铁矿石生物质流态化焙烧过程中物料临界流化特性研究

Study of Critical Fluidization Characteristics of Materials during Fluidized Roasting of Iron Ore Using Biomass

生物质流态化焙烧是一种处理难选铁矿石的清洁高效技术。然而,由于生物质与矿石密度差异较大,气固流化特性是生物质流态化焙烧的核心。针对生物质流态化焙烧的临界流化特性进行了研究,结果表明:颗粒临界流化风速随着秸秆颗粒粒度与矿石颗粒粒度的增大而增大,随着生物质质量分数增大而减小,而床层高度与床层面积对临界流化风速影响较小,建立了临界流化风速预测模型。研究结果对生物质流态化焙烧过程调控和新装备研发具有指导意义。

Fluidized roasting of biomass is a clean and efficient technology for the treatment of difficult iron ores.However,due to the large difference in density between biomass and ore,the gas-solid fluidization characteristics are central to fluidized roasting of biomass.The results show that the critical fluidization wind speed of particles increases with increasing straw particle size and ore particle size,and decreases with increasing biomass mass distribution,while the bed height and bed area have less influence on the critical fluidization wind speed,completing an extended study of fluidization roasting of biomass and deriving the critical fluidization wind speed according to different conditions.The study verified the synergistic effect of strawbased biomass particles and hematite particles in the roaster reactor,which has important theoretical and practical implications for the advancement of fluidized roasting of biomass.