NaOH水溶液蒸发装置的设计-中央循环管式蒸发器

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····················································4 三、蒸发操作的特点····················································4 四、蒸发设备··························································4 五、蒸发器选型························································5 第二节 工艺流程草图···························································5

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

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（一）各效由于溶液的蒸汽压下降所引起的温度差损失 ···············6

（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···········································13 五、接管尺寸的确定···················································14

(一)溶液的进出口················································14 （二）加热蒸气进口与二次蒸汽出口 ································14 （三）冷凝水出口·················································14

第五节 蒸发装置的辅助设备····················································14

一、气液分离器························································14 二、蒸汽冷凝器························································15

（一）冷却水量·Vl···············································15 （二） 冷凝器的直径···············································16 （三）淋水板的设计················································16

第六节 主要设备强度计算及校核················································17

一、蒸发分离室厚度设计···············································17 二、加热室厚度校核···················································18

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