熔渣颗粒空冷相变换热的三维数值模拟

doi:10.3969/j.issn.0438-1157.2014.z1.055

化工学报 ›› 2014, Vol. 65 ›› Issue (S1): 340-345.DOI: 10.3969/j.issn.0438-1157.2014.z1.055

熔渣颗粒空冷相变换热的三维数值模拟

邱勇军^1,2, 朱恂^1,2, 王宏^1,2, 廖强^1,2

1. 重庆大学低品位能源利用及系统教育部重点实验室, 重庆 400030;
2. 重庆大学工程热物理研究所, 重庆 400030

收稿日期:2014-02-24 修回日期:2014-03-04 出版日期:2014-05-30 发布日期:2014-05-30
通讯作者: 朱恂
基金资助:
国家重点基础研究发展计划项目（2012CB720403）。

Three-dimensional simulation of solidification and heat transfer for air-cooling molten blast furnace slag droplet

QIU Yongjun^1,2, ZHU Xun^1,2, WANG Hong^1,2, LIAO Qiang^1,2

1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China;
2. Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Received:2014-02-24 Revised:2014-03-04 Online:2014-05-30 Published:2014-05-30
Supported by:
supported by the National Basic Research Program of China (2012CB720403).

摘要/Abstract

摘要： 利用VOF方法结合凝固和熔化模型对熔渣颗粒在空气流中的冷却相变过程进行了三维数值模拟，讨论了熔渣颗粒直径和空气速度对冷却凝固过程演变的影响。结果表明：空冷方法能够实现熔渣颗粒表面的快速凝固成型，但同时也造成了颗粒内部的非均匀凝固。熔渣直径越小，完全凝固时间越短；空气流速越大时，其表面换热越强，完全冷却时间越短。颗粒初温为1673.15 K、直径为0.5~2 mm，风速为1~5 m·s^-1条件下熔渣颗粒在2 s内释放出全部凝固热，后续空气最高温度能达到900 K以上。

关键词: 高炉渣颗粒, 空气冷却, 温度场, 相界面, 数值模拟, 模型

Abstract: Solidification and heat transfer of an air-cooling molten blast furnace slag droplet is numerically simulated by the volume of fluid (VOF) method coupling with the solidification/melting model. The effects of droplet diameter and air velocity are investigated on the dynamic solidification evolution and heat transfer of the slag droplet, respectively. The results show that it is available for the air-cooling technique to realize fast solidification of the molten slag droplet surface, while non-uniform solidification evolution is found to occur inside the slag droplet. The solidification process of the molten slag droplet is expedited with decreasing droplet diameter and increasing air velocity due to the enhancement in the heat transfer. The optimum slag droplet diameter and air velocity should be comprehensively determined for a practical heat recovery system. As for a droplet with diameter of 0.5-2 mm at initial temperature of 1673.15 K, it releases the heat of solidification within 2 s under air velocity of 1-5 m·s^-1, and the highest air outflow temperature as a result can reach above 900 K.

Key words: blast furnace slag droplet, air-cooling, temperature field, phase interface, numerical simulation, model

中图分类号:

TQ021.3

邱勇军, 朱恂, 王宏, 廖强. 熔渣颗粒空冷相变换热的三维数值模拟[J]. 化工学报, 2014, 65(S1): 340-345.

QIU Yongjun, ZHU Xun, WANG Hong, LIAO Qiang. Three-dimensional simulation of solidification and heat transfer for air-cooling molten blast furnace slag droplet[J]. CIESC Journal, 2014, 65(S1): 340-345.

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熔渣颗粒空冷相变换热的三维数值模拟

Three-dimensional simulation of solidification and heat transfer for air-cooling molten blast furnace slag droplet

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