气浮除油过程中流场特性仿真模拟研究  

Simulation study on flow field characteristics of air flotation deoiling process

作　　者：陈爱良 毛迦勒 曹疆 刘瑶 卢苏君 HWANG Jiann-yang 孙丰龙 CHEN Ailiang;MAO Jiale;CAO Jiang;LIU Yao;LU Sujun;HWANG Jiann-yang;SUN Fenglong(School of Metallurgy and Environment,Central South University,Changsha 410083,China;National Key Laboratory of Nickel-Cobalt Co-associated Resources Development and Comprehensive Utilization,Jinchang 737100,China;Michigan Technological University,MI 49931,USA)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]镍钴资源综合利用国家重点实验室,甘肃金昌737100 [3]Michigan Technological University,MI 49931,USA

出　　处：《中南大学学报（自然科学版）》2023年第5期1680-1691,共12页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2022YFC3902001);国家自然科学基金资助项目(52004340);广西科技重大专项(桂科AA22067077,2021AB26024)。

摘　　要：针对萃取冶金溶气气浮除油过程中澄清效率低、后续处理工序长的问题,利用雷诺平均NavierStokes湍流数值模拟方法及κ-ω湍流模型,并结合国内某大型企业气浮除油生产设备的具体工艺参数,分析溶气气浮槽内的流场特性。研究结果表明:1)当鼓气量不变,进液量为45~55 m^(3)/h时,流体呈较理想流动状态,有利于气浮除油;而当进液量为较低值(40 m^(3)/h)或较高值(60 m^(3)/h)时,气相则会集中在壁面,不利于气浮除油;2)当进液量不变,鼓气量增加时,壁面液相速度和气相体积分数增加,气相分布集中在壁面,不利于气浮除油;3)较低位置的液/气相入口和较低的隔板不利于气浮除油。In order to solve the problems of low clarification efficiency and long subsequent processing steps in the extraction metallurgically dissolved air flotation(DAF) process,supported by the actual process with a domestic oil removal equipment,the Reynolds Average Navier-Stokes(RANS) turbulence transient numerical simulation method and the κ-ω turbulence model were used to analyze the flow characteristics of internal flow.The results are shown as follows.1) With a constant air blowing volume,it is favorable for oil removal with the range of the liquid inlet volume from 45 m^(3)/h to 55 m^(3)/h because of the good flow properties;while the liquid inlet is lower than 40 m^(3)/h or higher than 60 m^(3)/h,the gas bubbles are concentrated in the surface of the reactor,which leads to the low efficiency of the oil separation.2) With a constant liquid inlet volume,the wall velocity and gas volume fraction increase while the gas inlet increases,which shows unfavorable effects for the oil removal because of the gas distribution on the wall.3) The lower position of the liquid inlet or the gas phase inlet and the lower height of the partition have obvious adverse effects on the separation of oil from liquid phases.

关 键 词：计算流体力学 溶气气浮 两相流 流场特性 水力背景设计 

分 类 号：TF355.4[冶金工程—冶金机械及自动化]