摘要
在修正的Elizarov蒸馏过程数学模型基础上,对薄膜蒸发器内苯—甲苯二元物系的蒸馏过程进行数值模拟,获得液膜内流体的温度和浓度分布,并进一步就蒸馏过程的工艺、结构参数对液膜内流体各种场分布的影响进行探讨。结果表明:降低进料量、增大刮板转速、提高进料温度、热壁温度、减少初始苯含量及增加刮板数均能提高蒸馏分离效果。针对各工艺参数和结构参数对薄膜蒸发器内蒸馏过程的影响进行两水平全析因分析,结果表明:热壁温度、进料量、初始苯含量及刮板转速是影响蒸馏过程的主要因素。此外,上述参数之间存在交互作用。
Based on the modified mathematical model of distillation process presented by Elizarov numerical simulation of the distillation process for benzene - toluene system in thin-film evaporator, the distribution of the temperature and concentration of the liquid in the film was obtained. The effect of operation and structure parameters, which influence the distillation process on temperature and concentration field, was investigated furthermore. The results show that the distillation separation effect can be enhanced by decreasing the feed rate, inlet benzene content, increasing the rotor speed, inlet temperature, temperature of heated wall and blade number. The influence of the operation and structure parameters on the distillation process was investigated using analysis of an experiment with two-level factors. The results show that temperature of heated wall, feed rate, inlet benzene content and rotor speed are most important factors which influence the distillation process. In addition, there exist in- teractions between the above parameters.
出处
《食品与机械》
CSCD
北大核心
2009年第2期93-98,共6页
Food and Machinery
关键词
薄膜蒸发器
蒸馏
数值模拟
析因分析
Thin-film evaporator
Distillation
Numerical simulation
Factorial analysis
