| 基于显微CT的煤生物降解过程中孔隙演化精细表征 |
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| 引用本文： | 董志伟,郭红玉,夏大平,刘喜乐,拜阳,赵国俊.基于显微CT的煤生物降解过程中孔隙演化精细表征[J].煤田地质与勘探,2019,47(5):63-69. |
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| 作者姓名： | 董志伟 郭红玉 夏大平 刘喜乐 拜阳 赵国俊 |
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| 作者单位： | 河南理工大学能源科学与工程学院;中原经济区煤层(页岩)气河南省协同创新中心 |
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| 基金项目： | 国家自然科学基金项目（41472129）；河南省科技攻关项目（172102310717，182102310845，192102310196） |
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| 摘 要： | 为了查明产甲烷菌群对不同变质程度煤厌氧发酵所产生的生物增透效应，利用显微CT对生物降解前后的煤样进行三维重建，分析煤的孔隙结构变化特征，通过扫描电镜观察产甲烷菌群在煤表面的吸附特征，探讨不同煤阶煤生物改造效果差异的原因。实验结果发现，厌氧发酵后煤样的孔隙率和吼道总长度增加，孔隙的连通性增强，表明在厌氧发酵过程中煤被微生物降解，促进煤中新孔隙的形成、扩展和贯通，从而实现煤的生物增透效应。随着煤的变质程度降低，煤中孔隙结构明显改善，主要原因在于产甲烷菌群更倾向于吸附在低阶煤的表面。研究结果可为煤层气生物工程的现场应用提供理论指导。
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| 关 键 词： | 煤 厌氧发酵 孔隙结构 显微CT 产甲烷菌群 |
| 收稿时间： | 2019-01-11 |
Micro CT-based meticulous characterization of porosity evolution of coal in the process of biodegradation |
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| Abstract: | To explore the bio-permeability enhancing effect via methanogen treatment on different rank coals after anaerobic fermentation, micro-CT was used to analyze the change characteristics of pore structure of coal before and after biodegradation. At the same time, the adsorption characteristics of methanogens on the coal surface after anaerobic biodegradation were observed by scanning electron microscopy to analyze the reasons for the effect difference of biological transformation of different rank coals. The results show that the porosity and total throat length of the coal samples biodegraded increase and the connectivity of the pores is enhanced, it is indicated that coal samples were degraded by microorganisms, which promotes the formation, expansion and penetration of new pore in the coal samples, thus realizing the bio-permeability enhancing effect of coal. With the decrease of coal rank, the improvement of pore structure is more obvious. The main reason for the change is that the surface of low rank coal is more suitable for the adsorption of methanogens. The research can provide a theoretical reference for the domestic coalbed biogenic gas production. |
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