摘要
以工业笼式聚酯终缩聚反应器开发应用研究为背景,分别考察了介质的粘度、装料液位、转速和反应的结构对笼式反应器的流型及宏观混合时间的影响。实验表明:高粘度、高剪切和小的网盘间距有利于混合;液位增高,不利于混合;在流型上,笼体和网盘相互消除对方的搅拌死区,大大地提高了反应器的混合效率。
The cage-like finishers have been widely used as final polycondensation reactors in polyester industry. However its fundamental aspects of fluid mechanics, mixing characteristics and mass transfer have been hardly studied in the literature. Based on the background of the research and development of the finishers, the mixing characteristics in cage-like finishers were investigated by cold experiments. Because of the complexity of the cage-like reactor structure and the drastic increase in viscosity along the length of the reactor with the degree of polymerization increasing continuously, the researches of cage body and disk-type screens were carried out individually at first, and then the mixing characteristies of the cage-like reactor composed by these two parts were studied. A variety of effects of the parameters such as fluid viscosity, the rotary speed, feed height, structure of reactor, etc, on flow pattern and macro-mixing times was investigated. The results showed that the rotating cage body made the bulk rotates, a strong shear zone was formed in the bottom of the reactor, and the flow pattern produced by the rotating disk-type screens was similar to that produced by disc-ring reactor. When the cage or disk-type screens rotated alone, good mixing cannot be obtained; but in the composite cage-like reactor, very good mixing will be gotten since the addition of the flow pattern producing by the cage and screens will eliminate the dead zone of each other. Results also showed that high viscosity, high shear and low feed height were advantageous to the mixing in the cage-like reactor.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2002年第1期7-12,共6页
Journal of Chemical Engineering of Chinese Universities
基金
高等学校重点实验室访问学者基金资助
