中文摘要：

研究了四种不同变质程度烟煤及其二硫化碳／N-甲基-2-吡咯烷酮（CS2／NMP）混合溶剂（1：1，vol）的抽提物在不同溶剂中的溶胀性能，同时考察了四种煤样不同温度热处理后其溶胀性能的变化。结果表明，煤的溶胀率随煤化度增加而有所降低；变质程度较低的烟煤在极性溶剂中的溶胀率大于非极性溶剂，随着煤化度的增加，两者溶胀度差距减小；四种烟煤经混合溶剂抽提后，其抽余煤的交联密度降低，溶胀率增加。四种煤样150℃热处理后在CS2中的溶胀率均有所增加，表明热处理可以降低煤的交联密度。随着热处理温度提高至240℃，除气煤外，其余三种煤样在NMP和CS2中溶胀率均进一步增大，说明其交联密度进一步降低。这一结果与热处理煤样在混合溶剂中抽提率的变化趋势一致，如240℃热处理后瘦煤的抽提率由原煤的6．9％提高到17．3％。红外光谱研究表明，经过适当温度的热处理，可以脱除煤分子中的羰基和羟基等含氧官能团，破坏煤结构中的氢键，从而降低煤的交联密度，提高煤的溶胀率及其在混合溶剂中的抽提率。

英文摘要：

The swelling behavior in different solvents of 4 bituminous coals with different ranks and their residues from extraction by CS2/NMP mixed solvent （ 1 ： 1 in volume） were measured. The change in swelling property of the four coals thermally treated at different temperature was observed. The results show that the swelling ratio decreases with increasing rank of coal. For lower rank bituminous coals the swelling ratios in polar solvent are higher than those in non-polar solvent, and this difference decreases with increasing rank. The cross-linking densities of the four residues decrease, and the swelling ratios increase compared with those of raw coals. The swelling ratios of the four thermally treated coals under 150 ℃ in CS2 increase, suggesting,the decrease in cross- linking density of them. When the thermal treatment temperature increases to 240 ℃, the swelling rations of the other three coals in NMP and CS2 increase again except gas coal, demonstrating the further decrease in cross- linking density. This result is coincident with the extraction yield change in the mixed solvent of the thermally treated coal. For example, the extraction yield of lean coal treated at 240 ℃ increases from 6.9% to 17.3%. FT-IR results show the removal of oxygen group of the thermally treated coals. This may explain the increase in swelling ratio and extraction yield in the mixed solvent of coal after thermal treatment. The cross-linking density of the thermally treated coal decreases because of the break of hydrogen bonds due to removal of C = O and -OH oxygen groups during the thermal treatment, resulting in the increases of swelling ratio and extraction yield in the mixed solvent of thermally treated coal compared with those of raw coal.