摘要
利用热天平研究了4种不同煤样在不同升温速率下的非等温干燥特性,借助干燥动力学分析方法拟合4个煤样非等温干燥数据,对比计算31种不同动力学模型对4种不同煤样干燥机理方程的适应性,并给出详细的计算过程,最后确定4种煤样最适宜的非等温干燥模型为三维扩散模型。在选定最佳干燥模型的基础上进行动力学计算和分析,结果表明:对于CZ(潮州)、DF(大方)和HY(河源)煤样,同一温度不同升温速率的干燥速率常数大小顺序为K_(20)>K_(30)>K_(10)(K_(20)、K_(30)、K_(10)分别为升温速率为20、30和10℃/min时煤样的干燥速率常数),对于TS(台山)煤样同一温度不同升温速率的干燥速率常数大小顺序为K_(20)>K_(10)>K_(30)。4种不同煤种在20℃/min的升温速率下的干燥速率常数基本都最大,在实际干燥过程中可采取20℃/min为最佳的干燥升温速率。
The non-isothermal drying characteristics of four different coal samples under different heating rates were conducted by thermal gravimetric analyzer. Non isothermal drying data of four different coal samples was fitted according to drying kinetics analysis. The most appropriate non-isothermal drying model was selected as three-dimensional diffusion model after comparing the adaptabilities of thirty-one different dynamic models to the drying mechanism of four different coal samples tested( the detailed calculations were provided in this paper). Based on the optimal drying model,the dynamic calculation and analysis were carried out. The results showed that the drying rate order of different heating rates at the same temperature is K_20> K_30> K_10 for CZ,DF and HY coals,but it is K_20> K_10> K_30 for TS coal. Since the drying rate at 20 ℃/min is the maximum for all the four different coals,20 ℃/min can be selectedas the optimal dry heating rate
出处
《热能动力工程》
CAS
CSCD
北大核心
2017年第2期81-87,共7页
Journal of Engineering for Thermal Energy and Power
基金
中央高校基本科研业务费专项基金资助项目(10MG19)
关键词
热重分析
非等温干燥
动力学
机理方程
活化能
thermal gravimetric analyzer
non-isothermal drying
kinetics
mechanism equations
activation energy
