Studies On The Methane Storage Mechanism On Wet Carbon And The Charging/discharging Process

The surface area and pore size distribution are calculated by using the adsorption data of CO2 at 273.15K and the SLD theory. The storage of CH4 on wet activated carbon is systematically studied by measuring adsorption isotherms of CH4 on wet carbons at 275K. The pore structure has great effect on methane storage on wet carbon. Abundant micropore can reduce the methane hydrate formation pressure. But large pore volume and proper pore size distribution determine the methane storage on wet carbon. The pre-adsorbed water also has great influence on the methane storage on wet carbon. When the amount of pre-adsorbed water is a little bit larger than the pore volume, comparatively large methane storage amount is attained. But when the amount of pre-adsorbed water is much larger than the pore volume, comparatively low methane storage amount is attained.The process of methane hydrate formation is observed by combining the curve of charged methane gas and the temperature of adsorption bed center. The dynamic experiments of charging and discharging have been made. The thermal effect was fairly low during charging and discharging. The maximum temperature rise and decrease is about 8 and 14℃ respectively.The gas hydrate formation pressure of mixed gas and natural gas is 0.8 and 0.72Mpa respectively lower than that of methane on wet carbon BY-1. But the storage amount decreased. Natural gas hydrate can produce on wet carbon in three minutes after charging and the formation rate is much higher than that in pure water.