煤炭低温预氧化降粘实验研究及机理分析  

Experimental Study and Mechanism Analysis of Pre-oxidation Decaking of Coal at Low Temperatures

作　　者：富迎辉 范垂钢[1] 李松庚[1] 宋文立[1] 林伟刚[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]中国科学院大学化学与化工学院,北京100049

出　　处：《过程工程学报》2016年第4期607-614,共8页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金委-神华集团煤炭联合基金资助项目(编号:51174284)

摘　　要：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 fa^P, content of carbonyl carbon fa^C and aliphatic hydrocarbon carbon fal^C-H showed a good linear dependence on coal caking index GR.I.. The equations were fal^O=-0.012 GR.I.＋5.53, fa^P=-0.013 GR.I.＋7.03, fa^C=-0.014 GR.I.＋5.25 and fal^C-H=0.041 GR.I.＋19.46, and their coefficients of determination were 0.889, 0.722, 0.623 and 0.581, respectively.

关 键 词：强粘结性煤 降粘 预氧化 含氧官能团 

分 类 号：TP536.1[自动化与计算机技术]