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Cyclic scheduling for ethylene cracking furnace system with consideration of secondary ethane cracking / Chuanyu Zhao in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5765–5774 Titre : Cyclic scheduling for ethylene cracking furnace system with consideration of secondary ethane cracking Type de document : texte imprimé Auteurs : Chuanyu Zhao, Auteur ; Chaowei Liu, Auteur ; Qiang Xu, Auteur Année de publication : 2010 Article en page(s) : pp. 5765–5774 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cracking  furnace  systems  Mixed-integer  nonlinear  programming  Scheduling  model Résumé : Cracking furnaces of ethylene plants are capable of processing multiple feeds to produce smaller hydrocarbon molecules, such as ethylene, propylene, and ethane. The best practice for handling the produced ethane is to recycle it as an internal feed and conduct the secondary cracking in a specific furnace. As cracking furnaces have to be periodically shut down for decoking, when multiple furnaces processing different feeds under various product values and manufacturing costs are considered, the operational scheduling for the entire furnace system should be optimized to achieve the best economic performance. In this paper, a new MINLP (mixed-integer nonlinear programming) model has been developed to optimize the operation of cracking furnace systems with the consideration of secondary ethane cracking. This model is more practical than the previous study and can simultaneously identify the allocation of feeds with their quantity, time, and sequence information for each cracking furnace. A case study has demonstrated the efficacy of the developed scheduling model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001235 [article] Cyclic scheduling for ethylene cracking furnace system with consideration of secondary ethane cracking [texte imprimé] / Chuanyu Zhao, Auteur ; Chaowei Liu, Auteur ; Qiang Xu, Auteur . - 2010 . - pp. 5765–5774. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5765–5774 Mots-clés : Cracking  furnace  systems  Mixed-integer  nonlinear  programming  Scheduling  model Résumé : Cracking furnaces of ethylene plants are capable of processing multiple feeds to produce smaller hydrocarbon molecules, such as ethylene, propylene, and ethane. The best practice for handling the produced ethane is to recycle it as an internal feed and conduct the secondary cracking in a specific furnace. As cracking furnaces have to be periodically shut down for decoking, when multiple furnaces processing different feeds under various product values and manufacturing costs are considered, the operational scheduling for the entire furnace system should be optimized to achieve the best economic performance. In this paper, a new MINLP (mixed-integer nonlinear programming) model has been developed to optimize the operation of cracking furnace systems with the consideration of secondary ethane cracking. This model is more practical than the previous study and can simultaneously identify the allocation of feeds with their quantity, time, and sequence information for each cracking furnace. A case study has demonstrated the efficacy of the developed scheduling model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001235

Dynamic scheduling for ethylene cracking furnace system / Chuanyu Zhao in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12026-12040 Titre : Dynamic scheduling for ethylene cracking furnace system Type de document : texte imprimé Auteurs : Chuanyu Zhao, Auteur ; Chaowei Liu, Auteur ; Qiang Xu, Auteur Année de publication : 2011 Article en page(s) : pp. 12026-12040 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Cracking  Scheduling Résumé : The craking furnace system is crucial for an olefin plant. its operation needs to follow a predefined schelule to process various feeds continuously, meanwhile conducting a periodically decoking operation for each furnace when its performance apparently decreases. In practice, because the feed supply changes dynamically, the routine furnace scheduling is better performed in a dynamic and reactive way, through which the furnace operations can be smartly rescheduled with respect to any delivery of new coming feeds. Thus, the feeds from the new delivery and the leftover inventories can be timely, feasibly, and optimally allocated to different furnaces for processing to obtain the maximum average net profit per time. Facing this challenge, this paper develops a new MINLP-based reactive scheduling strategy, which can dynamically generate reschedules based on the new feed deliveries, the leftover feeds, and current furnace operating conditions. It simultaneously addresses all the major scheduling issues of a cracking furnace system, such as semicontinuous operation, nonsimultaneous decoking, secondary ethane cracking, and seamless rescheduling. The efficacy of the study and its significant economic potential are demonstrated by a comprehensive case study. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697522 [article] Dynamic scheduling for ethylene cracking furnace system [texte imprimé] / Chuanyu Zhao, Auteur ; Chaowei Liu, Auteur ; Qiang Xu, Auteur . - 2011 . - pp. 12026-12040. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12026-12040 Mots-clés : Cracking  Scheduling Résumé : The craking furnace system is crucial for an olefin plant. its operation needs to follow a predefined schelule to process various feeds continuously, meanwhile conducting a periodically decoking operation for each furnace when its performance apparently decreases. In practice, because the feed supply changes dynamically, the routine furnace scheduling is better performed in a dynamic and reactive way, through which the furnace operations can be smartly rescheduled with respect to any delivery of new coming feeds. Thus, the feeds from the new delivery and the leftover inventories can be timely, feasibly, and optimally allocated to different furnaces for processing to obtain the maximum average net profit per time. Facing this challenge, this paper develops a new MINLP-based reactive scheduling strategy, which can dynamically generate reschedules based on the new feed deliveries, the leftover feeds, and current furnace operating conditions. It simultaneously addresses all the major scheduling issues of a cracking furnace system, such as semicontinuous operation, nonsimultaneous decoking, secondary ethane cracking, and seamless rescheduling. The efficacy of the study and its significant economic potential are demonstrated by a comprehensive case study. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697522

Pressure-driven dynamic simulation for improving the performance of a multistage compression system during plant startup / Xiongtao Yang in Industrial & engineering chemistry research, Vol. 48 N° 20 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. Titre : Pressure-driven dynamic simulation for improving the performance of a multistage compression system during plant startup Type de document : texte imprimé Auteurs : Xiongtao Yang, Auteur ; Qiang Xu, Auteur ; Chuanyu Zhao, Auteur Année de publication : 2010 Article en page(s) : pp. Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Multistage  compression  systems  Pressure-driven  dynamic  simulations  Plant  startup Résumé : Multistage compression systems (MSCS) are the most important and valuable facilities in chemical plants, whose failure may cause severe accidents and/or tremendous economic loss. Thus, operation for MSCS needs sufficient care under various situations, especially during plant startup. This paper employs rigorous pressure-driven dynamic simulations to examine and improve operation safety of the cracked gas compression system during an ethylene plant startup. For safety consideration, antisurge process design and control strategies are dynamically evaluated along with startup procedures. Operating point trajectory for each compressor and their potential safety problems are identified. Assisted by the rigorous dynamic simulation, the plant startup procedure is improved with better safety performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900212v [article] Pressure-driven dynamic simulation for improving the performance of a multistage compression system during plant startup [texte imprimé] / Xiongtao Yang, Auteur ; Qiang Xu, Auteur ; Chuanyu Zhao, Auteur . - 2010 . - pp. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. Mots-clés : Multistage  compression  systems  Pressure-driven  dynamic  simulations  Plant  startup Résumé : Multistage compression systems (MSCS) are the most important and valuable facilities in chemical plants, whose failure may cause severe accidents and/or tremendous economic loss. Thus, operation for MSCS needs sufficient care under various situations, especially during plant startup. This paper employs rigorous pressure-driven dynamic simulations to examine and improve operation safety of the cracked gas compression system during an ethylene plant startup. For safety consideration, antisurge process design and control strategies are dynamically evaluated along with startup procedures. Operating point trajectory for each compressor and their potential safety problems are identified. Assisted by the rigorous dynamic simulation, the plant startup procedure is improved with better safety performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900212v