A Fluidized Bed CO₂ Recovery Process with Lithium based Dry Sorbent Particles

Abstract

For CO₂ capture at high temperature/high CO₂ partial pressure conditions, a new dry CO₂ removal sorbent was developed. The CO₂ sorbent particles were made from fine particles of lithium silicate and granulated using a tumbling fluidized bed and then coated by a layer of coarse alumina particles with a ceramic sol solution binder. The minimum fluidization velocity and adsorption/desorption properties of the sorbent particles were determined in a laboratory scale fluidized bed reactor (i.d.,0.03m) in the temperature range between 873K to 1073K. The characteristics of particle component, sphericity, and breaking behaviors were correlated with particle fluidizing behaviors. An overall conversion yield of 50% and maximum adsorption capacity of 10wt% for the sorbent particles were obtained after a 60 cycle adsorption/desorption test.