褐煤焦与NaNO3对昭通褐煤微波提质特性研究  

Study on microwave upgrading characteristics of Zhaotong lignite with lignite char and NaNO_3

作　　者：胡林 王光华 何龙 王晴东 马志勇 刘阳 

机构地区：[1]湖北煤转化与新型炭材料重点实验室,武汉科技大学化学与化工学院,湖北武汉430081

出　　处：《化工进展》2017年第12期4423-4429,共7页Chemical Industry and Engineering Progress

摘　　要：通过对昭通褐煤中添加褐煤焦和NaNO_3的微波提质实验,研究褐煤焦与褐煤质量比、NaNO_3质量分数和微波功率对昭通褐煤的微波提质特性的影响行为,用几种常用的薄层干燥模型对实验数据进行拟合,探讨适合褐煤焦和NaNO_3对褐煤微波提质的最佳干燥模型,利用修改Arrhenius方程计算出褐煤干燥过程中的表观活化能。结果表明,随着褐煤焦与褐煤质量比、NaNO_3质量分数和微波功率的增大,褐煤干燥平衡时间减小,而褐煤水分有效扩散系数增大;Page模型最适合描述褐煤焦对褐煤微波提质的影响行为,Henderson and Pabis模型最适合描述NaNO_3对褐煤微波提质的影响行为;用修改Arrhenius方程分别计算褐煤焦与褐煤质量比为0.25∶5的不同微波功率和NaNO_3的质量分数为5.0%的不同微波功率的表观活化能,数值分别为579.44W/g、286.87W/g。Lignite char and NaNO3 were added to microwave upgrading experiments of Zhaotong lignite.The weight ratio of lignite char to lignite,the weight content of NaNO3 and microwave power were investigated.The most fitted drying model to describe the lignite char and NaNO3 on the lignite microwave upgrading were discussed by fitting the several common thin layer drying models with the experimental data.The modified Arrhenius equation was used to calculate the apparent activation energy during the lignite drying process.It was found that the drying equilibrium time decreased and the moisture diffusion coefficient of lignite increased with increasing the weight ratio of lignite char to lignite,NaNO3 weight content and microwave power.The Page model best described the characteristics of the lignite char on the lignite microwave upgrading,while the Henderson and Pabis model was the most suitable one with addition of NaNO3.The apparent activation energy of different microwave power with 0.25∶5 of the weight ratio of lignite char to lignite and 5.0% of weight content of NaNO3 from the modified Arrhenius equation were 579.44 W/g and 286.87 W/g,respectively.

关 键 词：褐煤 微波提质 褐煤焦 硝酸钠 表观活化能 

分 类 号：TQ54[化学工程—煤化学工程]