Finite-volume modeling and hybrid-cycle performance of planar and tubular solid oxide fuel cells

Stiller, Christoph; Thorud, Bjo̸rn; Seljebø, Steinar; Mathisen, Øistein; Karoliussen, Håvard; Bolland, Olav

doi:10.1016/j.jpowsour.2004.09.019

Cited by 111 publications

(55 citation statements)

References 3 publications

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“…In cases where the oxidizer pressure increases faster than the anode compartment pressure backflow may be a problem. This type of constraint lowered the system response of the hybrid system presented in Stiller et al [4], which was further described in Stiller et al [5].…”

Section: Introductionmentioning

confidence: 86%

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On control concepts to prevent fuel starvation in solid oxide fuel cells

Gaynor

Mueller

Jabbari

et al. 2008

Journal of Power Sources

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Several methods to prevent fuel starvation in solid oxide fuel cells are developed and investigated. Fuel starvation can occur during transients, if fuel is consumed in the fuel cell faster than it can be supplied by the fuel processing and delivery system. It is demonstrated through simulation that fuel depletion can occur in the fuel cell if no corrective action is employed. Fuel starvation can be prevented by the use of rate limiters, reference governors, and modifications to the fuel-flow controller. The various methods to prevent fuel depletion within the fuel cell are developed and compared. Analysis indicates that reference governors can avoid hydrogen depletion with much less of an impact on transient load following capability than rate limiters. Hence, various reference governors ranging in level of fidelity were developed and compared for performance. It was further demonstrated that with knowledge of the fuel preprocessor response, it is possible to manipulate the fuel flow to minimize reformer flow dynamics, minimizing the need to govern the fuel cell transient capability.

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Section: Introductionmentioning

confidence: 86%

“…A general method for controlling fuel cell systems has been identified in the literature [4,14,22], where the airflow rate is used to control the fuel cell temperature, the fuel flow rate is used to control the utilization, and the current is used to control the power. Fig.…”

Section: Fuel Cell System Controlsmentioning

confidence: 99%

On control concepts to prevent fuel starvation in solid oxide fuel cells

Gaynor

Mueller

Jabbari

et al. 2008

Journal of Power Sources

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“…For use in large-scale systems such as energy systems solid oxide fuel cells are considered promising, partly because of their relatively high efficiency, and partly because of their ability to utilize more than one type of fuel [24]. For such fuel cells 60% power efficiency is considered possible when using hydrogen [25][26][27], though some studies show, that the efficiency may be higher when using other types of fuel [28] or when combining the fuel cells with gas turbines [29,30].…”

Section: Efficiencies Used In the Alternativesmentioning

confidence: 99%

Fuel-efficiency of hydrogen and heat storage technologies for integration of fluctuating renewable energy sources

Mathiesen

Lund

2005

2005 IEEE Russia Power Tech

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General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.? Users may download and print one copy of any publication from the public portal for the purpose of private study or research. ? You may not further distribute the material or use it for any profit-making activity or commercial gain ? You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access to the work immediately and investigate your claim. Abstract -This paper presents the methodology and results of analysing the use of different energy storage technologies in the task of integration of fluctuating renewable energy sources (RES) into the electricity supply. The analysis is done on the complete electricity system including renewable energy sources as well as power plants and CHP (Combined heat and power production). Emphasis is put on the need for ancillary services. Devices to store electricity as well as devices to store heat can be used to help the integration of fluctuating sources. Electricity storage technologies can be used to relocate electricity production directly from the sources, while heat storage devices can be used to relocate the electricity production from CHP plants and hereby improve the ability to integrate RES. The analyses are done by advanced computer modelling and the results are given as diagrams showing the system ability to integrate RES inputs between 0 and 100 percent of the electricity demand.

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“…Hereinafter, the reaction equations and the functionality of SOFC are shown again (Kurzweil, 2013;Singhal, 2013 Figure 1: Operating principle of a solid oxide fuel cell SOFC are available in two different designs, which have mutually different advantages and disadvantages. The specific differences of the tubular and planar structure are adequately described in the literature and are not considered at this point (Sammes, et al, 2005;Stiller, et al, 2005;Singhal, 2013;Zhou, et al, 2008). The present work is based on the combination of small MGT and planar SOFC.…”

Section: Introductionmentioning

confidence: 99%

“…It has often been shown in the literature (e. g. Zhou, et al, 2008;Stiller, et al, 2005;Calisea, et al, 2006;Sadegh Motahar, 2009) that MGT-SOFC systems have a great potential for a highly effective process. Particularly interesting are the remarks by Mueller et al (2008).…”

Section: Introductionmentioning

confidence: 99%

Micro Turbo-Fuel-Cell-Technology

Berg

Dückershoff²,

Lehmann

et al. 2017

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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The improvement of decentralised energy supply systems has received an important role in the recent years. One option is the combination of SOFC with recuperated MGT. Here, a new strategy for selecting the system parameters, such as the operating temperature of the SOFC, turbine inlet temperature and the pressure ratio of the hybrid system, is presented. By introducing the heat ratio between the heat required to increase the process gas to the SOFC operating temperature and the heat required to raise the SOCF exhaust gas to the TIT, it was found that high efficiency (approx. 68%) is realisable in a compact hybrid system today. Analysis also shows that the HEX-technology is needed to improve the system effectiveness. Also, high recirculation rates with lower TIT can be considered as the future development direction. In addition, a sample configuration of an oil-free MGT rotor unit with high speed foil bearings is presented.

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Finite-volume modeling and hybrid-cycle performance of planar and tubular solid oxide fuel cells

Cited by 111 publications

References 3 publications

On control concepts to prevent fuel starvation in solid oxide fuel cells

On control concepts to prevent fuel starvation in solid oxide fuel cells

Fuel-efficiency of hydrogen and heat storage technologies for integration of fluctuating renewable energy sources

Micro Turbo-Fuel-Cell-Technology

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