Numerical simulation on phase transformation characteristics during water quenching process of single slag particle
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摘要: 为明确水淬过程中熔渣的相变机理，优化工艺参数，研究了熔渣水淬中的相变过程。首先，根据熔渣触水瞬间形成的蒸汽薄膜结合流场特性，构建了含蒸汽薄膜的熔渣模型；随后，以粒径3 mm、水速5 m/s、温度
1300 ℃为基础工况，分析了熔渣的温度场变化、相变进程，以及不同位置的温度差异；在此基础上，分别探究了流速对熔渣换热过程的影响，以及相同水流速度下不同粒径熔渣的传热特性，并对4、5 mm熔渣冷却下的最佳流速进行了补充验证。结果表明：流速对熔渣换热存在阈值效应，超过5 m/s后影响趋于平缓；4、5 mm熔渣在5 m/s水流速度下无法满足冷却要求，而10 m/s水流速度可实现冷却。最终确定最优方案，研究为水淬熔渣工艺的参数优化提供了理论依据与数据支撑。Abstract: To clarify the phase transformation mechanism of molten slag during water quenching and optimize the process parameters, this paper investigates the phase transformation process of molten slag after contact with water. First, combining the characteristics of the vapor film formed at the moment when molten slag contacts water with the flow field properties, a molten slag model containing a vapor film was established. Then, taking a particle size of 3 mm, a water velocity of 5 m/s, and an initial temperature of1300 ℃ as the basic working conditions, the changes in the temperature field, phase transformation process, and temperature differences at different positions of the molten slag were analyzed. On this basis, the effect of water velocity on the heat exchange process of molten slag was explored, as well as the heat transfer characteristics of molten slag with different particle sizes under the same water velocity. In addition, supplementary verification was conducted on the optimal water velocity for cooling molten slag with particle sizes of 4 mm and 5 mm. The results show that water velocity has a threshold effect on the heat exchange of molten slag; its influence tends to flatten out when the velocity exceeds 5 m/s. Molten slag with particle sizes of 4 mm and 5 mm cannot meet the cooling requirements at a water velocity of 5 m/s, while a water velocity of 10 m/s can achieve effective cooling. Finally, the optimal process scheme was determined. This study provides theoretical basis and data support for the parameter optimization of the molten slag water quenching process. -
图 1
1300 ℃熔渣触水瞬间蒸汽薄膜厚度Figure 1. Steam film thickness of
1300 ℃ molten slag at the moment of water contact
图 2 水流冲击熔渣时局部流态特征
Figure 2. Local flow pattern characteristics of water impingement on molten slag
图 3 含汽化层的熔渣颗粒几何模型
Figure 3. Geometric model of molten slag particles with vaporization layer
图 6 模型与文献仿真结果的对比验证
Figure 6. Comparison and validation of the model with literature simulation results
图 7 基础工况下熔渣水淬温度场演变过程云图
Figure 7. Evolution process of temperature field of molten slag during water quenching under basic working conditions
图 8 基础工况下熔渣水淬相变过程云图
Figure 8. Phase transition process of molten slag during water quenching under basic working conditions
图 9 基础工况下熔渣不同位置温度变化曲线
Figure 9. Temperature variation curves of molten slag at different positions under basic working conditions
图 10 不同水流速度下熔渣温度变化曲线对比
Figure 10. Comparison of temperature variation curves of molten slag under different water flow velocities
图 11 不同水流速度下熔渣水淬温度场对比云图
Figure 11. Comparison cloud map of temperature field of molten slag during water quenching under different water flow velocities
图 12 不同粒径熔渣温度变化曲线对比
Figure 12. Comparison of temperature variation curves of molten slag with different particle sizes
图 13 不同粒径熔渣水淬温度场对比云图
Figure 13. Comparison cloud map of temperature field of molten slag during water quenching with different particle sizes
图 14 4~5 mm熔渣在不同水流速度下的温度变化曲线对比
Figure 14. Comparison of temperature variation curves of 4~5 mm molten slag under different water flow velocities
图 15 粒径-水速匹配关系及冷却效果验证曲线
Figure 15. Comparison curve of particle size-water velocity matching relationship and cooling effect verification
表 1 模拟计算中物性参数
Table 1. Physical property parameters in simulation calculation
Species Temperature/℃ Velocity/(m·s−1) Density/(kg·m−3) Molten slag
particles1300 0 2840 Water 25 1/3/5/7/10 1000 Air 25 0 1.2 Water vapor 1300 0 0.6 
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