摘要
基于Fluent软件,采用标准的kε湍流模型、欧拉欧拉多相流模型、多重参考系稳态流动方法,对浸出槽内固液两相流动过程进行数值模拟研究,且采用示踪剂法研究流体在槽内停留时间的分布。将临界离底悬浮转速的数值模拟结果与Zwietering临界转速进行比较,两者吻合较好,验证模型的有效性。应用数值模拟方法研究桨叶离底高度、桨叶间距和阻尼板高度对槽内固相浓度分布和浸出液平均停留时间的影响规律。结果表明:在一定范围内,增大桨叶间距有利于固相分布均匀,延长浸出液的平均停留时间,从而促进固液相之间的传质扩散,当桨叶间距为2D(D为浸出槽直径)时,效果较优;在一定范围内,增大阻尼板高度有利于槽内固相的上浮;在允许范围内,降低桨叶离底高度有利于改善槽底沉积现象,增大浸出液的平均停留时间,当桨叶离底高度为0.3D时,效果较好。
Based on Fluent software, the solid-liquid two-phase flow field of mechanical stirred zinc leach tank was simulated with standard k-ε turbulenee model, Eulerian-Eulerian multiphase model and multi-reference flame method of steady-state flow. The residence time distribution of fluid in the tank was calculated mainly by tracer method. The result of critical suspended impeller speed was compared with the Zwietering correlation and the feasibility of the model and method was verified. The influences of some parameters, such as the distances between two impellers, the height of baffle and the distance of impeller from bottom, on solid concentration distribution and the residence time distribution of fluid in the tank were studied. The following conclusions are obtained. The increase of the distances between two impellers within a certain range is helpful for the uniform distribution of solid phase and increases the mean residence time of fluid, which promotes the mass transfer and diffusion between solid and liquid. The optimal distance is 2D （D is the diameter of leaktank）. Increasing the height of baffle is advantageous to the raise of solid phase. Lowering the distance of impeller from bottom can decrease the solid deposition at the bottom and increase the mean residence time of fluid. The appropriate distance is 0.3D.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第6期1835-1841,共7页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2010AA065201)
关键词
浸出槽
欧拉欧拉多相流模型
多重参考系
固液两相流
停留时间
leach tank
Eulerian-Eulerian multiphase model
multi-reference flame method
solid-liquid two-phase flow
residence time
