超微粉体浆料惰性粒子流化床干燥过程传热传质特性

Heat and Mass Transfer for Submicron Powder Slurry in an Inertial Particle Fluidized Bed Dryer

结合超微钛白粉和磁记录用钡铁氧体磁粉制备中粘性悬浮液混合浆料的脱水干燥过程,研究了在直径为145 mm的惰性粒子流化床中对悬浮液浆料进行脱水干燥的热量和质量传递的基本规律, 所得结果可为工程设计的操作参数选择提供依据, 对其他类似的超微粉体浆料的脱水干燥有参考价值.

Based on the experiments of drying submicron powder suspension slurry in an inertial particle fluidized bed dryer, a mathematical model was established to assess heat and mass transfer rates. The analytical results showed that the heat transfer between the gas stream and inertial particles in the dryer is characteristic of external transport control, but the mass transfer is more complicated in mechanism, and leads to data scattering. The drying capacity per bed volume generally is more than 700 kg/(m3·h) (water), even up to 1 100 kg/(m3·h) (water). These results are useful for selecting correct operating parameters in practical dryer design.