Evaluation of Sensitivity of a Micro-CHP Unit Performance to SOFC Parameters

Kupecki, Jakub; Milewski, Jarosław; Badyda, Krzysztof

doi:10.1149/05101.0107ecst

Cited by 8 publications

(10 citation statements)

References 20 publications

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“…In such a configuration the role of a fuel processor is played by the first stack, therefore the threat of carbon formation inside the anodic compartments of the second or third stacks in series is eliminated. Depending of the fuel type and the expected system functionality, the fuel processing unit has to be adjusted to enable high electrical and overall efficiency as well eliminate the potentially dangerous issues, such as the discussed carbon formation [20]. The third aspect is the usage of the different mathematical models for describing and simulating the mechanisms and conditions required for the carbon formation and deposition process to take place.…”

Section: Co → C + Co2mentioning

confidence: 99%

Numerical model for evaluation of the effects of carbon deposition on the performance of 1 kW SOFC stack – a proposal

Motyliński

Naumovich

2017

E3S Web Conf.

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Solid oxide fuel cells are high-temperature electrochemical energy conversion devices which operate at elevated temperature (600-900°C). As a result it possible to internally reform the incoming fuel, thus except hydrogen and carbon monoxide, SOFCs can be fuelled with various hydrocarbonaceous gases. The presence of carbon-containing compounds in the fuel might result in the formation and of carbon in a form of a thin layer on the SOFC anode. The carbon deposition process depends on the thermodynamic conditions, such as temperature and steam to carbon ratio. The higher the temperature, the longer period of time is required for the solid carbon particles to deposit on the porous surface. The correlation used for this study is based on creating the ternary diagrams or Gibb's diagrams. The presented results cover a first stage of the analysis of the carbon deposition processes in SOFCs, focusing mainly on the numerical study of the changes of the fuel cell performance due to degradation of anode performance. A dedicated model of SOFC was proposed. It accounts for the diminution of the active area and/or deactivation by the increase of the resistance of the anode. The article presents the proposed methodology and the numerical approach.

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Section: Co → C + Co2mentioning

confidence: 99%

Numerical model for evaluation of the effects of carbon deposition on the performance of 1 kW SOFC stack – a proposal

Motyliński

Naumovich

2017

E3S Web Conf.

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“…Aspen HYSYS offers a comprehensive foundation for accurate calculations of the physical properties and thermodynamic and transport properties in most technological and chemical processes. Software proved to be capable of handling very advanced and complex power systems with solid oxide fuel cells [16].…”

Section: Zero-dimensional Modellingmentioning

confidence: 99%

Modelling of Physical, Chemical, and Material Properties of Solid Oxide Fuel Cells

Kupecki

2015

Journal of Chemistry

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This paper provides a review of modelling techniques applicable for system-level studies to account for physical, chemical, and material properties of solid oxide fuel cells. Functionality of 0D to 3D models is discussed and selected examples are given. Author provides information on typical length scales in evaluation of power systems with solid oxide fuel cells. In each section, proper examples of previous studies done in the field of 0D–3D modelling are recalled and discussed.

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“…There still are many problems with SOFC commercialization, and the main factors are lifespan and economics. The most important factor related to economics is system efficiency, thus several studies have been conducted to improve system efficiency [4][5][6]. Xu et al constructed a natural gas-fueled 1 kW SOFC-CHP system and investigated the impact of deterministic design parameters on system performance [4].…”

Section: Introductionmentioning

confidence: 99%

“…The most important factor related to economics is system efficiency, thus several studies have been conducted to improve system efficiency [4][5][6]. Xu et al constructed a natural gas-fueled 1 kW SOFC-CHP system and investigated the impact of deterministic design parameters on system performance [4]. It was discovered that stack voltage, system inlet fuel flow rate, and stack inlet air temperature all have a significant and non-monotonic effect on system efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of a natural gas‐fueled 1 kW solid oxide fuel cell‐combined heat and power system with off‐gas recirculation of anode and cathode

Zhu

Bai

et al. 2022

Fuel Cells

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Both anode off‐gas recirculation (AOGR) and cathode off‐gas recirculation (COGR) can increase the performance of solid oxide fuel cell‐combined heat and power (SOFC‐CHP) systems on their own, however, they both have unavoidable drawbacks. Thus, the combined effect of both on the system is worth investigating. The essential challenge is to figure out what the best AOGR and COGR ratios are under the combined situation. In this paper, the effects of varied AOGR ratios and COGR ratios on the system performance were investigated. A model of a 1 kW natural gas‐fueled SOFC‐CHP system was constructed which uses Cycle‐Tempo software. It is demonstrated that moderate AOGR can improve the net electrical efficiency, but too much AOGR will reduce the H2 concentration at the anode inlet and prevent the stack from working properly; moderate COGR can improve the thermal efficiency, but too much COGR can lead to large changes in current density variation and cause drastic changes in current, which affects the system and external electrical equipment. While, combining AOGR with COGR can improve both the net electrical and thermal efficiency, which results in higher total efficiency. As a result, the combined configuration of an AOGR ratio of 0.4 and a COGR ratio of 0.4 is recommended. In this scenario, the net electrical efficiency of the system is 47.38%, the thermal efficiency is 28.98%, the total efficiency is 76.37%, and the actual fuel utilization rate is 0.834.

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Evaluation of Sensitivity of a Micro-CHP Unit Performance to SOFC Parameters

Cited by 8 publications

References 20 publications

Numerical model for evaluation of the effects of carbon deposition on the performance of 1 kW SOFC stack – a proposal

Numerical model for evaluation of the effects of carbon deposition on the performance of 1 kW SOFC stack – a proposal

Modelling of Physical, Chemical, and Material Properties of Solid Oxide Fuel Cells

Performance analysis of a natural gas‐fueled 1 kW solid oxide fuel cell‐combined heat and power system with off‐gas recirculation of anode and cathode

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