Development of models for multi-phase processes in the pore system of a filter cake on the basis of 3D-information

滤饼过滤属于机械脱水工艺。这些是化工、制药、生物技术、食品、材料和矿产行业众多生产线的核心步骤。主要任务是从悬浮液中有效地分离颗粒固体。这一领域的数值研究已经产生了关于理想化颗粒的局部饼结构以及多孔介质中流动的详细的科学知识。另一方面，工程解决方案仍然使用高度简化的一维方法。这是因为，直到几年前，还不可能产生关于孔隙体积性质的详细信息。因此，在工程计算和工艺设计中必须使用积分参数。该项目分为两个阶段，这两个阶段结合在一起，可以更好地对滤饼的机械脱水过程进行技术描述。孔隙系统本身以高分辨率计算机层析成像为特征。这些数据集将被用来开发孔隙系统的结构模型。该模型的核心是特征分布参数的定义。颗粒表征的分布参数，如大小和形状，将与孔结构的分布参数相关联。通过这种方法，可以使用颗粒表征来确定滤饼的加工特性。颗粒数据与孔隙和过程数据的连接使用了一种捷径方法。为了实现对孔隙结构的真实三维理解，层析数据将在3D虚拟现实环境中可视化。这将使我们能够建立一个结构模型，它基于真正的3D理解。多孔渗流技术方面的量化采用了结构模型。它的目的是为每个物理效果使用正确的分布几何参数。这允许毛细和摩擦效应的分离，在已建立的方法中，这两种效应使用相同的几何参数(水力直径)。过程模型将简化问题，因为它将有可能使用工程计算方法。这避免了应用耗费时间和资源的数值方法。这进一步允许过滤和气体差压脱水过程的快速和令人信服的定量设计。过程控制和自动化以及相互关联的仿真工具需要模型，而模型只需要有限的计算能力。他们需要快速计算来对其他过程做出反应。利用最短路径结构和过程模型，可以从输入的信息中分别计算出结果和脱水率，这些信息都是分布的颗粒属性。

Cake filtration belongs to the mechanical de-watering processes. These are a central step in numerous production lines of the chemical, pharmaceutical, biotechnological, food-, materials- and minerals industry. The main task is the efficient separation of particulate solids from the suspension liquid. The numerical investigations in this field have led to detailed scientific knowledge of the local cake structuring regarding idealized particles as well as of the flow in porous media. On the other hand, the engineering solutions still use strongly simplified 1D-approaches. This is due to the fact, that until some years ago it was quite impossible to generate detailed information on the properties of the pore volume. Therefore, integral parameters had to be used for the engineering calculations and the process design. The project is divided into two stages, which are combined to allow a better technological description of the mechanical de-watering processes of filter cakes. The pore system itself is characterized by high-resolution computer-tomography. These data sets will be used to develop a structure model of the pore system. The central point of this model is the definition of characteristic distributed parameters. The distributed parameters of the particle characterization, e.g. size and form, will be correlated with the distributed parameters of the pore structure. With this approach, it will become possible to determine the processing properties of the filter cake using the particle characterization. The connection of particle data with pore and process data uses a short cut approach. To achieve a real three-dimensional understanding of the pore structure, the tomography data will be visualized in a 3D virtual reality surrounding. This will enable us to set up a structural model, which bases on a real 3D understanding. The quantification of the technological aspects of porous flow applies the structure model. It aims at using the right distributed geometrical parameters for each physical effect. This allows a decoupling of capillary and friction effects, which in the established approaches use the same geometrical parameter (the hydraulic diameter). The process model will simplify the problem, for that it will be possible to use engineering calculation approaches. This avoids the application of time and resources consuming numerical methods. This further allows a rapid and still quantitative convincing design of filtration and gas differential pressure de-watering processes. Process control and automation as well as interlinked simulation tools need models, which only require a limited calculation capacity. They need rapid calculations to react on other processes. Using the short-cut structure and process model the result, the de-watering respectively, can be calculated from the input information, which are distributed particle properties.