基于Aspen Plus的褐煤高温烟气和回转管式干燥过程模拟

为了研究高温烟气干燥和回转管式干燥特性,采用Aspen Plus软件对高温烟气干燥和回转管式干燥过程进行流程模拟,并运用能量平衡法和分析方法对2种干燥系统能量利用效率进行分析。结果表明,Aspen Plus能够较好地模拟高温烟气干燥和回转管式干燥过程。烟气和蒸汽温度分别为750和203.1℃时,回转管式干燥的热利用效率为71.27%,较高温烟气干燥高4.04%,而回转管式干燥利用效率为87.68%,较高温烟气干燥高49.33%。随干燥介质温度升高,高温烟气干燥与回转管式干燥热利用效率提高,利用效率降低。

Simulation on high temperature flue gas drying and rotating tube drying processes of lignite using Aspen Plus

In order to study the features of high temperature flue gas drying and rotating tube drying,the two processes were simulated using Aspen Plus.Energy balancing method and exergy analyzing method were employed to analyze the energy utilizing efficiency of these two drying systems.Results show that the Aspen Plus can accurately simulate the high temperature flue gas drying and rotating tube drying processes.When the flue gas temperature is 750 ℃ and the vapor temperature is 203.1 ℃,the heat utilizing efficiency of rotating tube drying is 71.27％,which is 4.04％ higher than the flue gas drying proces,while,the exergy utilizing efficiency of rotating tube drying is 87.68％,which is 49.33％ higher than high temperature flue gas drying.The heat utilizing efficiency of high temperature flue gas drying and rotating tube drying will increase with the rising of temperature of drying medium.On contrast,the exergy utilizing efficiency will decrease with the increase of temperature of drying medium.