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Formation kinetics of isobutane hydrate as cool storage medium.

Author(s) : XIE Y., LI G., LIU D., et al.

Summary

The formation kinetics of isobutene gas hydrate was studied under the initial pressure of 0.38 MPa in a hydrate reactor. The effect of water volume, stirring rates, initial coolant temperatures, water sample and sodium dodecyl sulfate (SDS) concentration on isobutene hydrate formation were researched. The speed and density degree of isobutene hydrate formation have been discussed by the length of induction time in formation process and residence time near phase transition temperature point in decomposition process respectively. Results showed that more hydrate could be obtained in the water volume of 200 ml than other, because larger gaseous-liquid space ratio is good for hydrates formation. Larger stirring rate (250 r/min) could increase disturbance and improve the gas-liquid mass and heat transfer, which lead to quick hydrate formation. But too large stirring rate could also lead to the decomposition of hydrate. The lower the initial coolant temperature, the lager the super cooling degree, and the more the hydrate formed. Historical water can decrease the induction time for its "memory effect". Comparing to the situation without SDS, the induction time decreased by 18 min with SDS, and the gas fraction in formed hydrate increased, because surfactant SDS can effectively reduce the interfacial tension of gas-water interface and accelerate the rate of gas molecules' entering into water phase.

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Pages: 2009-4

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Details

  • Original title: Formation kinetics of isobutane hydrate as cool storage medium.
  • Record ID : 2009-1663
  • Languages: English
  • Source: 8th Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning
  • Publication date: 2009/06/03

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