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

QIU Yongjun; ZHU Xun; WANG Hong; LIAO Qiang

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

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

更新时间：2025-12-10

- Three-dimensional simulation of solidification and heat transfer for air-cooling molten blast furnace slag droplet
- CIESC Journal Issue S1, Pages: 340-345(2014)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.z1.055
  CLC： Q021.3
- Online First：30 May 2014，
  
  Published：30 May 2014
- 稿件说明：
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QIU Yongjun, ZHU Xun, WANG Hong, et al. Three-dimensional simulation of solidification and heat transfer for air-cooling molten blast furnace slag droplet[J]. CIESC Journal, 2014, (S1): 340-345.
DOI：

QIU Yongjun, ZHU Xun, WANG Hong, et al. Three-dimensional simulation of solidification and heat transfer for air-cooling molten blast furnace slag droplet[J]. CIESC Journal, 2014, (S1): 340-345. DOI： 10.3969/j.issn.0438-1157.2014.z1.055.

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。

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.

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