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在-粘土页岩中地下储存气:实验和密度函数理论调查

Alankaa Al-Harbi^1,2, Mohammed Al-Marri^1,2, Giuliano Carchini¹

¹Gas Processing Center (GPC), College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar.

|December 11, 2023

概括

页岩气储库显示出安全,可逆的气储存的潜力. 这项研究发现页岩表面的吸附量最小,表明没有损失或结构损坏,允许按需回收.

科学领域:

地质化学地质化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

全球努力减少温室气体排放需要化石燃料的替代品.
(H2) 是一个有前途的替代燃料,但由于其特性和稳定性,长期储存仍然是一个重大挑战.
页岩气库,特别是富含和粘土矿物质的页岩气库,正在被探索为潜在的气储存地点.

研究的目的:

调查使用页岩气储用于按需储存气的可行性.
用计算和实验方法了解页岩表面的吸附机制.
评估温度和压力对页岩中储能容量的影响.

主要方法:

密度函数理论 (DFT) 分子模拟被用于模拟酸盐-高酸盐接口上的吸附.
用Bader的电荷分析来确定在吸附过程中电荷的转移.
在50-100°C的温度和高达20bar的压力下,对Midra页岩 (富含Palygorskite) 进行了实验调查,以测量吸收.

主要成果:

DFT模拟显示了页岩表面的的物理吸收,吸附能量低 (0.01至-0.21 eV).
巴德尔的电荷分析证实没有显著的电荷转移,这表明与表面的相互作用很弱.
实验结果显示,米德拉页岩不会在化学或物理上保留气,这证实了可逆储存潜力.

结论:

页岩气储库适合用于可逆储存,因为吸附率最小.
在页岩水库中储存气确保不损失气,并保持水库的结构完整性.
这种方法提供了一种安全有效的按需回收方法,支持向更清洁的能源过渡.

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