(663c) Two Dimensional Simulation of Carbon Capture Using Amine-Based Solid Sorbents

Chemical sorption of CO₂ by selective solid sorbents has been considered as promising method with the potential to be economically feasible for carbon dioxide removal from syngas. To obtain better understanding of CO2 capture using solid sorbents, in this study two dimensional CFD simulation of the circulation fluidized bed carbon capture process, based on NETL (National Energy Technology Lab) setup, using amine based solid sorbents has been performed.

The Eulerian-Eulerian two fluid model equations are used to do 2D numerical simulation. Particles interaction is analyzed using kinetic theory based granular flow model along with frictional stress and viscosity for the dense solid flow regimes. Two dimensional CFD simulation (Continuity and momentum conservation equations) were performed without including the carbonation and regeneration reactions. The results of the two-dimensional simulation were compared with experimental data to study the effect of particle stress models, restitution coefficient and specularity coefficient on the flow of the solids at the Circulating Fluidized Bed (CFB) carbon capture unit.

In the second part of the study, carbonation and regeneration heterogenous reactions was added to the CFD model. So, species conservation and energy conservation equations were also solved to calculate the rate and extend of CO₂ sorption and temperature distribution in the system.