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1、本科机械毕业设计论文CAD图纸QQ401339828摘要本设计为蒸发水量为1750Kg/h的节能型中药厂中草药浸出液蒸发系统设计。在中草药生产过程中,双效蒸发设备是常用的。在设计中对双效蒸发的工艺流程、蒸发器、分离器、离心泵等设备进行了选择和计算。在设计蒸发过程中考虑到了节能问题,本设计采用二次蒸汽对下一效进行加热,并利用末效蒸汽对物料进行预热,此外还在流程当中加入了预热器等附属设备,以便节能。和大多数工艺设计一样,双效蒸发的合理设计依赖于蒸发的基本原理和一些经验公式。按照蒸发的基本原理,计算出双效降膜蒸发器的基本参数,根据基本参数进行物料恒算、热量恒算、工艺流
2、程计算等。在文中对双效降膜蒸发系统做了比较详细的设计和计算,引用了部分国内外先进的技术。为了使料液能均匀进入每根管并形成连续均匀成膜,把每根换热管的上端设置一个分配头的结构,也可以采用分配板,其分布孔与管子间距相同,呈等距布置方式,使分布孔与管子中心错开,避免料液落在孔中自由落下,达不到成膜的目的。关键词:中草药浸出液;双效蒸发;冷凝器;工艺设计29本科机械毕业设计论文CAD图纸QQ401339828AbstractThedesignfortheevaporationofwater,1750Kg/hofenergy-efficientChineseherbalm
3、edicineinthepharmaceuticalleachateevaporationsystem.InChineseherbalmedicineproductionprocess,double-effectevaporationequipmentiscommonlyused.Inthedesignofthedouble-effectevaporationprocess,evaporator,separator,centrifugalpumpsandotherequipmentwereselectedandcalculated.Evaporationinth
4、edesignprocesstookintoaccounttheenergyproblems,thisdesignusesasecondarysteamtoheatthenexteffect,anduseeffectivelytheendofsteam,preheatingthematerial,inadditiontoprocesseswhichalsojoinedthepre-heaterandotherauxiliaryequipmentforenergysaving.Andmostofthedesignprocess,astherationaldesig
5、nofdouble-effectevaporationdependsontheevaporationofthebasicprinciplesandsomeempiricalformula.Inaccordancewiththebasicprincipleofevaporationtocalculatethedouble-effectfallingfilmevaporatorofthebasicparametersofthebasicparametersofmaterialsunderconstantcalculation,theheatconstantcalcu
6、lation,processcalculation.Inthetextofthedouble-effectfallingfilmevaporationsystemtodoamoredetaileddesignsandcalculations,citedsomeoftheadvancedtechnology.Inordertofeedliquidtoevenlyintoeachrootcanalandformacontinuousuniformfilm,theheatexchangetubesoftheupperpartofeachheadofadistribut
7、ionstructure,distributionboardscanalsobeused,thedistributionofthesameholeandtubespacing,wereisometriclayouttodistributioncenterholeandstaggeredtubes,toavoidholesinthefreefeedsolutionfallsdown,notuptothepurposeoffilm.Keywords:FurfuralWastewater;Double-effectEvaporation;Condenser;Proce
8、ssDesign29本科