摘要
以CFD数值模拟为基础,从功耗性能和体积传氧性能两方面,对自吸式三相搅拌釜中流动与传质特性进行实验研究。实验表明,当搅拌转速低于气体吸入临界转速时,其对搅拌功率的影响很小,当转速高于气体吸入临界转速时,随着固相分率的增大搅拌功率下降。当固相分率φ<5%时,固相颗粒的存在使得体积传氧系数KLa增大,当固相分率φ>5%时,固相颗粒的存在使得KLa降低。单位体积功耗Pg/V越大,KLa越大,同样的单位体积功耗下,自吸式三相搅拌釜的KLa比搅标准搅拌釜高。
The paper studies flow and mass transfer characteristics of self-suction three-phase stirred tank from two aspects of power performance and the volume oxygen transfer capability, based on the Computational Fluid Dynamics numerical simulation. Experiments show that, when the stirring speed is lower than the critical speed of gas inhalation, its influence on the stirring power is very small; when the speed is higher than the gas suction critical speed, the stirring power decreases with the solid fraction increasing. When the solid fraction φ〈5 %, solid particles make the volumetric oxygen transfer coefficient Kta increase, when the solid fraction φ〉 5 %, solid particles make KLa reduce. Unit volume power Pg/V is more, KLa is more. With the same Pg/V, KLa of self-suction three-phase stirred tank is higher than standard stirred tank.
出处
《广东化工》
CAS
2014年第24期13-15,共3页
Guangdong Chemical Industry
基金
陕西省科技厅工业攻关项目资助(2011K10-21)
陕西省教育厅专项基金(11JK0619)
关键词
自吸式三相搅拌釜
功耗性能
传氧性能
自吸分散
self suction three-phase stirred tank
power performance
oxygen transfer capability
self suction dispersion
