管壳式换热器（课程设计）.docx

化工原理课程设计说明书 PAGE \* MERGEFORMAT17 目录 前言 ················································2 第一部分，甲苯冷凝器的设计 设计任务···········································4 设计要求·········································· 4 工艺结构尺寸·······································6 管径和管内流速·······························6 管程数和传热管数·····························6 平均传热温差校正及壳程数·····················6 传热管的排列和分程数法·······················7 壳体内径·····································7 换热器主要传热参数核算·····························8 （1）计算管程对流传热系数··························8 （2）计算壳程对流传热系数··························8 （3）确定污垢热阻··································9 （4）总传热系数····································9 第二部分，甲苯冷却器的设计 试算并初选换热器规格·······························11 流体流动途径的确定···························11 确定流体的定性温度、物性数据，并选择列管换热 器的型式·····································11 计算总传热系数···································· 11 计算热负荷···································11 冷却水用量···································12 计算平均传热温度差···························12 总传热系数K·································12 估算换热面积·································12 工艺结构尺寸·······································12 管径和管内流速································12 管程数和传热管数······························12 平均传热温差校正及壳程数······················13 传热管的排列和分程方法························14 壳体内径······································14 换热器主要传热参数核算 ·····························15 壳程对流传热系数 · ····························15 管程对流传热系数 · ····························16 基于管内表面积的总传热系数 · ··················16 计算面积裕度· ································17 化工原理课程设计任务书 设计任务题目 ＃＃．＃万吨/年 甲苯精馏塔冷凝冷却(水冷) 换热系统工艺设计。 任务给定条件 热流条件： 流量为10500kg/h的甲苯蒸汽从120℃，0.14 MPa(绝压)冷凝到120℃，0.14 MPa(绝压) 甲苯液，再冷却到30℃；120℃甲苯汽相热焓 140 Kcal/Kg，液相焓53 Kcal/Kg，30℃甲苯液相焓13 Kcal/Kg ；定性温度80℃时甲苯密度810Kg/m3 , 比热 0.446(Kcal/Kg. ℃) 绝对粘度0.32(cp) ，比热0.104 (Kcal/(m.h. ℃)) 冷流条件 新鲜水初始温度25℃，循环水初始温度45℃，换热后水温升15℃。水的物性数据由化原上册附录查取。 管壳式换热器类型提示 设计压力1.6MPa，要求管程和壳程的压降不大于30kPa，冷凝采用浮头式，冷却采用固定管板式管壳式换热器。 设计要求 每个设计者必须提交设计说明书和冷凝冷却系统工艺流程图(A3)。 1．设计说明书必须包括下述内容： 封面、目录、设计任