Characterization of the performances of an innovative heat-exchanger-reactorReport as inadecuate




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1 LGC - Laboratoire de génie chimique 2 Commissariat à l-Énergie Atomique et aux Énergies Alternatives CEA - Grenoble

Abstract : The use of heat exchanger-reactors HEX-reactors is a promising way to overcome the barrier of poor heat transfer in batch reactors. However to reach residence time long enough to complete the chemistry,low Reynolds number has to be combined with both a plug flow behaviour and the intensification of heat and mass transfers. This work concerns the experimental approach used to characterize an innovative HEX-reactor. The pilot is made of three process plates sandwiched between five utility plates. The process stream flows in a 2 mm corrugated channel. Pressure drop and residence time distribution characterizations aim at studying the flow hydrodynamics. Identified Darcy correlations point out the transition between laminar and turbulent flow around a Reynolds number equal to 200. Moreover the flow behaves like a quasi-plug flow Pe > 185. The heat transfer and mixing time have also been investigated. The ratio between the reaction kinetics and the mixing time is over 100 and the intensification factor ranges from5000 to 8000 kW m−3K−1. As a consequence, no limitations were identified which allows the implementation of an exothermic reaction. It has been successfully performed under severe temperature and concentration conditions, batchwise unreachable. Thus, it highlights the interest of using this continuous HEX-reactor.

Keywords : Heat exchanger-reactor Corrugated flow Exothermal reaction Continuous mode Heat and mass transfer intensification





Author: Felicie Théron - Zoé Anxionnaz-Minvielle - Michel Cabassud - Christophe Gourdon - Patrice Tochon -

Source: https://hal.archives-ouvertes.fr/



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