Retrofit of heat exchanger networks with pressure recovery of process streams at sub-ambient conditions

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Título: Retrofit of heat exchanger networks with pressure recovery of process streams at sub-ambient conditions
Autor/es: Onishi, Viviani C. | Ravagnani, Mauro A.S.S. | Caballero, José A.
Grupo/s de investigación o GITE: Computer Optimization of Chemical Engineering Processes and Technologies (CONCEPT)
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Ingeniería Química
Palabras clave: Generalized disjunctive programming (GDP) | Mixed-integer nonlinear programming (MINLP) | Retrofit | Heat exchanger network (HEN) | Pressure recovery | Sub-ambient processes
Área/s de conocimiento: Ingeniería Química
Fecha de publicación: abr-2015
Editor: Elsevier
Cita bibliográfica: Energy Conversion and Management. 2015, 94: 377-393. doi:10.1016/j.enconman.2015.02.002
Resumen: This paper presents a new mathematical programming model for the retrofit of heat exchanger networks (HENs), wherein the pressure recovery of process streams is conducted to enhance heat integration. Particularly applied to cryogenic processes, HENs retrofit with combined heat and work integration is mainly aimed at reducing the use of expensive cold services. The proposed multi-stage superstructure allows the increment of the existing heat transfer area, as well as the use of new equipment for both heat exchange and pressure manipulation. The pressure recovery of streams is carried out simultaneously with the HEN design, such that the process conditions (streams pressure and temperature) are variables of optimization. The mathematical model is formulated using generalized disjunctive programming (GDP) and is optimized via mixed-integer nonlinear programming (MINLP), through the minimization of the retrofit total annualized cost, considering the turbine and compressor coupling with a helper motor. Three case studies are performed to assess the accuracy of the developed approach, including a real industrial example related to liquefied natural gas (LNG) production. The results show that the pressure recovery of streams is efficient for energy savings and, consequently, for decreasing the HEN retrofit total cost especially in sub-ambient processes.
Patrocinador/es: Financial support provided by the Brazilian agencies: Coordination for the Improvement of Higher Level – or Education – Personnel (process 10758/12-7) and the National Council for Scientific and Technological Development of Brazil (process 151132/2014-3), and the Spanish Ministry of Science and Innovation and Ministry of Economy and Competitiveness (Project CTQ2012-37039-C02-02) is gratefully acknowledged.
URI: http://hdl.handle.net/10045/52939
ISSN: 0196-8904 (Print) | 1879-2227 (Online)
DOI: 10.1016/j.enconman.2015.02.002
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2015 Elsevier Ltd.
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1016/j.enconman.2015.02.002
Aparece en las colecciones:INV - CONCEPT - Artículos de Revistas

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