Performance of supercritical CO2 dry gas seals near the critical point

Zakariya, Mohd Fairuz and Jahn, Ingo H. J. (2016). Performance of supercritical CO2 dry gas seals near the critical point. In: Proceedings of ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. ASME Turbo Expo 2016, Seoul, South Korea, (56537.1-56537.10). June 13-17, 2016. doi:10.1115/GT2016-56537


Author Zakariya, Mohd Fairuz
Jahn, Ingo H. J.
Title of paper Performance of supercritical CO2 dry gas seals near the critical point
Formatted title
Performance of supercritical CO2 dry gas seals near the critical point
Conference name ASME Turbo Expo 2016
Conference location Seoul, South Korea
Conference dates June 13-17, 2016
Convener International Gas Turbine Institute
Proceedings title Proceedings of ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
Journal name Proceedings of the ASME Turbo Expo
Place of Publication New York, NY, United States
Publisher American Society of Mechanical Engineers (ASME)
Publication Year 2016
Sub-type Fully published paper
DOI 10.1115/GT2016-56537
Open Access Status Not yet assessed
ISBN 9780791849873
Volume 9
Start page 56537.1
End page 56537.10
Total pages 10
Language eng
Formatted Abstract/Summary
The Queensland Geothermal Energy Centre of Excellence is investigating the use of supercritical CO2 closed loop Brayton cycles in the Concentrated Solar Thermal power cycle plant. One of the important components in the turbomachinery within the plant are seals. As the cycle is closed loop and operating at high pressures, dry gas seals have been recommended for future use in these systems. One of the main challenges of using supercritical CO2 dry gas seals is that operating conditions are near the critical point. In the supercritical region in the vicinity of the critical point (304 K, 7.4 MPa), CO2 behaves as a real-gas, exhibiting large and abrupt non-linear changes in fluid and transport properties and high densities. To correctly predict the seal operation and performance, the interaction between this real gas and the seal rotor (primary ring) and the seal stator (mating ring) need to analysed and investigated in detail, as they can lead to significant changes in flow and seal performance. Results from this paper show that increased centrifugal effects caused by higher gas densities can reduce the pressure in the sealing dam region. This adversely affects the loading capacity of the dry gas seal. However, it also benefits seal performances by reducing the leakage rate. The current work presents an investigation of the supercritical CO2 dry gas seals operating close to the critical point with an inlet pressure and temperature of 8.5Mpa and 370K respectively and a speed of 30000 RPM. Results highlighting the effects of the groove length or dam to groove ratio on the performance of the dry gas seal are presented. The seal is simulated using Computational Fluid Dynamics to study the flow behaviour of the supercitical CO2 in the dry gas seal. Supercritical CO2 fluid properties are based on the fluid database REFPROP. The numerical model was validated with previous work and good agreement was demonstrated.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Mechanical & Mining Engineering Publications
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Created: Fri, 14 Oct 2016, 19:44:41 EST by Ingo Jahn on behalf of School of Mechanical and Mining Engineering