生物质双循环流化床质量循环流率冷态实验研究

Research on recycling mass flux in biomass dual circulating fluidized bed

基于生物质双循环流化床气化冷态实验,分析了静床床高、鼓泡床物料堆积高度、快速流化床一次流化风速、下返料器风速、物料粒径对生物质气化设备稳定运行的关键因素质量循环流率的影响。实验结果表明:不同运行条件对物料质量循环流率均产生较大影响。质量循环流率随静床床高增加而增大,达到一定高度后增幅明显;随鼓泡床物料堆积高度增加而减小;随快速流化床一次流化风速和下返料风速增加而增大,当料层高度较低时,两床压差波动较大,物料循环不稳定;通过对比两种不同粒径的质量循环流率发现,物料粒径越小,受气固扰动越剧烈,质量循环流率增幅加倍。

The effects of static bed height, bubble column layer height, fluidized air velocity and particle size on recycling mass flux in biomass dual circulating fluidized bed was studied. The influence of recycling mass flux is great in different operating conditions. The recycling mass flux increases with static bed height, and the increasing amplitude is significant to a certain height. The recycling mass flux decreases with bubble column layer height, and increases with fluidized air velocity and particle size. The circulation is unstable when layer height is low, and the recycling mass flux of small diameter is nearly doubled.