Optimization of Organic Rankine Cycles for Off-Shore Applications
In off-shore oil and gas platform efficiency, the reliability and fuel flexibility are the major concerns when selecting the gas turbine to support the electrical and mechanical demand on the platform. In order to fulfill these requirements, turbine inlet temperature and pressure ratio are not incre...
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ftdtupubl:oai:pure.atira.dk:publications/f34862f4-8db3-43dd-830a-4e2a82bda0e8 2024-09-15T18:26:50+00:00 Optimization of Organic Rankine Cycles for Off-Shore Applications Pierobon, Leonardo Larsen, Ulrik Nguyen, Tuong-Van Haglind, Fredrik 2013 https://orbit.dtu.dk/en/publications/f34862f4-8db3-43dd-830a-4e2a82bda0e8 eng eng The American Society of Mechanical Engineers (ASME) https://orbit.dtu.dk/en/publications/f34862f4-8db3-43dd-830a-4e2a82bda0e8 urn:ISBN:978-0-7918-5520-1 info:eu-repo/semantics/closedAccess Pierobon , L , Larsen , U , Nguyen , T-V & Haglind , F 2013 , Optimization of Organic Rankine Cycles for Off-Shore Applications . in Proceedings of ASME Turbo Expo 2013 . vol. 5B , The American Society of Mechanical Engineers (ASME) , ASME Turbo Expo 2013 , San Antonio, TX , United States , 03/06/2013 . /dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being contributionToPeriodical 2013 ftdtupubl 2024-07-22T23:50:05Z In off-shore oil and gas platform efficiency, the reliability and fuel flexibility are the major concerns when selecting the gas turbine to support the electrical and mechanical demand on the platform. In order to fulfill these requirements, turbine inlet temperature and pressure ratio are not increased up to the optimal values and one or more redundant gas turbines may be employed. With increasing incentives for reducing the CO2 emissions off-shore, improving the thermal efficiency has become a focus area. Due to the peculiar low turbine outlet temperature and due to space and weight constraints, a steam bottoming cycle is not a convenient solution. On the contrary, organic Rankine cycles (ORCs) present the benefits of high simplicity and compactness. Furthermore, the working fluid can be selected considering the temperature profile at which the heat is supplied; hence the heat transfer process and the thermal efficiency of the cycle can be maximized. This paper is aimed at finding the most optimal ORC tailored for off-shore applications using an optimization procedure based on the genetic algorithm. Numerous working fluids are screened through, considering mainly thermal efficiency, but also other characteristics of the fluids, e.g. stability, environmental and human health impacts, and safety issues. Both supercritical and subcritical ORCs are included in the analysis. The optimization procedure is first applied to a conservative ORC where the maximum pressure is limited to 20 bar. Subsequently the optimal working fluid is identified by removing the restriction on the maximum pressure. Different limits on hazards and global warming potential (GWP) are also set. The study is focused on the SGT-500 gas turbine installed on the Draugen platform in the Norwegian Sea. The simulations suggest that, when a high hazard is accepted, cyclohexane is the best solution. With a turbine inlet pressure limit of 20 bar, the combined gas turbine-ORC system presents an efficiency of 43.7%, corresponding to an improvement of ... Article in Journal/Newspaper Norwegian Sea Technical University of Denmark: DTU Orbit |
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Technical University of Denmark: DTU Orbit |
op_collection_id |
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English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being |
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/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being Pierobon, Leonardo Larsen, Ulrik Nguyen, Tuong-Van Haglind, Fredrik Optimization of Organic Rankine Cycles for Off-Shore Applications |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being |
description |
In off-shore oil and gas platform efficiency, the reliability and fuel flexibility are the major concerns when selecting the gas turbine to support the electrical and mechanical demand on the platform. In order to fulfill these requirements, turbine inlet temperature and pressure ratio are not increased up to the optimal values and one or more redundant gas turbines may be employed. With increasing incentives for reducing the CO2 emissions off-shore, improving the thermal efficiency has become a focus area. Due to the peculiar low turbine outlet temperature and due to space and weight constraints, a steam bottoming cycle is not a convenient solution. On the contrary, organic Rankine cycles (ORCs) present the benefits of high simplicity and compactness. Furthermore, the working fluid can be selected considering the temperature profile at which the heat is supplied; hence the heat transfer process and the thermal efficiency of the cycle can be maximized. This paper is aimed at finding the most optimal ORC tailored for off-shore applications using an optimization procedure based on the genetic algorithm. Numerous working fluids are screened through, considering mainly thermal efficiency, but also other characteristics of the fluids, e.g. stability, environmental and human health impacts, and safety issues. Both supercritical and subcritical ORCs are included in the analysis. The optimization procedure is first applied to a conservative ORC where the maximum pressure is limited to 20 bar. Subsequently the optimal working fluid is identified by removing the restriction on the maximum pressure. Different limits on hazards and global warming potential (GWP) are also set. The study is focused on the SGT-500 gas turbine installed on the Draugen platform in the Norwegian Sea. The simulations suggest that, when a high hazard is accepted, cyclohexane is the best solution. With a turbine inlet pressure limit of 20 bar, the combined gas turbine-ORC system presents an efficiency of 43.7%, corresponding to an improvement of ... |
format |
Article in Journal/Newspaper |
author |
Pierobon, Leonardo Larsen, Ulrik Nguyen, Tuong-Van Haglind, Fredrik |
author_facet |
Pierobon, Leonardo Larsen, Ulrik Nguyen, Tuong-Van Haglind, Fredrik |
author_sort |
Pierobon, Leonardo |
title |
Optimization of Organic Rankine Cycles for Off-Shore Applications |
title_short |
Optimization of Organic Rankine Cycles for Off-Shore Applications |
title_full |
Optimization of Organic Rankine Cycles for Off-Shore Applications |
title_fullStr |
Optimization of Organic Rankine Cycles for Off-Shore Applications |
title_full_unstemmed |
Optimization of Organic Rankine Cycles for Off-Shore Applications |
title_sort |
optimization of organic rankine cycles for off-shore applications |
publisher |
The American Society of Mechanical Engineers (ASME) |
publishDate |
2013 |
url |
https://orbit.dtu.dk/en/publications/f34862f4-8db3-43dd-830a-4e2a82bda0e8 |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_source |
Pierobon , L , Larsen , U , Nguyen , T-V & Haglind , F 2013 , Optimization of Organic Rankine Cycles for Off-Shore Applications . in Proceedings of ASME Turbo Expo 2013 . vol. 5B , The American Society of Mechanical Engineers (ASME) , ASME Turbo Expo 2013 , San Antonio, TX , United States , 03/06/2013 . |
op_relation |
https://orbit.dtu.dk/en/publications/f34862f4-8db3-43dd-830a-4e2a82bda0e8 urn:ISBN:978-0-7918-5520-1 |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1810467470689959936 |