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Impact of clustering on heterogeneous reactions in a riser
, Capecelatro J., Desjardins O., Pepiot P.
Published in
Volume: 2017-April
Risers are used in a variety of industries, where rapid mixing between gas and solid particles is essential. More recently, risers are gaining importance in some of the novel combustion technologies, such as Chemical-looping combustion and thermochemical conversion of biomass. These reactor configurations provide challenging modeling issues, as the particulate flow is characterized by a highly fluctuating solid volume fraction due to the formation of dense clusters. This may severely reduce the mixing between gas and solid particles and affect the residence time of the particles in the reactor, and thus, the extent of heterogeneous reactions between gas and solid particles. In this work, we investigate how clustering impacts heterogeneous reactions in risers using a detailed Euler-Lagrange computational framework. For this purpose, three-dimensional laboratory-scale riser simulations are performed. A simplified reaction system is used, where the solid-fluid reaction is represented by a single isothermal reaction step. To asses the effect of multiphase dynamics of the bed on the heterogeneous chemistry, the three-dimensional simulation results are compared with reduced-order models. © 2017 Eastern States Section of the Combustion Institute. All rights reserved.
About the journal
Journal10th U.S. National Combustion Meeting
Open AccessNo