Heat transfer and pressure drop characteristics of CO2 mixtures in a pipeline under the seawater condition

• Published in: International journal of heat and mass transfer 2019-06, Vol.136, p.627-634
• Main Authors: Baik, Wonkeun, Lee, Wonjun, Yun, Rin
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Carbon sequestration; Chillers; CO2 impurities; CO2 transportation; Gear pumps; Heat exchangers; Heat transfer; Heat transfer coefficient; Heat transfer coefficients; Impurities; Methane; Polyvinyl chloride; Pressure drop; Seawater; Supercritical condition
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2019.03.026

•Average pressure drop of CO2 + CH4 increased with decreasing CO2 mole fraction.•Heat transfer coefficient of CO2 mixtures was decided by the type of the impurity.•Thermal properties of CO2 mixture can be less changed at higher transportation pressure. Captured CO2 from CO2 emission sources contains impurities such as N2, CH4, H2O, O2 and Ar, and these are transported with the CO2 in pipelines under supercritical condition. The aim of this study is to experimentally investigate the effects of impurities in CO2 + N2 and CO2 + CH4 on the in-tube heat transfer and pressure drop under seawater environmental conditions during pipeline transportation. The experimental apparatus consisted of a test section, heat exchangers that were connected to two chillers, and a magnetic gear pump. The test section was made by a cooper tube that was inserted into a Polyvinyl Chloride (PVC) pipe to form a double-tube. The operational temperature and pressure of the CO2 mixture ranged 25–55 °C and 80–100 bar, respectively. The mass flux was varied by 300, 500, and 700 kg m−2 s−1. The mole fraction of CO2 in the CO2 mixtures was varied from (1.00–0.95). When the CO2 mole fraction decreased from 1.00 to 0.95, the maximum heat transfer coefficients of CO2 + N2 and CO2 + CH4 decreased by 4157 and 1224 W m−2 K−1, respectively, and the average pressure drop of CO2 + CH4 increased by 29.87%.