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Comparing the performance of recirculating cyclones applied to the dry scrubbing of gaseous HCl with hydrated lime / Vania Chibante in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 1029–1035 Titre : Comparing the performance of recirculating cyclones applied to the dry scrubbing of gaseous HCl with hydrated lime Type de document : texte imprimé Auteurs : Vania Chibante, Auteur ; Ana M. Fonseca, Auteur ; Romualdo L. R. Salcedo, Auteur Année de publication : 2009 Article en page(s) : p. 1029–1035 Note générale : chimical engineering Langues : Anglais (eng) Mots-clés : Recirculating  cyclone  systems Résumé : Recirculating cyclone systems, combining a numerically optimized reverse flow gas cyclone (RS_VHE geometry) with a straight-through cyclone concentrator, were employed as reaction chambers for the dry scrubbing of gaseous hydrogen chloride with solid hydrated lime particles. The performance of this technology was tested at laboratory scale with two differently sized RS_VHE cyclones (0.020 and 0.026 m internal diameter) coupled to the same recirculator of 0.020 m internal diameter. The experimental conditions were the following: reaction temperature ≈ 326 K, gas flow rate ≈ 2.9 × 10−4 m3·s−1 at STP, and relative humidity of the gas ≈ 8.5%. The experimental variables were the solids feed rate [(1.0−9.2) × 10−7 kg·s−1] and HCl concentration in the inlet gas [(0.35−2.8) × 10−2 mol·m−3], giving different values for the ratio between the amount of fresh hydrated lime and HCl feed at the inlet of the recirculating cyclone systems (R) and that corresponding to the stoichiometric quantity (SR). The acid removal efficiencies ranged from 10 to 96%, and the best performances were obtained for high values of the ratio R/SR. Increasing the cyclone diameter while maintaining cyclone geometry improved the performance of the acid gas removal as well as the solid reactant conversion, but the average particle collection efficiency was lowered from (98.0 ± 0.7)% to (89.3 ± 1.7)%. [article] Comparing the performance of recirculating cyclones applied to the dry scrubbing of gaseous HCl with hydrated lime [texte imprimé] / Vania Chibante, Auteur ; Ana M. Fonseca, Auteur ; Romualdo L. R. Salcedo, Auteur . - 2009 . - p. 1029–1035. chimical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 1029–1035 Mots-clés : Recirculating  cyclone  systems Résumé : Recirculating cyclone systems, combining a numerically optimized reverse flow gas cyclone (RS_VHE geometry) with a straight-through cyclone concentrator, were employed as reaction chambers for the dry scrubbing of gaseous hydrogen chloride with solid hydrated lime particles. The performance of this technology was tested at laboratory scale with two differently sized RS_VHE cyclones (0.020 and 0.026 m internal diameter) coupled to the same recirculator of 0.020 m internal diameter. The experimental conditions were the following: reaction temperature ≈ 326 K, gas flow rate ≈ 2.9 × 10−4 m3·s−1 at STP, and relative humidity of the gas ≈ 8.5%. The experimental variables were the solids feed rate [(1.0−9.2) × 10−7 kg·s−1] and HCl concentration in the inlet gas [(0.35−2.8) × 10−2 mol·m−3], giving different values for the ratio between the amount of fresh hydrated lime and HCl feed at the inlet of the recirculating cyclone systems (R) and that corresponding to the stoichiometric quantity (SR). The acid removal efficiencies ranged from 10 to 96%, and the best performances were obtained for high values of the ratio R/SR. Increasing the cyclone diameter while maintaining cyclone geometry improved the performance of the acid gas removal as well as the solid reactant conversion, but the average particle collection efficiency was lowered from (98.0 ± 0.7)% to (89.3 ± 1.7)%.