潮湿细粒煤脉动流态化脱灰与脱水的过程强化机理

The clean and efficient utilization of fossil energy is the requirement of medium-and-long-term development of science and technology in energy field. Dry beneficiation and upgrading of low-rank coal is hotspots all over the world. Dense-phase fluidized bed can be used for dry beneficiation efficiently for coarse coal. In this project, the hot and active pulsating air flow is introduced into the dense-phase fluidized bed, and a dense-phase gas-vibro separating fluidized bed is generated. The research contents are listed as follows: the kinetics of heavy medium and coal particles, enhancement mechanism of bed stability, mass and heat transfer of multiphase, characteristics and enhancement mechanism of de-ash and de-water in gas-vibro fluidized bed. The bed stability can be improved by the pulsating air flow, and -6mm fine coal can be separated efficiently. The synergistic effect of temperature, concentration, pressure and pulsating air flow can be used to enhance the process of de-ash and de-water. Finally, the fine coal with high moisture can be upgraded using the gas-vibro fluidized bed.

清洁高效的利用煤炭等化石能源是我国能源领域中长期科技发展的要求。煤炭高效干法分选和低阶煤的干燥提质是近年来的研究热点和难点。浓相气固流化床分选技术能够实现块煤的高效干法分选。本项目提出在浓相气固流化床中引入脉动热空气，形成热态的稠密脉动分选流化床，降低有效分选粒度下限，提高传质传热效率。研究脉动流化床中多组分多尺度颗粒动力学及床层稳定强化机理、多相间的传质与传热、潮湿细粒煤脱灰与脱水特性及其过程强化机理等。采用气流振动能量提高床层稳定性，实现-6mm细粒煤的有效分选，通过温度、浓度、压力和气流振动等多驱动势协同作用，解决分选与干燥在竞争中协调的问题，强化潮湿细粒煤脱灰与脱水过程，实现分选与干燥的一体化。