铁矿粉烧结液相流动性能的特征数方程的建立

为解决在研究铁矿粉烧结液相流动性能时通常只考虑面积增长率这一终点信息,而没有考虑过程信息的缺陷以及采用多个指标来表征流动性能在使用上的不便,对影响流动性的因素进行了分析,结合量纲分析和白金汉定理推导出了能定量表征流动性强弱的流动性特征数(LD),简化特征数方程后得到等效流动性特征数(LdΘ)。试验采用了可视卧式高温炉,记录了铁矿粉烧结液相流动的整个过程信息,通过基础实验和对照实验确定液相流动的起点和终点之后,可以得到每一种矿粉相应的等效流动性特征数数值。测量5种铁矿粉在两种方法下的流动性指标,当只考虑面积增长率时的流动性强弱顺序为AC≈DBE,新方法下为LdΘALdΘDLdΘC≈LdΘELdΘB,两种方法下的指标相近,但是综合了各种重要信息的新指标能进一步区分出各个因素对流动性能的影响程度。

Establishing the characteristic number equation about liquid phasefluidity of iron ore powder during sintering

The terminal point information of area growth rate is usually used to characterize liquid phase fluidity of iron ore powder during sintering.However, this characterization doesn ’t take process information into account.In order to avoid using several indexes to evaluate fluidity of iron ore powder,the factors that affect liquidity are analyzed,characteristic number (LD)which could quantitatively measure liquidity is deduced by dimensional analysis and Buckingham’s theorem.Equivalent characteristic number (LdΘ)is concluded by simplified the characteristic number equation.The high temperature furnace is used to record the whole process information in experiment.The value of each kind of ores’LdΘare calculated after starting point and ending point of liquid flowing are determined by basic experiment and control experiment.The data of liquidity of 5 kinds of mineral powder are measured under original standard and new standard,the result is respectively A>C≈D>B>E and LdΘA>LdΘD>LdΘC≈LdΘE>LdΘB .As a result, the two standards have identical results,but the new standard that combined important factors could distinguish the influence degree of each factors on fluidity.