权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Multi-Layered Type of Gas-to-Gas Heat Exchanger Provided with Self-Insulation Function

具有自保温功能的多层式气-气换热器的研制

基本信息

批准号：
13650227
负责人：
TOMIMURA Toshio
金额：
$ 2.24万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650227/
关键词：
Heat Exchanger Thermal Radiation Porous Medium Energy Conversion Thermal Insulation

项目摘要

In the academic year 2001, the multi-layered type of gas-to-gas heat exchanger was designed and fabricated, and fundamental data acquisition, development of simulation code, and investigation on effects of key parameters on the total and effective heat recovery rates and the outer wall temperature of the system were conducted. A series of experiments were performed under the conditions of the inlet gas temperature of the high temperature section T_<gho>=400〜600℃, the optical thickness of the porous metal plates τ_0=7.7, the thickness of the demister h=55mm, the walls with and without fins, and the mean working gas velocity u_m=0.15, 0.23m/s for two to five-layered heat exchanger structure. As a result, it has been clarified that, by adding the heat recovery section, the present heat exchanger is effectively insulated and at the same time good heat recovery rates are obtained, and even for T_<gho>=600℃, the total heat recovery rate of about 40% is attained by the five-layered structure. … More Further, a new calculation method for simulating the temperature distributions and 1he heat recovery rates of the system, which applies the spread sheet of Excel to the coupled equations of one-dimensional combined radiation and convection heat transfer, is proposed and is shown effective for practical calculation purposes.In the next academic year 2002, such important subjects as data acquisition under broader conditions, evaluations of heat transfer performance and unsteady state characteristics, and proposition of simple correlation equations were performed. The representative key parameters are T_<gho>= 300〜700℃, τ_0=0〜15.4, positions of the demister, and fin shape. From the experimental and theoretical studies, a lot of valuable findings have been obtained. Namely, the total heat recovery rate increases with the number of layer, the optical thickness of 8 is enough for obtaining sufficient heat recovery rates, fin design with high effective emissivity is required, walls with zigzag fins are effective for increasing heat recovery rates, position of the demister in the system needs to be decided by taking account of the flow conditions of working gas and emission and absorption of radiation energy, the porous metal plates exhibit good unsteady state characteristics and the transient response of the system is dominated by the main body and the walls of the heat exchanger, In addition, concerning the total heat recovery rate, simple correlation equations are proposed for the representative optical thickness of τ_0=0, 7.7. Less

2001学年，设计并制作了多层式气-气换热器，进行了基础数据采集、仿真程序开发以及关键参数对系统总热回收率、有效热回收率以及外壁温度的影响研究。针对二层至五层换热器结构，在高温段入口气体温度T_<gho>=400〜600℃、多孔金属板光学厚度τ_0=7.7、除沫器厚度h=55mm、壁面有翅片和无翅片、平均工作气速u_m=0.15、0.23m/s等条件下进行了一系列实验。结果表明，通过增加热回收段，本换热器可以有效隔热，同时获得良好的热回收率，即使在T_<gho>=600℃时，五层结构也能获得约40%的总热回收率。 … 更多此外，提出了一种模拟系统温度分布和 1he 热回收率的新计算方法，该方法将 Excel 电子表格应用于一维组合辐射和对流传热耦合方程，并在实际计算中显示出有效的效果。在下一个学年 2002 年，诸如更广泛条件下的数据采集、传热性能和非稳态特性的评估以及提出进行了简单的相关方程。具有代表性的关键参数有T_<gho>=300〜700℃、τ_0=0〜15.4、除沫器位置、翅片形状等。通过实验和理论研究，获得了许多有价值的发现。即总热回收率随着层数的增加而增加，8的光学厚度足以获得足够的热回收率，需要高有效发射率的翅片设计，锯齿形翅片的壁对于提高热回收率是有效的，除沫器在系统中的位置需要考虑工作气体的流动条件和辐射能的发射和吸收，多孔金属板表现出良好的非稳态特性和瞬态特性。系统的响应主要由换热器主体和壁面决定。此外，关于总热回收率，针对τ_0=0、7.7的代表光学厚度，提出了简单的相关方程。较少的