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建立含钒页岩焙烧用回转窑的稳态传热数学模型,运用Fluent软件模拟计算等径回转窑内流场和温度分布。在合适位置扩大等径回转窑尾内径,对其窑内流场和温度分布进行模拟计算。在此基础上,分析变径大小和变径位置对窑内温度的影响,得到最优的变径回转窑;然后分析比较等径型与变径型回转窑温度分布特征。结果表明:在相同的工艺条件下,在合适位置变径的变径回转窑焙烧段长度比等径型回转窑的长,有利于提高含钒页岩中各低价态钒的氧化率。
The steady-state heat transfer mathematical model of rotary kiln used in roasting of vanadium-bearing shale was established. The flow field and temperature distribution in the kiln were measured by Fluent software. In the suitable position, the inner diameter of the kiln tail of equal-diameter rotary kiln is enlarged and the flow field and temperature distribution in the kiln are simulated. On this basis, the influence of the diameter reduction and the diameter reduction on the temperature in the kiln is analyzed, and the optimal variable-diameter rotary kiln is obtained. Then, the temperature distribution characteristics of the equal-diameter and variable-diameter rotary kilns are analyzed and compared. The results show that under the same process conditions, the length of roasting section of variable diameter rotary kiln reduced in the proper position is longer than that of the same diameter rotary kiln, which is beneficial to increase the oxidation rate of each vanadium in shale containing vanadium.