Hydrogen-rich syngas production and carbon dioxide formation using aqueous urea solution in biogas steam reforming by thermodynamic analysis |
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| Affiliation: | 1. Environment and Energy Issue Department, Automotive Research and Testing Center, Taiwan, ROC;2. Department of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Taiwan, ROC;1. Chemical Engineering Department, Feng Chia University, 100 Wenhua Road, Seatun, 40724, Taichung, Taiwan;2. Green Energy Development Center, Feng Chia University, 100 Wenhua Road, Seatun, 40724, Taichung, Taiwan;1. Institute CNR-ITAE, Via Salita S. Lucia sopra Contesse n. 5, S. Lucia, 98126 Messina, Italy;2. Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica “G. Natta”, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;3. Università degli Studi “Mediterranea” di Reggio Calabria, Dipartimento di Ingegneria Civile, dell''Energia, dell''Ambiente e dei Materiali, Salita Melissari, 89124 Reggio Calabria, Italy;1. School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea;2. CE-CERT, University of California, Riverside CA 92507, USA;1. Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran;2. Faculty of Chemical Engineering, Petroleum and Gas, University of Shiraz, Shiraz, Iran |
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| Abstract: | Biogas is a renewable biofuel that contains a lot of CH4 and CO2. Biogas can be used to produce heat and electric power while reducing CH4, one of greenhouse gas emissions. As a result, it has been getting increasing academic attention. There are some application ways of biogas; biogas can produce hydrogen to feed a fuel cell by reforming process. Urea is also a hydrogen carrier and could produce hydrogen by steam reforming. This study then employes steam reforming of biogas and compares hydrogen-rich syngas production and carbon dioxide with various methane concentrations using steam and aqueous urea solution (AUS) by Thermodynamic analysis. The results show that the utilization of AUS as a replacement for steam enriches the production of H2 and CO and has a slight CO2 rise compared with pure biogas steam reforming at a temperature higher than 800 °C. However, CO2 formation is less than the initial CO2 in biogas. At the reaction temperature of 700 °C, carbon formation does not occur in the reforming process for steam/biogas ratios higher than 2. These conditions led to the highest H2, CO production, and reforming efficiency (about 125%). The results can be used as operation data for systems that combine biogas reforming and applied to solid oxide fuel cell (SOFC), which usually operates between 700 °C to 900 °C to generate electric power in the future. |
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| Keywords: | Aqueous urea solution Biogas Steam reforming Hydrogen-rich syngas Carbon dioxide formation |
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