升蒸汽的组成。Р***答案***Р(1) F=D+WР FXF=DXD+WXWР F=(1×(0.90-0.02))/(0.6-0.02)=1.517Р (2) Xe=XF=0.06Р y1=αX1/((1+(α-1)X1)=0.818Р Rmin=(Xd-ye))/(ye-Xe)=0.376Р R/Rmin=4Р (3) y1=X=0.90Р y1=αX1/(1+(α-1)X1)Р X1=0.75Р yn+1=(1.5/2.5)Xn+0.9/2.5=0.6Xn+0.36Р y=0.81Р3.(15分)在一连续干燥器中干燥盐类结晶,每小时处理湿物料为1000kg, 经干燥后物料的含水量由40%减至5%(均为湿基),以热空气为干燥介质,初始湿度H1为0.009kg水/kg绝干气,离开干燥器时湿度H2为0.039kg水/kg绝干气,假定干燥过程中无物料损失,试求:(1)水分蒸发量W(kg水/h);(2)空气消耗量L(kg绝干气/h);原湿空气消耗量L(kg原空气/h);(3)干燥产品量G2(kg/h)。Р***答案***Р(1)水分蒸发量WР x1=w1/(1-w1)Р =0.40/(1-0.40)Р =0.667 kg水/kg绝干料Р x2=w2/(1-w2)Р =0.05/(1-0.05)Р =0.053 kg水/kg绝干料Р Gc=G1(1-w1)Р =1000(1-0.40)Р =600 kg绝干料/hР ∴W=Gc(x1-x2)Р =600×(0.667-0.053)Р =368.4 kg水/hР(2)L=W/(H2-H1)Р =368.4/(0.039-0.009)Р =12280 kg绝干气/hР L2=L(1+H1)Р =12280(1+0.009)Р =12390.5 kg原空气/hР(3)G2=G1-WР =1000-368.4=631.6 kg/h
全文预览
