Department of Geology and Surveying and Mapping, Shanxi Institute of Energy
China Coal Technology and Engineering Group Shenyang Research Institute
State Key Laboratory of Coal Mine Safety Technology

煤变质作用过程存在多次阶跃点,并发生以热降解-热裂解作用为主形成烷烃气。为探究中阶煤结构演化特征,以西山煤田中阶煤为研究对象,采用傅里叶红外光谱测试分析方法对中阶煤化学结构演化特征及其与烷烃气碳同位素关系进行了研究。结果表明,煤层气碳同位素值位于-57.20‰~-31.41‰之间,乙烷与甲烷碳同位素值相比变化相对较弱。样品中羟基以自缔合氢键为主,芳香烃结构以苯环三取代为主,芳碳率在演化中变化较弱,芳环缩合度则出现增大—减小—增大的变化趋势,脂肪烃以亚甲基含量为主,支链化程度参数在演化中出现减小—急增—减小的阶段性变化。结合甲烷碳同位素特征分析认为,中阶煤阶段结构演化可划分为五个阶段,第一阶段(0.65%

Several coalification jump points exists in coal metamorphism, in which alkane gas formed through thermal degradationsubstituted benzene rings. The aromatic carbon ratio changes weakly while the aromatic ring condensation degree shows a trend of increasing- decreasing - increasing. Aliphatic hydrocarbons are dominated by methylene content, and the branching degree parameter has decreased-increased -decreased during the evolution. Coupling with the characterization of carbon isotopes of methane, structural evolution in middle rank coals included five stages. The first stage (0. 65%

山西省基础研究计划自由探索类项目(202203021212475,202203021221230);煤矿安全技术国家重点实验室开放课题基金(sklcmst106);山西省高等学校教学改革创新项目(J20221257,J2021807)

王 路, 赵庆珍, 翟志伟, 等.基于 FTIR 与烷烃气碳同位素特征的中阶煤结构演化研究 [J].煤炭工程,2024, 56(2): 171-177.