轻密度细长固体固液体系搅拌研究

发布时间：2018-03-31 23:13

本文选题：固-液搅拌　切入点：细长固体　出处：《北京化工大学》2015年硕士论文

【摘要】：在工业固-液搅拌操作中,经常出现一些纤维状细长固体附着与搅拌轴和搅拌叶轮的现象,这种细长固体的附着增大了搅拌功率的消耗和设备的机械损伤,可能导致搅拌叶轮的振动和过载。不但大大降低了搅拌效率,还使设备维护成本增加,造成生产效果大幅降低。根据以上的问题,本文希望通过对传统工业用桨CBY搅拌桨桨型的改进,改善细长固体附着搅拌轴和搅拌叶轮问题。本课题探究工业常用搅拌桨在固-液搅拌中的自清洁能力,以水、不同材质的纤维状细长固体模拟工业固-液混合体系。根据现有的相关专利和文献,探究出一种新型的具有自清洁能力的两叶圆盘搅拌桨。通过实验得出不同搅拌桨的功率准数以及附着固体物料后功率的变化。并且以控制变量法探究桨型结构、物性等变量对搅拌桨清洁能力的影响。并用CFD数值模拟自清洁搅拌桨的流场和流型图,比较其与CBY搅拌桨的流场不同。通过实验数据的处理比对,分析搅拌桨在细长固体搅拌过程中各性能参数的改变,为实际工业固-液搅拌操作提供实验指导。
[Abstract]:In industrial solid-liquid stirring operation, some fibrous slender solids are often attached to the agitating shaft and impeller, which increase the consumption of mixing power and mechanical damage of equipment. May lead to vibration and overload of the impeller. Not only greatly reduce the agitation efficiency, but also increase the maintenance cost of equipment, resulting in a significant reduction in production efficiency. This paper hopes to improve the slender solid attachment and impeller by improving the CBY propeller type of traditional industrial propeller. This subject explores the self-cleaning ability of the conventional industrial agitator in solid-liquid agitation, using water, water, water, water, water, water, water, water, water, water, water, water, water, water, water, water, water, water, etc. Fibrous slender solids simulating industrial solid-liquid mixtures of different materials. According to existing patents and literature, A new type of self-cleaning two-leaf disk agitator was developed. The power standard number of different impellers and the change of power after attachment to solid materials were obtained by experiments, and the propeller structure was investigated by controlling variable method. The effects of physical properties and other variables on the cleaning ability of the impeller are studied. The flow field and flow pattern of the self-cleaning impeller are simulated by CFD numerical simulation, and the flow field is compared with that of the CBY impeller. The experimental data are processed and compared. The change of the performance parameters of the propeller in the slender solid stirring process is analyzed, which provides experimental guidance for the practical industrial solid-liquid stirring operation.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ027.2

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