摘要
在一冷态循环流化床实验装置上,考察了一定颗粒原始存料量下,流化风速和回料风量对物料在循环系统中的分布和循环流率的影响。实验结果表明,当固定回料风量时,系统颗粒循环量随着流化风速的增加先增加后有所减少。流化风速较高时,系统将离开了传统的快速床操作区。为在高风速下保持和提高颗粒循环流率,需要进一步提高回料阀的输送能力。当固定流化风速时,回料阀松动风的增加将提高系统颗粒循环流率;但随着料封高度的降低,回料阀向提升管输送的颗粒量趋于稳定。过高的松动风量将破坏正常的料封,这对实际操作是不利的。
A experimental research has been made on a circulating fluidized bed （CFB） cold model. It evaluates the effects of air superficial velocity and air flow rate in the loop seal valve on the characteristics of solid distribution and circulation rate of the CFB. The experimental results show that in the CFB with constant solid inventory, when air superficial velocity Uo increases, the solid circulation rate raises in the beginning but decreases at high velocity then. And high superficial velocity will make the CFB work in a non- fast- fluidization regime. At high superficial velocity, in order to make the system work in a normal fast- lluidization regime, the loop - seal valve is required to supply more air to transport more solids into the bed. When the superficial velocity keeps constant, more air in loop - seal would raise the solid circulation rate but it can not increase more when the solid- seal height decreases to a low value. And much more air in the loop seal valve would destroy the solids - seal and make the moving solids flow fluidized.
出处
《节能技术》
CAS
2008年第4期291-294,共4页
Energy Conservation Technology
基金
国家科技支撑计划资助项目(2006BAA03B01-07)
关键词
循环流化床
物料分布
颗粒循环流率
cireulating lluidized bed
solid distribution
solid circulation rate
