EXPERIMENTAL AND MODELING INVESTIGATION OF LIGNITE DRYING IN A FLUIDIZED BED DRYER

摘要：

The nitrogen as drying medium and the fluidized bed were used to study the drying characteristics of two kinds of lignite. The results show that the drying process of the lignite could be divided into three stages: a pre-heating period, a constant heating period, and a quick-down heating period. For the same lignite sample, the drying rate of lignite samples increases with rising drying temperature or flow rate of drying medium. For the different lignite samples, the composition structure of lignite and the modes of occurrence of moisture in the lignite influence the drying characteristics of lignite, besides drying medium temperature and flow rate influence lignite drying. According to the heat transfer rule equation of wet-ball in the forced flow, the drying rate formula of lignite particle in the fluidized bed has been got based on the heat transfer theory and mass transfer theory, and the formula can well interpret the effect of the experimental parameters on the lignite drying.

关键词： lignite fluidized bed drying rate drying model

作者: K.Zhang C.F.You

作者单位: Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Ther Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of The

会议类型: 国际会议

会议名称: 第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)

会议地点: 西安

会议语种:英文

页码: 361-366

在线出版日期: 2009-05-18（万方平台首次上网日期，不代表论文的发表时间）