Thermodynamic Performance Indicators for Offshore Oil and Gas Processing: Application to Four North Sea Facilities

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

doi:10.2118/171565-pa

Cited by 5 publications

(9 citation statements)

References 20 publications

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“…The task efficiency has been defined and applied to different industrial processes, such as thermal power plants, air separation, heat storage systems, oil and gas platforms, and silicon production …”

Section: Exergy‐based Performance Indicatorsmentioning

confidence: 99%

“…Indeed, the most of the energy demand of a processing plant is due to compression power. Since the input well streams in the second platform have much higher pressure than those in the first platform, the need for compression power and, thus, the energy use of the process are much smaller …”

Section: Examples Of Application Of Exergy‐based Kpis To Industrial Pmentioning

confidence: 99%

“…Examples of use of the total exergy efficiency for evaluation of industrial processes include applications to renewable and non-renewable power plants, 44 production of petrochemical and oleochemical based alcohols, 44 hydrogen production, 45 paper production and recycling, 19 industrial chlor-alkali processes, 46 pyrometallurgical processes, 47 offshore oil and gas processing. 16,21 This indicator is most meaningful when one needs to determine the overall efficiency of a system where most of the exergy flows entering the system undergo some kind of transformation, or where no particular output flow is in focus. On the other hand, if one is interested in only some particular output flows, or not all exergy flows undergo transformations, the total exergy efficiency might give misleading results.…”

Section: Total Exergy Efficiencymentioning

confidence: 99%

“…Moreover, the task efficiency cannot be defined for systems where useful outputs cannot be expressed in terms of exergy, such as systems that are dissipative by design or whose function is to exchange heat with the environment (eg, cooling towers). 38 The task efficiency has been defined and applied to different industrial processes, such as thermal power plants, 5,48 air separation, 14 heat storage systems, 49 oil and gas platforms, 16,21,50,51 and silicon production. 52,53…”

Section: Task Exergy Efficiencymentioning

confidence: 99%

“…Since the input well streams in the second platform have much higher pressure than those in the first platform, the need for compression power and, thus, the energy use of the process are much smaller. 21 Since the specific exergy consumption is able to account for differences in energy and material inputs, to consider the corresponding exergy-based KPI might allow for a more fare comparison of different processes.…”

Section: Processing Plant From Power Plant From Silicon Plant From Vomentioning

confidence: 99%

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Exergy-based performance indicators for industrial practice

2018

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Summary Key performance indicators (KPIs) are powerful tools that industries can use not only to monitor their activities but also to highlight their unexploited potential. Energy‐based KPIs are nowadays mostly used to evaluate industrial process performances. However, these indicators might present some limitations and might give misleading results in some circumstances. An example is represented by industrial processes that make use of different energy forms (eg, electricity and heat) and of different material inputs, and that are therefore difficult to compare in terms of energy. A further example can be found in the Carnot engine that, despite being ideal, can have quite low energy efficiency (eg, the energy efficiency of a Carnot engine working between 700 and 300 K is 57%), suggesting that its performance can be improved. The use of exergy‐based KPIs allows us to overcome many of the limitations of energy‐based indicators. The exergy efficiency of Carnot engines is 100%, clearly indicating that the system cannot be further improved. Moreover, the use of specific exergy consumption instead of specific energy consumption to monitor the performance of a process allows one to take into account possible differences in quality of material and energy streams. In the present work, exergy‐based KPIs for industrial use are reviewed. The paper outlines advantages and limitations of the reviewed indicators, with the scope of promoting their use in industry. A systematic use of exergy‐based KPIs not only gives a meaningful representation of process performances in terms of resource use but it can also direct efforts to improve the processes. To better understand their meaning under different circumstances, the revised indicators are applied to 3 industrial processes.

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Section: Exergy‐based Performance Indicatorsmentioning

confidence: 99%

Section: Examples Of Application Of Exergy‐based Kpis To Industrial Pmentioning

confidence: 99%

Section: Total Exergy Efficiencymentioning

confidence: 99%

Section: Task Exergy Efficiencymentioning

confidence: 99%

Section: Processing Plant From Power Plant From Silicon Plant From Vomentioning

confidence: 99%

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Exergy-based performance indicators for industrial practice

2018

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On the exergy efficiency of CO2 capture: The relation between sub-process and overall efficiencies

Berstad

Gundersen

2023

Carbon Capture Science & Technology

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Development and use of exergy efficiency for complex cryogenic processes

Kim

Gundersen

2018

Energy Conversion and Management

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In this paper, exergy efficiencies, which are effective performance parameters for cryogenic processes, are categorized based on their exergy decomposition levels. However, the existing efficiencies are not standardized for a variety of unit operations. Thus, the extension of the exergy transfer effectiveness (ETE) has been suggested with a general mathematical expression. The extended ETE is defined by decomposing both thermo-mechanical and chemical exergy to the chemical component level. A case study with a complex natural gas liquefaction process and its optimization has also been performed. The results indicate that the extended ETE brings consistent and accurate results for all types of units, also properly reflecting the changes in process performance after optimization. Other efficiencies, however, struggle to measure the performance improvement for some equipment, even showing decreases in their efficiency values.

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Thermodynamic Performance Indicators for Offshore Oil and Gas Processing: Application to Four North Sea Facilities

Cited by 5 publications

References 20 publications

Exergy-based performance indicators for industrial practice

Exergy-based performance indicators for industrial practice

On the exergy efficiency of CO2 capture: The relation between sub-process and overall efficiencies

Development and use of exergy efficiency for complex cryogenic processes

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