摘要
煤气化细渣的高持水性严重影响了其资源化利用。本文通过研究煤气化细渣的表观形貌(SEM)、主要元素分布(EDS)和孔隙结构(BET),明确了其持水性强(64.64%)的根本原因。通过不同温度下的恒温干燥实验,研究了煤气化细渣恒温干燥过程中的干燥动力学,构建了各干燥温度下的Logarithmic恒温干燥动力学模型。干燥温度从80~120℃,样品恒温干燥过程中的等效水分扩散系数De值介于0.0025~0.0048。温度越高,De值越大,水分越容易从颗粒内部扩散到外部,干燥越易进行。
The high-water holding capacity of coal gasification fine slag seriously affects its resource utilization.In this paper,the basic reason of the high-water holding capacity(up to 64.64%)of coal gasification fine slag was clarified by studying the apparent morphology with SEM,the distribution of main elements with EDS and pore structure with BET.Subsequently,through constant temperature drying experiments at different temperatures,the drying kinetics of coal gasification fine slag in constant temperature drying process was studied,and the logarithmic constant temperature drying kinetic model at various drying temperatures was established.Additionally,the drying temperature is from 80 to 120℃,and the equivalent moisture diffusion coefficient D_(e) of the sample during constant temperature drying is between 0.0025 and 0.0048.The higher the temperature,the greater the D_(e)value,the easier the moisture diffuses from the inside of the particles to the outside,and the easier the drying.
作者
涂亚楠
刘定桦
王仪蓉
彭百勤
何浩
闫昱洁
王伟
林祥辉
TU Yanan;LIU Dinghua;WANG Yirong;PENG Baiqin;HE Hao;YAN Yujie;WANG Wei;LIN Xianghui(School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Suzhou Sinoma Design and Research Institute of Non-metallic Minerals Industrial Co.,Ltd.,Suzhou 215151,China;National Research Center for Deep Processing of Non-metallic Minerals,Suzhou 215151,China)
出处
《煤炭工程》
北大核心
2023年第7期158-164,共7页
Coal Engineering
基金
国家自然科学基金面上项目(51974325)
中国矿业大学(北京)大学生创新训练项目(202103034)。
关键词
煤气化细渣
恒温干燥
干燥动力学
扩散系数
coal gasification fine slag
constant temperature drying
drying kinetics
diffusion coefficient
