在液态CO2下煤炭孔结构的多尺度演变的表征 阶段变化裂变
Shikang Gao1, Zebiao Jiang1, Shixiang Tian1
1Guizhou University Mining College, Guiyang, Guizhou 550025, China.
ACS omega
|March 10, 2025
概括
液态CO2相变裂变 (LCPCF) 增强了煤孔结构,增加了巨孔和中孔体积和连接性. 这项技术在天然气开采和二氧化碳储存方面显示出前途.
科学领域:
- 地质科学 地质科学
- 能源工程 能源工程
- 材料科学 材料科学 材料科学
背景情况:
- 液态二氧化碳相变破裂 (LCPCF) 是一个有前途的绿色技术,用于提高煤层的透性.
- 有效的天然气开采和二氧化碳的地质储存取决于了解LCPCF对煤炭内部结构的影响.
研究的目的:
- 为了研究LCPCF在不同裂变位移下对煤的孔隙结构的影响.
- 描述毛孔性,毛孔体积,毛孔特定表面积 (PSA),碎形尺寸和连接性的变化.
主要方法:
- 低温液体N2吸附 (LT-N2) 的方法
- 在二氧化碳吸附过程中.
- CT扫描 扫描 扫描 扫描
- 入孔径测试 (MIP) 是一种入孔径测试.
主要成果:
- LCPCF显著增加了巨孔和中孔的多孔性,毛孔体积和PSA.
- 微孔特性基本保持不变.
- 宏孔碎片尺寸下降,而连接性多孔性显著增加 (高达160.33%),封闭性多孔性下降.
- 观察到较短的断裂距离和大约5米的撞击范围.
结论:
- LCPCF有效地改变了煤炭的孔隙结构,主要是增强更大的孔隙并改善连接性.
- 这些发现提供了对LCPCF机制的见解,以及对天然气提取和二氧化碳储存的优化.
相关概念视频
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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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