Documents disponibles écrits par cet auteur

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

Fault localization in batch processes through progressive principal component analysis modeling / Jeong Jin Hong in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8153-8162 Titre : Fault localization in batch processes through progressive principal component analysis modeling Type de document : texte imprimé Auteurs : Jeong Jin Hong, Auteur ; Jie Zhang, Auteur ; Julian Morris, Auteur Année de publication : 2011 Article en page(s) : pp. 8153-8162 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Principal  component  analysis  Batchwise Résumé : A technique for fault localization in batch processes using progressive principal component analysis (PCA) modeling is proposed in this paper. A PCA model is developed from normal process operation data and is used for online process monitoring. Once a fault is detected by the PCA model, process variables that are related to the fault are identified using contribution analysis. The time information on when abnormalities occurred in these variables is identified using a time series plot of the squared prediction errors (SPE) on these variables. These variables are then removed and another PCA model is developed using the remaining variables. If the faulty batch cannot be detected by the new PCA model, then the remaining variables are not related to the fault. If the faulty batch can still be detected by the new PCA model, then further variables associated with the fault are identified from SPE contribution analysis. The procedure is repeated until the faulty batch can no longer be detected using the remaining variables. Using the time information on when abnormalities presented in the variables associated with the fault, fault propagation paths can be established and the origin of the fault could be traced. The proposed method is tested on a benchmark simulated fed-batch penicillin production process, PenSim. The results demonstrate that the proposed method is particularly effective in isolating faults that have occurred on measured variables. For more complex faults that have occurred on unmeasured variables, the method can identify variables affected by the fault, and process knowledge is required to determine the fault. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332140 [article] Fault localization in batch processes through progressive principal component analysis modeling [texte imprimé] / Jeong Jin Hong, Auteur ; Jie Zhang, Auteur ; Julian Morris, Auteur . - 2011 . - pp. 8153-8162. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8153-8162 Mots-clés : Modeling  Principal  component  analysis  Batchwise Résumé : A technique for fault localization in batch processes using progressive principal component analysis (PCA) modeling is proposed in this paper. A PCA model is developed from normal process operation data and is used for online process monitoring. Once a fault is detected by the PCA model, process variables that are related to the fault are identified using contribution analysis. The time information on when abnormalities occurred in these variables is identified using a time series plot of the squared prediction errors (SPE) on these variables. These variables are then removed and another PCA model is developed using the remaining variables. If the faulty batch cannot be detected by the new PCA model, then the remaining variables are not related to the fault. If the faulty batch can still be detected by the new PCA model, then further variables associated with the fault are identified from SPE contribution analysis. The procedure is repeated until the faulty batch can no longer be detected using the remaining variables. Using the time information on when abnormalities presented in the variables associated with the fault, fault propagation paths can be established and the origin of the fault could be traced. The proposed method is tested on a benchmark simulated fed-batch penicillin production process, PenSim. The results demonstrate that the proposed method is particularly effective in isolating faults that have occurred on measured variables. For more complex faults that have occurred on unmeasured variables, the method can identify variables affected by the fault, and process knowledge is required to determine the fault. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332140

Flocculation properties and antimicrobial activities of quaternized celluloses synthesized in NaOH/Urea aqueous solution / Yongbo Song in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1242–1246 Titre : Flocculation properties and antimicrobial activities of quaternized celluloses synthesized in NaOH/Urea aqueous solution Type de document : texte imprimé Auteurs : Yongbo Song, Auteur ; Jie Zhang, Auteur ; Weiping Gan, Auteur ; Jinping Zhou, Auteur Année de publication : 2010 Article en page(s) : pp. 1242–1246 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Flocculation--Antimicrobial--Quaternized--Celluloses--Synthesized  --NaOH/Urea--Aqueous--Solution Résumé : Three water-soluble quaternized cellulose derivatives (QCs) with degree of substitution (DS) values of 0.38, 0.50, and 0.74 were synthesized in NaOH/urea aqueous solutions. The flocculation characteristics of QCs have been evaluated in montmorillonite (MMT) suspensions and simulated dye (Reactive Red) aqueous solutions by spectrophotometry. The results showed that QCs were effective flocculating agents for MMT over a wide range of pH values, and the flocculation efficiency of MMT was up to nearly 100%. Decolorization efficiency of Reactive Red dye reached 93% under optimum conditions. In vitro antimicrobial activity of QC was evaluated by determining minimum inhibition concentration (MIC) values against Gram-positive bacteria (S. aureus) and Gram-negative bacteria (E. coli), respectively. The results showed that QC could strongly inhibit the growth of E. coli and S. aureus. Therefore, quaternized cellulose is applicable as a novel wastewater treatment agent with high flocculation efficiency as well as effective antimicrobial activity. Note de contenu : Bibiogra. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9015057 [article] Flocculation properties and antimicrobial activities of quaternized celluloses synthesized in NaOH/Urea aqueous solution [texte imprimé] / Yongbo Song, Auteur ; Jie Zhang, Auteur ; Weiping Gan, Auteur ; Jinping Zhou, Auteur . - 2010 . - pp. 1242–1246. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1242–1246 Mots-clés : Flocculation--Antimicrobial--Quaternized--Celluloses--Synthesized  --NaOH/Urea--Aqueous--Solution Résumé : Three water-soluble quaternized cellulose derivatives (QCs) with degree of substitution (DS) values of 0.38, 0.50, and 0.74 were synthesized in NaOH/urea aqueous solutions. The flocculation characteristics of QCs have been evaluated in montmorillonite (MMT) suspensions and simulated dye (Reactive Red) aqueous solutions by spectrophotometry. The results showed that QCs were effective flocculating agents for MMT over a wide range of pH values, and the flocculation efficiency of MMT was up to nearly 100%. Decolorization efficiency of Reactive Red dye reached 93% under optimum conditions. In vitro antimicrobial activity of QC was evaluated by determining minimum inhibition concentration (MIC) values against Gram-positive bacteria (S. aureus) and Gram-negative bacteria (E. coli), respectively. The results showed that QC could strongly inhibit the growth of E. coli and S. aureus. Therefore, quaternized cellulose is applicable as a novel wastewater treatment agent with high flocculation efficiency as well as effective antimicrobial activity. Note de contenu : Bibiogra. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9015057

Selective catalytic reduction for NO removal / Zhigang Lei in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp 5942–5951 Titre : Selective catalytic reduction for NO removal : comparison of transfer and reaction performances among monolith catalysts Type de document : texte imprimé Auteurs : Zhigang Lei, Auteur ; Cuiping Wen, Auteur ; Jie Zhang, Auteur Année de publication : 2011 Article en page(s) : pp 5942–5951 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Monolith  catalysts Résumé : One of the available technologies that can effectively control the emission of NOx is the selective catalytic reduction (SCR) of NOx with ammonia (NH3). Monolith catalysts are widely used in this technology due to their unique advantages that they offer, like low pressure drop, high external geometric surface area, and resistance to deposition of carbon, dust, and metals from combustion process. But the configuration of monolith catalysts has prominent influence on transfer and reaction performances of SCR for NO removal. This work tries to provide an easy-to-read and comprehensive comparison of momentum transfer, heat transfer, mass transfer, and reaction performance between two types of monolith catalysts with five kinds of channel shapes for SCR for NO removal, and to address the issues specific to SCR applications as to (i) whether or not monolith catalysts can improve the transfer and reaction performances compared to traditional pellet packed-bed reactors; (ii) which type of monolith catalysts and (iii) which kind of channel shapes for each type are optimum from the viewpoint of chemical reaction engineering. It was found that monolith catalysts have a much lower pressure drop and higher effectiveness factor than traditional pellet packed-bed reactors, and a coating catalyst seems more suitable than an extruded catalyst for SCR for NO removal. Although a round channel brings the best heat and mass transfer, a triangle-shaped channel of coating catalyst possesses the highest NOx conversion due to the chemical reaction being the controlling step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102206x [article] Selective catalytic reduction for NO removal : comparison of transfer and reaction performances among monolith catalysts [texte imprimé] / Zhigang Lei, Auteur ; Cuiping Wen, Auteur ; Jie Zhang, Auteur . - 2011 . - pp 5942–5951. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp 5942–5951 Mots-clés : Monolith  catalysts Résumé : One of the available technologies that can effectively control the emission of NOx is the selective catalytic reduction (SCR) of NOx with ammonia (NH3). Monolith catalysts are widely used in this technology due to their unique advantages that they offer, like low pressure drop, high external geometric surface area, and resistance to deposition of carbon, dust, and metals from combustion process. But the configuration of monolith catalysts has prominent influence on transfer and reaction performances of SCR for NO removal. This work tries to provide an easy-to-read and comprehensive comparison of momentum transfer, heat transfer, mass transfer, and reaction performance between two types of monolith catalysts with five kinds of channel shapes for SCR for NO removal, and to address the issues specific to SCR applications as to (i) whether or not monolith catalysts can improve the transfer and reaction performances compared to traditional pellet packed-bed reactors; (ii) which type of monolith catalysts and (iii) which kind of channel shapes for each type are optimum from the viewpoint of chemical reaction engineering. It was found that monolith catalysts have a much lower pressure drop and higher effectiveness factor than traditional pellet packed-bed reactors, and a coating catalyst seems more suitable than an extruded catalyst for SCR for NO removal. Although a round channel brings the best heat and mass transfer, a triangle-shaped channel of coating catalyst possesses the highest NOx conversion due to the chemical reaction being the controlling step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102206x