Development of Fly Ash Deposit System by Hydraulic Transportation of Dense Fly Ash Slurry

悬浮液一般表现为复杂的流动行为。这些复杂性可能是由形成悬浮颗粒的内部结构、颗粒尺寸分布和非球形特征的固体颗粒之间的相互作用引起的。本文提出了一种适用于团聚浆体的浆体粘度预测模型。在这项研究中，我们提出了一种新的算法来给出最大填充体积分数。我们将颗粒大小分布细分为较大颗粒和较小颗粒两部分。考虑到颗粒的非球形特性，首先只填充较大的颗粒。在较大颗粒被填充后，假设未被较大颗粒占据的空隙被非球形较小颗粒填充。该算法被证明能够很好地预测分散良好的悬浮液系统。另一方面，目前的研究人员一直在讨论…之前的粘度对于粒度分布较宽、具有团聚性质的球形颗粒，多采用浓缩浆的方法。基于Usui的悬浮液流变模型，结合最大堆积体积分数算法，提出了非球形悬浮液粘度的预测方法。应用上述流变模型对松浦燃煤电厂排放的浓灰浆的非牛顿粘度进行了预测。基于这一流变特性，设计了从燃煤电站到受控堆场的煤泥输送系统。本研究提出了一种降低运输成本的新型飞灰堆存系统。通过对飞灰浓浆管道输送系统的可行性研究，证明该系统与通常采用带式输送机或轨道输送的系统相比，可大大降低系统的建设和运行成本。可行性研究的结果尚未公布，但我们计划在不久的将来公布结果。较少

Suspensions generally show the complex flow behavior. These complexities may be caused by interactions between solid particles forming the internal structure, particle size distribution, and non-spherical characteristics of suspended particles. The present authors have proposed a slurry viscosity prediction model which can be successfully applicable to an agglomerative slurries. In This study, we proposed a new algorism to give the maximum packing volume fraction. We subdivided the particle size distribution into two parts, i.e.larger particles and smaller particles. Only the larger particles was packed at first by taking account of the non-spherical characteristics. After the larger particles were packed, it was assumed that the void unoccupied by larger particles was packed by non-spherical smaller particles. This algorism was certified to work well for the prediction of well dispersed suspension systems. On the other hand, present investigators have been discussing the viscosity pre … More diction method of concentrated slurries for spherical particles with wide particle size distribution and with agglomerative nature. Combined with the maximum packing volume fraction algorism, the viscosity prediction method for non-spherical suspensions was proposed, which is based on Usui's suspension rheology model. It was demonstrated that the proposed model was able to predict the non-Newtonian slurry viscosity of fly ash dense slurry.The above mentioned rheology model was applied to predict the non-Newtonian viscosity of dense fly ash slurry discharged from Matsuura coal burning power station. Based on this rheology characteristic, the slurry transportation system from a coal burning power station to a controlled deposit site is designed. A new fly ash deposit system with reduced transportation cost is proposed in this study. The feasibility study of pipeline transportation system of fly ash dense slurry have proved that the proposed system could be constructed and operated with much reduce cost if it is compared with usual transportation system using a belt conveyer or tracks. The results of the feasibility study is not published yet, but we are planning to present the results in the near future. Less