Phase-change materials

Thursday August 29, 2019 from 13:30 to 15:10

Room: 524c

TS-416 .4 Improvement of CO2 hydrate slurry transportation in flow loop: effect of anti-agglomerant additives on rheological properties

Pascal Clain, France

Associate professor
DVRC_Modeling Group/Irstea_GPAN
DVRC/Irstea

Abstract

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

Pascal Clain1,3, Amokrane Boufares1,2, Fatima Benmesbah1,4, Amira Zennoune1, Véronique Osswald1, Hong Minh Hoang1, Didier Dalmazzone2, Anthony Delahaye1, Laurence Fournaison1.

1GPAN Irstea, ANTONY, France, Metropolitan; 2UCP, ENSTA Paristech, PALAISEAU, France, Metropolitan; 3Leonard de Vinci Pôle Universitaire, Research Center, PARIS - LA DEFENSE, France, Metropolitan; 4Ifremer, BREST, France, Metropolitan

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 and the capillary viscometer method. The Herschel-Bulkley model was used to characterize the laminar flow regime and a shear-thinning behaviour was obtained. Chord length distributions of CO2 hydrates were characterised and exhibited a threshold effect for this additive for the slurry.

The results showed that 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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