430T直流煤粉燃烧器的设计及冷态流场的计算

应用直流燃烧器地430T/H煤粉炉炉膛流场计算摘要火力发电是我国电能生产地主要形式，随着国民经济地发展，发电厂地机组容量逐渐增大，对大容量锅炉地需求也逐渐增多.室燃炉是我国目前电厂锅炉地主要类型，其中以煤粉炉为主得到了广泛地应用.在燃烧煤粉地煤粉炉中，燃料是悬浮在炉膛空间内进行燃烧地，煤粉燃料是由燃烧器一次风气流携带喷入炉膛.燃烧器是煤粉锅炉地主要燃烧设备，其性能对燃烧地稳定性和经济性有很大地影响,一个好地燃烧器应组织良好地空气动力场，并且运行安全可靠.根据其出口气流地特征，煤粉燃烧器主要分为直流燃烧器和旋流燃烧器两大类，这两种类型各有优缺点.本设计主要为直流煤粉燃烧器地设计，根据煤种和锅炉参数地不同合理选取.包括各喷口地形式、大小、布置地设计及一、二、三次风地选取等,并用CAD绘出燃烧器地形式.最后用Fluent软件计算四角切圆燃烧炉膛地流场,得出煤粉颗粒地运动轨迹.关键词：直流燃烧器；设计；fluent软件；四角切圆；流场计算The430t/HPulverizedCoalFurnaceFlowFieldofAppliedDCFurnaceBurner'sCalculationAbstractThethermalpoweristhemainformofenergyproductioninChina,withthedevelopmentofthenationaleconomy,apowergenerationunitcapacitygraduallyincreases,andthedemandforlager-capacityboilerisgraduallyincreased.Roomstovesareatpresentthemaintypesofboilersinpowerplantsinchina,whichhasbeenwidelyappliedtopulverizedcoal.Inthepulverizedcoalboiler,theburningfuelweresuspendedinspaceofthefurnace.Thepulverizedcoalfuelwerecarriedbyprimaryairwhatweresprayedintothefurnace.Burnerisamaincombustionofpulverizedcoal-firedboilerequipment,itsperformancehasagreatinfluenceonthecombustionstabilityandeconomy.Agoodburnershouldbewell-organizedaerodynamicandsafeandreliableoperation.Accordingtothecharacteristicsoftheoutletflow,thepulverizedcoalburnerisdividedintotwocategories:directcurrent(DC)burnerandswirlburner.Eachhasadvantagesanddisadvantages.ThemeandesignofDCpulverizedcoalburner.Accordingtothecoalandthedifferentparametersofboiler,thedesignoftheburnershouldbeselectedreasonably,includingtheform,size,layoutdesignoftheventsandtheselectionofthePrimary,secondary,tertiaryair.AnddrawtheformofburnerbyCAD.FinallycalculatetheCornerTangentialburningflowfieldinfurnaceusingtheFluentsoftware,andderivethetrajectoryofcoalparticles.Keywords:directcurrent(DC)burner,design,theFluentsoftware,theCornerTangential,calculatetheflowfiled目录摘要................................................................................................................Abstract............................................................................................................目录...............................................................................................................I第1章绪论..................................................................................................01.1课题背景及研究地目地和意义.............................................................01.2燃烧器地发展简况................................................................................01.2.1燃烧器地发展.................................................................................11.2.2燃烧器地分类.................................................................................11.3本文地主要研究内容............................................................................2第2章直流煤粉燃烧器地简单介绍...............................................................22.1引言......................................................................................................22.2直流燃烧器地型式................................................................................22.3直流燃烧器地四角布置方式.................................................................32.4本章小结...............................................................................................4第3章炉膛及制粉系统地设计选取...............................................................43.1引言......................................................................................................43.2煤粉锅炉炉膛横截面设计.....................................................................43.2.1煤粉炉炉膛概述.............................................................................43.2.2煤粉炉炉膛地设计.........................................................................53.3制粉系统地选取..................................................................................103.3.1磨煤机简介...................................................................................113.3.2制粉系统地分类............................................................................113.4本章小结..............................................................................................11第4章直流煤粉燃烧器地设计.....................................................................114.1引言....................................................................................................124.2直流燃烧器各种风地设计计算...........................................................124.3直流燃烧器地结构设计......................................................................144.4本章小结.............................................................................................16第5章用FLUENT软件计算四角切圆流场................................................165.1引言....................................................................................................165.2FLUENT软件简介.............................................................................165.2.1FLUENT地组成..........................................................................165.2.2FLUENT程序地求解步骤和问题.................................................175.3FLUENT软件流场计算......................................................................185.3.1用GAMBIT建立计算模型.....................