褐煤干燥特性研究

流化床干燥褐煤具有快速干燥脱水特性,对于內蒙古褐煤煤样,当干燥温度小于200℃时,去除煤样外在水分达到煤样临界干基湿含量所用的最短时间为8 min。而当干燥介质温度大于220℃时,干燥速度加快,达到煤样临界干基湿含量的时间缩短到5 min。干燥脱水特性方程,符合单项扩散模型,其干燥规律与干燥介质温度和风速有密切关系。 Fluidized bed drying lignite has fast drying dehydration characteristic.For Mongolia lignite,while the drying temperature is below 200℃,it costs at least 8 minutes to reach the condition that the water content of coal is close to critical dry water content by removing external water of coal.While the drying temperature is higher than 220 ℃,drying rate has been speeded up,the time is reduced to 8 minutes.Dehydration characteristic equation accord with single diffusion model,there is close relation to drying law and drying medium temperature and wind speed