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

基于 3D 信息开发滤饼孔隙系统中的多相过程模型

• 批准号: 321751388
• 负责人: Professor Dr.-Ing. Urs Peuker
• 金额: --
• 依托单位: Institut für Mechanische Verfahrenstechnik und Aufbereitungstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/321751388?language=en
• 关键词: Development; models; multi; phase; processes

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.

滤饼过滤属于机械脱水过程。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分离颗粒固体。在这一领域的数值研究导致了详细的科学知识的局部饼结构的理想化颗粒以及多孔介质中的流动。另一方面，工程解决方案仍然使用高度简化的一维方法。这是由于这样的事实，即直到几年前，它是相当不可能产生详细的信息的性质的孔隙体积。因此，在工程计算和工艺设计中必须采用积分参数。该项目分为两个阶段，将两个阶段结合起来，以便更好地描述滤饼机械脱水过程。孔隙系统本身的特点是高分辨率计算机断层扫描。这些数据集将用于开发孔隙系统的结构模型。该模型的中心点是特征分布参数的定义。颗粒表征的分布参数，例如尺寸和形状，将与孔结构的分布参数相关。通过这种方法，将有可能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捷径方法。为了实现对孔隙结构的真实的三维理解，断层扫描数据将在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，这是基于一个真实的三维理解。多孔流的技术方面的量化应用结构模型。它的目的是使用正确的分布几何参数的每一个物理效应。这允许毛细管和摩擦效应的解耦，其在所建立的方法中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且仍然定量的令人信服的设计。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。它们需要快速计算才能对其他过程做出反应。使用简化结构和过程模型，可以从输入信息（其是分布的颗粒特性）分别计算结果（脱水）。