The simultaneous calcination and sintering of calcium based sorbents undera combustion atmosphere

Changes in surface area during the calcination of calcium based sorbents we re measured for two limestones and one dolomite that were calcined in a dro p tube reactor, under an atmosphere of CO2, O-2, H2O and N-2 Particle size ranged from 75 to 106 mu m, and calcination was conducted at temperatures b etween 1123 and 1323 K, and residence times between 0.2 and 0.9 s. The evol ution of surface area was modelled using a simultaneous calcination and sin tering model. By fitting the model to experimental results, it was possible to employ measured calcination rates and surface area data to estimate the apparent sintering rates of the three sorbents under a combustion atmosphe re. (C) 2000 Elsevier Science Ltd. All rights reserved.