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Optimizing crude oil operations scheduling considering blending in tanks

IFAC-PapersOnLine 2024年第14期58卷 67-72页

作者： Tomas Garcia Garcia-Verdier Gloria Gutierrez Carlos Mendez Cesar de Prada Dpt. of Systems Engineering and Automatic Control University of Valladolid Valladolid Spain Institute of Sustainable Processes University of Valladolid Valladolid Spain Center for Advanced Process Systems Engineering (CAPSE) INTEC (UNL - CONICET) Argentina

This paper focuses on the optimization of crude oil operations scheduling in a refinery that is supplied with crude oil by ship. One of the main challenges associated with the crude oil operations scheduling problem is the management of crude storage in tanks. Since storage capacity is limited and there are several types of crude oil depending on their composition, it is necessary to store mixtures of crude oil in tanks. This feature makes necessary the inclusion of nonlinear, non-convex constraints, which complicates the resolution of mathematical programming models. To address this problem, we have developed a mathematical programming model based on a continuous-time formulation using time slots, along with a strategy based on piecewise McCormick relaxation that allows us to efficiently handle the nonlinear constraints generated by blending crude oils in tanks.

关键词： Modelling decision making in complex systems Efficient strategies for large scale complex systems Production planning control Optimization control of large-scale network systems Complex logistic systems

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Optimizing the monthly scheduling of crudes in a terminal-refinery system

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IFAC-PapersOnLine 2023年第2期56卷 7414-7419页

This paper focuses on solving the optimization of crude oil operations scheduling carried out in a real system composed of a refinery and a marine terminal, over a monthly horizon. In the present article, we introduce a large-scale mixed-integer non-linear programming (MINLP) model that faithfully represents the operation and characteristics of the system. Considering the model's complexity and its non-linear and non-convex nature, the challenge lies in solving the model in a time frame that meets the user's needs. To tackle this problem, we develop a temporal decomposition method in conjunction with a linear approximation.

关键词： Modelling and decision making in complex systems Production planning and control Continuous-time representation Optimization and control of large-scale network systems Temporal decomposition method

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Challenges and opportunities for the control of energy storage systems. a focus on the zinc-air batteries

Challenges and opportunities for the control of energy stora...

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2021 IEEE AFRICON, AFRICON 2021

作者： Olaru, Sorin Stoican, Florin Kheawhom, Soorathep University Paris-Saclay CentraleSupélec Laboratory of Signals and Systems Gif sur Yvette France University Politehnica of Bucharest Faculty of Automatic Control and Computers Bucharest060042 Romania Chulalongkorn University Faculty of Engineering Dpt. Chemical Engineering Bangkok Thailand

ISBN: (纸本)9781665419840

The paper aims to review recent developments and points to the challenges and opportunities for the instrumentation, control and management technologies in relationship with the emergence of novel Energy Storage systems. It exemplifies this trend with a technology that has received an increasing interest in recent studies, the Zinc-Air batteries. © 2021 IEEE.

关键词： Zinc

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Closed-loop Scheduling in a canned food factory

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IFAC-PapersOnLine 2020年第2期53卷 10791-10796页

作者： C.G. Palacín C. Vilas A.A. Alonso José L. Pitarch C. de Prada Systems engineering and Automatic Control Dpt. University of Valladolid Valladolid Spain (Bio)Process engineering Group Instituto de Investigaciones Marinas (CSIC) Vigo Spain

This paper addresses the problem of closed-loop operation of scheduling, together with the interaction of control and scheduling, for a class of processes that appear very often in industry: those that combine continuous production lines with parallel batch units that share some resources. The paper presents a novel approach to this problem, including batching and a new type of precedence in the assignment problem. It also considers the effect of shared resources on the duration of the cycle time of the batch units. The approach is illustrated with a real-life example of a canned tuna factory

关键词： Integration of scheduling control shared resources tuna cans sterilisation process optimisation continuous-batch process scheduling

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Optimal Coordination Of Batch Processes with Shared Resources

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IFAC-PapersOnLine 2019年第1期52卷 826-831页

作者： Carlos G. Palacín Cesar de Prada Dpt. Of Systems Engineering and Automatic Control Escuela de Ingenierías Industrials Sede Mergelina Universidad de Valladolid C/Real de Burgos s/n Valladolid 47011 SPAIN Institute of Sustainable Processes (IPS) University of Valladolid C/Real de Burgos s/n Valladolid 47011 SPAIN

This paper deals with the scheduling of batch processes that share common resources having consumption profiles that change over time and are subjected to some global constraints. In order to approach the problem, the formulation mixes three different time basis. Scheduling is performed in continuous time, but the description of the shared resources and the global constraints uses discrete values. The method is applied to a challenging problem in a tuna canning factory that mixes continuous flows of cans with the batch operation of a set of sterilizers sharing the steam supply line.

关键词： Process scheduling shared resources tuna cans sterilization process optimization continuous-batch process scheduling

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Erratum to “Modifier Adaptation methodology based on transient and static measurements for RTO to cope with structural uncertainty” [Comput. Chem. Eng. 106 (2017) 480–500]

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Computers & Chemical engineering 2018年 108卷 460-460页

作者： T. Rodríguez-Blanco D. Sarabia J.L. Pitarch C. de Prada Dpt. of Systems Engineering and Automatic Control University of Valladolid Doctor Mergelina s/n 47011 Valladolid Spain Dpt. of Electromechanical Engineering University of Burgos Avda. Cantabria s/n 09006 Burgos Spain

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Modifier-Adaptation approach to deal with structural and parametric uncertainty

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IFAC-PapersOnLine 2016年第7期49卷 851-856页

作者： Rodríguez-Blanco, T. Sarabia, D. De Prada, C. Dpt of Systems Engineering and Automatic Control University of Valladolid Doctor Mergelina s/n Valladolid47011 Spain Dpt of Electromechanical Engineering University of Burgos Avda. Cantabria s/n Burgos09006 Spain

Real-Time Optimization (RTO) is not always able to achieve optimal process operation due to the presence of significant uncertainty about the plant models that are used to make decisions and also due to the differences between control architecture layers which operate on different time-scales and use different kind of models. To overcome these issues the economic optimization problem is modified following the Modifier Adaptation methodology to bring the process to the real optimum despite the presence of uncertainty by using plant measurements. To deal with parametric and structural plant-model mismatch, a new approach is presented that combines the estimation of process gradients from transient and steady-state information. It speeds up the convergence of Modifier Adaptation methodology to the process optimum. The approach is illustrated through the simulated example of a depropanizer distillation column. © 2016

关键词： Distillation columns Uncertainty analysis control architecture Economic optimization Estimation of process modifier adaptation Parametric uncertainties Plant model mismatches Real time optimization uncertainty

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Hierarchical Optimal Operation of Continuous-Batch Processes

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IFAC-PapersOnLine 2015年第23期48卷 294-301页

作者： De Prada, C. Cristea, S.P. Mazaeda, R. Dpt. of Systems Engineering and Automatic Control University of Valladolid Valladolid47011 Spain

This paper presents a methodology for the optimal operation of mixed continuous-batch processes based on a hierarchical decomposition of the problem: local dynamic optimizers perform the economic optimization of the batch units or continuous plants, while the upper layer deals with the scheduling of the batch units and the coordination of the flows and properties of sub-processes using a novel simplified model built with predictions from the lower level. The approach is illustrated with a case study from the sugar industry corresponding to the joint operation of the evaporation and crystallization sections operated to maximize production with minimum energy consumption. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Sugar industry Batch data processing Energy utilization Hierarchical systems Optimization Scheduling algorithms Continuous batch Continuous plant Economic optimization Hierarchical control Hierarchical decompositions Minimum energy consumption NMPC Optimal operation

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Modifier-Adaptation methodology for RTO applied to Distillation Columns using a simplified steady-state model

Modifier-Adaptation methodology for RTO applied to Distillat...

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IEEE Multi-Conference on systems and control

作者： T. Rodriguez-Blanco D. Sarabia C. de Prada Dpt of Systems Engineering and Automatic Control University of Valladolid Dpt of Electromechanical Engineering University of Burgos

ISBN: (纸本)9781509007561

Real-Time Optimization (RTO) is not always able to achieve optimal process operation due to different reasons, among them the presence of significant uncertainty in the plant models that are used to make decisions or the differences between control architecture layers which operate at different time-scales and use different kind of models. To overcome these issues the economic optimization problem, solved in the RTO layer, is modified following the Modifier Adaptation methodology (MA) to bring the process to the real optimum despite the presence of uncertainty by using plant measurements. This paper presents the implementation of MA methodology to the optimal management of distillation columns as a depropanizer column. Specifically, two approaches have been implemented starting from the traditional gradient-based technique called Dual Modifier Adaptation (DMA) to the recent approach Nested Modifier Adaptation (NMA), updating modifiers at the steady state of the process using static information. The RTO layer is based on a really simplified static model of the process which implies the presence of strong structural plant-model mismatch.

关键词： Distillation columns Modifiers static models real time operating system Steady state Mission Assurance

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Autotuning of an in-line pH control system

Autotuning of an in-line pH control system

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Pedro Mercader Kristian Soltesz Alfonso Baños Dpt. Computer and Systems Engineering University of Murcia Murcia Spain Dpt. Automatic Control Lund University Lund Sweden

A novel autotuning procedure is presented through application to an industrial in-line pH control system. The procedure has three advantages over classical relay auto-tuners: experiment duration is very short (no need for limit-cycle convergence); all data is used for identification (instead of only peaks and switch instances); a parameter uncertainty model is identified and utilized for robust controller synthesis.

关键词： Relays Process control Robustness Switches Limit-cycles Convergence

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