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A stack model for MCFC system studies for process simulations
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9203-9313
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Chemical Engineering and Technology.
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(English)Manuscript (preprint) (Other academic)
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5355OAI: oai:DiVA.org:kth-5355DiVA: diva2:9583
Note

QC 20101008

Available from: 2005-08-05 Created: 2005-08-05 Last updated: 2016-06-01Bibliographically approved
In thesis
1. Modelling and experimental investigation of the porous nickel anode in the molten carbonate fuel cell
Open this publication in new window or tab >>Modelling and experimental investigation of the porous nickel anode in the molten carbonate fuel cell
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The thesis is focussed on the performance of the fuel cell and the design of the cell for operation with natural gas and renewable fuels, e.g. biogas or gasified biomass. The performance is one of the important issues for the development and commercialisation of fuel cell stacks. In order to operate fuel cell on renewable fuels, without preceding reforming of the fuel, a high temperature fuel cell is needed, i.e. a solid oxide fuel cell (SOFC) or a molten carbonate fuel cell (MCFC). At present, the latter fuel cell type is much more mature when regarding the technical aspects than is the solid oxide fuel cell. The German company MTU has up to date installed about thirty MCFC plants, mainly in Europe and the USA but also in Japan. Moreover the European Commission has decided that the use of renewable fuels must increase at the expense of fossil fuels. This decision is one step towards a smaller dependence on fossil energy sources and limited emissions of greenhouse gases.

The objective of this work is to better understand the factors that influence the cell performance: to determine the kinetic parameters of the hydrogen oxidation and the carbon monoxide oxidation and to get more information about the reaction mechanism, even when dealing with gases of low hydrogen content. The latter is of special importance when operating the cells on biogas or gasified biomass. These fuels also contain higher concentrations of carbon monoxide and carbon dioxide.

It was found that the hydrogen mechanism proposed by Jewulski and Suski describes the anode performance even at lower concentrations of hydrogen, i.e. gases corresponding to gasified biomass. Furthermore, the carbon monoxide reaction will only slightly influence the anode performance but if the rate of the shift reaction is small the influence of direct oxidation of carbon monoxide will increase. Experimental investigations have shown that mass transfer limitations in the gas phase exist. By mathematical modelling it was found that the current collector has a larger affect on the concentration gradients than the porous electrode. The concentrations gradients in the current collector are caused by the shift reaction that mainly takes place at the electrode. However, if the gas corresponds to equilibrium at the current collector the profiles will become almost uniform. Furthermore the influence of wetting properties, the pore structure and pore size distribution have also been investigated in this thesis. The outcome of this thesis may be used for electrode development and design, as well as for input to reliable cell and stack models for system simulations.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 58 p.
Series
Trita-KET, ISSN 1104-3466 ; 218
Keyword
Chemical engineering, molten carbonate fuel cell, MCFC, mechanism, cell modelling, porous electrode, Kemiteknik
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-374 (URN)91-7178-117-X (ISBN)
Public defence
2005-08-24, Sal D3, Lindstedtsvägen 5, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101008Available from: 2005-08-05 Created: 2005-08-05 Last updated: 2010-10-08Bibliographically approved
2. System studies of MCFC power plants
Open this publication in new window or tab >>System studies of MCFC power plants
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [de]

Die Brennstoffzelle ist ein elektrochemischer Reaktor und wandelt chemisch gebundene Energie direkt in elektrische Energie um. In der stationären Energieerzeugung ist der Brennstoffzellenstapel selbst nur ein kleiner Bestandteil des vollständigen Systems. Die Integration aller zusätzlichen Bestandteile, der Peripheriegeräte (Balance-of-Plant) (BoP), ist eine der Hauptaufgaben in der Studie der Brennstoffzellenkraftwerke.

Diese Untersuchung betrifft die Systemstudie des auf der Schmelz-Karbonat-Brennstoffzelle (MCFC) basierten Kraftwerks. Die Systemstudie ist mit dem Simulationprogramm Aspen PlusTM durchgeführt worden.

Artikel I beschreibt die Implementierung eines in Aspen PlusTM entwickelten MCFC Stapelmodells, um ein MCFC Kraftwerk zu studieren, das Erdgas als Brennstoff verwendet.

Artikel II beschreibt, wie unterschiedliche Prozeßparameter, wie Brenngasnutzung und dieWahl des Brennstoffes, die Leistung eines MCFC Kraftwerks

Abstract [en]

A fuel cell is an electrochemical reactor, directly converting chemically bound energy to electrical energy. In stationary power production the fuel cell stack itself is only a small component of the whole system. The integration of all the auxiliary components, the Balance-of-Plant (BoP), is one of the main issues in the study of fuel cell power plants.

This thesis concerns the systems studies of molten carbonate fuel cell (MCFC) based power plants. The system studies has been performed with the simulation software Aspen PlusTM.

Paper I describes on the implementation of a developed MCFC stack model into Aspen PlusTM in order to study an MCFC power plant fueled with natural gas.

Paper II describes how different process parameters, such as fuel cell fuel utilization, influence the performance of an MCFC power plant.

Abstract [sv]

Bränslecellen är en elektrokemisk reaktor som kan direkt omvandla kemiskt bunden energi till elektrisk energi. I stationär kraftproduktion är själva bränslecellsstapeln endast en mindre komponent i systemet. Integrationen av kringutrustningen, den s.k. Balance-of-Plant (BoP), som tex. pumpar, kompressorer och värmeväxlare är en av huvudfrågeställningarna i studierna av bränslecellskraftverk. Denna avhandling avser systemstudier av mältkarbonatbränslecellsbaserade (MCFC) kraftverk. Systemstudierna har utförts med processimuleringprogramet Aspen PlusTM.

Artikel I beskriver en utvecklad MCFC-cellmodell, som implementeras som "user model" i Aspen Plus, för att studera ett naturgasbaserat bränslecellskraftverk.

Artikel II beskriver hur olika processparametrar, som tex bränsleutnyttjande och val av bränsle, påverkar ett MCFC-kraftverks prestanda.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 88 p.
Series
Trita-KET, ISSN 1104-3466 ; R-213
Keyword
Fuel cells, fuel cell systems, system studies, process simulation, molten carbonate, Brennstoffzellen, Brennstoffzellensystem, Systemanalyse, Prozeßsimulation, Bränsleceller, bränslecellssystem, systemstudier, processimulering, smältkarbonatbränslecell
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-419 (URN)
Presentation
2005-09-23, Seminarierum 591, Teknikringen 42, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101129Available from: 2005-09-15 Created: 2005-09-15 Last updated: 2010-11-29Bibliographically approved

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Lindbergh, Göran

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