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···········································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·······································
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