【摘要】 研究了高速气流冲击下微细颗粒在流化床中的供料输送特性,利用正交实验考察了气体流量、开孔数、孔径和气孔埋入料层深度对微细颗粒输送特性(输送速度和粉气比)的影响.结果表明,气体流量为1~2.5 m~3/h时,增加气体流量能显著提升微细颗粒的输送速度;孔径越小越有利于提升输送效果,但需注意喷口处气体流速限制;开孔数对微细颗粒的输送特性影响不显著;随气孔埋入料层深度增加,高速气流冲击破碎作用局部强化,输送效果明显提升.孔径2 mm、开孔数1个、气孔埋入料层深度200 mm和气体流量2.5 m~3/h的操作条件下,输送速度可达3.1 g/min,粉气比为0.058 g/g.更多还原

【Abstract】 The entrainment characteristics of fine particles are investigated in a cylindrical fluidized-bed under high speed air flow. The effects of the flow rate of gas, the number of holes, the size of holes, and the distance between holes and the upper surface of the material layer on the entrainment characteristics(entrainment rate and entrained powder-gas ratio) are experimentally studied through orthogonal experiment. The experimental results show that an increase in flow rate of gas and the distance between hole and upper surface of the material layer constantly improves the entrainment characteristics. A decrease in the size of holes enhances such characteristics and improves the entrainment characteristics. Whereas the number of holes has no significant effect on the entrainment characteristics. This study determines that an optimal operating condition can result in optimal entrainment characteristics(W, 3.1 g/min and R, 0.058 g/g), which can be achieved with a flow rate of 2.5 m~3/h, the number of holes of 1, the size of holes of 2 mm and the upper surface of the material layer of 200 mm.更多还原