Theoretic analysis on transient solidification behaviors of a molten blast furnace slag particle

LIU Xiaoying; ZHU Xun; LIAO Qiang; WANG Hong

doi:10.3969/j.issn.0438-1157.2014.z1.046

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Theoretic analysis on transient solidification behaviors of a molten blast furnace slag particle

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- Theoretic analysis on transient solidification behaviors of a molten blast furnace slag particle
- CIESC Journal Issue S1, Pages: 285-291(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.z1.046
  CLC： K01
- Online First：30 May 2014，
  
  Published：30 May 2014
- 稿件说明：
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LIU Xiaoying, ZHU Xun, LIAO Qiang, et al. Theoretic analysis on transient solidification behaviors of a molten blast furnace slag particle[J]. CIESC Journal, 2014, (S1): 285-291.
DOI：

LIU Xiaoying, ZHU Xun, LIAO Qiang, et al. Theoretic analysis on transient solidification behaviors of a molten blast furnace slag particle[J]. CIESC Journal, 2014, (S1): 285-291. DOI： 10.3969/j.issn.0438-1157.2014.z1.046.

摘要

采用温度法模型对高温熔融高炉渣颗粒的相变冷却特性进行了分析，考虑颗粒固液相热导率随温度的变化及颗粒与环境的辐射换热，获得了高温熔渣颗粒内的温度分布以及相界面位置随时间的推移过程。讨论了变热导率、换热条件、颗粒尺寸，冷却流体速度和温度对相变冷却过程的影响，结果表明：热导率的变化使得颗粒冷却凝固时间延长，高温辐射换热极大加快了冷却速率；颗粒直径增加，相界面移动速度降低，凝固时间增加；冷却流体速度增加，温度降低，相界面移动速度增加，凝固时间缩短。

Abstract

A theoretic analysis is performed with temperature model on transient air cooling and solidification behaviors of a spherical molten slag particle. With considering the variation of thermal conductivity with temperature and the radiation between slag and environment

the temperature distribution and the transient moving of phase-change interface inside the particle are obtained by applying the finite difference method. The effects of variable thermal conductivity

heat transfer boundary condition

slag particle size

air flow rate and initial temperature of the slag particle are discussed. The simulation results indicate that the variable thermal conductivity of the slag extends the solidification process

while the radiation significantly improves the cooling speed. Meanwhile

the solidification process is speeded up with increasing air flow rate and decreasing particle size. The cooling and solidification process is prolonged for the slag particle with higher initial temperature.

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