沥青颗粒旋风分离性能模型的建立与验证

Establishment and verification of cyclone separation performance model for asphalt particles

针对沥青颗粒因蓬松多孔、黏附性强、流动性差等造成旋风分离效率低,且目前商未有准确的分离效率计算模型等问题,以三区模型为基础,引入了新的特征尺寸、特征速度、颗粒球形度等因素,确定了更为准确的St数,最终建立了沥青颗粒分离性能的新模型。通过试验对比了新模型与原三区模型的差异性,结果表明,新模型可有效表征沥青的分离效率,误差不大于1.64%,表明该模型可准确表征颗粒密度、中位粒径、球形度在旋风分离过程中的影响;采用石油焦颗粒、煤粉颗粒、滑石粉颗粒等常规颗粒对该模型进行验证,新模型计算与试验结果吻合度高,其误差不大于1.03%,证明了新模型具有较高的普遍适用性。该模型的建立可为球形度小、流动性差、分离效率低的特殊颗粒旋风分离性能计算提供参考。

For the problems of low cyclone separation efficiency due to the characteristics of fluffy and porous asphalt particles with strong adhesion and poor fluidity,and no accurate separation efficiency calculation model currently,based on the three-zone model,new characteristic size,characteristic velocity,particle sphericity and other factors were introduced,the more accurate St number was determined,and finally a new model of asphalt particle separation performance was established.The differences between the new model and the original three-zone model were compared through experiments.The results show that the new model can effectively characterize the separation efficiency of asphalt,and the error is not greater than 1.64%,indicating that this model can accurately characterize the effects of particle density,average particle size and sphericity in the cyclone separation process.Finally,the model was verified by using conventional particles such as petroleum coke particles,coal powder particles,and talc particles.The results show that the calculation results of the new model are in good agreement with the experimental results,and the error is less than 1.03%,which proves that the new model has a high general applicability.The establishment of this model can provide a reference for calculation of the cyclone separation performance of special particles with small sphericity,poor fluidity and low separation efficiency.