低温加压热解脱氧对胜利褐煤亲水性的影响

在固定床反应器中考察了低温（200~350 ℃）、加压（0.25~8.00 MPa）热解条件下胜利褐煤主要含氧官能团的变化规律，并进一步分析了褐煤中含氧官能团的脱除对其吸水能力的影响。结果表明，温度升高对胜利褐煤中羧基和酚羟基的脱除非常有效，压力变化对羧基脱除影响极小，而在3.00~4.00 MPa时对酚羟基脱除效果最佳；同时羧基对煤样的表面极性和亲水性具有决定性作用，当羧基含量不变时，固体比表面积对煤样的吸水性影响相对较明显。

Deoxygenation effect on hydrophilicity changes of Shengli lignite during pressurized pyrolysis at low temperature

The effect of temperature (200~350 ℃) and pressure (0.25~8.00 MPa) on the elimination of main oxygen-containing functional groups of Shengli lignite was examined during pyrolysis in a fixed-bed reactor. Effects of the reduction of oxygen-containing functional groups on the moisture holding capacity (MHC) of coal samples were also investigated. The results showed that temperature was the key factor on the removal of carboxyl and phenolic hydroxyl from the lignite. The variation of pressure had few effects on the removal of carboxyl in coal; in contrast, phenolic hydroxyl was reduced to a minimum point at the pressure between 3.00 to 4.00 MPa. The carboxyl content in the lignite played a dominant role on the surface polarity and moisture holding capacity. The influence of specific surface area on the MHC became distinct when the carboxyl content in coal samples kept constant.