# CFD-PBE Simulation of a CO2 Capture Process Using Solid Sorbents

Experimental data in the literature (Yi et al. 2007) on fresh, carbonated, and regenerated sorbent particles in the CO_{2} capture process using solid sorbents have shown that the sorbent particle size distribution essentially remains constant during the carbonation and regeneration processes. However, the mass of the sorbent particle changes during both the sorption (mass gain) and regeneration processes (mass loss), which leads to the changes in the density of the particles. Consequently, the particles go through a structural change (e.g., change in porosity distribution).

## Problem

Consider the example provided in Case 2, and assume that the solid sorbent entering the reactor has a unimodal density distribution representing a partially regenerated sorbent as shown in Fig. 5.8 in dimensionless form. The probability density function spans between a minimum density (i.e., 2480 kg/m^{3}) corresponding to

**Fig. 5.8 **Particle density distribution function at the inlet (This figure was originally published in *Powder Technol* 286, 2015 and has been reused with permission)

the fresh sorbent and a maximum density (i.e., 2830 kg/m^{3}) corresponding to the fully reacted sorbent. The mean density value at the solid inlet is 2569 kg/m^{3}. Develop a CFD-based model and numerical solution to calculate the variation in particle density during this carbonation process.