闪速炉反应塔炉膛内形的数值模拟与在线显示

Numerical simulation and on-line display of freeze profile of reaction shaft in flash smelting furnace

采用传热数值计算的方法对闪速炉反应塔塔壁进行了模拟 ,获得了反应塔壁面温度分布及其内壁挂渣层厚度的仿真计算结果 ,首次实现了反应塔炉膛内形的在线显示。用于工业生产后 ,经现场检验 ,软件仿真计算结果与实际数值接近 ,其中炉膛温度相差不足 4 0℃ ,挂渣层厚度平均误差 <3 % ,可完全满足生产要求。该软件的研制为实践中实现反应塔炉膛内形实时监控创造了条件 ,并成为闪速炉生产操作优化的理论依据。同时通过仿真研究发现 ,冷却水套对反应塔炉膛内形影响显著 ,加强冷却系统的强度将有利于保护炉衬 。

Based on the principal of heat transfer, a mathematical model of the wall of reaction shaft in a flash smelting furnace was developed, and the simulation results of the distribution of temperature field and the slag thickness of the wall in the shaft were obtained. It is the first time to realize the on line display of the freeze profile of reaction shaft. Compared with the practical data, the computational results are satisfactory. The error of the hearth temperature is less than 40?℃, and the average error of the slag thickness is less than 3%. The software provides not only a way to monitor the reaction shaft in practice, but also a theoretical base for optimization of flash smelting furnace. At the same time, great influences of the cooling jackets on the temperature of the hearth are also found. It is concluded that a strengthened cooling system will effectively prolong the life of the refractory.