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Techno-Economic Study of a Biogas-Based Polygeneration Plant for Small Dairy Farms in Central Bolivia
KTH Royal Institute of Technology, Sweden;Universidad Mayor de San Simón (UMSS), Bolivia.
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.ORCID iD: 0000-0003-0189-474x
Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), Spain.
KTH Royal institute of technology, Sweden.
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2020 (English)In: Renewable Energy and Sustainable Buildings: Selected Papers from the World Renewable Energy Congress WREC 2018 / [ed] Sayigh A, Springer, 2020, p. 675-687Chapter in book (Refereed)
Abstract [en]

This paper presents a techno-economic feasibility study of a polygeneration plant proposed for an association of dairy farmers in Bolivia. The systems have been designed in an integrated approach and are based on the resource recovery utilizing available cow dung. The production of biogas is proposed using “low cost” tubular digesters. The biogas is used for the production of electricity and heat in a 40 kWel internal combustion engine. Heat from the exhaust gas is recovered to drive an absorption cooling system for milk refrigeration and for a bio-slurry drying system. The final services are biogas, electricity, cooling and fertilizers. The techno-economic analysis focuses on determining the levelized cost of the services and compare them with the subsidized and non-subsidized prices of other competitive services in the market. Sensitivity analyses for the services prices are carried out to see the influence of the feedstock handling cost and the subsidies on investment capital. Once the selling prices of the services are defined, the payback period of investment capital is determined. The results show that the biogas and electricity costs were found lower than the subsidized prices of similar services in the market while the cost of cooling was found slightly higher. From the sensitivity analysis we have that the feedstock handling cost can be increased from 10 to 18 USD/ton while maintaining the biogas price below the subsidized LPG price, and applying subsidies to the investment capital allows reducing the rest of the services costs. The payback period is around 3.5 years when a subsidy of 15% is applied in the investment capital and the services are sold at the subsidized prices of the conventional services. Our study has shown that under the conditions of the Bolivian market it is feasible the installation of a polygeneration plant. On the other hand, a market without or with reduced subsidies for the conventional services makes the proposed system more feasible and competitive.

Place, publisher, year, edition, pages
Springer, 2020. p. 675-687
Series
Innovative Renewable Energy, ISSN 2522-8927, E-ISSN 2522-8935
National Category
Energy Systems
Research subject
Humanities, English Education
Identifiers
URN: urn:nbn:se:lnu:diva-90448DOI: 10.1007/978-3-030-18488-9_54ISBN: 978-3-030-18487-2 (print)ISBN: 978-3-030-18488-9 (electronic)OAI: oai:DiVA.org:lnu-90448DiVA, id: diva2:1376640
Available from: 2019-12-09 Created: 2019-12-09 Last updated: 2019-12-18Bibliographically approved

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Mainali, Brijesh

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