非化工原理课程设计列管式换热器设计.docVIP

非化工原理课程设计列管式换热器设计 ———————————————————————————————— 作者： ———————————————————————————————— 日期： 列管式换热器设计说明书 设计者： 班级： 姓名 ： 学号 ： 日期 ： 指导教师 设计成绩 日期 目录 一、方案简介································································3 方案设计································································4 确定设计方案·····························································4 确定物性数据·····························································4 计算总传热系数···························································4 计算传热面积·····························································5 工艺构造尺寸·····························································5 换热器核算·······························································7 设计结果一览表··························································10 对设计的评述····························································11 附图〔主体设备设计条件图〕〔详情参见图纸〕································· 参考文献································································12 主要符号说明····························································12 附图·········································································· 一、方案简介 本设计任务是利用冷流体〔水〕给硝基苯降温。利用热传递过程中对流传热原那么，制成换热器，以供生产需要。下列图〔图1〕是工业生产中用到的列管式换热器. 选择换热器时,要遵循经济,传热效果优,方便清洗,复合实际需要等原那么。换热器分为几大类：夹套式换热器，沉浸式蛇管换热器，喷淋式换热器，套管式换热器，螺旋板式换热器，板翅式换热器，热管式换热器，列管式换热器等。不同的换热器适用于不同的场合。而列管式换热器在生产中被广泛利用。它的构造简单、巩固、制造较容易、处理能力大、适应性大、操作弹性较大。尤其在高压、高温和大型装置中使用更为普遍。所以首选列管式换热器作为设计根底。 二、方案设计 某厂在生产过程中，需将硝基苯液体从93℃冷却到50℃。处理能力为1×105吨/年。冷却介质采用自来水，入口温度27℃，出口温度37℃。要求换热器的管程和壳程的压降不大于10kPa。试设计能完成上述任务的列管式换热器。〔每年按300天，每天24小时连续运行〕 1．确定设计方案 〔1〕选择换热器的类型 两流体温度变化情况： 热流体进口温度93℃，出口温度50℃冷流体。 冷流体进口温度27℃，出口温度37℃。 从两流体温度来看，估计换热器的管壁温度和壳体壁温之差不会很大，因此初步确定选用固定管板式换热器。 〔2〕流动空间及流速确实定 由于硝基苯的粘度比水的大，因此冷却水走管程，硝基苯走壳程。另外，这样的选择可以使硝基苯通过壳体壁面向空气中散热，提高冷却效果。同时，在此选择逆流。选用ф25×2.5的碳钢管，管内流速取ui=0.5m/ｓ。 2、确定物性数据 定性温度：可取流体进口温度的平均值。 壳程硝基苯的定性温度为： 管程流体的定性温度为： 根据定性温度，分别查取壳程和管程流体的有关物性数据。 硝基苯在℃下的有关物性数据如下： 密度　　 ρo=1154 kg/m3 定压比热容　 cpo=kJ/(kg·℃) 导热系数　　 λo=××10-5＝0.129 W/(m·