Experimental investigation on CO 2 hydrate formation/dissociation for cold thermal energy harvest and transportation applications

Sung Choi, Jungjoon Park, Yong Tae Kang

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Based on growing demand for the CO 2 capture issue, CO 2 hydrate formation/dissociation technologies for carbon capture have been highly spotlighted. CO 2 hydrate can be applied to the cold thermal energy storage since CO 2 hydrate has relatively higher dissociation enthalpy (459 kJ/kg) than ice slurries (333 kJ/kg). In this study, a lab-scale cold thermal energy harvest and transportation system using the CO 2 hydrate is tested. This system contains both hydrate formation and dissociation processes to study the effects of each component on the cold thermal energy harvest and transportation applications. Tetrahydrofuran (THF) based absorbents with various concentrations of tetrahydrofuran is produced and applied to the CO 2 hydrate system. COP (coefficient of performance), required work, heat transfer rate, and density of hydrate slurry are measured to improve the cold thermal energy harvest and transportation performances of the CO 2 hydrate system. The performance of CO 2 hydrate system is evaluated under various experimental conditions such as temperatures, pressures, and tetrahydrofuran concentrations. From the experimental results, it is found that the COP of 7.03 is obtained under tetrahydrofuran concentration of 1.5 mol% and formation pressure of 4 bar. It is also concluded that the CO 2 emission of the CO 2 hydrate system is estimated to be 7986 tCO 2 /year, which is 31.3% of the conventional district cooling system with the cooling capacity of 51,600 RT.

Original languageEnglish
Pages (from-to)1358-1368
Number of pages11
JournalApplied Energy
Volume242
DOIs
Publication statusPublished - 2019 May 15

Keywords

  • CO hydrate
  • Cold thermal energy harvest
  • Dissociation
  • District cooling
  • Energy transportation
  • Formation

ASJC Scopus subject areas

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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