小型高效气动立式预混装置异形桨叶工作特性研究

Working characteristics of special-shaped blade of a small efficient pneumatic vertical pre-mixing device

为解决某交联剂在预混时溶解慢、易挥发、对操作人员危害大等问题,开发了一套采用单轴异形桨叶的可远程控制的小型高效立式气动预混装置。通过有限元方法计算了四种搅拌叶片的流场特性,分析了异形桨叶和其他三种常用桨叶的总体流型、速度流线分布。结果表明,在预混转速为45 rpm时,异形叶片可实现交联剂径向流动,使旋转中心的交联剂充分混合,有效防止中心死区的出现,展现出良好的预混性能,预混时间由人工预混的6 h缩短为2 h,乙腈溶液挥发量减少了60.8%,有效解决了交联剂挥发和挂壁析出问题,提高了交联剂的预混效率。

To address issues such as slow dissolution,volatility,and potential harm to operators during the pre-mixing process of a certain cross-linking agent,a set of small efficient pneumatic vertical pre-mixing device with remote control capability and a single-axis special-shaped blade has been developed.The flow field characteristics of four types of mixing blades were analyzed through fluid dynamics calculations,and a comparison was made between the overall flow patterns and velocity streamline distributions of the special-shaped blade and the other three commonly used blades.The results indicate that at a pre-mixing speed of 45 rpm,the special-shaped blade enables radial flow of the cross-linking agent,ensuring thorough mixing of the agent around the rotation center and effectively preventing the formation of dead zones,which demonstrates excellent pre-mixing performance.By using the special-shaped blade for pre-mixing,the pre-mixing time can be reduced from 6 h with manual mixing to 2 h.Additionally,the evaporation of the acetonitrile solution decreases by 60.8%.This approach effectively solves the issues of cross-linking agent evaporation and wall deposition,significantly improving the pre-mixing efficiency of the cross-linking agent.