回转窑内气体和物料温度分布的研究

Study on Temperature Distribution of Gas and Material in Rotary Kiln

为进一步探索回转窑的优化设计及经济运行情况,在已有的回转窑传热研究的基础上,将其内部的传质过程与对流、辐射、传导3种热交换方式相结合,建立了计算回转窑温度分布的综合数学模型,预测了窑内烟气、物料及窑内壁的温度分布,并对某厂回转窑进行数值计算。结果表明:在距窑头约14m处,气体温度达到最高值,约为1760℃,物料温度约为1465℃,随后气体和物料温度沿窑长逐渐下降,到达窑尾处时分别降至约1028℃和856℃。计算结果与实际运行结果吻合较好,说明该模拟方法具有一定适用性。

Based on the previous study on heat transfer in rotary kiln, a comprehensive mathematical model for temperature distribution in rotary kiln was established combining mass transfer with three kinds of heat transfer process--radiation, convection and conduction, with the aim of further exploration on the optimum design and economic operation. The temperature distributions of gas, solid and inner wall in the kiln were predicted, and the numerical calculation for a rotary kiln was carried out. The results show that the gas temperature reaches maximum value of about 1760℃ and solid temperature is 1450℃ at 14m rotary kiln, and then they drop along the length of kiln. The gas and solid temperature fall to 1028~C and 856~C, respectively, at the kiln end. The calculated temperature distribution data exhibit a close agreement to the measured ones, which proves the effectiveness of the established model.