煤结构演化与生气过程关系研究

发布时间：2018-06-12 02:35

本文选题：煤化学结构 + 傅里叶红外技术　；参考：《天然气地球科学》2017年06期

【摘要】：利用傅里叶红外光谱分析技术对煤化程度(R_O)范围为0.35%~5.32%的19个煤样进行了结构分析。分析结果表明:随着R_O值的增加,煤结构中不同的官能团具有不同的演化规律。芳环结构中C-H键在红外谱图中先增加,当R_O3.0%后逐渐减小。含氧侧链与脂肪族侧链随着R_O值增加,吸收峰强度总体呈减弱的趋势。含氧官能团的含量在逐渐的减少,R_O2.5%时,煤结构中基本不再含有含氧侧链;脂肪族侧链R_O2.0%时,脂肪侧链随着煤化程度的增加快速减少,R_O2.0%时脂肪族侧链在煤结构中缓慢减少,当R_O2.5%时,在煤结构中检测到的脂肪侧链已经很少。煤结构的上述演化规律预示着煤在不同的演化阶段具有不同的生气特征。R_O0.8%含氧侧链在煤结构的快速减少说明CO_2气的生成主要发生在相对低的演化阶段;脂肪侧链两段式的演化规律说明煤的主要生气(烃类气体)阶段发生在R_O2.0%,而煤生气结束的煤化程度界限为R_O5.0%。煤在石墨化过程中从芳环上脱落的氢与煤在演化阶段生成的CO_2之间发生的费—托反应可能是过成熟阶段煤成气碳同位素倒转(反转)的一个重要因素。
[Abstract]:The structure of 19 coal samples with a range of 0.35% and 5.32% was analyzed by Fourier transform infrared spectroscopy (FTIR). The results show that with the increase of RO value, different functional groups in coal structure have different evolution laws. The C-H bond in the aromatic ring structure increases first in the IR spectra and decreases gradually when the R _ S _ (O) is 3.0%. With the increase of RO value, the absorption peak intensity of oxygen and aliphatic side chains decreased. When the content of oxygen functional groups gradually decreases by 2.5%, there is basically no oxygen-containing side chain in the coal structure; when the fat side chain RO 2.0%, the fat side chain decreases rapidly with the increase of coalification degree, and the fat side chain decreases slowly in the coal structure when RO 2.0%. The fat side chains detected in the coal structure have been very few by the time of RV 2.5%. The above evolution law of coal structure indicates that coal has different gas generation characteristics in different evolution stages. The rapid reduction of oxygen content side chain in coal structure indicates that the generation of CO _ 2 gas mainly occurs in the relatively low evolution stage. The two-segment evolution of the fat side chain shows that the main gas generation (hydrocarbon gas) stage of coal occurs at Ro 2.0, and the coalification level at the end of coal gas generation is Ro 5.0. The Fischer-Tropsch reaction between the hydrogen falling off the aromatic ring of coal during graphitization and the COSP _ 2 generated by the coal in the evolution stage may be an important factor in the inversion (inversion) of the carbon isotopes of coal-formed gas in the over-mature stage.
【作者单位】：中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;中国矿业大学(北京)地球科学与测绘工程学院;中国石油勘探开发研究院;
【基金】：国家自然科学基金项目(编号:41673047;41572125) 国家科技重大专项(编号:2016ZX05007-003)联合资助
【分类号】：P618.1

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