三效蒸发器的设计.doc

化工原理课程设计 –––––三效蒸发器的设计 南通大学化学化工学院 轻化工程073 目 录 符号说明·····································································2 第一节 概述·································································3 一、蒸发及蒸发流程··················································3 二、蒸发操作的分类··················································3 三、蒸发操作的特点··················································3 四、蒸发设备························································3 五、蒸发器选型· ·······················································4 第二节 蒸发装置设计任务 ····················································4 一、设计题目· ·····················································4 二、设计任务及操作条件···············································4 第三节 三效蒸发器得工艺计算·················································5 一、估计各效蒸发量和完成液浓度······································5 二、估计各效溶液的沸点和有效总温差··································6 （一）各效由于溶液的蒸汽压下降所引起的温度差损失/ ···············7 （二）各效由于溶液静压强所因引起的温度差损失· ··················7 （三）流体阻力产生压降所引起的温度差损失 ······················8 （四）各效料夜的温度和有效总温差· ································8 三、加热蒸汽消耗量和各效蒸发水量的计算·······························8 四、蒸发器的传热面积的估算 ··········································9 五、有效温差的再分配················································10 六、重复上述计算步骤 ·············································10 （一）计算各效溶液浓度 ··········································10 （二）计算各效溶液沸点 ···········································10 （三）各效焓衡算 ·················································11 （四）蒸发器传热面积的计算 ·······································12 七、计算结果·························································12 第四节 蒸发器的主要结构尺寸计算 一、加热管的选择和管数的初步估计·····································12 二、循环管的选择·····················································13 三、加热室直径及加热管数目的确定·····································13 四、分离室直径与高度的确定··········