Dynamic simulation of technical precipitation processes

技术沉淀过程动态模拟

• 批准号: 238118532
• 负责人: Professor Dr.-Ing. Matthias Kind
• 金额: --
• 依托单位: Institut für Thermische Verfahrenstechnik (TVT)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/238118532?language=en
• 关键词: Dynamic; simulation; technical; precipitation; processes

Precipitation is an important operation of interconnected solid processes. Precipitation dynamics originate from the complex coupling of fast primary processes (mixing, nucleation, growth...) with secondary processes (agglomeration, ripening, ...) and instationary operating conditions on a wide-stretched timescale. The stirred-tank reactor, which is often used in industrial processes, exhibits inhomogeneity in turbulence, flow field and in the composition. For this reason, numerical description is difficult and depicting relevant process times (minutes or hours) for technical precipitation processes in closed simulations is not possible. Hybrid methods are required. Therefore, the aim of this project is the development of a new methodology for the simulation of complex technical precipitation processes.In the current second funding period a hybrid module for the flow sheet simulation of precipitation in stirred-tank reactors was developed. This model is based on a compartment method. The described complex system is depicted by interconnected compartments (mixing- and residence-time-compartment) integrated in the framework program (Dyssol), which is developed by the central project in SPP 1679. This method allows the decoupling of the primary processes in the area of feed inlet from the complex flow field- or mixing conditions and secondary processes in the reactor. Experiments in the second funding period for one operating point prove impressively the validity of the compartment method.In the third funding period the research is now focused on the extension of the compartment model over the whole width of technical relevant process operating points. The mixing compartment is therefore approximated as a 'Jet in Cross Flow' arrangement with variable parameters. Besides own methods from the first funding period, methods from the group Segets/Peukert are considered for this model. For a separate validation of the numerical model for the 'Jet in Cross Flow' arrangement precipitation experiments, PIV and LIF measurements shall be done for this arrangement. The predictive abilities of the whole hybrid model shall be investigated with experimental and literature data of the bulk-reactor. Transfer to different crystal substances is tested. The influence of the apparatus size (scale up) shall be investigated through the choice of different exchange streams between the compartments based on fluid dynamic considerations. By connecting with the resulting flow sheet module 'decanter centrifuge' (group Nirschl) dynamics and the performance of Dyssol for an interconnected, precipitation-exceeding, dynamic process with recirculation of particles shall be demonstrated.

沉淀是相互关联的固体过程的重要操作。降水动力学源于快速初级过程（混合、成核、生长...）与次级过程（团聚、熟化...）以及宽时间尺度上的稳态操作条件的复杂耦合。工业生产过程中经常使用的搅拌釜反应器在湍流、流场和组成方面表现出不均匀性。因此，数值描述很困难，并且不可能在封闭模拟中描述技术降水过程的相关过程时间（分钟或小时）。需要混合方法。因此，该项目的目标是开发一种新的方法来模拟复杂的技术沉淀过程。在当前的第二资助期内，开发了一种用于搅拌釜反应器中沉淀的流程图模拟的混合模块。该模型基于隔室法。所描述的复杂系统由集成在框架程序（Dyssol）中的互连隔室（混合和停留时间隔室）来描述，该框架程序是由 SPP 1679 的中心项目开发的。这种方法允许将主要过程解耦。反应器中复杂流场或混合条件和二次过程的进料入口区域。第二资助期针对一个操作点的实验令人印象深刻地证明了隔室方法的有效性。在第三资助期，研究的重点是隔室模型在技术相关过程操作点的整个宽度上的扩展。因此，混合室近似为具有可变参数的“错流射流”布置。除了第一个资助期自己的方法外，该模型还考虑了 Segets/Peukert 小组的方法。为了单独验证“错流射流”布置降水实验的数值模型，应对该布置进行 PIV 和 LIF 测量。整个混合模型的预测能力应通过本体反应器的实验和文献数据进行研究。测试了向不同晶体物质的转移。应根据流体动力学考虑，通过选择隔室之间的不同交换流来研究设备尺寸（放大）的影响。通过与生成的流程模块“卧螺离心机”（Nirschl 集团）相连接，Dyssol 的动力学和性能将在相互关联、超沉淀、颗粒再循环的动态过程中得到证明。