【作者】 赵小楠；

【导师】 韦鲁滨；

【作者基本信息】 中国矿业大学（北京） ， 矿物加工工程， 2014， 博士

【摘要】 本文依据两相流体动力学理论，提出了变径脉冲气流分选技术，分析了变径脉冲气流场内颗粒按密度分选机理，设计了变径脉冲气流分选机，构建了变径脉冲气流分选系统。在恒定流场内，研究了气速对重产物分配、分选密度、分选效率等的影响规律；讨论了入料性质和分选机结构对分选的影响。在脉冲气流场内，分析了脉动开闭比值、脉动周期、脉动气流和脉冲气流对5-3.2mm粉煤重产物分配和分选效率的影响；利用正交试验得到了分选效率与恒定流、脉动流和脉动开闭比值之间关系的数学模型。在此基础上，研究了不同粒度和可选性入料的脉动开闭设定规律，考察了5-2.5mm粉煤脉冲气流分选效果。借助数值模拟分析了变径结构和气流速度分布对按密度分选的影响规律。更多还原

【Abstract】 On the basis of gas-solid two-phase hydromechanics theory, variable-diameter pulsed airseparation technology was promoted, mechanism of separating particles in variable diameterspulsed airflow field based on density was researched in this paper, variable diameters pulsed airseparator was designed, variable diameters pulsed air separation system was established. Inconstant airflow field, the effect of velocity on heavy product distribution, separation density andseparation efficiency were researched, and the effect of feed characteristics and separator structureon separation efficiency was discussed. In pulsed airflow field, the effects of pulsation on-off ratio,pulsation period, pulsation airflow, and pulsed airflow on heavy product distribution andseparation efficiency for5-3.2mm fine coal were researched. With orthogonal experiment,mathematical model between separation efficiency and constant airflow, pulsation airflow, pulseon-off ratio was gained. On this basis, the rule of setting pulsation on-off with different granularityand washable feed was studied，and separation efficiency in pulsed airflow of5-2.5mm fine coalwas researched. The influence of variable-diameter structure and airflow velocity distribution onseparating by density was analysed by means of numerical simulating更多还原