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Thermal integration and modelling of the chilled ammonia process

Authors
Journal
Energy Procedia
1876-6102
Publisher
Elsevier
Publication Date
Volume
4
Identifiers
DOI: 10.1016/j.egypro.2011.02.045
Keywords
  • Chilled Ammonia Process
  • Aspen Plus
  • Co2Capture
  • Post Combustion
  • Pitzer
Disciplines
  • Design
  • Physics

Abstract

Abstract This work evaluates the performance of the chilled ammonia process (CAP) for CO 2 capture. An equilibrium based thermodynamic model of the NH 3-CO 2-H 2O system is combined with a reactor system description of the CAP to estimate the electric efficiency of a state-of-the-art coal-fired power plant equipped with the CAP. The ammonia concentration is a critical design parameter; for the modelled concentrations the specific energy requirement in the reboiler varies between 2200–2800 kJ/kg CO 2 captured. When equipped with the CAP for CO 2 capture, the electric efficiency of the reference plant decreases with 8 to 10%, depending on cooling water temperature and ammonia concentration.

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