单效蒸发器蒸发计算方式

为101.3KPa。解:(1)水份蒸发量Wkg/h(2)加热蒸汽消耗量故由本书查附录得:当P=0.3 MPa(表)时,T=143.5℃,r=2137.0kJ/kg当Pc=51KPa(真空度)时,Tc'=81.2℃r'=2304 kJ/kg故kg/h)1(10xxFW??6.158)483.01.01(2000????rQWrDL'???DrQ05.0L?rWrD95.0'?1800213795.023041586????D多效降膜蒸发器专业生产商——安徽奥森机械设备有限公司地址:合肥市双凤经济开发区双凤大道联系电话:13956042700网址)传热面积A①确定溶液沸点a)计算已查知Pc=51kPa(真空度)下,冷凝器中二次蒸汽的饱和温度Tc'=81.2℃查附录常压下48.3% NaOH溶液的沸点近似为tA=140℃∴Δ常'=140-100=40℃因二次蒸汽的真空度为51 kPa,故需用式(4—10)校正,即∴=0.87×40=34.8℃b)计算由于二次蒸汽流动的压降较少,故分离室压力可视为冷凝器的压力。则kPa查附录得72 kPa下对应水的沸点为90.4℃c)=1℃则溶液的沸点t=Tc'+++=81.2 + 34.8 + 9.2 + 1=126.2℃②总传热系数已知K=1500 W/m2?K③传热面积由式(5—7a)、(5—8)和(5—9)得蒸发器加热面积为:=36.3 m213.115861800??WD'?'?')273'(0162.02rTf??87.02304)2732.81(016.02???'?''?2'avavghPP???2381.9150050????722250???'''?'?''?'''?)(1mtTKDrtKQA????)2.1265.143(1500360010213715863??????36003.17150010213715863?????