CAJ | 학술논문

建立了一个工业氢氧化铝结晶搅拌槽的计算流体力学 CFD 模型,应用欧拉-欧拉多相流模型模拟了槽内颗粒的悬浮过程.针对实际生产中需考虑的停车事故设计,应用瞬态解算器和滑移网格法,在得到的稳态模拟结果基础上,模拟计算了停车0.5 h 以及再启动过程中流场的发展变化过程,分析了流体速度分布、颗粒相分布以及搅拌功率变化过程.计算分析结果表明,事故停车之后槽内流体循环会逐渐消散,颗粒会逐渐在底部沉积.停车0.5 h 后再启动约10 s搅拌功率会达到远高于搅拌电机额定功率的峰值,如不设计辅助搅拌装置则会导致电机损坏.文中提出的模型可以作为搅拌槽优化设计的有效仿真工具.
건립료일개공업경양화려결정교반조적계산류체역학 CFD 모형,응용구랍-구랍다상류모형모의료조내과립적현부과정.침대실제생산중수고필적정차사고설계,응용순태해산기화활이망격법,재득도적은태모의결과기출상,모의계산료정차0.5 h 이급재계동과정중류장적발전변화과정,분석료류체속도분포、과립상분포이급교반공솔변화과정.계산분석결과표명,사고정차지후조내류체순배회축점소산,과립회축점재저부침적.정차0.5 h 후재계동약10 s교반공솔회체도원고우교반전궤액정공솔적봉치,여불설계보조교반장치칙회도치전궤손배.문중제출적모형가이작위교반조우화설계적유효방진공구.
A CFD(Computation Fluid Dynamics) model of commercial aluminum hydroxide stirred tank was established, and the Euler-Euler multi-phase model was used to simulate the mixing and suspension of the aluminum hydroxide particles in the stirred tank. In order to study the potential accidental power off scenario which is ought to be considered in the commercial design, the simulation technologies including moving mesh and transient solver were adopted, and on the base of steady simulation results, the flow field developments in the processes of stirring abnormal stop and restarting were simulated separately. The calculation results of both the fluid velocity and the particle phase distributions and the stir power variation were analyzed, the results show that the solid particles will sink down and pile up on the bottom of the stirred tank, which makes that, after the accident power cut down more than 0.5 hour, the start up stir power of the restarting process becomes much higher than the rated stir power, and if without the help of the assisting equipment, the electrical appliance of the stirrer will break down when restarting. Finally, the model presented in this paper is an available tool for the optimal design of the large-scale stirred tanks.