燃用烟煤的DG-67013.5-540540电站煤粉锅炉热力计算

毕业设计（论文）燃用烟煤的DG-670/13.5-540/540电站煤粉锅炉热力计算中原工学院本科毕业论文摘要I摘要与发达国家相比，我国电力工业的起步较晚。经过半个多世纪的学习、借鉴、和发展，现在，我国已有能力自行制造1000MW的超临界、超超临界电站锅炉。虽然我国已有大量亚临界及其以上大型锅炉自主的制造和运行经验，但与世界先进机组相比还有一定差距，应当尽快进行改造，缩短这些差距。本设计是670t超高压锅炉热力计算，在设计过程中，能对锅炉在燃煤过程中可能遇到的问题进行一些分析和思考，进一步降低每千瓦的设备投资、金属消耗，并提高机组运行的经济性和安全性，高参数、大容量、高自动控制技术的大型电站锅炉在运行中存在的过热器和再热器超温爆管、水冷壁高温腐蚀及爆管、尾部受热面的磨损、腐蚀等现象的发生，这些现象不仅降低了锅炉的热效率，同时也影响锅炉的安全性和可靠性。通过设计本身，了解锅炉结构知识，为今后工作中可能遇到的锅炉问题，能够提供一些理论支持。设计锅炉炉膛需要分析、了解锅炉受热面布置细节，充分了解炉膛结构设计与炉膛容积；炉膛内炉墙总面积；炉膛有效辐射受热面积；炉膛火焰有效辐射层厚度；炉膛水冷程度等因素的影响，通过多次取值校核，让炉膛出口烟温为1134℃，在误差范围内，并低于煤种变形温度，使本身设计更加适合煤种燃烧的要求。关键词：煤种分析、炉膛、热力计算、受热面。中原工学院本科毕业论文ABSTRACTIIABSTRACTComparedwithdevelopedcountries,China'spowerindustrystartedlate.Afterhalfacenturyofstudy,learnanddevelop,andnow,Chinahastheabilitytomanufacture1000MWsupercritical,ultra-supercriticalpowerplantboiler.AlthoughChinahasalargenumberofsub-criticalandmoreself-sufficientlargeboilermanufacturingandoperationexperience,buttheworldstilllagsfarbehindtheadvancedunits,shouldbetransformedassoonaspossibletoshortenthegap.Thisdesignissub-critical300MWnaturalcirculationboilerfurnacedesign,indesignprocess,canbecoal-firedboilerinquestionmightencountersomeanalysisandreflection,tofurtherreducetheequipmentinvestmentperkilowatt,metalconsumption,andimproveunitoperationandsecurityoftheeconomy,high-parameter,largecapacity,highautomaticcontroltechnologyintheoperationoflargeboilersuperheaterandthereReheatertemperatureburstpipes,waterwallhigh-temperaturecorrosionandburstpipes,rearheatingsurfacewear,corrosionandotherphenomena,thesephenomenanotonlyreducesthethermalefficiencyoftheboiler,butalsoaffectthesafetyandreliabilityoftheboiler.Throughthedesignitself,tounderstandtheboilerstructureknowledgeforfutureworkthatmaybeencounteredintheboilerproblem,canprovidesometheoreticalsupport.Designofboilerfurnaceneedstounderstandthelayoutoftheboilerheatingsurfacedetails,fullyunderstandthestructuraldesignofthefurnaceandthefurnacevolume;thetotalareaofthefurnacewallfurnace;activeradiationheatingfurnacearea;effectiveradiationthicknessofthefurnaceflame;furnacewaterlevelandotherfactors,Checkedbymultiplevalues,sothatfurnaceexitgastemperaturewas1137.58℃,withinerrors,andlowerthanthecoaldeformationtemperature,sothattheirdesignismoresuitedtotherequirementsofcoalcombustion.Keywords:coalanalysis,boiler,thermalcalculation,heatedsurface中原工学院本科毕业论文目录III目录摘要......................................................................................................................I1绪论..................................................................................................................11.1设计目的...............................................................................................11.2设计要求...............................................................................................11.3设计及计算方法...................................................................................11.4现状与趋势...........................................................................................11.5设计任务书...........................................................................................21.5.1设计题目：................................................................................21.5.2原始资料....................................................................................21.6煤的元素分析数据校核和煤种判别...................................................31.6.1煤的元素各成分之和为100%的校核.....................................31.6.2元素分析数据校核....................................................................31.6.3煤种判别....................................................................................31.7计算方法及主要参数的选取...............................................................41.7.1锅炉热力计算方法....................................................................41.7.2热空气温度的选择....................................................................42锅炉整体布置..................................................................................................62.1炉整体的外型——选Π型布置...........................................................62.2受热面的布置.......................................................................................62.3汽水系统...............................................................................................73燃烧计算和锅炉热平衡计算..........................................................................83.1燃烧计算...............................................................................................83.2热平衡及燃料消耗量计算.................................................................154炉膛热力计算................................................................................................174.1炉膛结构尺寸计算.............................................................................174.1.1炉膛的几何特征参数及确定原则..........................................174.1.2炉膛容积的确定......................................................................174.1.3锅炉炉墙和水冷壁..................................................................20中原工学院本科毕业论文目录IV4.1.4炉膛结构数据..........................................................................214.2炉膛热力计算.....