Performance investigation of a power, heating and seawater desalination poly-generation scheme in an off-shore oil field

Valérie Eveloy, Peter Rodgers, Linyue Qiu

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Hydrocarbon production fields are energy-intensive, with significant demands for on-site power, process heat and fresh water, particularly in arid climates. A poly-generation scheme based on the conversion of gas turbine exhaust thermal power into mechanical work to drive a seawater reverse osmosis unit and generate process heat in an off-shore oil field in the Arabian Gulf is evaluated thermodynamically and economically. The prime mover exhaust thermal power is recovered using a bottoming organic Rankine cycle (ORC), with four working fluids used in commercial ORC systems evaluated. The performance of the poly-generation system is assessed both on a yearly and a seasonal basis. The octamethyltrisiloxane (MDM) cycle yields 6 MW of net power output at ideal and overall exhaust gas heat recovery efficiencies of 14% and 10%, respectively, 37 MW of process heat, and 1380 m3/hour of permeate. The reverse osmosis unit operates at a specific energy consumption and exergy efficiency of 4.1 kWh/m3 and 29%, respectively. The exergetic efficiency of the poly-generation system is estimated at 32%, thereby enhancing the efficiency of the original gas turbine power generation system by 6%. The system becomes profitable after approximately three years for subsidized local water and natural gas prices.

Original languageBritish English
Pages (from-to)26-39
Number of pages14
JournalEnergy
Volume98
DOIs
StatePublished - 1 Mar 2016

Keywords

  • Economic
  • Exergy
  • Heating
  • Organic Rankine cycle
  • Poly-generation
  • Seawater desalination

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