关键词: 褐煤干燥, 含水率, 干燥动力学, Page模型

Abstract: Lignite has wide size distribution, diverse composition, variable initial moisture content and complex drying characteristics. The effects of particle size, density，initial moisture content and temperature on the drying characteristics of lignite were investigated. The variation of moisture content of lignite with drying time was obtained. Based on the experimental data, the drying equation of lignite was established. The results show that lignite experiences two stages: fast drying and slow drying. The drying rate increases with the increase of particle density and temperature, and decreases with the increase of particle size and initial moisture content. The optimum drying kinetics model of lignite is Page model. Model constants have empirical relationships with particle size, density, initial moisture content and temperature. The equation can well predict the dynamic moisture content of lignite during drying process.