Abstract
The reactor-regenerator loop is the core facility of the maximizing iso-paraffin (MIP) process. Although the discrete particle method (DPM) simulation can provide detailed information at the particle scale, it has been unable to simulate such a complex loop system due to limitations of coarse-grained (CG) models, computing software, and hardware. In this study, a newly proposed soft-shell CG-DPM model with a CG ratio of up to 800 is used to simulate a 3.5 Mt/a industrial-scale MIP reactor-regenerator loop. The solid fraction distribution obtained is found to agree well with in-situ measurements. Hydrodynamic properties including the distribution of solid fraction, gas and solid velocity, standard derivation of solid fraction with time, temporal distribution of the flow field, and particle residence time distribution are measured in the simulation, which are meaningful to better design and operate such systems in the future.
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