Thermo-Economic Modelling and Process Integration of CO2-Mitigation Options on Oil and Gas Platforms

Tuong-Van Nguyen, Laurence Tock, Peter Breuhaus, Francois Marechal, Brian Elmegaard

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Abstract

The offshore extraction of oil and gas is an energy-intensive process associated with large CO2 and CH4 emissions to the atmosphere and chemicals to the sea. The taxation of these emissions has encouraged the development of more energy-efficient and environmental-friendly solutions, of which three are assessed in this paper. The integration of steam bottoming cycles on the gas turbines or of lowtemperature power cycles on the export gas compression can result either in an additional power output, or in a greater export of natural gas. Another possibility is to implement a CO2-capture unit, which allows recovering CO2 that can be used for enhanced oil recovery. In this paper, a North Sea platform is considered as case study, and the site-scale retrofit integration of these three options is analysed, considering thermodynamic, economic and environmental performance indicators. The results illustrate the benefits of valorising the waste heat recovered from the exhaust gases, as the total CO2-emissions can be reduced by more than 15 %. Exploiting low-temperature heat seems feasible, although more challenging in retrofit situations. Integrating CO2-capture appears promising with a CO2-avoidance cost between 23 and 29 $/tCO2 for the chosen economic assumptions.
Original languageEnglish
Book seriesChemical engineering transactions
Volume39
Pages (from-to)1081-1086
Number of pages6
ISSN1974-9791
DOIs
Publication statusPublished - 2014
Event17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction - Prague, Czech Republic
Duration: 23 Aug 201427 Aug 2014
Conference number: 17

Conference

Conference17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction
Number17
CountryCzech Republic
CityPrague
Period23/08/201427/08/2014

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