چكيده به لاتين
Natural gas storage on adsorbent porous due to high operational safety at low pressures and temperatures, researchers have been addressed in recent years. In this study, adsorption of pure methane in a cylinder packed with active carbon and equipped with high porosity metal foam to increase heat transfer is studied numerically. The governing equations of fluid and energy flow in porous media including continuity equation, momentum equation, and energy equation to predict pressure and temperature distribution and adsorption rate are solved by finite element method. Darcy’s law is applied for relating speed and pressure in momentum equation and thermal equilibrium between fluid and adsorbent is assumed in energy equation. In addition, Dubinin–Astakhov adsorption isotherm is used to predict adsorption of natural gas on active carbon. First, effect of foam addition is studied by comparison of tank with foam and tank without foam, then effect of different foam parameters and operational parameters affecting adsorption process is studied. Results showed that application of metal foam significantly increased heat transfer and prevented the increasing of bed temperature so adsorption rate of natural gas in increased. So one can say that high porosity metal foams are very appropriate alternatives for application in in ANG process. Improve system performance at gas inlet 275 K, porosity εb = 0/2 and porous adsorbent foam between 0.86-0/92, respectively. Finally, radial and axial gas into the reservoir, which in this case showed the influence of centrifugal 2 percent more storage capacity.
Keywords: Modeling, Simulation, Adsorbed natural gas, Metal Foam, Activated carbon, ANG, Storage
