Modelado, análisis y control dinámico de un reformador de etanol en tres etapas para aplicaciones en pilas de combustible

dc.contributor
Universitat Politècnica de Catalunya. Institut d'Organització i Control de Sistemes Industrials
dc.contributor.author
Garcia, Vanesa M.
dc.date.accessioned
2013-11-18T10:12:52Z
dc.date.available
2013-11-18T10:12:52Z
dc.date.issued
2012-04-16
dc.identifier.uri
http://hdl.handle.net/10803/125532
dc.description.abstract
This thesis presents results related to the design, modeling and control of a low temperature ethanol reformer as a source of hydrogen designed to feed a fuel cell (PEMFC). As fuel, ethanol has been selected as one of the renewable energy sources currently under study due to its interest for scientific and economic fields. The reformer has been separated into three stages in order to guarantee the maximum production of H2 and the minimum production of CO. SnO2 and Co(Fe)Na+/ZnO catalytic monoliths have been used, where in the first stage ethanol is dehydrogenated over SnO2 and, in the second stage, the reforming of acetaldehyde over Co(Fe)Na+/ZnO takes place under the presence of hydrogen, generated in stage 1. Then we add a third stage with a Fe2O3-Cr2O3 commercial catalyst to complete the WGS reaction. In addition to ensure a reducing environment in the reforming step, this configuration also allows optimizing the conditions of each stage of the reaction. Constant pressure has been imposed as a condition of the reformer design, but the variation of temperatures in each stage has been considered. In this thesis dynamic models have been developed for the reformer of ethanol with vapour at low temperatures described previously, the stationary and dynamic response has been analysed and controllers have been designed to meet the requirements of the system. Up until now there have only been a few works that address the design and implementation of controllers for fuel reformers, and none of these have used ethanol fuel. Some are in the area of automatic control and have been applied to tubular reformers but consider other type of fuel, not ethanol, for its alimentation In this thesis the mathematical model used to represent the state of the monolithic reformer has been presented, considered and implemented. Through a study of the stationary state one can validate the different hypothesis of assumed design and through an analysis of the parametric sensitivity the operational conditions for the reform process are discussed. This way the mathematic model of the reactor can be used to explore other alternatives for the operation of the reformer putting an emphasis on the influence of temperature in the second stage as this is a variable. Afterwards a study is made of the control of the models based on the balance of mass and linearised energy. In order to realise the control study the mathematic tools RGA, MRI and CN have been used. Through this analysis the control structures have been selected which will be most suitable for design controllers which can guarantee the requirements for the fuel cell.
dc.format.extent
182 p.
dc.format.mimetype
application/pdf
dc.language.iso
spa
dc.publisher
Universitat Politècnica de Catalunya
dc.rights.license
ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs.
dc.source
TDX (Tesis Doctorals en Xarxa)
dc.subject
Etanol
dc.subject
Control de reformadores
dc.subject
Modelo dinámico
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Controlabilidad
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Sensibilidad paramétrica
dc.title
Modelado, análisis y control dinámico de un reformador de etanol en tres etapas para aplicaciones en pilas de combustible
dc.type
info:eu-repo/semantics/doctoralThesis
dc.type
info:eu-repo/semantics/publishedVersion
dc.subject.udc
66
dc.contributor.director
Llorca, Jordi, 1966-
dc.contributor.codirector
Serra, Maria (Serra Prat)
dc.embargo.terms
cap
dc.rights.accessLevel
info:eu-repo/semantics/openAccess
dc.identifier.dl
B. 29576-2013


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