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Experimental and theoretical study on CO2 hydrate slurry production.

Number: pap. n. 135

Author(s) : GROEN C., VASILESCU C., INFANTE FERREIRA C.

Summary

CO2 hydrates are a crystalline structure of water molecules enclosing CO2 molecules, formed in a stochastic process under appropriate conditions of temperature and pressure. They can be used for cold storage, reducing the charge of the conventional synthetic refrigerants that should be phased out for either legal, safety or environmental reasons. The main advantages of CO2 hydrates are its formation conditions (phase change above 0°C) and the enthalpy of dissolution (about 500 kJ/kg), which is higher than that of water ice (333 kJ/kg). An experimental set-up has been designed for continuous CO2 hydrate slurry production. A saturated mixture of water and CO2 is cooled at temperatures from 8 to 4°C under hydrate forming conditions (10 to 40 bar). Experimental results are presented and discussed. In order to predict the amount of hydrates formed in the mixture a theoretical model is developed using an equilibrium model, a flash model and a crystal growth model. The equilibrium model is based on the Peng-Robinson-Stryjek-Vera equation of state combined with the Huron-Vidal-Orbey-Sandler mixing rules and the Gibbs free energy is calculated with the UNIQUAC model. This model is validated by comparing the predicted results with experimental data. The mean average error is within 0.45%.

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Pages: 8 p.

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Details

  • Original title: Experimental and theoretical study on CO2 hydrate slurry production.
  • Record ID : 30005013
  • Languages: English
  • Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Publication date: 2012/06/25

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