PNNL

Abstract

To accelerate the commercialization and deployment of carbon capture technologies, computational fuid dynamics (CFD)-based tools may be used to model and analyze the performance of carbon cap-ture devices. This work presents multiphase CFD-based ow simulations for the regenerator|a device responsible for extracting CO2 from CO2-loaded sorbent particles before the particles are recycled. The use of solid particle sorbents in this design is a departure from previously reported systems, where aque-ous sorbents are employed. Another new feature is the inclusion of a series of perforated plates along the regenerator height. The in uence of these plates on sorbent distribution is examined for varying sorbent holdup, uidizing gas velocity, and particle size. The residence time distribution of sorbents is also measured to classify the low regime as plug ow or well-mixed ow. The purpose of this work is to better understand the sorbent ow characteristics before reaction kinetics of CO2 desorption can be implemented.