隔板式内循环流化床颗粒循环速率实验与模型

Experimental and model studies on particle circulation rate in internal circulating clapboard-type fluidized bed

在不同操作参数及结构参数下对隔板式内循环流化床的颗粒内循环速率进行了实验研究,研究了高速区和低速区的流化速度、静床层高度、隔板间隙等参数对颗粒内循环流动的影响。结果表明这4个参数对颗粒内循环速率都有显著的影响,当其他3个参数确定时,随着其中一个参数的增加,颗粒内循环速率均呈现先增加后减小的趋势,这一结果表明,颗粒内循环过程是多种操作和结构参数的非线性复杂系统。为预测颗粒内循环速率,修正了La Nauze模型,该模型无须提供压降参数即可计算颗粒内循环速率,对于多种颗粒,其计算结果和实验相差在23%之内。

The influence of fluidization velocity in high and low velocity regions, height of static bed, and clapboard gap on internal flow of particles in internal circulating clapboard-type fluidized bed were experimentally studied by changing operating conditions and structural parameters. The results showed that the particle circulation rate was significantly affected by these four parameters. The particle circulation rate first increased and then decreased with the increase of one parameter while the other three parameters were kept unchanged. Hence, particle circulation is a nonlinear complex system of multiple operational and structural parameters. The La Nazue model was modified to predict the particle circulation rate without providing pressure drop between clapboard gap. The error between the calculated and experimental results for various particles was within 23%.