基于吸附能量的不同气体环境下的煤炭透性研究
Nan Ding1,2, Leilei Si1,2, Jianping Wei1,2
1School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China.
ACS omega
|June 26, 2023
概括
煤炭中的气体吸附降低了水的湿透性,影响了煤层注入水的安全性. 更高的气压和更强的气体吸附能力显著增加了煤水接触角度,阻碍了有效的注水.
科学领域:
- 地球科学 地球科学 地球科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 煤层水注入对于防止气体喷发和煤尘灾难至关重要.
- 煤炭中吸附的气体对煤炭水的湿产生负面影响,这是注水效率的关键因素.
- 了解高压吸附气体条件下的煤水湿化对于安全采矿至关重要.
研究的目的:
- 在各种气体环境下实验性地研究煤-水接触角的机制.
- 在预先吸收的气体环境中分析煤炭水吸附机制.
- 为提高煤层水注入效率提供理论支持.
主要方法:
- 在不同的气体环境下 (CO2,N2,He) 对煤-水接触角度的实验研究.
- 模拟分子动力学以分析煤炭水吸附机制.
- 福利埃变换红外光谱 (FTIR),X射线衍射 (XRD) 和13C NMR用于材料特征.
主要成果:
- 接触角在CO2 (17.62°) 中增长最显著,其次是N2 (10.21°) 和He (8.89°).
- 随着气体压力的增加,水吸附能力下降,煤表面自由能量下降,煤结构稳定.
- 吸附气体占据了主要的吸附点,与水分子竞争,减少了煤炭的湿透性.
结论:
- 增加的气体压力和更强的气体吸附能力增强了煤气相互作用,减少了煤的可湿性.
- 气体和水分子之间的竞争性吸附在更强的气体吸附时更加明显.
- 结果提供了理论见解,通过解决气体干扰来优化煤层水注入.
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