低填充比下混合滚筒粉体混合特性数值模拟

发布时间：2018-03-25 05:34

本文选题：滚筒　切入点：低填充比　出处：《化工进展》2017年01期

【摘要】：对于易燃易爆粉体的混合安全性,低填充比具有重要意义,目前尚未见混合滚筒在低填充比条件下混合特性的研究报道。本文采用气固三相流模型对两种粉体在混合滚筒中的混合过程进行建模。粉体与空气间相互作用系数采用Syamlal-O’Brien公式,粉体与粉体之间相互作用系数采用Syamlal-O’Brien-Symmetric公式。采用加权的组分配比分布方差对混合均匀性进行判断。计算结果表明混合滚筒在低填充比下具有较高的混合效率以及混合质量,并初步计算了不同填充比、转速、滚筒结构参数条件下的混合特性,对计算结果进行了分析。最后利用一个直径1000mm的混合滚筒,在低填充比条件下进行了实验,记录了混合过程中物料流过抄板的流态,对样品均匀性进行了化学分析。实验结果证明了仿真计算结果的准确性。低填充比下使用滚筒,有利于保证易燃易爆粉体混合工艺安全性,具有较好的应用前景。
[Abstract]:For the safety of combustible and explosive powder mixing, low filling ratio is of great significance. At present, there is no report on mixing characteristics of mixing drum under low filling ratio. In this paper, the mixing process of two kinds of powders in mixing drum is modeled by gas-solid three-phase flow model. The interaction coefficient between powder and air is modeled by Syamlal-O'Brien formula. The interaction coefficient between powder and powder is determined by Syamlal-O'Brien-Symmetric formula, and the mixing uniformity is judged by the variance of weighted distribution ratio. The results show that the mixing drum has high mixing efficiency and mixing quality at low filling ratio. The mixing characteristics of different filling ratio, rotational speed and drum structure parameters are calculated and the results are analyzed. Finally, an experiment is carried out under the condition of low filling ratio using a mixing cylinder with diameter 1000mm. The flow state of the material passing through the plate during mixing was recorded, and the uniformity of the sample was analyzed chemically. The experimental results proved the accuracy of the simulation results. It is beneficial to ensure the safety of combustible and explosive powder mixing process and has a good application prospect.
【作者单位】：西安近代化学研究所氟氮化工资源高效开发与利用国家重点实验室;
【基金】：国防科技工业基础产品创新计划火炸药科研重大专项
【分类号】：TB383.3;TQ027.1

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