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Research and Development of High Temperature and High Performance Plate-fin Compact Heat Exchanger with the Purpose of Reducing

以节能为目的的高温高性能板翅式紧凑型换热器的研发

基本信息

批准号：
59850036
负责人：
MORI Yasuo
金额：
$ 7.94万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1985
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850036/
关键词：
Plate-fin compact heat exchanger high temperature use twisted tape decrease of thermal stress

项目摘要

One of the most serious problems in the development of plate-fin compact heat exchangers at temperatures above 600゜C for advanced fuel cell or gas turbine plants, is mainly that brazed parts or the part of cover-plate connected to pipings is not strong enough due to thermal stress for practical use. In order to solve this problem, this study aims to make such a specific proposal as to install twisted tapes in the heat exchanger channels appropriate to decrease thermal stresses by giving uniform heated gas outlet temperature.In 1984, a study of flow and heat transfer performances in s square heated channel installed with various kinds of twisted tape was experimentally made below 300゜C and a plate-fin compact heat exchanger and its system was designed and the performance was tested. In 1985, first, by use of two kinds of channels of square and rectangular section of aspect ratio 2, flow and heat transfer performances up to 500゜C were experimentally obtained with the tapes with various width-pitch ratio and coated by black paint. Secondly, numerical calculations were made to obtain the optimum pitch ratio distribution of tapes installed in the channels of heat exchanger. By use of the twist-pitch distribution of tapes well approximating to the optomum one,experiments on temperature fields were made by use of an heat exchanger. A fairly good agreement was obtained between the experimental and predicted values. Thirdly, the other heat exchanger of brazed construction was made and tested. The numerical analyses of thermal stress were also made to make a comparison with the experimental results. It was shown by the experiment and the prediction that the maximum stress was found near the piping connecting part of the coverplate. Thus important and essential information for elevating the available temperature limit of the plate-fin compact heat exchanger was obtained

在先进的燃料电池或燃气轮机工厂中，600゜℃以上的板翅式紧凑型换热器的发展中最严重的问题之一是，由于热应力，连接管道的焊接件或盖板部分强度不够高。为了解决这个问题，本研究旨在提出这样一个具体的方案，即在适当的换热通道中安装扭带，通过均匀的受热气体出口温度来降低热应力。1984年，在300゜C以下，对安装了各种扭带的S方形加热通道内的流动和换热性能进行了实验研究，并设计了板翅式紧凑型换热器及其系统，并对其性能进行了测试。1985年，首先利用长径比为2的正方形和矩形两种通道，用不同宽节比的胶带和涂有黑色涂料的胶带，实验获得了高达500゜C的流动和换热性能。其次，进行了数值计算，得到了换热器通道内安装胶带的最佳间距比分布。利用胶带的扭距分布与最优扭距分布非常接近的特点，利用换热器进行了温度场实验。实验值与预测值之间有较好的一致性。再次，制作了另一种结构为钎焊结构的换热器，并进行了试验。并对热应力进行了数值分析，并与实验结果进行了比较。实验和预测表明，最大应力出现在盖板的管道连接处附近。从而获得了提高板翅式紧凑式换热器有效温度极限的重要信息。