化工原理列管式换热器设计_学位论文.doc

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1、列管式换热器设计说明书各专业全套优秀毕业设计图纸课程设计任务书设计一个列管式冷却器，冷却器的年处理能力为1.530×104t。将煤油液体从140℃冷却到40℃。冷却水的入口温度为30℃，出口温度为40℃。要求设计的换热器的管程和壳程的压降不大于100kPa。设计要求（1）换热器工艺设计计算（2）换热器工艺流程图（3）换热器设备结构图（4）设计说明14列管式换热器设计说明书目录一、前言································································3二、方案设计·····

2、···························································51、确定设计方案·····························································52、确定物性数据·····························································53、计算总传热系数···························································6

3、4、计算传热面积·····························································65、工艺结构尺寸·····························································66、换热器核算·······························································8三、设计结果一览表·················································

4、·········1114列管式换热器设计说明书三、对设计的评述····························································12四、参考文献································································12五、主要符号说明····························································13一、方案简介本设计任务是利用冷流体（水）给煤油降温。利用热传递过程

5、中对流传热原则，制成换热器，以供生产需要。下图（图1）是工业生产中用到的列管式换热器.14列管式换热器设计说明书选择换热器时,要遵循经济,传热效果优,方便清洗,复合实际需要等原则。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。它的结构简单、坚固、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基础。二、方案设计

6、某厂在生产过程中，需将煤油液体从140℃冷却到40℃。冷却器的年处理能力为19.8×104t。冷却水入口温度30℃，出口温度40℃。要求换热器的管程和壳程的压降不大于100kPa。试设计能完成上述任务的列管式换热器。14列管式换热器设计说明书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140℃，出口温度40℃冷流体。冷流体进口温度30℃，出口温度40℃。该换热器用循环水冷却，冬季操作时进口温度会降低，考虑到这一因素，估计该换热器的管壁温和流体壁温之差较大，因此初步确定选用带膨胀节的固定管板式换热器。（2）

7、流动空间及流速的确定由于循环冷却水较易结垢，为便于水垢清洗，应使循环水走管程，煤油走壳程。另外，这样的选择可以使煤油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ф25×2.5mm的碳钢管，管内流速取ui=1.2m/ｓ。2、确定物性数据定性温度：可取流体进口温度的平均值。壳程煤油的定性温度为：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。煤油在110℃下的有关物性数据如下：密度　　ρo=825kg/m3定压比热容　cpo=2.22kJ/(kg·℃)导热系数　　λo=0.14W/(m·℃)

8、粘度　　μo=0.000715Pa·s冷却水在35℃下的物性数据：密度　　ρi=994kg/m3定压比热容　cpi=4.08kJ/(kg·℃)导热系数　　λi=0.626W/(m·℃)粘度　μi=0.000725Pa·s3．计算总传热