论文总字数：15028字

摘 要

热管一种常用的的传热元件,利用热管原理实现热交换的换热器称之为热管式换热器。由于其结构简单、抗露点腐蚀能力强、换热效率高、抗灰堵能力强等优点，热管换热器越来越受到人们的重视，而且也是一种应用前景非常好的换热设备。目前，它被广泛应用于动力、化工、冶金、电力、计算机等领域。

我的这篇论文就热管换热器的发展现状、趋势、设计以及应用做了一个简要的论述和研究，着重探讨了热管换热器的设计。在讨论热管换热器的设计过程中，主要针对其热力计算、设备结构计算、元件参数的选择做了一个合理构建，并结合已知参数和相关文献设计出了热管式换热器的基本模型来展现出来。

关键词：热管 热管换热器 结构参数 设计计算 

20000Nm3 Heat Exchanger used

for Exhaust Heat Recovery

Abstract

Heat pipe one of the common heat transfer components, which is called a heat pipe heat exchanger, is called a heat exchange exchanger by heat pipe principle.. Because of its structure simple, dew point corrosion resistant ability strong, high heat exchange efficiency, anti dust blocking ability, heat pipe for heat exchanger is attracting more and more attention, but also a prospect is very good for thermal equipment. At present, it is widely used in power, chemical, metallurgy, power, computer and other fields..

In this paper, the development status, trend, design and application of heat pipe heat exchanger are briefly discussed and studied. The design of heat pipe heat exchanger is discussed.. Discussion heat pipe for heat exchanger design process, mainly for the thermodynamic calculation, equipment structure calculation, selection of element parameters do a reasonable construction, and combined with the known parameters and relevant literature design the heat pipe exchanger the heat exchanger of the basic model to show up.

Key words: Heat pipe; Heat pipe heat exchanger; Structural parameters; Design calculation

目 录

摘要…………………………………………………………………………………I

ABSTRACT………………………………………………………………………II

第一章 绪论………………………………………………………………………1

1.1 烟气预热回收系统…..……..…..……………………………..………1

1.2 热管换热器的工作原理….…………………………………...………2

1.3 热管烟气换热器存在的问题…….……………………………...……2

1.3.1 气流均匀分布问题 ……………………………………..……2

1.3.2 烟气中粉尘沉积问题……………………………………..……3

1.3.3 低温腐蚀问题………………………………………………..…3

1.4 热管烟气回收换热器应用范围………………….…..........................3

1.5热管换热器的经济性能………………………………………………3

1.6热管换热器回收烟气余热发展前景……………...………………….4

第二章20000Nm3烟气余热回收换热器……………………….…………5

2.1设计题目………..…….………………………………………………5

2.2 原始数据.…….…..…..………………………………………………5

2.3 热力设计………… ….………………………………………………5

2.3.1热管原件的基本选择..………………………...………………5

2.3.2计算传热量Q……..………………..………….………………5

2.3.3冷空气出口温度t₂^c及对数平均温差_m……….....…………6

2.3.4确定迎风面积及迎风面管排数B…..…...….....…………7

2.3.5求总传热系数…………..…..……………….….….………7

2.3.6求加热侧总传热面积A_H^h……….……….……...……………9

2.3.7求所需热管数n………………...……………………………10

2.3.8求换热器纵深排数m…………..……………………………10

2.3.9求通过热管换热管的压力降…..……………………………10

2.3.10求热管的第一排的管内流体温度t_v………………………11

2.3.11求蒸发段热管的末排管壁温度t_w^h………..………………13

2.4热管设计………...……………………………………………………16

2.4.1热管工作温度..………………...……………………………17

2.4.2热管工质选择………...………..……………………………17

2.4.3热管材料选择……………...…..……………………………18

2.4.4热管封头设计……………………..……...…………………18

2.4.5热管传热极限影响…………………………….……………19

2.5结构设计………...……………………………………………………19

结语………………………………………………………………………………… 22

参考文献 ………………………………………………………………………… 23

主要符号表 ………………………………………………………………………25

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