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化工进展  2015 

封存过程中二氧化碳对煤体理化性质的作用规律

DOI: 10.16085/j.issn.1000-6613.2015.01.046, PP. 258-265

Keywords: 二氧化碳,煤,存埋,超临界流体,物理化学特性

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Abstract:

强化煤层气(CH4)开采的深部煤层封存二氧化碳(CO2)技术能够将主要人为温室气体进行有效存储,但基于煤体特征和适宜储层条件下的CO2流体特性,CO2流体和煤体之间存在除吸附作用以外的其他流-固作用。CO2流体和煤体之间的流-固作用关系既会影响煤层的CO2封存潜力又会引发潜在的环境问题。为此,本文结合国内外的相关研究工作,介绍了煤层封存CO2过程中煤体理化性质变化的研究成果,归纳了煤体理化性质变化对煤层封存CO2潜力的影响,指出了煤体理化性质变化由此造成的环境安全与健康风险问题。分析表明深部煤层封存CO2过程中流-固作用及其影响主要包括两个方面①CO2流体能够诱导煤基质发生溶胀效应,因而会影响注入的CO2流体在煤层内部的扩散和吸附能力;②CO2流体具有萃取煤基质内部有机物的能力,会对环境安全与健康造成威胁。此外,本文还指出了煤基质溶胀机理及其可逆性、煤基质中被萃取出有机物的定性与定量分析是后续煤和CO2流体作用关系的重要研究方向。

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