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第十三章：干燥

通过本章的学习，应熟练掌握表示湿空气性质的参数，正确应用空气的H–I图确定空气的状态点及其性质参数；熟练应用物料衡算及热量衡算解决干燥过程中的计算问题；了解干燥过程的平衡关系和速率特征及干燥时间的计算；了解干燥器的类型及强化干燥操作的基本方法。

二、本章思考题

1、工业上常用的去湿方法有哪几种？ 态参数？

11、当湿空气的总压变化时，湿空气H–I图上的各线将如何变化? 在t、H相同的条件下，提高压力对干燥操作是否有利? 为什么?

12、作为干燥介质的湿空气为什么要先经预热后再送入干燥器？

13、采用一定湿度的热空气干燥湿物料，被除去的水分是结合水还是非结合水？为什么？

14、干燥过程分哪几种阶段？它们有什么特征？ 15、什么叫临界含水量和平衡含水量？ 16、干燥时间包括几个部分？怎样计算？

17、干燥哪一类物料用部分废气循环？废气的作用是什么？

18、影响干燥操作的主要因素是什么？调节、控制时应注意哪些问题？

三、例题

例题13-1：已知湿空气的总压为101.3kN/m2 ,相对湿度为50%，干球温度为20o C。试用I-H图求解：

(a)水蒸汽分压p； (b)湿度Ｈ；

(c)热焓Ｉ； (d)露点td ； (e)湿球温度tw ；

(f)如将含500kg/h干空气的湿空气预热至117oC，求所需热量Ｑ。 解 ：

由已知条件：Ｐ＝101.3kN/m2，Ψ0＝50%，t0=20o C在I-H图上定出湿空气的状态点Ａ点。

(a)水蒸汽分压p

过预热器气所获得的热量为

每小时含500kg干空气的湿空气通过预热所获得的热量为

例题13-2：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-1绝干气，离开干燥器时湿度H2为0.039kg水•kg-1绝干气，假定干燥过程中无物料损失，试求：

（1） 水分蒸发是qm,W （kg水•h-1）； （2） 空气消耗qm,L（kg绝干气•h-1）；

原湿空气消耗量qm,L’（kg原空气•h-1）；

（3）干燥产品量qm,G2（kg•h-1）。 解：

qmG1=1000kg/h, w1=40℃, w2=5% H1=0.009, H2=0.039

qmGC=qmG1(1-w1)=1000(1-0.4)=600kg/h x1=0.4/0.6=0.67, x2=5/95=0.053

①qmw=qmGC(x1-x2)=600(0.67-0.053)=368.6kg/h ②qmL(H2-H1)=qmw

qmLqmw368.612286.7

H2H10.0390.009qmL’=qmL(1+H1)=12286.7(1+0.009)=12397.3kg/h ③qmGC=qmG2(1-w2) ∴qmG2

qmGC600631.6kg/h

1w210.05