Carbonation Kinetics of Ca(OH)2 Under Conditions of Entrained Reactors to Capture CO2

The use of Ca(OH)2 as a CO2 sorbent instead of CaO in calcium looping systems has the advantage of a much faster reaction rate of carbonation and a larger conversion degree to CaCO3. This work investigates the carbonation kinetics offine Ca(OH)2 particles (<10 mu m) in a range of reaction conditions (i.e., 350-650 degrees C and CO2 concentrations up to 25%v) that could be of interest for applications where a short contact time is expected between the solids and the gases (i.e., entrained bed carbonator reactors). For this purpose, experiments in a drop tube reactor with short reaction times (i.e., below 6 s) have been carried out. High carbonation conversions up to 0.7 have been measured under these conditions, supporting the viability of using entrained carbonator reactors. The experimental results have been fitted to a shirking core model, and the corresponding kinetic parameters for the carbonation reaction have been determined.

Automated summary

The study investigates the use of Ca(OH)2 as a CO2 sorbent in entrained bed carbonator reactors, with experiments showing high carbonation conversions up to 0.7 under short reaction times. The experimental results have been fitted to a shirking core model, and the kinetic parameters for the carbonation reaction have been determined.