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Améliorer la consommation spécifique d’électricité des installations de séparation cryogénique de l'air en utilisant la chaleur résiduelle des centrales de captage du carbone.

Improving specific power consumption of cryogenic air separation plants using waste heat of carbon capture power plants.

Numéro : pap. 0032

Auteurs : SINGLA R., CHOWDHURY K.

Résumé

A cryogenic air separation unit (ASU) with double column configuration produces pressurized oxygen (PGOX) at purity of 99.6% and above. A single column configuration is sufficient to produce at a purity of 95%, which is required for carbon capture power plants (CCPP). It requires less capital and consumes lower power than a double column configuration. It further makes an economic sense if the unutilized bone-dry low purity (waste) nitrogen, also called pressurised impure gaseous nitrogen (PiGAN), may be heated by the waste heat available in CCPP. It is expanded in a gas-based reheat cycle to produce electricity. This may partially
offset the power consumed in the ASU. Using exergy analysis, pressure of PiGAN is determined in such a way that the net power consumed by ASU (power consumed minus power generation in power cycle) is minimized. At this pressure of PiGAN, single column ASU consumes 12.5% less power than double column ASU.

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Pages : 8

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Détails

  • Titre original : Improving specific power consumption of cryogenic air separation plants using waste heat of carbon capture power plants.
  • Identifiant de la fiche : 30025761
  • Langues : Anglais
  • Source : Cryogenics 2019. Proceedings of the 15th IIR International Conference: Prague, Czech Republic, April 8-11, 2019.
  • Date d'édition : 08/05/2019
  • DOI : http://dx.doi.org/10.18462/iir.cryo.2019.0032

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