关键词: 环流反应器, 内构件模拟优化, 导流筒, Fluent, 气液分离区

Abstract: The influence of internals on 78.5L airlift loop reactor was studied and optimal values were obtained for theoretical guidance of industrial equipment. Fluent software was used to establish a mathematical model to compare with experiment result. The influence of height ratio between gas liquid separation zone and external tube, length ratio between diversion tube and external tube, and diameter ratio between diversion tube and external tube on flow behavior of airlift loop reactor was investigated. The error between simulation and experiment results was small, and the mathematical model could be used to predict flow behavior of airlift loop reactor. Circulation resistance became larger when length ratio between gas liquid separation zone and external tube was too large. Reactor flow achieved the best performance when the ratio was 0.34-0.36. Increasing length ratio between diversion tube and external tube could increase gas holdup and liquid circulation rate, but an overly large ratio would cause bubbles coalescence, which would affect flow performance. Reactor flow achieved the best performance when the ratio was 0.60-0.62. Increasing diameter ratio between diversion tube and external tube could improve flow. Loop resistance was larger when ring gap area was too small and reactor flow achieved the best performance when diameter ratio was 0.73-0.77.

Key words: loop reactor, internals simulation optimization, diversion tube, Fluent, gas liquid separation zone