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内蒙古扎赉诺尔褐煤低温热处理提质研究

ISSN号：1001-3954
期刊名称：矿山机械
时间：2014.3.10
页码：5-9
分类：TD528.1[矿业工程—矿山机电]
作者机构：[1]中国矿业大学化工学院江苏徐州221116, [2]中国矿业大学安全工程学院江苏徐州221116
相关基金：基金项目：国家自然科学基金资助项目（51174203,51134022）;国家重点基础研究发展计划（“973”计划）项目（2012CB214904）;国家自然科学基金委员会创新研究群体科学基金项目（50921002）;中央高校基本科研业务费专项资金资助（2013Dxs02）.
相关项目：次生布风层对分选流化床稳定性的协同作用

关键词：褐煤, 恒温干燥, 红外分析, 热重试验, XPS, lignite, constant-temperature drying, infrared analysis, thermal gravimetric experiment, XPS

中文摘要：

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。

英文摘要：

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 coefficient 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.

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