Experimental carbonation of CaO in an entrained flow reactor

Abstract

In this work, the feasibility of an entrained flow reactor for full decarbonisation of gas streams has been proved. Three CaO-based materials (two types of lime and calcined raw meal) with different textural properties and therefore, different CO₂ carrying capacities have been fed to the entrained flow reactor in a series of tests in which the Ca/CO₂ molar ratio and solid residence time were the operation variables studied. Up to 11 mol CO₂ m⁻² s⁻¹ has been captured from the gas phase with CaO from calcined lime with a maximum CO₂ carrying capacity of 0.57 mol CO₂ per mol CaO, reaching CO₂ capture efficiencies over 90% for a Ca/CO₂ molar ratio of 5 and solid residence times under 5 s.