Thermodynamic analysis of a novel power plant with LNG (liquefied natural gas) cold exergy exploitation and CO2 capture

  1. Romero Gómez, M 1
  2. Romero Gómez, J 1
  3. López-González, L.M 2
  4. López-Ochoa, L.M 2
  1. 1 Universidade da Coruña
    info

    Universidade da Coruña

    La Coruña, España

    ROR https://ror.org/01qckj285

  2. 2 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Energy

ISSN: 0360-5442

Año de publicación: 2016

Volumen: 105

Páginas: 32-44

Tipo: Artículo

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DOI: 10.1016/J.ENERGY.2015.09.011 SCOPUS: 2-s2.0-85027928341 WoS: WOS:000378192800005 GOOGLE SCHOLAR

Otras publicaciones en: Energy

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Resumen

The LNG (liquefied natural gas) regasification process is a source of cold exergy that is suitable to be recovered to improve the efficiency of thermal power plants. In this paper, an innovative power plant with LNG (liquefied natural gas) exergy utilisation and the capture of CO2 proceeding from the flue gases is presented. It is characterised by the recovery of LNG cold exergy in a closed Brayton cycle and through direct expansion in an expander coupled to an electrical generator. Moreover, this novel power plant configuration allows CO2 capture, through an oxy-fuel combustion system and a Rankine cycle that operates with the flue gases themselves and in quasi-critical conditions. The greatest advantage of this plant is that all the recoverable LNG exergy is used to increase the efficiency of the CBC (closed Brayton cycle) and in direct expansion whereas, in other power cycles found in literature that associate LNG regasification and CO2 capture, part of the LNG exergy is used for condensing flue gas CO2 for its subsequent capture. As a result, a high efficiency power plant is achieved, exceeding 65%, with almost zero greenhouse gas emissions. © 2015 Elsevier Ltd.