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Received April 30, 2002
Accepted September 26, 2002
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Effect of Cl/S Molar Ratio on Theoretical Partitioning of Heavy Metals under Waste Combustion Conditions
Department of Environmental Engineering, Dongseo University, Busan 617-716, Korea 1Department of Environmental Engineering, Silla University, Busan 617-76, Korea 2Department of Environmental Engineering, Korea Institute of Machinery & Materials, Daejeon 305-343, Korea 3Department of Environmental Engineering, Pukyong National University, Busan 608-737, Korea
leejk@pknu.ac.kr
Korean Journal of Chemical Engineering, November 2002, 19(6), 1097-1105(9), 10.1007/BF02707239
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Abstract
A simulation calculation was carried out to predict the behavior of heavy metals during waste incineration according to the variation of chlorine content by using a thermodynamic equilibrium model. To predict the behavior of heavy metals in incineration of wastes, chlorine content in wastes was changed up to 3.00 on a Cl/S molar ratio basis. Then the partitioning characteristics of heavy metals with Cl/Metal molar ratio were investigated as solid, liquid, and gas phases of metals. For analysis of emission characteristics, incineration temperature, chlorine content and air-fuel ratio (λT) were chosen as major operating parameters. It was found that the distribution characteristics of heavy metals were not significantly affected by air-fuel ratio, but evaporation rate of heavy metals increased with operating temperature. Most of the heavy metals remained in solid phase of metal oxides, such as CdO, CrO3, CrO2, CuO and ZnO, except for lead which existed as PbSO4 in the given operating conditions (i.e., Tb=800 ℃, λT=1.3, and Cl/S=0). It was_x000D_
found that most of the heavy metals in solid phase changed to gaseous Cl compounds, which have a high volatility with regard to increasing the Cl/S molar ratio under the same conditions. However, Cr compounds were almost not affected as chlorine level increased.
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References
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Lee KH, "Combustion Characteristics of Sewage Sludge and Reduction of Pollutants in Fluidized Bed Incinerators," Ph.D. dissertation, National Fisheries University of Pusan, Korea (1992)
Lee MG, Yi G, Ahn BJ, Roddick F, Korean J. Chem. Eng., 17(3), 325 (2000)
Lyngfelt A, Leckner B, Fuel, 72, 1553 (1993)
Manzoori AR, Agarwal PK, Fuel, 72, 7 (1993)
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Zhao J, Grace JR, Lim CJ, Breton CMH, Legros R, Fuel, 73(10), 1650 (1994)
