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

悬浮液一般表现出复杂的流动行为。这些复杂性可能是由形成内部结构的固体颗粒之间的相互作用、颗粒尺寸分布和悬浮颗粒的非球形特征引起的。本文提出了一种适用于团聚型料浆的料浆粘度预测模型。在这项研究中，我们提出了一个新的算法，以获得最大的包装体积分数。我们将粒度分布细分为两部分，即较大颗粒和较小颗粒。考虑到非球形特性，最初仅填充较大的颗粒。在填充较大颗粒之后，假设未被较大颗粒占据的空隙被非球形较小颗粒填充。该算法被证明可以很好地预测分散良好的悬浮体系。另一方面，目前的研究人员一直在讨论粘度前， 关于我们 一种适用于宽粒度分布和具有团聚性质的球形颗粒的浓缩浆料的检测方法。结合最大填充体积分数算法，提出了一种基于Tubei悬浮液流变模型的非球形悬浮液粘度预测方法。结果表明，该模型能够较好地预测粉煤灰浓浆的非牛顿粘度，并将该流变模型应用于松浦燃煤电厂排粉煤灰浓浆的非牛顿粘度预测。根据这种流变特性，设计了从燃煤电厂到控制存款场的泥浆输送系统。本研究提出一种降低运输成本之新飞灰存款系统。粉煤灰浓浆管道输送系统的可行性研究表明，与传统的带式输送机或轨道输送系统相比，管道输送系统的建设和运行成本大大降低。可行性研究的结果尚未公布，但我们计划在不久的将来提交结果。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