
Described secondary wind eddy flow passage 203 inside along this passage circumferentially be uniform-distribution with more than three with central shaft to the fixed radial swirl vane 5 that becomes to preset angle.
The end that described outer tube 3 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9 are connected is enlarging 6, end face and enlarging 6 end face flush that central tube 4 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9 are connected.
Be conducted through more than one secondary wind jet pipe 2 through between secondary wind air distribution pipeline 1 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9; The pipeline of the central tube 4 of secondary wind jet pipe 2 is a secondary wind direct current channel 204; And the pipeline that forms between the inwall of the outer tube 3 of the outer wall of central tube 4 and secondary wind jet pipe 2 is a secondary wind eddy flow passage 203, can keep the penetrability of secondary wind central jet, can guarantee the air-flow extensibility of secondary wind in the combustion space again; Make secondary wind in the combustion space, form the strong turbulence mixing; Have that combustion stability is good, coal adaptability is wide, can overheavy firing and after-flame, simultaneously; Wind and secondary wind rational Match have the multiple advantage that reduces the NOx discharging.
Description of drawings
Fig. 1 is the operation principle side direction structural representation of the utility model.
Fig. 2 is the structural representation of the utility model.
Fig. 3 is the connection sketch map of the utility model with secondary wind air distribution pipeline.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is done more detailed explanation.
As shown in Figure 1; On the traveling-grate stoker 10 that has a wind air supply duct 11 below the grate furnace grate furnace 101, form inner flue gas of the stove field 13 by the face arch that has coal bunker 12 8, rear arch 9, and described secondary wind nozzle structure; As shown in Figures 2 and 3; The secondary wind nozzle structure is included in the rear arch 9 of grate furnace grate furnace 101 or the top of face arch 8 or face arch 8 rear arches 9 secondary wind air distribution pipeline 1 is set, and is conducted through more than one secondary wind jet pipe 2 between secondary wind air distribution pipeline 1 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9; With this conducting secondary wind air distribution pipeline 1 and the corresponding rear arch 9 or the inner flue gas of the stove field 13 of face arch 8 or face arch 8 rear arches 9 inside; Described secondary wind jet pipe 2 inside are hollow tube 4, and the outer cover of hollow tube 4 is wound with the outer tube 3 of hollow, and hollow tube 4 is consistent with the central axis of outer tube 3; The pipeline of central tube 4 is a secondary wind direct current channel 204, and the pipeline that forms between the inwall of the outer wall of central tube 4 and outer tube 3 is a secondary wind eddy flow passage 203.Described secondary wind eddy flow passage 203 inside along this passage circumferentially be uniform-distribution with more than three with central shaft to the fixed radial swirl vane 5 that becomes to preset angle.The end that described outer tube 3 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9 are connected is enlarging 6, end face and enlarging 6 end face flush that central tube 4 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9 are connected.
The operation principle of the utility model is: secondary wind is drawn from 201 distribution of secondary wind air distribution pipe outlet; Get into secondary wind jet pipe 2; A secondary wind part that gets into secondary wind jet pipe 2 gets into secondary wind direct current channel 204, and a part gets into secondary wind eddy flow passage 203, and secondary wind penetrates with the end face that is connected with corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9 from enlarging 6 and central tube 4; The center is a direct current, and the outside is an eddy flow.
Be conducted with more than one secondary wind jet pipe 2 through between secondary wind air distribution pipeline 1 and corresponding rear arch 9 or face arch 8 or face arch 8 rear arches 9; The pipeline of the central tube 4 of secondary wind jet pipe 2 is a secondary wind direct current channel 204; And the pipeline that forms between the inwall of the outer tube 3 of the outer wall of central tube 4 and secondary wind jet pipe 2 is a secondary wind eddy flow passage 203, can keep the penetrability of secondary wind central jet, can guarantee the air-flow extensibility of secondary wind in the combustion space again; Make secondary wind in the combustion space, form the strong turbulence mixing; Have that combustion stability is good, coal adaptability is wide, can overheavy firing and after-flame, simultaneously; Wind and secondary wind rational Match have the multiple advantage that reduces the NOx discharging.
Claims (3)
1. secondary wind nozzle structure; Be included in the rear arch (9) of grate furnace grate furnace (101) or the top of face arch (8) or face arch (8) rear arch (9) secondary wind air distribution pipeline (1) is set; It is characterized in that: be conducted through more than one secondary wind jet pipe (2) between secondary wind air distribution pipeline (1) and corresponding rear arch (9) or face arch (8) or face arch (8) rear arch (9); With this conducting secondary wind air distribution pipeline (1) and corresponding rear arch (9) or face arch (8) or the inner inner flue gas of the stove field (13) of face arch (8) rear arch (9); Described secondary wind jet pipe (2) inside is hollow tube (4); The outer cover of hollow tube (4) is wound with the outer tube (3) of hollow; Hollow tube (4) is consistent with the central axis of outer tube (3), and the pipeline of central tube (4) is secondary wind direct current channel (204), and the pipeline that forms between the inwall of the outer wall of central tube (4) and outer tube (3) is a secondary wind eddy flow passage (203).
2. secondary wind nozzle structure according to claim 1 is characterized in that: described secondary wind eddy flow passage (203) inner along this passage circumferentially be uniform-distribution with more than three with central shaft to the fixed radial swirl vane (5) that becomes to preset angle.
3. described according to claim 1 or the described secondary wind nozzle structure of claim 2; It is characterized in that: the end that described outer tube (3) and corresponding rear arch (9) or face arch (8) or face arch (8) rear arch (9) are connected is enlarging (6), end face and enlarging (6) end face flush that central tube (4) and corresponding rear arch (9) or face arch (8) or face arch (8) rear arch (9) are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201883988U CN202361400U (en) | 2011-06-08 | 2011-06-08 | Structure of secondary air blowing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201883988U CN202361400U (en) | 2011-06-08 | 2011-06-08 | Structure of secondary air blowing pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202361400U true CN202361400U (en) | 2012-08-01 |
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ID=46572584
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201883988U Expired - Fee Related CN202361400U (en) | 2011-06-08 | 2011-06-08 | Structure of secondary air blowing pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN202361400U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148501A (en) * | 2013-03-14 | 2013-06-12 | 福建绿源新能源科技有限公司 | Secondary air structure for boiler burning biomass formed fuel |
-
2011
- 2011-06-08 CN CN2011201883988U patent/CN202361400U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148501A (en) * | 2013-03-14 | 2013-06-12 | 福建绿源新能源科技有限公司 | Secondary air structure for boiler burning biomass formed fuel |
| CN103148501B (en) * | 2013-03-14 | 2015-05-13 | 福建绿源新能源科技有限公司 | Secondary air structure for boiler burning biomass formed fuel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20150608 |
|
| EXPY | Termination of patent right or utility model |