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چکیده
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Natural gas as an alternative fuel in transportation sector has many environmental and economic advantages. Recently, adsorbed natural gas (ANG) as a low pressure and safe method for the storage of natural gas is considered. Adsorbed natural gas is a technology in which natural gas is adsorbed by a porous adsorbent material at relatively low pressures. When a natural gas storage vessel is filled with a suitable adsorbent material, the energy density will be greater than that of the same vessel without the adsorbent when filled to the same pressure.
Understanding the dynamic behavior of adsorbed natural gas system in order to implement this technology is very important. In this research from study of available literature, a cylindrical tank with a volume of approximately 50 liters with a gas diffuser wich installed in the center of the vessel has been selected for the storage of natural gas, then the governing conservation of mass and energy equations are derived. The resulting system of nonlinear partial differential equations is solved using an implicit finite difference numerical method with Newton Raphson iteration method and a thorough covalidation analysis is performed, with both numerical and experimental data available in the literature.
pressure and temperature behavior of the system during charge and discharge of the tank was discussed and it has been found that temperature fluctuations caused due to heat of adsorption during charge and discharge of the ANG tank, causing a sharp reduction in dynamic efficiency that gass diffuser by changing the flow direction during discharge from axial to radial reduces the performance loss by increasing the heat transfer from the wall to the central region.
After that, the influence of various parameters such as gas flow rate, reservoir wall thermal capacitance, thermal conductivity of adsorbent, wall heat transfer coefficient, saturation capacity of the adsorbent, diffusional resistance of the adsorbent and the dimension
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