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Enhancing a smelter off-gas system using a plant-wide control design / Antonio C. B. De Araujo in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3004–3013 Titre : Enhancing a smelter off-gas system using a plant-wide control design Type de document : texte imprimé Auteurs : Antonio C. B. De Araujo, Auteur ; Helen Shang, Auteur Année de publication : 2009 Article en page(s) : pp. 3004–3013 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Off-gas  treatment  system  Smelter  roaster  processes  Systematic  control  design  Steady-state  analysis Résumé : An off-gas treatment system is a vital component of smelter roaster processes as it ensures operation is in accordance with environmental regulations in terms of hazardous emissions. It is, therefore, paramount that a well-designed control structure be incorporated into the system. Analysis of the off-gas treatment processes for a roaster using a systematic control design procedure to provide the necessary verification to current industrial practices for controlling these processes was carried out. We approached this by conducting a top-down (steady-state) analysis based on an available nonlinear model of the process. The results provide insight into, and potential improvement of, the control of the off-gas system. Through designing the bottom-up structure, a feedback control structure was developed to give robust and effective control in terms of disturbance rejection capabilities. The proposed control structure provides for improved performance in an easy form to implement. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800254s [article] Enhancing a smelter off-gas system using a plant-wide control design [texte imprimé] / Antonio C. B. De Araujo, Auteur ; Helen Shang, Auteur . - 2009 . - pp. 3004–3013. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3004–3013 Mots-clés : Off-gas  treatment  system  Smelter  roaster  processes  Systematic  control  design  Steady-state  analysis Résumé : An off-gas treatment system is a vital component of smelter roaster processes as it ensures operation is in accordance with environmental regulations in terms of hazardous emissions. It is, therefore, paramount that a well-designed control structure be incorporated into the system. Analysis of the off-gas treatment processes for a roaster using a systematic control design procedure to provide the necessary verification to current industrial practices for controlling these processes was carried out. We approached this by conducting a top-down (steady-state) analysis based on an available nonlinear model of the process. The results provide insight into, and potential improvement of, the control of the off-gas system. Through designing the bottom-up structure, a feedback control structure was developed to give robust and effective control in terms of disturbance rejection capabilities. The proposed control structure provides for improved performance in an easy form to implement. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800254s

Systematic approach to the design of operation and control policies in activated sludge systems / Antonio C. B. De Araujo in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8542–8557 Titre : Systematic approach to the design of operation and control policies in activated sludge systems Type de document : texte imprimé Auteurs : Antonio C. B. De Araujo, Auteur ; Simone Gallani, Auteur ; Michela Mulas, Auteur Année de publication : 2011 Article en page(s) : pp. 8542–8557 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biological  wastewater  treatment  process  Activated  sludge Résumé : This article describes the systematic design of a control structure for a biological wastewater treatment process as given by the test-bed Benchmark Simulation Model No. 1 (BSM1) and Activated Sludge Model No. 1 (ASM1). The objective of this work was to formalize and implement a systematic and yet simple procedure for the selection of control structures in wastewater treatment plants (WWTPs) and to show that the application of the proposed methodology agrees with the “empirical”’ findings regarding the operation of this process. The motivation underlying this endeavor was to search for a control configuration that leads to optimal economic operation while promptly rejecting disturbances at lower layers in the control hierarchy, thus avoiding violation of the more important regulatory constraints on effluent discharge. We started by optimizing a steady-state nonlinear model of the process for various important disturbances. The results confirmed that it is economically optimal to control the oxygen concentration in the aerobic basins and the nitrate in the second anoxic tank at their respective lower bounds, whereas the effluent ammonia from the bioreactors should be controlled at its upper limit. In addition, because it is good practice to operate with minimal manipulation, the wastage flow rate should be fixed at its nominal optimal set point. The proposed decentralized control configuration, consisting of simple PI controllers, is capable of maintaining the process well within the regulatory limits at a small cost when dynamic disturbances represented by three weather files affect the process, therefore suggesting that, according to the applied systematic methodology, more complex (multivariable) regulators are not necessary for the ASM1 process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101703s [article] Systematic approach to the design of operation and control policies in activated sludge systems [texte imprimé] / Antonio C. B. De Araujo, Auteur ; Simone Gallani, Auteur ; Michela Mulas, Auteur . - 2011 . - pp. 8542–8557. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8542–8557 Mots-clés : Biological  wastewater  treatment  process  Activated  sludge Résumé : This article describes the systematic design of a control structure for a biological wastewater treatment process as given by the test-bed Benchmark Simulation Model No. 1 (BSM1) and Activated Sludge Model No. 1 (ASM1). The objective of this work was to formalize and implement a systematic and yet simple procedure for the selection of control structures in wastewater treatment plants (WWTPs) and to show that the application of the proposed methodology agrees with the “empirical”’ findings regarding the operation of this process. The motivation underlying this endeavor was to search for a control configuration that leads to optimal economic operation while promptly rejecting disturbances at lower layers in the control hierarchy, thus avoiding violation of the more important regulatory constraints on effluent discharge. We started by optimizing a steady-state nonlinear model of the process for various important disturbances. The results confirmed that it is economically optimal to control the oxygen concentration in the aerobic basins and the nitrate in the second anoxic tank at their respective lower bounds, whereas the effluent ammonia from the bioreactors should be controlled at its upper limit. In addition, because it is good practice to operate with minimal manipulation, the wastage flow rate should be fixed at its nominal optimal set point. The proposed decentralized control configuration, consisting of simple PI controllers, is capable of maintaining the process well within the regulatory limits at a small cost when dynamic disturbances represented by three weather files affect the process, therefore suggesting that, according to the applied systematic methodology, more complex (multivariable) regulators are not necessary for the ASM1 process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101703s