Performance with respect to flue gas composition of a combined desulfurization/denitration process using powder-particle fluidized bed

A new combined desulfurization/denitration (DeSO(x)/DeNO(x)) process was te sted in this study. The process uses the so-called powder-particle fluidize d bed (PPFB) as the major reactor in which a coarse DeNO(x) catalyst, sever al hundred micrometers in size, is fluidized by flue gas as the fluidizatio n medium particles, while a continuously supplied fine DeSO(x) sorbent, sev eral to tens of micrometers in diameter, is entrained with the flue gas. Am monia for NOx reduction is fed to the bottom of the bed, thus, SOx and NOx are simultaneously removed in the single reactor. By adopting a model gas, SO2-NO-H2O-N-2-air, to simulate actual flue gas in a laboratory-scale PPFB, simultaneous SO2 and NO removals were explored with respect to various gas components of flue gas. It was found that the variations of SO2 removal wi th concentrations (fractions) of oxygen, water vapor, SO2 and NO in flue ga s are little affected by the simultaneous NOx reduction. However, the depen dencies of NO removal upon such gas components are closely related to the i nter-actions between DeSO(x) sorbent and DeNO(x) catalyst.