开滦矿区低级烟煤大分子结构演化特征及CO成因

发布时间：2018-04-26 23:32

本文选题：CO成因 + 分子结构　；参考：《煤田地质与勘探》2015年02期

【摘要】：针对开滦矿区CO超标现象,进行了煤分子结构演化特征及CO成因研究。通过对22个煤样的工业指标、元素组成、镜质组最大反射率(Rmax)、红外光谱和扫描电镜分析,结果发现:煤样的H/C先随Rmax增加,在Rmax达到0.8%后又迅速减少;煤样中富含C=O、C O、 O 等含氧基团,通过对芳碳率(fa)、环缩合度指数(2(R-1)/C)与Rmax的关联,发现随着Rmax的增加,fa先增加后减少,2(R 1)/C先减少后增加,拐点均在Rmax为0.8%处;煤样孔隙结构为粒间孔。研究认为,开滦矿区煤层赋存CO的成因是,变质作用过程中(Rmax为0.8%时),煤分子侧链因构造应力作用断裂、脱落产生大量自由基,进而结合生成CO,并赋存在煤层中保留下来。
[Abstract]:In view of the phenomenon of CO exceeding the standard in Kailuan mining area, the evolution characteristics of coal molecular structure and the origin of CO were studied. The industrial indexes, elemental composition, vitrinite maximum reflectance of 22 coal samples were analyzed by IR and SEM. The results showed that the H / C of coal samples increased with Rmax first, and then decreased rapidly after Rmax reached 0.8%. The coal samples are rich in oxygen groups such as C ~ (2 +) O ~ (2 +), O ~ (2 +) O ~ (2 +), and the correlation between C ~ (2 +) and Rmax is found. It is found that with the increase of Rmax, Rmax increases first, then decreases, then increases, and the inflexion point is 0.8% for Rmax. The pore structure of coal sample is intergranular pore. It is considered that the origin of CO in coal seam in Kailuan mining area is that during metamorphism, the Rmax is 0.8 and the side chain of coal molecules is fractured due to tectonic stress, resulting in a large amount of free radicals, and then combined to form COand, which is preserved in coal seam.
【作者单位】：中国矿业大学资源与地球科学学院煤层气资源与成藏过程教育部重点实验室;北华航空学院;
【基金】：河北省自然科学基金项目(E2011209026) 国家重点基础研究发展计划(973计划)课题(2009CB219605) 国家自然科学基金项目(50974050)
【分类号】：TD712

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