论文总字数：15808字

摘 要

管壳式换热器在工业中有重要的应用。甚至于在我们平时的生产生活中，空气预热器都有着广泛的应用。本课题的研究目的是根据给定的数据，然后运用管壳式换热器的设计方法来设计一个螺纹槽管空气预热器。本课题首先对空气预热器的发展历史和研究的现状进行了介绍。上世纪以来，各种强化管就渐渐地取代了光管的地位。本文针对螺纹管的结构做了简要的说明，分析了其对流动的影响，即其工作原理，然后说明了螺纹槽管的参数对其传热特性和阻力特性的影响。在进行设计时，运用平均温差法，结合课题任务书给的原始数据来设计。原始数据有空气的进出口温度，烟气的进出口温度，以及空气在标准状况下的流量。用螺纹槽管代替光管设计了一个固定管板式的空气预热器。在对空气预热器进行热力计算后对该空气预热器进行了校验计算，最后计算了其总阻力降。至此该管壳式空气预热器的设计完成，然后依据完成的设计，运用CAD绘图软件绘制该空气预热器的图纸。在最后总结了管壳式空气预热器的设计过程，然后对本课题所设计的空气预热器的改进进行了展望。

关键词：固定管板式换热器；设计；螺纹管；空气；烟气

Abstract

Shell and tube heat exchanger has an important application in industry. Even in our daily life, air preheater is widely used. The purpose of this project is to design a spiral groove tube air preheater based on the given data and the design method of shell and tube heat exchanger. Firstly, this paper introduces the development history and research status of air preheater. Since the last century, all kinds of enhanced tubes have gradually replaced the status of light tubes. This paper gives a brief description of the structure of the threaded tube, analyzes its influence on the flow, that is, its working principle, and then explains the influence of the parameters of the threaded groove tube on its heat transfer and resistance characteristics. In the design, the average temperature difference method is used, combined with the original data given in the task book. The original data include the air inlet and outlet temperature, flue gas inlet and outlet temperature, and air flow under standard conditions. A fixed tube plate type air preheater is designed by using a threaded grooved tube instead of a smooth tube. After the thermal calculation of the air preheater, the air preheater was checked and calculated, and finally the total resistance drop was calculated. So far, the design of the shell and tube air preheater has been completed, and then according to the completed design, the drawings of the air preheater are drawn by CAD drawing software. Finally, the design process of shell and tube air preheater is summarized, and the improvement of the air preheater designed in this project is prospected.

Keyword：Fixed tubesheet heat exchanger；Design；Threaded pipe；atmosphere； exhaust gas

目录

摘要 I

Abstract II

目录 III

第一章 绪论 1

1.1研究背景与意义 1

1.2管壳式换热器 1

1.3螺纹管 2

1.3.1螺纹管结构 2

1.3.2螺纹管传热原理 2

1.3.3螺纹管的其它优点 3

1.4热交换器的设计 3

1.5研究前景 4

第二章 固定管板式热交换器的设计 5

2.1选择壳程流体和管程流体的分配 5

2.2 原始数据 5

2.3热力计算 5

2.3.1 计算烟气的定性温度 5

2.3.2 计算空气的定性温度 6

2.3.3计算实际空气流量 6

2.3.4 计算传热量 6

2.3.5计算烟气流量 7

2.3.6估算传热面积 7

2.4 结构设计计算 7

2.4.1 估算传热面积 7

2.4.2确定螺纹管的规格和管内烟气的流速 8

2.4.3选取管子的排列方式 9

2.4.4 选取壳体的内径 10

2.4.5 折流板 10

2.4.6接管 12

第三章 校验计算 13

3.1传热面积校验 13

3.1.1计算管侧换热系数 13

3.1.2计算壳程换热系数 13

3.1.3计算传热面积 14

3.2管壁温度的校核 15

3.3管程和壳程的压力降计算 15

3.3.1管程压力计算 15

3.3.2壳程总阻力计算 16

第四章 结构设计 18

4.1管束参数 18

4.2壳体 18

4.3 封头 18

4.4 接管 18

4.5 管箱法兰 19

4.6管板 19

4.7 其他零件 19

第五章 结论与展望 20

5.1 结论 20

5.2展望 20

参考文献 21

致谢 24

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