The present work deals with Natural gas (methane) adsorption onto super activated carbon (MAXSORB III) and graphite mixture in order to establish the reliability of this phenomenon as a valuable storage technique of natural gas. The objective of the subject work is to optimize different design and operating parameters of the adsorbed natural gas (ANG) system subjected to variable charge and the boundary conditions. The model duly considers the real gas properties of methane and variation of adsorbed phase properties as well as the heat of adsorption with adsorbate uptake. The storage capacities, storage efficiency as well as the filling time of activated carbon bed are studied for both constant inlet flow and constant inlet pressure charging conditions. The possibility of controlling length to width ratio (L/D ratio ranging from 0.35 to 7.8) is presented which will enable to optimize the geometry of storage tank for optimal storage efficiency. The effects of variation in inlet flow rates and variation in boundary conditions (natural convection, adiabatic wall, forced convection and constant wall temperature) on storage capacity as a function of other design and operating parameters are presented. From the study it is found that for suitable L/D ratio and external heat transfer coefficient it is possible to achieve a storage capacity of 150 V/V for constant pressure charging condition within 200 s. Addition of graphite powder for thermal enhancement of system resulted in 22%–27% (for different L/D ratios) rise in storage efficiency for model subjected to constant pressure charging and forced convection whereas 41.8%–50.4% rise in storage efficiency for model subjected to constant inlet flow and forced convection.

目前的工作涉及天然气（甲烷）在超级活性炭（MAXSORB III）和石墨混合物上的吸附，以建立这种现象的可靠性，作为一种有价值的天然气储存技术。主题工作的目的是优化承受可变电荷和边界条件的吸附天然气（ANG）系统的不同设计和运行参数。该模型充分考虑了甲烷的真实气体性质和吸附相性质的变化以及吸附热与被吸附物吸收的关系。在恒定的入口流量和恒定的入口压力充气条件下，研究了活性炭床的存储容量，存储效率以及填充时间。控制长宽比（L / D比范围从0.35到7）的可能性。提出了8），这将能够优化储罐的几何形状以获得最佳的存储效率。提出了进气流量变化和边界条件（自然对流，绝热壁，强制对流和恒定壁温）变化对存储容量的影响，该影响是其他设计和运行参数的函数。从研究中发现，对于合适的L / D比和外部传热系数，在200 s内恒压充电条件下可以实现150 V / V的存储容量。石墨粉的添加可提高系统的热效率，对于恒压充气和强制对流的模型，其存储效率提高了22％–27％（对于不同的L / D比率），而41.8％–50则提高了。