乙醇预热器的设计.doc

化工原理课程设计说明书题目:乙醇—水精馏塔预热器的设计学院:   海洋学院    班级:    食品本    姓名:   XXX X   学号:  11XXXXXXXX    指导老师:    XX     时间:  2014年6月 日  目录设计任务书··································································31、概述···································································4二、确定设计方案····························································51、参数的计算 ·····························································52、换热器型号的选取·························································83、传热排列方法及壳体内径···················································94、折流挡板·································································95、接管·····································································9三、总传热系数的核算·······················································101、管程核算··································································102、壳程核算·································································103、管壳程压力降核算··························································114、总传热系数核算对··························································13四、设计结果一览表···························································155、设计者心得体会···························································16六、主要参考文献····························································17七、主要符号说明·····························································17设计任务书本课程设计任务是乙醇——水预热器的设计。是利用塔釜液对原料液进行加温。设计数据及条件(1)生产能力:年处理乙醇—水混合液6000t(开工率300天/a,24h/d);(2)原料:乙醇含量为50%(质量)的常温25~35℃液体;(3)产品浓度/%(质量):94(4)%(质量);(5)%(质量)。(6)设备型式:列管式换热器;(7)允许压强降:管程压强降小于10kPa;壳程总压强降小于60kPa。物料流量kg/h组成(含乙醇量)摩尔分数温度℃操作压力       设计计算内容(1)传热面积、换热管根数;(2)确定管束的排列方式、管程数、挡板、隔板的规格和数量;(3)壳体的数量;(4)冷、热流体进、出口管径;(5)核算总传热系数;(6)管壳程流体阻力校核。设计成果(1)设计说明书一份;阐明设计特点,列出主要技术数据,对有关工艺流程和设备选型做出技术上和经济上的论证和平价。应按设计程序列出计算公式和计算结果;对所得物性数据很实用的经验公式图表应注明来历。(2)预热器的装配图一张(A1图纸)。一、概述换热器是化工、石油、食品及其他许多工业部门的通用设备,在生产中占有重要地位。由于生产规模、物料的性质、传热的要求等各不相同,故换热器的类型也是多种多样。按用途它可分为加热器、冷却器、冷凝器、蒸发器和再沸器等。使用最为广泛的列管式换热器把管子按一定方式固定在管板上,而管板则安装在壳体内。因此,这种换