Process Modeling for dynamic particle separation processes

在SPP1679开发的框架中实现了静电除尘器内部分离和沉淀的流程模拟（FSS）模块。因此，数值和实验颗粒分析推导出沉淀和再分散函数，允许基于工艺参数，几何变化和材料特性的缩放。在项目的第一和第二阶段，模型材料（Ulmer Weiß和Pural NF）的应用证明了材料依赖的动态降水。从除尘器分离壁上提取的代表性样品的显微镜分析显示，这些材料的表面结构不均匀。Ulmer Weiß建立了一个与时间无关的光滑表面，而Pural NF层在整个过程中不断变粗。仿真结果显示了粒子依赖的有效电场及其对分离曲线的影响。这些场的振幅和形式会根据电极的设计而改变。宏观FSS模型通过包含每个几何形状的有效场参数来匹配CFD分离曲线。在项目的第三阶段，重点是设施动态和工业设施规模、材料系统和气候条件的缩放。扩展了流程图过程模型，其中内部过程动力学由来自层的粒子再夹带表示。在spp1679 （Z项目）中开发的框架中实现了派生的过程模块。该模型应表明动态分离过程在FSS中可以用设备、工艺条件和材料的函数表示。

Modules for flow sheet simulation (FSS) of separation and precipitation inside electrostatic precipitators are implemented into the framework developed within the SPP1679. Hereby, numerical and experimental particle analysis derive precipitation and redispersion functions, that allow scaling based on process parameters, geometry variation and material properties.In the first and second phases of the project, application of model materials (Ulmer Weiß and Pural NF) demonstrated material dependent dynamic precipitation. Microscope analysis of representative samples extracted from the separation wall of the precipitator revealed unequal surface structures for these materials. Ulmer Weiß builds a time independent smooth surface while Pural NF layers roughen continuously throughout the process. Simulative results display the particle reliant effective electric field and its influence on the separation curve. These fields change their amplitude and form according to the electrode design. The macroscopic FSS model matches the CFD separation curves by including an effective field parameter for each geometry.In the projects third period in focus are facility dynamics and scaling to industrial facility sizes, material systems and climatic conditions. The flow sheet process model is extended, whereby internal process dynamics are represented by particle re-entrainment from layers.The derived process modules are implemented into the frame work developed in the course of the SPP 1679 (Z project). The model should show that dynamic separation processes are representable in FSS by functions of facility, process conditions and material.