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Improving the Economic Feasibility of Small-Scale Biogas-Solid Oxide Fuel Cell Energy Systems through a Local Ugandan Biochar Production Method

Author

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  • Henry Wasajja

    (Water Management Department, Sanitary Engineering Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
    Department of Electrical Engineering, Faculty of Engineering, Ndejje University, Kampala P.O. Box 7088, Uganda)

  • Vipin Champatan

    (Centre of Excellence in Systems, Energy and Environment, APJ Abdul Kalam Technological University, Kannur 670563, Kerala, India)

  • Rob Verhorst

    (Water Management Department, Sanitary Engineering Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands)

  • Ralph E. F. Lindeboom

    (Water Management Department, Sanitary Engineering Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands)

  • Jules B. van Lier

    (Water Management Department, Sanitary Engineering Section, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands)

  • Purushothaman V. Aravind

    (Energy and Sustainability Research Institute Groningen, Faculty of Science and Engineering, University of Groningen, Nijenborgh 6, 9747 AG Groningen, The Netherlands)

Abstract

A small-scale (up to 5 kWe) biogas-solid oxide fuel cell (SOFC) energy system is an envisioned system, which can be used to meet both electrical and thermal energy demand of off-grid settlements. SOFC systems are reported to be more efficient than alternatives like internal combustion engines (ICE). In addition to energy recovery, implementation of biogas-SOFC systems can enhance sanitation among these settlements. However, the capital investment costs and the operation and maintenance costs of a biogas-SOFC energy system are currently higher than the existing alternatives. From previous works, H 2 S removal by biochar was proposed as a potential local cost-effective alternative. This research demonstrates the techno-economic potential of locally produced biochars made from cow manure, jackfruit leaves, and jack fruit branches in rural Uganda for purifying the biogas prior to SOFC use. Results revealed that the use of biochar from cow manure and jack fruit leaves can reduce H 2 S to below the desired 1 ppm and substitute alternative biogas treatments like activated carbon. These experimental results were then translated to demonstrate how this biochar would improve the economic feasibility for the implementation of biogas-SOFC systems. It is likely that the operation and maintenance cost of a biogas-SOFC energy system can in the long run be reduced by over 80%. Also, the use of internal reforming as opposed to external reforming can greatly reduce the system capital cost by over 25% and hence further increase the chances of system economic feasibility. By applying the proposed cost reduction strategies coupled with subsidies such as tax reduction or exemption, the biogas-SOFC energy system could become economically competitive with the already existing technologies for off-grid electricity generation, like solar photovoltaic systems.

Suggested Citation

  • Henry Wasajja & Vipin Champatan & Rob Verhorst & Ralph E. F. Lindeboom & Jules B. van Lier & Purushothaman V. Aravind, 2024. "Improving the Economic Feasibility of Small-Scale Biogas-Solid Oxide Fuel Cell Energy Systems through a Local Ugandan Biochar Production Method," Energies, MDPI, vol. 17(17), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4416-:d:1470415
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    References listed on IDEAS

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    1. Giarola, Sara & Forte, Ornella & Lanzini, Andrea & Gandiglio, Marta & Santarelli, Massimo & Hawkes, Adam, 2018. "Techno-economic assessment of biogas-fed solid oxide fuel cell combined heat and power system at industrial scale," Applied Energy, Elsevier, vol. 211(C), pages 689-704.
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