利用计算流体力学模拟技术对某水解酸化池的改进-沈鹏飞

第6卷第2期环境工程学报Vol．6，No．22012年2月ChineseJournalofEnvironmentalEngineeringFeb．2012利用计算流体力学模拟技术对某水解酸化池的改进沈鹏飞王红武*马鲁铭(同济大学城市污染控制国家工程研究中心，上海200092)摘要利用计算流体力学模拟技术，采用三维、稳态、k-ε紊流模型，结合多重参考系模型、弥散相模型及组分输运和化学反应模型，对江苏某污水处理厂水解酸化池进行了模拟。结果表明:水解酸化池内流速分布很不均匀;池内存在大片回流区域以及流速几乎为零的区域，区域总体积占池容的50%以上;平均水力停留时间约为1480s，远达不到设计值。结合模拟结果，提出了改进方案。改进后的模拟结果表明:水解酸化池内水流流速分布均匀性大大提高;大片的回流区域消失，速度几乎为零的区域面积也大大减小;水解酸化池的空间得到充分利用，水下推进器的作用也更加明显;平均水力停留时间约为15340s，和设计值十分接近。但是仍存在一些不足:水流流速分布的均匀性仍存在一定缺陷;只考虑了单相流，没有考虑池中污泥的作用。关键词计算流体力学(CFD)水解酸化池模拟改进中图分类号X703文献标识码A文章编号1673-9108(2012)02-0403-05ImprovementofahydrolysisacidificationpoolusingcomputationalfluiddynamicssimulationtechniqueShenPengfeiWangHongwuMaLuming(NationalEngineeringResearchCenterforUrbanPollutionControl，TongjiUniversity，Shanghai200092，China)AbstractAcertainhydrolysisacidificationpoolissimulatedbyemployingthecomputationalfluiddynam-ics(CFD)simulationtechniquebasedontheadoptionofthethree-dimensionalmodelundersteady，k-εturbu-lentstate，combinedwithothermodelssuchasmultiplereferenceframemodel，discretephasemodelandthemodelofspeciestransportandreaction．Theresultsshowthattheflowratedistributionisnon-uniform;thereex-istsmorethan50%ofthetotalpoolvolumeforthebigzoneofswirlingflowandthezoneofvirtuallyzeroflowve-locity．Theaverageresidencetimeforthewaterisabout1480s，whichisfarbelowthedesignedvalue．Withtheconsiderationofthesimulationresults，animprovementprogramisproposed．Simulationoftheproposedpro-gramindicatesthattheimprovementofflowratedistributionresultsfromthedisappearanceoftheswirlingflowandthegreatreductionofthezoneofvirtuallyzeroflowvelocity．Therefore，theeffectivespaceofthepoolisa-vailable，theunderwaterpropellerworksmoreefficientlyandtheaverageresidencetimeforthewaterthusrea-ches15340s，whichisveryclosetothedesignedvalue．However，considerationofsinglephaseflowonlyandtheignoranceofthesludgebehaviormayaffectthesimulationresultsofthedistributionuniformityoftheflowrate．Keywordscomputationalfluiddynamics(CFD);hydrolysisacidificationpool;simulation;improvement基金项目:国家水体污染控制与治