Dynamic process models for ultra fine grinding and dispersion

DynSim-FP 1679程序的主要目标是为固态过程工程领域中不同设备和机器的网络化固态过程的动态模拟提供数值工具。特别地，搅拌介质磨用于细粉碎和分散。为了通过描述传递行为、功率输入和粉碎行为来模拟这一过程，存在部分经验但也基于物理的模型。到目前为止，这些模型仅限于在精细研磨领域的固定磨机操作。因此，没有搅拌介质磨机的模型，允许在材料和操作参数变化下预测粒度分布或颗粒形状变化的动态模拟。在动态模拟中，过程模型必须能够再现在磨机运行过程中受操作参数变化影响的产品粒度分布。在这个项目的背景下，这个目标是通过将人口平衡模型与连续磨机操作的应力和材料模型相结合来实现的。在第一个资助期内，中心重点是批量操作系统的粉碎、粘度和功耗描述模型的概念和耦合。在第二个基金周期内，该模型通过物资运输和物资分配模型扩展为连续操作系统。此外，还建立了一种校准模型参数的方法，特别是破碎率和破碎函数，特别是应用模型参数和定义的生产二氧化硅骨料体系。在分散过程中，破碎函数有很大的不同，必须单独考虑。使用过的骨料系统的材料功能及其向商业骨料系统的转移将在第三个供资期间发展。此外，将连续过程模型集成到SPP仿真环境和模型扩展中，应考虑产品颗粒的捕获概率、多重应力和颗粒形状变化。为了表示其动态特性，连续运行的磨机还与混合容器和分级机相连。

The main objective of the DynSim-FP 1679 program is to provide numerical tools for a dynamic simulation of networked solid-state processes with different devices and machines in the field of solid-state process engineering. In particular, stirred media mill are used for fine comminution and dispersion. Partially empirical but also physically based models exist in order to model this process by describing the transport behavior, the power input and the comminution behavior.To date, these models have been limited to stationary mill operation in the area of the fine grinding. Hence, there are no models for stirred media mill that allow a predictive dynamic simulation of the particle size distribution or particle shape change under variations in material and operating parameters. In a dynamic simulation, the process model must be able to reproduce the product particle size distribution subjected to changes in operating parameters as it occurs during the operation of the mill. In the context of this project, this goal is to be achieved by coupling the population balance model with a stress and material model for continuous mill operations.Throughout the first funding period, the central focus was on the conception and coupling of the models for the description of comminution, viscosity and power consumption for batch operation systems. Within the second fund period, the model has been expanded to continuous operation systems via a material transport and material distribution model. Additionally, a method for calibrating the model parameters, specially breaking rate and breaking function, has been established in particular for applied model parameters and defined produced silicon dioxide aggregate systems. The breakage function differs significantly during dispersing processes and must be considered individually. The material function for the used aggregate systems as well as its transfer to a commercial aggregate system is to be developed in the third funding period. In addition, the integration of the continuous process model into the SPP simulation environment and model extansion should include the capture probability of product particles, multiple stresses and particle shape change. For the representation of the dynamic behavior, the continuous operating mill is also connected with a mixing vessel and a classifier.