分离器入口处不同形状挡板对内部流场影响的比较分析  

Influence of Different Baffles on the Internal Flow Field at the Inlet of Separator

作　　者：王学平 文学 龚斌 吴剑华 WANG Xue-ping, WEN Xue, GONG Bin, WU Jian-hua(Shenyang University of Chemical Technology, Shenyang 110142, China)

机构地区：[1]沈阳化工大学机械工程学院,辽宁沈阳110142

出　　处：《沈阳化工大学学报》2018年第3期250-258,共9页Journal of Shenyang University of Chemical Technology

基　　金：辽宁省博士科研启动基金(20131090);辽宁省教育厅科研项目计划(L2013164)

摘　　要：液液分离器的分离需要稳定的流场环境,而分离器入口处的防冲挡板对分离区的流体稳定性起着决定性作用,因此针对液液分离器入口处常用的方形平板和球壳形防冲挡板,应用Fluent软件对分离器内部流场进行数值研究,全面地比较两种不同形状防冲挡板在各种相同状态下对分离器内流体流动状态的影响.结果表明:在大冲击间距和大挡板尺寸的情况下,方形挡板的稳流效果比球壳形挡板好;大冲击间距和大挡板尺寸的情况下,球壳形挡板后的涡较小,稳流效果比方形平板好些;大冲击间距和小挡板尺寸下,两种挡板后的分离器内部流场较紊乱;在大间距情况下,分离区的流速在球壳形挡板后比方形板后大很多;小冲击间距和小挡板尺寸情况下,分离器内部流体流动的状态较平稳;两种挡板对流场的稳定效果较相似,但球壳形挡板的流场分布较方形板的均匀.在以上所有相同状态下,采用球壳形挡板的模型都要比采用方形平板的模型拥有更小的平均速度和平均湍流强度,说明采用球壳形挡板分离区的流速分布较均匀而且平稳,应当尽量选用球壳形挡板进行工业生产.在绝大多数情况下,球壳形挡板对液液分离器内部流场的稳定作用要比方形平板强.The separation of liquid-liquid separator requires stable flow field environment, and the impingement baffle of the separator at the entrance in the separated region fluid stability plays a decisive role. So for liquid-liquid separator at the entrance to the commonly used square plate and spherical shell shaped anti impingement baffle. The internal flow field of cyclone separator was simulated by FLUENT, a compre- hensive comparison of the two different shapes anti impingement baffle in all the same state of separator the flowing state of the fluid in the impact was carried out. The results show that, in the case of large impact distance and large baffle size, the flow stabilization effect of the square baffle is better than that of the spherical shell baffle. In the case of large impact distance and large baffle size, the vortex behind the spherical shell baffle is smaller, and the steady flow effect is better than that of the square plate. The internal flow field of the separator with large impact distance and small baffle size is disordered. In the case of large distance, the velocity of flow behind the spherical shell baffle is much larger than that behind the square plate. In the case of small impact distance and small baffle size, the flow state in the separator will be more stable, and the flow field distribution of the spherical shell baffle is more uniform than that of the square plate, while the stability effect of the two baffles is similar. In all the same states above, the model with spherical shell baffle has smaller average velocity and average turbulent intensity than the model with square plate, which indicates that the velocity distribution in the separation zone is more uniform and stable. The spherical shell baffle should be used as far as possible for industrial production. In most cases, the spherical baffle is more effective than the square plate in stabilizing the flow field in the liquid-liquid separator.

关 键 词：液液分离器 入口 防冲挡板 流体流动状态 冲击射流 比较 

分 类 号：TQ028.4[化学工程]