Abstract
A study of the behavior of different sorbents (3 limestones, a commercial calcium carbonate and a commercial calcium hydroxide) in the sulfation process has been carried out in a drop-tube, using similar conditions to those existing in sorbent injection in pulverized-coal boilers. The main variables affecting the sulfation process have been analyzed, namely, Ca S molar ratio, SO 2 concentration, temperature, sorbent particle size and reaction time. The work concentrates on the evolution of the porous system in the sorbents and its influence on their sulfation capacity. A direct relation between chemical structure (calcium hydroxide-calcium carbonate) and sorbent reactivity was not found. Sorbents with a widespread pore size distribution with pores above 100 Å showed the highest reactivity and sulfation capacity, maintaining pores of small size (under 80 Å) at all times and operating conditions. In the less reactive sorbents, pores less than 80 Å became blocked during sulfation, being more sensitive to the effect of the different operating variables affecting the sulfation process.
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