天然气吸附储存过程的数值模拟研究

Numerical study of charging process of adsorbed natural gas storage

针对天然气吸附储存罐,建立了快速绝热充气过程的二维传热传质模型,并进行了数值模拟计算。给出了充气过程中储罐内吸附床层的温度和吸附量的分布特征:随着吸附进行,储罐沿轴向从入口温度逐渐升高,储罐后部温度升幅最大,导致吸附床层后部的吸附量较低;与等温吸附相比,快速绝热充气的吸附效率只有65%。因此,要提高吸附量,就必须强化储罐内部吸附床层的热量传递过程,如加入热交换管、导热肋片等,以降低储罐吸附床层的温度。

Based on the quick charge process of the adsorbed natural gas storage system, a two-dimensional, adiabatic model was established and thereafter numerical solved. The characteristics of the temperature and the mass adsorption distribution were obtained. As the charging process proceeds, the temperature increases from the inlet, and the largest temperature increase appears at the end section and this large temperature increase results in lower mass adsorption. The average adsorption ratio is only 0.65 compared with that of a constant-adsorption process. Therefore, it is very important to enhance the heat transfer between the system and the environment and thus reduce the temperature increase for improving the adsorption efficiency.