Abstract
Fischer-Tropsch synthesis may be a solution for converting volatile renewable energies into storable liquid fuel. Microstructured reactors have been proven to cope with varying operation conditions and are able to adapt to fluctuations in this circumstance. In this regard, a suitable kinetic model for chemical synthesis is essential for the prediction of reactor and catalyst behavior. The assessment and description of the reactor and plant response during dynamic operation must also be considered to develop a control system for varying operating conditions. In this work, a time-resolved model for the description of relevant processes inside a pilot scale microstructured Fischer-Tropsch reactor and the associated test rig including the product condensation stages is presented. A residence time distribution model describes flow and mixing behavior for all system components. Time and temperature-dependent product concentration in the product traps is determined by vapor–liquid-equilibrium calculation. Phase equilibria models with ideal and real phase behavior assumptions are compared. A micro-kinetic model was adapted with good agreement to a variety of experimental data. When coupled, the overall model is able to predict time-resolved product characteristics based on process conditions and feed only. This mathematical description may be of use for decentralized plants in the future.
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