Realization and analysis of jet-based direct mixing gas phase aggregation for the formation of hetero-aggregates with new properties

基于喷射的直接混合气相聚集形成新性能异质聚集体的实现和分析

• 批准号: 462460600
• 负责人: Professor Dr.-Ing. Harald Kruggel-Emden
• 金额: --
• 依托单位: Fachgebiet Mechanische Verfahrenstechnik und Aufbereitung (MVTA)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/462460600?language=en
• 关键词: Realization; analysis; jet; based; direct

Overall aim of the proposed research work is to contribute to the development of new particulate products based on hetero-aggregates being formed in the gas phase. To reach this goal it is first required to establish gas phase-based processes which allow the controlled formation of hetero-aggregates in sufficient quantity and quality. As these processes are clearly still lacking, a jet-based process is proposed, realized and simulated as part of the first funding period of SPP 2289 applied for here by the groups of Kruggel-Emden at Technische Universität Berlin and Schmidt at Bergische Universität Wuppertal. The jet-based process consists of three steps. In a first step the different primary particles are isolated as part of a carrier gas stream after a possible disaggregation has taken place if required. In a second step the jets with the different primary particles interact with each other allowing for the contact of the different primary particles enabling the formation of hetero-aggregates. In a third step the formed hetero-aggregates need to be removed from the jet interaction zone in a controlled way. Note that thermal stabilization is not considered as part of the first funding period here. Currently the process parameters of the outlined process as well as the three subprocesses are unknown with respect to optimizing throughput and quality of the formed hetero-aggregates. The latter overall process including the three subprocesses should be therefore investigated which requires a process analysis which can be performed based on an analysis of the aggregates formed done off-line by sampling, however methods to get spatially resolved insights into the process by laser diffraction and flow analysis should be also explored to understand about the relevant subprocesses. Additionally, the structure of the formed hetero-aggregates should be evaluated by off-line performed imaging techniques (SEM, EDX) to link structure with single aggregate properties. Furthermore, as the time- and length-scales are small and therefore challenging, the gas phase-based process is recreated as part of a DEM/CFD. After an appropriate model calibration and model validation which is achieved by in detail benchmarking with the experimental investigations, it is thereby aimed for to learn about process details which are not accessible experimentally as part of funding period one. Thereby, the modelling aims for providing all necessary ingredients to perform ab-initio process design in the future which is essential to contribute to the overall aim of developing new particulate products based on hetero-aggregates in the future. The bulk behavior and underlying properties of the hetero-aggregates as well as the optimization of such properties are not part of the first funding period being applied for here, but part of the second whereby the combined tasks from funding period one and two will allow to reach the aforementioned overall aim of the proposed project.

拟议的研究工作的总体目标是促进基于在气相中形成的异质聚集体的新颗粒产品的开发。为了达到这一目标，首先需要建立基于气相的方法，其允许以足够的数量和质量受控地形成异质聚集体。由于这些过程显然仍然缺乏，提出了一个基于喷气的过程，实现和模拟的SPP 2289的第一个资助期的一部分，在这里申请的Kruggel-Emden集团在工业大学柏林和施密特在Bergische大学伍珀塔尔。基于喷射的过程包括三个步骤。在第一步骤中，如果需要，在可能的解聚已经发生之后，将不同的初级颗粒作为载气流的一部分分离。在第二步骤中，具有不同初级颗粒的射流彼此相互作用，允许不同初级颗粒的接触，从而能够形成异质聚集体。在第三步中，需要以受控的方式从射流相互作用区去除形成的杂聚集体。请注意，此处不将热稳定视为第一个供资期的一部分。目前，所概述的工艺以及三个子工艺的工艺参数在优化所形成的异质聚集体的产量和质量方面是未知的。因此，应研究包括三个子过程的后一个整体过程，这需要基于通过采样离线完成的聚集体分析进行过程分析，但是还应探索通过激光衍射和流动分析获得空间解析的方法，以了解相关的子过程。此外，所形成的异质聚集体的结构应通过离线进行成像技术（SEM、EDX）来评估，以将结构与单一聚集体性质联系起来。此外，由于时间和长度尺度很小，因此具有挑战性，基于气相的过程被重新创建为DEM/CFD的一部分。经过适当的模型校准和模型验证，这是实现了详细的基准与实验研究，它的目的是了解过程的细节，这是无法获得实验作为供资期一的一部分。因此，建模的目的是提供所有必要的成分，以执行从头开始的过程设计在未来，这是必不可少的，以促进开发新的颗粒产品的总体目标的基础上异质聚集体在未来。异质聚集体的整体行为和基本特性以及这些特性的优化不是这里应用的第一个资助期的一部分，而是第二个资助期的一部分，其中第一个和第二个资助期的合并任务将允许实现拟议项目的上述总体目标。