REMOVAL OF NITRIC-OXIDE FROM FLUE-GAS WITH IRON THIOCHELATE AQUEOUS-SOLUTION IN A TURBULENT CONTACT ABSORBER

An iron(II) thiochelate has been developed for use as an additive in a wet flue gas scrubber for simultaneous removal of SO2 and NOx from fl ue gas. The additive enhances the solubility of NO in scrubbing liquor by binding NO to form an iron nitrosyl thiochelate. The effect of oxy gen on NO absorption in iron(II) thiochelate aqueous solutions, as wel l as in iron(II)(EDTA) solutions, has been studied. The results showed that the iron(II) thiochelate is more resistant to oxidation by oxyge n than the conventional iron(II)(EDTA) additive. Parametric studies of the absorption efficiency of NO were performed in a bench-scale Turbu lent Contact Absorber (TCR). Based on the bench-scale test results, a prediction of the performance of a full-scale spray absorber has been made.