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CO2 hydrates crystallization kinetic parametric study: effect of stirring rate and impeller type.

Number: 0024

Author(s) : OSSWALD V., CLAIN P., DELAHAYE A., FOURNAISON L.

Summary

Carbon dioxide hydrates are ice-like crystalline solids composed of CO2 molecules trapped inside cages of hydrogen-bonded water molecules. CO2 hydrate slurries can be used as phase change material for industrial issues of cold distribution due to the high dissociation enthalpy of CO2 hydrate (around 374 kJ kg-1, higher than that of ice – 333 kJ kg-1). However, the formation rate of CO2 hydrate is a real limitation, and the way to control and promote it is a key parameter.
The present work investigates the kinetics of CO2 hydrate crystallization for two different types of stirrers: on the one hand a three-pitched blade stirrer and, on the other hand, a hollow shaft eight-blade Rushton turbine. A jacketed stirred batch reactor, with a specially developed sensor (a thermopile), is used to determine experimental heat balance on the cooling jacket. The mass fraction of crystallized hydrate during the time is determined directly from this heat balance. We conclude with the global performance of both heat and mass transfers of the stirrer and give general recommendations for the choice of stirrer type and scale-up process.

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Pages: 10 p.

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Details

  • Original title: CO2 hydrates crystallization kinetic parametric study: effect of stirring rate and impeller type.
  • Record ID : 30032377
  • Languages: English
  • Subject: Technology
  • Source: 14th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings:  Paris France, May 29-31, 2024.
  • Publication date: 2024/05/31
  • DOI: http://dx.doi.org/10.18462/iir.pcm.2024.0024

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