Study of Reduced Water Washing by Novel Fluidized System

本研究的结果总结如下，对下述钻头主要研究项目进行了实验研究，并获得了有价值的结果。(1)研究了在该新型流化床中加入大密度小颗粒对床层流体力学性能和颗粒分离去除系统的影响。研究结果表明，颗粒添加的最佳操作条件和小颗粒分离去除的分布器的合理配置是可行的。(2)提出了这种新型流化床系统的流化洗涤机理，流化洗涤包括两种洗涤特征，一种是硬冲击洗涤，例如从农产品中去除泥浆，另一种是软研磨洗涤，例如从工业工厂中去除油污。该机理得到了（3）和（4）的实验结果的成功支持。(3)研究了颗粒碰撞率与涂膏试管磨损率的关系，阐明了气速、加水量和小颗粒加入量的影响。通过对比新型流化床和无颗粒鼓泡水流中的磨损特性，确定了颗粒碰撞力是影响硬冲击洗涤的主要因素。(4)另一方面，通过对标准污布的漂白试验，发现了软磨料洗涤等洗涤特性对流化洗涤的影响，从而对新型流化洗涤系统的流体力学和洗涤特性有了新的认识，为工业洗涤设备的设计提供了有效的指导。

The results of this study is summarized as follows, the bur principal research items as mentioned below were investigated experimentally and valuable results were obtained. (1) The influence of addition of small large-density particles into this novel fluidized bed on bed hydrodynamics and the particle separation and removal system were investigated The small large-density particle simulated as washing waste as mud thr farm products washing. As the result, the optimum operation condition for particle addition was presented and the appropriate configuration of distributor for small-particle separation and removal was proposed. (2) The mechanism for fluidization washing in this novel fluidized system was proposed, ie., the fluidization washing composed of two washing characteristics, one is a hard-impact washing such as mud removal from farm products and another is a soft-abrasive washing such as oil soil removal from industrial works. The mechanism was supported successfully by the next experimental results of (3) and (4). (3) The relationship between particle collision fare and attrition rate of the test tube covered with plaster layer was investigated and the influence of gas velocity, addition of water and addition of small particles were clarified. Comparing with the attrition characteristics in both the novel fluidized bed and the bubbling water flow without any particles, the principal factor for a hard-impact washing was identified the particle collision force. (4) On the other hand, from the result of whitening test of standard soiled cloth covered the test tube, another washing characteristics such as soft-abrasive washing also acts far fluidization washing.These whole findings give a new scientific understanding about hydrodynamics and washing characteristics of this novel fluidized system and also give an effective design guideline for industrial washing devices as the application of this fluidized system.