School of Mechanical and Electronic Engineering, Shandong University of Science and Technology
Shaoxing Yuecheng Casting Co. , Ltd.
School of Resources, Shandong University of Science and Technology

针对连采连充矸石胶结充填系统在长城六矿的工程应用中,二级搅拌机的出浆口时常堵塞的问题,采用Fluent欧拉多相流模型和可实现性k-ε湍流模型,运用滑移网格法对搅拌机中的固液两相流进行了瞬态模拟,并根据输出结果分析了堵塞原因,确定了优化指标。在此基础上,分别研究了转速、叶片倾角、叶轮直径和叶轮数对搅拌效果的影响,发现:提高转速、在45°以内增大叶片倾角、适当增加叶轮直径和叶轮数有助于改善搅拌效果,缓解堵塞现象,最终将二级搅拌机的优化方案确定为转速75r/min、叶片倾角34°、叶轮直径1.3m和5层叶轮,有效降低了罐底固液两相流的密度,提高了出浆口处灰浆的流动性。

In view of the problem that the slurry outlet of the secondary mixer is often blocked in the engineering application of continuous mining and continuous gangue cemented filling system in Changcheng No. 6 Mine, the Fluent Euler multiphase flow model and Realizable k-ε turbulent model was used to simulate the transient flow of solid-liquid two-phase flow in the mixer using sliding grid method. The reasons for the blockage were analyzed, and optimization indicators were determined. On this basis, the effects of rotational speed, blade inclination angle, impeller diameter, and impeller number on the stirring effect were studied separately. It was found that increasing rotational speed, increasing blade inclination angle within 45°, and appropriately increasing impeller diameter and number of impellers can help improve the mixing effect and alleviate the blockage. Finally, the optimization plan for the secondary mixer was determined as a rotational speed of r/ min, blade inclination angle of 34°, impeller diameter of 1. 3 m, and a 5-layer impeller, which effectively reduced the two-phase flow density at the bottom of the tank and improved the fluidity of the slurry at the outlet.

王壮,尉炳夫,刘锋珍.矸石胶结充填二级搅拌机优化设计及仿真分析[J].煤炭工程,2024,56(4):91-97.