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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。
A computational fluid dynamics (CFD) model of a commercial aluminum hydroxide crystallization stirred tank was established. The Euler-Euler flow model was used to simulate the particle suspension process. Aiming at the design of parking accident to be considered in actual production, the transient solver and the sliding mesh method are used. Based on the steady-state simulation results obtained, the development of the flow field during the 0.5 h stopping and restarting process are simulated and calculated Process, analyzed the fluid velocity distribution, particle phase distribution and stirring power change process. The results of calculation and analysis show that the fluid circulation in the tank will gradually dissipate after the accident and the particles will gradually deposit on the bottom. Stop after 0.5 h and then start for about 10 s Stirring power will reach much higher than the rated power of the stirring motor peak, if not designed auxiliary stirring device will cause the motor damage. The proposed model can be used as an effective simulation tool for the optimization of stirred tank design.