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Simulation of Load Cycles in Pressurized SOFC Systems and Economic Evaluation

Leucht, Florian and Kallo, Josef and Bessler, Wolfgang G. and Friedrich, K. Andreas (2010) Simulation of Load Cycles in Pressurized SOFC Systems and Economic Evaluation. 7th Symposium on Fuel Cell Modelling and Experimental Validation, 23.-24. März 2010, Lausanne, Schweiz.

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Abstract

As known from literature [1], the pressurization of SOFC systems may lead to increased efficiencies and higher power output. These benefits will have to be utilized in future power generation in order to meet the requirements of higher electrical power demand as well as the goals of lower emissions. Operating a hybrid power plant at full load only is not always an option. Small power plants have to be able to run in load-following mode in order to keep the load of the grid low. By alternating the power of the gas turbine, a hybrid power plant would only be capable of following load in a band of 100 to 80%. Therefore, load alternation of the SOFC system is crucial for the operation of a hybrid power plant. The model of an SOFC system in a hybrid power plant has been presented before [2]. In this presentation we focus on the load-following capability of the modelled SOFC system. A series of step responses in load demand was applied to the system model, giving a close insight into the systems dynamic capabilities. These step responses will be discussed in detail and rules for dynamic system operation will be developed from these simulations. These rules have to be applied in order to keep the system within safe operation boundaries. Further complete load cycle simulations will be presented based on typical household load demands showing the dynamic capability of the pressurized fuel cell system. The prospects of pressurized SOFC systems in stationary power generation will be discussed on the basis of economical considerations. The operation of the SOFC at full load operation as well as at dynamic load conditions will be considered. 1. Virkar, The effect of pressure on solid oxide fuel cell performance. 1997, Westinghouse Electric Corporation, University of Utah, Department of Material's Science and Engineering. 2. F. Leucht and K. A. Friedrich, "SOFC System Modelling in the Hybrid Power Plant Project," in Proceedings of the 6th Symposium on Fuel Cell Modelling and Experimental Validation, Bad Herrenalb (Germany) (2009).

Item URL in elib:https://elib.dlr.de/65142/
Document Type:Conference or Workshop Item (Speech)
Title:Simulation of Load Cycles in Pressurized SOFC Systems and Economic Evaluation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Leucht, FlorianDLR TT ECEUNSPECIFIED
Kallo, JosefDLR TT ECEUNSPECIFIED
Bessler, Wolfgang G.DLR TTUNSPECIFIED
Friedrich, K. AndreasDLR TTUNSPECIFIED
Date:23 March 2010
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Hybridkraftwerk, SOFC System, Lastfolge, Ökonomische Modellierung
Event Title:7th Symposium on Fuel Cell Modelling and Experimental Validation
Event Location:Lausanne, Schweiz
Event Type:international Conference
Event Dates:23.-24. März 2010
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old), E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells, E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Hybridkraftwerke (old), E - Brennstoffe (old), E - Hochtemperatur-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Leucht, Florian
Deposited On:06 Oct 2010 13:19
Last Modified:06 Oct 2010 13:19

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