Process Technology of hot gas atomization process for rheological complex liquid feed for production of powders with given properties

流变复合液体原料热气雾化工艺生产特定性能粉末

基本信息

批准号：
122715930
负责人：
Professor Dr.-Ing. Udo Fritsching
金额：
--
依托单位：
Abteilung Verfahrenstechnik
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/122715930?language=en
关键词：
Process Technology hot gas atomization

项目摘要

The object of this reasearch project is the design of spray processes for the production of powder material from feed materials with complex rheology using hot gas as assisting fluid. The process design includes the experimental analysis of the breakup of complex viscous media, the multiscale process simulation and the powder production with the hot-gas atomization process at pilot-scale. The atomization of complex-viscous feed materials (e.g. with viscoelastic behaviour) is of great importance in industrial applications. Under conventional atomization process conditions the breakup of liquids with complex rheology may not be complete. This results in a high fiber fraction within the product. The aim of the project is to enhance the atomization effectivity with the use of hot gas in an external mixing twin-fluid atomizer. The hot air is also used to directly dry the spray droplets. The resulting drying kinetics are predicted applying multiscale simulations. Thus the influence of integral as well as local flow phenomena on the heat and mass transfer in the spray can be analysed. For instance the local clustering of droplets has a huge impact on the drying behaviour of individiual droplets. The main objective of the project is the deterministic prediction of a process frame, wherein the desired product properties (powder properties) within the hot gas atomization process can be produced taking into account the safety and stability of the process.

该重新搜索项目的目的是设计喷雾工艺，以使用热气作为辅助流体的复杂流变物生产粉末材料。该过程设计包括对复杂粘性介质的分解，多尺度工艺模拟和粉末产生的分析，并在试验尺度的热气雾化过程中产生粉末。在工业应用中，复杂的粘合饲料材料（例如具有粘弹性行为）的雾化非常重要。在常规的雾化过程条件下，具有复杂流变学的液体破裂可能尚不完整。这导致产品内的纤维分数很高。该项目的目的是通过在外部混合双流体雾化器中使用热气体来增强雾化的有效性。热空气还用于直接干燥喷雾液滴。预计所得的干燥动力学将应用多尺度模拟。因此，可以分析积分和局部流动现象对喷雾中热量和质量转移的影响。例如，液滴的局部聚类对个体液滴的干燥行为产生了巨大影响。该项目的主要目的是对过程框架的确定性预测，其中，可以考虑到过程的安全性和稳定性，其中可以产生热气雾化过程中所需的产品性能（粉末性能）。