Development of composite adsorbents and storage vessels for domestically used adsorbed natural gas

Abstract: Experiments were designed to develop an adsorbed natural gas (ANG) technique suitable for household environment. The composite adsorbent was synthesized based on four key factors in terms of the maximization of thermal conductivity. The Toth equation was used to analyze adsorption equilibrium of methane on the composite. Charge/discharge cycles of methane on a cylindrical tank and a conformable tank were assessed for evaluation of the structure of tank and the partition plates, the composition of adsorbent, and the dynamic behaviors of storage system. The results show that the maximum thermal conductivity of the composite occurs where the composite adsorbent was consisted of the equal amount of activated carbon and expanded graphite (ENG), heated at the temperature of 600 °C for the duration of 30 seconds, and consolidated under pressure 9 MPa. It also indicates that thermal effect on the conformable tank is much weaker in comparison to that of cylindrical tank. As a consequence, in the case where the composite adsorbent is used, the insertion of partition plates into a conformable ANG vessel does not significantly improve heat conductivity. It suggests that the use of the composite adsorbent in a conformable tank provides a promising method to store natural gas for domestic purposes.

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