CN102269413A - Garbage incinerator double-layer rational flow over-fire air arranging device - Google Patents
Garbage incinerator double-layer rational flow over-fire air arranging device Download PDFInfo
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- CN102269413A CN102269413A CN2011102501909A CN201110250190A CN102269413A CN 102269413 A CN102269413 A CN 102269413A CN 2011102501909 A CN2011102501909 A CN 2011102501909A CN 201110250190 A CN201110250190 A CN 201110250190A CN 102269413 A CN102269413 A CN 102269413A
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Abstract
The invention provides a garbage incinerator double-layer rational flow over-fire air arranging device which comprises a first-layer over-fire air nozzle, a second-layer over-fire air nozzle, an over-fire air pipe and an over-fire air door, wherein the two layers of over-fire air nozzles are arranged on the bottom positions of front and back walls of the furnace hearth, the over-fire air nozzles are horizontally arranged, half of the nozzles are arranged vertical to the furnace hearth and half nozzles are deflected by a designed angle, so that the leading and driving effect of high-speed jet flow can be utilized, flue gas can be impelled to generate spiral ascending air flow, air flow disturbance in the furnace hearth can be strengthened, and flue gas route and residence time of flue gas can be effectively prolonged and full decomposition of harmful gases such as dioxins and the like can be ensured. The application of the over-fire air also aims at distributing air on a basis of classification, improving burn-off rate and reducing the generation amount of NOx. The invention can solve the problems of insufficient flue gas residence time, high fly ash combustible content and low burn-off rate and the like existing in the garbage incinerator which is not installed with the over-fire air device or only adopts vertical furnace wall injection as an over-fire air arrangement mode.
Description
Technical field
The present invention relates to garbage combustion device, particularly the double-deck eddy flow after-flame of incinerator wind arrangement apparatus.
Background technology
Over nearly 20 years, China's domestic waste generation high speed development is the prerequisite of environment sustainable development to the harmless treatment of rubbish.The waste incineration and generating electricity technology has innoxious, minimizing, and the characteristics of resource have good benefits in environment and social benefit, are one of optimal selections to comprehensive garbage disposal.The Chinese government carries forward vigorously development waste incineration and generating electricity technology, and incineration treatment of garbage presents the impetus of rapid growth in China.In Guangdong, Jiangsu and zhejiang and other places all build or bulky refuse incineration plant under preparation successively.
Along with urban domestic garbage incinerator to large scale development, unit group treating capacity constantly increases; Simultaneously, garbage incineration technology improve gradually and ripe, make problems such as efficient that are concerned about the incineration treatment of garbage process and environmental protection more.The air stratification combustion technology has been widely used in the various types of coal-burning boilers of thermal power plant, by reasonable disposition after-flame wind, reduces NO
xDischarging.For urban domestic garbage incinerator, for the completing combustion that guarantees combustible granules in the inner flue gas of the stove with control NO better
xGeneration, the application of after-flame wind (OFA) seems and becomes more and more important, at present part newly-built or build in the large size city domestic waste incineration be furnished with combustion exhausted wind apparatus.
Airborne N
2At high temperature could and O
2React and generate heating power type NO
xWhen the oxygen content in combustion chamber high temperature zone is not enough, the NO of generation
xNature will reduce.And enter in the burner hearth that is provided with combustion exhausted wind apparatus, sheaf space is owing to the reduction of temperature, N on the after-flame wind
2And O
2Be swift in response and weaken, the NO of generation
xAlso corresponding minimizing.The application of after-flame wind is based on the air stratification combustion technology, is intended to carry out staged air distribution, and in the combustible granules after-flame required air, NO is controlled in stagger burner hearth high-temperature area and oxygen enrichment zone effectively in replenishing flue gas
xGeneration.
The fast development of waste incineration receives much concern its problem of environmental pollution, particularly discharge of harmful gases such as bioxin control.Bioxin time of staying in high-temperature area more than 850 ℃ surpasses 2s and can decompose fully.Flue gas tissue in the burner hearth has directly influence to the ignition temperature and the time of staying of flue gas.After-flame wind adopts high-speed jet to infeed burner hearth mostly, if make full use of the leader tape effect of its high-speed jet, can influence the inner flow of flue gas tissue of burner hearth to a certain extent.And flow of flue gas tissue prolong smoke flow process effectively reasonably increases the time of staying of flue gas in burner hearth, and this is very meaningful to the generation that suppresses pernicious gases such as bioxin, furans.
Summary of the invention
The objective of the invention is combustion exhausted wind apparatus not to be installed or only to be adopted vertical furnace wall to go into the existing gas residence time deficiency of incinerator of the after-flame wind arrangement of spray for solving, problems such as unburned combustible in fly ash height and burn-off rate are low provide the double-deck eddy flow after-flame of incinerator wind arrangement apparatus.
The technical solution adopted for the present invention to solve the technical problems is:
The double-deck eddy flow after-flame of incinerator of the present invention wind arrangement apparatus, the combustion chamber, the burner hearth that comprise incinerator, described burner hearth comprises front wall, Hou Qiang, at the combustion chamber of incinerator and the intersection of burner hearth, be front wall and the back wall bottom position on be furnished with two-layer after-flame wind nozzle, just be arranged in the boundary transition region of face arch and the rear arch and the burner hearth of combustion chamber.The above-mentioned every grate firing to the greatest extent import after-flame airduct corresponding and separately of wind nozzle is communicated with, and after-flame wind nozzle is communicated with burner hearth, shown in junction between after-flame wind nozzle and the after-flame airduct be provided with the after-flame air door.
Described two-layer after-flame wind nozzle is divided into ground floor after-flame wind nozzle, second layer after-flame wind nozzle; Described ground floor after-flame wind nozzle place cross-sectional distance burner hearth bottom is 0.5m～0.8m, second layer after-flame wind nozzle place cross-sectional distance ground floor after-flame wind nozzle place cross section 0.5m～0.8m.The quantity that this two-layer after-flame wind nozzle is every layer is 8, and promptly every layer front wall has 4, and back wall has 4, is arranged at interval respectively on the wall of front wall and back wall successively.Two-layer after-flame wind nozzle left and right sides yawing moment unanimity.
It is 35～45 ° that ground floor after-flame wind nozzle goes into to spray angle [alpha] 1, and it is 30～40 ° that second layer after-flame wind nozzle goes into to spray angle [alpha] 2.
Certainly go into to spray angle than ground floor after-flame wind nozzle and all can obtain comparatively desirable effect for little 5 ° as long as second layer after-flame wind nozzle goes into to spray angle [alpha].
The air quantity ratio of ground floor after-flame wind nozzle and the ejection of second layer after-flame wind nozzle is 2～3: 1, and the effluxvelocity of ground floor after-flame wind nozzle is 50～60m/s.
Make the effluxvelocity of second layer after-flame wind nozzle be lower than the effluxvelocity of ground floor after-flame wind nozzle as far as possible.Certainly, the effluxvelocity of second layer after-flame wind nozzle is preferably 25～30m/s.
The present invention is with respect to not adopting the incinerator that combustion exhausted wind apparatus is installed that following advantage is arranged:
1. the application of after-flame wind is based on the air stratification combustion technology, is intended to carry out the layering air distribution, replenishes combustible granules after-flame required air in the flue gas, thereby when improving burn-off rate, NO is controlled in stagger burner hearth high-temperature area and oxygen enrichment zone effectively
xGeneration.
2. be furnished with two-layer after-flame wind nozzle on the bottom position of front wall and back wall, every grate firing air port after-flame airduct corresponding and separately of wind nozzle to the greatest extent is communicated with, and after-flame wind nozzle is communicated with burner hearth.Make full use of the leader tape effect of after-flame wind high-speed jet, impel flue gas in burner hearth, to form the spiral ascending air, strengthen the turbulivity of air-flow in the burner hearth, strengthen the heat exchange of flue gas and water-cooling wall, increase the flue gas flow and the following time of staying of high temperature simultaneously, guarantee the abundant decomposition of pernicious gases such as bioxin, furans.
The technology of the present invention means are simple and easy to do, not only possess above-mentioned advantage, and can make the mixing more fully of combustible granules and air, thereby improve burn-off rate better.
Description of drawings
Fig. 1 is the structural representation of the double-deck eddy flow after-flame of incinerator of the present invention wind arrangement apparatus.
Fig. 2 is an A-A cutaway view among Fig. 1.
Fig. 3 is a B-B cutaway view among Fig. 1.
Fig. 4 is the speed vector figure of second layer after-flame wind nozzle place cross section.
Among the figure: second layer after-flame wind nozzle 1, after-flame airduct 2; After-flame air door 3; Ground floor after-flame wind nozzle 4; Face arch 5; Rear arch 6; Combustion chamber 7; Burner hearth 8; Back wall 9; Front wall 10.
The specific embodiment
Below the specific embodiment of the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, the double-deck eddy flow after-flame of incinerator of the present invention wind arrangement apparatus, the combustion chamber 7, the burner hearth 8 that comprise incinerator, described burner hearth 8 comprises front wall 10, back wall 9, at the combustion chamber 7 of incinerator and the intersection of burner hearth 8, be to be furnished with two-layer after- flame wind nozzle 1,4 on the bottom position of front wall 10 and back wall 9, just be arranged in the boundary transition region of the face arch 5 of combustion chamber 7 and rear arch 6 and burner hearth 8.
The above-mentioned every grate firing to the greatest extent import after-flame airduct 2 corresponding and separately of wind nozzle is communicated with, and after-flame wind nozzle is communicated with burner hearth 8, shown in junction between after-flame wind nozzle and the after-flame airduct 2 be provided with after-flame air door 3.
Described two-layer after-flame wind nozzle is divided into ground floor after-flame wind nozzle 4, second layer after-flame wind nozzle 1; Cross-sectional distance burner hearth 8 bottoms, described ground floor after-flame wind nozzle 4 place are about 0.5m～0.8m, and cross section, cross-sectional distance ground floor after-flame wind nozzle 4 place, second layer after-flame wind nozzle 1 place is about 0.5m～0.8m.
Adopting two-layer after-flame wind arrangement of nozzles mode, is in order to guarantee the formation of burner hearth 8 inside spin ascending airs better, and improves the intensity and the scope of spiral ascending air.Two-layer after-flame wind injector spacing is from unsuitable excessive, otherwise is unfavorable for the formation of spiral ascending air; Also unsuitable too small, otherwise deviated from the original intention that two-layer after-flame wind designs, jet leader tape effect is only near with individual layer after-flame wind facies.
Shown in Figure 3 as Fig. 2.This two-layer after- flame wind nozzle 4,1, every layer quantity is general to adopt 8, and promptly every layer front wall 10 can be provided with 4, and back wall 9 is provided with 4, is arranged at interval successively on the wall of front wall 10 and back wall 9.Distance at interval can be determined as the case may be.
For the most wind nozzle 1,4 of each grate firing, after- flame wind nozzle 1,4 is horizontally disposed, and wherein 4 after-flame wind nozzle vertical furnace wall papers are put, and other 4 after-flame wind nozzle deflection certain angles form two tangent elliptical vortexes to impel on the cross section.For deflection angle, promptly to go into to spray angle [alpha] 1 be 35～45 ° to ground floor after-flame wind nozzle 4, and it is 30～40 ° that second layer after-flame wind nozzle 1 goes into to spray angle [alpha] 2.Certainly angle is adjustable within the specific limits, and vertical furnace wall is gone into the operating mode of spray (α=0).
Second layer after-flame wind nozzle 1 goes into to spray angle [alpha], and to go into to spray angle than ground floor after-flame wind nozzle 4 little 5 °.
Two-layer after- flame wind nozzle 4,1 left and right sides yawing moment must be consistent up and down for this.
The air quantity ratio of ground floor after- flame wind nozzle 4 and 1 ejection of second layer after-flame wind nozzle is about 2～3: 1, and the effluxvelocity of ground floor after-flame wind nozzle 4 is about 50～60m/s.The effluxvelocity of second layer after-flame wind nozzle 1 is lower than the effluxvelocity that should be lower than ground floor after-flame wind nozzle 4.The effluxvelocity of second layer after-flame wind nozzle 1 can be preferably 25～30m/s.
But effluxvelocity also should not be low excessively, misses one's aim otherwise can't form bumpy flow because of range is too short easily.Two-layer after-flame wind nozzle adopts identical caliber, can select suitable nozzle caliber for use according to required after-flame air quantity size during designs of nozzles, to obtain suitable after-flame wind effluxvelocity.
For most of urban domestic garbage incinerator, the more length-width ratio that is designed to of burner hearth 8 cross sections is about 2: 1 rectangle.
After-flame airduct 2 is connected to (not shown) on the secondary air box, and after-flame wind and secondary wind facies are all cold wind and infeed together.After-flame wind total blast volume accounts for total blast volume about 10%, and each grate firing air quantity of wind nozzle 4,1 is to the greatest extent controlled by the after-flame air door 3 of correspondence.
The after-flame wind-warm syndrome adopts cold wind, and keeping total after-flame air quantity is the 9.7% constant of total blast volume, and certainly, the air quantity of ground floor after-flame wind nozzle 4 is taken as 1: 1 with the ratio of second layer after-flame air quantity nozzle, and 2: 1,2.5: 1,3: 1 and 4: 1 five kinds of ratios.Ground floor after-flame wind nozzle 4 can be regulated by after-flame air door 3 separately with the wind speed of second layer after-flame wind nozzle.
According to the incinerator design parameter, each operating condition of analog computation obtains result shown in the table 1.The speed vector figure of second layer after-flame wind nozzle place cross section as shown in Figure 4 among the operating mode #6.The result shows, adopts suitable after-flame wind to go into to spray angle and two-layer after-flame air quantity ratio, can impel the flue gas in cross section, after- flame wind nozzle 4,1 place to form two tangent elliptical vortexes, thereby impel flue gas to form the spiral ascending air in burner hearth 8.This compares and only simply adopts the vertical furnace wall paper to put the operating mode # 1 of after-flame wind nozzle, has obviously improved the turbulivity in the burner hearth 8, has prolonged flue gas motion path in burner hearth 8, and has effectively increased the time of staying of flue gas in burner hearth 8.
Table 1
Just can realize the present invention preferably as mentioned above.
Claims (9)
1. the double-deck eddy flow after-flame of incinerator wind arrangement apparatus, the combustion chamber, the burner hearth that comprise incinerator, described burner hearth comprises front wall, Hou Qiang, it is characterized in that: at the combustion chamber of incinerator and the intersection of burner hearth, be front wall and the back wall bottom position on be furnished with two-layer after-flame wind nozzle, every grate firing import after-flame airduct corresponding and separately of wind nozzle to the greatest extent is communicated with, and after-flame wind nozzle is communicated with burner hearth, and the junction between described after-flame wind nozzle and the after-flame airduct is provided with the after-flame air door.
2. device as claimed in claim 1 is characterized in that: described two-layer after-flame wind nozzle is divided into ground floor after-flame wind nozzle, second layer after-flame wind nozzle; Described ground floor after-flame wind nozzle place cross-sectional distance burner hearth bottom is 0.5m～0.8m, second layer after-flame wind nozzle place cross-sectional distance ground floor after-flame wind nozzle place cross section 0.5m～0.8m.
3. device as claimed in claim 2 is characterized in that: the quantity that this two-layer after-flame wind nozzle is every layer is 8, and promptly every layer front wall has 4, and back wall has 4, is arranged at interval respectively on the wall of front wall and back wall successively.
4. as each described device in the claim 1 to 3, it is characterized in that: ground floor after-flame wind nozzle goes into to spray angle [alpha]
1Be 35～45 °, second layer after-flame wind nozzle goes into to spray angle [alpha]
2It is 30～40 °.
5. as each described device in the claim 1 to 3, it is characterized in that: second layer after-flame wind nozzle goes into to spray angle [alpha], and to go into to spray angle than ground floor after-flame wind nozzle little 5 °.
6. device as claimed in claim 4 is characterized in that: two-layer after-flame wind nozzle left and right sides yawing moment unanimity.
7. device as claimed in claim 4 is characterized in that: the air quantity ratio of ground floor after-flame wind nozzle and the ejection of second layer after-flame wind nozzle is 2～3: 1, and the effluxvelocity of ground floor after-flame wind nozzle is 50～60m/s.
8. device as claimed in claim 4 is characterized in that: the effluxvelocity of second layer after-flame wind nozzle is lower than the effluxvelocity of ground floor after-flame wind nozzle.
9. device as claimed in claim 4 is characterized in that: the effluxvelocity of second layer after-flame wind nozzle is 25～30m/s.
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| CN2011102501909A CN102269413B (en) | 2011-08-29 | 2011-08-29 | Garbage incinerator double-layer rational flow over-fire air arranging device |
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Cited By (5)
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| CN102637239A (en) * | 2011-12-27 | 2012-08-15 | 华南理工大学 | Partitioning model of garbage incinerator with grate and distinguishing method for various zones |
| CN102954473A (en) * | 2012-11-29 | 2013-03-06 | 华南理工大学 | Air blowing-in device of garbage low-nitrogen and low-dioxin grate incinerator |
| CN103363528A (en) * | 2013-07-23 | 2013-10-23 | 华南理工大学 | Tuyere arrangement device for preventing high temperature corrosion of water-cooled wall of garbage incinerator |
| CN103672940A (en) * | 2014-01-08 | 2014-03-26 | 上海卫源节能环保科技有限公司 | Method for reducing nitrogen oxide generated by combustion of boiler |
| CN108317520A (en) * | 2017-12-21 | 2018-07-24 | 北方重工集团有限公司 | A kind of garbage incinerator double-layer vortex secondary air system |
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| CN103363528A (en) * | 2013-07-23 | 2013-10-23 | 华南理工大学 | Tuyere arrangement device for preventing high temperature corrosion of water-cooled wall of garbage incinerator |
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| CN108317520A (en) * | 2017-12-21 | 2018-07-24 | 北方重工集团有限公司 | A kind of garbage incinerator double-layer vortex secondary air system |
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| CN102269413B (en) | 2013-11-27 |
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Application publication date: 20111207 Assignee: GUANGZHOU WEIGANG ENVIRONMENT TECHNOLOGY CO., LTD. Assignor: South China University of Technology Contract record no.: 2015990000972 Denomination of invention: Garbage incinerator double-layer rational flow over-fire air arranging device Granted publication date: 20131127 License type: Exclusive License Record date: 20151120 |
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Effective date of registration: 20151229 Address after: No. 80 Guangzhou science and technology innovation base in E District 510000 Guangdong city of Guangzhou province high tech Industrial Development Zone of Guangzhou Science City on road 208-210 Patentee after: GUANGZHOU WEIGANG ENVIRONMENT TECHNOLOGY CO., LTD. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: South China University of Technology |