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CO2 absorption by Al2O3/NaCl aqueous solution nanofluids.

Number: pap. n. 62

Author(s) : LEE J. W., PANG C., KANG Y. T.

Summary

Recently, many studies have been focused on the reduction of CO2 emission, which is a main greenhouse gas. However, the temperature of the absorbent during the physical absorption process should be maintained at a low temperature (about -40oC) to increase the CO2 gas absorption rate according to the Henry's solubility law. Therefore, huge amount of energy is required to keep such a low temperature of the absorbent in the CO2 removal systems. In this study, Al2O3 nanoparticles are combined into NaCl aqueous solution to enhance the CO2 mass transfer and thermal conductivity of the base fluid (3.5 wt% NaCl aqueous solution). NaCl aqueous solution is similar to the composition of the seawater which regulates the amount of CO2 at atmosphere. The absorption experiments are carried out in a bubble type absorber system. And the transient hot-wire method is applied for measuring the thermal conductivity of nanofluids. The nanoparticle concentration ranges from 0.005 to 0.1 vol% for the absorption experiment. The thermal properties of nanofluids are measured at a temperature of 20oC. It is found that the CO2 absorption is enhanced up to 12.5% at 0.01 vol% of Al2O3/NaCl aqueous solution nanofluids. And the thermal conductivity of the nanofluids enhances 3.4% at 0.1 vol% of Al2O3/NaCl aqueous solution nanofluids. In addition, experiments were carried out to estimate the stable dispersion of the nanofluids. The nanofluids proposed in the present study are expected to be a promising candidate for removing CO2 gas in a physical absorption process.

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Pages: 7 p.

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Details

  • Original title: CO2 absorption by Al2O3/NaCl aqueous solution nanofluids.
  • Record ID : 30014329
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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