为提高低阶煤利用率，以H2O2为氧化剂对褐煤进行水热氧化实验。利用傅里叶红外光谱(FTIR)仪和拉曼光谱(Raman)仪分析水热氧化温度在100~300 ℃时H2O2对褐煤理化结构的影响。结果表明：100 ℃水热氧化过程中，羧基、芳香醚和酚羟基被脱除，形成脂肪族醚和羟基，芳香族和脂肪族结构被破坏，芳香烃四、五取代被氧化，无定型碳和芳香烃二、三取代质量分数上升，煤样成熟度提高；水热氧化温度升高至150 ℃，褐煤中脂肪族继续被破坏，小分子芳香结构发生沉积，羧基和共轭C=O结构增加，交联结构大量生成，煤质提高；水热氧化温度提高至300 ℃，褐煤中羧基、酯和共轭C=O结构减少，脂肪族大量生成，小分子芳香烃被氧化，煤质降低。

In order to improve the utilization rate of lowrank coal,this paper takes lignite as the research object,and conducts lignite hydrothermal oxidation (H2O2 as oxidant) experiment with H2O2 as oxidant.Fourier infrared spectroscopy (FTIR) and Raman spectroscopy (Raman) were used to explore analyze the effect of H2O2 on the physical and chemical structure of lignite at a hydrothermal oxidation temperature of 100~300 ℃.The results show that during the hydrothermal oxidation process at 100 ℃,carboxyl groups,aromatic ethers and phenolic hydroxyl groups are removed to form aliphatic ethers and hydroxyl groups,aromatic and aliphatic structures are destroyed,the four and five substitutions of aromatic hydrocarbons are oxidized,and amorphous carbon and the content of disubstituted and trisubstituted aromatic hydrocarbons increased,and the maturity of coal samples increased;The hydrothermal oxidation temperature increased to 150 ℃,the aliphatic group in the lignite continued to be destroyed,the aromatic structure of small molecules was deposited,and the content of carboxyl groups and conjugated C=O structures increased.A large amount of crosslinked structure is generated,coal quality is improved;hydrothermal oxidation is increased to 300 ℃,carboxyl,ester,and conjugated C=O structure in lignite are greatly reduced,aliphatic structures are generated in large quantities,small molecular aromatic hydrocarbons are oxidized,and coal quality is reduced.

TK6

吉林省产业技术研究与开发专项项目(2019C056-3)