影响回转式干馏炉颗粒混合效果的因素分析

Analysis of Factors Affecting Pellet Mixing in Rotary Dry Furnaces

摘要: 回转式干馏炉是小颗粒油页岩干馏时的重要设备，内部油页岩与页岩灰颗粒的混合效果极大程度的影响了干馏效果，因此，本文采用离散元法对影响油页岩与页岩灰颗粒混合特性和运动特性的四种因素进行了系统的数值研究。包括：轴向抄板间距、干馏炉转速、油页岩粒径、炉内填充度。通过混合指数、速度分布云图等指标来评价油页岩与页岩灰的混合特性与运动特性。结果表明：随着轴向抄板间距的减小，油页岩与页岩灰颗粒混合效果呈现增高趋势，但是在完全接触时(间距为0)混合效果下降。这是因为闭合减少了油页岩与页岩灰之间的相对位移，不利于混合。转速和粒径的增加的确会使混合效果与混合速率提高，但增加的趋势越来越小；低填充度也会使混合效果提高。

Abstract: The rotary dry distillation furnace is an important equipment in the dry distillation of small-grained oil shale. The mixing of internal oil shale and shale ash greatly affects the dry distillation effect. Therefore, this study adopts the discrete element method to carry out a systematic numerical study on the four factors affecting the mixing characteristics and kinematic properties of oil shale and shale ash, including axial response spacing, rotational speed of dry distillation furnace, oil shale particle size, and furnace filling degree. The mixing and kinematic properties of oil shale and shale ash were evaluated by mixing index and velocity distribution cloud diagram. The results showed that the mixing effect of oil shale and shale ash showed an increasing trend as the axial plate spacing decreased, but the mixing effect decreased at full contact (spacing of 0). This is because the closure reduces the relative displacement between oil shale and shale ash, which is not conducive to mixing. An increase in rotational speed and particle size does lead to an increase in mixing efficiency and mixing rate, but the trend of increase is getting smaller; low filling degree also leads to an increase in mixing efficiency.