CN1279313C - Circularly shirl coal powder burn device with various concentration coal powder pipe - Google Patents
Circularly shirl coal powder burn device with various concentration coal powder pipe Download PDFInfo
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- CN1279313C CN1279313C CN 200410009535 CN200410009535A CN1279313C CN 1279313 C CN1279313 C CN 1279313C CN 200410009535 CN200410009535 CN 200410009535 CN 200410009535 A CN200410009535 A CN 200410009535A CN 1279313 C CN1279313 C CN 1279313C
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- secondary air
- air channel
- coal
- pulverized coal
- pipe
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Abstract
The present invention relates to a circular vortex concentration pulverized coal combustor, particularly to a vortex pulverized coal combustion device. A separator plate which divides a primary air pipe into an upper thick pulverized coal pipeline and a lower thin pulverized coal pipeline is arranged in a primary air pulverized coal pipe, a reducing pipe used for evening pulverized coal air flows is arranged in a thick pulverized coal pipeline, a wedge-shaped body is formed between the bottom of the reducing pipe and the separator plate. A fixed swirl blade is arranged in the thin pulverized coal pipeline of the lower part of the primary air pipe, a movable adjustable swirl blade is arranged in a secondary air pipe, and a rotary body with a curved groove on the inner surface is arranged on the wall surface of the front end of the swirl blade of the secondary air pipe. The present invention can effectively lower the NO<x> discharge of pulverized coal fired boilers, and the carbon content of fly ash can not be increased obviously. Meanwhile, when pulverized coal with low volatile matter is combusted, and the problems of low-load ignition and stable combustion and the reduction of the resistance and the abrasion of the primary air pipe are effectively solved. Thereby, the service life of combustion devices is extended, and the performance cost of devices is increased.
Description
Technical field
The present invention relates to a kind of boiler coal-ash combustion apparatus, particularly a kind of eddy flow concentration coal burner.
Background technology:
Using the vortex burner of arranging that liquidates in the market mainly contains: two radially concentration coal burners of transferring wind coal burner, Harbin Institute of Technology of Beijing Ba Wei company etc.
The primary structure of two accent wind coal burners of Beijing Ba Wei company is circular version, is airduct, interior secondary air channel and an outer secondary air channel from inside to outside successively.Swirl vane is all arranged in the inside and outside secondary air channel; Do not have central tube in the airduct, oil gun is arranged in the secondary air channel, the upside of an airduct.The advantage of this structure is: do not have pipeline in the airduct, reduced the wearing and tearing of coal dust to pipeline; The effect of two-layer swirl vane easily produces very big swirl strength.Shortcoming is: one time airduct spout place does not have bluff body, is unfavorable for being formed with the recirculating zone that is beneficial to the nearly wall place that catches fire; The cyclonic action of outer secondary wind makes nearly wall place be difficult to keep oxidizing atmosphere, is unfavorable for preventing high temperature corrosion and slagging scorification; One time the wind breeze airflow does not have deep or light separation, and catching fire of anthracite that catches fire for difficulty etc. is unfavorable.The innovative product of the another kind of burner of the said firm is " two wind combustors of transferring of bleeder ", this structure is that the thin powdered coal air-flow with an airduct center (accounts for 50% of primary air flow, wherein contain 10% the coal dust of having an appointment) sucking-off, send in lower furnace portion, form the deep or light separation of coal dust.The effect that only depends on pressure reduction in the pulverized coal channel to reach the isolated at suction of thin powdered coal air-flow in this structure is not fine, and because the temperature of lower of burner region is lower, and coal powder density is lower, and the ignition point of coal dust is higher, make coal dust particularly the completing combustion of low-volatile coal dust be affected.
The structure of " the radially concentration coal burner " that uses in the prior art also is circular, is airduct, interior secondary air channel and an outer secondary air channel from inside to outside successively.Be furnished with fixing swirl vane in the interior secondary air channel; Outer secondary air channel on-bladed provides direct current wind; Be furnished with band oil gun central tube in the airduct, be furnished with louver pulverized coal concentrator in the annular coal dust passage between airduct and the central tube, realize the deep or light separation of coal dust.Its advantage is the existence of the outer secondary wind of direct current, makes the furnace wall cooling side be easy to form the oxidizing atmosphere of oxygen enrichment; Thick coal culm is interior, and thin powdered coal burns in the outside, helps catching fire and burning of coal dust, and the existence of central tube spout reamer is formed with and is beneficial to the recirculating zone that catches fire; But conversely, the coal dust wear problem of central tube is very big, and replace tubes is frequent; Stifled powder phenomenon takes place in the version of louver pulverized coal concentrator easily when load variations is big simultaneously; And fix the angle that interior secondary air blade is unfavorable for adjusting with the variation of load blade, produce suitable swirl strength.
Characteristics at environmental requirement and former coal reserves, particularly along with the minimizing of former coal reserves, ature of coal also becomes worse and worse, most of power industry and industrial coal adopt low-volatile coal more, as meager coal and anthracite etc., their burning feature is the content of fugitive constituent considerably less relatively (Vdaf＜20%), thereby its difficulty of catching fire, steady combustion are also difficult, and burn more difficult.Along with NO in the world wide
xThe control criterion of discharging also more and more higher, a kind of suitable low-volatile coal dust burning of R and D, low NO
xDischarging has significant practical significance with efficient steady combustion to the stamp vortex burner.
Summary of the invention
At the deficiencies in the prior art and defective, the purpose of this invention is to provide a kind of circular cyclone concentration coal burner, make it when burning low-volatile coal dust, solve the problem that underload catches fire and surely fire, further reduce NO
xGeneration, reduce the resistance and the wearing and tearing of an airduct.
Technical scheme of the present invention is as follows:
A kind of circular cyclone concentration coal burner, contain a wind coal pipe being with elbow, be successively set on wind coal pipe outside and interior secondary air channel of eddy flow that install with one heart and the outer secondary air channel of direct current one time, in described, be furnished with swirl vane and torch oil gun in the secondary air channel, it is characterized in that: a dividing plate is set in the centre of the elbow front end of a wind coal pipe airduct is divided into bias pulverized coal pipeline up and down, described dividing plate is made of straight plate and downward-sloping swash plate, is furnished with aperture at the rear end part of this straight plate; A sleeve that is used for even breeze airflow is set in the thick coal culm pipeline on described top, and this sleeve is made up of converging transition, straight section and divergent segment, forms sphenoid between the bottom of sleeve and the described dividing plate; In the thin powdered coal pipeline of the bottom of a described airduct, fixing swirl vane is set; In described, be furnished with the rotary body of inner surface belt curve conduit on the wall of the front end of the swirl vane of secondary air channel.
Technical characterictic of the present invention also is: the adjustable swirl vane of swirl vane employing activity of secondary air channel in described.
Another technical characterictic of the present invention is: the height of described curve conduit is 20～50 millimeters, and the tangent line of curve conduit and rotary body is at 45.
Another technical characterictic of the present invention is: the angle of described each air channel enlarging is at 15～18 °; The outer secondary air channel of secondary air channel and direct current is connected with independent bellows respectively in described; Described torch oil gun (2) with 2～5 ° downward inclination angle oblique be arranged in secondary air channel directly over.
The present invention compared with prior art, have the following advantages and the high-lighting effect: 1. the present invention utilizes the separation dividing plate in airduct and the acting in conjunction of thick coal culm pipe to form a sphenoid in the exit of burner, set up and helped forming the suitable recirculating zone that breeze airflow is in time caught fire, guaranteed coal dust, particularly the stability of catching fire and burning of low-volatile coal dust.2. burner of the present invention has the modulability of bigger fuel tolerance and load.When load variations, can be earlier by separately independently bellows structure (primary air fan, inside and outside secondary air box) come the required separately air quantity of coarse adjustment; Secondly, the angle of the adjustable vane of secondary wind changes swirl strength in can regulating; And again owing to the existence of fixing surface of revolution wedge, the direct current finning of air-flow when having avoided underload has solved underload flame holding problem, causes stopping working when serious.3. burner of the present invention does not have central tube owing to the elbow, thereby has reduced the generation of wearing and tearing, can effectively reduce the light maintenance number of times of boiler, has improved reliability of operation.
In sum, the present invention adopts at the spout place of an airduct and forms bluff body, and do not have the arrangement of any pipeline in the elbow, be unfavorable for being formed with the erosive wear problem of the breeze airflow of elbow when being beneficial to the recirculating zone that catches fire and central tube being arranged when having avoided no central tube to central tube; Utilize the inertial separation of elbow and acting in conjunction formation the deep or light of coal dust of skimming baffle to separate, form thick coal culm and catch fire earlier, light the combustion system of thin powdered coal then, help reducing ignition heat, reduce total flame temperature level, reduce NO
xGeneration, simultaneously the deep or light isolating construction of this coal dust can not increase the resistance in the wind coal pipe one time; The existence of the sphenoid of the band curve runner of the front end of the movable vane of interior secondary air channel, when having avoided underload in the direct current finning of secondary air channel spout place air-flow, solved the flame holding problem of underload.
Description of drawings
Fig. 1 is the structural representation of circular cyclone concentration coal burner provided by the invention.
Fig. 2 is the right view of Fig. 1.
Fig. 3 is the front view that is arranged on a skimming baffle in the wind coal pipe.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 is the front view that is arranged on the ducted reducing pipe of thick coal culm.
Fig. 6 is the front view of the rotary body of band curve conduit.
Fig. 7 is the right view of Fig. 6.
Among the figure: 1. wind pulverized coal channel; 2. torch oil gun; 3. burner thermal baffle; 4. the outer secondary air channel of direct current; 5. secondary air channel in the eddy flow; 6. wind coal pipe spout; 7. reducing pipe; 8. thin powdered coal pipe; 9. the ducted fixedly swirl vane of thin powdered coal; 10. the movable adjustable swirl vane in the interior secondary air channel; 11. the rotary body of the band curve runner in the interior secondary air channel; 12. the adjusting yoke of blade in the interior secondary air channel; 13. curve runner; 14. separation dividing plate; 15. wind pulverized coal channel elbow.
The specific embodiment
Further specify structure of the present invention, operation principle and most preferred embodiment below in conjunction with accompanying drawing.
Fig. 1,2 is the general structure schematic diagram of circular cyclone concentration coal burner provided by the invention.This burner contains a wind coal pipe 1 being with elbow 15, be successively set on wind coal pipe outside and interior secondary air channel 5 of eddy flow that install with one heart and the outer secondary air channel 4 of direct current one time, swirl vane 10 and the torch oil gun 2 of in described, be furnished with adjusting yoke 12 in the secondary air channel 5, regulating; Be provided with one and separate dividing plate 14 airduct is divided into bias pulverized coal pipeline up and down in a wind coal pipe, described separation dividing plate is made of straight plate and downward-sloping swash plate, is furnished with aperture at the rear end part of this straight plate; A reducing pipe 7 that is used for even breeze airflow is set in the thick coal culm pipeline on an airduct top, and this reducing pipe is made up of converging transition, straight section and divergent segment, and the bottom of reducing pipe forms sphenoid with described the separation between the dividing plate; In the thin powdered coal pipeline 8 of the bottom of a described wind coal pipe 1, fixing swirl vane 9 is set; Circular enlarging 6 is arranged in the exit of bias pulverized coal pipe; Be furnished with the rotary body 11 of its inner surface belt curve conduit 13 on the wall of the front end of the swirl vane 10 of interior secondary air channel.Above-mentioned each structure is connected by the thermal baffle 3 of burner, and is fixed on the boiler water wall.
Fig. 3,4 is front view and vertical view figure of an interior separation dividing plate 14 that is provided with of wind coal pipe.This separation dividing plate 14 is divided into bias pulverized coal pipeline up and down with wind coal pipe, and it is made of straight plate and downward-sloping swash plate, is furnished with aperture at the rear end part of this straight plate.The diameter of this aperture is 10～20 millimeters, its effect is the pressure that utilizes the elbow air-flow, make through the centrifugal action of elbow 15 and the part air penetration in the breeze airflow of elementary denseization in the thin powdered coal pipeline, further improve the ducted coal powder density of thick coal culm; The gradient of downward-sloping swash plate is 5～10 °, make the thin powdered coal air-flow below the swash plate depart from the center, and deflection is downward, prolongs the incorporation time with the thick coal culm air-flow.
Fig. 5 is a structural representation that is used for the reducing pipe 7 of even breeze airflow that is provided with in the thick coal culm pipeline.This reducing pipe 7 is made up of converging transition, straight section and divergent segment.Gradient is the even thick coal culm air-flow of reducing pipe of 3 °～1O °, and the coal dust in the thick coal culm pipe is evenly distributed; Straight section and divergent segment are the variations of eliminating the coal dust speed of converging transition generation, help the ignition point of stabilizing burner outlet, and the gradient of this divergent segment is 6 °～10 °.This reducing pipe 7 forms a sphenoid with separating dividing plate 14 at the burner outlet place, the existence that this separates dividing plate 14 helps forming the recirculating zone of stable ignition; And the existence of this sphenoid, can postpone mixing dense, the thin powdered coal air-flow, make the flame in the burner hearth elongated, the furnace profile flame temperature of burner region reduces, and helps reducing NO
xGeneration.
In the thin powdered coal pipeline 8 of the bottom of a wind coal pipe 1, fixing swirl vane 9 is set, by this fixing swirl vane, make the thin powdered coal air-flow produce rotation, strengthen the disturbance of thin powdered coal air-flow, the mixing intensity of the thick coal culm air-flow that helps the thin powdered coal air-flow and caught fire helps catching fire and completing combustion of thin powdered coal air-flow.
Be furnished with swirl vane 10 in the interior secondary air channel, it can be regulated by adjusting yoke 12, according to the variation of boiler load and coal, and the swirl strength of secondary wind in corresponding the change, and then the size of change recirculating zone, reach and regulate the ignition point and the purpose of fire intensity.Also be furnished with the rotary body 11 of inner surface belt curve conduit 13 on the wall of the front end of this swirl vane 10, this curve conduit 13 is at 45 with the tangent line of rotary body 11, as Fig. 6, shown in Figure 7.The existence of this rotary body 11, avoided owing to the adjustable of swirl vane in the manufacturability slit of the wall place of interior secondary air channel formation, such slit makes the required air miscarriage of boiler combustion give birth to overlap when underload easily, thereby produce the black dragon of coal dust, make combustion instability, also can produce flame-out under the serious situation; On the other hand, its curve conduit has been strengthened the swirl strength of edge air-flow again, helps enlarging the diameter of recirculating zone and the diameter of flame, helps evening up and reduces the flame zone temperature.
Directly in torch oil gun 2 is arranged in so that 2～5 ° inclination angle is oblique in the secondary air channel 5, this layout is easy to make the oblique root that stretches into thick coal culm of oil gun, help effectively lighting a fire with less burning oil, and because this position does not have the existence of coal dust, and can not produce the wear problem of oil gun.
In the outer secondary air channel 4 of the present invention without any parts, formation be the outer secondary wind of direct current, its higher 45-60m/s of speed on the one hand can improve it and the dynamic pressure ratio of interior secondary wind like this, in time replenishes imperfect combustion coke of later stage and burns required oxygen; High like this speed makes the rigidity of outer secondary wind stronger simultaneously, still there is certain speed at burning later stage jet, help to improve the disturbance of the small scale in burning later stage, thereby the outer secondary wind of higher direct current can be outside the disturbance of the large scale in improving burner hearth, also help the disturbance of small scale, for reducing the imperfect combustion heat loss is favourable, also can obviously reduce carbon content of fly ash.Simultaneously, the outer secondary wind of direct current at a high speed can cause the combustion system of bellows chamber powder, making furnace wall cooling neighbouring is oxidizing atmosphere, and ash fusion point is higher under this atmosphere, has so both helped the anti-caking slag, also help and prevent high temperature corrosion, and the jet ejector action of such high-speed jet, the diameter and the range of the flame of air-flow are all rised appreciably, this mode has been drawn back the bulk temperature level of the flame of burner region, and temperature peak has also reduced, according to NO
xGenerating principle can reduce NO
xGrowing amount, and time of staying that strengthens particle, the NO that reduction is generated
xAmount increase.
Secondary wind and outer secondary air separating are regulated the air quantity in any one air channel separately not by independent bellows air feed in of the present invention, can be owing to the variation of the pressure of the same bellows air quantity to another air channel exerts an influence.
Burner of the present invention airduct, interior secondary air channel and outside the end of secondary air channel all be furnished with flared tube, change according to the diameter of axial symmetry following wake rule with 1/3 power of axial distance, the spout extended corner that designs them should be at 15-18 °, so both helped the expansion of air-flow, also help reducing the drag losses of air-flow, improve the length of flame, postpone the position of peak flame temperature point.
Claims (6)
1. circular cyclone concentration coal burner, contain a wind coal pipe (1) of being with elbow, be successively set on wind coal pipe outside and interior secondary air channel (5) of eddy flow that install with one heart and the outer secondary air channel (4) of direct current one time, at a said wind coal pipe, the leading section of the outer secondary air channel of secondary air channel and direct current is equipped with enlarging in the eddy flow, be furnished with swirl vane (10) and torch oil gun (2) in the secondary air channel in described (5), it is characterized in that: a separation dividing plate (14) is set in a wind coal pipe airduct is divided into bias pulverized coal pipeline up and down, described separation dividing plate is made of straight plate and downward-sloping swash plate, is furnished with aperture at the rear end part of this straight plate; A reducing pipe (7) that is used for even breeze airflow is set in the thick coal culm pipeline on described top, and this reducing pipe is made up of converging transition, straight section and divergent segment, and the bottom of reducing pipe forms sphenoid with described the separation between the dividing plate; In the thin powdered coal pipeline (8) of the bottom of a described airduct, fixing swirl vane (9) is set; In described, be furnished with the rotary body (11) of inner surface belt curve conduit (13) on the wall of the front end of the swirl vane of secondary air channel (10).
2. according to the described circular cyclone concentration coal burner of claim 1, it is characterized in that: the adjustable swirl vane of swirl vane (10) employing activity of secondary air channel in described.
3. according to the described circular cyclone concentration coal burner of claim 1, it is characterized in that: the height of described curve conduit (13) is 10～20 millimeters, and the tangent line of curve conduit and rotary body is at 45.
4. according to the described circular cyclone concentration coal burner of claim 1, it is characterized in that: the extended corner of described each enlarging is at 15～18 °.
5. according to the described circular cyclone concentration coal burner of the arbitrary claim of claim 1～4, it is characterized in that described in secondary air channel (5) and the outer secondary air channel (4) of direct current be connected with independent bellows respectively.
6. according to the described circular cyclone concentration coal burner of the arbitrary claim of claim 1～4, it is characterized in that: described torch oil gun (2) with 2～5 ° downward inclination angle oblique be arranged in secondary air channel directly over.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009535 CN1279313C (en) | 2004-09-10 | 2004-09-10 | Circularly shirl coal powder burn device with various concentration coal powder pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009535 CN1279313C (en) | 2004-09-10 | 2004-09-10 | Circularly shirl coal powder burn device with various concentration coal powder pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1598403A CN1598403A (en) | 2005-03-23 |
| CN1279313C true CN1279313C (en) | 2006-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410009535 Expired - Fee Related CN1279313C (en) | 2004-09-10 | 2004-09-10 | Circularly shirl coal powder burn device with various concentration coal powder pipe |
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| CN (1) | CN1279313C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308618C (en) * | 2005-03-24 | 2007-04-04 | 华中科技大学 | Main burner equipment with adjustable outer rotational flow and inner direct flow |
| CN200940831Y (en) * | 2006-05-17 | 2007-08-29 | 杭州意能电力技术有限公司 | Pulverized coal burner with partition |
| CN101578482B (en) * | 2007-07-18 | 2011-03-23 | 哈尔滨工业大学 | Low nox swirling pulverized coal burner |
| CN101363625B (en) * | 2008-09-26 | 2010-06-02 | 哈尔滨工业大学 | Large speed ratio centrally powder-feeding cyclone burner for pulverized coal |
| CN102393015A (en) * | 2011-05-27 | 2012-03-28 | 上海锅炉厂有限公司 | Dense-phase spiral-flow pulverized-coal burner |
| CN102287829A (en) * | 2011-09-24 | 2011-12-21 | 徐道芹 | Direct flow and swirl flow joint outlet-type burner |
| CN102679338B (en) * | 2012-05-30 | 2014-07-23 | 山西蓝天环保设备有限公司 | Efficient coal dust combustor for reducing smoke NOx content |
| CN103047657A (en) * | 2012-12-19 | 2013-04-17 | 上海巴安水务股份有限公司 | High-efficiency low NOx emission swirling burner and burning method thereof |
| CN104197326A (en) * | 2014-07-15 | 2014-12-10 | 北京神雾环境能源科技集团股份有限公司 | Novel swirl pulverized coal burner |
| CN112443833B (en) * | 2019-09-05 | 2023-01-06 | 中国科学院工程热物理研究所 | Pulverized coal fired boiler with bottom-mounted burner and control method thereof |
| CN111253033A (en) * | 2020-03-12 | 2020-06-09 | 北京云水浩瑞环境科技有限公司 | System and method for mobile treatment of sludge in villages and towns |
| CN111795381B (en) * | 2020-07-23 | 2022-07-19 | 郑州轻工业大学 | Cyclone with adjustable swirl vanes for pulverized coal burner |
| CN114408585A (en) * | 2022-01-24 | 2022-04-29 | 润电能源科学技术有限公司 | Gas-solid uniform distribution device for conveying pipeline |
-
2004
- 2004-09-10 CN CN 200410009535 patent/CN1279313C/en not_active Expired - Fee Related
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| CN1598403A (en) | 2005-03-23 |
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