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Energy efficiency limits for a recuperative bayonet sulfuric acid decomposition reactor for sulfur cycle thermochemical hydrogen production / Maximilian B. Gorensek in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7232–7245 Titre : Energy efficiency limits for a recuperative bayonet sulfuric acid decomposition reactor for sulfur cycle thermochemical hydrogen production Type de document : texte imprimé Auteurs : Maximilian B. Gorensek, Auteur ; Thomas B. Edwards, Auteur Année de publication : 2009 Article en page(s) : pp. 7232–7245 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Recuperative  bayonet  reactor  Sulfur-based  thermochemical  hydrogen  cycle  Energy  efficiency Résumé : A recuperative bayonet reactor design for the high-temperature sulfuric acid decomposition step in sulfur-based thermochemical hydrogen cycles was evaluated using pinch analysis in conjunction with statistical methods. The objective was to establish the minimum energy requirement. Taking hydrogen production via alkaline electrolysis with nuclear power as the benchmark, the acid decomposition step can consume no more than 450 kJ/(mol of SO2) for sulfur cycles to be competitive. The lowest value of the minimum heating target, 320.9 kJ/(mol of SO2), was found at the highest pressure (90 bar) and peak process temperature (900 °C) considered, and at a feed concentration of 42.5 mol % H2SO4. This should be low enough for a practical water-splitting process, even including the additional energy required to concentrate the acid feed. Lower temperatures consistently gave higher minimum heating targets. The lowest peak process temperature that could meet the benchmark of 450 kJ/(mol of SO2) was 750 °C. If the decomposition reactor were to be heated indirectly by an advanced gas-cooled reactor heat source (50 °C temperature difference between the primary and secondary coolants, 25 °C minimum temperature difference between the secondary coolant and the process), then sulfur cycles using this concept could be competitive with alkaline electrolysis provided that the primary heat source temperature is at least 825 °C. The bayonet design will not be practical if the (primary heat source) reactor outlet temperature is below 825 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900310r [article] Energy efficiency limits for a recuperative bayonet sulfuric acid decomposition reactor for sulfur cycle thermochemical hydrogen production [texte imprimé] / Maximilian B. Gorensek, Auteur ; Thomas B. Edwards, Auteur . - 2009 . - pp. 7232–7245. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7232–7245 Mots-clés : Recuperative  bayonet  reactor  Sulfur-based  thermochemical  hydrogen  cycle  Energy  efficiency Résumé : A recuperative bayonet reactor design for the high-temperature sulfuric acid decomposition step in sulfur-based thermochemical hydrogen cycles was evaluated using pinch analysis in conjunction with statistical methods. The objective was to establish the minimum energy requirement. Taking hydrogen production via alkaline electrolysis with nuclear power as the benchmark, the acid decomposition step can consume no more than 450 kJ/(mol of SO2) for sulfur cycles to be competitive. The lowest value of the minimum heating target, 320.9 kJ/(mol of SO2), was found at the highest pressure (90 bar) and peak process temperature (900 °C) considered, and at a feed concentration of 42.5 mol % H2SO4. This should be low enough for a practical water-splitting process, even including the additional energy required to concentrate the acid feed. Lower temperatures consistently gave higher minimum heating targets. The lowest peak process temperature that could meet the benchmark of 450 kJ/(mol of SO2) was 750 °C. If the decomposition reactor were to be heated indirectly by an advanced gas-cooled reactor heat source (50 °C temperature difference between the primary and secondary coolants, 25 °C minimum temperature difference between the secondary coolant and the process), then sulfur cycles using this concept could be competitive with alkaline electrolysis provided that the primary heat source temperature is at least 825 °C. The bayonet design will not be practical if the (primary heat source) reactor outlet temperature is below 825 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900310r