摘要换热器广泛应用于石油、化工、电力及能源等工业领域,以在工业领域应用较广的翅片管式换热器为研究对象,对甲醇蒸发器进行了设计计算研究。
对翅片的稳态导热进行了简要分析,并对管内的对流换热进行了深入分析,归纳了相应的计算式,把甲醇在翅片管内的蒸发过程分为单相液体的对流换热和沸腾换热两个过程,从而将甲醇蒸发器的设计过程分为两个部分来考虑,这样便于选用适用性强、准确度高的关联式,使蒸发器的设计更加合理。设计目标是对一给定基本设计参数的翅片管换热器进行了设计,完成相应的热力计算和结构计算。10935
关键词:甲醇;蒸发器;翅片管;设计
毕业设计说明书(论文)外文摘要
Title The design of the methanol evaporator
Abstract
The heat exchangers are widely used in the field of petroleum, chemical, electric power and energy industry. A research on design and calculation of finned tube heat exchanger which is widely used in the industrial field has been carried out.
The calculation formula is summarized through the brief analysis of steady-state heat conduction and the in-depth analysis of the convective heat transfer tube. The evaporation process of the methanol liquid inside the finned tube is pided into single-phase liquid flow heat exchanger and boiling heat transfer. The methanol evaporator design process is pided into two parts to consider. So it is easy to choose the associated type which is more applicability and highly accuracy .The design of the evaporator is more reasonable. The objective of paper is to design a finned tube heat exchanger which is given the basic design parameters and complete the thermal design and dimensioning calculation.
Key words: methanol, evaporator, finned tube, design
目录
1 引言 1
1.1 本课题的背景 1
1.2 本课题选用的翅片管式换热器的概述 1
1.2.1 国内外换热器发展现状 1
1.2.2 换热器设计的研究方向 2
1.2.3 换热器研究的意义 2
1.3 本文主要的研究工作 3
2 翅片管式换热器的传热及阻力计算 4
2.1 换热器设计计算的基本方法——平均温差法 4
2.2 换热器的传热热阻及翅片效率 4
2.2.1 换热器的传热热阻 4
2.2.2 翅片效率 6
2.3 整体式翅片管外表面的传热与阻力关系式 7
2.3.1 整体式翅片管外传热关系式 7
2.3.2 整体套片式翅片管的流动阻力 9
2.4 对流换热计算关系式 9
2.4.1 单相区对流换热计算关系式 9
2.4.2 制冷剂在管内的沸腾换热 11
3 设计计算实例 14
3.1 设计计算初始条件 14
3.1.1 设计要求 14
3.1.2 蒸发器系统流程 14
3.1.3 蒸发器结构的初步规划及几何参数计算 14
3.2 设计计算分区和设计流程 15
3.2.1 设计计算分区 15
3.2.2 设计流程 15
3.3 单相对流区换热 16 醚醇蒸发器设计+EES设计计算程序:http://www.751com.cn/huaxue/lunwen_10179.html