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Détail de l'auteur
Auteur Qiang Xu
Documents disponibles écrits par cet auteur
Affiner la rechercheChemical plant flare minimization via plantwide dynamic simulation / Qiang Xu in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009)
in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3505–3512
Titre : Chemical plant flare minimization via plantwide dynamic simulation Type de document : texte imprimé Auteurs : Qiang Xu, Auteur ; Xiongtao Yang, Auteur ; Chaowei Liu, Auteur Année de publication : 2009 Article en page(s) : pp. 3505–3512 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Flare minimization Plant start-up operations Plantwide dynamic simulation Résumé : Flaring is crucial to chemical plant safety. However, excessive flaring, especially the intensive flaring during the chemical plant start-up operation, emits huge amounts of volatile organic compounds (VOCs) and highly reactive VOCs, which meanwhile results in tremendous industrial material and energy loss. Thus, the flare emission should be minimized if at all possible. This paper presents a general methodology on flare minimization for chemical plant start-up operations via plantwide dynamic simulation. The methodology starts with setup and validation of plantwide steady-state and dynamic simulation models. The validated dynamic model is then systematically transformed to the initial state of start-up and thereafter virtually run to check the plant start-up procedures. Any infeasible or risky scenarios will be fed back to plant engineers for operation improvement. The plantwide dynamic simulation provides an insight into process dynamic behaviors, which is crucial for the plant to minimize the flaring while maintaining operational feasibility and safety. The efficacy of the developed methodology has been demonstrated by a real start-up test. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8016219 [article] Chemical plant flare minimization via plantwide dynamic simulation [texte imprimé] / Qiang Xu, Auteur ; Xiongtao Yang, Auteur ; Chaowei Liu, Auteur . - 2009 . - pp. 3505–3512.
Chemical engineering
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3505–3512
Mots-clés : Flare minimization Plant start-up operations Plantwide dynamic simulation Résumé : Flaring is crucial to chemical plant safety. However, excessive flaring, especially the intensive flaring during the chemical plant start-up operation, emits huge amounts of volatile organic compounds (VOCs) and highly reactive VOCs, which meanwhile results in tremendous industrial material and energy loss. Thus, the flare emission should be minimized if at all possible. This paper presents a general methodology on flare minimization for chemical plant start-up operations via plantwide dynamic simulation. The methodology starts with setup and validation of plantwide steady-state and dynamic simulation models. The validated dynamic model is then systematically transformed to the initial state of start-up and thereafter virtually run to check the plant start-up procedures. Any infeasible or risky scenarios will be fed back to plant engineers for operation improvement. The plantwide dynamic simulation provides an insight into process dynamic behaviors, which is crucial for the plant to minimize the flaring while maintaining operational feasibility and safety. The efficacy of the developed methodology has been demonstrated by a real start-up test. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8016219
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
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
in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4360–4371
Titre : Dynamic simulation and optimization for the start - up operation of an ethylene oxide plant Type de document : texte imprimé Auteurs : Xiongtao Yang, Auteur ; Qiang Xu, Auteur ; Kuyen Li, Auteur Année de publication : 2010 Article en page(s) : pp. 4360–4371 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ethylene Oxide Résumé : Ethylene oxide (EO) is an important chemical intermediate for the production of various chemical products. The manufacturing of EO involves critical exothermic reactions at high temperature and high pressure, whose failure may cause catastrophic personal injury, severe air pollution, and tremendous economic loss. Thus, an EO plant must be well controlled under various situations, especially during its start-up operations. In this paper, a general methodology for improving chemical plant start-up operations through plant-wide dynamic simulation has been developed. It undergoes modeling and validations for steady-state, dynamic, and historian start-up operations. On the basis of the validated dynamic simulation model, the original plant start-up strategy is further examined and optimized to speed-up the plant start-up operation with enhanced safety considerations. A case study on an EO plant start-up has demonstrated the significant operational and economic benefits of the proposed methodology. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019038 [article] Dynamic simulation and optimization for the start - up operation of an ethylene oxide plant [texte imprimé] / Xiongtao Yang, Auteur ; Qiang Xu, Auteur ; Kuyen Li, Auteur . - 2010 . - pp. 4360–4371.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4360–4371
Mots-clés : Ethylene Oxide Résumé : Ethylene oxide (EO) is an important chemical intermediate for the production of various chemical products. The manufacturing of EO involves critical exothermic reactions at high temperature and high pressure, whose failure may cause catastrophic personal injury, severe air pollution, and tremendous economic loss. Thus, an EO plant must be well controlled under various situations, especially during its start-up operations. In this paper, a general methodology for improving chemical plant start-up operations through plant-wide dynamic simulation has been developed. It undergoes modeling and validations for steady-state, dynamic, and historian start-up operations. On the basis of the validated dynamic simulation model, the original plant start-up strategy is further examined and optimized to speed-up the plant start-up operation with enhanced safety considerations. A case study on an EO plant start-up has demonstrated the significant operational and economic benefits of the proposed methodology. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019038
in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5734–5741
Titre : Emission source characterization for proactive flare minimization during ethylene plant start-ups Type de document : texte imprimé Auteurs : Chaowei Liu, Auteur ; Qiang Xu, Auteur Année de publication : 2010 Article en page(s) : pp. 5734–5741 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ethylene plant start-ups Plant-wide dynamic simulations Résumé : Ethylene plant start-ups generate huge amounts of off-spec products for flaring, which cause negative environmental and societal impacts, as well as tremendous raw material and energy losses that could be unitized to generate much more needed products. Thus, cost-effective start-up flare minimization strategies through proactive process design and operation are becoming more important and attractive to the industry. However, fundamental and quantitative studies on start-up flaring emissions are still lacking, such as (i) what kinds of emission species are contained in the flaring sources; (ii) how much of each emission source will be generated during one start-up; and (iii) what is the dynamic emission profile of each emission source with respect to the start-up time? In this paper, rigorous plant-wide dynamic simulations are employed to characterize flaring emission sources under different flare minimization strategies for an ethylene plant start-up. Deep insights of the emission source distribution and simulated dynamic emission profiles are provided. The study enriches the emission inventory with details for industry point sources, which have never been compiled previously. It also provides detailed technical support for both the industry and environmental agencies on evaluating and developing cost-effective flare minimization strategies in the future. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902002c [article] Emission source characterization for proactive flare minimization during ethylene plant start-ups [texte imprimé] / Chaowei Liu, Auteur ; Qiang Xu, Auteur . - 2010 . - pp. 5734–5741.
Chemical engineering
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5734–5741
Mots-clés : Ethylene plant start-ups Plant-wide dynamic simulations Résumé : Ethylene plant start-ups generate huge amounts of off-spec products for flaring, which cause negative environmental and societal impacts, as well as tremendous raw material and energy losses that could be unitized to generate much more needed products. Thus, cost-effective start-up flare minimization strategies through proactive process design and operation are becoming more important and attractive to the industry. However, fundamental and quantitative studies on start-up flaring emissions are still lacking, such as (i) what kinds of emission species are contained in the flaring sources; (ii) how much of each emission source will be generated during one start-up; and (iii) what is the dynamic emission profile of each emission source with respect to the start-up time? In this paper, rigorous plant-wide dynamic simulations are employed to characterize flaring emission sources under different flare minimization strategies for an ethylene plant start-up. Deep insights of the emission source distribution and simulated dynamic emission profiles are provided. The study enriches the emission inventory with details for industry point sources, which have never been compiled previously. It also provides detailed technical support for both the industry and environmental agencies on evaluating and developing cost-effective flare minimization strategies in the future. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902002c
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