关键词: 油页岩, 干燥机理, 热风干燥

Abstract: Yaojie oil shale particles were taken as sample to determine water content and drying rate with electric heating box，electronic balance and infrared temperature measuring instrument. The drying mechanism in each section was discussed，and the effect of temperature，particle size on oil shale drying was analyzed. On the drying rate curve，an inflection point existed obviously，which suggested that the drying process was divided into two stages. When water content was higher than the one of the inflection point，the main process is the removal of free water and bound water in large pores accompanied with shrinkage. According to the Kelvin equation，this process was influenced by the capillary effect，which reduced the evaporation rate gradually. When water content was less than the one of the inflection point，water in the smaller pores was heated，water molecular escaped when its kinetic energy reached a certain level，causing the decrease of moisture content and thermal breakage during the later period of oil shale drying.

Key words: oil shale, drying mechanism, hot air drying