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1、20xx 届 毕 业 设 计（论文）学生姓名： xxx 学 号： 所在学院： 专 业： 设计(论文)题目: 浮头式对二甲苯冷却器的设计 指导教师： 2012 年 X 月 浮头式对二甲苯冷却器的设计摘要各种类型的换热器作为工艺过程重要的设备，广泛应用于石油化工、医药、冶金、制冷等部门。换热器应按照工艺参数及条件进行设计，满足特定工况和苛刻操作条件的要求。管壳式换热器具有结构坚固、操作弹性大、可靠程度高、使用范围广等优点，所以在工程中仍得到普遍使用。采用HTFS软件进行换热器工艺设计已很普遍，但为了使设计出来的换热器能更好地满足各种工况，仍然有许多方面需在设计时加以充分考虑。本文是对浮头式对二甲苯
2、冷却器的设计，其主要研究内容和结论如下：设计一台浮头式对二甲苯冷却器，首先进行冷却器的工艺设计，确定选用的管壳式换热器的类型、换热器的管型、流体的走向和流向、确定相关的冷却介质，最后给出相关的理由。对二甲苯的性质对于工艺设计有一定的影响，而工艺设计的结果又可能直接影响到后期的热力计算和制图，所以如何正确的做出选择，需要查询一定量的国标和文献。然后对于对二甲苯的物性参数的查询，通过实用热物理性质手册查询对应状态下的对二甲苯的物性参数。处理完基本数据，接着对冷却器进行结构的设计，初定换热系数，选择合适的管子尺寸，算的换热面积，冷却器管程和壳程的相关结构尺寸，包括这流管尺寸、管子长度、接管直径等。壳
3、程的尺寸通过管子的排布而确定，管子的布置尽量要均匀合理，以免导致受热不均引起的应力。接着进行冷却器的热力计算。根据壳程和管程的传热系数，结合相关热阻和相关影响因素，算出系统总传热系数。然后根据水和对二甲苯的污垢热阻算出管程和壳程阻力。本论文所做的工作是对浮头式对二甲苯冷却器设计的准备工作和设计计算的一整套过程，分析并研究冷却器设计过程中相关注意点，并怎样通过改变相关变量来提高冷却器的性能，为日后冷却器的相关设计研究提供了一定的理论基础。关键词：浮头式 对二甲苯 管壳式换热器 冷却器 The Design of floating head p-xylene coolerAbstractAs pr
4、ocess equipment, all types of heat exchangers are widely used in petrochemical, pharmaceutical, metallurgy, refrigeration and other departments. The heat exchanger should be designed in accordance with the process parameters and conditions to meet the requirements of the specific conditions and hars
5、h operating conditions. Shell and tube heat exchanger has a solid structure, flexible operation, high degree of reliability, the use of a wide range, so is still widely used in engineering. HTFS software process design of heat exchangers has become commonplace, but in order to make the design of hea
6、t exchangers can better meet the needs of a variety of conditions, there are still many aspects need to be fully considered in the design.This article is the design of the floating head p-xylene cooler, and its main contents and conclusions are as follows:Design a floating head p-xylene cooler ,dete
7、rmine the selection of shell and tube heat exchanger type of heat exchanger tube, the fluid toward and direction to determine the cooling medium. Finally, giving related reasons. Have a certain impact on the p-xylene nature of the process design, process design results may have a direct impact on th
8、e thermodynamic calculation and mapping of late, so how to make a choice, you need a certain amount of GB and literature, will be a difficulty. For inquiries on the physical parameters of the p-xylene, the corresponding physical parameters of p-xylene in the state ok Practical Thermal Physical Prope
9、rties Of Manual Queries. Deal with the basic data, then the cooler design of the structure, an initial heat transfer coefficient, and select the appropriate pipe size, count the heat transfer area, cooler tube side and shell side of the structure size, including the flow tube size, pipe length, diam
10、eter, to take over. The size of the shell determined by the arrangement of the tubes, the layout of the pipe as far as possible should be uniform and reasonable so as not to cause the stress caused by the uneven heating. Followed by a cooler thermal calculation. According to the shell and tube heat
11、transfer coefficient, and the related thermal resistance and related factors to calculate the overall heat transfer coefficient. Then calculated according to the fouling resistance of the tube side and shell side.The work done in this paper is on the preparatory work of a floating head the p-xylene
12、cooler design and design calculations of a set of processes, attention to points in the process of analysis and the cooler design, and how by changing the relevant variables to improve the cooler performance provides a theoretical basis.Key words: Floating Head, P-xylene, Shell And Tube Heat, Cooler目 录摘 要.ABSTRACT.第一章 绪 论.1 1.1 课题背景.1 1.2 国内外发展及研究动态.1 1.2.1 理论研究.1 1.2.2 实验研究.5 1.2.3设计方法研究.7 1.3 课题研究的意义.7第二章 热力计算.8 2.1 流体走向选择.
