套管式换热器课程设计

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1、成绩大连民族学院工程原理课程设计说明书题目：果汁冷却器的设计设计人：李系别：生物工程班级：084指导教师：刘俏老师设计日期2010.11.12~12.4目录设计任务书·······························································1一、方案简介·····························································2二、方案设计········································

2、·····················31.确定设计方案····························································32.确定物性数据····························································33.基本量计算······························································34.工艺结构尺寸·······················

3、·····································45.换热器核算······························································4三、设计结果一览表·······················································8四、设计过程中的体会·····················································9五、参考文献··················

4、···········································10六、主要符号说明·························································11七、Keywords····························································12设计任务书（一）设计题目果汁冷却器的设计。（二）设计任务及操作条件（1）处理能力1980吨/年（2）设备形式套管式换热器（3）操作条件①果汁：入口温度75

5、℃，出口温度20℃。②冷却水：入口温度6℃，出口温度16℃。③允许压降：不大于1MP④每年按330天计，每天24小时继续运行。（三）设计要求选择适宜的套管式换热器并进行核算。画出工艺设备图及列管布置图。11一、方案简介本设计任务是利用冷流体（水）给果汁降温。利用热传递过程中对流传热原则，制成换热器，以供生产需要。下图（图1）是工业生产中用到的套管式换热器。通常，热流体（A流体）由上部引入,而冷流体（B流体）则由下部引入。套管中外管的两端与内管用焊接或法兰连接。内管与U形肘管多用法兰连接,便于传热管的清洗和增减。每程传

6、热管的有效长度取4～7米。这种换热器传热面积最高达18米2,故适用于小容量换热。当内外管壁温差较大时,可在外管设置U形膨胀节（图中b）或内外管间采用填料函滑动密封（图中c）,以减小温差应力。管子可用钢、铸铁、陶瓷和玻璃等制成,若选材得当,它可用于腐蚀性介质的换热。选择换热器时,要遵循经济,传热效果优,方便清洗,符合实际需要等原则。换热器分为几大类：夹套式换热器，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，列管式换热器等。套管式换热器的主要结构是由两种大小不同的标准管组成的同轴套管。它的程数可以根据所需传

7、热面积大小随意增减，套管式换热器适合于高温、高压、小流量流体的传热，它具有较高的总传热系数，除此之外，它还有耐高温、结构简单，制造方便、传热面积易于调整等优点。11二、方案设计1．确定设计方案由于果汁的黏度比水的大，水的对流系数一般较大，且易结垢，因此冷却水走内管，果汁走外管，这样的选择可以使果汁通过壳体壁面向空气中散热，提高冷却效果。2、确定物性数据定性温度：可取流体进口温度的平均值。外管果汁的定性温度为：内管流体的定性温度为：根据定性温度，分别查取外管和内管流体的有关物性数据。果汁在47.5℃下的有关物性数据如下

8、：密度　　ρo=1080kg/m3定压比热容　cpo=3.187kJ/(kg·℃)导热系数　　λo=0.559W/(m·K)黏度　　μo=0.0015Pa·s冷却水在11℃下的物性数据：密度　　ρi=999.7kg/m3定压比热容　cpi=4.191kJ/(kg·℃)导热系数　　λi=0.5745W/(m·℃)黏度　　　　μi=0.001271