杨亚利,王志超,杨忠灿,姚伟,方立军
YANG Yali,WANG Zhichao,YANG Zhongcan,YAO Wei,FANG Lijun

• 1:西安热工研究院有限公司
• 2:华北电力大学能源动力与机械工程学院

摘要(Abstract)：

为研究褐煤干燥过程,利用煤质水分分析仪和微分热重分析方法,对不同粒级的褐煤在不同干燥温度下进行等温干燥试验,得到了样品含水率与干燥时间、干燥速率与含水率的关系曲线。通过粒级分布系数对褐煤进行含水率折算,并用不同干燥模型对试验数据进行拟合,得到了在介质温度140℃下3个干燥阶段的干燥方程及干燥动力学参数。结果表明,引入粒级分布系数得到的干燥速率特征常数k值,与不同粒级的干燥速率特征常数k的均值相近。根据褐煤的干燥速率和水分的存在形式,将褐煤干燥过程分为3个干燥阶段,分析得出干燥方程模型分别用线性干燥模型、Wang经验模型、Page模型较为合理。根据Arrhenius经验公式建立了ln k与1/T的关系,得到褐煤干燥的界面蒸发活化能Ea=17.088 k J/mol,指前因子A=12.47 min~(-1)。
For the research of lignite drying process,using the water quality analyzer and differential thermogravimetric analysis method,isothermal drying experiments were carried out on lignite with different grain sizes at different drying temperatures. The curves of moisture content and drying time and the curve of drying rate and water content were obtained.The moisture content conversion of lignite with different particle sizes was made by the size distribution coefficient,and the experimental data were fitted with different drying models.The drying equation and the kinetic parameters of the three drying stages were obtained at the medium temperature of 140 ℃.The results showed that the drying rate characteristics constant k,which was obtained by introducing the particle size distribution coefficient,was similar to that of the drying rate characteristic constant k with different particle sizes.According to the drying rate and moisture content of lignite,the drying process was divided into three stages.The drying equation model was obtained by using linear drying model,Wang empirical model and Page model respectively.According to the empirical formula of Arrhenius,the relationship between ln k and 1/T was established,and the activation energy of Eawas 17.088 k J/mol and the pre exponential factor A was 12.47 min~(-1).

关键词(KeyWords)： 褐煤;干燥速率;含水率;动力学
lignite;drying rate;moisture content;kinetics

Abstract:

Keywords:

基金项目(Foundation): 中国华能集团公司总部科技资助项目(HNKJ15-H11)

作者(Author): 杨亚利,王志超,杨忠灿,姚伟,方立军
YANG Yali,WANG Zhichao,YANG Zhongcan,YAO Wei,FANG Lijun

DOI: 10.13226/j.issn.1006-6772.2017.01.004

参考文献(References)：

• [1]Muthusamy Karthikeyan,Wu Zhonghua,Arun S Mujumdar.Lowrank coal drying technologies current status and new developments[J].Drying Technology,2009,27(3):403-415.
• [2]赵卫东,刘建忠,周俊虎,等.褐煤等温脱水热重分析[J].中国电机工程学报,2009,29(14):74-79.Zhao Weidong,Liu Jianzhong,Zhou Junhu,et al.Investigation on the isothermal dewatering of brown coal by thermo balance[J].Proceedings of the Chinese Society for Electrical Engineering,2009,29(14):74-79.
• [3]Norinaga K,Kumagai H,Hayashi J,et al.Classification of water sorbed in coal on the basis of congelation characteristics[J].Energy&Fuels,1998,12(3):574-579.
• [4]Wang H H.Kinetic analysis of dehydration of a bituminous coal using the TGA technique[J].Energy&Fuels,2007,21(6):3070-3075.
• [5]Yu J L,Tahmasebi A,Han Y N,et al.A review on water in low rank coals:the existence,interaction with coal structure and effects on coal utilization[J].Fuel Processing Technology,2013,106(2):9-20.
• [6]Prat M.On the influence of pore shape,contact angle and film flows on drying of capillary porous media[J].International Journal of Heat and Mass Transfer,2007,50(7/8):1455-1468.
• [7]赵虹,郭飞,杨建国.印尼褐煤的吸附特性及脱水研究[J].煤炭学报,2008,33(7):799-802.Zhao Hong,Guo Fe,Yang Jianguo.Adsorption characteristic of Indonesia lignite and dewater experiment[J].Journal of China Coal Society,2008,33(7):799-802.
• [8]Omid M,Baharlooei A,Ahmadi H.Modeling drying kineties of pistaehio nuts with multilayer feed-forward neural network[J].Drying&Technology,2009,27(10):1069-1077.
• [9]应巧玲,励建荣,傅玉颖,等.食品薄层干燥技术的研究进展[J].中国粮油学报,2010,25(5):115-119,128.Ying Qiaoling,Li Jianrong,Fu Yuying,et al.Research progress of thin layer drying technology for food[J].Journal of the Chinese Cereals and Oils Association,2010,25(5):115-119,128.
• [10]王涛.褐煤的脱水提质及干燥/热分解动力学研究[D].大连:大连理工大学,2011:42-55.
• [11]刘辉,吴少华,孙锐,等.快速热解褐煤焦的比表面积及孔隙结构[J].中国电机工程学报,2005,25(12):86-90.Liu Hui,Wu Shaohua,Sun Rui,et al.Specific area and pore structure of lignite char under the condition of fast pyrolysis[J].Proceedings of the Chinese Society for Electrical Engineering,2005,25(12):86-90.
• [12]沈望俊,刘建忠,虞育杰,等.锡盟褐煤干燥和重吸收特性的实验研究[J].中国电机工程学报,2013,33(17):64-70.Shen Wangjun,Liu Jianzhong,Yu Yujie,et al.Experimental study on drying and reabsorption of the lignite of Ximeng[J].Proceedings of the Chinese Society for Electrical Engineering,2013,17:64-70.
• [13]杨晓毓,姜英,邵徇,等.低温干燥对褐煤含氧基团及其吸水性能的影响[J].煤炭转化,2015,38(2):10-13.Yang Xiaoyu,Jiang Ying,Shao Xun,et al.Effects of low temperature drying on the oxygen content and water absorption properties of lignite[J].Coal Conversion,2015,38(2):10-13.
• [14]熊程程,向飞,吕清刚,等.褐煤干燥特性的实验研究[J].化学工程,2011,39(8):74-78.Xiong Chengcheng,Xiang Fei,Lyu Qinggang,et al.Experimental study on drying characteristics of lignite[J].Chemical Engineering,2011,39(8):74-78.