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Effective Method for Temperature Equalization of a Slab in Continuous Casting-Direct Rolling

连铸直轧板坯均温的有效方法

基本信息

批准号：
59850035
负责人：
ECHIGO Ryozo
金额：
$ 8.26万
依托单位：
Tokyo Institute of Technology
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 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850035/
关键词：
Process Saving and Energy Saving in Steel Industry Direct Rolling Slab Edge Heater Impinging Jet Radiative Heat Transfer 非定常流動伝熱

项目摘要

This study aims at clarifying heat transfer performances of a newly suggested temperature equalizer with the radiative converter for a slab in the continuous casting-direct rolling (CC-DR) process. The present temperature equalization is an application of the effective energy conversion method between gas enthalpy and thermal radiation by using porous media.Since the heat transfer system considered here is very complex owing to the conjugation of transient conductive, convective and radiative heat transfer, a fundamental study was carried out first by focusing attention on the the effect of convective heat transfer. On the basis of the numerically calculated laminar flow field around the slab, the transient heat conduction wihtin the slab was predicted. For the turbulent flow field which is of practical importance, the heat transfer experiment was conducted at a moderate temperature, and the systematic data for various conditions were accumulated.The high-temperature experiment was made by using the model temperature equalizer which is about one fifth of the actual one in dimensions. To simulate the CC-DR process in the experiment, the uniformly preheated model slab was cooled first by thermal radiation, and was subsequently fed into the temperature equalizer. By measurements of transient slab temperatures, it has proved that the radiative converter equalizes the slab temperature quickly owing to the local heating of the slab edge. Furthermore, the estimation of the overall energy balance in the temperature equalizer has demonstrated that efficient temperature equalization is feasible if the available energy flowing out of it is recovered.In addition to these investigations, the field tests were made and the feasibility of the present edge heater was discussed by Kinto in Daido Steel Co., Ltd. who has enough experience in designing the edge heater of CC-DR and in introducing the radiative converter into the working facilities.

本研究旨在阐明连铸-直接轧制(CC-DR)过程中板坯辐射转炉温度均衡器的换热性能。目前的温度均衡是利用多孔介质在气体热焓和热辐射之间的有效能量转换方法的应用，由于本文考虑的传热系统是非常复杂的，由于瞬时传导、对流和辐射换热的耦合，本文首先对对流换热的影响进行了基础性研究。在数值计算板坯层流流场的基础上，对板坯的瞬时导热进行了预测。对于具有实际意义的湍流流场，在中温条件下进行了换热实验，积累了各种条件下的系统数据，并利用尺寸约为实际温度均衡器五分之一的模型温度均衡器进行了高温实验。为了在实验中模拟CC-DR过程，先对预热均匀的模型板进行热辐射冷却，然后将其送入温度均衡器。通过对板坯瞬时温度的测量，证明了辐射转炉对板坯边缘的局部加热作用，使板坯温度迅速均衡。此外，温度均衡器的总体能量平衡估算表明，如果回收流出的有效能量，则有效的温度均衡是可行的。此外，还进行了现场试验，并讨论了现有边缘加热器的可行性，他在CC-DR边缘加热器的设计和将辐射转换器引入工作设施方面具有足够的经验。