采用低温预氧化方法在固定床内对平顶山地区强粘结煤进行了降粘实验. 结果表明，该煤种粘结性随氧化时间延长而降低，氧化8 h、终温200℃的样品降粘效果最好，原煤的粘结指数由81下降到3.49. 氧化终温对煤粘结性影响复杂，随氧化时间延长，降粘的最佳温度也随之改变. 13C固体核磁共振对煤样的表征发现预氧化后煤大分子结构中的芳香环趋于稳定，脂肪支链变短，含氧官能团增多. 对接氧脂碳falO、接氧芳碳faP、羰基碳faC、脂肪烃碳falC?H含量与粘结指数GR.I.进行线性拟合，拟合方程分别为falO??0.012GR.I.+5.53, faP??0.013GR.I.+7.03, faC??0.014GR.I.+5.25, falC?H?0.041GR.I.+19.46，其决定系数分别为0.889, 0.722, 0.623, 0.581.

Pre-oxidation decaking experiments with a fixed bed at low temperature were carried out on a kind of strongly caking coal mined from Pingdingshan District. The results showed that longer reaction time could lower coal caking index, but temperature had complex effects on the coal caking properties. While the oxidation temperature was 200℃, the caking index of raw coal decreased from 81 to 3.49 after 8 h. Solid state 13C-NMR characterization indicated that, after oxidation, aliphatic side-chains in macromolecular structure of coal was broken and had a lower content than before, while the content of oxygen functional groups increased and the aromatic structure remained stable. At the same time, content of aliphatic carbon bonded to oxygen falO, content of aromatic carbon bonded to oxygen faP, content of carbonyl carbon faC and aliphatic hydrocarbon carbon falC?H showed a good linear dependence on coal caking index GR.I.. The equations were falO??0.012GR.I.+5.53, faP??0.013GR.I.+7.03, faC??0.014GR.I.+5.25 and falC?H?0.041GR.I.+19.46, and their coefficients of determination were 0.889, 0.722, 0.623 and 0.581, respectively.