Auslegung und Optimierung von hybriden Trennverfahren

Design and Optimization of Hybrid Separation Processes Hybrid separation processes are defined as the combination of at least two different unit operations in different apparatus which contribute to the separation task. Hybrid processes are used for difficult separations, e.g., close‐boiling mixtures and azeotropes, if a single unit operation, e.g., distillation, membranes, extraction, crystallization or chromatography, is not efficient or even not feasible. Because of the structure of a hybrid process which implies two or more unit operations and recycle streams, the design is not straightforward and therefore subject of today's research. In this work general criteria for such a consistent design method are described and a design approach for hybrid separation processes is presented. It bases on rigorous modeling of the unit operations and simultaneous multivariable optimization. The approach feasibility is demonstrated by the separation of an isomer mixture.     

Numerische Methoden zur Auslegung von Rührsystemen

Numerical methods are established tools for the design of stirring systems. CFD describes flow conditions in the reactors and provides information on the process result. Dynamic loads of components due to the agitator flow can therefore be predicted reliably. They serve as input for the calculation of stresses and deformations using FEM. Especially turbulent flows induce dynamic loads that excite internals and bring them to resonance. Such conditions can be predicted by the modal analysis. The described tools contribute to the reliable design and efficiency of production.     

Einsatz von Prozessberechnungsprogrammen zur Optimierung fortschrittlicher Dampfkraftprozesse

Computational tools are used for the design analysis of power plant cycles. Combination of these with optimisation codes yields efficient optimisation of both cycle topology and cycle parameters. The efficiency of these tools is demonstrated for an advanced steam cycle with double reheating and multiple feed water preheating. For feed water preheating, it is shown that the optimum total amount of preheating, represented by the maximum pressure level of steam extraction, is largely decoupled from the distribution of the individual pressure levels of the succeeding stages of steam extraction.     

Numerische Bestimmung der Durchgangsrate von Partikeln durch eine Porengeometrie

The translocation of big particles through narrow pores is a very rare event. Therefore, it is not efficient to determine the translocation rate by the means of traditional simulation techniques. In this work, the translocation rate of a spherical particle through a pore was determined using Forward Flux Sampling (FFS). These results were compared to the results obtained by applying traditional simulation techniques.