"\"The most common commercial process for SO 2 removal from flue gas is the wet limestone flue gas . desulfurization process, in which sulfite oxidation represents an important limiting phenomenon. A detailed . knowledge of the oxidation process is important to determine the dewatering properties of the sludge . produced, and a good understanding of the oxidation kinetics is also useful for the development of . computer codes aimed at modeling the whole flue gas desulfurization process. Sulfite oxidation was . studied both in homogeneous conditions, obtained by contacting a sulfite solution with an oxygen . saturated solution, and in heterogeneous conditions, obtained by contacting a sulfurous solution with an . oxygen containing gas phase. As far as the bisulfite oxidation reaction in heterogeneous conditions is . concerned, a previous experimental study by the same research group in absolute catalyst free conditions . found a kinetic equation for calcium bisulfite oxidation which is of zero order in oxygen and three halves in . HSO 3. -. ions. The reaction has then been carried out in the presence of other catalysts, namely manganese . and ferrous ions, into a laboratory-scale well-mixed reactor. Experimental results have shown that, when . catalyst concentration increases, theree different reaction regimes (slow kinetic, slow diffusional and fast . reaction regime) can be detected. This paper proposes a numerical model to describe the interaction . between oxygen absorption and oxidation reaction, in which an in-parallel kinetic equation is used to . describe the slow kinetic reaction results, according to which the overall reaction rate can be calculated as . the sum of the uncatalyzed and catalyzed reaction rate, also taking into account that the oxidation kinetics . are zero order in oxygen. Moreover, this paper shows how the model is capable of describing the . experimental results obtained by this research group, as far as the manganese catalyzed bisulfite . oxidation rate is concerned. \""
"Limestone-Gypsum Flue Gas Desulfurization Process: Modeling of Catalyzed Bisulfite Oxidation"
MUSMARRA, Dino;
2013
Abstract
"\"The most common commercial process for SO 2 removal from flue gas is the wet limestone flue gas . desulfurization process, in which sulfite oxidation represents an important limiting phenomenon. A detailed . knowledge of the oxidation process is important to determine the dewatering properties of the sludge . produced, and a good understanding of the oxidation kinetics is also useful for the development of . computer codes aimed at modeling the whole flue gas desulfurization process. Sulfite oxidation was . studied both in homogeneous conditions, obtained by contacting a sulfite solution with an oxygen . saturated solution, and in heterogeneous conditions, obtained by contacting a sulfurous solution with an . oxygen containing gas phase. As far as the bisulfite oxidation reaction in heterogeneous conditions is . concerned, a previous experimental study by the same research group in absolute catalyst free conditions . found a kinetic equation for calcium bisulfite oxidation which is of zero order in oxygen and three halves in . HSO 3. -. ions. The reaction has then been carried out in the presence of other catalysts, namely manganese . and ferrous ions, into a laboratory-scale well-mixed reactor. Experimental results have shown that, when . catalyst concentration increases, theree different reaction regimes (slow kinetic, slow diffusional and fast . reaction regime) can be detected. This paper proposes a numerical model to describe the interaction . between oxygen absorption and oxidation reaction, in which an in-parallel kinetic equation is used to . describe the slow kinetic reaction results, according to which the overall reaction rate can be calculated as . the sum of the uncatalyzed and catalyzed reaction rate, also taking into account that the oxidation kinetics . are zero order in oxygen. Moreover, this paper shows how the model is capable of describing the . experimental results obtained by this research group, as far as the manganese catalyzed bisulfite . oxidation rate is concerned. \""I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
