On the definition of exergy efficiencies for petroleum systems: Application to offshore oil and gas processing

Nguyen, Tuong-Van; Voldsund, Mari; Elmegaard, Brian; Ertesvåg, Ivar S.; Kjelstrup, Signe

doi:10.1016/j.energy.2014.06.020

Cited by 51 publications

(29 citation statements)

References 36 publications

(78 reference statements)

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“…[8], different approaches for the evaluation of the exergy efficiency for petroleum systems are considered and applied to four oil platforms that differ by working conditions and design. Then, an alternative definition, called the component-by-component exergy efficiency is proposed for this technology, based on the decomposition of the exergy flows at the level of the chemical compounds.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

A more general exergy function and its application to the definition of exergy efficiency

Zanchini

2015

Energy

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Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

A more general exergy function and its application to the definition of exergy efficiency

Zanchini

2015

Energy

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“…Voldsund et al [9] applied exergy analysis on a real production day of an offshore platform. Most of the studies [4,[6][7][8] stressed the importance of good use of the waste heat contained in the exhaust gases.…”

Section: Introductionmentioning

confidence: 99%

“…Nguyen et al [4] suggested a component-by-component exergy efficiency formulation for offshore oil and gas processing. De Oliveira & Van Hombeeck [5] studied exergetic efficiency and losses of a Brazilian offshore platform.…”

Section: Introductionmentioning

confidence: 99%

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Deep Water Cooled ORC for Offshore Floating Oil Platform Applications

Val¹,

Silva²,

Oliveira³

2017

International Journal of Thermodynamics

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Due to global warming, environmental pollution and cost reduction, increasing efficiency of electricity conversion has become a key issue for the offshore market. This paper proposes an Organic Rankine Cycle (ORC), which uses heat waste from exhaust gases of an FPSO (Floating, Production, Storage and Offloading unit) as heating source, and deep ocean water as cooling source. A genetic algorithm optimization was conducted targeting maximization of net power output, by taking in to consideration of 23 working fluids. Expander inlet temperature and pressure were set as independent variables. The analysis encompasses subcritical or supercritical conditions and recuperation was included in a second version of the system as an option. The first configuration presented ethanol as optimal fluid, followed by toluene and the second configuration indicated cyclohexane followed by ethanol. Use of recuperation, when feasible, increased power output specially for cycles operating with dry and isentropic fluids, presenting an average contribution of 22.7%. Net power and efficiency results from ORC using deep sea water in condenser were presented and compared with ORC using shallow ocean water as cooling source and with Carnot efficiency operating under the same temperatures. Use of deep water raised net power output by 23.3% (cyclohexane recuperative ORC) and 12.5% (ethanol non-recuperative ORC) for the optimal configurations.

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“…Exergy analyses in the offshore industry were performed by Oliveira and Van Hombeeck (Oliveira Jr and Van Hombeeck 1997), Nguyen et al (T. Van Nguyen et al 2013; T.-V. Nguyen et al 2014), Voldsund et al Voldsund et al 2014), and Carranza and Oliveira (Carranza Sánchez and Oliveira Jr 2015a), but these analyses were applied to fixed offshore platforms. This work is focused to the energy and exergy analyses of the FPSO offshore facility, and preliminary works related to exergy analysis of a FPSO were carried out by Barrera et al (Barrera and Bazzo 2013;Barrera, Bazzo, and Kami 2015) and Carranza and Oliveira (Carranza Sánchez and Oliveira Jr 2015b).…”

Section: Introductionmentioning

confidence: 99%