| 초록 |
A High Temperature process for the desulfurization of coal-derived gas constitutes an important step in the development of integrated gasification-combined cycle(IGCC) and MCFC advanced power generation processes. Both processes have the potential for reduction of pollutant emissions and high electrical generation efficiency compared to conventional coal-fired power plants. Traditional desulfurization processes using wet scrubbing are impractical at the temperatures and pressures of interst(750-1000K and 1000-2000kPa). A High Temperature desulfurization process based upon the reaction of an appropriate mixed-metal oxide with H2S to form the corresponding metal sulfide is under development. In this modeling study, zinc titanate(Zn2TiO4) and zinc ferrite(ZnFe2O4) is considered as prime candidate sorbents to remove H2S component in coal-derived gas. This sorbents combine favorable thermodynamic properties with high theoretical sulfur capacity and rapid reactivity. The performance of both zinc titanate and zinc ferrite sorbents is tested in a fixed-bed reactor using simulated coal gas. H2S concentrations in the exit gas were measured as a function of time and the runs were terminated soon after H2S breakthrough, with effluent H2S concentrations in the range of 10-1000ppmv.
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