Natural gas consumption has doubled in the last fifteen years. Among all storage techniques, adsorbed natural gas (ANG) provides a reliable vehicle for safe utilization of natural gas. Despite all favorable characteristics of the ANG process, thermal adverse effects during charge and discharge processes are the most challenging issues facing adsorbed natural gas applications, especially for automotive usage. Mathematical modeling of an ANG tank can provide a reliable method to analyze and solve such problems. A robust and lumped model is presented to mimic the discharge process of an ANG tank storing pure component. The proposed model is very convenient compared to other available conventional models that require extensive computational efforts. Two experimental measurements and two simulation data sets (borrowed from literature) are recruited to validate the model predictions. The simulation results indicate proper agreement between the proposed model predictions and the validation data.