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Supersonic Separators for Offshore Processing of CO2-Rich Natural Gas: Comparison with Conventional Routes

  • Lara de Oliveira ArinelliEmail author
  • José Luiz de Medeiros
  • Alexandre Mendonça Teixeira
  • Ofélia de Queiroz Fernandes Araújo
Chapter

Abstract

This chapter implements the supersonic separator (SS) theory and modeling of Chap.  6 to real CO2-rich natural gas (NG) processing systems. To do this, four process alternatives for offshore conditioning of CO2-rich (44 mol%) NG are investigated. SS performances for water dew-point adjustment (WDPA), hydrocarbon dew-point adjustment (HCDPA), and CO2 capture are compared to conventional technologies, namely: WDPA by TEG absorption, HCDPA by Joule–Thomson expansion (JTE), and CO2 removal via membrane permeation (MP). Process alternatives are assessed in terms of power consumption and the following goal-attainments: lean NG with %CO2 ≤ 15%, sufficient for turboshaft power generation; low %CO2 LPG; and EOR fluid with %CO2 ≥ 75%. In terms of final gas quality, the best configuration was found to be the hybrid SS for WDPA/HCDPA and MP for CO2 removal, with lower footprint and lower power demand (−6.9%) relative to conventional process. SS for CO2 removal successfully reduced %CO2 from 44% to 21.85 mol%. Although less effective than MP, SS is a valid CO2 removal option producing fuel gas with ≈20 mol% CO2 suitable for turboshaft utilization. Moreover, CO2 is extracted from SS as a high-pressure liquid, allowing 44.5% reduction of power for CO2 separation/injection as EOR agent (corresponding to 30% of total power consumption).

Reference

  1. Arinelli, L.O., Trotta, T.A.F., Teixeira, A.M., de Medeiros, J.L., Araújo, O.Q.F.: Offshore processing of CO2 rich natural gas with supersonic separator versus conventional routes. J. Nat. Gas Sci. Eng. 46, 199–221 (2017).  https://doi.org/10.1016/j.jngse.2017.07.010CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Lara de Oliveira Arinelli
    • 1
    Email author
  • José Luiz de Medeiros
    • 1
  • Alexandre Mendonça Teixeira
    • 1
  • Ofélia de Queiroz Fernandes Araújo
    • 1
  1. 1.Escola de QuímicaFederal University of Rio de Janeiro (UFRJ)Rio de JaneiroBrazil

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