U型管换热器的设计说明书.doc

学号： 毕业设计说明书 U型管换热器设计 U tube heat exchanger design 学院 机电工程学院 专业 化工设备与机械 班级 学生 指导教师（职称） 完成时间 年 月日至 年 月 日 摘要 换热器是许多工业部门广泛应用的工艺设备。设计中考虑操作条件及介质的特性，本设计采用U型管式换热器结构。该设备适用于温差不大，壳程流体清洁，不易结垢拆卸、清洗的场合。在设计过程中，依照GB151-1999《钢制U型管式换热器》对换热器依次进行工艺计算、结构设计（材料选型）、强度计算，最后完成专题讨论。其中在强度计算中，根据温差具体的数值，对膨胀节的需要进行计算。本设计每层管子排列方式采用正三角形排列，这种方法在相同的管板面积上可排较多的管子，且管外表面传热系数大。但由于是双管程结构，所以在分程隔板两边采用矩形排列。最后经检测该台换热器是否满足介质换热的需要。 关键词：换热器；U型管式；工艺设计；结构设计；强度计算 ABSTRACT The heat exchanger is the techniques equipment widely used in many industrial departments. In the design it uses the fixed tube plate type of the heat interchanger structure,because of the operating condition and the medium characteristic. This equipment is suitable when the temperature difference is not big,the shell regulation fluid is clean,or the fraze,disassembling or cleaning for the heat exchanger is not easy. In the process of the design,the technological design,the structural design(material shaping) and the strength calculation must according to the GB151-1999Steel SystemShell Type Heat interchanger,finally it completes the seminar. In the strength calculation,it must be computed for the require of the part of inflates according to the difference concrete value ot the temperature.In the design the way of each pipe arrangement uses the equilateral triangle arrangement,this method may arrange many pipes in the same tube plate area,also the tube outside surface heat transfer coefficient is big. But because the structure is two barrel regulation, it uses the rectangular arrangement at the both sides of the partition board. Finally it be difined that the heat interchanger whether satisfies the need of the medium heat transfer. Key words: heat exchanger；fixed tube plate；technological design; structural design； strength calculation  目 录 摘要 I ABSTRACT II 前 言 1 第一章 绪论 2 1．1 换热器的应用及其发展 2 1．2 换热器的分类及其特点 5 1．3 U型管式换热器的设计 7 第二章 换热器的工艺计算 8 2．1 设