Design and optimization of a power hub for Brazilian off-shore oil production units

Research output: Research - peer-reviewArticle in proceedings – Annual report year: 2018

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A worldwide trend to reduce greenhouse gases emissions has encouraged researchers to study more efficient solutions in diverse sectors, including Oil and Gas Industry. Most of offshore units are energized by redundant equipment operating at low loads, turning their energy consumption inefficient and increasing environmental impact. This work aims at identifying the optimal design of a gas and steam turbine combined cycle tailored for offshore oil production applications. The Brazilian pre-salt basin is taken as a case study to improve operational efficiency and reduce CO2 emissions of floating oil production units. The idea is to concentrate the power supply to a floating power plant, composed of combined cycle power blocks. A model is developed, integrating the design of the gas turbine, heat recovery steam generators (single pressure and double pressure), steam turbine and condenser. Genetic algorithms are applied in two optimization approaches, single-objective and multi-objective. Three parameters are evaluated: equipment purchase cost, thermal efficiency and total weight. The results of the multi-objective optimization indicate that dual-pressure arrangement steam cycles, featuring 3 gas turbines, 1 HRSG and 1 steam cycle, could be an attractive design solution for power hubs. This arrangement has a low cost and weight, while the thermal efficiency is maintained at a reasonable high level (around 53.2 %). Moreover, the results indicate that by introducing a power hub, the CO2 emissions may be reduced by 18.7 % to 27.2 % compared with a conventional FPSO design.
Original languageEnglish
Title of host publicationProceedings of ECOS 2018: 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Number of pages13
Publication date2018
StatePublished - 2018
Event31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2018) - Guimaraes, Portugal
Duration: 17 Jun 201822 Jun 2018

Conference

Conference31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2018)
CountryPortugal
CityGuimaraes
Period17/06/201822/06/2018

    Research areas

  • Offshore Power Systems, Floating Power Plants, Multi-objective Optimization, Offshore Grids
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