Prevention of bed agglomeration with iron oxide during fluidized bed incineration of refuse-derived fuels |
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Authors: | Mi-Ran Kim and Jea-Keun Lee |
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Affiliation: | (1) Department of Civil and Environmental Engineering, University of Trento, Via Mesiano 77, 38050 Trento, Italy;(2) Department of Energy Production and Use, Politehnica University of Bucharest, Splaiul Independentei 313, 060042 Bucuresti, Romania |
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Abstract: | The present study was performed to evaluate the effect of iron oxide addition on the prevention of bed agglomeration during
the fluidized bed incineration of refuse-derived fuels (RDFs) having different alkali contents. To investigate the extent
of bed agglomeration as a function of the Fe2O3/(K2O+Na2O) molar ratio, a simulation was performed by using a thermodynamic equilibrium model. Based on this simulation, potassium
(K) component exhibited a much higher affinity for iron (Fe) component than for silicon (Si) component, and the extent of
agglomeration was remarkably reduced. Therefore, a small amount of iron oxide added to the bed effectively reduced the extent
of bed agglomeration in the fluidized bed incineration process. Furthermore, the extent of agglomeration decreased as the
molar ratio of Fe2O3/(K2O+Na2O) increased until unity was attained. In excess Fe2O3, no potassium silicate melts existed in the products, while the amount of sodium silicate melts remained constant. |
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