HIGH-TEMPERATURE, SHORT-TIME SULFATION OF CALCIUM-BASED SORBENTS .2. EXPERIMENTAL-DATA AND THEORETICAL-MODEL PREDICTIONS

The fundamental processes for injection of CaC03and Ca(OH)2for the removal of SO2from combustion gases of coal-fired boilers are analyzed on the basis of experimental data and a comprehensive theoretical model. Sulfation data were obtained in a 30-kW isothermal gas-particle transport reactor at conditions simulating those of upper-furnace injection. The theoretical model accounts for particle structure, calcination, sintering, sulfation, and heat and mass transfer. Pore diffusion, product-layer diffusion, and sintering appear to be the principal processes that govern the rate of SO2capture for the hydrate particles of interest for commercial dry sorbent injection. © 1990, American Chemical Society. All rights reserved.