高纯氢氧化镁大型反应结晶器CFD模拟  

CFD Simulation of Large Scale Reaction Crystallizer for High Purity Magnesium Hydroxide

作　　者：马小龙 陈杭[2] 赵盼盼[2] 宋兴福[2] MA Xiaolong;CHEN Hang;ZHAO Panpan;SONG Xingfu(Qinghai Salt Lake Haina Chemical Co.Ltd,Xining 811600,China;Engineering Research Center of Resource Process Engineering,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]青海盐湖海纳化工有限公司,西宁811600 [2]华东理工大学资源过程工程教育部工程研究中心,上海200237

出　　处：《华东理工大学学报（自然科学版）》2022年第4期443-448,共6页Journal of East China University of Science and Technology

摘　　要：应用Fluent多重参考系坐标法及标准k-ε模型,考察搅拌桨安装高度、搅拌桨转速对大型氢氧化镁反应结晶器内流场分布及氢氧化镁颗粒悬浮状态的影响。计算结果表明,适当增加搅拌桨安装高度,有利于降低反应结晶器底部区域流体速度,从而有利于大颗粒沉降并进入排出设备;但搅拌桨安装高度过高,会导致折流筒内的流体速度增加,速度均匀性变差,搅拌桨安装高度为3.3 m为宜。低搅拌速度不利于氢氧化镁颗粒悬浮,随着搅拌桨转速提升,沉降区的流动均匀性显著改善,结晶器内晶体颗粒的悬浮状态更加均匀,最优转速为70 r/min。The effects of impeller installation height and stirring speed on the hydrodynamics and the suspension state of the Mg(OH)particles in large scale reaction crystallizer were studied by multiple reference frame(MRF)and the standard k-εmodel in Fluent software.The simulated results showed that the appropriate increase of impeller installation height was benefit for the settling and discharging of the coarse particles,which mainly attributed to the decrease of flow velocity in the bottom zone of the crystallizer.When the installation height was too high,the flow velocity in the baffle cylinder was increased,which caused the nonuniformity of the flow velocity.The low stirring speed was disadvantageous for the suspension of Mg(OH)particles.With the increasing stirring speed,the nonuniformity of the flow velocity in the settling zone was significantly improved and the particles in the crystallizer were more uniform in suspension state.The optimal installation height of impeller and stirring speed were determined to be 3.3 m and 70 r/min,respectively.

关 键 词：数值模拟 反应结晶器 氢氧化镁 

分 类 号：TQ115[化学工程—无机化工]