高炉煤气平均停留时间的模拟及讨论

摘要

为了探究高炉煤气分布的规律,本研究在考虑料层分布的前提下使用三维高炉数学模型计算了煤气的平均停留时间.结果表明,料层分布对煤气流场影响明显,煤气平均停留时间和鼓风速度存在比较明显的线性关系.特别是对于1850m3的高炉在200m/s的鼓风速度下,模型求得煤气平均停留时间约为6s.此外,从几何相似的角度分析了几何模型的选择对模拟煤气平均停留时间的影响,得出了三维几何模型应为模拟煤气平均停留时间最优几何的结论.%In order to get a regularity of the gas distribution, the average gas residence time was calculated through a three-dimensional mathematical model of blast furnace (BF), taken into account of the previous calculation of the burden distribution.The results show that, the burden distribution pattern has an obvious impact on the gas flow field.There is an evident linear relationship between the average gas residence time and the blast velocity.Particularly, for the blast furnace of 1 850 m3, the average gas residence time is about 6 seconds at a blast velocity of 200 m/s.According to the similarity theory, effect of the model on the average gas residence time was analyzed.It was found that the three-dimensional model is an optimum one.