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Amélioration du transport de coulis d’hydrate de CO2 en écoulement en boucle : effet d’additifs anti-agglomérants sur ses propriétés rhéologiques.

Improvement of CO2 hydrate slurry transportation in flow loop: effect of anti-agglomerant additives on rheological properties.

Numéro : pap. n. 1338

Auteurs : CLAIN P., BOUFARES A., BENMESBAH F., et al.

Résumé

Previous studies showed that CO2 hydrate slurries are potentially one of the top PCM slurries used as a secondary refrigerant, due to high dissociation enthalpy. However, crystal agglomeration phenomenon observed with solid-rich slurry that can lead to pipe plugging is a real limitation for an industrial application, and use of additives could be a way to prevent it. Experimental rheological behaviour of CO2 hydrate suspensions with a rheology modifier additive in various concentrations was studied in a dynamic flow loop using gaseous CO2 injection in a precooled water to crystallize CO2 hydrates and to measure pressure drops as a function of volume flow rate for various solid particle fractions. The Herschel-Bulkley model was used to characterize the laminar flow regime and a shear-thinning behaviour was obtained. A FBRM probe was used to characterise chord length distributions of CO2 hydrates and exhibited a threshold effect for this additive for the slurry. The results showed that the use of the additive avoids slurry agglomeration phenomenon, bring a threshold to the slurry and improves their flow properties due to the affinity of additive to CO2 hydrates.

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Pages : 8

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Détails

  • Titre original : Improvement of CO2 hydrate slurry transportation in flow loop: effect of anti-agglomerant additives on rheological properties.
  • Identifiant de la fiche : 30026104
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.1338

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