A series of experiments in a circulating fluidized bed (CFB) pilot plant has explored a new dry desulfurization process, using the NOx in the flue gas and a new sorbent that has been prepared from fly ash and lime. Various desulfurization operating parameters were tested for the thermodynamic, chemical, and dynamic states for temperatures of 523-673 K. TheNOx increased the calcium conversion ratio in the desulfurization process. In addition, with the NOx, the desulfurization byproduct was determined to be mostly CaSO4, instead of CaSO3, as a result of the chain reaction caused by theNOx. Therefore, theNOx in the flue gas can improve the efficiency of the dry desulfurization process.
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