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Fluid stability in large scale ORCs using siloxanes: long-term experiences and fluid recycling

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Abstract
The results in this work show the influence of long-term operation on the decomposition of working fluids in eight different power plants (both heat-led and electricity-led) in a range of 900 kWel to 2 MWel. All case study plants are using Octamethyltrisiloxane (MDM) as a working fluid. The case study plants are between six to 12 years old. On one system detailed analyses, including the fluid distribution throughout the cycle, have been conducted. All fluid samples have been analysed via Head Space Gas Chromatography Mass Spectrometry (HS-GC-MS). Besides the siloxane composition, the influence of contaminants such as mineral oil based lubricants (and its components) has been examined. In most cases the original main working fluid has degraded to fractions of siloxanes with a lower boiling point (low-boilers) and fractions with a higher boiling point (high-boilers). As a consequence of the analyses, a new fluid management system has been designed and tested in one case study plant (case study number 8). The measures include fluid separation, cleansing and recycling. Pre-post comparisons of fluid samples have proved the effectiveness of the methods. The results show that the recovery of used working fluid offers an alternative to the purchase of fresh fluid, since operating costs can be significantly reduced. For large facilities the prices for new fluid range from e15 per litre (in 2006) to e22 per litre (in 2013), which is a large reinvestment, especially in the light of filling volumes of 4000 litres to 7000 litres per cycle. With the above mentioned method a price of e8 per litre of recovered MDM can be achieved.

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MLA
Erhart, Tobias, et al. “Fluid Stability in Large Scale ORCs Using Siloxanes: Long-Term Experiences and Fluid Recycling.” Proceedings of the 3rd International Seminar on ORC Power Systems, 2015.
APA
Erhart, T., Gölz, J., Eicker, U., & van den Broek, M. (2015). Fluid stability in large scale ORCs using siloxanes: long-term experiences and fluid recycling. Proceedings of the 3rd International Seminar on ORC Power Systems. Presented at the 3rd International Seminar on ORC Power Systems, Brussels, Belgium.
Chicago author-date
Erhart, Tobias, Jürgen Gölz, Ursula Eicker, and Martijn van den Broek. 2015. “Fluid Stability in Large Scale ORCs Using Siloxanes: Long-Term Experiences and Fluid Recycling.” In Proceedings of the 3rd International Seminar on ORC Power Systems.
Chicago author-date (all authors)
Erhart, Tobias, Jürgen Gölz, Ursula Eicker, and Martijn van den Broek. 2015. “Fluid Stability in Large Scale ORCs Using Siloxanes: Long-Term Experiences and Fluid Recycling.” In Proceedings of the 3rd International Seminar on ORC Power Systems.
Vancouver
1.
Erhart T, Gölz J, Eicker U, van den Broek M. Fluid stability in large scale ORCs using siloxanes: long-term experiences and fluid recycling. In: Proceedings of the 3rd International Seminar on ORC Power Systems. 2015.
IEEE
[1]
T. Erhart, J. Gölz, U. Eicker, and M. van den Broek, “Fluid stability in large scale ORCs using siloxanes: long-term experiences and fluid recycling,” in Proceedings of the 3rd International Seminar on ORC Power Systems, Brussels, Belgium, 2015.
@inproceedings{6952544,
  abstract     = {{The results in this work show the influence of long-term operation on the decomposition of working fluids
in eight different power plants (both heat-led and electricity-led) in a range of 900 kWel to 2 MWel. All
case study plants are using Octamethyltrisiloxane (MDM) as a working fluid. The case study plants are
between six to 12 years old. On one system detailed analyses, including the fluid distribution throughout
the cycle, have been conducted. All fluid samples have been analysed via Head Space Gas Chromatography
Mass Spectrometry (HS-GC-MS). Besides the siloxane composition, the influence of contaminants
such as mineral oil based lubricants (and its components) has been examined. In most cases the original
main working fluid has degraded to fractions of siloxanes with a lower boiling point (low-boilers)
and fractions with a higher boiling point (high-boilers). As a consequence of the analyses, a new fluid
management system has been designed and tested in one case study plant (case study number 8). The
measures include fluid separation, cleansing and recycling.
Pre-post comparisons of fluid samples have proved the effectiveness of the methods. The results show
that the recovery of used working fluid offers an alternative to the purchase of fresh fluid, since operating
costs can be significantly reduced. For large facilities the prices for new fluid range from e15 per
litre (in 2006) to e22 per litre (in 2013), which is a large reinvestment, especially in the light of filling
volumes of 4000 litres to 7000 litres per cycle. With the above mentioned method a price of e8 per litre
of recovered MDM can be achieved.}},
  author       = {{Erhart, Tobias and Gölz, Jürgen and Eicker, Ursula and van den Broek, Martijn}},
  booktitle    = {{Proceedings of the 3rd International Seminar on ORC Power Systems}},
  isbn         = {{978-2-9600059-2-9}},
  language     = {{eng}},
  location     = {{Brussels, Belgium}},
  pages        = {{10}},
  title        = {{Fluid stability in large scale ORCs using siloxanes: long-term experiences and fluid recycling}},
  url          = {{http://www.asme-orc2015.be/online/proceedings.htm}},
  year         = {{2015}},
}