为研究有机溶剂萃取对不同煤阶煤生物气的增产效果，采用加速溶剂萃取法（ASE）分别对中阶煤与低阶煤进行预处理，对原煤预处理后所得残煤和萃余物进行微生物成气实验。通过改变ASE的条件参数，讨论不同萃取温度和萃取次数对煤萃取效果的影响，分析了不同煤阶的原煤、萃取残煤和萃余物的生物甲烷的产生途径及增产效果，对原煤、萃取残煤和成气后残煤进行了傅里叶变换红外光谱（FTIR）分析，研究了煤中化学结构和官能团的变化。结果表明：ASE萃取的最佳条件是萃取温度为100 ℃，萃取次数为10次；中阶煤的萃取率为1.06%，低阶煤的萃取率为4.23%。在煤生物产甲烷过程中，第一阶段生成的甲烷主要是二氧化碳氢还原途径产出，而第二阶段产生的甲烷主要由乙酸发酵主导。ASE萃取后，中阶煤的残煤和萃余物的生物甲烷产量分别比原煤提高了38%和210%；低阶煤的残煤和萃余物的生物甲烷产量分别比原煤提高了17%和113%。低阶煤经ASE萃取后所得残煤和萃余物的甲烷产量均大于中阶煤的残煤和萃余物，分别高出了33%和4%。原煤经ASE萃取后部分芳环被打开，碳碳双键和羧基含量增加；萃取残煤经微生物作用后，煤中碳碳双键和羧基含量均减少。不同煤阶煤经萃取后明显提高了微生物的利用效率，增加了生物甲烷产量，该方法可为煤生物甲烷的增效研究提供一种新途径。

In order to study the increasing effect of organic solvent extraction on biogas of different coal rank,the medium rank coal and low rank coal were pretreated by accelerated solvent extraction (ASE). Biogenic gas formation experiments were carried out on raw coal,extracted residual coal,and extracted residue. By changing the condition parameters of ASE,the effects of different extraction temperature and extraction times on the extraction efficiency of coal were discussed. The production way and yield increasing effect of biomethane from raw coal,extracted residual coal and extract residue of different coal rank were analyzed. The analysis of raw coal,extracted residual coal and gas-formed residual coal was carried out by Fourier transform infrared spectroscopy (FTIR). The changes of chemical structure and functional groups in coals were studied. The results showed that the optimum conditions of ASE extraction were that the extraction temperature was 100 ℃ and the extraction times were 10 times. The extraction rate of medium rank coal was 1.06%,and that of low rank coal was 4.23%. In the methane production process of coal biomass,the methane produced in the first stage was mainly the reduction pathway of hydrocarbon dioxide,while the methane produced in the second stage was mainly dominated by acetic acid fermentation. After ASE extraction,the biomethane yield of extracted residual coal and extract residue of middle rank coal was 38% and 210% higher than that of raw coal,respectively. The biomethane yield of extracted residual coal and extract residue of low rank coal was 17% and 113% higher than that of raw coal,respectively. The methane yield of extracted residual coal and extracted residue of low rank coal extracted by ASE was higher than that of medium rank coal,which was increased by 33% and 4%,respectively. After the raw coal was extracted by ASE,some aromatic rings were opened,the contents of carbon-carbon double bonds and carboxyl groups are increased. After the extraction of extracted residual coal by microorganisms,the contents of carbon-carbon double bonds and carboxyl groups in coal decreased. The extraction of different rank coals could obviously improve the utilization efficiency of microorganisms and increase the production of biomethane. This method could provide a new way to study the synergism of coal biomethane.