High-Temperature Removal of Hydrogen Sulfide over Mn2O3/γ-Al2O3 Sorbent

• Main Authors: Lung-Kai Chuang, 莊隆凱
• Other Authors: Hsin Chu
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/728p7u

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 90 === Most large-scale existing commercial coal-based IGCC plants use wet scrubbers to remove H2S, but there are too much heat losses in the process. Therefore, it is necessary to find out a feasible dry desulfurization process operating under high temperature to raise the thermal efficiency and reduce the cost of the IGCC. Desulfurization of hot syngas using homemade Mn2O3/γ-Al2O3 sorbent in a fixed bed reactor was conducted in this study. The explanation of results can be divided into five major parts. 1.The Zinc based sorbent and Copper based sorbent have the highest sorbent utilization among all the metal oxide sorbents supported on the γ-Al2O3 that we have tested. 2.The Manganese based sorbent supported on γ-Al2O3 has higher sorbent utilization than that supported on SiO2 and the Manganese based sorbent supported on TiO2 has the worst performance. 3.The effects of operating factors, such as inlet temperature, space velocity, CO inlet concentration, H2 inlet concentration and H2S inlet concentration on the absorption of H2S were performed. The results show that the sorbent utilization increases with the inlet temperature and CO concentration, and decreases as the H2 concentration increases. H2S concentration and space velocity, however, don’t change the sorbent utilization significantly. 4.The activity of the sorbent decreases significantly while sulfuration is operating after regeneration. Some instruments were employed to determine the characteristics of the sorbents after regeneration, such as BET, EDX, XPS, and XRD. From the results of pore analyses, we infer that sintering happens during regeneration. EDX spectra show that sulfur still exists in the sorbent after regeneration and we find that the forms of sulfur existed in the sorbent are sulfate and sulfite from XPS spectra. The peaks relating to Manganese disappear and only γ-Al2O3 can be identified in the XRD spectra of regenerated sorbents. 5.In the operating range of this study, we can find that Deactivation model typeⅠ is the most suitable model to fit the experimental data. We obtain the activity energy Ea=86.9 KJ/mole.