Documents disponibles écrits par cet auteur

Effect of SO2 on the reaction of calcium hydroxide with CO2 at low temperatures / Liu, Chiung-Fang in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9052–9057 Titre : Effect of SO2 on the reaction of calcium hydroxide with CO2 at low temperatures Type de document : texte imprimé Auteurs : Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur ; Tsai-Bang Huang, Auteur Année de publication : 2010 Article en page(s) : pp. 9052–9057 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydroxide  Low  temperature  CO2 Résumé : The flue gas generated from a coal-fired power plant contains CO2 and SO2. The effect of SO2 concentration (≤1000 ppm) on the reaction of CO2 with Ca(OH)2 was studied using a differential fixed-bed reactor under the low-temperature and humid conditions similar to those in the bag filters of a dry or semidry flue gas desulfurization (FGD) system. When both CO2 and SO2 were present, they reacted with Ca(OH)2 simultaneously to form calcium carbonate and sulfite, but part of the carbonate formed reacted further with SO2 to form sulfite. Ca(OH)2 ceased to react due to the formation of an impervious product layer. The fraction of carbonate increased significantly with decreasing SO2 concentration in the range below 500 ppm SO2, but the fraction of sulfite decreased little except in the range below 100 ppm SO2 or at a relative humidity (RH) above 70%. Both fractions of carbonate and sulfite increased markedly with increasing relative humidity and slightly with increasing temperature, but they were little affected by the CO2 concentration and the presence of O2. At SO2 concentrations ≤100 ppm, conversions of Ca(OH)2 to carbonate in the range comparable to or higher than the typical conversions of Ca(OH)2 for SO2 removal in a dry or semidry FGD process could be achieved. The results of this work are useful for evaluating the feasibility of using solid wastes containing CaO and/or Ca(OH)2 to capture CO2 from flue gas at low temperatures. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100924z [article] Effect of SO2 on the reaction of calcium hydroxide with CO2 at low temperatures [texte imprimé] / Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur ; Tsai-Bang Huang, Auteur . - 2010 . - pp. 9052–9057. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9052–9057 Mots-clés : Hydroxide  Low  temperature  CO2 Résumé : The flue gas generated from a coal-fired power plant contains CO2 and SO2. The effect of SO2 concentration (≤1000 ppm) on the reaction of CO2 with Ca(OH)2 was studied using a differential fixed-bed reactor under the low-temperature and humid conditions similar to those in the bag filters of a dry or semidry flue gas desulfurization (FGD) system. When both CO2 and SO2 were present, they reacted with Ca(OH)2 simultaneously to form calcium carbonate and sulfite, but part of the carbonate formed reacted further with SO2 to form sulfite. Ca(OH)2 ceased to react due to the formation of an impervious product layer. The fraction of carbonate increased significantly with decreasing SO2 concentration in the range below 500 ppm SO2, but the fraction of sulfite decreased little except in the range below 100 ppm SO2 or at a relative humidity (RH) above 70%. Both fractions of carbonate and sulfite increased markedly with increasing relative humidity and slightly with increasing temperature, but they were little affected by the CO2 concentration and the presence of O2. At SO2 concentrations ≤100 ppm, conversions of Ca(OH)2 to carbonate in the range comparable to or higher than the typical conversions of Ca(OH)2 for SO2 removal in a dry or semidry FGD process could be achieved. The results of this work are useful for evaluating the feasibility of using solid wastes containing CaO and/or Ca(OH)2 to capture CO2 from flue gas at low temperatures. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100924z

Kinetics of the reaction of hydrated lime with SO2 at low temperatures / Liu, Chiung-Fang ; Shih, Shin-Min in Industrial & engineering chemistry research, Vol. 47 n°24 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9878–9881 Titre : Kinetics of the reaction of hydrated lime with SO2 at low temperatures : effects of the presence of CO2, O2, and NOx Type de document : texte imprimé Auteurs : Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur Année de publication : 2009 Article en page(s) : p. 9878–9881 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : sulfation--hydrated  lime Résumé : The effects of the presence of CO2, O2, and NOx in the flue gas on the kinetics of the sulfation of hydrated lime at low temperatures were studied using a differential fixed-bed reactor. When O2 and NOx were not present together the reaction kinetics was about the same as that under gas mixtures containing SO2, H2O, and N2 only. When both O2 and NOx were present, sulfation of hydrated lime was greatly enhanced, forming a large amount of calcium sulfate in addition to calcium sulfite. Sulfation of hydrated lime was well described by the surface coverage model, despite the gas-phase conditions being different. Relative humidity is the major factor affecting the reaction, and its effect was more marked when both O2 and NOx were present. The kinetic model equations obtained in this work can be used to describe the sulfation of hydrated lime in the low-temperature dry and semidry flue gas desulfurization processes with or without an upstream NOx removal unit. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801105s [article] Kinetics of the reaction of hydrated lime with SO2 at low temperatures : effects of the presence of CO2, O2, and NOx [texte imprimé] / Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur . - 2009 . - p. 9878–9881. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p. 9878–9881 Mots-clés : sulfation--hydrated  lime Résumé : The effects of the presence of CO2, O2, and NOx in the flue gas on the kinetics of the sulfation of hydrated lime at low temperatures were studied using a differential fixed-bed reactor. When O2 and NOx were not present together the reaction kinetics was about the same as that under gas mixtures containing SO2, H2O, and N2 only. When both O2 and NOx were present, sulfation of hydrated lime was greatly enhanced, forming a large amount of calcium sulfate in addition to calcium sulfite. Sulfation of hydrated lime was well described by the surface coverage model, despite the gas-phase conditions being different. Relative humidity is the major factor affecting the reaction, and its effect was more marked when both O2 and NOx were present. The kinetic model equations obtained in this work can be used to describe the sulfation of hydrated lime in the low-temperature dry and semidry flue gas desulfurization processes with or without an upstream NOx removal unit. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801105s

Kinetics of the reaction of iron blast furnace slag/hydrated lime sorbents with SO2 at low temperatures / Liu, Chiung-Fang in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8335–8340 Titre : Kinetics of the reaction of iron blast furnace slag/hydrated lime sorbents with SO2 at low temperatures : effects of the presence of CO2, O2, and NOx Type de document : texte imprimé Auteurs : Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur Année de publication : 2010 Article en page(s) : pp. 8335–8340 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : CO2  O2  NOx  Flue  gas  Differential  fixed-bed  reactor Résumé : The effects of the presence of CO2, O2, and NOx in the flue gas on the kinetics of the sulfation of blast furnace slag/hydrated lime sorbents at low temperatures were studied using a differential fixed-bed reactor. When O2 and NOx were not present simultaneously, the reaction kinetics was about the same as that under the gas mixtures containing SO2, H2O, and N2 only, being affected mainly by the relative humidity. The sulfation of sorbents can be described by the surface coverage model and the model equations derived for the latter case. When both O2 and NOx were present, the sulfation of sorbents was greatly enhanced, forming a great amount of sulfate in addition to sulfite. The surface coverage model is still valid in this case, but the model equations obtained show a more marked effect of relative humidity and negligible effects of SO2 concentration and temperature on the reaction. The effect of sorbent composition on the reaction kinetics was entirely represented by the effects of the initial specific surface area (Sg0) and the Ca molar content (M−1) of sorbent. The initial conversion rate of sorbent increased linearly with increasing Sg0, and the ultimate conversion increased linearly with increasing Sg0M−1. The model equations obtained in this work are applicable to describe the kinetics of the sulfation of the sorbents in the low-temperature dry and semidry flue gas desulfurization processes either with an upstream NOx removal unit or without. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900379c [article] Kinetics of the reaction of iron blast furnace slag/hydrated lime sorbents with SO2 at low temperatures : effects of the presence of CO2, O2, and NOx [texte imprimé] / Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur . - 2010 . - pp. 8335–8340. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8335–8340 Mots-clés : CO2  O2  NOx  Flue  gas  Differential  fixed-bed  reactor Résumé : The effects of the presence of CO2, O2, and NOx in the flue gas on the kinetics of the sulfation of blast furnace slag/hydrated lime sorbents at low temperatures were studied using a differential fixed-bed reactor. When O2 and NOx were not present simultaneously, the reaction kinetics was about the same as that under the gas mixtures containing SO2, H2O, and N2 only, being affected mainly by the relative humidity. The sulfation of sorbents can be described by the surface coverage model and the model equations derived for the latter case. When both O2 and NOx were present, the sulfation of sorbents was greatly enhanced, forming a great amount of sulfate in addition to sulfite. The surface coverage model is still valid in this case, but the model equations obtained show a more marked effect of relative humidity and negligible effects of SO2 concentration and temperature on the reaction. The effect of sorbent composition on the reaction kinetics was entirely represented by the effects of the initial specific surface area (Sg0) and the Ca molar content (M−1) of sorbent. The initial conversion rate of sorbent increased linearly with increasing Sg0, and the ultimate conversion increased linearly with increasing Sg0M−1. The model equations obtained in this work are applicable to describe the kinetics of the sulfation of the sorbents in the low-temperature dry and semidry flue gas desulfurization processes either with an upstream NOx removal unit or without. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900379c

Reactivities of NaOH enhanced iron blast furnace slag/hydrated lime sorbents toward SO2 at low temperatures / Liu, Chiung-Fang in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 515–519 Titre : Reactivities of NaOH enhanced iron blast furnace slag/hydrated lime sorbents toward SO2 at low temperatures : effects of the Presence of CO2, O2, and NOx Type de document : texte imprimé Auteurs : Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur ; Yang, Jung-Hsin, Auteur Année de publication : 2010 Article en page(s) : pp 515–519 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Reactivities  NaOH  Hydrated  lime  sorbents. Résumé : The effects of the addition of NaOH on the reactivities toward SO2 of iron blast furnace slag/hydrated lime (BFS/HL) sorbents were studied without and with the presence of flue gas components, CO2, O2, and NOx, under the conditions prevailing in the bag filters of dry and semidry flue gas desulfurization processes. The reactivities of sorbents were markedly enhanced by the addition of NaOH when CO2, O2, and NOx were not present in the gas mixture. The enhancement effect mainly resulted from the deliquescent property of NaOH. With the presence of CO2, O2, and NOx at their typical concentrations in the flue gas, the sorbent reactivity was greatly increased due to the oxidation of bisulfite and sulfite ions to sulfate ions as well as the formation of deliquescent salts, calcium nitrite and nitrate, being enhanced by the presence of NO2 during the sulfation of a BFS/HL sorbent. The addition of NaOH in this case promoted the formation of sulfates but became less important in raising the sorbent reactivities for sorbents except BFS. Without the presence of CO2/O2/NOx, the BFS/HL sorbents with ratios ≤70/30 had higher reactivities than HL, but with the presence of CO2/O2/NOx, HL had the highest value of SO2 capture among the BFS/HL and BFS/HL/NaOH sorbents tested. Placing the SO2 removal unit before the NOx removal unit in practical operations can take advantage of the enhancement effect of CO2/O2/NOx on increasing the Ca utilization and SO2 capture of the sorbent. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9012425 [article] Reactivities of NaOH enhanced iron blast furnace slag/hydrated lime sorbents toward SO2 at low temperatures : effects of the Presence of CO2, O2, and NOx [texte imprimé] / Liu, Chiung-Fang, Auteur ; Shih, Shin-Min, Auteur ; Yang, Jung-Hsin, Auteur . - 2010 . - pp 515–519. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 515–519 Mots-clés : Reactivities  NaOH  Hydrated  lime  sorbents. Résumé : The effects of the addition of NaOH on the reactivities toward SO2 of iron blast furnace slag/hydrated lime (BFS/HL) sorbents were studied without and with the presence of flue gas components, CO2, O2, and NOx, under the conditions prevailing in the bag filters of dry and semidry flue gas desulfurization processes. The reactivities of sorbents were markedly enhanced by the addition of NaOH when CO2, O2, and NOx were not present in the gas mixture. The enhancement effect mainly resulted from the deliquescent property of NaOH. With the presence of CO2, O2, and NOx at their typical concentrations in the flue gas, the sorbent reactivity was greatly increased due to the oxidation of bisulfite and sulfite ions to sulfate ions as well as the formation of deliquescent salts, calcium nitrite and nitrate, being enhanced by the presence of NO2 during the sulfation of a BFS/HL sorbent. The addition of NaOH in this case promoted the formation of sulfates but became less important in raising the sorbent reactivities for sorbents except BFS. Without the presence of CO2/O2/NOx, the BFS/HL sorbents with ratios ≤70/30 had higher reactivities than HL, but with the presence of CO2/O2/NOx, HL had the highest value of SO2 capture among the BFS/HL and BFS/HL/NaOH sorbents tested. Placing the SO2 removal unit before the NOx removal unit in practical operations can take advantage of the enhancement effect of CO2/O2/NOx on increasing the Ca utilization and SO2 capture of the sorbent. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9012425