【摘要】 用三种不同直径的浆态鼓泡塔研究气速、塔径、固相浓度、静止床层高度和气体分布器等对气含率的影响。平均气含率随气速变化分为稳定区、过渡区和湍流区,得到各区平均气含率的计算式,其平均误差小于5%。用气隙率仪测定了局部气含率和气泡频率的分布并研究了气泡直径、气泡上升速度和气、液相界面积等,并给出了计算式。更多还原

【Abstract】 The variation of gas holdup with gas velocity, column diameter, solid concentration, static bed height and gas distributor was studied in slurry bubble columns with three different diameters. The variation of average gas holdud with gas superficial velocity can be divided into three regions——steady-state region, transition region and turbulence region.The gas holdup for each region can be determined with following equations.the steady-state region U_≤3.0cm/sε₌ 5.075×10^-3F,^0.927G_a^0.602（d/D）^1.463 F_?= 0.0391the transition region 3.0<U_?≤9.0cm/sε₌3.122×10^-4F_?^0.429G_a^0.884（d/D）^0.570 0.0391<F_≤0.06425the turbulence region U_g>9.0cm/sε₌1.567×10^-2F_<sup>0.679G_a^0.353（d/D）^0.782 0.06425<F_r≤0.1955An instrument was established to measure the distribution of local gas holdup and bubble frequancy. The bubble diameter, bubble raising velocity and gas-liquid interfacial area were also studied. The calculating equations are given in this paper.更多还原