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

Hans-Joachim Naegele, Bernd Thomas, Christine Schrade, Andreas Lemmer, Hans Oechsner and Thomas Jungbluth
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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

Energies, 2013, vol. 6, issue 6, 1-21

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.

Keywords: CHP (combined heat and power) unit; emissions; maintenance intervals; part load; lubricating oil quality; oil change intervals (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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