Men'shchikov Ilya E, Shkolin Andrey V, Strizhenov Evgeny M, Khozina Elena V, Chugaev Sergey S, Shiryaev Andrey A, Fomkin Anatoly A, Zherdev Anatoly A
Research Institute of Power Engineering, Bauman Moscow State Technical University, Baumanskaya 2-ya str. 5, 105005 Moscow, Russia.
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii Prospect, 31, build. 4, 119071 Moscow, Russia.
Nanomaterials (Basel). 2020 Nov 12;10(11):2243. doi: 10.3390/nano10112243.
The present work focused on the experimental study of the performance of a scaled system of adsorbed natural gas (ANG) storage and transportation based on carbon adsorbents. For this purpose, three different samples of activated carbons (AC) were prepared by varying the size of coconut shell char granules and steam activation conditions. The parameters of their porous structure, morphology, and chemical composition were determined from the nitrogen adsorption at 77 K, X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), and scanning electron microscopy (SEM) measurements. The methane adsorption data measured within the temperature range from 178 to 360 K and at pressures up to 25 MPa enabled us to identify the most efficient adsorbent among the studied materials: AC-90S. The differential heats of methane adsorption on AC-90S were determined in order to simulate the gas charge/discharge processes in the ANG system using a mathematical model with consideration for thermal effects. The results of simulating the charge/discharge processes under two different conditions of heat exchange are consistent with the experimentally determined temperature distribution over a scaled ANG storage tank filled with the compacted AC-90S adsorbent and equipped with temperature sensors and heat-exchanger devices. The amounts of methane delivered from the ANG storage system employing AC-90S as an adsorbent differ from the model predictions by 4-6%. Both the experiments and mathematical modeling showed that the thermal regulation of the ANG storage tank ensured the higher rates of charge/discharge processes compared to the thermal insulation.
本工作聚焦于基于碳吸附剂的吸附式天然气（ANG）储存与运输缩放系统性能的实验研究。为此，通过改变椰壳炭颗粒尺寸和蒸汽活化条件制备了三种不同的活性炭（AC）样品。通过77K下的氮气吸附、X射线衍射（XRD）、小角X射线散射（SAXS）和扫描电子显微镜（SEM）测量确定了它们的多孔结构、形态和化学成分参数。在178至360K温度范围和高达25MPa压力下测得的甲烷吸附数据使我们能够确定所研究材料中最有效的吸附剂：AC - 90S。测定了AC - 90S上甲烷吸附的微分热，以便使用考虑热效应的数学模型模拟ANG系统中的气体充/放过程。在两种不同热交换条件下模拟充/放过程的结果与在装有压实AC - 90S吸附剂并配备温度传感器和热交换器装置的缩放ANG储存罐上实验测定的温度分布一致。以AC - 90S作为吸附剂的ANG储存系统输送的甲烷量与模型预测值相差4 - 6%。实验和数学建模均表明，与隔热相比，ANG储存罐的热调节确保了更高速率的充/放过程。
