第二章列管式换热器的设计计算···········································································第一节换热面积的估算···················································································

  第二节换热器及主要附件的试选···································································

  第三节换热器校核···························································································

  第三节设计计算的参数选择·········································································

  五、换热器设备应满足的基础要求·····················································

  第二节列管式换热器结构及基本信息参数·························································

  第四节设计结果一览表···················································································第三章设计总结、感想及有关问题分析讨论·······················································

  参考文献·······················································································································

  换热器(英语翻译:heat exchanger),是将热流体的部分热量给冷流体,使流体温度达到工艺流程规定的指标的热量交换设备,又称热交换器。

  图纸要求:用A3图纸绘制换热器一张:一主视图,一剖面图,两个局部放大图。

  第一章文献概要·······································································································第一节概述·····································································································

  (3)在列管式换热器中,壳程有挡板和没有挡板时,其对流传热系数的计算方式有何不同?

  (7)列管式换热器中,两流体的流动方向是怎么样确定的?比较其优缺点? (10)参考文献

  某炼油厂用柴油将原油预热。柴油和原油的有关参数如下表, 两侧的污垢热阻均可取1.72×10-4m2·K/W,换热器热损失忽略不计,管程的绝对粗糙度ε

  =0.1mm,要求两侧的阻力损失均不超过0.4×105Pa。试设计一台适当的列管式换热器。(y:学号后2位数字)

  根据列管式换热器的结构特点,大致上可以分为以下四种。以下根据本次的设计的基本要求,介绍几种常见的列管式换热器。

  这类换热器如图1-1所示。固定管办事换热器的两端和壳体连为一体,管子则固定于管板上,它的结余构简单;在相同的壳体直径内,排管最多,比较紧凑;由于这种结构式壳测清洗困难,所以壳程宜用于不易结垢和清洁的流体。当管束和壳体之间的温差太大而产生不同的热膨胀时,用使用管子于管板的接口脱开,从而发生介质的泄漏。

  2、设计目的:通过对列管式换热器的设计,达到让学生了解该换热器的结构特点,并能根据工艺技术要求选择适当的类型,同时还能根据传热的基础原理,选择流程,确定换热器的基本尺寸,计算传热面积和计算流体阻力。