板式换热器以其良好的传热性能被应用于化工!石化!冶金等领域的热交换过 程,且随着结构的不断改进,设计和运行参数范围日益扩大根据火电机组的凝汽 器的工况范围及对传热和流动的要求,从典型板式换热器的性能实验测试,以及机 组冷端系统的热力性能计算两个方面,对紧凑式板式换热器替换传统的管壳式换热 器进行了可行性研究针对某火电机组,从传热和阻力特性的角度,提出板式凝汽 器的设计方案,并与原有管壳式凝汽器的性能进行对比分析研究结果为板式换热 器应用在电站冷端系统提供参考 关键词:板式凝汽器,火电机组,管壳式凝汽器 ABSTRACT Plateheatexehangers,withitsgoodheattransferPerformance,areusedinchemical, Petrochemical,metallurgiealandotherfieldsoftheheatexchangeProeess,andwiththe struetureofPlateheatexehangerseontinuouslyimProving,thedesignandtherangeof oPerationParametersareinereasinglylarge.ThisPaPer,aceordingtheworkingeondition seoPeofeondenserinthermalPowerunitandtherequirementsofheattransferandflow eharacteristies,carriesoutafeasibilitystudyonPlateheatexchangersrePlaeingthe traditionaltube一and一shellheatexehangers.It15carriedoutfromtwoasPec一s:the PerformancetestoftyPicalPlateheatexehangerandthecaleulationofthermal Ferformaneeincooling一endsystemofPowerunit.ForathermalPowerunits,ftomthe PersPectiveofheattransferandresistaneeeharacteristies,thisPaPerProPosesadesign PlanofthePlateeondenserandcomParesandanalyzesthePerformaneeoforiginal tube一and一shelleondenser.TheresultsProvidearefereneeforPlateheatexehangersused inPowerstationeooling一endsystem. ShiYouni(EngineeringThermoPhysics) DirectedbyProf.DuXiaoze KEYWORDS:Platecondenser.Powerunit,tube#and#shellcondenser华北电力大学硕士学位报告 目录 摘要...................................................................................................................................I ABS丁RACT...............................................................................................................................I 目录..................................................................................................................................n 主要符号表........................................................................................................................W 第一章绪论........................................................................................................................1 1.1研究背景.................................................................................................................1 1.2板式换热器的研究进展和应用.............................................................................3 1.3本报告的主要内容.................................................................................................4 第二章人字形板式换热器的实验....................................................................................6 2.1实验设计方案................,.,.,.,.,.,...,..............,........................................,6 2.2数据处理................................................................................................................8 2.3实验结果..............................................................................................................10 2.4结论及误差分析.................................................................................................12 2.5本章小结..............................................................................................................12 第三章凝汽器的性能计算..............................................................................................13 3.1管壳式凝汽器的热力计算................................................................................13 3.2管壳式凝汽器的水力计算................................................................................15 3.3板式凝汽器的计算.............................................................................................16 3.3.1凝结传热系数的计算.................................................................................16 3.3.2壁温计算.....................................................................................................17 3.3.3板式凝汽器的阻力计算.............................................................................19 3.4本章小结..............................................................................................................20 第四章板式凝汽器的设计实例......................................................................................21 4.1板式凝汽器的设计计算过程............................................................................21 4.2板式凝汽器的设计结果....................................................................................23 4.2.ILT型宽宽板片的设计...............................................................................23 4.2.2人字形板片的设计.....................................................................................26华!匕电力大学硕士学位报告 4.3结果分析..............................................................................................................27 4.4本章小结..............................................................................................................32 第五章结论......................................................................................................................33