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Integration of a Ca looping system for CO2 capture in existing power plants

Authors

  • Isabel Martínez,

    Corresponding author
    1. Instituto de Carboquímica (CSIC), Energy and Environment Department, Miguel Luesma Castán 4, 50018 Zaragoza, Spain
    • Instituto de Carboquímica (CSIC), Energy and Environment Department, Miguel Luesma Castán 4, 50018 Zaragoza, Spain
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  • Ramón Murillo,

    1. Instituto de Carboquímica (CSIC), Energy and Environment Department, Miguel Luesma Castán 4, 50018 Zaragoza, Spain
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  • Gemma Grasa,

    1. Instituto de Carboquímica (CSIC), Energy and Environment Department, Miguel Luesma Castán 4, 50018 Zaragoza, Spain
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  • Juan Carlos Abanades

    1. Instituto Nacional del Carbón (CSIC), Chemistry of Materials Department, Francisco Pintado Fe 26, 33011 Oviedo, Spain
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Abstract

This work analyses a Ca looping system that uses CaO as regenerable sorbent to capture CO2 from the flue gases generated in power plants. The CO2 is captured by CaO in a CFB carbonator while coal oxycombustion provides the energy required to regenerate the sorbent. Part of the energy introduced into the calciner can be transferred to a new supercritical steam cycle to generate additional power. Several case studies have been integrated with this steam cycle. Efficiency penalties, mainly associated with the energy consumption of the ASU, CO2 compressor and auxiliaries, can be as low as 7.5% p. of net efficiency when working with low-CaCO3 make-up flows and integrating the Ca looping with a cement plant that makes use of the spent sorbent. The penalties increase to 8.3% p. when this possibility is not available. Operation conditions aiming at minimum calciner size result in slightly higher-efficiency penalties. © 2010 American Institute of Chemical Engineers AIChE J, 2011

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