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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 Campaign

Author

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  • Hans-Joachim Naegele

    (State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, Garbenstrasse 9, Stuttgart 70599, Germany)

  • Bernd Thomas

    (Reutlingen Research Institute (RRI), Reutlingen University, Alteburgstrasse 150, Reutlingen 72762, Germany)

  • Christine Schrade

    (Reutlingen Research Institute (RRI), Reutlingen University, Alteburgstrasse 150, Reutlingen 72762, Germany)

  • Andreas Lemmer

    (State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, Garbenstrasse 9, Stuttgart 70599, Germany)

  • Hans Oechsner

    (State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, Garbenstrasse 9, Stuttgart 70599, Germany)

  • Thomas Jungbluth

    (State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, Garbenstrasse 9, Stuttgart 70599, Germany)

Abstract

In the present work, we focus on long-term and permanent measurements of approximately two years on a 192 kW el Gas Otto CHP (combined heat and power) unit at a full-scale research biogas plant. In detail the influence of 600 h and 1800 h maintenance intervals on electrical efficiency consumption and exhaust gas emissions such as NO x and CO have been studied under real life conditions. Lubricating oil quality analyses throughout the CHP operation time are presented to show the destructive changes in property and its influence on condition based maintenance. The results confirm the well-known fact that after readjustment of the air-fuel ratio after 1800 h maintenance the emission values for NO x decline while CO increases. The emission-optimized operation mode leads to lower engine efficiency. The maintenance tasks carried out at 600 h intervals lead to lower NO x emissions in nine cases while in 14 cases the emissions remained unchanged. The permanent measurements proved their legitimacy showing various emission deviations from the limiting values prior and post maintenance. The results show that by monitoring the lubricating oil quality, the oil change intervals can be maximized while ensuring that engine performance is not endangered, and a longer engine lifespan can be expected. The oil analyses allow the operator to reduce maintenance expenditures while minimizing wear.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:6:p:2819-2839:d:26331
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    References listed on IDEAS

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    1. Westner, Günther & Madlener, Reinhard, 2010. "The benefit of regional diversification of cogeneration investments in Europe: A mean-variance portfolio analysis," Energy Policy, Elsevier, vol. 38(12), pages 7911-7920, December.
    2. Kazemi-Beydokhti, Amin & Zeinali Heris, Saeed, 2012. "Thermal optimization of combined heat and power (CHP) systems using nanofluids," Energy, Elsevier, vol. 44(1), pages 241-247.
    3. Hinnells, Mark, 2008. "Combined heat and power in industry and buildings," Energy Policy, Elsevier, vol. 36(12), pages 4522-4526, December.
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    1. 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.
    2. Steinhorst, Martin Philipp & Empl, Johannes-Baptist & Bahrs, Enno, 2014. "Interdependenzen Zwischen Risikoeinstellungen Und Entscheidungen In Der Planung Sowie Im Betrieb Von Biogasanlagen," 54th Annual Conference, Goettingen, Germany, September 17-19, 2014 187894, German Association of Agricultural Economists (GEWISOLA).
    3. Steinhorst, M.P. & Empl, J.-B. & Bahrs, E., 2015. "Interdependenzen zwischen Risikoeinstellungen und Entscheidungen in der Planung sowie im Betrieb von Biogasanlagen," Proceedings “Schriften der Gesellschaft für Wirtschafts- und Sozialwissenschaften des Landbaues e.V.”, German Association of Agricultural Economists (GEWISOLA), vol. 50, March.

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