Luis T. Antelo
Spanish National Research Council
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Featured researches published by Luis T. Antelo.
Computers & Chemical Engineering | 2008
Oliver Exler; Luis T. Antelo; José Egea; Antonio A. Alonso; Julio R. Banga
In this contribution, we consider mixed-integer nonlinear programming problems subject to differential-algebraic constraints. This class of problems arises frequently in process design, and the particular case of integrated process and control system design is considered. Since these problems are frequently non-convex, local optimization techniques usually fail to locate the global solution. Here, we propose a global optimization algorithm, based on extensions of the metaheuristic Tabu Search, in order to solve this challenging class of problems in an efficient and robust way. The ideas of the methodology are explained and, on the basis of two case studies, the performance of the approach is evaluated. The first benchmark problem is a Wastewater Treatment Plant model [Alex, J., Bteau, J. F., Copp, J. B., Hellinga, C., Jeppsson, U., Marsili-Libelli, S., et al. (1999). Benchmark for evaluating control strategies in wastewater treatment plants. InProceedings of the ECC’99 conference] for nitrogen removal and the second case study is the well-known Tennessee Eastman Process [Downs, J. J., & Vogel, E. F. (1993). A plant-wide industrial process control problem. Computers & Chemical Engineering, 17, 245-255]. Numerical experiments with our new method indicate that we can achieve an improved performance in both cases. Additionally, our method outperforms several other recent competitive solvers for the two challenging case studies considered.
Waste Management | 2015
Carla Lopes; Luis T. Antelo; Amaya Franco-Uría; Antonio A. Alonso; Ricardo I. Pérez-Martín
Reuse and valorisation of fish by-products is a key process for marine resources conservation. Usually, fishmeal and oil processing factories collect the by-products generated by fishing port and industry processing activities, producing an economical benefit to both parts. In the same way, different added-value products can be recovered by the valorisation industries whereas fishing companies save the costs associated with the management of those wastes. However, it is important to estimate the advantages of valorisation processes not only in terms of economic income, but also considering the environmental impacts. This would help to know if the valorisation of a residue provokes higher impact than other waste management options, which means that its advantages are probably not enough for guarantying a sustainable waste reuse. To that purpose, there are several methodologies to evaluate the environmental impacts of processes, including those of waste management, providing different indicators which give information on relevant environmental aspects. In the current study, a comparative environmental assessment between a valorisation process (fishmeal and oil production) and different waste management scenarios (composting, incineration and landfilling) was developed. This comparison is a necessary step for the development and industrial implementation of these processes as the best alternative treatment for fish by-products. The obtained results showed that both valorisation process and waste management treatments presented similar impacts. However, a significant benefit can be achieved through valorisation of fish by-products. Additionally, the implications of the possible presence of pollutants were discussed.
Marine Pollution Bulletin | 2012
Luis T. Antelo; Carla Lopes; Amaya Franco-Uría; Antonio A. Alonso
Fish discards and by-catch issues are highly topical subjects that are permanently under a social focus. Two main approaches are being considered to address this discard problem: reducing the by-catch and increasing by-catch utilization. Interest in increased by-catch valorization may arise from a greater demand for fish products, such as the development of new markets for previously discarded species, the use of low-value specimens for aquaculture or the creation of value-added fish products for the food, pharmaceutical or cosmetic industries. However, contaminants present in fish discards may be transferred to their valorized products, leading to possible long-term bioaccumulation and subsequent adverse health effects. In this valorization framework, the aim is to promote responsible and sustainable management of marine resources. The pollutant levels in catches from European fisheries and the best available decontamination techniques for marine valorized discards/by-products are compiled and analyzed in this work.
Drying Technology | 2012
Luis T. Antelo; Stéphanie Passot; Fernanda Fonseca; Ioan Cristian Trelea; Antonio A. Alonso
Freeze drying (lyophilization) offers an attractive dehydration method for valuable food and biological products, because it is capable of preserving product quality and biological activity while extending their shelf life. However, despite these benefits in terms of product quality, freeze drying is also a notoriously energy-intensive and time-consuming process. This requires an expensive operation to construct an efficient optimal decision-making tool able to drive the operation through the most effective paths that minimize time and maximize product quality. Here we propose an integrated approach to operational design and control of the freeze-drying process that combines dynamic modeling with efficient optimized off-line and on-line control. The required mass and energy balance equations still contain inherent nonlinearity, even in their lumped parameter version. This results in a set of complex dynamic, computationally costly optimization problems solved by selected global stochastic optimization algorithms. Real-time disturbances and model uncertainties are addressed via the proposed hierarchical multilevel approach, allowing recalculation of the required control strategies. The framework developed has been revealed as a useful tool to systematically define off-line and on-line optimal operation policies for many food and biological processing units.
Marine Pollution Bulletin | 2016
Luis T. Antelo; Tatiana Ordóñez-del Pazo; Carla Lopes; Amaya Franco-Uría; Ricardo I. Pérez-Martín; Antonio A. Alonso
Organic and inorganic pollutant levels were determined for the most discarded species from trawlers operating in Great Sole and Spanish coastal fishing grounds. Results for heavy metals indicated that Cd can reach values higher than legal limits for some species and tissues, while Hg and Pb concentrations are below established values. No significant variation was noticed with fishing grounds, but both season influences in the case of Pb and interspecies variation for Hg and Cd have been detected. Valorization recommendations could be therefore established according to the levels found in the different species.
Computer-aided chemical engineering | 2010
Estefania Lopez-Quiroga; Luis T. Antelo; Antonio A. Alonso
Abstract The production of some chemicals or pharmaceuticals has been improved over the years by the development of a new concept of reactors, the reactor-heat exchangers, that overcome the classical constrains affecting many reaction units related to dissipation of heat and dilution/separation of products. The aim of this work is to propose a methodology for robust predictive control which aims at capturing the slow and most relevant, dynamics of the system. This model reduction constitutes the preliminary step to apply a real time optimization (RTO) framework for the robust control of reaction systems. The Open Plate Reactor (OPR) developed by the Swedish company Alfa Laval is used as a benchmark to validate the proposed methodology.
Revista Iberoamericana De Automatica E Informatica Industrial | 2007
Luis T. Antelo; Irene Otero-Muras; Julio R. Banga; Antonio A. Alonso
Los autores agradecen la financiacion recibida del Gobierno Espanol (Proyecto MCyT PPQ2001-3643 y DPI2004-0744-C04-03) y de la Xunta de Galicia (PGIDIT02-PXIC40209PN).
Computer-aided chemical engineering | 2006
Luis T. Antelo; Irene Otero-Muras; Julio R. Banga; Antonio A. Alonso
Abstract In this work, we apply the systematic approach to plant-wide control design presented in [1], based on the fundamentals of process networks, thermodynamics and systems theory, to the Tennessee Eastman (TE) Challenge Process, deriving robust decentralized controllers that will ensure the stability of the complete plant. We take one step further in the control design procedure by completing it with the realization of the controllers. The inventory control laws proposed are derived from a set of control of loops over the available degrees of freedom in the process.
Computers & Chemical Engineering | 2007
Luis T. Antelo; Irene Otero-Muras; Julio R. Banga; Antonio A. Alonso
Industrial & Engineering Chemistry Research | 2009
Martin Schlüter; José Egea; Luis T. Antelo; Antonio A. Alonso; Julio R. Banga