Coupled Physics Performance Predictions and Risk Assessment for Dry Gas Seal Operating in MW-Scale Supercritical CO2 Turbine

Thatte, Azam; Dheeradhada, Voramon S.

doi:10.1115/gt2016-57670

Cited by 13 publications

(17 citation statements)

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“…Hence, the increase of the spiral angle increases the opening force. Similar observations are mentioned in [11].…”

Section: Opening Forcesupporting

confidence: 77%

“…The supercritical CO2 closed loop Brayton cycle critically relies on seal technologies to achieve high system efficiencies [11]. The seal is required to separate and create barriers between the high-pressure fluid in turbine and compressor and the ambient condition or lowpressure regions that exist to minimize windage.…”

Section: Greek Symbolsmentioning

confidence: 99%

“…Thatte and Dheeradhada [11] performed the coupled physics performance predictions and risk assessment for dry gas seal operating in the MW-scale supercritical CO2 turbine. The models incorporated a real gas equation of state to capture the nonlinearities and discontinuities of fluid and thermal properties neat the critical point.…”

Section: Conjugate Heat Transfer Simulation Of Dry Gas Sealmentioning

confidence: 99%

“…Because of the groove is not machined across the entire face of the rotating ring, the stationary and rotating ring are in tight contact. (a) (b) Figure 1.8: Dry gas seal operation, (a) The cut view in the dry gas seal cartridge [22] and (b) the dry gas seal components and leakage path [11].…”

Section: Principle Operationsmentioning

confidence: 99%

“…System control and transient analysis of supercritical CO2 loop has been the primary focus at Argonne National Laboratory (ANL), specifically for sodium-cooled reactors and Lead Fast Reactors [25,30,[36][37][38][39]. The turbo-expander and heat exchanger development has been a large focus at the Southwest Research Institute for supercritical CO2 for solar energy applications [11]. At the University of Queensland 100kW thermal laboratory-scale test loop within Queensland Geothermal Energy Centre of Excellence (QGECE) the primary project has been focusing on radial turbine performance characterization and prototype system testing.…”

Section: IVmentioning

confidence: 99%

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Simulation and development of dry gas seal for supercritical CO2 carbon dioxide

Zakariya¹

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The supercritical CO 2 closed loop Brayton cycle operates at high pressure to achieve higher energy conversion efficiency. One of the important components in turbomachinery of the power cycle plant is the dry gas seals. Dry gas seals are gas-lubricated, mechanical, non-contacting, end-face seals, consisting of a mating (rotating) ring and a primary (stationary) ring. Low leakage dry gas seals are considered as a key enabling technology for achieving the improved thermodynamic cycle efficiency in the supercritical CO 2 power cycle. Alternate seal types, for example, labyrinth seals, suffers from high leakage. Even so there is a growing interest and importance of applying the small length scale dry gas seal in the small to medium scale supercritical closed loop Brayton cycle (1-20 MWe), there are still uncertainties for their operation at supercritical CO 2 conditions. These include the real gas effects near the critical points and the methods of minimizing the deformation of the supercritical CO 2 dry gas seal. In the supercritical region in the vicinity of the critical point (304 K, 7.4 MPa), CO 2 behaves as a real-gas, exhibiting significant and abrupt nonlinear changes in fluid and transport properties and high densities.Comprehensive analysis is performed to simulate the supercritical CO 2 dry gas seal. First, an isothermal simulation assuming rigid sealing ring walls in the gas film is performed using ANSYS Fluent to study the influences of real gas effect on performances of the dry gas seal. Then, conjugate heat transfer simulation is used to optimize the face geometry for a small to median scale supercritical closed loop Brayton cycle (1-20 MWe) using ANSYS Fluent. Finally, the pressure and the thermal outputs from the conjugate heat transfer analysis are used as boundary conditions for one way coupling fluid-structurethermal simulations using ANSYS Static Structural to study the effect of deformation of the sealing rings under applied pressure-loads, thermal-loads, and centrifugal effect.Finding from the simulation results shows, close to critical point the real gas effect is significant, whereas far from the critical point the supercritical fluid resembles an ideal gas. The centrifugal effect is enhanced by the higher density due to the real gas effects, causing a reduction of average pressure in the dam region hence reduces the opening force, and seal leakage.Increasing the groove radius decreases the opening force whereas increasing the spiral angle, increases the opening force. However, the variation is small for all tested cases studies with variation up to 6%. Increasing the groove radius decreases the leakage rate whereas increasing the spiral angle, increases the leakage rate. The variation in changing groove radius is more significant than the spiral angles. The variation in leakage iii is up to 29.2% for all tested cases. In term of the film stiffness, there is no clear pattern when changing the groove radius but the impact of the spiral angle is significant, up to 46.6% for all tested c...

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“…Hence, the increase of the spiral angle increases the opening force. Similar observations are mentioned in [11].…”

Section: Opening Forcesupporting

confidence: 77%

Section: Greek Symbolsmentioning

confidence: 99%

Section: Conjugate Heat Transfer Simulation Of Dry Gas Sealmentioning

confidence: 99%

Section: Principle Operationsmentioning

confidence: 99%

Section: IVmentioning

confidence: 99%

See 3 more Smart Citations

Simulation and development of dry gas seal for supercritical CO2 carbon dioxide

Zakariya¹

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The influence and a direct judgement method of the flow state in supercritical CO2 dry gas seal

Zhang

Jiang

Peng

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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Review of supercritical carbon dioxide (sCO2) technologies for high-grade waste heat to power conversion

2020

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In the European Industry, 275 TWh of thermal energy is rejected into the environment at temperatures beyond 300 °C. To recover some of this wasted energy, bottoming thermodynamic cycles using supercritical carbon dioxide (sCO 2) as working fluid are a promising technology for the conversion of the waste heat into power. CO 2 is a non-flammable and thermally stable compound, and due to its favourable thermo-physical properties in the supercritical state, can lead to high cycle efficiencies and a substantial reduction in size compared to alternative heat to power conversion technologies. In this work, a brief overview of the sCO 2 power cycle technology is presented. The main concepts behind this technology are highlighted, including key technological challenges with the major components such as turbomachinery and heat exchangers. The discussion focuses on heat to power conversion applications and benefits of the experience gained from the design and construction of a 50 kWe sCO 2 test facility at Brunel University London. A comparison between sCO 2 power cycles and conventional heat to power conversion systems is also provided. In particular, the operating ranges of sCO 2 and other heat to power systems are reported as a function of the waste heat source temperature and available thermal power. The resulting map provides insights for the preliminary selection of the most suitable heat to power conversion technology for a given industrial waste heat stream.

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Coupled Physics Performance Predictions and Risk Assessment for Dry Gas Seal Operating in MW-Scale Supercritical CO2 Turbine

Cited by 13 publications

References 0 publications

Simulation and development of dry gas seal for supercritical CO2 carbon dioxide

Simulation and development of dry gas seal for supercritical CO2 carbon dioxide

The influence and a direct judgement method of the flow state in supercritical CO2 dry gas seal

Review of supercritical carbon dioxide (sCO2) technologies for high-grade waste heat to power conversion

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