Abstract
A mathematical model of a transport reactor has been developed and implemented with the software Athena Visual Studio. The one-dimensional, steady state model takes into account kinetics and hydrodynamic effects. The reactor has been divided into three zones: the acceleration zone, the fully developed zone and the exit zone. Empirical correlations are used to describe the different regions, with particular reference to the axial voidage profile. The unreacted shrinking core model with variable effective diffusivity is applied to determine the sorbent conversion and the reaction rate. Two different sorbents were investigated: zinc titanate, considered as one of the most promising mixed metal oxide and calcium oxide as natural material. The differences, in terms of operating temperature and desulfurization efficiency, are discussed. Finally, to estimate the advantages of the described alternatives, they have been included in an Integrated Gasification Combined Cycle (IGCC) and simulated by the software package Thermoflex. The results show an interesting enhancement of the efficiency up to 3% accompanied by a simpler system configuration.
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