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Influence of exhaust gas heating and L/D ratios on the discharge efficiencies for an activated carbon natural gas storage system

Author

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  • Sahoo, P.K.
  • Prajwal, B.P.
  • Dasetty, Siva Kalyan
  • John, M.
  • Newalkar, B.L.
  • Choudary, N.V.
  • Ayappa, K.G.

Abstract

A transient 2D axi-symmetric and lumped parameter (LP) model with constant outflow conditions have been developed to study the discharge capacity of an activated carbon bed. The predicted discharge times and variations in bed pressure and temperature are in good agreement with experimental results obtained from a 1.82 l adsorbed natural gas (ANG) storage system. Under ambient air conditions, a maximum temperature drop of 29.5K and 45.5K are predicted at the bed center for discharge rates of 1.0lmin-1 and 5.0lmin-1 respectively. The corresponding discharge efficiencies are 77% and 71.5% respectively with discharge efficiencies improving with decreasing outflow rates. Increasing the L/D ratio from 1.9 to 7.8 had only a marginal increase in the discharge efficiency. Forced convection (exhaust gas) heating had a significant effect on the discharge efficiency, leading to efficiencies as high as 92.8% at a discharge of 1.0lmin-1 and 88.7% at 5lmin-1. Our study shows that the LP model can be reliably used to obtain discharge times due to the uniform pressure distributions in the bed. Temperature predictions with the LP model were more accurate at ambient conditions and higher discharge rates, due to greater uniformity in bed temperatures. For the low thermal conductivity carbon porous beds, our study shows that exhaust gas heating can be used as an effective and convenient strategy to improve the discharge characteristics and performance of an ANG system.

Suggested Citation

  • Sahoo, P.K. & Prajwal, B.P. & Dasetty, Siva Kalyan & John, M. & Newalkar, B.L. & Choudary, N.V. & Ayappa, K.G., 2014. "Influence of exhaust gas heating and L/D ratios on the discharge efficiencies for an activated carbon natural gas storage system," Applied Energy, Elsevier, vol. 119(C), pages 190-203.
    • Handle: RePEc:eee:appene:v:119:y:2014:i:c:p:190-203
    DOI: 10.1016/j.apenergy.2013.12.057
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    References listed on IDEAS

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    1. Wegrzyn, J. & Gurevich, M., 1996. "Adsorbent storage of natural gas," Applied Energy, Elsevier, vol. 55(2), pages 71-83, October.
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    1. Chen, S.J. & Tao, Z.C. & Fu, Y. & Zhu, M. & Li, W.L. & Li, X.D., 2017. "CO2 separation from offshore natural gas in quiescent and flowing states using 13X zeolite," Applied Energy, Elsevier, vol. 205(C), pages 1435-1446.
    2. Tong, Wen & Lv, Yongqin & Svec, Frantisek, 2016. "Advantage of nanoporous styrene-based monolithic structure over beads when applied for methane storage," Applied Energy, Elsevier, vol. 183(C), pages 1520-1527.

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