Abstract

This study presents a numerical model for pressure deliquoring of compressible solids, covering both filtration and expression. A simple and easy-to-solve model for the solid/liquid system is obtained by formulating the basic flux and continuity equations for both solid and liquid phases, the momentum balance for the liquid phase (Darcy’s law) and the momentum for the solid phase (Hooke’s law). Kaolin suspension is used as a product model having elastic behaviour. A computer model was developed to simulate cake formation and cake characteristics during filtration at an individual particle level. The model was shown to be able to generate structural information and quantify the cake thickness, cake solidosity, filtrate volume, filtrate flow rate for constant pressure filtration or pressure drop across the filter unit for constant rate filtration as a function of filtration time. The numerical model of the filtration–expression process seems promising to further improvement of the understanding and control of dewatering of solid/liquid suspensions.

中文翻译：

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过滤-表达过程中的压力和孔隙率分布

摘要

这项研究提供了可压缩固体压力脱水的数值模型，涵盖了过滤和表达。通过制定固液两相基本通量和连续性方程，液相的动量平衡（达西定律）和固相的动量，可以得到固/液系统的简单易解模型。 （胡克定律）。高岭土悬浮液用作具有弹性行为的产品模型。开发了计算机模型来模拟单个颗粒水平过滤过程中的滤饼形成和滤饼特性。该模型显示出能够生成结构信息并量化滤饼厚度，滤饼固结度，滤液体积，用于恒压过滤的滤液流速，或用于恒速过滤的整个过滤单元的压降随过滤时间而变。过滤-表达过程的数值模型似乎有望进一步改善对固体/液体悬浮液脱水的理解和控制。