Simulation study on granulation characteristics of blast furnace slag water jet
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摘要: 鉴于常规的气淬粒化工艺可能存在的问题（如耗气量大等），拟采用水流作为粒化介质，开展高速水射流作用下熔渣粒化过程的数值模拟研究。研究利用VOF-to-DPM模型计算水射流熔渣粒化过程和熔渣粒径分布，并探究水流速度、熔渣速度、黏度等粒化条件对平均粒径等粒化结果的影响。结果表明：随着水流速度的增大，粒化后熔渣平均粒径减小，当水流速度达到30 m/s时，在所研究的参数条件下，基本不存在4 mm以上的大颗粒；当熔渣速度增加时，若水流厚度充足，对粒化效果和粒径分布影响很小；若水流厚度不足，则会出现未破碎熔渣直接下落的现象。为保证水流量充足，水渣比应达到2.2∶1；当熔渣黏度增加时，熔渣破碎效果变差，粒径分布和平均粒径明显增加。Abstract: Given the potential problems of the conventional gas quenching granulation process, such as the high gas consumption, this study intends to carry out a numerical simulation study of the slag granulation process under the action of high-speed water jet, using water flow as the granulation medium. The VOF-to-DPM model was used to calculate the granulation process and slag size distribution of water jet slag, and to explore the effects of water flow velocity, slag velocity, viscosity and other granulation process conditions on the average particle size and other granulation results. The results show that with the increase of water velocity, the average particle size of the slag after granulation decreases, and when the water velocity reaches 30 m/s, there are basically no large particles above 4 mm under the parameters studied. When the slag velocity increases, and the water flow thickness is sufficient, it has little influence on the granulation effect and particle size distribution. When the water flow thickness is insufficient, there will be a phenomenon of unbroken slag falling directly. In order to ensure that the water flow is sufficient, the water slag ratio should reach 2.2:1; when the slag viscosity increases, the slag crushing effect is getting worse, and the particle size distribution and average particle size increase significantly.
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Key words:
- water jets /
- granulation /
- numerical simulation /
- slag /
- average particle size
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图 3 熔渣粒化破碎过程
Figure 3. Slag granulation and crushing process
(a) t=12 ms；(b) t=15 ms；(c) t=18 ms；(d) t=21 ms
图 4 熔渣速度分布和液膜破碎过程
Figure 4. Slag velocity distribution and liquid film crushing process
图 6 不同水流速度粒化效果对比
（a）15 m/s；（b）20 m/s；（c）25 m/s；（d）30 m/s
Figure 6. Comparison of granulation effects at different water flow rates
图 9 不同熔渣速度粒化效果对比
（a）3 m/s；（b）4 m/s；（c）5 m/s；（d）6 m/s
Figure 9. Comparison of granulation effects of different slag flow rates
图 10 粒径分布随熔渣速度的变化情况
Figure 10. Particle size distribution as a function of slag flow velocity
图 11 平均粒径随熔渣速度的变化情况
Figure 11. The change in average particle size with the flow rate of slag
图 12 粒径分布随熔渣黏度的变化情况
Figure 12. Particle size distribution as a function of slag viscosity
图 13 平均粒径随熔渣黏度的变化情况
Figure 13. The change in average particle size with the viscosity of the slag
表 1 模拟计算中气水渣物性参数
Table 1. Physical parameters of water slag in the simulation calculation
种类 密度/（kg·m−3） 黏度/（kg·m−1·s−1） 表面张力/(N·m−1) 高炉渣 2800 0.45 0.5 水 998.2 1.004×10−3 0.072 空气 1.225 1.7894 ×10−5
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