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Lifetime development and load response of the electrical efficiency of biogas-driven cogeneration units

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  • Tappen, S.J.
  • Aschmann, V.
  • Effenberger, M.

Abstract

The electrical efficiency, ηel, of cogeneration units (CGU) is a key factor for the profitability of electricity production from biogas. We measured the electrical efficiencies of eight biogas-driven CGUs on site over long time periods. The measurements show a decrease of ηel over engine lifetime with average rates of 0.2–0.7%1 per 10,000 operating hours. The lowest rate of electrical efficiency decline was observed for an engine which was operated under a full maintenance contract, including a guarantee of electrical power output over lifetime as well as a complete overhaul. This indicates that plant owners should critically evaluate the cost-effectiveness of their strategy for CGU maintenance. For better integration of RES into the electricity market, biogas driven CGUs can be employed to provide balancing power. Thus engines have to be adapted to varying load conditions and more frequent starts and stops. Compared to full-load conditions, measured electrical efficiencies of the CGUs were 0.9–2.5% lower at 80% load and 2.7 to 5.0 %lower at 60% load. Our measurements indicate that the development of electrical efficiency with load is dependent on engine design and settings, rather than on absolute electrical power output.

Suggested Citation

  • Tappen, S.J. & Aschmann, V. & Effenberger, M., 2017. "Lifetime development and load response of the electrical efficiency of biogas-driven cogeneration units," Renewable Energy, Elsevier, vol. 114(PB), pages 857-865.
    • Handle: RePEc:eee:renene:v:114:y:2017:i:pb:p:857-865
    DOI: 10.1016/j.renene.2017.07.043
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    References listed on IDEAS

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    1. Hans-Joachim Naegele & Bernd Thomas & Christine Schrade & Andreas Lemmer & Hans Oechsner & Thomas Jungbluth, 2013. "Influence of Maintenance Intervals on Performance and Emissions of a 192 kW el Biogas Gas Otto CHP Unit and Results of Lubricating Oil Quality Tests—Outcome from a Continuous Two-Year Measuring Campai," Energies, MDPI, vol. 6(6), pages 1-21, June.
    2. Basrawi, Mohamad Firdaus Bin & Yamada, Takanobu & Nakanishi, Kimio & Katsumata, Hideaki, 2012. "Analysis of the performances of biogas-fuelled micro gas turbine cogeneration systems (MGT-CGSs) in middle- and small-scale sewage treatment plants: Comparison of performances and optimization of MGTs," Energy, Elsevier, vol. 38(1), pages 291-304.
    3. de Santoli, Livio & Lo Basso, Gianluigi & Bruschi, Daniele, 2013. "Energy characterization of CHP (combined heat and power) fuelled with hydrogen enriched natural gas blends," Energy, Elsevier, vol. 60(C), pages 13-22.
    4. Whiting, Andrew & Azapagic, Adisa, 2014. "Life cycle environmental impacts of generating electricity and heat from biogas produced by anaerobic digestion," Energy, Elsevier, vol. 70(C), pages 181-193.
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    Cited by:

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    5. Caglayan, Hasan & Caliskan, Hakan, 2021. "Advanced exergy analyses and optimization of a cogeneration system for ceramic industry by considering endogenous, exogenous, avoidable and unavoidable exergies under different environmental condition," Renewable and Sustainable Energy Reviews, Elsevier, vol. 140(C).
    6. Gianluca Caposciutti & Andrea Baccioli & Lorenzo Ferrari & Umberto Desideri, 2020. "Biogas from Anaerobic Digestion: Power Generation or Biomethane Production?," Energies, MDPI, vol. 13(3), pages 1-15, February.
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