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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。
The lignite coal samples were characterized and demonstrated by the isothermal drying, microscopic infrared test, X-ray photoelectron spectroscopy (XPS), thermogravimetry and scanning electron microscopy (SEM) on the lignite produced by Huaneng Zhaolinuoer Coal Company It can be concluded that the lignite drying can be divided into two stages, namely, the stage of upgrading and desiccation and the stage of desiccation and drying. The larger the temperature difference between the surface and the interior of coal particles, the stronger the driving force of particle water diffusion and the larger the effective water diffusion coefficient Is conducive to dry. And lignite should be dried as much as possible in a nitrogen stream, the temperature controlled at 361 ℃, in order to prevent lignite pyrolysis; dry coal surface loses its original smooth and dense structure, a large number of irregular and size groups Therefore, to a certain extent, it will increase the re-adsorption of lignite after drying, which is not conducive to the storage and transportation of post-drying lignite.