| Abstract
| - The effects of NOx, CO2, and reaction temperature on the SO2 removal process have beeninvestigated in a fluidized bed reactor by using CaO/fly ash sorbent in order to demonstrate anyavailable method to promote the calcium utilization rate and form valuable gypsum as a byproductfor the dry desulfurization process. It was found that NOx increased the selectivity of CaSO4 asthe final product in the sorbent during the desulfurization process. The effect of NOx on SO2removal rate was also investigated and results showed that the presence of NOx enhanced theSO2 removal rate, even when mole ratio of NO/SO2 was less than 1.0. It was deduced that thereaction mechanism involved NOx-related chain reactions. On the basis of FTIR analysis ofreactions product, the chain reaction mechanism could be outlined that Ca(NO3)2 was formedfrom the reaction of Ca(OH)2 with NO2, and then Ca(NO3)2 reacts with SO2 to form CaSO4 +NO. On the other hand, it was found that the CO2 negative effect on SO2 removal was reducedwith NOx presence.
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