摘要
在空气-水-玻璃珠三相连续操作环流反应器中,利用动态溶氧方法研究了表观气速(Ug=0.01～0.13m/s)、进料浆速(USL=0.001～0.011m/s)、浆相质量固含率(εs=0～30%,ω)和固相颗粒大小(dp=59,200μm)对环流反应器内氧的液相传质性能的影响.结果表明,在考察范围内,环流反应器传质系数随表观气速增大而增大,受进料浆速变化的影响较小,随浆相固含率增大呈现先增大后减小的趋势,但在高固含率下(εs≥10%,ω)的影响不显著;随固相颗粒粒径增大而减小.同时得到了液相体积传质系数的经验关联式.
Liquid phase oxygen mass transfer characteristics in a three-phase continuous loop reactor were studied by a dynamic oxygen dissolution method with glass beads （dp=59, 200 μ; ps=2460 kg/m^3） as the solid phase, air as the gas phase and tap water as the liquid phase, respectively. Liquid phase oxygen mass transfer coefficient （kLα） was measured in the range of superficial gas velocity （Ug=0.01-0.13 m/s）, superficial slurry feeding velocity （USL=0.001-0.011 m/s）, solid holdup （εs=0-30%, ω） and two different particle diameters. It is found that kLα value increases with increasing superficial velocity, but decreases with increasing particle size. It is also demonstrated that variation of USE has no significant effect on kLα in the range of the investigated operation conditions. And a maximum kLα is found when the solid holdup increases at given Ug and USE, but the effect of solid hold-up is negligibly small when εs is larger than 10%（ω）. Finally, an empirical correlation of kLα is presented for designing such type reactors.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2007年第5期847-852,共6页
The Chinese Journal of Process Engineering
基金
国家重点基础研究发展规划(973)基金资助项目(编号:2004CB217604)
关键词
环流反应器
传质系数
三相床
表观气速
进料浆速
loop reactor
volumetric mass transfer coefficient
three-phase continuous operation
superficial gas velocity
superficial slurry feeding velocity
