【摘要】 采用摄像法,在2维流化床中,研究了孔速、开孔率和颗粒物性对分布板区射流深度、死区高度的影响。结果表明,随着孔速和孔径的增加,射流深度增大,颗粒运动区增大,死区高度减小。在相同的孔速下,多孔分布板的射流深度更大。对于不同的颗粒物料,在相同U/Umf(U为表观气速,Umf为最小流化气速)下,射流深度基本一致。与文献中的射流深度计算公式进行对比,将U/Umf引入分布板区射流深度计算公式,提出了新的射流深度计算公式。对不同条件下分布板区死区高度数据进行拟合,得到了死区高度的经验关联式。更多还原

【Abstract】 The influences of orifice velocity, perforated rate and particles on jet penetration length and dead zone height were investigated in the grid zone of a two-dimensional fluidized bed by photographs and visual analysis. The results showed that with the increase of the orifice velocity and diameter of orifice, the jet penetration length and particle moving zone increased, while the dead zone height decreased. At the same orifice velocity, the more holes the distributor had, the higher the jet penetration length was. And at same U/Umf(U was the superficial gas velocity and Umf was the minimum fluidization velocity), the jet penetration length of different particles were almost the same. The correlations in different literatures were compared and a new correlation of jet penetration length was proposed by including a dimensionless group U/Umf. A correlation of dead zone height was obtained by fitting the data derived under different operating conditions.更多还原