Entwicklung, Aufbau und Betrieb eines Brennstoffzellensystems für Biogas

Heddrich, Marc P.; Jahn, Matthias; Marschallek, F.; Nake, R.; Stelter, Michael

doi:10.1002/cite.200750677

Cited by 2 publications

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“…Of the technically relevant fuel cell systems, the high temperature fuel cells exclusively come into consideration. Here, the solid oxide fuel cells (SOFC) are used, because of the high efficiency potential and the extreme flexibility in terms of fuel choice, including coal gas [6][7][8][9], biogas [10][11][12][13], landfill gas ( [14,15]), mine gas [16][17][18] and sewage gas [19,20]. Because of the decision in favor of SOFC, the next sections deal with this fuel cell type.…”

Section: Fundamentals Of Fuel Cellsmentioning

confidence: 99%

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Modelling of a solid oxide fuel cell for integrated coal gasification hybrid power plant simulation

Krüger¹

2015

Int. J. Thermo

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Now and in the mid-term future, coal remains an important energy source for electricity generation for reasons of energy supply security and economics. The expectation for low CO2-emissions and high plant efficiencies make solid oxide fuel cells an essential part of numerous innovative power plant concepts. For that reason, simplified and flexible models for solid oxide fuel cells are needed, which can be implemented easily in complex power plant system simulations. A model for a tubular solid oxide fuel cell based on a semi-empirical approach has been developed. The created model is successfully validated with operating data of demonstration plants published in literature. For the target application in a hybrid power plant with high temperature fuel cells, a parametric study of fuel gas composition, operating pressure and temperature, fuel utilization and electrical power density is presented. By means of these, the model of the fuel cell is qualified for implementation in hybrid power plants system models. Additionally, characteristic diagrams obtained by variation of the operating pressure and the fuel utilization are discussed. With the help of the diagrams, the electric and energetic performance of the SOFC over a wide range of these parameters is described by isolines for discrete values of the electrical efficiency and voltage of the fuel cell.

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Section: Fundamentals Of Fuel Cellsmentioning

confidence: 99%

“…11. Calculation of the reference voltage Uref at the calculated current density by equation A.11 derived by an approximation of the voltage-to-current density characteristic curve at the operating temperature of 1000 °C from[30] with a second-degree polynomial.…”

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confidence: 99%

Modelling of a solid oxide fuel cell for integrated coal gasification hybrid power plant simulation

Krüger¹

2015

Int. J. Thermo

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Cost Requirements for a Small-Scale SOFC Fed From Agricultural-Derived Biogas

Majerus

Lauinger

herle

2017

Journal of Electrochemical Energy Conversion and Storage

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In this work, the use of fuel cells for valorizing agricultural-derived biogas in Switzerland is studied. The Swiss agricultural case is characterized by farms with small numbers of animals (20 cows) and high feed-in tariffs (FIT) for biogas-derived electricity (0.49 CHF/kWhel). Thus, small-scale biogas installations are reviewed and the possibility to couple them with solid oxide fuel cells (SOFCs) and photovoltaic (PV) panels is analyzed. To date, less than 5% of the Swiss agricultural biogas potential is used. It is possible to increase this value significantly up to 86% through the deployment of 2 kWel engines. The small size of the Swiss farm requires biogas installations in the kW-range. Small-scale biogas facilities are not profitable yet: the main challenge is to bring down the lifetime cost of the fuel cells to 11,000 CHF/kWel (considering a lifetime of ten years) and to reduce the investment cost (IC) of small-scale biogas facilities to around 9500 CHF/kWch. In the kW-range, solid oxide fuel cells (SOFCs) have higher electrical conversion efficiencies than internal combustion engines (ICEs). It is shown that SOFCs become competitive over combustion engines if the investment cost of the former decreases below 13,000 CHF/kWel for a lifetime of 11 years. Combining the biogas facility with a PV-battery system, which covers the digester's electricity needs, is found to be beneficial. A considerable reduction in the feed-in tariffs would make small- to medium-scale biogas installations unprofitable, at current cost. In order to reach a break-even under these conditions, the investment cost of the biogas plant needs to drop below 4000 CHF/kWch, whereas the investment cost of the SOFC needs to drop below 3400 CHF/kWel.

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Entwicklung, Aufbau und Betrieb eines Brennstoffzellensystems für Biogas

Cited by 2 publications

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Modelling of a solid oxide fuel cell for integrated coal gasification hybrid power plant simulation

Modelling of a solid oxide fuel cell for integrated coal gasification hybrid power plant simulation

Cost Requirements for a Small-Scale SOFC Fed From Agricultural-Derived Biogas

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