气固流化床内锂颗粒停留时间影响因素研究

为提高锂精渣颗粒在气固流化床中的燃烧效率及延长颗粒的停留时间,基于CPFD理论详细研究了气流速度、质量流和压力等对颗粒在流化床中停留时间的影响,并分析锂精渣颗粒在流化床提升管内轴向高度颗粒浓度的分布情况。结果表明,在质量流一定的情况下可以通过增加气流速度来提高颗粒的停留时间;在相同气流速度下可以通过降低质量流来提高颗粒停留时间;进气压力对颗粒的停留时间影响很小;通过提高气流速度可以显著提高颗粒在密相区的停留时间。

Study on Factors Influencing Residence Time of Lithium Particles in Gas-Solid Fluidized Bed

In order to improve combustion efficiency of particles of lithium refined slag and prolong residence time of particles in fluidized bed, influence of gas velocity, mass flow and pressure on residence time of particles in fluidized bed were studied based on CPFD theory. Distribution of high solid content of particles in axial direction of lift pipe of fluidized bed was analyzed. The results show that residence time of particles can be prolonged by raising gas velocity under constant mass flow or reducing mass flow at the same gas velocity. Inlet pressure has little effect on residence time of particles. Gas velocity can significantly prolong residence time of particles in dense phase zone.