【摘要】 通过对华能扎赉诺尔煤业公司生产的褐煤的恒温干燥、显微红外试验、X射线光电子谱(XPS)、热重及扫描电子显微(SEM)试验,表征和展现了褐煤煤样的基础性能,从而得出褐煤干燥可分为升速干燥提质阶段和降速干燥提质阶段,煤样颗粒表面与内部温差越大,颗粒水分扩散驱动力越强,有效水分扩散系数越大,越有利于干燥的进行。并且褐煤干燥时应尽可能在氮气流中进行,温度控制在361℃内,以防止褐煤热解;干燥后煤样表面失去原有的平整和致密结构,出现大量不规则且大小不等的团块和颗粒,孔隙和裂隙明显增多,因此在一定程度上将会增大干燥后褐煤的复吸现象,不利于后期干燥褐煤的储存、运输。更多还原

【Abstract】 By constant-temperature drying, micro infrared spectrometer(FT-IR), X-ray photoelectron spectroscopy(XPS), thermal gravimetric and scanning electron microscope(SEM) experiment of the lignitefrom Zhalainuoer of Inner Mongolia, the basic performance of the lignite sample was exhibited. It was also concluded: the lignite drying process was divided into rapid drying stage and low-velocity drying stage; the greater the temperature difference between grain surface and interior was, the stronger the grain moisture diffusion driving force was, and the bigger the effective moisture diffusion coeff icient was also, which was conducive to lignite drying. In addition, the drying of lignite should be conducted in nitrogen atmosphere as possible as it could, and the temperature should be controlled within 361 ℃, so as to prevent the lignite from pyrolyzation. The surface of dried lignite was characterized by plenty of irregular and various-sized agglomerates and grains instead of original smooth and dense structure, the porosity and cracks increased remarkably, which would lead to easy reabsorption of dried lignite and was not conducive to subsequent storage and transportation of dried lignite.更多还原