闪速炉熔炼配风对反应过程的影响

Influences of reaction air parameters on smelting process in flash furnace

随着铜闪速炉熔炼强度的不断提高,熔炼生产及其反应配风之间的关系发生了明显变化,其相互影响关系需要重新确定,为此,建立闪速熔炼过程的数值模型,并采用CFD软件Fluent6.3就大投料量下闪速炉生产操作的2个主要参数(分散风与工艺风)对熔炼过程中气、粒两相运动与混合反应过程的影响进行仿真研究。研究结果表明:分散风工艺风的动量比对闪速炉内颗粒的分散效果影响显著;在适度分散精矿颗粒并有效控制其对反应塔壁造成冲刷蚀损的前提下,使用大分散风工艺风动量比更有利于炉内气、粒两相混合与反应过程的顺利进行;而在相同分散风工艺风动量比下,采用小工艺风风速的操作条件时炉内整体反应效果较佳。

With the increase of the throughput of flash furnaces,the relationship between the loading rate and the reaction air（especially the air speed） changes dramatically and needs to be re-determined,a systematic simulation study of two main parameters,i.e.,the distribution air and the process air,was carried out with the CFD software Fluent 6.3 to explore their effects on the mixing and reaction processes of the gaseous and particle phases in the reaction shaft.The results show that the momentum ratio of the distribution air to the process air has a great impact on the dispersion of particles inside the furnace.On the premise of proper dispersion of particles and good control of the erosion speed of the shaft refractory linings,the large momentum ratio of the distribution air to the process air is more helpful for good mixing and reaction processes between the particles and the gas.However,for cases with the same momentum ratio,the small process air velocity is recommended for the burner control to achieve comprehensively better smelting results.