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Adhesion, abrasion, and desulfurization characteristics of rapidly hydrated sorbent with cheap and easily obtained adhesive carrier particles / Yuan Li in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13833-13838 Titre : Adhesion, abrasion, and desulfurization characteristics of rapidly hydrated sorbent with cheap and easily obtained adhesive carrier particles Type de document : texte imprimé Auteurs : Yuan Li, Auteur ; Changfu You, Auteur Année de publication : 2012 Article en page(s) : pp. 13833-13838 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adhesive  Desulfurization  Abrasion  Adhesion Résumé : Adhesive carrier particles have important technical and economic influence on circulating fluidized bed flue gas desulfurization (CFB-FGD) systems that use rapidly hydrated sorbent. Several cheap and easily obtained materials with rough surfaces and porous structures were used as adhesive carrier particles to prepare rapidly hydrated sorbent: the fly ash from the first electrical field in the electrostatic precipitator (ESP) of a circulating fluidized bed (CFB) boiler, the fly ash from a chain boiler, and river sand. Scanning electron microscopy (SEM), particle size distribution (PSD) analysis, surface and pore analysis, abrasion tests, and thermal gravimetric analysis (TGA) tests were used to examine the influence of the adhesive carrier particles' surface and pore characteristics on the adhesion, abrasion, and desulfurization characteristics of the rapidly hydrated sorbent. Experimental results showed that the CFBB ESP ash, chain boiler ash, and river sand all improved the abrasion and desulfurization characteristics of the rapidly hydrated sorbent compared to the coal fly ash. Specifically, the abrasion ratios of the experimental sorbents were all less than 25% compared to 45% for the coal fly ash sorbent, while the desulfurization abilities of the three experimental sorbents were more than 830 mg SO2/g lime compared to 725 mg SO2/g lime for the coal fly ash sorbent. The river sand sorbent had the greatest desulfurization ability and the lowest abrasion ratio, and it possesses the best industrial application potential of all the tested materials. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508207 [article] Adhesion, abrasion, and desulfurization characteristics of rapidly hydrated sorbent with cheap and easily obtained adhesive carrier particles [texte imprimé] / Yuan Li, Auteur ; Changfu You, Auteur . - 2012 . - pp. 13833-13838. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13833-13838 Mots-clés : Adhesive  Desulfurization  Abrasion  Adhesion Résumé : Adhesive carrier particles have important technical and economic influence on circulating fluidized bed flue gas desulfurization (CFB-FGD) systems that use rapidly hydrated sorbent. Several cheap and easily obtained materials with rough surfaces and porous structures were used as adhesive carrier particles to prepare rapidly hydrated sorbent: the fly ash from the first electrical field in the electrostatic precipitator (ESP) of a circulating fluidized bed (CFB) boiler, the fly ash from a chain boiler, and river sand. Scanning electron microscopy (SEM), particle size distribution (PSD) analysis, surface and pore analysis, abrasion tests, and thermal gravimetric analysis (TGA) tests were used to examine the influence of the adhesive carrier particles' surface and pore characteristics on the adhesion, abrasion, and desulfurization characteristics of the rapidly hydrated sorbent. Experimental results showed that the CFBB ESP ash, chain boiler ash, and river sand all improved the abrasion and desulfurization characteristics of the rapidly hydrated sorbent compared to the coal fly ash. Specifically, the abrasion ratios of the experimental sorbents were all less than 25% compared to 45% for the coal fly ash sorbent, while the desulfurization abilities of the three experimental sorbents were more than 830 mg SO2/g lime compared to 725 mg SO2/g lime for the coal fly ash sorbent. The river sand sorbent had the greatest desulfurization ability and the lowest abrasion ratio, and it possesses the best industrial application potential of all the tested materials. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508207

Effect of internal structure on flue gas mesulfurization with rapidly hydrated sorbent in a circulating fluidized bed at moderate temperatures / Jie Zhang in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11464–11470 Titre : Effect of internal structure on flue gas mesulfurization with rapidly hydrated sorbent in a circulating fluidized bed at moderate temperatures Type de document : texte imprimé Auteurs : Jie Zhang, Auteur ; Changfu You, Auteur ; Changhe Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 11464–11470 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas  desulfurization  Sorbent Résumé : A moderate-temperature desulfurization process at 600−800 °C was studied in a pilot-scale circulating fluidized bed flue gas desulfurization (CFB-FGD) experimental facility with the addition of the internal structure. The rapidly hydrated sorbent and the desulfurization products were analyzed to clarify the influence mechanism of the internal structure on the moderate-temperature desulfurization process. The results show that the desulfurization efficiency with the internal structure at 600−800 °C was 74−93% for the calcium to sulfur (Ca/S) molar ratio of 2.0, which was higher than the desulfurization efficiency without the internal structure of 67−83%. As for the calcium-containing compositions, the desulfurization products included about 70% cyclone recirculation sample and about 30% bag filter sample. The cyclone recirculation sample was mainly composed of CaSO4 and CaO. The bag filter sample not only contained high contents of CaSO4 and CaO but also contained a considerable amount of CaCO3 and even some unreacted Ca(OH)2. With the addition of the internal structure, the calcium conversion rate of the cyclone recirculation sample greatly increased from 42.8 to 47.4% while that of the bag filter sample just increased from 29.4 to 30.7%. It demonstrated that the main contributor for the improved desulfurization efficiency was the cyclone recirculation sample due to the improved solids concentration distribution and the enhanced gas−solid contact efficiency. The calcium conversion rate for the bag filter sample depended on the solids concentration distribution as well as the particle residence time in the moderate temperature range, which indicated that prolonging the particle residence time for the fresh sorbent and the fall off calcium-containing particles was important to further improve the desulfurization performance. These results provided good guidance for realizing high desulfurization efficiency and low flow resistance in dry FGD processes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100988r [article] Effect of internal structure on flue gas mesulfurization with rapidly hydrated sorbent in a circulating fluidized bed at moderate temperatures [texte imprimé] / Jie Zhang, Auteur ; Changfu You, Auteur ; Changhe Chen, Auteur . - 2011 . - pp. 11464–11470. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11464–11470 Mots-clés : Gas  desulfurization  Sorbent Résumé : A moderate-temperature desulfurization process at 600−800 °C was studied in a pilot-scale circulating fluidized bed flue gas desulfurization (CFB-FGD) experimental facility with the addition of the internal structure. The rapidly hydrated sorbent and the desulfurization products were analyzed to clarify the influence mechanism of the internal structure on the moderate-temperature desulfurization process. The results show that the desulfurization efficiency with the internal structure at 600−800 °C was 74−93% for the calcium to sulfur (Ca/S) molar ratio of 2.0, which was higher than the desulfurization efficiency without the internal structure of 67−83%. As for the calcium-containing compositions, the desulfurization products included about 70% cyclone recirculation sample and about 30% bag filter sample. The cyclone recirculation sample was mainly composed of CaSO4 and CaO. The bag filter sample not only contained high contents of CaSO4 and CaO but also contained a considerable amount of CaCO3 and even some unreacted Ca(OH)2. With the addition of the internal structure, the calcium conversion rate of the cyclone recirculation sample greatly increased from 42.8 to 47.4% while that of the bag filter sample just increased from 29.4 to 30.7%. It demonstrated that the main contributor for the improved desulfurization efficiency was the cyclone recirculation sample due to the improved solids concentration distribution and the enhanced gas−solid contact efficiency. The calcium conversion rate for the bag filter sample depended on the solids concentration distribution as well as the particle residence time in the moderate temperature range, which indicated that prolonging the particle residence time for the fresh sorbent and the fall off calcium-containing particles was important to further improve the desulfurization performance. These results provided good guidance for realizing high desulfurization efficiency and low flow resistance in dry FGD processes. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100988r