褐煤焦与NaNO3对昭通褐煤微波提质特性研究

doi:10.16085/j.issn.1000-6613.2017-0395

化工进展 ›› 2017, Vol. 36 ›› Issue (12): 4423-4429.DOI: 10.16085/j.issn.1000-6613.2017-0395

褐煤焦与NaNO₃对昭通褐煤微波提质特性研究

胡林, 王光华, 何龙, 王晴东, 马志勇, 刘阳

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

收稿日期:2017-03-11 修回日期:2017-04-16 出版日期:2017-12-05 发布日期:2017-12-05
通讯作者: 王光华,教授,博士生导师。
作者简介:胡林(1992-),男,硕士研究生,研究方向为低品质煤的提质利用及其热解气化。E-mail:1820743335@qq.com。

Study on microwave upgrading characteristics of Zhaotong lignite with lignite char and NaNO₃

HU Lin, WANG Guanghua, HE Long, WANG Qingdong, MA Zhiyong, LIU Yang

Hubei Coal Conversion and New Carbon Material Key Laboratory, School of Chemical and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China

Received:2017-03-11 Revised:2017-04-16 Online:2017-12-05 Published:2017-12-05

摘要/Abstract

摘要： 通过对昭通褐煤中添加褐煤焦和NaNO₃的微波提质实验，研究褐煤焦与褐煤质量比、NaNO₃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NaNO₃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、NaNO₃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NaNO₃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NaNO₃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。

关键词: 褐煤, 微波提质, 褐煤焦, 硝酸钠, 表观活化能

Abstract: 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 579.44W/g and 286.87W/g,respectively.

Key words: lignite, microwave upgrading, lignite char, sodium nitrate, apparent activation energy

中图分类号:

TQ54

胡林, 王光华, 何龙, 王晴东, 马志勇, 刘阳. 褐煤焦与NaNO₃对昭通褐煤微波提质特性研究[J]. 化工进展, 2017, 36(12): 4423-4429.

HU Lin, WANG Guanghua, HE Long, WANG Qingdong, MA Zhiyong, LIU Yang. Study on microwave upgrading characteristics of Zhaotong lignite with lignite char and NaNO₃[J]. Chemical Industry and Engineering Progress, 2017, 36(12): 4423-4429.

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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 NaNO₃

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