Comparative study of fuel gas production for SOFC from steam and supercritical-water reforming of bioethanol

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• 作者：Suwimol Wongsakulphasatch^a ; ^{suwimol.w@su.ac.th} ; ^{suwimol1331@yahoo.com} ; Worapon Kiatkittipong^a ; Suttichai Assabumrungrat^b
• 关键词：Steam reforming ; Supercritical-water reforming ; Bioethanol ; Gibbs free energy minimization
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：10 May, 2013
• 年：2013
• 卷：38
• 期：14
• 页码：5555-5562
• 全文大小：928 K

文摘

Theoretical study of fuel gas (H₂?+?CO) production for SOFC from bioethanol was carried out to compare performances between two reforming technologies, including steam reforming (SR) and supercritical-water reforming (SCWR). It demonstrates that the fuel gas productions are comparable among the two reforming systems; however, SCWR requires the operation at much higher temperature and pressure than SR. The maximum hydrogen yield can be obtained at 850?K, atmospheric pressure, ethanol to water molar feed ratio of 1:20 for SR system and at 1300?K, 22.1?MPa, and ethanol to water feed ratio of 1:20 for SCWR. The use of a distillation column to purify the bioethanol feed was proven to improve the fuel conversion efficiency of both systems. The analysis reveals that SCWR is a promising system for fuel production for SOFC when a gas turbine is incorporated to the system for energy recovery. Further, it is not necessary to distil bioethanol to obtain too high ethanol recovery (i.e. >90 % ) as higher energy consumption at the distillation column could lead to lower overall thermal efficiency.